{"id":6180,"date":"2026-07-05T01:30:19","date_gmt":"2026-07-05T09:30:19","guid":{"rendered":"https:\/\/changyupump.com\/?p=6180"},"modified":"2026-07-05T01:32:56","modified_gmt":"2026-07-05T09:32:56","slug":"tio%e2%82%82-slurry-pump-acid-resistant-transfer-for-chemical-processing","status":"publish","type":"post","link":"https:\/\/changyupump.com\/ar\/blog\/tio%e2%82%82-slurry-pump-acid-resistant-transfer-for-chemical-processing\/","title":{"rendered":"\u0645\u0636\u062e\u0629 \u0627\u0644\u0637\u064a\u0646 TiO\u2082: \u0646\u0642\u0644 \u0645\u0642\u0627\u0648\u0645 \u0644\u0644\u0623\u062d\u0645\u0627\u0636 \u0644\u0644\u0645\u0639\u0627\u0644\u062c\u0629 \u0627\u0644\u0643\u064a\u0645\u064a\u0627\u0626\u064a\u0629"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Quick Answer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A&nbsp;<strong>TiO\u2082 slurry pump<\/strong>&nbsp;is a heavy-duty pump engineered to handle the corrosive and abrasive slurries produced during titanium dioxide manufacturing. In the sulfate process, the pump must withstand hot sulfuric acid (up to 110\u00b0C) combined with abrasive titanium ore particles \u2014 a dual challenge that destroys standard stainless steel pumps within weeks. Key selection factors:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Material must resist acid and abrasion simultaneously<\/strong>: Stainless steel resists acid but wears rapidly from ore particles. Rubber resists abrasion but degrades in hot acid. UHMWPE (ultra-high molecular weight polyethylene) is one of the few materials that excels at both \u2014 it is chemically inert to sulfuric acid at concentrations up to 80% and temperatures up to 90\u00b0C, while its abrasion resistance significantly exceeds that of stainless steel.<\/li>\n\n\n\n<li><strong>Solids handling prevents clogging<\/strong>: TiO\u2082 process slurries contain up to 30% solid particles by weight \u2014 titanium ore, silica, and precipitated titanium dioxide crystals. Semi-open impellers and wide flow passages prevent the blockages that plague standard closed-impeller pumps.<\/li>\n\n\n\n<li><strong>Seal selection prevents acid leaks<\/strong>: Hot sulfuric acid slurry is a safety and environmental hazard. Double mechanical seals with a barrier fluid system provide the leak protection that single seals cannot guarantee in this aggressive service.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Titanium dioxide production, particularly the sulfate process, subjects pumps to one of the most aggressive combinations of corrosion and abrasion in the chemical industry. A stainless steel pump may survive the acid but wears through from ore particles within months. A rubber-lined pump may handle the particles but degrades in hot sulfuric acid. This is why the UHMWPE-lined pump has become the standard solution in TiO\u2082 plants worldwide \u2014 it is one of the few materials that can withstand both chemical attack from the acid and mechanical wear from the solids.<\/p>\n\n\n<style>.kb-image6180_8e7f12-3d .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image6180_8e7f12-3d size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing.webp\" alt=\"TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing\" class=\"kb-img wp-image-6325\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing.webp 1000w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing-16x12.webp 16w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">After reading this guide, you will understand the specific pump demands of each TiO\u2082 process stage, why UHMWPE outperforms both stainless steel and other lining materials, how to select the right pump configuration for your specific process, and how to prevent the most common failures in TiO\u2082 slurry pumping. With over 20 years of pump manufacturing experience, Changyu Pump presents this focused selection guide for TiO\u2082 and chemical processing applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. What Is a TiO\u2082 Slurry Pump?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/en.wikipedia.org\/wiki\/Titanium_dioxide\" target=\"_blank\" rel=\"noreferrer noopener\">Titanium dioxide<\/a>&nbsp;is produced primarily through the&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Sulfate_process\" target=\"_blank\" rel=\"noreferrer noopener\">sulfate process<\/a>, where ilmenite ore (FeTiO\u2083) is digested in concentrated sulfuric acid at elevated temperatures. The resulting slurry contains unreacted ore, silica impurities, and dissolved titanium sulfate \u2014 all suspended in hot, corrosive acid. This mixture then passes through a series of chemical treatment stages, each with different temperature, concentration, and solids content profiles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A TiO\u2082 slurry pump must handle this progression of aggressive fluids without corroding, clogging, or leaking. Standard chemical pumps fail because they are designed for either corrosion resistance (stainless steel, fluoroplastic-lined) or abrasion resistance (hard metal, rubber) \u2014 rarely both.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Dual Challenge of TiO\u2082 Slurries<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Challenge<\/th><th class=\"has-text-align-left\" data-align=\"left\">Source<\/th><th class=\"has-text-align-left\" data-align=\"left\">Effect on Pump<\/th><\/tr><\/thead><tbody><tr><td>Acid corrosion<\/td><td>Sulfuric acid (H\u2082SO\u2084) at 10\u201380% concentration, up to 110\u00b0C<\/td><td>Attacks stainless steel passive layer; degrades rubber linings; corrodes cast iron rapidly<\/td><\/tr><tr><td>Abrasive wear<\/td><td>Ilmenite ore particles, silica sand, unreacted solids up to 30% by weight<\/td><td>Erodes impeller vanes and casing walls; accelerates corrosion by removing protective films<\/td><\/tr><tr><td>Solids settling<\/td><td>High-density ore particles settle when flow stops or velocity drops<\/td><td>Clogs impeller passages; blocks suction lines; causes hard starting after idle periods<\/td><\/tr><tr><td>Temperature cycling<\/td><td>Process temperatures range from ambient to 110\u00b0C across different stages<\/td><td>Thermal expansion stresses lining-to-housing bond; accelerates seal wear<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">2. Why Is UHMWPE the Ideal Material for TiO\u2082 Slurry Pumps?