MgO-B_2O_3-28%MgCl_2-H_2O体系0℃热力学非平衡态相图  

Phase Diagram of Thermodynamic Non-equilibrium State of MgO-B_2O_3-28%MgCl_2-H_2O System at 0℃

作　　者：朱黎霞[1] 高世扬[1] 李新[1] 王波[1] 夏树屏[1] 

机构地区：[1]中国科学院青海盐湖研究所西安二部,西安710043

出　　处：《无机化学学报》2003年第5期491-496,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助课题(No.29971032;20271051)。

摘　　要：采用结晶动力学方法对MgO-B2O3-28%MgCl2-H2O体系0℃时过饱和溶液的结晶过程进行了研究,结晶析出固相通过化学分析确定了组成,并用X-射线粉末衍射和红外光谱等对其进行了表征。给出了该体系0℃时的热力学非平衡态相图。该相图有4个相区,分别与H3BO3、MgO·3B2O3·7.5H2O、2MgO·2B2O3·MgCl2·14H2O和3Mg(OH)2·MgCl2·8H2O相对应。The crystallization processes of hydrated magnesium borates, boric and Mg oxychloride from MgO B2O3 28%MgCl2 H2O supersaturated solution at 0℃ have been studied by kinetic method. The crystallization solid phases were characterized by X ray powder diffraction, IR spectra and chemical analysis. The liquid solid phase diagram of thermodynamic non equilibrium state of MgO B2O3 28%MgCl2 H2O system at 0℃ has been given. In this phase diagram, there exist four crystallization fields, boric acid(H3BO3), Macallisterite(MgO·3B2O3·7.5H2O), chloropinnoite(2MgO·2B2O3·MgCl2·14H2O) and magnesium oxychloride (3Mg(OH)2·MgCl2·8H2O).

关 键 词：结晶动力学 热力学非平衡态 相图 硼酸盐 盐湖 地球化学 

分 类 号：TS31[轻工技术与工程]