Abstract: Aiming at a low-grade oxidized copper ore resource in Yunnan province , this paper adopts thetreatment process of sulfuric acid leaching with low investment , fast effectiveness and low pollution, andfocuses on the influence of leaching agent coneentration, mineral particle size, liquid-solid ratio , leac.hing time , leaching temperature and stirring intensity on copper leaching rate. Through the experimentalresearch , it was found that the low-grade oxidized copper ore is suitable for sulfuric acid leaching treat.ment. The optimum parameters are obtained, namely, concentration of leaching agent is 220 g/kg, themineral size is 40 mesh, the liquid-solid ratio is 3: 1 , leaching for 4 h, the leaching temperature is 60℃Cand the stirring intensity is 500 r/min. Under the conditions of the best acid leaching parameters, theleaching rate of the oxidized ore reaches 84% , the concentration of copper ion in the leaching solutionreaches 6. 9 g/L, and the grade of copper in the leaching residue is reduced to about 0. 26% . The exper-imental results make the low-grade copper resources that have not been effectively developed and utilizedin the past can be gradually developed, effectively expand the scope of copper resources, and have cer-tain economic and social benefits , providing a reference for similar mineral treatment and utilization oflow-grade copper resources.

Key words: oxidized copper, acid leaching, leaching rate, copper grade