Corrosion Resistant Centrifugal Pump for Alumina Solution

Project Overview

This project demonstrates the successful application of a corrosion resistant centrifugal pump in an Australian aluminum production facility.

The plant has an annual output of 300,000 tons of electrolytic aluminum, supported by a complete alumina dissolution and purification system.

Due to the highly alkaline and high-temperature operating conditions, the pumping system required exceptional corrosion resistance, zero leakage, and long-term operational stability.

Operating Conditions

Trung bình: Alumina solution
Chemical composition: Sodium hydroxide (NaOH) 18%–20%
Operating temperature: 80–100°C
Flow rate: 120 m³/h
Head: 60 m

Requirements:

Strong resistance to high-concentration alkali
No leakage during continuous operation
Stable performance under high-temperature conditions
These conditions place high demands on a corrosion resistant centrifugal pump, particularly in material durability and sealing reliability.

Pump Selection Solution

Changyu CYH100-65-250 Corrosion Resistant Centrifugal Pump

CYH Series Stainless Steel Centrifugal Pump for Caustic Soda

After technical evaluation, the project selected the Changyu CYH100-65-250 corrosion resistant centrifugal pump, designed for aggressive chemical and slurry transfer applications.

Design Features

Pump material
- The pump casing and impeller are manufactured from 1Cr18Ni9Ti stainless steel, offering excellent resistance to strong alkali corrosion and ensuring long service life in alumina solution service.
Hydraulic design
- The internal flow passage is optimized through CFD-based hydraulic design to reduce the risk of alumina crystallization and blockage.
- A backward-curved impeller improves hydraulic efficiency and lowers energy consumption.
Sealing system
- The pump is equipped with a silicon carbide mechanical seal, ensuring stable operation and achieving zero leakage, meeting strict environmental and operational safety requirements.

Application Results

After being put into continuous operation, the corrosion resistant centrifugal pump delivered stable and measurable performance improvements:

Corrosion resistance performance
- The pump operated continuously for 24 months with no corrosion or scaling observed on the pump casing or impeller. Alumina solution purity remained fully compliant with process requirements.
Leakage control
- The sealing system achieved zero leakage, preventing environmental contamination and eliminating damage to surrounding equipment.
Energy efficiency improvement
- The pump reached a hydraulic efficiency of 75%, reducing overall energy consumption by 20%.
- Annual electricity cost savings reached approximately USD 25,000.
Maintenance optimization
- Maintenance intervals were extended to once per year, reducing overall maintenance costs by 60%.

CYH Series Corrosion Resistant Centrifugal Pump

The CYH series corrosion resistant centrifugal pump is designed for industrial applications involving corrosive, high-temperature, and abrasive media.

Technical Specifications Range

Material options: Stainless steel (304 / 316 / 316L)
Operating temperature: -20°C to 180°C
Flow rate range: 2 m³/h – 400 m³/h
Head range: 5 m – 130 m
Power range: 0.55 kW – 110 kW
Speed: 1450 r/min – 2900 r/min

Advantages

Strong corrosion resistance for alkaline and corrosive liquids
CFD-optimized hydraulic structure for higher efficiency and lower energy consumption
Silicon carbide mechanical seal with low leakage risk and long service life
Compact structure, stable operation, and energy-saving design

Product Showcase of Different Models in the CYH Series

Project Conclusion

This Australian project confirms that a properly engineered corrosion resistant centrifugal pump can operate reliably under high-temperature and high-alkali alumina solution transfer conditions.

By combining corrosion-resistant materials, optimized hydraulic design, and a high-performance sealing system, the Changyu CYH series provides a stable, energy-efficient, and environmentally safe pumping solution for alumina refineries and aluminum production facilities.

If you’re currently facing the same issue, you can reach out to us right now. Our professional team is ready to provide you with a perfect solution.

Email: jade@changyupump.com

Điện thoại: +86-13651913727

Câu hỏi thường gặp

Q1: What type of pump is suitable for transferring alumina solutions with high alkali concentration?

A1: A Changyu industrial slurry pump designed for high-temperature and highly alkaline alumina solutions can handle NaOH concentrations of 18–20% at up to 100°C. It ensures stable operation and prevents corrosion in continuous service.

Q2: Why is corrosion protection important for pumps handling sodium hydroxide solutions?

A2: Sodium hydroxide is highly corrosive, which can damage standard pumps over time. Using a high-alkali resistant pump like Changyu’s solution ensures long-term durability, prevents scaling, and maintains solution purity.

Q3: How can pumps prevent leakage in harsh chemical transfer applications?

A3: By using a mechanical seal with silicon carbide, pumps like Changyu’s achieve zero leakage, even when transferring corrosive and high-temperature alumina solutions. This protects equipment and the surrounding environment.

Q4: What materials are recommended for pumps in alumina refineries?

A4: Materials such as 1Cr18Ni9Ti stainless steel, 304, 316, and 316L provide excellent corrosion resistance in high-alkali, high-temperature environments. Changyu pumps utilize these materials for both impeller and pump casing.

Q5: How does hydraulic design improve pump efficiency and prevent blockage?

A5: Optimized CFD flow passages reduce the risk of alumina crystallization, and backward-curved impellers improve hydraulic efficiency. In this project, Changyu pumps achieved 75% hydraulic efficiency while transferring alumina solutions.

Q6: What operational benefits can industrial plants expect from specialized pumps?

A6: Using a high-performance slurry pump for alumina solution transfer, as in this Australian project, can reduce energy consumption by 20%, save approximately USD 25,000 per year in electricity costs, and extend maintenance cycles to once per year, lowering overall operational costs.