Behavior of SiO2 in the leaching process of alumina clinker with high concentration

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI:10.1016/S1005-8850(08)60101-2

Bin Chen, Xiaobin Li, Guihua Liu

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引用次数: 3

Abstract

It is essential for alumina production by alkaline process to know the behavior of minerals containing Al and Si in basic solution, and the behavior of SiO₂ in the process of clinker leaching is an important portion. To study the behavior of SiO₂ in the process of high concentration clinker leaching, experiments were carried out in home-made reactors. The results indicate that factors, such as temperature, time, Al₂O₃ concentration, as well as SiO₂ concentration, have profound impact on the SiO₂ and Al₂O₃ concentration of pregnant liquor during the high concentration leaching. However, sodium carbonate and free caustic soda concentrations have no remarkable effect on it, thus they are the secondary factors compared with Al₂O₃ concentration. The concentration of SiO₂ in the pregnant liquor could be reduced to a lower level when the major effect parameters of this process are controlled properly.

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高浓度氧化铝熟料浸出过程中SiO2的行为

了解含Al和Si矿物在碱性溶液中的行为是碱法生产氧化铝的必要条件，而SiO2在熟料浸出过程中的行为是碱法生产氧化铝的重要组成部分。为了研究SiO2在高浓度熟料浸出过程中的行为，在国产反应釜中进行了试验研究。结果表明，温度、时间、Al2O3浓度、SiO2浓度等因素对高浓度浸出妊娠液中SiO2和Al2O3浓度影响较大。而碳酸钠和游离烧碱浓度对其影响不显著，与Al2O3浓度相比，它们是次要因素。控制好该工艺的主要影响参数，可使孕液中SiO2的浓度降低到较低水平。

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Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

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