Abstract:As an enhanced metallurgical technology, oxygen pressure leaching process has the characteristics of stable technical index, good operating environment and low production cost, and the leaching effect of arsenic from black copper mud is better than conventional oxygen pressure acid leaching and oxygen pressure alkali leaching. Black copper mud was treated by oxygen pressure leaching process, and effects of initial concentration of sulfuric acid, pressure, reaction temperature, L/S, and reaction time on the leaching of copper and arsenic were explored. The results show that when L/S is 8 mL/g, initial concentration of sulfuric acid is 80 g/L, reaction temperature is 120 ℃, partial pressure of oxygen is 0.3 MPa, and reaction time is 2 h, the leaching rate of copper and arsenic is 99.78% and 97.08% respectively, and the leaching rate of arsenic is 7.79 and 9.76 percent points higher than that of oxidation acid leaching and oxidation alkali leaching, respectively. It is a good choice of black copper mud leaching process and suitable for upgrading of conventional copper smelting enterprises.