Abstract:Address to the by-product sulfuric acid in the pyrometallurgical smelting process of copper sulfide concentrate is difficult to be applied on a large scale in the unsalable area of sulfuric acid, the oxygen pressure leaching process of copper sulfide concentrate was studied. The composition, phase and occurrence state of valuable elements of a copper sulfide concentrate raw material were analyzed. The feasibility of oxygen pressure leaching of copper sulfide concentrate was analyzed theoretically. The leaching effects of one-stage oxygen pressure leaching and two-stage oxygen pressure leaching process were studied. The results show that the copper leaching rate is 90.49%—92.25% by two-stage countercurrent oxygen pressure leaching. In the first stage, the temperature is 135—140 ℃, the total pressure is 1.3—1.4 MPa, the time is 2—2.5 h, the amount of dispersant is 4‰—5‰, and the amount of precipitation agent is 2.5%—3%. In the second stage, the temperature is 165—170 ℃, the total pressure is 1.4—1.5 MPa, the time is 2.5—3 h, the amount of dispersant is 6‰—7‰, and the amount of precipitation agent is 3%—3.5%. The leaching solution from the first stage contains copper 90.78—92.34 g/L, iron 10.81—13.84 g/L and H2SO4 28—30 g/L, which can be sent to subsequent iron removal purification–electrowinning to produce electrocopper.