In this paper, we report a novel method to improve the flotation separation of chalcopyrite from arsenopyrite under low-alkalinity conditions. Single mineral flotation experiment results showed that individual use of CTP had weak inhibition on arsenopyrite flotation while no inhibition on chalcopyrite flotation. However, the addition of Ca²⁺ greatly enhanced the inhibition of CTP on arsenopyrite flotation while slightly affected chalcopyrite flotation. The artificial mixed mineral flotation experiment results showed that a concentrate with Cu grade of 29.01% and As grade of 7.51% was obtained, with Cu recovery of 80.20% and separation efficiency of 41.75%. Compared with no addition of Ca²⁺ and CTP, the Cu grade in the concentrate was increased by 10.53%, the As grade was decreased by 13.94%, and the separation efficiency was increased by 38.3%. This further demonstrated that utilization of Ca²⁺ as an assistant depressant of CTP can well improve the flotation separation of chalcopyrite from arsenopyrite, which is consistent with the single mineral flotation experiment results. It is expected that this study will be helpful for the arsenic removal in the industrial production practice of arsenic-bearing copper sulfide ore.

在本文中，我们报告了一种在低碱度条件下改进黄铜矿与毒砂矿浮选分离的新方法。单矿物浮选试验结果表明，单独使用CTP对毒砂浮选抑制较弱，对黄铜矿浮选无抑制作用。但Ca ²⁺的加入大大增强了CTP对毒砂浮选的抑制作用，而对黄铜矿浮选的影响较小。人工混合矿物浮选试验结果表明，得到铜品位29.01%、砷品位7.51%的精矿，铜回收率为80.20%，分离效率为41.75%。与不添加Ca ^2+相比与CTP相比，精矿中Cu品位提高10.53%，As品位降低13.94%，分离效率提高38.3%。这进一步证明了利用Ca ²⁺作为CTP的助抑制剂可以很好地提高黄铜矿与毒砂的浮选分离效果，这与单一矿物浮选实验结果一致。预计本研究对含砷硫化铜矿工业生产实践中的除砷有一定的帮助。