Abstract
A gold containing chalcopyrite concentrate has been treated with thiourea using H 2SO 4. The effects of some leach parameters such as thiourea concentration, oxidizing agents, redox potential, pH, temperature, pulp density, acid pretreatment and SO 2 addition have been investigated. Maximum gold and silver extractions are respectively 95.5% and 85.4%. Hydrogen peroxide was found to be an appropriate oxidant and successive leaches were performed to handle a 60% S/L pulp. The consumption of thiourea is estimated to be 5–7 kg/t of concentrate. The value of the redox potential is an important factor that i influences thiourea consumption and gold extraction. Acid pretreatment and SO 2 addition were useful in lowering thiourea consumption. Pretreatment also reduces the SO 2 requirement of the system and improves silver extraction.
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