云南某含银铜矿石浮选试验

Experimental Study on Flotation of a Silver-bearing Copper Ores in Yunnan

云南某含银铜矿石铜品位为0.78%,银品位为70.27 g/t,硫品位为19.83%。为了高效开发利用该矿石资源,在工艺矿物学研究的基础上进行了浮选试验研究。结果表明:①矿石中的铜主要以黄铜矿的形式存在,嵌布粒度粗细变化较大,以中粗粒为主,主要粒度为1~0.01 mm,80%以上分布在0.45~0.019 mm粒级;黝铜矿嵌布粒度微细,85%以上分布在-0.037 mm粒级;银主要赋存在黝铜矿中;硫主要以黄铁矿的形式存在。②矿石在磨矿细度为-0.074 mm占80.3%情况下采用2粗1扫流程混浮铜硫,铜硫混合精矿在磨矿细度为-0.037 mm占73.8%情况下1粗2精1扫流程分离铜硫,可获得铜品位为22.37%、铜回收率为90.28%、含银1221.51 g/t、银回收率为54.72%的铜精矿,以及硫品位为41.86%、硫回收率为90.12%、含银55.75 g/t、银回收率为33.87%的硫精矿,较好地实现了铜、硫、银的分离与富集。

A silver-bearing copper ore in Yunnan is with copper grade of 0.78%,silver grade of 70.27 g/t and sulfur grade of 19.83%.Flotation tests were carried out based on the process mineralogy research in order to develop and utilize the resources efficiently.The results showed that:①Copper in the ore mainly exists in the form of chalcopyrite,and the disseminated grain size varies greatly with medium and coarse grains as the main grain size,ranging from 0.01 mm to 1 mm.More than 80%of the ores particles distribute in the grain size ranging from 0.019 mm to 0.45 mm.Tetrahedrite shows fine-disseminated,with more than 85%of which distribute in the-0.037 mm grain size.Silver mainly occurs in tetrahedrite and sulfur mainly exists in the form of pyrite.②When the grinding fineness of the ore is-0.074 mm accounting for 80.3%,copper and sulfur mixed concentrate was obtained by the two roughing-one scavenging process.When the grinding fineness of the copper and sulfur mixed concentrate is-0.037 mm accounting for 73.8%,copper and sulfur were separated by the one roughing-two cleaning-one scavenging process.Copper concentrate with copper grade of 22.37%,copper recovery rate of 90.28%,silver content of 1221.51 g/t and silver recovery rate of 54.72%was obtained.Sulfur concentrate with sulfur grade of 41.86%,sulfur recovery rate of 90.12%,silver content of 55.75 g/t and silver recovery rate of 33.87%was obtained.The separation and enrichment of copper,sulfur and silver were well realized.