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为对高浓度铝酸钠溶液碳酸化分解过程中产品杂质含量的控制提供理论依据,分析了铝酸钠溶液碳酸化分解过程的热力学,认为该过程中Al(OH)3析出的真正机理是过饱和铝酸钠溶液的自发结晶;而基于分解过程中平衡浓度的热力学计算表明,在碳酸化分解过程中SiO2的变化规律与公认的三段变化规律一致,说明该过程产品中SiO2的含量取决于它在溶液中的平衡浓度,而非吸附所致;同时还分析了丝钠铝石的形成热力学。
In order to provide a theoretical basis for the control of the impurity content in the process of carbonation and decomposition of high concentration sodium aluminate solution, the thermodynamics of the process of carbonation and decomposition of sodium aluminate solution was analyzed. The true mechanism of Al (OH) 3 precipitation during this process was considered Saturated sodium aluminate solution spontaneous crystallization; and based on the equilibrium concentration of the thermodynamic calculation of the decomposition process shows that during the carbonation decomposition of SiO2 changes consistent with the accepted three-stage variation, indicating that the process of SiO2 content in the product depends on Its equilibrium concentration in solution, not due to adsorption; also analyzed the formation thermodynamics of the tetrasilite.