Pyro-metallurgical copper production is characterized by the formation of a large amount of slags. The copper content in the smelt slag is 0.5-2 %, in the vessel slag - about 5%, which often exceeds the copper content in the mined ores (about 1%). This makes depletion of slag a necessary operation in the pyro-metallurgical production of copper. In addition, about 110 million tons of copper slags have been accumulated in the dumps of copper factories in the Urals. The processing of these slags which contain up to 2.5% Cu is a very important task, the solution of which will allow extracting copper and reducing the areas occupied by the dumps.