用Cyanex 302萃取废三元正极材料浸出液中铁铜试验研究

Extraction of Ferrum and Copper from Leaching Solution of Spent Ternary Cathode Material by Cyanex 302

研究了用Cyanex 302(主要成分为二(2,4,4-三甲基戊基)单硫代次磷酸)萃取分离废三元正极材料浸出液中的铁和铜,考察了H+浓度、萃取剂浓度、温度对Cyanex 302萃取分离性能的影响,确定了反萃取负载有机相中铁、铜的工艺条件,在此基础上设计了从废三元正极材料浸出液中萃取铁和铜的工艺流程。结果表明:最佳萃取条件为Cyanex 302浓度0.1 mol/L,H^(+)浓度0.1 mol/L,室温;在该条件下,铁、铜萃取率均大于99.9%,镍、钴、锰、锂萃取率均低于0.003%;铁的最佳反萃取剂为1 mol/L H_(2)SO_(4),铜的最佳反萃取剂为1.5 mol/L HNO_(3)。该工艺能有效萃取分离浸出液中的铜、铁。

The extraction and separation of ferrum and copper from waste ternary cathode material by Cyanex 302(the main component is di(2,4,4-trimethylamyl)monothiophosphoric acid)was studied.The effects of H+concentration,extractor concentration and temperature on the extraction and separation performance of Cyanex 302 were investigated.And the technological conditions for the stripping of ferrum and copper in supported organic phase were determined.The process flow of extracting ferrum and copper from waste ternary cathode material leaching solution is designed.The results show that the optimal extraction conditions are 0.1 mol/L Cyanex 302 concentration,0.1 mol/L H^(+)concentration,room temperature.Under these conditions,the extraction rates of ferrum and copper are over 99.9%,while the extraction rates of Ni(Ⅱ),Co(Ⅱ),Mn(Ⅱ),and Li(Ⅱ)are all below 0.003%.The optimal stripping agent for ferrum is 1 mol/L H_(2)SO_(4),and that for copper is 1.5 mol/L HNO_(3).The process can effectively separate copper and ferrum from the leaching solution.