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Chalcopyrite Leaching in a Dimethyl Sulfoxide Solution Containing Copper Chloride

Kota Takatori, Hidekazu Kato

2021enchalcopyriteleachingcopperdimethyl sulfoxidehydrometallurgy

Abstract

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Chalcopyrite (CuFeS2) is recognized as the most refractory copper mineral when processed in conventional sulfate media leaching systems. This study investigates the efficacy of using a dimethyl sulfoxide (DMSO) solution combined with copper chloride (CuCl2) for the leaching of chalcopyrite. Leaching experiments were conducted on a copper concentrate predominantly composed of chalcopyrite under ambient pressure, with temperatures ranging from 313 to 413 K. The resulting leaching fractions of copper (Cu), iron (Fe), sulfur (S), gold (Au), and arsenic (As) were examined. Findings indicate that 90% of copper was extracted within 2 hours, and 94% within 4 hours at 373 K, demonstrating competitive efficiency compared to traditional processes. The DMSO solution with CuCl2 selectively dissolved the valuable metals Cu and Au from chalcopyrite, while leaving economically less valuable minerals, such as pyrite (FeS2) and As, in the residue. Additionally, it was observed that chalcopyrite oxidation proceeds in direct proportion to the stoichiometric ratio of Cu in the concentrate to the initial cupric ions in the DMSO solution, which is further enhanced by the presence of oxygen at temperatures below 373 K.

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Cite This Work

@article{fe673c43-5d90-4b17-9861-82f52e30f721,
  title={Chalcopyrite Leaching in a Dimethyl Sulfoxide Solution Containing Copper Chloride},
  author={Kota Takatori and Hidekazu Kato},
  year={2021},
  language={en}
}
TY  - JOUR
TI  - Chalcopyrite Leaching in a Dimethyl Sulfoxide Solution Containing Copper Chloride
AU  - Kota Takatori
AU  - Hidekazu Kato
PY  - 2021
LA  - en
ER  -

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