Experimental Study on Calcification Process of Diaspore Bayer Red Mud

doi:10.12068/j.issn.1005-3026.2018.11.019

Abstract

Abstract:

Large scale utilization of high alkalinity red mud generated in Bayer process is becoming a worldwide problem. Aiming at this problem， a novel calcification-carbonation process is proposed. Firstly， red mud was treated with lime， where the silicon phase is converted into hydrogarnet and alkali is removed. Then， calcification residue is decomposed by CO₂ and alumina is recovered. The effect of calcification temperature， Ca-Si molar ratio， and liquid-solid ratio on alkali content in calcification process were investigated. The results indicate that the w(Na₂O)in red mud reduces from 6.70% to 0.35% at reaction temperature of 160℃， Ca-Si molar ratio of 2.5∶1， liquid-solid ratio of 3∶1. Moreover， the XRD results show that diffraction peak of the alkali in red mud disappears after the calcification transformation， and hydrogarnet is the main phase.

Key words: red mud, calcification, hydrogarnet, alkali, phase transformantion

CLC Number:

X758

XIE Li-qun， ZHANG Ting-an. Experimental Study on Calcification Process of Diaspore Bayer Red Mud[J]. Journal of Northeastern University Natural Science, 2018, 39(11): 1614-1618.

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