物理化学学报 >> 2004, Vol. 20 >> Issue (03): 306-308.doi: 10.3866/PKU.WHXB20040318

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水热条件硼酸镁盐过饱和水溶液的相转化

周建国;闫长领;卢雁;高世扬;夏树屏   

  1. 河南师范大学化学与环境科学学院,新乡 453002;兰州大学化学系,兰州 730000;中国科学院盐湖研究所西安二部,西安　710043
  • 收稿日期:2003-07-09 修回日期:2003-10-15 发布日期:2004-03-15
  • 通讯作者: 周建国 E-mail:zhoujgwj@sina.com

Phase Transformation of Supersaturated Solution of MgO•3B2O3-H2O under Hydrothermal Condition

Zhou Jian-Guo;Yan Chang-Ling;Lu Yan;Gao Shi-Yang;Xia Shu-Ping   

  1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang　453002;Department of Chemistry, Lanzhou University　730000;Xi’an Branch, Institute of Salt Lake, Chinese Academy of Sciences, Xi’an　710043
  • Received:2003-07-09 Revised:2003-10-15 Published:2004-03-15
  • Contact: Zhou Jian-Guo E-mail:zhoujgwj@sina.com

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摘要： 针对中国盐湖硼资源特点,模拟合成MgO•3B2O3-H2O过饱和溶液,在120 ℃水热条件下对固相析出的过程进行跟踪.析出固相采用化学分析方法、X射线衍射、红外光谱进行物相鉴定.对析出固相的相转化反应机理进行了探讨,结合有关实验分析了MgSO4对固相析出的影响.

关键词: 水热条件, 过饱和溶液, 硼酸镁盐, 相转化

Abstract: Supersaturated solution of MgO•3B2O3-H2O was prepared and kept under hydrothermal condition at 120 ℃.The solid phases separated from MgO•3B2O3-H2O supersaturated solution were identified by means of chemical analysis, XRD and IR. The process was a phase transformation of Mg-borates. Two amorphous intermediate-products are 2MgO•3B2O3•5H2O and MgO•B2O3•3H2O and the final product is the crystalling 2MgO•B2O3•H2O.The mechanism of phase transformation was proposed and the function of MgSO4 in the supersaturated solution of MgO•3B2O3-18％MgSO4-H2O was discussed.

Key words: Hydrothermal condition, Supersaturated solution, Mg-borate, Phase transformation