青藏高原钠硼解石在水中溶解动力学和热力学的研究

Study on Kinetics and Thermodynamics of Dissolution of Ulexite in water in Qinghai-Tibet Plateau

本工作采用ｐＨ值，电导率和Ｎａ＋、Ｃａ（２＋）选择电极的电极电位四种物理参数跟踪测定了钠硼解石在１０℃～３５℃纯水中的溶解过程，结合取样进行化学分析和对固相的物相鉴定确定了溶解机制．拟合出溶解动力学方程，计算了Ａｒｒｈａｎｉｕｓ活化能，并根据最终平衡的各离子浓度计算出溶度积常数、溶解度、溶解热和溶解熵等热力学函数．

Dissolution kinetics and thermodynamics of Ulexite in water has been studied by the following the changes in electromotive force of ion selective electrods and the change in conductivity. The solid phase was identified by chemical analyisis. X-ray POwer diffration, IR spectra analysis. From the curves of c￣t. it is considered that the dissolution rate is controlled by interface reaction and calculate Arrhenius energy. Based on the equlibrium concentration. the values of △G, △H. △S and crystallization reaction energy can be calculated.