2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O体系30℃相平衡  

Phase Equilibrium of 2MgO·2B_2O_3·MgCl_2·14H_2O-H_3BO_3-H_2O System at 30 ℃

作　　者：刘志宏[1] 高世扬[1] 胡满成[1] 史鹏[1] 范承[1] 夏树屏[2] 

机构地区：[1]陕西师范大学化学与材料科学学院,西安710062 [2]中国科学院盐湖研究所二部,西安710043

出　　处：《化学学报》2002年第5期854-858,共5页Acta Chimica Sinica

基　　金：国家自然科学基金 (No .2 99710 32 )资助项目

摘　　要：用相平衡方法研究了 2MgO·2B2 O3 ·MgCl2 ·14H2 O在 30℃不同浓度H3 BO3 水溶液中的溶解转化产物及其溶解度 .结果表明 ,氯柱硼镁石的溶解转化产物 ,在H3 BO3 质量分数≤ 2 .5 0 %时为多水硼镁石 ;在 2 .5 0 %～ 5 .0 0 %H3 BO3范围时为库水硼镁石 ;当H3 BO3 量在 5 .0 0 %～ 5 .6 0 %之间时为章氏硼镁石 ;而当H3 BO3 量≥ 5 .6 0 %时为三方硼镁石 .The phase equilibrium of 2MgO·2B 2O 3·MgCl 2·14H 2O-H 3BO 3-H 2O system at 30 ℃ has been studied. The experimental results indicate that the phase transformation product is inderite (2MgO·3B 2O 3·15H 2O) when the mass fraction of H 3BO 3 is in the range from 0% to 2.50%, kurnakovite (2MgO·3B 2O 3·15H 2O) from 2.50% to 5.00%, hungtsaite (MgO·2B 2O 3·9H 2O) from 5.00% to 5.60% , successively. When the mass fraction of H 3BO 3 is higher than 5.60%, the macallisterite (MgO·3B 2O 3·7.5H 2O) crystallizes from the solution. The mechanisms of dissolution and phase transformation have been proposed.

关 键 词：氯柱硼镁石 硼酸 库水硼镁石 相平衡 盐湖 水合硼酸镁盐 

分 类 号：TS311[轻工技术与工程] O642.42[理学—物理化学]