pH-dependent leaching mechanism of carbonatitic chalcopyrite in ferric sulfate solution
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在pH值0.5～2.5、温度25℃和时间12 h的条件下,研究碳酸盐岩型黄铜矿在H2SO4-Fe2(SO4)3-FeSO4-H2O体系中的溶解行为.实验所用的颗粒粒度为53～75µm.在所有pH条件下,Cu的回收率均低于15％.浸出渣的XRD、SEM-EDS和光学显微镜(OM)分析结果表明,溶解过程中形成了中间相.pH为0.5和1.0时的中间相分别是Cu3.39Fe0.61S4和Cu2S,而pH值为1.5和1.8时的主要矿物为Cu5FeS4.热力学模拟预测产物的生成顺序为CuFeS2→Cu5FeS4→Cu2S→CuS.Cu5FeS4 and Cu2S为可溶性中间相,而CuS和Cu3.39Fe0.61S4是难溶中间相,在整个溶解过程中不断积累.所得结果表明,CuFeS2浸出过程中CuS和Cu3.39Fe0.61S4的生成有助于形成钝化膜.
The dissolution of a carbonatitic chalcopyrite (CuFeS2) was studied in H2SO4-Fe2(SO4)3-FeSO4-H2O at varying pH values (0.5-2.5) and 25 ℃ for 12 h. Experiments were conducted with a size fraction of 53-75 µm. Low Cu recoveries, below 15％, were observed in all pH regimes. The results from the XRD, SEM-EDS, and optical microscopic (OM) analyses of the residues indicated that the dissolution proceeded through the formation of transient phases. Cu3.39Fe0.61S4 and Cu2S were the intermediate phases at pH 0.5 and 1.0, respectively, whereas Cu5FeS4 was the major mineral at pH 1.5 and 1.8. The thermodynamic modelling predicted the sequential formation of CuFeS2→ Cu5FeS4→Cu2S→CuS. The soluble intermediates were Cu5FeS4 and Cu2S, whilst, CuS and Cu3.39Fe0.61S4 were the refractory phases, supporting their cumulating behaviour throughout the dissolution. The obtained results suggest that the formation of CuS and Cu3.39Fe0.61S4 could contribute to the passive film formed during CuFeS2 leaching.
Water Pollution Monitoring and Remediation Initiatives Research Group, School of Chemical and Minerals Engineering, Faculty of Engineering, North-West University, South Africa
Department of Chemistry, School of Science and Technology, Cape Breton University, Canada
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