The application of pressure leaching technology in the treatment of high-copper and high-arsenic dust was studied.The pressure leaching technique was determined as follows:the liquid to solid ratio(mL/g)of 5:1,the leaching temperature of 453 K,the retention time of 2 h,the initial sulfuric acid concentration of 0.74 mol/L,the oxygen partial pressure of 0.7 MPa,and the agitation speed of 500 r/min.Under these conditions,95%of copper and 99%of zinc and only 6%of iron in the dust were leached,while about 20%of arsenic was also leached.The leaching technique was optimized further to restrain the leaching of arsenic by adding a small quantity of ferrous iron into the leaching system(c(Fe2 +)=0.036 mol/L).Copper and zinc can be effectively separated from arsenic and iron in the leach.The optimal pressure leaching technique of high-copper and high-arsenic smelter dust is proved to be effective.
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