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Desilication and Recycling of Alkali-Silicate Solution for Low-Grade High-Silica Bauxite Utilization

  • Recycling Silicon and Silicon Compounds
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Abstract

This study investigated the effects of CaO addition amount, initial caustic and silica concentrations, and reaction temperature on the desilication ratio in an alkali-silicate solution. The optimal desilication conditions for an alkali-silicate solution with active CaO were obtained: caustic solution concentration, 100–110 g/L; initial SiO2 concentration, 7–9 g/L; Ca/Si molar ratio, 1.2; reaction temperature, 368 K; reaction time, 2 h; stirring rate, 300 rpm. The kinetics of the desilication results indicated that the reaction matched the shrinking core model of a liquid–solid multiphase reaction, wherein the apparent activation energy was 29.35 kJ/mol and the control step was solid film diffusion. Ca(OH)2 formed a film on the particle surface, impeding further desilication. After five cycles of desilication, the aluminum-to-silicon ratio (A/S) of the bauxite concentrate was > 7 and that of roasted bauxite was 4.01.

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Acknowledgements

The authors gratefully acknowledge the financial support received from Projects U1812402, 51574095, 51774102, and 51564003, supported by the National Natural Science Foundation of China, and projects Talent Team Giant [2015] 4005 and Platform Talent [2017] 5788, 5626, and KY (2015) 334, supported by the Talents of Guizhou Science and Technology Cooperation Platform.

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Authors and Affiliations

  1. School of Material and Metallurgy, Guizhou University, Guiyang, 550025, Guizhou, China

    Yingpeng Xu, Junqi Li, Chaoyi Chen, Yuanpei Lan & Linzhu Wang

  2. Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, 550025, Guizhou, China

    Yingpeng Xu, Junqi Li, Chaoyi Chen, Yuanpei Lan & Linzhu Wang

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  1. Yingpeng Xu
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  2. Junqi Li
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Correspondence to Junqi Li.

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Xu, Y., Li, J., Chen, C. et al. Desilication and Recycling of Alkali-Silicate Solution for Low-Grade High-Silica Bauxite Utilization. JOM 72, 2705–2712 (2020). https://doi.org/10.1007/s11837-019-03934-6

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  • DOI: https://doi.org/10.1007/s11837-019-03934-6

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