硼酸溶液中氯柱硼镁石的溶解及相转化动力学

对氯柱硼镁石（2MgO•2B2O3•MgCl2•14H2O）在4.5％H3BO3水溶液40 ℃的溶解及相转化过程进行了动力学研究.对不同时间取出的液相的化学分析及不同阶段分离固相的鉴定结果表明,该复盐在溶解阶段出现与前所报导不同的同步溶解，最终产物是库水硼镁石（2MgO•3B2O3•15H2O）.提出了库水硼镁石的形成条件和溶解及相转化动力学机理，利用单纯形优化法配合Runge-Kutta微分方程组数值解法对实验数据进行处理，给出了转化结晶动力学方程.

Kinetics of Dissolution and Transformation of Chloropinnoite in H3BO3 Aqueous Solution

The kinetics of dissolution and transformation processes of 2MgO•2B2O3•MgCl2•14H2O in 4.5％ H3BO3 aqueous solution at 40 ℃ was studied. The liquid samples were taken at different times for chemical analysis. And the solid phase at different stages was separated and identified. The experimental results showed that 2MgO•2B2O3•MgCl2•14H2O dissolved congruently in 4.5％ H3BO3 aqueous solution, which was different from the process of the dissolution of 2MgO•2B2O3•MgCl2•14H2O in water. The final crystal solid phase was kurnakovite(2MgO•3B2O3•15H2O). The kinetic equations of the crystallization reaction were given with the aid of Simplex Optimum Method and Runge-Kutta digital solution of differential equation system, a mechanism of dissolution and transformation and the formation condition of kurnakovite in Qinghai-Tibetan plateau were proposed and discussed.