高硅锌精矿的处理方法

Method for Processing Siliceous Zinc Ores

介绍了处理高硅锌精矿的方法。锌精矿中的二氧化硅在焙烧时反应生成硅酸锌 ,在浸出时溶于硫酸溶液中 ,然后缓慢沉淀析出。如果工艺条件控制不当 ,析出的胶态氧化硅可能形成无法过滤的胶体。根据试验结果认为 ,应通过加速沉淀析出反应的方法 ,控制浸出反应槽中二氧化硅浓度≤ 5 g/ L(最佳浓度为≤ 2 g/ L)。本文提出的方法可以使二氧化硅以易于液固分离的形式沉淀 ,无需添置大型过滤设备 ,并且通过向浸出反应槽加入经预先调整 Si O2 含量的混合物 。

This paper describes a method for processing high silicate zinc concentrates by hydrometallurgical zinc refining. Silica in concentrates reacts to form zinc silicate during roasting. The zinc silicate readily dissolves and slowly precipitates in sulfuric acid solutions during leaching. However, if proper operating parameters are not maintained, the colloidal silica may form an unfilterable gel. That is, according to the investigation results obtained, the silica concentration in the reactor has to be maintained at 5 g/L or less(preferably 2 g/L or less) by promoting the precipitation reaction. The proposed method has made it possible to precipitate silica in a form having excellent solid liquid separation characteristics, without the need for facilities having a high filtration capacity, and to maintain a low silica concentration in the reactor by feeding a composition containing pre adjusted silica contents.