Apparent Molar Volumes of Aqueous Solutions of Magnesium Teraborate from 283.15 to 363.15 K and 0.1 MPa
作者单位：Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials Science Tianjin University of Science and Technology College of Chemistry and Materials Science Northwest University
会议名称：《中国化学会第六届全国热分析动力学与热动力学学术会议》
会议日期：2017年
学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
基 金：Financial supports from the National Natural Science Foundation of China(U1607123,U1407113 and U1507112) The Yangtze Scholars and Innovative Research Team in University of Ministry of Education of China(IRT_17R81) the Chinese Postdoctoral Science Foundation(2016M592827)
关 键 词：Density Apparent molar volume Magnesium tetraborate Pitzer model
摘 要：Magnesium borates not only occupy an important position in the modern inorganic salt industry, but also have been widely used in ceramic industry, national defense industry, high technology industry for their excellent characteristics. Salt-lake brines with high concentrations of magnesium and boron in Qinghai-Tibet plateau are well known around the world, and consist of various of hydrated magnesium borates minerals, and consist of various of hydrated magnesium borates minerals, So it is highly desirable to study the thermodynamic properties of apparent molar volumes and construct the thermodynamic model for the binary systems containing magnesium and *** this paper, densities of magnesium teraborate(MgBO) aqueous solutions in the(0.00556-0.03341) mol·kg-1 concentration were measured at a 5 K interval from 283.15 to 363.15 K and 0.1 MPa. Apparent molar volumes were obtained based on the experimental density data, which was measured by Anton Paar vibrating-tube densimeter. On the basis of the experimental and calculated data, the 3D diagrams of the density(ρ) and apparent molar volume(V) corresponding to concentration and temperatures were plotted. The Vogel-Tamman-Fulcher equation for density and Pitzer equation for apparent molar volume were parameterized on the basis of the experimental *** to the Pitzer ion-interaction equation of the apparent molar volume model, the temperature correlations of Pitzer single-salt parameters of MgBO were obtained for the first time.