Ahmet Deniz Basa, Wei Zhanga
This study investigates the electrochemical interactions between gold and its associated oxide minerals either in one (OC) or two separate containers (TC) in the presence or absence of slurry. Magnetite showed a negative effect on gold leaching, while maghemite and hematite demonstrated a positive effect, relatively. The presence of slurry generally resulted in lower current densities. However, when the tailings of slurry were used again as a new feed in two separate containers (TC), the dissolution rate of gold increased by three times (30 to 90 μA/cm²), suggesting the removal of detrimental ions in the first stage. Moreover, magnetic pre-treatment of roasted gold ore enhanced the current density of gold by up to ten times. It was found that in cyanide solutions saturated with atmospheric oxygen, the cathodic Tafel slope provided close corrosion rates of gold to that in practical cyanidation, suggesting that cathodic polarization is the rate-controlling factor. Furthermore, a new electrode composed of equal quantities of magnetite and hematite was developed to examine their influence on gold leaching, with 0.04 M NaCN at 100 rpm agitation found to be optimal. SEM analysis indicated the presence of Fe-oxide and Au–C compound products that could be responsible for partial passivation of the gold surface.
@article{d766064e-0b3b-4f6b-be2e-13034d947e6b,
title={A study of the electrochemical dissolution and passivation phenomenon of roasted gold ore in cyanide solutions},
author={Ahmet Deniz Basa and Wei Zhanga},
year={2015},
language={en}
}TY - JOUR TI - A study of the electrochemical dissolution and passivation phenomenon of roasted gold ore in cyanide solutions AU - Ahmet Deniz Basa AU - Wei Zhanga PY - 2015 LA - en ER -
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