Takunda Joseph Mhandu, Ilhwan Park
The use of thiosulfate to extract gold from refractory ores is promising because of its non-toxicity and high selectivity. Sulfide minerals (i.e., pyrite, arsenopyrite, chalcopyrite), major gold carriers in refractory gold ores, however, hinder gold extraction due to the high consumption of a lixiviant. In this study, a new method to improve gold extraction from sulfide bearing gold ores is proposed based on the model experiments using a mixture of gold powder and arsenopyrite-bearing sulfide (HAsBS) ore. The effects of HAsBS ore on gold leaching in ammonium thiosulfate solutions were investigated, and it was found that gold extraction in the presence of HAsBS ore was suppressed because of the unwanted decomposition of thiosulfate on the surface of sulfide minerals. To improve gold extraction in the presence of the sulfide minerals, this study investigated the effects of the pretreatment of HAsBS ore using ammonium solutions containing cupric ions and confirmed that HAsBS ore was oxidized in the pretreatment and its surface was covered by the oxidation products. As a result, thiosulfate consumption was minimized in the subsequent gold leaching step using ammonium thiosulfate, resulting in an improvement in gold extraction from 10% to 79%.
@article{ae41bb1f-f66b-4d62-b8bd-c098a7f7d6f4,
title={A Pretreatment of Refractory Gold Ores C},
author={Takunda Joseph Mhandu and Ilhwan Park},
year={2026},
language={en}
}TY - JOUR TI - A Pretreatment of Refractory Gold Ores C AU - Takunda Joseph Mhandu AU - Ilhwan Park PY - 2026 LA - en ER -
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