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Phase Equilibria and Chemical Equilibrium of Mg(BO2)2 in MgCl2 Aqueous Solution
Author NameAffiliationE-mail
LI Yao-Yao Tianjin University of Science and Technology College of Chemical Engineering and Materials Science, Tianjin 300457, China  
ZHOU Huan Tianjin University of Science and Technology College of Chemical Engineering and Materials Science, Tianjin 300457, China zhouhuan@tust.edu.cn 
WANG Xing-Fan Tianjin University of Science and Technology College of Marine and Environmental Sciences, Tianjin 300457, China  
WU Peng Tianjin University of Science and Technology College of Marine and Environmental Sciences, Tianjin 300457, China  
ZHANG Min Tianjin University of Science and Technology College of Chemical Engineering and Materials Science, Tianjin 300457, China  
LI Wen-Xuan Tianjin University of Science and Technology College of Marine and Environmental Sciences, Tianjin 300457, China  
YAN Bo Tianjin University of Science and Technology College of Marine and Environmental Sciences, Tianjin 300457, China  
Abstract: 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)42- 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.
Keywords: magnesium metaborate  magnesium chloride  Raman spectroscopy  chemical equilibrium  solution structure
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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.
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Chinese Journal of Inorganic Chemistry