Method for recovering lead, copper and arsenic from white smoke dust

The invention discloses a method for recovering lead, copper and arsenic from white smoke dust. The method specifically comprises the following steps that the white smoke dust is brought into ammoniawater for ammonia leaching treatment, pressurizing and filtering are carried out, an obtained solid is washed to obtain lead mud, then high-pressure hydrogen reduction treatment is carried out on a filtrate, an obtained solid is washed and dried to obtain copper powder, then lime is added into the filtrate obtained in the previous step, arsenic precipitation and ammonia water regeneration treatment are carried out, namely the lime is added for reaction, filtering is carried out on an obtained product after the reaction is ended, wherein the filtered filtrate is used as the ammonia water in thesteps in a cyclic mode, a filtered solid is washed and dried to obtain calcium arsenate, finally vacuum carbon reduction treatment is carried out on the calcium arsenate, and reactants are separatedto obtain calcium oxide and the metal arsenic. According to the method, metal in white smoke dust generated in the nonferrous metal smelting process is recovered, so that the environmental pollution is reduced, and recovery of the valuable metal and cyclic utilization of resources are realized.