M. Sadegh Safarzadeh, Michael S. Moats
As an alternative to roasting, low-temperature (100–200 °C) sulfuric acid baking of an enargite concentrate followed by water-leaching has been evaluated. Results indicate the thermal transformation of enargite and pyrite during sulfuric acid baking. By acid baking of an enargite concentrate at 200 °C for 7 h, approximately 90% Cu and 61% As were released to the leach solution, with less than 1% of arsenic being released to the gas phase. The effects of time and temperature were studied on the baking reactions. Extended reaction times (24 h) at lower baking temperatures (170 °C) resulted in lower Cu and As extraction and higher As release to the gas phase (approximately 11%). The pH of the water leach solution was always around 0.8–2 after extraction due to residual acid, making it suitable for subsequent copper recovery. The oxidation-reduction potential (ORP) of the leach solution fell within the range of 491–566 mV (vs. SHE) depending on the baking conditions. The ratio of ferric/ferrous ions in the leach solution showed considerable dependence on reaction time and temperature. Based on this study, some reactions are proposed for the sulfuric acid baking of enargite.
@article{9a6be622-6d12-4fc7-8332-e7cba718f58f,
title={Acid bake leach process for the treatmen},
author={M. Sadegh Safarzadeh and Michael S. Moats},
year={2026},
language={en}
}TY - JOUR TI - Acid bake leach process for the treatmen AU - M. Sadegh Safarzadeh AU - Michael S. Moats PY - 2026 LA - en ER -
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