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Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions

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Abstract

Desilication in the solution with Na2O concentration below 300 g/L was extensively studied, such as various desilication agents mostly of calcium salts or compounds proposed in the literature. However, desilication in high-alkali sodium aluminate solution was necessary in the production of sodium aluminate hydrate (SAH), but much difficult as the high silicate solubility in concentrated caustic solution. Therefore, an effective desilication method was investigated with different mechanism in this paper. The hydroxy-sodalite compound was synthesized and found with excellent desilication properties in highly caustic aluminate solution until 470–530 g/L Na2O, and the desilication mechanism in concentrated sodium aluminate solution was presented firstly. The crystallization reaction of silicate with aluminate in the sodium aluminate solution during the desilication was proposed. It was observed that the aluminate concentration in the concentrated solution considerably affected the desilication. Furthermore, the kinetics equation was inferred as − dσ/dt = exp(29.30–11311/T) (σ)n, with the obtained apparent activation energy and order dependence of 94.04 kJ/mol and 2.47 ± 0.47. Meanwhile, the equilibrium SiO2 concentrations of the synthesized hydroxy-sodalites in the sodium aluminate solutions with 470–530 g/L Na2O at 353–393 K were determined.

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Acknowledgements

This work is supported by the National High Technology Research and Development Program of China (863 Program, No. 2011AA060701).

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Authors and Affiliations

  1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Xiaoduo Jiang, Yifei Zhang & Yi Zhang

  2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Xiaoduo Jiang, Yifei Zhang & Yi Zhang

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Xiaoduo Jiang

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Jiang, X., Zhang, Y. & Zhang, Y. Desilication mechanism and kinetics of synthesized hydroxy-sodalite in high-alkali sodium aluminate solutions. Reac Kinet Mech Cat 127, 489–504 (2019). https://doi.org/10.1007/s11144-019-01565-1

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