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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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University of Science and Technology Beijing

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DOI

10.1016/0032-3861(96)00322-9

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ISSN

1869-103X

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Recovery of alkali and alumina from Bayer red mud

Authors: Xiaofeng Zhu Tingan Zhang Yanxiu Wang Guozhi Lü Weiguang Zhang
Publish Date: 2016/02/27
Volume: 23, Issue: 3, Pages: 257-268
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Abstract

Red mud produced in the Bayer process is a hazardous solid waste because of its high alkalinity however it is rich in valuable components such as titanium iron and aluminum In this study a novel calcification–carbonation method was developed to recover alkali and alumina from Bayer red mud under mild reaction conditions Batch experiments were performed to evaluate the potential effects of important parameters such as temperature amount of CaO added and CO2 partial pressure on the recovery of alkali and alumina The results showed that 952 alkali and 750 alumina were recovered from red mud with decreases in the mass ratios of Na2O to Fe2O3 and of Al2O3 to Fe2O3 from 042 and 089 to 002 and 022 respectively The processed red mud with less than 05wt Na2O can potentially be used as a construction material

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