陕西某复杂含砷铜矿石选矿试验研究

Experimental Study on Beneficiation of an Arsenic-Bearing Copper Ore in Shaanxi Province

陕西某铜矿石属于含砷难选铜矿石,铜、砷、硫含量分别为0.74%、0.43%和1.54%,主要有用矿物是黄铜矿、辉铜矿,杂质矿物为毒砂和黄铁矿,矿石中铜砷矿物结合紧密,粒度较细,且矿物种类较多,嵌布关系复杂,普遍相互包裹,有用矿物单体解离较困难。为确定该矿石的选矿工艺进行了选矿试验研究。结果表明,矿石采用抑砷浮铜的优先浮选工艺流程处理,以石灰为含砷矿物抑制剂,获得了铜品位为25.27%、含砷0.085%、含金0.23 g/t、含银40.52 g/t、铜回收率为92.72%的铜精矿,尾矿铜品位为0.053%。铜精矿产品质量达到国家六级品标准,试验指标较理想。

An arsenic-bearing copper ore in Shaanxi Province contains 0.74%copper,0.43%arsenic and 1.54%sulphur.The main useful minerals are chalcopyrite,chalcocite,and the impurity minerals are arsenopyrite,and pyrite.The complex dissemination relationship of copper and arsenic are closely combined and fine encapsulated among many minerals cause great difficulty of copper ore to be liberated.The beneficiation experiment was carried out and the test results showed that good indexes could be obtained.Using the preferential flotation flow and the lime as the inhibitor to suppressing arsenic and floating copper,the ideal copper concentrate contained 25.27%Cu,0.085%As,0.23 g/t Au and 40.52 g/t Ag with copper recovery of 92.72%,and flotation tailing contained 0.053%Cu was obtained respectively.The results of the copper concentrate grade up to the national level six standard shows that the process is feasible.