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| Leaching and Kinetics of Ni-Co Sulfide Slag under Different Leaching Conditions |
| Received:August 31, 2020 Revised:September 03, 2020 |
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| DOI：doi：10.3969/j.issn.1007-7545.2020.12.003 |
| KeyWord:nickel cobalt sulfide slag; leaching conditions; leaching rate; leaching kinetics |
| Author | Institution |
| Zheng Jiang-feng |
广东佳纳能源科技有限公司 |
| Wu Hao |
广东佳纳能源科技有限公司 |
| Zhang Chen |
广东佳纳能源科技有限公司 |
| Wen Dingqaing |
广东佳纳能源科技有限公司 |
| Ye Weiming |
广东佳纳能源科技有限公司 |
| Gao Qi |
广东佳纳能源科技有限公司 |
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| Abstract: |
| Effects of reaction temperature, solid-liquid ratio, oxygen partial pressure, stirring speed, concentration of leaching solution and reaction time on leaching and kinetics of cobalt and nickel from Ni-Co sulfide slag were studied. The results show that average leaching rate of Ni and Co is 94.02% and 94.64% respectively under the optimum conditions including reaction temperature of 120 ℃, solid-liquid ratio of 1︰30 g/mL, oxygen partial pressure of 0.7 MPa, stirring speed of 230 r/min, concentration of sulfuric acid of 1 mol/L, and reaction time of 130 min. Leaching of Ni and Co from Ni-Co sulfide slag conforms to shrinking core model and internal diffusion is a limiting step of reaction, and apparent activation energy is 3.65 kJ/mol and 6.02 kJ/mol respectively. Leaching rate of Ni-Co sulfide slag can be improved by reducing slag particle size and solid-liquid ratio, maintaining high concentration of leaching solution, stirring speed and oxygen partial pressure. |
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