重选-浮选联合工艺回收硫氧混合型矿石中的铜、金

Recovery of copper and gold from a sulfur-oxygen mixed ore by gravity-flotation combined process

老挝某硫氧混合型铜矿矿石铜品位1.23%,铜氧化率为26.02%,含金3.03 g/t,大部分金以粒间形式和包裹形式存在。矿石中含有10%明金,可采用重选将其预富集,硫化铜矿物及其它形式金矿物占比大,宜进行浮选。采用重浮联合流程对铜、金进行综合回收,避免明金的损失,获得技术指标为:重选精矿金品位高达915.50 g/t、金回收率12.09%;在活化剂采用硫化钠1000 g/t+硫酸铵500 g/t、捕收剂采用戊基黄药60 g/t+丁基铵黑药60 g/t最佳工艺参数条件下,浮选精矿中铜品位达27.48%、作业回收率为91.38%,金品位为59.25 g/t、作业回收率为90.93%,很好地实现了对铜、金的综合回收。

A sulfur oxygen mixed copper ore in Laos has a copper grade of 1.23%and a copper oxidation rate of 26.02%with gold of 3.03 g/t,mostly existing in intergranular and encapsulated forms.The ore contains 10%bright gold,which can be pre-enriched by gravity separation.Copper sulfide minerals and other forms of gold minerals accounting for a large proportion are suitable for flotation.Adopting a combined heavy flotation process for comprehensive recovery of copper and gold,the loss of clear gold can be avoided,and the technical indicators obtained are:the gold grade of the re-selected concentrate is as high as 915.50 g/t,and the gold recovery rate is 12.09%.Under the optimal process parameters of using 1000 g/t sodium sulfide and 500 g/t ammonium sulfate as activators with the collectors of 60 g/t pentyl xanthate and 60 g/t butyl ammonium black powder,the copper grade in the flotation concentrate reached 27.48%,the operating recovery rate was 91.38%,the gold grade was 59.25 g/t,and the operating recovery rate was 90.93%,which could achieve a comprehensive recovery of copper and gold.