In the fields of hydrometallurgy and new energy materials, nickel sulfate is a core raw material for lithium battery cathode materials and the electroplating industry, and its purity directly determines the quality of end products. However, in industrial production, nickel sulfate solutions are often accompanied by free sulfuric acid, chloride ions, and heavy metal impurities, creating a highly corrosive acidic environment with a pH as low as 0.5–3. Under such harsh operating conditions, traditional extraction equipment frequently faces problems such as corrosion leakage, declining separation efficiency, and short service life.

The CWL-M Series Centrifugal Extractor independently developed by Zhengzhou Tiei Extraction Technology Co., Ltd. with its excellent strong-acid resistance and efficient extraction capability, has become key equipment in the nickel sulfate purification process, providing reliable support for the new energy industry chain.

Strong Acid Conditions: The Core Challenge of Nickel Sulfate Extraction

The nickel sulfate extraction process involves a multi-stage countercurrent operation—comprising steps such as iron and copper removal using P204, cobalt and magnesium removal using P507, and deep purification using C272. As the feed solution flows at high velocity and undergoes repeated contact within the equipment, this places extremely rigorous demands on the equipment's corrosion resistance and mechanical stability.

1.Strong Acid Corrosion: Free sulfuric acid reduces the solution pH to as low as 0.5. Ordinary carbon steel and 304 stainless steel equipment can develop surface corrosion and wall perforation within just a few weeks.
2.Synergistic Chloride Ion Attack: Under certain operating conditions, impurity ions form chloride-containing mixed acids, accelerating pitting corrosion and stress corrosion cracking.
3.Seal Failure Risks: Conventional sealing components rapidly age in strong acidic media, easily causing extractant leakage and cross-contamination of products.
4.High Maintenance Costs: Traditional equipment such as mixer-settlers and extraction columns often require major overhauls every 3–6 months due to insufficient corrosion resistance, severely affecting production continuity.

CWL-M Centrifugal Extractor: Triple Protection System Designed for Strong Acid Applications

The CWL-M Series Centrifugal Extractor developed by Zhengzhou Tiei Extraction Technology Co., Ltd. is specifically designed to overcome the strong acid corrosion challenges in nickel sulfate extraction. It establishes a triple technical protection system of “corrosion-resistant materials + anti-corrosion structural design + leak-proof sealing,” achieving long-term stable operation under extreme working conditions.

1.Professional Material Selection for Resistance to pH 0.5 Strong Acid Environments
Wetted Parts: Core components such as the rotating drum, mixing chamber, and feed solution flow channels are manufactured from Hastelloy C-276 or coated with silicon carbide ceramic layers, enabling long-term resistance to strong acid and alkali environments with pH values ranging from 0.5 to 14.
Main Structure: A composite structure combining 316L stainless steel and fluoroplastic materials not only ensures mechanical strength, but also isolates acidic media from corroding the metal substrate.
Suitable for Chloride-Containing Conditions: The specially engineered material combination performs exceptionally well in chloride-containing sulfuric acid systems, with no risk of pitting corrosion or crevice corrosion.
Verified Performance: In a strong acid medium with pH ＜1 and a temperature of 85°C, the CWL-M Centrifugal Extractor operated continuously for 12 months without corrosion leakage or coating peeling. Compared with traditional stainless steel equipment, the service life was extended by 3 times, while maintenance costs were reduced by 60%.

2.Optimized Structural Design to Reduce Corrosion and Wear
Smooth Flow Channel Transition: Reduces turbulence and scouring caused by high-speed liquid flow, lowering the risk of localized corrosion and abrasion.
Modular Quick-Disassembly Structure: Facilitates regular inspection and maintenance. Key component replacement can be completed without overall disassembly, significantly reducing downtime.

3.Advanced Sealing System to Eliminate Leakage and Contamination
Double-End Mechanical Seal: Combined with strong acid-resistant perfluoroether rubber (FFKM) sealing rings, ensuring zero leakage even under pressure fluctuations and temperature changes.
Independent Isolation Chamber: Physically separates the extraction area from precision components such as bearings and motors, preventing acidic vapor from corroding the transmission system.

Economic and Environmental Benefits: Supporting Green and Low-Carbon Production

The strong acid resistance of the CWL-M Centrifugal Extractor not only solves equipment corrosion problems, but also delivers significant economic and environmental benefits:

1.Reduced Operation and Maintenance Costs: Enhanced corrosion-resistant materials reduce the frequency of major equipment overhauls. A single unit can operate for more than 8,000 hours annually, avoiding production shutdown losses caused by equipment failure.
2.Reduced Chemical Consumption: Fluoroplastic and Hastelloy materials effectively resist extractant corrosion and reduce organic phase loss. Compared with traditional equipment, extractant consumption is reduced by more than 30%.
3.Environmental Compliance: The enclosed negative-pressure design effectively suppresses the volatilization of acidic exhaust gases, eliminating leakage, overflow, and dripping problems. This design meets the environmental protection requirements of chemical production and helps enterprises achieve green and low-carbon manufacturing.

At present, with the rapid development of the new energy industry, market demand for high-purity nickel sulfate continues to grow, making efficient extraction equipment for strong acid conditions an essential industry requirement. The CWL-M Centrifugal Extractor developed by Zhengzhou Tiei Extraction Technology Co., Ltd. successfully adapts to the extreme operating conditions of nickel sulfate extraction through its comprehensive anti-corrosion design in materials, structure, and sealing systems, achieving multiple advantages including efficient separation, stable operation, low consumption, and environmental protection.
Zhengzhou Tiei Extraction will continue to promote the upgrading and iteration of material technologies and intelligent control systems, further optimizing adaptability to strong acid operating conditions. The company is committed to providing stronger technical support for the production of high-purity nickel sulfate and other hydrometallurgical products, contributing to the high-quality development of the global new energy industry.
Email: sales@tieiextraction.com
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