刚果(金)MSESA矿体崩积物的酸浸工艺优化及经济性评价OA

In order to expand the development boundary of overseas low-grade copper-cobalt oxide ore,the leaching of copper and cobalt with sulfuric acid was studied for the Colluvium of MSESA orebody in Congo(DRC).The effects of various key factors on the leaching were investigated,and the economy of the process was evaluated and analyzed.The results show that the contents of copper and cobalt in the colluvium are 1.1％and 0.15％,respectively.The oxidation rate of the ore is high and the argillization is serious.The main gangue phases are talc,biotite,quartz,chlorite and dolomite.Copper mainly exists in the form of oxide,and cobalt exists in the form of cobaltite,cobalt carbonate and cobalt in gangue.Under the conditions of grinding fineness of 70％(-200 mesh),sulfuric acid addition of 7％,leaching temperature of 25℃,leaching time of 2 h,liquid volume to solid mass ratio of 2.5∶1,and stirring rate of 300 r/min,the leaching rates of copper and cobalt are 88.72％and 71.75％,respectively,and the acid consumption is 5.43 t/tCu.Cathode copper is produced by leaching-extraction-electrowinning process.The production cost is $ 3 450.618/tCu,accounting for only 36.322％of the sales price of cathode copper,which has good economic benefits.