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/en.wikipedia.org\/wiki\/Ultra-high-molecular-weight_polyethylene\" target=\"_blank\" rel=\"noreferrer noopener\">Ultra-high molecular weight polyethylene<\/a>&nbsp;has emerged as the material of choice for TiO\u2082 slurry pump construction because it uniquely addresses the combined acid-plus-abrasion challenge that defeats other materials.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">UHMWPE vs Alternative Materials<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Material<\/th><th class=\"has-text-align-left\" data-align=\"left\">Acid Resistance (H\u2082SO\u2084 up to 80%)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Abrasion Resistance<\/th><th class=\"has-text-align-left\" data-align=\"left\">Temperature Limit<\/th><th class=\"has-text-align-left\" data-align=\"left\">Relative Cost<\/th><th class=\"has-text-align-left\" data-align=\"left\">TiO\u2082 Service Life<\/th><\/tr><\/thead><tbody><tr><td>316L Stainless Steel<\/td><td>Poor \u2014 rapid corrosion above 50\u00b0C<\/td><td>Poor \u2014 soft, wears quickly from ore particles<\/td><td>High<\/td><td>Medium<\/td><td>2\u20136 months<\/td><\/tr><tr><td>Duplex Stainless Steel<\/td><td>Moderate \u2014 better than 316L, but still corrodes in hot acid<\/td><td>Moderate<\/td><td>High<\/td><td>High<\/td><td>6\u201312 months<\/td><\/tr><tr><td>Natural Rubber Lined<\/td><td>Poor \u2014 degrades in hot acid, temperature limited to 70\u00b0C<\/td><td>Excellent<\/td><td>70\u00b0C<\/td><td>Medium<\/td><td>3\u20139 months<\/td><\/tr><tr><td>PTFE\/PFA Lined<\/td><td>Excellent \u2014 universal acid resistance<\/td><td>Moderate \u2014 softer than UHMWPE, particles can embed and wear; shorter life in high-solids TiO\u2082 slurries<\/td><td>120\u2013160\u00b0C<\/td><td>High<\/td><td>12\u201324 months (shorter in high-solids stages; preferred for high-temperature, low-solids stages)<\/td><\/tr><tr><td>UHMWPE Lined<\/td><td>Excellent \u2014 chemically inert to H\u2082SO\u2084 up to 80%<\/td><td>Excellent \u2014 abrasion resistance significantly exceeds stainless steel; can handle up to 30% solids<\/td><td>90\u00b0C<\/td><td>Medium<\/td><td>18\u201336 months (varies by stage \u2014 longer in washing\/settling, shorter in digestion\/hydrolysis)<\/td><\/tr><tr><td>High-Chrome Alloy<\/td><td>Poor \u2014 no acid resistance<\/td><td>Excellent<\/td><td>High<\/td><td>Medium<\/td><td>1\u20133 months<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">What Makes UHMWPE Different<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">UHMWPE&#8217;s performance in TiO\u2082 service comes from its unique molecular structure. The extremely long polymer chains \u2014 much longer than standard polyethylene \u2014 create a material that is simultaneously:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chemically inert<\/strong>: UHMWPE resists sulfuric acid, hydrochloric acid, and most chemical solutions used in TiO\u2082 processing. It does not corrode, pit, or stress-crack in acidic environments.<\/li>\n\n\n\n<li><strong>Exceptionally abrasion-resistant<\/strong>: UHMWPE&#8217;s abrasion resistance significantly exceeds that of stainless steel. The material&#8217;s low coefficient of friction means particles slide across the surface rather than digging in and removing material.<\/li>\n\n\n\n<li><strong>Impact-resistant<\/strong>: Unlike brittle materials such as ceramics, UHMWPE absorbs impact from large particles without cracking or chipping.<\/li>\n\n\n\n<li><strong>Non-stick<\/strong>: UHMWPE&#8217;s low surface energy prevents TiO\u2082 particles and scale from adhering to pump internals \u2014 reducing clogging and making cleaning easier.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump recommend:<\/strong>&nbsp;For TiO\u2082 process stages operating below 90\u00b0C \u2014 which covers the majority of the sulfate process \u2014 UHMWPE-lined pumps provide the optimal combination of acid resistance, abrasion resistance, and service life. For stages exceeding 90\u00b0C (such as acid digestion), FEP or PFA-lined pumps provide the necessary temperature margin. For the hottest, most aggressive stages, a two-material strategy \u2014 UHMWPE for lower-temperature, high-solids stages and FEP for high-temperature stages \u2014 optimizes both pump life and total cost of ownership.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. How to Select a TiO\u2082 Slurry Pump by Process Stage?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The titanium dioxide sulfate process flows through distinct stages, each with different fluid characteristics. Matching the pump configuration to each stage is the key to reliable, long-term operation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TiO\u2082 Sulfate Process Stage-by-Stage Pump Selection<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Process Stage<\/th><th class=\"has-text-align-left\" data-align=\"left\">Fluid Characteristics<\/th><th class=\"has-text-align-left\" data-align=\"left\">Temperature<\/th><th class=\"has-text-align-left\" data-align=\"left\">Solids Content<\/th><th class=\"has-text-align-left\" data-align=\"left\">Recommended Pump Configuration<\/th><\/tr><\/thead><tbody><tr><td><strong>Acid digestion (reactor discharge)<\/strong><\/td><td>Ilmenite ore + 70\u201380% H\u2082SO\u2084 slurry, highly abrasive<\/td><td>90\u2013110\u00b0C<\/td><td>20\u201330%<\/td><td>FEP-lined pump (CYB Series) with semi-open impeller; double mechanical seal. UHMWPE-lined pump (UHB Series) acceptable only for intermittent or lower-temperature transfer (&lt;90\u00b0C)<\/td><\/tr><tr><td><strong>Acid digestion (slurry transfer)<\/strong><\/td><td>Ilmenite ore + 70\u201380% H\u2082SO\u2084 slurry, moderate abrasion<\/td><td>60\u201390\u00b0C<\/td><td>20\u201330%<\/td><td>UHMWPE-lined pump with semi-open impeller; double mechanical