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Effect of Carbonate on Desilication of Sodium Aluminate Solution at High Temperature

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Abstract

Carbonate is the main anionic impurity in alumina produced by the Bayer process. The phase composition, morphology, and precipitation activity of desilication products (DSPs) precipitated at 245°C in sodium aluminate solution with different carbonate concentrations have been investigated by x-ray diffraction (XRD) and scanning electron microscopy–energy-dispersive x-ray spectroscopy (SEM–EDS) methods. The crystalline DSPs without carbonate are composed of zeolite, sodalite, and hydroxy-sodalite, but only zeolite and cancrinite precipitate in the presence of carbonate. Increasing the carbonate concentration promotes the precipitation of cancrinite but reduces the crystallinity of various DSPs. The cell parameters and the Na2O/Al2O3 ratios of DSPs are significantly increased because of the entry of sodium carbonate during crystallization, especially for the cancrinite. The morphology of various DSPs is greatly changed by the carbonate. The amorphous phase content and precipitation activity of DSPs increase with increasing carbonate concentration. This contributes to the effective removal of carbonate from sodium aluminate solution by controlling the desilication process.

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Acknowledgements

The authors greatly appreciate the financial project supports from the National Natural Science Foundation of China (Nos. 51774079, 22078055, and 51104041) and the Fundamental Research Funds for the Central Universities, China (No. N182508026).

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, People’s Republic of China

    Hongfei Wu, Xiaolin Pan, Haiyan Yu & Shiwen Bi

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, People’s Republic of China

    Hongfei Wu, Xiaolin Pan, Haiyan Yu & Shiwen Bi

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  1. Hongfei Wu
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  2. Xiaolin Pan
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  3. Haiyan Yu
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Correspondence to Xiaolin Pan.

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Wu, H., Pan, X., Yu, H. et al. Effect of Carbonate on Desilication of Sodium Aluminate Solution at High Temperature. JOM 73, 1180–1187 (2021). https://doi.org/10.1007/s11837-021-04568-3

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  • DOI: https://doi.org/10.1007/s11837-021-04568-3

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