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Phase Equilibria and Chemical Equilibrium of Mg(BO2)2 in MgCl2 Aqueous Solution |
Author Name | Affiliation | E-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 | |
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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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