seal<\/td><\/tr><tr><td><strong>Settling \/ clarification<\/strong><\/td><td>Dilute acid slurry with fine settled solids, moderate abrasion<\/td><td>40\u201360\u00b0C<\/td><td>5\u201315%<\/td><td>UHMWPE-lined pump with semi-open impeller; single or double mechanical seal<\/td><\/tr><tr><td><strong>Freezing \/ crystallization<\/strong><\/td><td>FeSO\u2084\u00b77H\u2082O crystal slurry in sulfuric acid solution<\/td><td>0\u201315\u00b0C<\/td><td>10\u201320% crystal solids<\/td><td>UHMWPE-lined pump \u2014 UHMWPE retains impact strength at low temperatures; semi-open impeller<\/td><\/tr><tr><td><strong>Hydrolysis<\/strong><\/td><td>Precipitated TiO\u2082 particles in dilute acid, fine abrasive slurry<\/td><td>80\u2013100\u00b0C<\/td><td>10\u201320%<\/td><td>UHMWPE-lined pump (for \u226490\u00b0C); FEP-lined pump (for &gt;90\u00b0C); semi-open impeller<\/td><\/tr><tr><td><strong>Washing \/ filtration<\/strong><\/td><td>TiO\u2082 filter cake slurry, moderate solids, dilute acid<\/td><td>30\u201360\u00b0C<\/td><td>15\u201325%<\/td><td>UHMWPE-lined pump with semi-open impeller; single mechanical seal<\/td><\/tr><tr><td><strong>Salt treatment<\/strong><\/td><td>TiO\u2082 slurry with added chemicals (K\u2082CO\u2083, H\u2083PO\u2084), moderate abrasion<\/td><td>40\u201370\u00b0C<\/td><td>10\u201320%<\/td><td>UHMWPE-lined pump with semi-open impeller; double mechanical seal for chemical additives<\/td><\/tr><tr><td><strong>Calcination feed<\/strong><\/td><td>Thickened TiO\u2082 paste, very high solids, low acidity<\/td><td>20\u201340\u00b0C<\/td><td>25\u201340%<\/td><td>UHMWPE-lined pump or progressive cavity pump for very high solids<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Key Selection Rules by Stage<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Acid digestion \u2014 the hottest stage<\/strong>: Acid digestion reactor discharge temperatures range from 90\u2013110\u00b0C. This exceeds UHMWPE&#8217;s 90\u00b0C limit. The primary recommendation for this stage is an FEP-lined pump (CYB Series) rated to 120\u00b0C. UHMWPE pumps may only be considered for downstream slurry transfer where the temperature has dropped below 90\u00b0C.<\/li>\n\n\n\n<li><strong>Stages with high solids (&gt;20%)<\/strong>: UHMWPE-lined pumps with semi-open impellers handle up to 30% solids. For calcination feed exceeding 30% solids, a progressive cavity pump provides better handling.<\/li>\n\n\n\n<li><strong>Stages with chemical additives<\/strong>: When the slurry contains potassium, phosphate, or other treatment chemicals in addition to sulfuric acid, verify that all wetted materials (including seal elastomers) are compatible with the complete chemical mixture.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump recommend:<\/strong>&nbsp;For the majority of TiO\u2082 sulfate process stages \u2014 settling, washing, salt treatment, and freezing \u2014 UHMWPE-lined pumps provide the most cost-effective, longest-life solution. For the acid digestion reactor discharge, FEP-lined pumps are the required specification due to temperatures exceeding 90\u00b0C. This two-material strategy optimizes both pump life and total cost of ownership across the entire plant.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7-1024x768.webp\" alt=\"TiO\u2082 Slurry Pump\" class=\"wp-image-3381\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7-1024x768.webp 1024w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7-16x12.webp 16w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-7.webp 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">4. How to Prevent Clogging and Crystallization in TiO\u2082 Pumps?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">TiO\u2082 slurries present two distinct clogging risks that must be addressed in pump selection and system design.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Solids Settling During Idle Periods<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The ore particles and TiO\u2082 crystals in the slurry are dense. When a pump stops, these solids settle rapidly in the casing, suction pipe, and impeller passages. On restart, the pump must overcome a compacted layer of settled solids \u2014 causing hard starting, motor overload, or impeller damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Prevention measures:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Semi-open impeller design<\/strong>: Unlike closed impellers with narrow internal passages, a semi-open impeller has no front shroud where solids can accumulate. The open vane design allows settled solids to be flushed out on restart.<\/li>\n\n\n\n<li><strong>Flush system for idle protection<\/strong>: For pumps that are shut down for extended periods, an external flush system displaces slurry from the pump internals before solids can settle. The flush liquid must be chemically compatible with the process fluid \u2014&nbsp;<strong>water flushing of concentrated acid pumps is dangerous due to exothermic reaction and must be avoided.<\/strong>&nbsp;Use a compatible process-compatible liquid instead.<\/li>\n\n\n\n<li><strong>Minimum flow velocity<\/strong>: Maintain at least 1.5 m\/s flow velocity in all slurry piping to prevent solids from settling during operation.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Sulfate Crystal Formation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In the freezing and crystallization stages, dissolved iron sulfate (FeSO\u2084) crystallizes out of solution. These crystals can form on pump surfaces, seal faces, and in small clearances \u2014 causing mechanical seal failure and increased wear.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Prevention measures:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Polished internal surfaces<\/strong>: The naturally low-friction surface of UHMWPE resists crystal adhesion. Unlike rough cast metal surfaces, UHMWPE does not provide nucleation sites for crystal growth.<\/li>\n\n\n\n<li><strong>Seal environmental control<\/strong>: An external flush to the mechanical seal faces prevents crystals from forming in the close-clearance seal gap during idle periods.