天津科技大学学报2016，Vol.31Issue(4)：40-44,5.DOI:10.13364/j.issn.1672-6510.20150124
三元体系Li+、Mg2+//borate-H2O 288.15,K固液相平衡研究
Solid-liquid Phase Equilibria in the Ternary System Li+,Mg2+//borate-H2O at 288.15,K
摘要
Abstract
The phase equilibrium of the ternary system Li+,Mg2+//borate-H2O has been researched at 288.15,K using an iso-thermal dissolution method.The solubility and physico-chemical properties such as density,refractive index and pH value were analyzed.Based on the experimental data,the phase diagram at 288.15,K and diagrams of physico-chemical properties versus compositions were plotted respectively.The results showed that the ternary system at 288.15,K belongs to hydrate Ⅰ type and no double salt or solid solution was generated.There was one eutectic point(liquid phase composition is Li2B4O7 2.88%, ,MgB4O7 0.02%,);two univariate curves and two crystallization fields(Li2B4O7·3H2O and Mg2B6O11·15H2O).The concentration of MgB4O7,decreased with the increase of the concentration of Li2B4O7,which shows that Li2B4O7,has an salting-out effect on MgB4O7.It was found that MgB4O7·9H2O is unstable at 288.15,K;it easily reacts with water and then converts into Mg2B6O11·15H2O.Physico-chemical properties changed regularly with the increase of Li2B4O7 content.Density and refractive index increased with the increase of the concentration of Li2B4O7,and reached the highest at the eutectic point,then decreased.The values calculated with empirical equations highly matched the experimental values.关键词
稳定相平衡/溶解度/锂硼酸盐/镁硼酸盐Key words
stable phase equilibrium/solubility/lithium borate/magnesium borate分类
化学化工引用本文复制引用
景妍,王士强,胡海清,赵美玲,韩徐年,郭亚飞,邓天龙..三元体系Li+、Mg2+//borate-H2O 288.15,K固液相平衡研究[J].天津科技大学学报,2016,31(4):40-44,5.基金项目
国家自然科学基金资助项目(21276194，U1507109)；天津市应用基础与前沿技术研究计划项目(12JCQNJC03400) （21276194，U1507109）
