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| Effect of Chloride on Bio-oxidation and Carbon-in-leach Cyanidation of Refractory Gold Concentrate |
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Received:September 23, 2022
Revised:September 28, 2022
Accepted:October 08, 2022
Published Online:January 09, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.02.012 |
| KeyWord:high arsenic refractory gold concentrate; chloride; bio-oixidation; carbon-in-leach cyanidation |
| Author | Institution |
| ZHANG Yu-fang |
低品位难处理黄金资源综合利用国家重点实验室 |
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| Abstract: |
| High salt mining areas often lack fresh water resources for production. In view of the saline status in mining area, the biooxidation - cyanidation gold extraction tests for high arsenic refractory gold concentrate were carried out by using water with different chloride concentration. Effect of chloride in biooxidation solution on sulfide oxidation rises with increase of chloride concentration. At the level of 1.5 g/L Cl- or above, the negative impact of chloride is signficant. Biooxidation via salt water with 10 g/L Cl- extends to 18 days, arsenic extraction and sulfur oxidation is 35.3% and 88.4% respectively. Water quality used in cyanidation has influence on the cyanidation of biooxidation residue: gold extraion with 10 g/L Cl- salt water under the same cyanidation conditions is lower than that with tap water. After biooxidation for 10 days with 1.5 g/L and 5 g/L Cl- salt water, subsequently gold extraction of caynidatioin with 10 g/L Cl- salt water is 2.8% and 3.4% lower than that with tap water. In biooxidation, arsenic extraction is higher than sulfur oxidation, demonstrating that arsenopyrite oxidation is higher than pyrite. Gold extraction is closely correlates to arsenopyrite oxidation. |
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