浸出高硅锌焙砂中硅胶聚沉的规律  

Silica gel aggregation under acidic leaching of high-silica containing zinc calcine

作　　者：李锋[1] 金作美[1] 王励生[1] 

机构地区：[1]四川大学化工学院,成都610065

出　　处：《中国有色金属学报》2001年第6期1114-1117,共4页The Chinese Journal of Nonferrous Metals

基　　金：四川省基金资助项目 ( 986 97)

摘　　要：考察了 pH值、静置时间、CaO快速中和以及添加Fe3 + 离子对浸出高硅锌焙砂时硅胶聚沉的影响。发现pH =2 .0～ 4.8是硅胶的稳定区 ,此时浸出液过滤十分困难。加速硅胶聚沉以提高过滤速率的有效方法是 :用CaO或锌焙砂快速中和越过 pH =2 .0～ 4.8范围 ,以达到 pH =5 .0～ 5 .5 ;延长静置时间 ;在浸出锌焙砂时加入带有相反电荷的胶体 ,均有利于硅胶的聚沉。实验条件下可使Zn浸出液和硅胶聚沉物分离的过滤速率提高 36～ 6 0倍 ,同时使锌的回收率达到 88%～ 90 %。The effects of pH values, stationary state time, addition of Fe 3+ ion and CaO fast neutralization on the polymerisation and aggregation behavior of silica gel under acidic leaching of high silica containing zinc calcine were investigated. It is found that the dissolved silica is present as a stable colloidal solution at pH around 2.0～4.8 . During above pH area the filterability of the slurry is greatly reduced. Several effective methods to speed silica aggregation in order to precipitate readily filterable silica were developed, in which 88%～90% zinc recovery was achieved.

关 键 词：高硅锌焙砂 硅胶聚沉 炼锌 

分 类 号：TF813[冶金工程—有色金属冶金]