高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (2): 189.

• 论文 •    下一篇

2MgO·2B2O3·MgCl2·14H2O-7.8%H3BO3-H2O体系多温相关系研究

刘志宏1,2, 胡满成1, 高世扬1,2   

  1. 1. 陕西师范大学化学与材料科学学院, 西安 710062;
    2. 兰州大学化学化工学院, 兰州 730000
  • 收稿日期:2002-06-05 出版日期:2003-02-24 发布日期:2003-02-24
  • 通讯作者: 刘志宏(1963年出生),男,博士研究生,副教授,从事硼酸盐化学研究.E-mail:l-zhihong@163.net E-mail:l-zhihong@163.net
  • 基金资助:

    国家自然科学基金(批准号:29971032)资助

Phase Relation of 2MgO·2B2O3·MgCl2·14H2O-7.8%H3BO3-H2O System at Various Temperatures

LIU Zhi-Hong1,2, HU Man-Cheng1, GAO Shi-Yang1,2   

  1. 1. School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an 710062, China;
    2. School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
  • Received:2002-06-05 Online:2003-02-24 Published:2003-02-24

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摘要： 研究了2MgO·2B2O3·MgCl2·14H20在不同温度下的7.8%H3BO3水溶液中的相转化产物及其溶解度.IR,XRD,TG及化学分析表明,相转化产物在0～22℃范围内为MgO·2B2O3·9H20;22～68℃为MgO·2B2O3·7.5H20;68～95℃为MgO·2B2O3·7H20;95～98.8℃为MgO·2B2O3·5H20;100～110℃为MgO·B2O3·3H20;110～120℃为2MgO·B2O3·2H20;120～170℃为2MgO·B2O3·1.5H20;170～200℃为2MgO·B2O3·H20.提出了相转化反应原理.

关键词: 氯柱硼镁石, 镁硼酸盐, 相关系

Abstract: The phase relation of 2MgO·2B2O3·MgCl2·14H20-7.8%H3BO3-H20 system at various temperatures has been studied by FTIR spectroscopy, XRD, TG, as well as chemical analyses. The phase transformation product is MgO·2B2O3·9H20 at 0-22 ℃, MgO·2B2O3·7.5 H20 at 22-68 ℃, MgO·2B2O3·7H20 at 68-95 ℃, MgO·2B2O3·5H20 at 95-98.8 ℃, MgO·B2O3·3H20 at 100-110 ℃, 2MgO·B2O3·2H20 at 110-120 ℃, 2MgO·B2O3·1.5H20 at 120-170 ℃, and 2MgO·B2O3·H20 at 170-200 ℃, respectively. The mechanisms of dissolution and phase transformation have been proposed and discussed.

Key words: Chloropinnoite, Mg-borates, Phase relation

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