Alkaline digestion behavior and alumina extraction from sodium aluminosilicate generated in pyrometallurgical process

Bo-na Deng; Guang-hui Li; Jun Luo; Jing-hua Zeng; Ming-jun Rao; Zhi-wei Peng; Tao Jiang

doi:10.1007/s12613-018-1692-6

Volume 25 Issue 12

Dec. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(12): 1380-1388

Bo-na Deng, Guang-hui Li, Jun Luo, Jing-hua Zeng, Ming-jun Rao, Zhi-wei Peng, and Tao Jiang, Alkaline digestion behavior and alumina extraction from sodium aluminosilicate generated in pyrometallurgical process, Int. J. Miner. Metall. Mater., 25(2018), No. 12, pp. 1380-1388. https://doi.org/10.1007/s12613-018-1692-6

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Bo-na Deng, Guang-hui Li, Jun Luo, Jing-hua Zeng, Ming-jun Rao, Zhi-wei Peng, and Tao Jiang, Alkaline digestion behavior and alumina extraction from sodium aluminosilicate generated in pyrometallurgical process, Int. J. Miner. Metall. Mater., 25(2018), No. 12, pp. 1380-1388. https://doi.org/10.1007/s12613-018-1692-6

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Research Article

Alkaline digestion behavior and alumina extraction from sodium aluminosilicate generated in pyrometallurgical process

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Corresponding authors:
Guang-hui Li E-mail: liguangh@csu.edu.cn

Jun Luo E-mail: luojun2013@csu.edu.cn
Received: 23 March 2018; Revised: 27 May 2018; Accepted: 11 June 2018

Abstract

Abstract

In pyrometallurgical process, Al-and Si-bearing minerals in iron and aluminum ores are easily transformed into sodium aluminosilicates in the presence of Na₂O constituents, which alters the leaching behaviors of Al₂O₃ and SiO₂. It was confirmed that sodium aluminosilicates with different phase compositions synthesized at various roasting conditions were effectively digested in the alkaline digestion process. Under the optimum conditions at temperature of 100-120℃, liquid-to-solid ratio (L/S) of 10:2 mL/g, caustic ratio of 4, and Na₂O concentration of 240 g/L, the actual and relative digestion ratio of Al₂O₃ from the synthesized sodium aluminosilicates reached maximums of about 65% and 95%, respectively, while SiO₂ was barely leached out. To validate the superior digestion property of sodium aluminosilicate generated via an actual process, the Bayer digestion of an Al₂O₃-rich material derived from reductive roasting of bauxite and comprising Na_1.75Al_1.75Si_0.25O₄ was conducted; the relative digestion ratio of Al₂O₃ attained 90% at 200℃.
- alumina;
- sodium aluminosilicate;
- roasting;
- alkaline digestion;
- Bayer process

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