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| Digestion Kinetics of Sintered Clinker to Extract Alumina from Fly Ash with Ammonium Hydrogen Sulfate Roasting Process |
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Received:March 29, 2013
Revised:April 01, 2013
Accepted:April 02, 2013
Published Online:August 22, 2013
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| DOI：10.3969/j.issn.1007-7545.2013.09.007 |
| KeyWord:ammonium hydrogen sulfate; roasting; fly ash; digestion process; kinetics; activation energy |
| Author | Institution |
| WANG Ruo-chao |
东北大学材料与冶金学院 |
| ZHAI Yu-chun |
东北大学材料与冶金学院 |
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| Abstract: |
| The digestion kinetics of sintered clinker to extract alumina from fly ash with ammonium hydrogen sulfate roasting process was investigated. The effects of temperature, stirring intensity and mass ratio of liquid to solid (L/S) on aluminum dissolution rate were studied. The results show that digestion process is controlled by external diffusion. The digestion process includes the first stage for 0~20 min, and the second stage for following 20~60 min. The activation energies of the two stages are 8.013 kJ/mol and 4.973 kJ/mol respectively. The aluminum dissolution rate reaches 93% under the optimal conditions including temperature of 90 ℃, stirring intensity of 300 r/min, L/S of 9∶1 and duration of 60 min. |
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