祁雨沟矿区浮尾摇床重选精矿处理工艺研究

Study on Treatment Technology of Gravity Separation Concentrate by Shaker from Flotation Tailing in Qiyugou Mining Area

祁雨沟矿区选矿厂的摇床重选精矿总体粒度较粗,粒度集中区间为0.90~0.10 mm,金在0.90~0.45 mm粒级有明显的富集现象;试样中金属矿物以黄铁矿为主,金主要以连生金的形式存在,其次是硫化物包裹金和单体金,含量分别为57.86%、30.70%和11.21%;金矿物主要呈浑圆状,少量金矿物表面嵌连有脉石矿物。为了高效回收其中的金,进行了选矿流程试验,结果表明,试样在磨矿后再进行浮选比不磨矿直接摇床重选和磨矿后尼尔森重选效果好,可获得金品位为27.90 g/t、回收率为58.39%的精矿。现场以探索试验结果为依据,并参考类似矿山的生产实践进行了工艺流程优化改造,即将摇床重选精矿直接返回球磨机,这样大大简化了工艺流程。

The overall particle size of the gravity separation concentrate by shaker of Qiyugou concentrator is coarser,the particle size concentration range is 0.90~0.10 mm,and the gold is obviously enriched in 0.90~0.45 mm.The metal minerals in the samples are mainly pyrite,and the gold mainly exists in the form of auxogenous gold,followed by sulfide coated gold and monomer gold,the content of which are57.86%,30.70%and 11.21%,respectively.The gold minerals are mainly round,and gangue minerals are embedded on the surface of a few gold minerals.In order to recover gold efficiently,the beneficiation process test was carried out.The results showed that flotation after grinding is better than direct shaker gravity separation without grinding and Knelson gravity separation after grinding,and the concentrate with gold grade of 27.90 g/t and recovery rate of 58.39%can be obtained.On the basis of the experimental results and the production practice of similar mines,the process flow optimization was carried out,that is,the gravity separation concentrate was directly returned to the ball mill,which can greatly simplify the process flow.