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| Study on Preparation of Alumina by Two-Step Calcination of Crystalline Aluminum Chloride |
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Received:September 08, 2019
Revised:September 10, 2019
Accepted:September 23, 2019
Published Online:December 18, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2020.01.009 |
| KeyWord:crystalline aluminum chloride; two-step roasting; alumina |
| Author | Institution |
| Li Wenqing |
神华准能资源综合开发有限公司 |
| Zou Ping |
神华准能资源综合开发有限公司 |
| Chi Junzhou |
神华准能资源综合开发有限公司 |
| Liu Darui |
神华准能资源综合开发有限公司 |
| Wu Yongfeng |
神华准能资源综合开发有限公司 |
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| Abstract: |
| Crystalline aluminum chloride in alumina production process by fly ash hydrochloric acid method is calcined and converted into an alumina product, and calcination method has great influence on physical and chemical properties of alumina. Phase transformation of crystalline aluminum chloride at different calcination temperatures was studied, and two-step roasting at low temperature and high temperature and flue gas absorption tests were carried out. The results show that interior of alumina produced by two-step calcination has multi-layered sheet-like loose and porous structure with crystal form of γ-Al2O3, and α-Al2O3 is not formed. Particle size of product is bigger than that of alumina produced by one-step calcination, which is beneficial to alumina electrolysis. Recovery rate of hydrochloric acid is 95.79%, and absorption efficiency of hydrogen chloride in calcined flue gas is high. |
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