Abstract:Benification of copper and cobalt of the Kalagailei copper-cobalt ore from Xinjiang is difficult to achieve, and arsenic content in the copper concentrate and cobalt concentrate would exceed the national standard.A systematical process mineralogy study is carried out on this ore using a variety of means. The results show that the ore contains 0.84% of copper, 0.10% of cobalt, and 0.48% of harmful arsenic. The oxidation rate of copper and cobalt is very low, which is 2.38% and 0.99% respectively. Chalcopyrite is the main copper mineral and particle size unevenly distributed. Chalcopyrite mainly output as fine fractions, the distribution rate is 53.45%; secondly as coarse and medium fractions, the distribution rate is 41.17%, as particle distribution of the chalcopyrite is 5.38%. Cobalt mainly exist in arsenopyrites, danaite, glaucodot and cabaltine as isomorphous substitution. Therefor Co and As cant not be separated in the process of mineral processing. Because of the close symbiosis of copper and cobalt minerals, the content of As in the copper concentrate is so easy to be out of the standard. According to the technical characteristics of the ore, stage grinding and subsection selection processing to gradually separate the copper and cobalt minerals is suitable for the ore.