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| Treatment of Aluminum Electrolytic Spent Carbon Cathode via High-temperature Roasting |
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Received:October 08, 2022
Revised:October 12, 2022
Accepted:October 18, 2022
Published Online:January 09, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.02.017 |
| KeyWord:aluminum electrolysis; spent carbon cathodes; high temperature roasting; recovered carbon; leaching toxicity |
| Author | Institution |
| ZHOU Liu-zhou |
贵州师范大学 材料与建筑工程学院 |
| CHEN Yi |
贵州师范大学 材料与建筑工程学院 |
| LI Li-qi |
贵州师范大学 材料与建筑工程学院 |
| ZHANG Gong-wen |
贵州师范大学 材料与建筑工程学院 |
| LUO Guo-chao |
贵州师范大学 材料与建筑工程学院 |
| YAO Zhen |
贵州师范大学 材料与建筑工程学院 |
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| Abstract: |
| The harmless resource utilization of spent carbon cathodes has become an environmental problem restricting the green and sustainable development of aluminum industry. Based on the industrial composition and leaching toxicity of spent carbon cathodes with different aggregate particle sizes, effects of aggregate particle size and roasting temperature on high-temperature roasting treatment of spent carbon cathodes were explored. The results show that with the increase of aggregate particle size and roasting temperature, the carbon content of recovered carbon material rises continuously and soluble fluoride content drops greatly. Under the optimal high-temperature roasting parameters, carbon content of the recovered carbon material rises from 65.21% to 94.52%, and the fluorine ion concentration drops from 4 018.55 mg/L to 7.63 mg/L. Meanwhile, the condensed gas product was cured by chemical precipitation method and extracted high purity CaF2 product to avoid secondary pollution of high concentration fluorine-containing flue gas. It is feasible to treat spent carbon cathodes of aluminum electrolysis via high-temperature roasting. |
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