物理化学学报 >> 2005, Vol. 21 >> Issue (10): 1161-1163.doi: 10.3866/PKU.WHXB20051020

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MgO•3B2O3-18%MgSO4-H2O过饱和溶液析出固相组成和机理研究

闫长领; 卢雁; 周建国   

  1. 河南师范大学化学与环境科学学院, 河南 新乡 453007; 兰州大学化学化工学院, 兰州 730000
  • 收稿日期:2005-01-21 修回日期:2005-04-05 发布日期:2005-10-15
  • 通讯作者: 卢雁 E-mail:yanlu2001@sohu.com

Study on the Composition and Mechanism of Precipitated Solid Phases from MgO•3B2O3-18%MgSO4-H2O Supersaturated Solution

YAN Chang-ling; LU Yan; ZHOU Jian-guo   

  1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang Henan 453007; Department of Chemistry, Lanzhou University, Lanzhou 730000
  • Received:2005-01-21 Revised:2005-04-05 Published:2005-10-15
  • Contact: LU Yan E-mail:yanlu2001@sohu.com

摘要: 针对青藏高原盐湖卤水析盐过程的特点, 模拟合成MgO•3B2O3-18%MgSO4-H2O过饱和溶液, 在150 ℃水热条件下对析出固相进行研究. 用化学分析方法、X射线衍射、红外光谱进行物相鉴定. 提出了可能的结晶反应机理, 分析了水热温度对析出物相的影响及MgSO4对硼酸镁盐的盐溶效应随水热温度的变化.

关键词: 水热温度, 过饱和溶液, 硼酸镁盐, 结晶机理

Abstract: The supersaturated solution of MgO•3B2O3-18%MgSO4-H2O was prepared and reacted under hydrothermal conditions at 150 ℃. The solid phases precipitated from the supersaturated solution at different times were identified by chemical analysis, XRD, FT-IR. The results show that the reaction process is unique. The precipitated solid phases of 1 to 5 days were mainly szaibelyite and they gradually dissolved with reaction proceeded. At the same time new solid phases also appeared which composed of MgSO4•H2O and MgSO4•1.25H2O. The latter was an intermediate with less amount. The former was final product. Based on these results the crystallization mechanism of szaibelyite under the hydrothermal conditions and discussed the effects of hydrothermal temperature on the composition of precipitated solid phases was proposed.

Key words: Hydrothermal temperature, Supersaturated solution, Mg- borate, Crystallization mechanism