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| Effects of Lithium and Potassium Salts on Alumina Concentration in Complex Aluminum Electrolyte System |
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Received:February 25, 2020
Revised:March 09, 2020
Accepted:March 10, 2020
Published Online:May 26, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.06.007 |
| KeyWord:electrolyte system; lithium salt; potassium salt; alumina concentration |
| Author | Institution |
| LIChunhuan |
百色学院化学与环境工程学院 |
| Cao Alin |
百色学院材料科学与工程学院 |
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| Abstract: |
| Due to complex sources of alumina in China, especially rich in Li and K elements, lithium salt and potassium salt enrich in aluminium electrolyte system and has a big impact on dissolution process of alumina. Based on a large number of production data, influences of LiF and KF on solubility of alumina in complex aluminium electrolyte system were analyzed. The results show that lithium salt and potassium salt in electrolyte system react with cryolite to form lithium fluoride and potassium fluoride. Concentration of alumina drops with increase of lithium fluoride concentration at low lithium fluoride concentration (<3.00%), and concentration of alumina rises with increase of lithium fluoride concentration at high lithium fluoride concentration (>3.00%). Concentration of alumina rises with increase of fluoride concentration in complex aluminium electrolyte system. Concentration of lithium fluoride in the range of 1.50%-2.50% can keep the optimal state of aluminium electrolysis process, and potassium fluoride should be avoided as much as possible. |
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