Chemistry of Borate(非汉字字符)——Crystallization Kinetics of Mg-borates from MgO·nB2O3-18%MgCl2-H2O Supersaturated Solution at 20 ℃

Abstract

Abstract: The MgO·nB₂O₃(n=1, 1.5, 2 and 3)-18%MgCl₂-H₂O supersaturated solution system were prepared and kept at 20 ℃. The crystallization processes of different hydrated Mg-borates from MgO·nB₂O₃-18%MgCl₂-H₂O supersaturated solution have been studied by kinetic method and the crystallization kinetic equations were fitted with the experimental data by computer. There were five solid phases, 2MgO·2B₂O₃·MgCl₂·14H₂O, 2MgO·3B₂O₃·15H₂O, MgO·2B₂O₃·9H₂O, MgO·3B₂O₃·7.5H₂O and MgO·3B₂O₃·7H₂O in the title system. All the solid phases were identified by IR-spectra, X-ray powder diffraction and TG-DTG-DSCthermal analysis.

Key words: Crystallization kinetics, Supersaturated solution, Mg-borate

CLC Number:

O643.12

TrendMD:

ZHU Li-Xia, GAO Shi-Yang, HAO Zhi-Xian, XIA Shu-Ping . Chemistry of Borate(非汉字字符)——Crystallization Kinetics of Mg-borates from MgO·nB₂O₃-18%MgCl₂-H₂O Supersaturated Solution at 20 ℃[J]. Chem. J. Chinese Universities, 2002, 23(9): 1753.

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Chemistry of Borate(非汉字字符)——Crystallization Kinetics of Mg-borates from MgO·nB₂O₃-18%MgCl₂-H₂O Supersaturated Solution at 20 ℃

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