Recovery of lead, copper and tin from copper dross wastes based on a sequential phase conversion using sulfur and
Chenpeng Cao1, Lei Li2, Ruitao Sun3
1College of Environmental Science and Engineering, Donghua University, Shanghai 201620, PR China.
Abstract:
The copper dross waste is a hazardous material generated from the pyrometallurgical refining of lead bullion, which was mainly consisted of heavy metals of lead, copper, arsenic and tin. Without treatment, it would threaten environmental security. This study proposed an innovative phase conversion method for multi-metal separation and recovery from it. First roasting with sulfur in inert and then oxidizing atmosphere, the arsenic phase of Cu3As and Pb-As alloy were converted to Pb9As4S15 and Cu3AsS4 and then selectively oxidized to volatile As4O6 (g). It realized the arsenic removal at an efficiency of 91.9 %. The lead, copper and tin phases converted to PbSO4, PbS, Cu2S and SnS in the residue. In the next smelting of the roasted residue, PbSO4 was used to selectively convert PbS from Cu2S and SnS. Concretely, the lead phase changed to metallic Pb and was recycled, while Cu2S remained unchanged and concentrated in a matte. SnS volatilized and was recycled in a volatile matter. Under the optimized conditions, the distribution of lead in the metal achieved 92.7 %, copper in the matte achieved 93.8 % and tin in the volatile matter achieved 91.5 %. This study has a great significance to increase environmental safety and resource circle in lead smelting.
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