云南某混合铜冶炼渣高效选铜新工艺研究

铜冶炼渣产量巨大，有价组分含量高，其回收利用具有重要的经济效益和环保意义。针对某混合铜冶炼渣，开展铜渣缓冷及磨浮工艺优化试验研究。首先，通过控制铜渣冷却方式，即自然冷却24 h—喷淋冷却24 h—自然冷却24 h，调节冶炼渣中铜矿物的结晶粒度大小和晶体成长形式。然后通过阶段磨矿、阶段选别的工艺流程，于磨矿回路中设立快速浮选，不仅提前获得了产率10.04%、铜品位21.02%、铜回收率60.24%的高品质铜精矿，还减少了进入后续磨浮流程的矿量，大大降低了再磨成本及药剂成本。最后，快速浮选尾矿再磨后，通过1粗2精2扫，使尾矿铜品位降低至0.29%。本研究提出的铜冶炼渣选矿工艺流程短、效率高，获得的精矿综合铜品位为20.70%、铜回收率为93.02%，达到国内先进水平。且尾矿可作为水泥厂添加料直接销售，选矿用水可直接回用，基本达到生产废渣与废水的零排放，为类似冶炼渣的综合回收利用提供较好参考，对实现我国铜产业可持续发展具有重要意义。

Study on a New Technology for Efficient Separation of Copper from a Mixed Copper Slag in Yunnan

Copper slag has a huge output and a high content of valuable components.Its recycling has considerable economic benefits and environmental protection significance.Aiming at a mixed copper slag,the study on the slow cooling and optimization of grinding and flotation of copper slag was carried out.First,the slow cooling of the copper slag was controlled to regulate the crystal size and growth,that is natural cooling for 24 hours,spray cooling for 24 hours and natural cooling for 24 hours.Then,the process flow of stage grinding and stage separating was adopted,and a instant flotation was set up in the grinding circuit,which not only helped obtain the high quality copper concentrate with a yield of 10.04%,copper grade of 21.02% and recovery rate of 60.24% in advance,but also reduced the amount of ore entering the subsequent grinding and flotation process,thus greatly decreasing the regrind cost and the cost of reagents.Finally,the tailings of instant flotation reported to regrinding,followed by being subject to one stage roughing,two stage cleaning,and two stage scavenging to reduce the copper grade in tailings to 0.29%.The proposed copper slag processing flow is short and efficient.The overall copper concentrate grade of the whole process is 20.70%,and the recovery rate is 93.02%,reaching China’s advanced level.Meanwhile,the tailings can be directly sold as additives for cement plants,and the beneficiation water can be directly reused,basically achieving zero discharge of production solid waste and wastewater,which provides a good reference for the comprehensive recovery and utilization of similar smelting slag,and is of great significance to the sustainable development of China's copper industry.