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首页> 外文期刊>Clay Minerals: Journal of the Clay Minerals Group of the Mineralogical Society >Enhanced alumina extraction from kaolin by thermochemical activation using charcoal
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Enhanced alumina extraction from kaolin by thermochemical activation using charcoal

机译：Enhanced alumina extraction from kaolin by thermochemical activation using charcoal

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摘要

The present work aims to increase the alumina percentage recovery (APR) extracted from kaolin via the addition of 0.5-4.0 wt. charcoal as a thermochemical fluxing agent in the lime-sintering process at 1260-1360 degrees C. The transformation, microstructural and microtextural changes and self-disintegration performance were characterized using thermogravimetric analysis and differential scanning calorimetry, X-ray diffraction/X-ray fluorescence, scanning electron microscopy coupled with energy-dispersive spectroscopy and laser diffraction particle-size distribution analysis. The optimum enhancement of APR, from 77.7 to 87.40, was obtained by sintering at 1360 degrees C with the addition of 1.5 charcoal. With further increase of the charcoal content to 4, the APR reduced to 75.6. Combustion of 1360 degrees C or with charcoal contents >4 led to mullite crystallization and decreased alumina leachability, thereby reducing the APR. Charcoal is a cost-effective and energy-efficient activator to increase the APR extracted from kaolin.

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