<\/li>\n\n\n\n<li><strong>Temperature management<\/strong>: Maintaining the pump casing temperature above the crystallization point prevents crystal formation during brief shutdowns.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">5. What Seal Arrangement Is Best for TiO\u2082 Slurry Pumps?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Seal selection for TiO\u2082 slurry pumps is driven by three factors: the hazardous nature of hot sulfuric acid, the abrasive solids in the slurry, and the risk of crystallization at the seal faces during idle periods.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Seal Options for TiO\u2082 Service<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Seal Type<\/th><th class=\"has-text-align-left\" data-align=\"left\">Best For<\/th><th class=\"has-text-align-left\" data-align=\"left\">Limitations in TiO\u2082 Service<\/th><\/tr><\/thead><tbody><tr><td>Single mechanical seal<\/td><td>Non-hazardous, low-temperature, low-solids stages<\/td><td>Abrasive particles invade seal faces; acid leakage on failure is a safety hazard; crystallization during idle damages faces<\/td><\/tr><tr><td>Double mechanical seal (back-to-back)<\/td><td>Hazardous acid stages; high-temperature; high-solids<\/td><td>Higher initial cost; requires clean barrier fluid supply<\/td><\/tr><tr><td>Double mechanical seal with external flush<\/td><td>Stages with crystallization risk; intermittent duty<\/td><td>Requires flush system installation and operation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Why Double Seals Are the Standard for TiO\u2082 Service<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A double mechanical seal arrangement \u2014 two seals mounted back-to-back with a clean barrier fluid circulating between them at a pressure higher than the pumped slurry \u2014 provides three critical advantages in TiO\u2082 applications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Leak containment<\/strong>: If the inboard seal fails, the barrier fluid \u2014 not the acid slurry \u2014 leaks out. This prevents hazardous acid releases and protects the bearing housing from corrosion.<\/li>\n\n\n\n<li><strong>Face protection<\/strong>: The barrier fluid lubricates and cools both seal faces, preventing the abrasive slurry from contacting the outboard seal. This extends seal life significantly compared to single seals running directly in the slurry.<\/li>\n\n\n\n<li><strong>Crystallization prevention<\/strong>: The circulating barrier fluid prevents slurry from stagnating and crystallizing at the seal faces during idle periods.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump recommend:<\/strong>&nbsp;For any TiO\u2082 process stage handling hot sulfuric acid slurry, specify a double mechanical seal with a clean water or compatible barrier fluid system. The incremental cost of the double seal is recovered within the first avoided seal failure \u2014 a leaking single seal on an acid pump is a safety incident, not a maintenance item.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6. How to Select the Right TiO\u2082 Slurry Pump?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">TiO\u2082 slurry pump selection follows a structured process based on process stage, fluid characteristics, and operating requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1: Identify the Process Stage.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Determine which TiO\u2082 process stage the pump will serve. Use the stage-by-stage selection matrix in Section 3 to identify the typical fluid characteristics and recommended pump configuration for that stage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: Confirm Temperature and Solids Content.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the maximum operating temperature and solids concentration at your specific plant. These two parameters determine whether UHMWPE (\u226490\u00b0C, \u226430% solids) or FEP (\u2264120\u00b0C, moderate solids) is the appropriate lining material.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: Select the Seal Arrangement.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Based on the acid concentration, temperature, and hazard level of the stage, select the appropriate seal type using the table in Section 5. For hot acid stages, specify a double mechanical seal with barrier fluid.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 4: Size the Pump.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Calculate the required flow rate and total dynamic head. For slurry service, apply a 10\u201315% safety factor to the flow rate to account for viscosity effects. Size the suction line at least 1.5 times the pump inlet diameter to ensure adequate NPSH with high-density slurries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 5: Plan for Maintenance.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Arrange the pump installation for easy access to the casing, impeller, and seal for routine inspection and replacement. Keep a spare mechanical seal set and impeller in inventory \u2014 TiO\u2082 slurry pumps operate in one of the most aggressive services in the chemical industry, and planned maintenance is always less costly than unplanned downtime.