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| Study on Chemical Leaching Kinetics of Covellite |
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Received:October 29, 2018
Revised:October 30, 2018
Accepted:October 31, 2018
Published Online:January 24, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.02.001 |
| KeyWord:chalcocite; covellite; chemical leaching; kinetics |
| Author | Institution |
| MIAO Yan |
福州大学紫金矿业学院 |
| MA Yingqiang |
福州大学紫金矿业学院 |
| LIAO Zhangyan |
福州外语外贸学院 |
| YIN Wanzhong |
福州大学紫金矿业学院 |
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| Abstract: |
| Through simulating technological conditions of heap bioleaching, chemical leaching kinetics of covellite was studied in acidic medium system of ferric sulfate in terms of leaching temperature, redox potential (ORP) and pH value. The results show that acid leaching of covellite by ferric sulfate conforms to typical shrinkage nucleation model with apparent activation energy of 48.94 kJ/mol, and leaching rate is controlled by surface chemical reaction rather than diffusion. Leaching rate of covellite is positively correlated with temperature and ORP, while pH value has weak influence on leaching of covellite. Leaching rate of covellite is 42.17% under the conditions including initial Fe3+ concentration of 9.2 g/L, Fe2+ concentration of 3.0 g/L, initial pH=1.00±0.05, ORP of (720±10)mV (vs. SHE), temperature of 40 ℃, and leaching time of 288 h. |
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