萃取法脱除工业级硫酸锰溶液中钙和镁离子

Removal of Ca and Mg Ions from Industrial Manganese Sulfate Solution by Solvent Extraction

以P507和羧酸A混合物为萃取剂,从工业级硫酸锰溶液中选择性萃取脱除钙和镁离子.考察硫酸锰溶液初始pH值、混合萃取剂(x(P507)∶x(羧酸型A)=1∶1)的体积分数、皂化率和相比等因素对萃取脱除钙、镁杂质的影响.实验结果表明,在硫酸锰溶液初始pH值2.3、混合萃取剂体积分数20%、皂化率20%、相比(O/A)2∶1、萃取温度30℃条件下,选择性地萃取脱除钙和镁离子,锰回收率为83.9%.脱除钙和镁的硫酸锰溶液用活性吸附,浓缩结晶并干燥,获得的一水硫酸锰产品符合电池级高纯硫酸锰的要求,钙和镁质量分数分别为38.4×10-6和41.7×10-6.

Ca and Mg ions were selectively removed from industrial manganese sulfate solution with mixture extractant of P507 and carboxylic acid A.The effects of parameters including initial pH of manganese sulfate solution,concentration and saponification of mixture extractant with mol ratio 1∶1of P507 and carboxylic acid A,and phase ratio（O/A）were determined.The results showed that Ca and Mg ions were selectively removed under the following conditions of initial pH 2.3of manganese sulfate solution,20%volume concentration of mixture extractant,20% saponification ratio,O/A=2∶1phase ratio at 3 0 ℃,and the yield of manganese reached 83.9%.By treating the solution with carbon adsorption,condensation crystallization and desiccation,manganese sulfate monohydrate with Ca content 38.4ppm and Mg content41.7ppm,which meets requirement of high-purity manganese sulfate,is obtained.