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Engineers at Changyu Pump recommend:<\/strong>&nbsp;For any TiO\u2082 process stage operating below 90\u00b0C with solids content above 10%, specify a UHMWPE-lined pump with a semi-open impeller and double mechanical seal. This configuration has proven to deliver the longest service life and lowest total cost of ownership across multiple TiO\u2082 plants. For acid digestion reactor discharge above 90\u00b0C, FEP-lined pumps are the required specification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. Changyu Pump TiO\u2082 Slurry Pump Solutions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Changyu Pump manufactures pump series specifically engineered for the dual corrosion-plus-abrasion challenge of TiO\u2082 production. Two series serve the majority of TiO\u2082 process stages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TiO\u2082 Slurry Pump Selection Guide<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Process Stage<\/th><th class=\"has-text-align-left\" data-align=\"left\">Temperature<\/th><th class=\"has-text-align-left\" data-align=\"left\">Primary Recommendation<\/th><th class=\"has-text-align-left\" data-align=\"left\">Alternative<\/th><\/tr><\/thead><tbody><tr><td>Acid digestion (reactor discharge &gt;90\u00b0C)<\/td><td>90\u2013110\u00b0C<\/td><td>CYB Series (FEP-lined)<\/td><td>\u2014<\/td><\/tr><tr><td>Acid digestion (slurry transfer \u226490\u00b0C)<\/td><td>60\u201390\u00b0C<\/td><td>UHB Series (UHMWPE-lined)<\/td><td>\u2014<\/td><\/tr><tr><td>Settling, washing, salt treatment<\/td><td>Up to 90\u00b0C<\/td><td>UHB Series (UHMWPE-lined)<\/td><td>\u2014<\/td><\/tr><tr><td>Hydrolysis<\/td><td>80\u2013100\u00b0C<\/td><td>UHB Series (for \u226490\u00b0C); CYB Series (&gt;90\u00b0C)<\/td><td>\u2014<\/td><\/tr><tr><td>Freezing \/ crystallization<\/td><td>0\u201315\u00b0C<\/td><td>UHB Series (UHMWPE-lined)<\/td><td>\u2014<\/td><\/tr><tr><td>Calcination feed (very high solids)<\/td><td>Up to 40\u00b0C<\/td><td>UHB Series (UHMWPE-lined)<\/td><td>G-Type Screw Pump (if &gt;30% solids)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">UHB Series \u2014 UHMWPE-Lined Slurry Pump for TiO\u2082 Production<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2.webp\" alt=\"UHB Series-Horizontal Phosphoric Acid Slurry Pump\" class=\"wp-image-1826\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2.webp 800w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/UHB-Series-Horizontal-Phosphoric-Acid-Slurry-Pump_2-768x576.webp 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"UHB and CYG series slurry pump\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/HJKft5LWZfE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The UHB Series is the workhorse pump for titanium dioxide processing. Its steel-reinforced UHMWPE lining provides the acid resistance of a fluoroplastic pump combined with the abrasion resistance needed for ore slurries. The semi-open impeller handles up to 30% solid content without clogging.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key features for TiO\u2082 service:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>UHMWPE lining chemically inert to sulfuric acid up to 80% concentration at temperatures up to 90\u00b0C<\/li>\n\n\n\n<li>Abrasion resistance significantly exceeding stainless steel \u2014 handles ore particles that wear through metal pumps within months<\/li>\n\n\n\n<li>Semi-open impeller prevents clogging from settled solids and fibrous material<\/li>\n\n\n\n<li>Available with double mechanical seal configuration for hot acid stages<\/li>\n\n\n\n<li>Low operating speed (750\u20131,450 r\/min) reduces wear rate and extends service life<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Specification<\/th><\/tr><\/thead><tbody><tr><td>Flow rate<\/td><td>3\u20132,600 m\u00b3\/h<\/td><\/tr><tr><td>Head<\/td><td>5\u2013100 m<\/td><\/tr><tr><td>Motor power<\/td><td>0.75\u2013300 kW<\/td><\/tr><tr><td>Speed<\/td><td>750\u20132,900 r\/min<\/td><\/tr><tr><td>Temperature<\/td><td>-20\u00b0C to 90\u00b0C<\/td><\/tr><tr><td>Lining material<\/td><td>UHMWPE<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/changyupump.com\/product\/chemical-horizontal-slurry-pump\/\" target=\"_blank\" rel=\"noreferrer noopener\">View UHB Series \u2192<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">CYB Series \u2014 FEP-Lined Pump for High-Temperature TiO\u2082 Stages<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"600\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/CYB-ZKJ-Series-Corrosion-Resistant-Horizontal-Slurry-Pump.webp\" alt=\"CYB-ZKJ Series Corrosion Resistant Horizontal Slurry Pump\" class=\"wp-image-1770\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/CYB-ZKJ-Series-Corrosion-Resistant-Horizontal-Slurry-Pump.webp 800w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/CYB-ZKJ-Series-Corrosion-Resistant-Horizontal-Slurry-Pump-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/CYB-ZKJ-Series-Corrosion-Resistant-Horizontal-Slurry-Pump-768x576.webp 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"CYB ZKJ series corrosive chemical transfer pumps\" width=\"720\" height=\"405\" src=\"https:\/\/www.youtube.com\/embed\/d4yelav6a78?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">For TiO\u2082 process stages operating above the 90\u00b0C limit of UHMWPE \u2014 particularly acid digestion reactor discharge and high-temperature hydrolysis \u2014 the CYB Series provides an FEP fluoroplastic lining rated to 120\u00b0C. FEP offers near-universal acid resistance and a non-stick surface that resists scale buildup.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key features for high-temperature TiO\u2082 service:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>FEP lining resistant to sulfuric acid at all concentrations up to 120\u00b0C<\/li>\n\n\n\n<li>Non-stick surface prevents TiO\u2082 scale and sulfate crystal adhesion<\/li>\n\n\n\n<li>Double mechanical seal with barrier fluid for hot acid containment<\/li>\n\n\n\n<li>Suitable for acid digestion, high-temperature hydrolysis, and concentrated acid feed<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Parameter<\/th><th class=\"has-text-align-left\" data-align=\"left\">Specification<\/th><\/tr><\/thead><tbody><tr><td>Flow rate<\/td><td>3\u20132,600 m\u00b3\/h<\/td><\/tr><tr><td>Head<\/td><td>5\u2013100 m<\/td><\/tr><tr><td>Motor power<\/td><td>0.75\u2013300 kW<\/td><\/tr><tr><td>Speed<\/td><td>968\u20133,450 r\/min<\/td><\/tr><tr><td>Temperature<\/td><td>-80\u00b0C to 120\u00b0C<\/td><\/tr><tr><td>Lining material<\/td><td>FEP<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/changyupump.com\/product\/corrosive-chemical-transfer-pump\/\" target=\"_blank\" rel=\"noreferrer noopener\">View CYB Series \u2192<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8. Case Study of TiO\u2082 Slurry Pump: Solving an Acid Leakage Failure in a TiO\u2082 Plant<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A titanium dioxide plant in China operated the sulfate process with an annual capacity of 50,000 tons. The settling stage \u2014 where digested ilmenite slurry at 50\u201360\u00b0C with 15\u201320% solids is clarified \u2014 was originally equipped with 316L stainless steel centrifugal pumps fitted with closed impellers and single mechanical seals.