After optional preliminary treatment, solid wastes are processed in accordance with the flowsheet Fig. 1 : first, Cu is leached selectively with a leaching solution containing Cu(II) ammine as a leachant according to the autooxidation or the autocatalystic action which proceeds depending on the equations:andand the CU(II) ammine concentrated in the leaching solution is extracted with a solvent Lix-54 ; thereafter, Cu2+ is stripped so that it moves into a Cu electrolyte and Cu electrowinning is performed to have metallic Cu deposited at the cathode, with the total process being carried out in a closed circuit. By this process, copper and other nonferrous metals can be selectively recovered from motor scrap and shredded solid wastes such as abandoned automobiles and home electric appliances in a simple and economical manner.
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