{"id":6176,"date":"2026-06-27T06:24:00","date_gmt":"2026-06-27T14:24:00","guid":{"rendered":"https:\/\/changyupump.com\/?p=6176"},"modified":"2026-07-02T06:29:07","modified_gmt":"2026-07-02T14:29:07","slug":"acid-slurry-pump-for-hydrometallurgy-how-to-choose","status":"publish","type":"post","link":"https:\/\/changyupump.com\/vi\/blog\/acid-slurry-pump-for-hydrometallurgy-how-to-choose\/","title":{"rendered":"B\u01a1m B\u00f9n Axit cho Th\u1ee7y luy\u1ec7n: C\u00e1ch Ch\u1ecdn"},"content":{"rendered":"\n

Quick Answer<\/h2>\n\n\n\n

An acid slurry pump for hydrometallurgy<\/strong> is an industrial pump engineered to transfer highly corrosive acidic solutions mixed with abrasive solid ore particles \u2014 a combination of chemical attack and mechanical wear that destroys standard pumps within weeks. Key selection factors:<\/p>\n\n\n\n

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  1. Material must resist both acid and abrasion<\/strong>: Standard stainless steel pumps (316L) corrode in the hot, concentrated acids used for metal leaching. High-chrome alloy pumps resist abrasion but dissolve in acid. Rubber-lined pumps soften at elevated temperatures. UHMWPE (Ultra-High Molecular Weight Polyethylene) lining provides a unique combination of acid resistance across the pH range typical of hydrometallurgical leaching acids and abrasion resistance that handles up to 30% solid content.<\/li>\n\n\n\n
  2. Match the pump to the specific hydrometallurgical process<\/strong>: Copper leaching uses sulfuric acid at moderate temperatures. Nickel laterite leaching uses sulfuric acid at high temperatures and pressures. Rare earth processing uses hydrochloric acid or mixed acids. Each process demands specific material and seal configurations.<\/li>\n\n\n\n
  3. Solids concentration determines impeller design<\/strong>: Low solids (< 10%) allow closed impellers for maximum efficiency. Medium solids (10\u201320%) require semi-open impellers. High solids (20\u201330%) demand vortex or special wide-passage designs that prevent clogging from ore particles.<\/li>\n<\/ol>\n\n\n\n

    Hydrometallurgy dissolves metals from their ores using acid \u2014 and then asks a pump to move the resulting corrosive, abrasive slurry. A pump that resists the acid but wears out from the solids is as useless as a pump that handles the solids but corrodes from the acid. This dual challenge is why standard chemical pumps and standard slurry pumps both fail in hydrometallurgical service: neither is designed for the combination.<\/p>\n\n\n\n

    \"Acid<\/figure>\n\n\n\n

    After reading this guide, you will understand why hydrometallurgy demands a specialized pump, which materials actually work in acid slurry service, how to match pump specifications to specific metal recovery processes, and how to select a pump that delivers reliable service life in your leaching circuit.<\/p>\n\n\n\n

    1. Why Does Hydrometallurgy Need a Special Acid Slurry Pump?<\/h2>\n\n\n\n

    Hydrometallurgy<\/a> extracts metals \u2014 copper, zinc, nickel, cobalt, gold, uranium, rare earths \u2014 by dissolving ore in acid and then recovering the metal from the solution. The pump moves this mixture between leaching tanks, thickeners, filters, and electrowinning cells.<\/p>\n\n\n\n

    The Dual Destruction Mechanism<\/h3>\n\n\n\n

    A pump in hydrometallurgical service faces two simultaneous attacks:<\/p>\n\n\n\n

    Chemical corrosion from the acid:<\/strong> Leaching acids include sulfuric acid (copper, zinc, nickel), hydrochloric acid (rare earths, titanium), nitric acid (silver, uranium), and mixed acids. These acids attack metal pump components \u2014 316L stainless steel, the standard for chemical pumps, corrodes rapidly in hot, concentrated acid. Elastomers like EPDM and natural rubber swell, soften, and degrade.<\/p>\n\n\n\n

