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| Effects of Aluminum on Precipitation of Sm-Eu-Gd Carbonate |
| Received:September 25, 2019 Revised:September 29, 2019 |
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| DOI：doi：10.3969/j.issn.1007-7545.2020.02.001 |
| KeyWord:aluminum; samarium; europium; gadolinium; precipitation |
| Author | Institution |
| GUO hui |
北方稀土冶炼分公司 |
| liu zhao-gang |
内蒙古科技大学 |
| WANG Ping |
中国北方稀土（集团）高科技股份有限公司冶炼分公司 |
| ZHANG Wen-bin |
中国北方稀土（集团）高科技股份有限公司冶炼分公司 |
| ZHANG Yong-hua |
中国北方稀土（集团）高科技股份有限公司冶炼分公司 |
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| Abstract: |
| To address northern mixed light rare earths accounting for 2% of medium and heavy rare earths, effects of aluminum content, solution concentration, precipitation mode on formation and growth of crystal nucleus of Sm-Eu-Gd (SEG) carbonate were investigated. The results show that sediment is composed of Sm2(CO3)3?2.85H2O, Eu2(CO3)3?3H2O and Gd2(CO3)3?3H2O under the conditions including rare-earth concentration of 200 g/L, aluminum content of 0.018 g/L in SEG solution, crystal seed of 50%, and forward precipitation. Effect of aluminum hydrolysis can be eliminated if aluminum content is lower than 0.02 g/L, resulting in large size, high degree of crystallization, and easy filtration of Sm-Eu-Gd carbonate grains. |
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