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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (9): 1434-1440. 上一篇    下一篇

研究论文

MgO·nB_2O_3-18%MgSO_4H_2O体系0℃时的热力学非平衡态液固相关系

苟国敬;高世扬;夏树屏;朱黎霞;王波   

  1. 中国科学院盐湖研究所西安二部
  • 发布日期:2003-09-15

Liquid-solid Phase Diagram of Thermodynamic Non-equilibrium State of MgO·nB_2O_3-18%MgSO_4-H_2O System at 0 ℃

Gou Guojing;Gao Shiyang;Xia Shuping;Zhu Lixia;Wang Bo   

  1. Institute of Slat Lakes, Chinese Academy of Sciences
  • Published:2003-09-15

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被引次数

1

在MgO·nB_2O_3-18%MgSO_4-H_2O体系0 ℃结晶过程的动力学研究、用物理方 法和化学分析确定析出固相的组成和测定固相共饱和点的基础上，给出了该体系0 ℃时的热力学非平衡态液固相关系图。该相图存在四个相区，分别与H_3BO_3， MgO·3B_2O_3·7.5H_2O，MgO·2B_2O_3·9H_2O和2MgO·3B_2O_3·15H_2O（多水 硼镁石）相对应。结果表明MgCl_2和MgSO_4介质对镁硼酸盐的析出有不同的影响。

关键词: 镁硼酸盐, 相图, 结晶, 动力学研究, 氯化镁, 硫酸镁

The liquid-solid phase diagram of thermodynamic non-equilibrium state of system at 0 °C was given. This result was based on investigation of the crystallization processes of MgO-nB_2O_3- 18%MgSO_4-H_2O system at 0 ℃, identification of the compositions of solid phases by physical method and chemical analysis, and determination of the thermodynamic equilibrium point. There are four fields in this diagram, corresponding to H_3BO_3, MgO· 2B_2O_3·9H_2O (Hungchaoite), MgO·3B_2O_3·7.5H_2O (Meallisterite) and 2MgO·3B_2O_3·15H_2O (Inderite), respectively. Th research results show that MgSO_4 and MgCl_2 have different influence on the crystallization of Mg-borates.

Key words: Mg-borate, PHASE DIAGRAM, CRYSTALLIZE, KINETIC STUDY, MAGNESIUM CHLORIDE, MAGNESIUM SULFATE

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