    Mechanical abrasion from the ore solids:<\/strong> The acid slurry contains crushed ore particles \u2014 silica, metal oxides, undissolved sulfides \u2014 at concentrations from 5% to 30% by weight. These particles grind against pump surfaces at flow velocities of 2\u20134 m\/s, eroding materials that are chemically resistant but mechanically soft. PTFE and FEP linings provide excellent acid resistance but wear through rapidly in high-solids service.<\/p>\n\n\n\n

    Why Standard Pumps Fail<\/h3>\n\n\n\n
    Pump Type<\/th>Fails Because…<\/th>Typical Service Life in Acid Slurry<\/th><\/tr><\/thead>
    316L Stainless Steel Centrifugal<\/td>Acid corrosion \u2014 pitting, crevice corrosion, stress corrosion cracking<\/td>1\u20133 months<\/td><\/tr>
    High-Chrome Alloy Slurry Pump<\/td>Acid dissolves the metal matrix; carbides remain but pump loses structural integrity<\/td>2\u20136 months<\/td><\/tr>
    Rubber-Lined Pump<\/td>Acid attacks rubber above 60\u00b0C; solids cut the rubber surface<\/td>1\u20134 months<\/td><\/tr>
    PTFE\/FEP-Lined Pump<\/td>Excellent acid resistance but rapid wear from abrasive solids \u2014 lining wears through<\/td>2\u20134 months in high solids<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    The material that survives must be simultaneously acid-resistant and abrasion-resistant. UHMWPE is one of the few materials that delivers both properties.<\/strong><\/p>\n\n\n\n

    2. What Materials Are Best for Acid Slurry Pumps?<\/h2>\n\n\n\n

    Material selection is the single most critical decision. The material must resist the specific acid used in the process at the operating temperature, while also withstanding the abrasive wear from entrained ore solids.<\/p>\n\n\n\n

    Acid Slurry Pump Material Comparison<\/h3>\n\n\n\n
    Material<\/th>Acid Resistance<\/th>Abrasion Resistance<\/th>Temperature Limit<\/th>Best Application<\/th><\/tr><\/thead>
    316L Stainless Steel<\/td>Poor in hot concentrated acid; acceptable for dilute, ambient acid<\/td>Moderate<\/td>~60\u00b0C in acid<\/td>Not recommended for primary acid slurry service<\/td><\/tr>
    High-Chrome Alloy (Cr27-Cr33)<\/td>Poor \u2014 acid attacks metal matrix<\/td>Excellent<\/td>~90\u00b0C<\/td>Not recommended for acidic service<\/td><\/tr>
    Natural Rubber Lining<\/td>Good in dilute acid at low temperature<\/td>Good for rounded particles; poor for sharp ore<\/td>~70\u00b0C<\/td>Limited \u2014 not for hot acid<\/td><\/tr>
    PTFE \/ FEP Lining<\/td>Excellent \u2014 universal acid resistance<\/td>Poor \u2014 soft, wears rapidly in high solids<\/td>~120\u00b0C (FEP)<\/td>Clean acid service only; not for slurries above 5% solids<\/td><\/tr>
    UHMWPE Lining<\/strong><\/td>Excellent \u2014 resists most acids, alkalis, and solvents<\/strong><\/td>Excellent \u2014 withstands up to 30% solid content<\/strong><\/td>~90\u00b0C<\/strong><\/td>Ideal \u2014 the primary material for acid slurry service<\/strong><\/td><\/tr>
    PFA Lining<\/td>Excellent \u2014 universal acid resistance<\/td>Moderate \u2014 better than PTFE, not as good as UHMWPE<\/td>~160\u00b0C<\/td>High-temperature acid with low to moderate solids<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Why UHMWPE Excels in Acid Slurry Service<\/h3>\n\n\n\n

    UHMWPE<\/a> (Ultra-High Molecular Weight Polyethylene) combines acid resistance with abrasion resistance through its unique molecular structure. The extremely long polymer chains create a material that is chemically inert to most acids, alkalis, and solvents, while providing abrasion resistance superior to steel. Key properties:<\/p>\n\n\n\n