Deep Processing of Dump Slag from the Copper-Nickel Industry

This work proposes an environmentally safe and economically feasible method of waste copper-nickel production slag utilization (Kola Mining-Metallurgical Company, Nornickel, Kola Peninsula, Russia). process involves the decomposition by diluted solutions sulfuric acid (7–10 wt.% H2SO4) with a transfer in solution more than 70% silicon, 77% iron 78% magnesium, concentration non-ferrous metals residue (~70%). Copper ions were used leaching stage to prevent release hydrogen sulfide into working atmosphere. Dehydration solution, followed washing water-soluble sulphates from silica, was carried out separate silica solution. The dehydration temperature effect on structural characteristics determined. possibility recovering after extraction precipitation, form copper cementite, sum nickel cobalt sulfides, evaluated. Pigment-grade dioxide, magnesium sulphate aluminium hydroxide obtained base metals, calcination other operations. Sulfuric resulted disclosure grains encapsulated ferrosilicate, which is favorable factor for flotation. depleted can be successfully construction industry.