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| Removal Technology of Potassium from Aluminum Electrolyte |
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Received:February 07, 2024
Revised:February 18, 2024
Accepted:February 20, 2024
Published Online:June 05, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.07.009 |
| KeyWord:aluminum electrolysis; high potassium electrolyte; potassium removal technology; solid volatiles; low temperature electrolyte |
| Author | Institution |
| CHEN Kaibin |
1.中南大学，2.中铝郑州有色金属研究院有限公司 |
| BAO Shengzhong |
中铝郑州有色金属研究院有限公司 |
| LI Jie |
中南大学 |
| WANG Huaijiang |
中铝郑州有色金属研究院有限公司 |
| ZHANG Fangfang |
中铝郑州有色金属研究院有限公司 |
| SHI Xu |
中铝郑州有色金属研究院有限公司 |
| MA Junyi |
中铝郑州有色金属研究院有限公司 |
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| Abstract: |
| Address to the high potassium content in aluminum electrolyte in Southwestern China, a technology scheme of potassium removal in aluminum electrolytic process was proposed. According to the actual situation of an electrolytic aluminum enterprise, through sampling analysis, theoretical deduction and flotation separation test, the concrete implementation scheme was put forward, and the feasibility of the scheme was demonstrated. The results show that KF in aluminum electrolytes is volatile and enters the electrolytic flue gas in form of solid fluoroaluminates such as KAlF4, K2NaAl3F12 and K2NaAlF6. The content of KF in aluminum electrolytes of different enterprises is different, but the content of KF in the volatiles of electrolyzer is similar. The equilibrium concentration of KF in aluminum electrolytic cell can be reduced rapidly by collecting the solid volatiles in aluminum electrolytic gas so that it can no longer be mixed with fluorinated alumina and entering the electrolytic cell again. The high potassium fluoroaluminates, which is separated from the collected solid volatiles by flotation method, can be used to prepare low temperature electrolytes. The scheme is technically feasible. |
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