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6-1024x768.webp\" alt=\"slurry pump\" class=\"wp-image-3380\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6-1024x768.webp 1024w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6-16x12.webp 16w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/slurry-pump-for-sulfuric-acid-6.webp 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Within three months of operation, plant maintenance records documented:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Casing wear through<\/strong>: Two of four pumps required complete casing replacement due to acid corrosion combined with erosion from ore particles. The 316L stainless steel, while resistant to sulfuric acid at ambient temperature, corroded at an accelerated rate at 50\u201360\u00b0C. The ore particles then eroded the weakened surface, creating deep grooves in the volute wall. The closed impeller design trapped settled solids, further accelerating internal wear.<\/li>\n\n\n\n<li><strong>Seal failures<\/strong>: The single mechanical seals failed on average every 6\u20138 weeks. Abrasive slurry particles invaded the seal faces, and acid crystallization during weekend shutdowns prevented the seal faces from seating properly on Monday restart.<\/li>\n\n\n\n<li><strong>Production impact<\/strong>: Each pump failure required 4\u20136 hours of downtime for replacement. With two pumps often out of service simultaneously, the settling stage operated below capacity, creating a bottleneck in the production line.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Changyu Pump engineers replaced all four settling stage pumps with UHB Series UHMWPE-lined slurry pumps configured with semi-open impellers and double mechanical seals with external barrier fluid flush.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The UHMWPE lining provided simultaneous resistance to sulfuric acid corrosion and ore particle abrasion \u2014 the two failure mechanisms that had destroyed the stainless steel pumps. The semi-open impeller eliminated the clogging that occurred when settled solids accumulated in the previous closed impellers. The double mechanical seals, with clean water barrier fluid, prevented both abrasive particle ingress and acid crystallization at the seal faces.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"563\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Slurry-Pump.webp\" alt=\"TiO\u2082 Slurry Pump\" class=\"wp-image-6328\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Slurry-Pump.webp 1000w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Slurry-Pump-300x169.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Slurry-Pump-150x84.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Slurry-Pump-768x432.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/Slurry-Pump-18x10.webp 18w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Three years after replacement: zero casing replacements, seal life extended to 12\u201318 months (from 6\u20138 weeks), and zero production downtime attributed to settling stage pump failures. The plant extended the UHMWPE-lined pump specification to the washing and salt treatment stages during the next scheduled maintenance cycle.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Key takeaway<\/strong>: Stainless steel cannot serve as a long-term pump material in TiO\u2082 slurry service. The combination of hot sulfuric acid and abrasive ore particles destroys stainless steel through a synergistic corrosion-erosion mechanism that UHMWPE-lined pumps are specifically engineered to resist.<\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/changyupump.com\/contacts\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"273\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-1024x273.webp\" alt=\"Contact Changyu Pump for a quote\" class=\"wp-image-5665\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-1024x273.webp 1024w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-300x80.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-150x40.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-768x204.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-1536x409.webp 1536w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-2048x545.webp 2048w, https:\/\/changyupump.com\/wp-content\/uploads\/2026\/05\/Contact-Changyu-Pump-for-a-quote-18x5.webp 18w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">FAQs about TiO\u2082 Slurry Pumps<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Why does stainless steel fail so quickly in TiO\u2082 slurry service?<\/strong><br>A: Stainless steel faces a dual attack: hot sulfuric acid corrodes the passive oxide layer that protects the metal, while abrasive ore particles erode the weakened surface. This corrosion-erosion synergy removes material far faster than either mechanism alone. UHMWPE resists both \u2014 it is chemically inert to the acid and highly resistant to abrasion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: Can one pump type serve all TiO\u2082 process stages?<\/strong><br>A: No. The majority of stages \u2014 settling, washing, salt treatment, freezing, and calcination feed \u2014 are best served by UHMWPE-lined pumps. The acid digestion reactor discharge stage, where temperatures exceed 90\u00b0C, requires FEP-lined pumps with higher temperature ratings.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What temperature limit applies to UHMWPE-lined pumps?<\/strong><br>A: UHMWPE-lined pumps are rated for continuous service at temperatures up to 90\u00b0C. This covers most TiO\u2082 sulfate process stages. For stages exceeding 90\u00b0C \u2014 particularly acid digestion reactor discharge \u2014 specify FEP-lined pumps rated to 120\u00b0C.