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| Thermodynamic Analysis and Application of Complex Gold Concentrate-NaOH-O2 System |
| Received:November 23, 2020 Revised:December 14, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2021.05.012 |
| KeyWord:complex gold concentrate; sodium hydroxide; roasting; thermodynamics |
| Author | Institution |
| WANG Rui-xiang |
江西理工大学 材料冶金化学学部 |
| ZHOU Jie |
江西理工大学 材料冶金化学学部 |
| LIU Cha-xiang |
江西理工大学 材料冶金化学学部 |
| YANG Yu-dong |
江西理工大学 材料冶金化学学部 |
| LI Ming-zhou |
江西理工大学 材料冶金化学学部 |
| YUAN Yuan-liang |
江西理工大学 材料冶金化学学部 |
| WANG Yan-yang |
江西理工大学 材料冶金化学学部 |
| XU Zhi-feng |
江西应用技术职业学院 |
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| Abstract: |
| Based on thermodynamic theory, effects of alkali-ore ratio, oxygen concentration, residual oxygen rate, and roasting temperature on extraction of gold, silver, and copper from a complex gold concentrate containing multiple metals were simulated and calculated. Content relationship between substances through thermodynamic equilibrium relationship of independent reactions was determined. Reaction mechanism of sodium hydroxide roasting in complex gold ore was determined. The results show that the optimum roasting conditions include alkali-to-ore ratio of 10%, oxygen concentration of 25%, residual oxygen rate of 5%, and calcination temperature of 630 ℃. Thermodynamic conditions are verified by orthogonal experiment. Complex gold concentrate is roasted for 3 h under the optimum conditions followed by sulfuric acid leaching-cyanide process. Under these conditions, extraction rate of gold, silver and copper is 95.92%, 84.24% and 92.57%, respectively. |
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