Citation: LI Yao-Yao, ZHOU Huan, WANG Xing-Fan, WU Peng, ZHANG Min, LI Wen-Xuan, YAN Bo. Phase Equilibria and Chemical Equilibrium of Mg(BO₂)₂ in MgCl₂ Aqueous Solution[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(8): 1421-1429. doi: 10.11862/CJIC.2020.141 shu

Phase Equilibria and Chemical Equilibrium of Mg(BO₂)₂ in MgCl₂ Aqueous Solution

LI Yao-Yao ¹ ,
ZHOU Huan ^1,, ,
WANG Xing-Fan ² ,
WU Peng ² ,
ZHANG Min ¹ ,
LI Wen-Xuan ² ,
YAN Bo ²

1.
Tianjin University of Science and Technology College of Chemical Engineering and Materials Science, Tianjin 300457, China
2.
Tianjin University of Science and Technology College of Marine and Environmental Sciences, Tianjin 300457, China

Corresponding author: ZHOU Huan, zhouhuan@tust.edu.cn
Received Date: 19 October 2019
Revised Date: 13 April 2020

Figures(10)

The solid liquid phase equilibria and species chemical equilibrium of Mg(BO₂)₂ dissociated in MgCl₂ aqueous solution were studied by means of Raman spectroscopy and X ray diffraction (XRD). The results indicate that the MgCl₂ concentration has a great influence Mg(BO₂)₂ dissociation. (1) With the increasing of MgCl₂ concentration from 0 to saturated state, the apparent solubility of Mg(BO₂)₂ increased from 0.79% to 1.96%, and pH value decreased from 9.96 to 6.27; (2) Solid species are changed gradually from Mg₂B₆O₁₁·15H₂O and Mg(OH)₂, to Mg₂B₆O₁₁·15H₂O and Mg₃Cl₂(OH)₄·4H₂O; (3) Main species of polylobate anions change from B₄O₅(OH)₄^2- and B₃O₃(OH)₄^- with the accounts of 49.81% and 19.54%, to B₃O₃(OH)₄^- and B₅O₆OH)₄^- with accounts of 44.57% and 40.00%, respectively.
- magnesium metaborate,
- magnesium chloride,
- Raman spectroscopy,
- chemical equilibrium,
- solution structure
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沈阳化工大学材料科学与工程学院沈阳 110142

Phase Equilibria and Chemical Equilibrium of Mg(BO2)2 in MgCl2 Aqueous Solution

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通讯作者: 陈斌, bchen63@163.com

Phase Equilibria and Chemical Equilibrium of Mg(BO₂)₂ in MgCl₂ Aqueous Solution