As the positive electrode materials of lithium-ion batteries develop towards a ternary system with high nickel and low impurities, the purity requirements for manganese sulfate are becoming increasingly stringent. Traditional preparation methods such as crystallization, electrolysis and chemical precipitation have problems such as low recovery rate, high energy consumption and complex process, which are difficult to meet the needs of industrial production. Solvent extraction has become a research hotspot due to its advantages such as short process, high efficiency and low energy consumption. Zhengzhou Tiei Extraction has successfully achieved the efficient preparation of battery-grade manganese sulfate through centrifugal extraction technology, providing a reliable solution for industrial production.
Advantages of Centrifugal Extraction Technology
The centrifugal extractor has significant advantages in the preparation of manganese sulfate due to its unique structure and working principle:
1.Efficient mass transfer and rapid phase separation: Under the action of centrifugal force, the contact area between the two phases increases, the mass transfer efficiency is improved, and the phase separation time is shortened to seconds, which greatly improves production efficiency.
2.Continuity and automation: The equipment can realize multi-stage countercurrent continuous operation, reduce manual intervention, and is suitable for industrial large-scale production.
3.Low loss and high recovery rate: Compared with traditional mixer settler, centrifugal extractor has less organic phase retention, reduced loss, and significantly improved metal recovery rate.
4.Flexible adaptability: The equipment specifications cover a processing capacity of 10 L/h to 80 m³/h, and can be flexibly selected according to needs.
Centrifugal Technology Breakthrough
The Extraction Application Center of Zhengzhou Tiei Extraction uses Mn-containing liquid as raw material and optimizes the centrifugal extraction process parameters to achieve efficient separation of Mn²⁺ from impurities Ca²⁺ and Mg²⁺:
1.Extraction stage: When the Mn concentration of the feed liquid is 29.51 g/L and the extraction phase ratio (O/A) is 2.0:1.0, the 4-stage centrifugal extraction rate can reach 75%~81%. After increasing O/A to 3.0:1.0, the extraction rate jumped to 98%, solving the efficiency bottleneck caused by saturation of traditional equipment.
2.Washing and stripping stage: Using 4-stage centrifugal washing (pH=4 dilute sulfuric acid) and 3-stage stripping (3 mol/L H₂SO₄), the Mn²⁺ concentration in the stripping liquid reached 9.16 g/L, and the Mg²⁺ and Ca²⁺ concentrations dropped to 3.34 mg/L and 2.19 mg/L, respectively, which are far lower than the battery grade standard (impurities <5.0×10⁻³%).
The whole process Mn recovery rate is 93.12%, and the Mg²⁺ and Ca²⁺ removal rates are both over 99.5%, which is significantly better than the traditional method.
Centrifugal extraction technology provides three core values for battery-grade manganese sulfate production
1.Reduce costs and increase efficiency: shorten reaction time, reduce organic phase loss, and reduce comprehensive costs by more than 20%.
2.Green and environmentally friendly: closed-loop process reduces wastewater discharge and meets the requirements of sustainable development.
3.Quality assurance: The product purity is stable and can meet the strict standards for impurity control of high-end lithium battery positive electrode materials.
At present, this technology is very mature. Enterprises can choose CWL-50M, CWL-650M and other models of equipment according to their production capacity requirements to achieve seamless connection from laboratory to 10,000-ton production.
Centrifugal extraction technology has successfully solved the pain points of industrial production of battery-grade manganese sulfate through process innovation and equipment upgrades, providing high-purity raw material guarantees for the lithium battery industry chain. As the new energy industry continues to increase its requirements for material purity, this technology is expected to become the mainstream choice for manganese sulfate purification, driving the entire industry towards efficiency and greenness.
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