(1. 中南大学 资源加工与生物工程学院，长沙 410083；
2. 中南大学 战略含钙矿物资源清洁高效利用湖南省重点实验室，长沙 410083)
摘 要: 铜烟灰中砷与有价金属的高效分离一直是制约二次资源利用的核心问题。以典型铜冶炼烟灰为原料，研究了影响烟灰选择性湿法脱砷的主要因素以及无定形FeS代替传统硫化剂在烟灰浸出液中的铜砷高效硫化分离行为。结果表明：在最佳浸出条件下，烟灰中铜浸出率超过95%，砷浸出率超过86%；无定形FeS随着陈化时间的延长，由无定形逐渐趋于晶体化，反应活性逐渐减弱；与Na2S相比，无定形FeS具有良好的硫源缓释效应可有效减少反应过程中H2S气体的逸出和改善产物的结晶性能。无定形FeS在实际浸出液中对铜的去除率大于99%，硫化铜渣中砷含量不超过2%(质量分数)；缓释除砷阶段渣砷品位大于25%。无定形FeS为铜烟灰中有价金属与砷的分离提供了一种较优的备选方案。
关键字: 无定形FeS；铜烟灰；缓释硫化；铜砷分离
（1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China）
Abstract:The efficient separation of arsenic from valuable metals in copper smelting dust has always been a key problem restricting the utilization of secondary resources. The main factors affecting the selective wet dearsenization of typical copper smelting dust and the sulfurization separation of copper and arsenic in the leachate by armphous FeS instead of traditional sulfurization agent were studied in this paper. The results show that, under the optimal leaching conditions, the leaching of copper in the dust is more than 95%, and the leaching of arsenic is more than 86%. With the prolongation of aging time, the armphous FeS tends to crystallize gradually from amorphous, and its reactivity decreases gradually. Compared with Na2S, FeS can effectively lower the H2S gas escape and improve the crystallization properties of the product based on its good sustained-release effect. The actual leaching experiments show that the copper removal of leaching solution is more than 99%, the arsenic content in copper sulfide product is less than 2%, and the grade of arsenic product is more than 25% using armphous FeS. The armphous FeS provides an alternative for the separation of valuable metals from arsenic in copper smelting dust.
Key words: armphous FeS; copper smelting dust; sustained-release sulfide; copper-arsenic separation
