Abstract: In copper-zinc sulfide ores containing pyrrhotite,the floatability of pyrrhotite differs little from that of activated sphalerite in conventional xanthate collector systems,making pyrrhotite a major gangue impurity in zinc concentrate.This often leads to low zinc separation efficiency,substandard concentrate grade,and poor resource recovery.To address these challenges, this study takes a copper-zinc sulfide ore containing pyrrhotite as the research object.Based on systematic process mineralogy studies,beneficiation process exploration was conducted,and the optimal process flow of “preferential copper flotation,magnetic separation to remove pyrrhotite and zinc flotation” was determined.Subsequently,condition tests for copper flotation,magnetic separation,and zinc flotation were carried out to optimize the key parameters of each operation,followed by full-process closed circuit tests.The test results show that the full-process closed-circuit test yields a copper concentrate with a copper grade of 25.080% and a copper recovery of 76.56%,and a zinc concentrate with a zinc grade of 50.82% and a zinc recovery of 93.23%.This process effectively eliminates the interference of pyrrhotite in copper-zinc separation and achieves efficient sepa ration and recovery of copper and zinc resources,providing a reliable technical reference for the industrial beneficiation of simi lar complex refractory copper-zinc sulfide ores.

Key words: pyrrhotite,copper-zinc sulfide ore,preferential flotation,magnetic separation,separation and recovery