|
| Treatment of Spent Carbon Cathodes from Aluminum Electrolysis by High Pressure Alkali Leaching |
|
Received:March 21, 2022
Revised:March 22, 2022
Accepted:March 25, 2022
Published Online:June 17, 2022
|
| View Full Text View/Add Comment Download reader |
| DOI：doi：10.3969/j.issn.1007-7545.2022.07.006 |
| KeyWord:aluminum electrolysis; spent carbon cathodes; high pressure alkali leaching; recovered carbon; leaching toxicity |
| Author | Institution |
| XIONG Feng |
贵州师范大学材料与建筑工程学院 |
| TIAN Jing-hui |
贵州师范大学材料与建筑工程学院 |
| LIU Weng-fang |
贵州师范大学材料与建筑工程学院 |
| ZU Zhao |
贵州师范大学材料与建筑工程学院 |
| CHEN Lang |
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 |
|
| Hits: 1472 |
| Download times: 1924 |
| Abstract: |
| Spent carbon cathodes from aluminum electrolysis were treated by high pressure alkali leaching. Effects of NaOH concentration, alkali leaching temperature, L/S, and reaction time on treatment of spent carbon cathodes were studied. The changes of phase composition, element content, leaching toxicity, microscopic morphology, and element distribution of spent carbon cathodes before and after treatment were explored by XRD, XRF, leaching toxicity analysis, and SEM-EDS. The results show that with the increase of NaOH concentration, carbon purity and F- leaching concentration of recovered carbon rises first and then drops, and drops first and then rises, respectively. With the increase of alkali leaching temperature, L/S and reaction time, the carbon purity of recovered carbon rises gradually, and F- leaching concentration drops continuously. Under the optimal process conditions, carbon content of spent carbon cathodes rises from 60.02% to 88.63%, and fluoride ion leaching concentration drops from 2 699.95 mg/L to 22.19 mg/L, and the cryolite product is successfully extracted from leachate by carbonation decomposition method. High-pressure alkali leaching process is technically feasible to realize the harmless and resource recovery of spent carbon cathodes. |
| Close |
|
|
|