Jordy Dinga, Thandazile Moyo-Mahlangu
The leaching of chalcopyrite in sulfate or chloride media has been proposed to occur through a combined non-oxidative/oxidative mechanism, where H2S forms an intermediary species, concurrently with direct oxidative leaching. Some studies have noted that elevated concentrations of Cu(II) improve chalcopyrite leaching in sulfate media. In this study, the role of Cu(II) was investigated in the non-oxidative/oxidative process through electrochemical tests on a chalcopyrite electrode, supported by bulk leach tests. The results of the electrochemical tests are consistent with the formation of H2S through non-oxidative leaching of chalcopyrite. The H2S subsequently reacts with Cu(II) to form intermediate cuprous sulfide species, which can be readily oxidized by dissolved oxygen. The bulk leach tests point to a synergy between Cu(II) and O2, further pointing to the catalytic role of Cu(II). The findings support the feasibility of running heap leaching of chalcopyrite-rich ores at elevated copper concentrations in either chloride or sulfate systems.
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title={2026 Dinga CuII role in chalcopyrite sulfuric acid leaching},
author={Jordy Dinga and Thandazile Moyo-Mahlangu},
year={2026},
language={en}
}TY - JOUR TI - 2026 Dinga CuII role in chalcopyrite sulfuric acid leaching AU - Jordy Dinga AU - Thandazile Moyo-Mahlangu PY - 2026 LA - en ER -
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