液膜结晶法提取高锌低镉体系中镉的研究  

Recovering cadmium in the system of high concentration zinc and low concentration cadmium by liquid membrane crystallizing technique

作　　者：汤兵[1] 简弃非[2] 万印华[1] 王向德[1] 张秀娟[1] 

机构地区：[1]华南理工大学环境科学研究所 [2]华南理工大学交通学院

出　　处：《膜科学与技术》1999年第1期24-30,共7页Membrane Science and Technology

基　　金：高等学校博士学科点专项科研基金

摘　　要：建立了以ＤＩＰＳＡ（３，５－二异丙基水杨酸），ＴＩＢＰＳ（三烷基硫化磷）为载体，（ＮＨ４）２Ｓ为沉淀剂的液膜体系，利用液膜内相结晶技术处理湿法炼锌中氧化锌酸性浸出液．在最佳操作条件下，经一级液膜处理，镉的迁移率可达９８．６％，回收率达９８．１％，而锌的损失率不到１．０％．从高锌低镉体系中较好地实现了锌、镉的分离，并能在内水相中直接得到镉盐产品，同时可使料液得以很好的净化．A new liquid membrane system containing DIPSA,TIBPS as carriers,and introducing crystallizing technique in the internal aqueous phase by adding (NH 4) 2S as precipitating agent to produce CdS precipitate in it directly was reported in this paper.By this way a satisfactory separation result of recovering low concentration cadmium from high concentration zinc has been gotten.The feed used was sulfuric acid solution of zinc oxide in a zinc hydrometallugry.After one-stage of batch process under the optimum liquid membrane conditions obtained,98.6% transferring ratio,98.1% yielding ratio of cadmium have been attained with only less than 1.0% transferring ratio of zinc,moreover,the feed solution can be purified as well.

关 键 词：液膜 结晶 湿法炼锌 镉 膜分离 

分 类 号：TQ028.8[化学工程]