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| Study on Acid Leaching Cyanide Process of Complex Gold Concentrates and Evolution of Gold and Silver Phases |
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Received:November 12, 2018
Revised:November 14, 2018
Accepted:November 16, 2018
Published Online:January 24, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.02.008 |
| KeyWord:complex gold concentrate; acid leaching; leaching rate; phase analysis; silver |
| Author | Institution |
| Wang Rui-Xiang |
江西理工大学冶金与化学工程学院 |
| YUAN Yuna-liang |
信丰华锐钨钼新材料有限公司 |
| Chen fanghui |
江西理工大学冶金与化学工程学院 |
| Yang yudong |
江西理工大学冶金与化学工程学院 |
| Guo Yuedong |
江西理工大学冶金与化学工程学院 |
| Guo Yuedong |
江西理工大学冶金与化学工程学院 |
| Tian lei |
江西理工大学冶金与化学工程学院 |
| Xu zhifeng |
江西理工大学冶金与化学工程学院 |
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| Abstract: |
| Copper leaching rate of acid leaching-cyanide process in complex gold concentrate calcine acid leaching-cyanide process and leaching rates of gold and silver in subsequent cyanidation process were studied. The results show that leaching rates of gold, silver and copper are 93.21%, 83.25%, and 95.57% separately under the optimum leaching conditions including leaching temperature of 363 K, leaching time of 3 h, sulfuric acid concentration of 1.0 mol/L, stirring speed of 300 r/min, and L/S=4/1. Silicate inclusion is the main cause of low silver leaching rate. Content of silver silicate inclusions is 60.30% of total amount of silver in cyanide residue without additives in roasting process. Sodium hydroxide addition in roasting process can effectively reduce probability of silver silicate inclusion and improve silver leaching rate. Content of silver silicate inclusion is only 27.56% of total amount of silver in cyanide residue in sodium hydroxide roasting process. |
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