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: How do I prevent my TiO\u2082 slurry pump from clogging after shutdown?<\/strong><br>A: Three measures prevent shutdown clogging: specify a semi-open impeller that does not trap solids, install an external flush system with a compatible liquid to displace slurry before solids settle, and maintain a minimum flow velocity of 1.5 m\/s during operation. Never use water to flush concentrated acid pumps \u2014 the exothermic reaction is dangerous.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: What seal type is recommended for hot acid TiO\u2082 stages?<\/strong><br>A: Double mechanical seals with a clean barrier fluid system. The barrier fluid prevents abrasive slurry from contacting the seal faces and stops acid crystallization during idle periods. Single seals are not recommended for hot acid stages due to safety and reliability risks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q: How do UHMWPE and FEP compare for TiO\u2082 service?<\/strong><br>A: UHMWPE provides superior abrasion resistance at a lower cost, making it the first choice for stages below 90\u00b0C. FEP provides superior temperature resistance (up to 120\u00b0C) and universal acid resistance, making it the choice for the hottest, most corrosive stages. Together, they cover the full TiO\u2082 sulfate process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Changyu Pump Engineer&#8217;s Avoidance Checklist<\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Never specify stainless steel for TiO\u2082 slurry service. The combination of hot acid and abrasive ore particles will destroy the pump within months.<\/li>\n\n\n\n<li>Match the lining material to the stage temperature. UHMWPE for \u226490\u00b0C; FEP for &gt;90\u00b0C (acid digestion reactor discharge).<\/li>\n\n\n\n<li>Specify semi-open impellers for all TiO\u2082 slurry stages. Closed impellers trap settled solids and clog on restart.<\/li>\n\n\n\n<li>Install double mechanical seals on all hot acid stages. Single seals on acid pumps are a safety risk and a false economy.<\/li>\n\n\n\n<li>Maintain minimum flow velocity of 1.5 m\/s in all slurry piping. Lower velocities allow ore particles to settle and block the line.<\/li>\n\n\n\n<li>Flush pumps with a compatible liquid (never water for concentrated acid) before extended shutdowns. This displaces slurry from the casing and seal chamber.<\/li>\n\n\n\n<li>Keep spare impellers, mechanical seal sets, and casing liners in inventory. TiO\u2082 slurry pumps operate in one of the most aggressive services in the chemical industry.<\/li>\n\n\n\n<li>Monitor flow rate and discharge pressure trends. A gradual flow decline at constant speed indicates impeller or casing wear \u2014 schedule replacement before the pump fails.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A TiO\u2082 slurry pump operates in one of the most aggressive environments in the chemical industry \u2014 hot sulfuric acid combined with abrasive ore particles creates a corrosion-erosion synergy that standard pump materials cannot survive. UHMWPE-lined pumps have become the industry standard for the majority of TiO\u2082 sulfate process stages because this material uniquely resists both chemical attack and mechanical wear, delivering 18\u201336 months of service life where stainless steel fails within 3\u20136 months.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The key to reliable TiO\u2082 pump operation is matching the pump configuration to the specific process stage: UHMWPE-lined pumps with semi-open impellers and double mechanical seals for settling, washing, salt treatment, and freezing stages; FEP-lined pumps for the acid digestion reactor discharge stage where temperatures exceed 90\u00b0C. This two-material strategy optimizes both service life and total cost of ownership across the entire plant.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"908\" height=\"681\" src=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/Slurry-Pump07.webp\" alt=\"TiO\u2082 Slurry Pump\" class=\"wp-image-3382\" srcset=\"https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/Slurry-Pump07.webp 908w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/Slurry-Pump07-300x225.webp 300w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/Slurry-Pump07-150x113.webp 150w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/Slurry-Pump07-768x576.webp 768w, https:\/\/changyupump.com\/wp-content\/uploads\/2025\/10\/Slurry-Pump07-16x12.webp 16w\" sizes=\"auto, (max-width: 908px) 100vw, 908px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Changyu Pump&#8217;s engineering team provides tailored technical assessments for TiO\u2082 slurry pump applications \u2014 covering process stage analysis, material selection, seal configuration, and pump sizing. Two decades of manufacturing experience in corrosive and abrasive chemical applications inform every recommendation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/changyupump.com\/contacts\/\" target=\"_blank\" rel=\"noreferrer noopener\">Contact Changyu Pump for a free technical assessment \u2192<\/a><\/p>\n\n\n<div class=\"wp-block-kadence-advanced-form wp-block-kadence-advanced-form1246-cpt-id kb-adv-form-label-style-normal kb-adv-form-input-size-standard kb-form-basic-style\"><form id=\"kb-adv-form-1246-cpt-id\" class=\"kb-advanced-form\" method=\"post\">\n<style>.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{align-content:start;}:where(.kb-row-layout-id16_395842-3c > .kt-row-column-wrap) > .wp-block-kadence-column{justify-content:start;}.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:var(--global-kb-gap-md, 2rem);padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;grid-template-columns:repeat(2, minmax(0, 1fr));}.kb-row-layout-id16_395842-3c > .kt-row-layout-overlay{opacity:0.30;}@media all and (max-width: 1024px){.