P204/4PC新协萃体系萃取分离镍与锰镁钙

摘要 采用一种新的二元协萃体系P204/4PC对萃取分离镍与锰、镁、钙进行了研究.考察了有机相配比、平衡pH、平衡时间等因素对萃取分离的影响，并绘制了镍萃取与反萃等温线.结果表明，采用1.25mol/L 4PC(L)+0.25mol/L P204(HA)组成的有机相，经过5级模拟逆流萃取，镍的萃取率达到98.7%，其他杂质金属的萃取率基本都在5%以下.负载有机相经过三级逆流反萃，镍的反萃率达到98.2%，反萃后有机相中镍的质量浓度小于0.1g/L.
Abstract：The separation of nickel from manganese， magnesium and calcium by solvent extraction with new synergistic system was studied. The effects of organic phase ratio， equilibrium pH value and equilibrium time on extraction separation were investigated， and nickel extraction and stripping isotherms were plotted. The results showed that the organic phase composed of 1.25mol/L 4PC(L)+0.25mol/L P204(HA)was used after 5 levels of countercurrent extraction， the extraction rate of nickel reached 98.7%， and the extraction rate of other impurity metals were nearly below 5%. The loaded organic phase was subjected to a three-stage countercurrent stripping， the stripping rate of nickel reached 98.2%， and the content of nickel in the organic phase was less than 0.1g/L.