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| Alkali Fixation of Red Mud by Microwave Dry Method and Its Mechanism Analysis |
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Received:September 22, 2022
Revised:September 30, 2022
Accepted:October 08, 2022
Published Online:January 09, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.02.008 |
| KeyWord:red mud; microwave; dry alkali fixation process |
| Author | Institution |
| TIAN Ye |
中铝郑州有色金属研究院有限公司 |
| KANG Ze-shuang |
中铝郑州有色金属研究院有限公司 |
| LIU Zhong-kai |
中铝郑州有色金属研究院有限公司 |
| YAN Kun |
中铝郑州有色金属研究院有限公司 |
| ZHANG Teng-fei |
中铝郑州有色金属研究院有限公司 |
| FAN Ze-kun |
中铝郑州有色金属研究院有限公司 |
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| Abstract: |
| Red mud is a strongly alkaline industrial solid waste produced by the Bayer process bauxite refining. The red mud provided by a Bayer process alumina plant in Zunyi was used as a sample to develop a microwave fast dry alkali fixation process, and the principle was studied. The results show that pH value of red mud can be reduced from 10.88 to 8.11 in only 40 minutes after microwave dry process under the conditions including microwave power of 392 W, microwave frequency of 2 450 MHz, and wavelength of 122 mm. The alkali fixation process does not produce secondary pollutants. The analysis results of XRD and SEM show that composition, appearance color, apparent morphology and particle size of red mud are all change. |
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