With the evolution of lithium-ion battery cathode materials toward high-nickel ternary systems, extremely stringent purity requirements have been imposed on manganese sulfate—where the mass fractions of impurities such as potassium, sodium, calcium, and magnesium must be controlled below 5.0×10⁻³%. Traditional impurity-removal processes such as crystallization, electrolysis, and chemical precipitation suffer from drawbacks like low recovery rates, high energy consumption, and serious pollution, making them difficult to meet the needs of large-scale industrial production. Although solvent extraction has shown potential in laboratory studies, its industrial application is restricted by bottlenecks such as low mass transfer efficiency, phase separation difficulties, and significant operational fluctuations.
The emergence of the CWL-M series centrifugal extractor has opened up a brand-new technological pathway for the industrial production of high-purity manganese sulfate. By harnessing a high-speed centrifugal field to intensify mass transfer, enabling multi-stage counter-current continuous operation, and ensuring highly efficient phase separation, it achieves the deep and efficient removal of calcium and magnesium impurities, while significantly improving manganese recovery rates and product consistency.
Technical Advantages: A Dual Breakthrough in Efficiency and Precision
Compared with traditional mixer settlers and reactors, the CWL-M centrifugal extractor offers the following core advantages:
1.Extremely High Mass Transfer Efficiency: Under the action of centrifugal force, the contact area between the two phases is greatly increased, enabling efficient extraction within a very short residence time.
2.Clear Stage Separation: Prevents flooding and entrainment, ensures minimal organic phase loss, and delivers strong operational stability.
3.High Degree of Automation: Supports continuous operation, reduces human operational variation, and aligns well with the requirements of intelligent manufacturing.
4.Flexible and Scalable: With throughput ranging from 10 L/h to 80 m³/h, it can be adapted for different stages from lab-scale trials to full-scale production.
Experimental Verification: From Parameter Optimization to Industrial Feasibility
Systematic experiments have demonstrated the outstanding performance of the CWL-M centrifugal extractor in manganese sulfate purification:
Extraction Stage: Under feed conditions of Mn concentration at 29.51 g/L and an organic-to-aqueous ratio (O/A) of 3:1, four-stage counter-current extraction achieved a manganese extraction rate of 98%.
Impurity Removal by Washing: Multi-stage counter-current washing with dilute sulfuric acid at pH = 4 effectively controlled calcium and magnesium impurities while maintaining high manganese recovery.
Stripping and Recovery: Using 3 mol/L sulfuric acid for three-stage stripping, the final strip liquor contained Mn²⁺ at 9.16 g/L, with magnesium and calcium concentrations reduced to 3.34 mg/L and 2.19 mg/L respectively—fully meeting the standards for battery-grade manganese sulfate.
The overall manganese recovery rate reached 93.12%, while magnesium and calcium removal efficiencies exceeded 99.75% and 99.59% respectively, highlighting the extractor’s remarkable effectiveness in deep elemental separation.
Application Prospects: Injecting New Momentum into the Lithium Battery Materials Industry Chain
CWL-M centrifugal extraction technology is not only suitable for manganese sulfate purification but can also be extended to the extraction and purification of other battery metals such as cobalt, nickel, and lithium, demonstrating broad industry adaptability. Its green, low-carbon, and energy-efficient features also align perfectly with the dual requirements of intelligent manufacturing and sustainable development.
At present, this technology has successfully completed pilot-scale verification in several leading cathode material enterprises and is now being advanced toward full industrial application. It provides a reliable technological guarantee for the large-scale and cost-efficient production of high-purity battery materials.
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