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Homogeneous Catalytic Dissolution of Recalcitrant Chalcopyrite (CuFeS2)

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Abstract

Being the most abundant copper sulfidic mineral, chalcopyrite (CuFeS2) is refractory to conventional hydrometallurgical methods, the result of which is incomplete or inefficient dissolution of copper. The complete dissolution in the presence of silver (Ag) catalyst was proved under optimized operating settings. The catalytic yield reached its highest value (97.18% conversion of CuFeS2 within 8 h) at 75 °C, potential control at 500–600 mV vs. standard hydrogen electrode (SHE), and solid percentage of 10% (w/v). The fresh and converted CuFeS2 samples were analyzed using chemical, mineralogical, and SEM–EDS techniques. These results indicated that the negative effect of the passive layer containing secondary precipitates (jarosite, sulfur, metal-deficient sulfide layer) formed on CuFeS2 can be completely controlled by providing optimal catalytic circumstances. Under these conditions, SEM images showed that chemical agents could have full access to the surface of CuFeS2 particles to completely convert. Leaching in sulfate media was one of the important advantages that these optimal conditions had for achieving nearly 100% recovery. As such, there are no concerns about chloride corrosion or related economic considerations. On the other hand, this leaching environment is completely compatible with the current operational solvent extraction and industrial electrowinning processes in the complex site, which can be considered as another important benefits of this optimized process. In terms of mechanisms, by analyzing SEM images of chalcopyrite samples before and after leaching, it was found that in addition to porosity created by silver ions at the surface for electron transfer, diffusion and formation of silver and silver sulfide itself was the main factor in increasing the electron flow capability of the chalcopyrite. Despite the passivation layer, this point was identified as the most important reason for increasing copper recovery and dissolution.

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Acknowledgements

The authors acknowledge the financial support of the National Iranian Copper Industries Company (NICICo.), Grant No. (1002).

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LZ: conceptualization, methodology, writing—original draft. ABV: conceptualization, data curation, writing—review and editing. MEM: conceptualization, supervision, methodology.

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Correspondence to Ali Behrad Vakylabad.

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Zand, L., Vakylabad, A.B. & Masoumi, M.E. Homogeneous Catalytic Dissolution of Recalcitrant Chalcopyrite (CuFeS2). Top Catal (2022). https://doi.org/10.1007/s11244-022-01565-x

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