湿法冶锌中回收铟除铁液膜分离技术的研究

Liquid membrane separation technique for removal of iron during the successive recovery of indium in zinc hydrometallurgy

在湿法冶锌中,杂质铁干扰铟的回收,采用液膜分离技术可在回收铟的同时除铁,试验结果表明:在硫酸体系中,铁的液膜迁移速率比铟慢,通过控制合适的条件,可使铁不进入内水相,从而达到提纯和富集铟的目的,最佳操作条件如下:内水相为6mol/L HCl;V_(乳液):V_(外水相)=1:5,V_(油相):V_(内水相)=2:1;提取时间为8～10min。

Iron impurity affects retrieva1 of indium in zinc hydrometallurgy. With the liquid membrane separation technique, indium is not only recovered, but also iron is removed. The research shows that, in a sulfuric acid system, iron mobility in liquid membrane is much slower than indium mobility. In proper conditions, iron is left in external aqueous phase, and indium comes into internal aqueous phase, so indium is separated off iron, then is con- centrated. An optimum operation used for this purpose is as follows: Internal aqueous phase is 6 mol/L HCl; The volume ratio of emulsion to external aqueous phase is one to five; The volume ratio of oil phase to internal aqueous phase is two to one; Extraction time is 8--10 min.