三元体系Li^+、Mg^(2+)∥borate-H_2O323K相平衡研究  

Stable Phase Equilibrium in the Aqueous Ternary System Li^+、Mg^(2+)∥borate-H_2O at 323K

作　　者：李明礼[1,2] 多吉[1,3] 于旭东[1] 曾英[1] 

机构地区：[1]成都理工大学,四川成都610059 [2]西藏地勘局中心实验室,西藏拉萨850033 [3]西藏自治区国土资源厅,西藏拉萨850033

出　　处：《盐业与化工》2014年第10期16-19,共4页Jounral of Salt and Chemical Industry

基　　金：国土资源部公益性项目(201211035-3);国家自然基金(41173071#)

摘　　要：采用等温溶解平衡法,研究了三元体系Li+,Mg2+∥borate-H2O 323 K时的稳定相关系,同时测定了平衡液相的密度和折光率值。根据实验数据,绘制了该三元体系的稳定相图以及密度、折光率组成图。研究结果表明:该三元体系为简单三元体系,无复盐或固溶体生成。稳定相图由1个三元共饱点,2条溶解度单变量曲线和2个单盐结晶区组成。2个结晶区对应的平衡固相分别为Li2B4O7·3H2O和Mg B4O7·9H2O,其中Mg B4O7·9H2O结晶区大于Li2B4O7·3H2O的结晶区。To aim at the composition characteristics of the hot spring in Tibet,the solubility,density and refractive index value of the equilibrated solution in the ternary system Li＋,Mg2 ＋∥borate- H2 O were studied at 323 K using an isothermal dissolution method. Based on the experimental data,the stable phase diagram,the density vs composition diagram,and refractive index vs composition diagram were constructed. Results showed that the ternary system was of a simple eutectic type,no double salt or solid solution formed at 323 K. The phase diagram consists of one invariant point,two univariant curves,and two crystallization regions. The crystallization regions correspond to single salts hungchaoite（ Mg B4O7·9H2O） and lithium tetraborate trihydrate（ Li B4O7·3H2O）,respectively. The crystallization zone of salt Mg B4O7 is larger than the crystallization zone of salt Li B4O7.

关 键 词：稳定相平衡 锂 硼酸盐 等温溶解 

分 类 号：O642[理学—物理化学]