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{grid-template-columns:repeat(2, minmax(0, 1fr));}}@media all and (max-width: 767px){.kb-row-layout-id16_395842-3c > .kt-row-column-wrap{grid-template-columns:minmax(0, 1fr);}}<\/style><div class=\"kb-row-layout-wrap kb-row-layout-id16_395842-3c alignnone wp-block-kadence-rowlayout\"><div class=\"kt-row-column-wrap kt-has-2-columns kt-row-layout-equal kt-tab-layout-inherit kt-mobile-layout-row kt-row-valign-top\">\n<style>.kadence-column16_3a38e5-5d > .kt-inside-inner-col,.kadence-column16_3a38e5-5d > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column16_3a38e5-5d > 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id=\"field124697066f-d3\" data-label=\"Whatsapp\/Phone\" type=\"text\" placeholder=\"\" value=\"\" data-type=\"text\" class=\"kb-field kb-text-field\" data-required=\"no\" \/><\/div>\n\n<div class=\"kb-adv-form-field kb-adv-form-text-type-input kb-adv-form-infield-type-input kb-field1246ae3276-7e wp-block-kadence-advanced-form-textarea\"><label class=\"kb-adv-form-label\" for=\"field1246ae3276-7e\">Message<span class=\"kb-adv-form-required\">*<\/span><\/label><textarea name=\"fieldae3276-7e\" id=\"field1246ae3276-7e\" rows=\"4\"  data-label=\"Message\" placeholder=\"\" data-type=\"textarea\" class=\"kb-field kb-textarea-field\" data-required=\"yes\" required aria-required=\"true\"><\/textarea><\/div>\n\n<style>ul.menu .kb-submit-field .kb-btnd4ade1-86.kb-button{width:initial;}.kb-submit-field .kb-btnd4ade1-86.kb-button{background:var(--global-palette1, #3182CE);}.kb-submit-field .kb-btnd4ade1-86.kb-button:hover, .kb-submit-field .kb-btnd4ade1-86.kb-button:focus{background:var(--global-palette2, #2B6CB0);}.kb-submit-field.kb-fieldd4ade1-86{justify-content:flex-start;}<\/style><div class=\"kb-adv-form-field kb-submit-field kb-fieldd4ade1-86 wp-block-kadence-advanced-form-submit\"><button class=\"kb-button kt-button button kb-adv-form-submit-button kb-btnd4ade1-86 kt-btn-size-standard kt-btn-width-type-auto kb-btn-global-inherit kt-btn-has-text-true kt-btn-has-svg-false wp-block-button__link\" type=\"submit\"><span class=\"kt-btn-inner-text\">Submit<\/span><\/button><\/div>\n<input type=\"hidden\" name=\"_kb_adv_form_post_id\" value=\"1246\"><input type=\"hidden\" name=\"action\" value=\"kb_process_advanced_form_submit\"><input type=\"hidden\" name=\"_kb_adv_form_id\" value=\"1246-cpt-id\"><\/form><\/div>\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does stainless steel fail so quickly in TiO\u2082 slurry service?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel faces a dual attack: hot sulfuric acid corrodes the passive oxide layer, while abrasive ore particles erode the weakened surface. This corrosion-erosion synergy removes material far faster than either mechanism alone. UHMWPE resists both.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can one pump type serve all TiO\u2082 process stages?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Most stages are best served by UHMWPE-lined pumps. The acid digestion reactor discharge stage, where temperatures exceed 90\u00b0C, requires FEP-lined pumps with higher temperature ratings.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What temperature limit applies to UHMWPE-lined pumps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"UHMWPE-lined pumps are rated for continuous service up to 90\u00b0C. For stages exceeding 90\u00b0C, specify FEP-lined pumps rated to 120\u00b0C.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I prevent my TiO\u2082 slurry pump from clogging after shutdown?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Specify a semi-open impeller, install an external flush system with a compatible liquid to displace slurry before solids settle, and maintain a minimum flow velocity of 1.5 m\/s. Never use water to flush concentrated acid pumps.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What seal type is recommended for hot acid TiO\u2082 stages?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Double mechanical seals with a clean barrier fluid system. The barrier fluid prevents abrasive slurry from contacting the seal faces and stops acid crystallization during idle periods.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do UHMWPE and FEP compare for TiO\u2082 service?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"UHMWPE provides superior abrasion resistance at lower cost for stages below 90\u00b0C. FEP provides superior temperature resistance up to 120\u00b0C for the hottest, most corrosive stages.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer A&nbsp;TiO\u2082 slurry pump&nbsp;is a heavy-duty pump engineered to handle the corrosive and abrasive slurries produced&#8230;<\/p>","protected":false},"author":2,"featured_media":6325,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[12],"tags":[],"class_list":["post-6180","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"taxonomy_info":{"category":[{"value":12,"label":"Blog"}]},"featured_image_src_large":["https:\/\/changyupump.com\/wp-content\/uploads\/2026\/07\/TiO\u2082-Slurry-Pump-Acid-Resistant-Transfer-for-Chemical-Processing.webp",1000,750,false],"author_info":{"display_name":"Changyu_","author_link":"https:\/\/changyupump.com\/ar\/author\/changyu_\/"},"comment_info":0,"category_info":[{"term_id":12,"name":"Blog","slug":"blog","term_group":0,"term_taxonomy_id":12,"taxonomy":"category","description":"","parent":0,"count":152,"filter":"raw","cat_ID":12,"category_count":152,"category_description":"","cat_name":"Blog","category_nicename":"blog","category_parent":0}],"tag_info":false,"_links":{"self":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts\/6180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/comments?post=6180"}],"version-history":[{"count":7,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts\/6180\/revisions"}],"predecessor-version":[{"id":6331,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/posts\/6180\/revisions\/6331"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/media\/6325"}],"wp:attachment":[{"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/media?parent=6180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/categories?post=6180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/changyupump.com\/ar\/wp-json\/wp\/v2\/tags?post=6180"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}