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| New Technology of Two-stage Pressure Leaching of Nickel Extraction from Nickel Laterite Ore |
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Received:June 14, 2024
Revised:August 05, 2024
Accepted:August 06, 2024
Published Online:September 11, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.10.003 |
| KeyWord:nickel laterite ore; pressure leaching; high pressure acid leaching; nickel |
| Author | Institution |
| ZHENG Chaozhen |
矿冶科技集团有限公司 |
| LIU Sanping |
矿冶科技集团有限公司 |
| WANG Haibei |
矿冶科技集团有限公司 |
| JIANG Kaixi |
矿冶科技集团有限公司 |
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| Abstract: |
| Two-stage pressure leaching process is proposed to extract Ni from limonite-type and saprolite-type nickel laterite ore. The recommended conditions for the first stage high pressure acid leaching include acid ore ratio of 330 kg/t, temperature of 250 ℃, slurry solid content of 30% and reaction time of one hour. The recommended conditions for the second stage pressure leaching include temperature of 230 ℃, reaction time of one hour and slurry solid content of 35%., The nickel extraction rate of first stage high pressure acid leaching and second stage pressure leaching is 97.58% and 83.96% respectively, and the total nickel leaching rate is 93.81%, which greatly improves the utilization rate of nickel laterite ore resources. The Fe and Al concentration in solution can be reduced to below 1 g/L, which can reduce the amount of alkali used in subsequent neutralization processes. |
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