(四川大学 化工学院， 成都 610065)
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36～60倍，同时使锌的回收率达到88%～90%。
关键字: 高硅锌焙砂； 硅胶聚沉； 锌冶金
high-silica containing zinc calcine
（College of Chemical Engineering， Sichuan University，
Chengdu 610065， P.R.China）
Abstract: The effects of pH values， stationary state time， addition of Fe3+ 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.
Key words: high-silica containing zinc calcine; silica gel aggregation; zinc metallurgy
