The Kinetics of the Formation of Sodium Aluminosilicate Hydrate in Strong Caustic Solutions

Abstract

Abstract: The kinetics of the formation of sodium aluminosilicate hydrate in strong caustic solutions at high mole ratio(between Na₂O and Al₂O₃) were studied. It was one order for Al(OH)₄^- and SiO₂(OH)₂^2- ion respectively. The value of apparent active energy was 86.42 kJ/mol. Based on the analysis of the structure of the aluminate solution and the mechanism of the formation of zeolite, the mechanism of five-ligand intermediate state was set up. It was advantageous for the formation of sodium aluminosilicate hydrate to increase the temperature, or to decrease the caustic concentration, or to intensify the agitation, or to add the seed(or impurities) in the alumina production.

Key words: Sodium aluminosilicate hydrate, Kinetics, Five-ligand intermediate state

CLC Number:

TF821

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LIU Gui-Hua, LI Xiao-Bin, PENG Zhi-Hong, ZHAGN Chuan-Fu . The Kinetics of the Formation of Sodium Aluminosilicate Hydrate in Strong Caustic Solutions[J]. Chem. J. Chinese Universities, 1999, 20(8): 1262.

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The Kinetics of the Formation of Sodium Aluminosilicate Hydrate in Strong Caustic Solutions

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