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| Precipitation Process of Magnesium Salt Rare Earth Leaching Solution |
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Received:December 13, 2021
Revised:December 18, 2021
Accepted:December 22, 2021
Published Online:April 12, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.05.007 |
| KeyWord:magnesium chloride; magnesium sulfate; rare earth precipitation; magnesium oxide |
| Author | Institution |
| ZHANG Zhen-yue |
武汉工程大学资源与安全工程学院 |
| XI Yin-long |
武汉工程大学资源与安全工程学院 |
| LI Dan |
武汉工程大学资源与安全工程学院 |
| CHI Ru-an |
武汉工程大学资源与安全工程学院 |
| LONG Fei |
武汉工程大学资源与安全工程学院 |
| CHEN Zhuo |
武汉工程大学资源与安全工程学院 |
| CHEN Wen-dou |
武汉工程大学资源与安全工程学院 |
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| Abstract: |
| In order to solve environmental pollution caused by industrial process of recovering rare earth from ammonium salt, the process of magnesium oxide precipitation of magnesium salt rare earth leaching solution was studied, and effects of magnesium oxide addition mode, magnesium oxide dosage ratio, precipitation temperature and precipitation time on rare earth precipitation in magnesium salt rare earth leaching solution were explored. The results show that under the same magnesium oxide dosage ratio, rare earth precipitation rate of magnesium oxide slurry is better than that of magnesium oxide powder. When magnesium oxide slurry is used to precipitate magnesium chloride and magnesium sulfate rare earth leaching solution, the precipitation rate of heavy rare earth is higher than that of light rare earth. The optimal dosage ratio of magnesium oxide slurry is 1.4 and 1.1 respectively, the optimal precipitation temperature is 35 ℃ and 25 ℃ respectively, and the time for precipitation reaction to reach equilibrium is both 180 min. Precipitation rate of rare earth in rare earth leaching solution of magnesium chloride and magnesium sulfate is 97.11% and 94.12% respectively. The results have guiding significance for recovering rare earth from rare earth leaching solution of magnesium salt. |
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