高砷高锡铅阳极泥脱砷与综合回收工业试验

Pilot test of arsenic removal and comprehensive recovery from high As,Sn and Pb bearing anode slime

在前期高砷高锡铅阳极泥脱砷及资源综合回收小试、扩大试验基础上,设计建造了3 t/d的高砷高锡铅阳极泥综合回收中试生产线。在碱料比(碳酸钠与阳极泥质量比)0.8、焙烧温度600℃、焙烧时间2.2 h、液固比(mL/g)3、浸出温度80℃、浸出时间2 h条件下实现了砷锡分离。浸出渣为锡铅锑渣,浸出液在80℃下蒸发结晶得到粗砷酸盐产品。产品锡铅锑渣含锡32.66%、铅12.65%、锑14.75%,粗砷酸盐中砷酸钠的纯度达到57.3%、含12个结晶水。高砷高锡铅阳极泥综合回收中试实现了阳极泥中砷和有价金属的分离回收,对于环境保护及资源的综合利用具有重要的现实意义。

On the basis of the bench-scale and pilot experiments of As removal and resource comprehensive recovery from high As,Sn and Pb bearing anode slime,a 3 t/d pilot production line for comprehensive recovery of high As,Sn and Pb bearing anode slime was designed and constructed.The separation of As and Sn was achieved under the conditions of alkali ratio 0.8,roasting temperature 600℃,roasting time 2.2 h,liquid-solid ratio(mL/g)3,leaching temperature 80℃and leaching time 2 h.The leaching residue contains Sn,Pb and Sb,and the coarse arsenate product is obtained by evaporation crystallization of the leaching solution at 80℃.The results show that the leaching residue contains Sn 32.66%,Pb 12.65%and Sb 14.75%.The sodium arsenate has a purity of 57.3%and contains 12 crystalline water.The pilot test of comprehensive recovery of high As,Sn and Pb bearing anode slime has realized the separation and recovery of As and valuable metals in anode slime,which has important practical significance for environmental protection and comprehensive utilization of resources.