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| Detoxification Mechanism of Spent Cathode Carbon Blocks by Oxygen Isolation Ultra-high Temperature Thermal Treatment |
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Received:January 13, 2022
Revised:January 23, 2022
Accepted:January 26, 2022
Published Online:April 12, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.05.019 |
| KeyWord:spent cathode carbon blocks; oxygen isolation ultra-high temperature thermal treatment; TGA; thermodynamic analysis |
| Author | Institution |
| LIU Yan |
中南大学 资源加工与生物工程学院 |
| WANG Shuai |
中南大学 资源加工与生物工程学院 |
| LUO You-fa |
矿冶科技集团有限公司 |
| LIU Hai-ying |
矿冶科技集团有限公司 |
| SHEN Shi-fu |
矿冶科技集团有限公司 |
| WANG Jin-ling |
矿冶科技集团有限公司 |
| WANG Li |
中南大学 资源加工与生物工程学院 |
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| Abstract: |
| Spent cathode carbon blocks of aluminum electrolysis is called dangerous solid waste because it contains fluoride and a small amount of cyanide. Direct landfill or stockpiling will do great harm to the environment. The efficient separation and recovery technology of fluorine and carbon from solid waste of aluminum electrolysis cell with continuous oxygen isolation and ultra-high temperature were put forward. The thermal behavior during heat treatment was analyzed by TGA test and thermodynamic simulation, and the occurrence and distribution of cathode carbon blocks before and after roasting were investigated by XRF, XRD and SEM-EDS. The results show that the cyanide in graphite scrap obtained after oxygen isolation ultra-high temperature thermal treatment is fully decomposed, the content of fluoride is only 0.074%, and the content of graphite is 98.53%. |
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