China Nonferrous Metallurgy

At present, when dealing with copper-nickel alloy, the pyrometallurgical process has the problems of repeated smelting of materials, large turnover, dispersion of precious metals and low recovery rate; The hydrometallurgy process has the problem of difficult separation of copper and nickel in the full immersion solution. Based on the analysis of the composition of copper-nickel alloy, this paper carries out experimental research on copper-nickel alloy produced by the nickel smelter. In the first stage, CuSO4 was used as the leaching agent to convert nickel and nickel sulfide into nickel ions into solution, while copper ions form precipitates and enter the residue. In the second stage, sulfuric acid was added to the leaching residue and oxygen was introduced to leach copper and copper sulfide, and precious metals were enriched in the residue. The three-stage process concentrates and crystallizes the copper sulfate solution. The results show that the total residue yield is 4.61%, the total leaching rate of copper is 99.19%, the total leaching rate of nickel is 99.43%, and the enrichment multiple of precious metals is 21.69. The copper leaching solution was concentrated and crystallized, and the purity of copper sulfate crystal was 98.35%, which met the first-class standard requirements of copper sulfate crystal products. The process has less reagent consumption and no wastewater discharge. It is a green metallurgy process and has promotion value.