铜再生烟灰浸出液净化试验

Study on Purification of Recycled Copper Soot Leachate

铜再生灰浸出液中含有Cu、Zn、Fe、Cd等多种有价金属。采用“Lix984+磺化煤油”有机相从铜再生灰浸出液中萃取分离铜,并采用中和除铁法对萃余液中的铁沉淀分离。探究了萃取级数、萃取相比O/A、萃取剂浓度、水相初始pH、萃取时间对Cu与其它金属离子萃取分离的影响,以及溶液pH、反应温度、反应时间对萃铜余液除铁过程的影响。萃铜试验优化条件为:萃取级数2级、萃取相比3:4、萃取剂浓度15%、萃取时间2 min、萃取初始水相pH=1.5。除铁试验最佳参数为:中和终点pH=4.0、反应温度40℃、陈化时间1 h。在最佳条件下,Cu的萃取率为99.12%,与Zn、Cd、Fe的分离系数分别为1317.9、1178.7和651,实现Cu与其它金属的有效分离。萃铜余液除铁率达99.67%,除铁后液满足锌电解液对Fe浓度的要求。

The leachate of recycled copper soot contains various valuable metals such as Cu,Zn,Fe,Cd,etc.Copper was extracted and separated from the leachate with“Lix984+sulfonated kerosene”organic phase,and iron in raffinate was removed by neutralization iron-removal method.Effects of extraction series,phase ratio O/A,extractant concentration,initial pH value of water phase,and extraction time on extraction of Cuand separation with other metal ions were explored.Effects pH value of stripping solution,reaction temperature,and reaction time on iron removal from copper raffinate were investigated.The optimum conditions obtained in copper extraction experiment includes extraction series of 2,O/A=3:4,extractant concentration of 15%,extraction time of 2 min,and initial pH value of water phase of 1.5.The optimal process parameters of iron removal experiment include pH value of end point of neutralization of 4.0,reaction temperature of 40℃,and reaction time of 1 h.Under the optimum conditions,extraction rate of Cu is 99.12%,and separation coefficient of Cu and Zn,Cd and Fe is 1317.9,1178.7 and 651,respectively,which the effective separation of Cu from other metals is realized.Iron removal rate of copper extraction residue is 99.67%,and the iron removal liquid meets the concentration requirements of zinc electrolyte for Fe.