Abstract:The Dulong polymetallic ore in Wenshan, Yunnan province is difficult to separation, so that the high content of arsenopyrite and impurities in the crude sulfide concentrate, which seriously affects the economic benefits of the enterprise. Based on the study of mineralogy of crude sulfur concentrate, combining process of "magnetic separation-deep grinding-flotation" was used in this paper to improve the quality of crude sulfur concentrate and recover zinc. The grades of S, Zn, and As in the obtained sulfide concentrate were 36.66%, 2.72%, and 0.63% respectively, the recovery of S was 75.73%. The grade of Zn in the zinc concentrate was 40.68%, and the recovery was 52.63%. The quality of the sulfide concentrate is obviously improved. The effect of improving quality and reducing impurities is obvious. Simultaneously, the recovery of zinc is also realized.