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Title of Journal: Int J Miner Metall Mater

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Abbravation: International Journal of Minerals, Metallurgy, and Materials

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Springer Berlin Heidelberg

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DOI

10.1002/bjs.18003714715

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ISSN

1869-103X

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Thermodynamics and kinetics of alumina extraction

Authors: Ruochao Wang Yuchun Zhai Zhiqiang Ning
Publish Date: 2014/01/26
Volume: 21, Issue: 2, Pages: 144-149
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Abstract

A novel method was developed for extracting alumina Al2O3 from fly ash using an ammonium hydrogen sulfate NH4HSO4 roasting process and the thermodynamics and kinetics of this method were investigated The thermodynamic results were verified experimentally Thermodynamic calculations show that mullite present in the fly ash can react with NH4HSO4 in the 298–723 K range Process optimization reveals that the extraction rate can reach up to 9095 when the fly ash reacts with NH4HSO4 at a 18 mole ratio of Al2O3/NH4HSO4 at 673 K for 60 min Kinetic analysis indicates that the NH4HSO4 roasting process follows the shrinking unreacted core model and inner diffusion through the product layer is the ratecontrolling step The activation energy is calculated to be 16627 kJ/mol and the kinetic equation can be expressed as 1 − 2/3α − 1 − α2/3 = 00374t exp−16627/RT where α is the extraction rate and t is the roasting temperature

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