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| Preparation of Metallurgical Alumina from Coal Ash with Sulfuric Acid Process |
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Received:April 28, 2013
Revised:April 28, 2013
Accepted:May 03, 2013
Published Online:October 25, 2013
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| DOI：10.3969/j.issn.1007-7545.2013.11.008 |
| KeyWord:coal ash; sulfuric acid method; iron removal; alumina |
| Author | Institution |
| Lv Ying-lu |
贵州大学 材料与冶金学院 |
| Chen Chao-yi |
贵州大学 材料与冶金学院 |
| Mao Zhi-hui |
贵州大学 材料与冶金学院 |
| Song Qiang |
贵州大学 材料与冶金学院 |
| Zhu Ming-yan |
贵州大学 材料与冶金学院 |
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| Abstract: |
| Preparation of metallurgical alumina from coal ash in circulating fluidized bed with sulfuric acid method was studied. The results show that the Al2O3 leaching rate reaches 93.1% under the optimum conditions including temperature of 180 ℃, time of 5 h, initial sulfuric acid mass concentration of 30%, and acid excess coefficient of 1.5. The iron removal rate from crude aluminum sulfate solution is 91.7% by KMnO4 oxidation-precipitation method with coal ash calcined at 500~600 ℃ for 40 min as alkaline agent. The refined aluminum sulfate solution is concentrated, crystallized, and calcined at 1 100 ℃ for 4 h to produce metallurgical alumina which meets YS/T 274-1998 standards, level 1. |
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