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| Phase Transformation Behavior of Calcium-bearing Minerals in High-alumina Fly Ash |
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Received:October 18, 2019
Revised:October 23, 2019
Accepted:October 25, 2019
Published Online:February 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.03.017 |
| KeyWord:fly ash; phase transformation; calcium sulfate; acid leaching; alumina |
| Author | Institution |
| WANG Yan |
东北大学 冶金学院 |
| JIANG Yi |
东北大学 冶金学院 |
| JIANG Chuan-ning |
东北大学 冶金学院 |
| CAO Run-bin |
东北大学 冶金学院 |
| GENG Xue-zhe |
东北大学 冶金学院 |
| PAN Xiao-lin |
东北大学 冶金学院 |
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| Abstract: |
| Based on mineral characteristics of high-alumina fly ash, effects of type and dosage of transforming agent, temperature, time and L/S on conversion behavior of calcium-bearing minerals in high-alumina fly ash were studied, and a new process to prepare Al-Si alloy from high-alumina fly ash was proposed. The results show that total content of Al2O3 and SiO2 in high-alumina fly ash is 70% above, and Ca element in fly ash mainly exists in forms of CaSO4 and 2CaO?Al2O3?SiO2. Transformation of calcium-containing minerals has almost no influence on loss rate of alumina in subsequent acid leaching process to remove impurities, but greatly improves calcium removing rate. Calcium removing rate is 90% above under the optimum conditions for phase conversion of calcium-containing minerals including dosage of conversion agent of Na2CO3 of twice theoretical amount, transformation temperature of 60 ℃, reaction time of 1.5 h, and L/S=4. |
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