G. C. Li, S. C. Lu
Gold extraction using iodide leaching from refractory carbonaceous gold ores was studied to address the limitations of conventional cyanidation processes. The objective was to optimize leaching parameters and evaluate the efficiency of iodide leaching for recovering gold from these challenging ores. A thermodynamic analysis was conducted, revealing that the active forms in the leaching chemistry were I3- and I-, with AuI- as the main coordinate compound. Key parameters such as iodine concentration, I2: I- ratio, and oxidation assisting agents were tested to enhance the leaching efficiency. Results showed that the average gold leaching rates were 91% for oxidized ore and 92% for roasted primary ore under mild acidic conditions, with a leaching duration of four hours at ambient temperature. The adsorption-desorption-electrowinning process achieved gold recovery rates exceeding 93% during adsorption and approximately 95% in electrowinning, contingent upon initial gold concentrations of 40 mg/L or higher. The findings highlight the potential of iodide leaching as an efficient and environmentally friendly alternative for gold extraction from refractory carbonaceous ores.
@article{78ca21ef-d7dc-4f76-b2c4-3fe6e7adb5c2,
title={Iodide Leaching Gold from Carbonaceous Refractory Gold Ores},
author={G. C. Li and S. C. Lu},
year={2026},
language={en}
}TY - JOUR TI - Iodide Leaching Gold from Carbonaceous Refractory Gold Ores AU - G. C. Li AU - S. C. Lu PY - 2026 LA - en ER -
Richard E Browner
This chapter examines the fundamental chemistry underpinning the carbon-in-pulp (CIP) process for gold extraction, with particular emphasis on leachin
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