(1. 中南大學 資源加工與生物工程學院，長沙 410083；
2. 中南大學 戰(zhàn)略含鈣礦物資源清潔高效利用湖南省重點實驗室，長沙 410083)
摘 要: 銅煙灰中砷與有價金屬的高效分離一直是制約二次資源利用的核心問題。以典型銅冶煉煙灰為原料，研究了影響煙灰選擇性濕法脫砷的主要因素以及無定形FeS代替?zhèn)鹘y(tǒng)硫化劑在煙灰浸出液中的銅砷高效硫化分離行為。結果表明：在最佳浸出條件下，煙灰中銅浸出率超過95%，砷浸出率超過86%；無定形FeS隨著陳化時間的延長，由無定形逐漸趨于晶體化，反應活性逐漸減弱；與Na2S相比，無定形FeS具有良好的硫源緩釋效應可有效減少反應過程中H2S氣體的逸出和改善產物的結晶性能。無定形FeS在實際浸出液中對銅的去除率大于99%，硫化銅渣中砷含量不超過2%(質量分數)；緩釋除砷階段渣砷品位大于25%。無定形FeS為銅煙灰中有價金屬與砷的分離提供了一種較優(yōu)的備選方案。
關鍵字: 無定形FeS；銅煙灰；緩釋硫化；銅砷分離
（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
