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| Study on Extraction Separation of Aluminum and Rare Earth Mixture in Cycloalkane Acid System |
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Received:May 14, 2019
Revised:May 23, 2019
Accepted:May 23, 2019
Published Online:October 23, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.11.008 |
| KeyWord:cycloalkane acid system; mixed rare earth solution; aluminum; distribution ratio; separation coefficient |
| Author | Institution |
| LI Zhi-guo |
内蒙古科技大学，北方稀土冶炼分公司（华美公司） |
| LIU Zhao-gang |
内蒙古科技大学 |
| SUN Xiang |
中国北方稀土集团冶炼分公司（华美公司） |
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| Abstract: |
| Distribution ratio (D) and separation coefficient (β) of mixed rare earth and aluminum in naphthenic acid system were studied under different acidity of mixed light rare earth materials, aluminum concentration and different saponification values of extractant. The results show that when pH value of the mixed rare earth solution is 0.5, DAl=16, DRE=0.044 8, and βAl/RE=356.9; when Al2O3 concentration in solution is 0.17~0.32 g/L, DAl>1, and βAl/RE exist biger value; when degree of saponification is 0.3 mol/L, not only emulsification caused by oversaponification can be avoided, but also rare earth and aluminum have better separation effect. Therefore, separation effect and higher separation factor of aluminum and mixed rare earth can be obtained in naphthenic acid system with high acidity, low aluminum concentration and low degree of saponification. Organic phase and aqueous phase are easier to stratify, and extraction reaction interface is basically free of three phases under the optimum separation and extraction experiments conditions. Aluminum content in remaining liquid is less than 0.011%, which satisfies requirements for aluminum content in industrial production. |
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