天津天佑城项目招商手册PPT课件.pptx

同时,应用结合 Pitzer 理论以及改进的 H-W 公式,对 25℃时四元体系 K+, Mg2+//Cl-, SO42- - H2O 的稳定平衡溶解度进行了理论计算,与实验值进行了对比, 获得了满意的效果。
关键词:水盐体系,介稳相平衡,钾盐
Abstract
Metastable equilibria of the quaternary system (K+, Mg2+//Cl-, SO42- - H2O) at 50℃ and the ternary system (K2SO4 -
MgSO4 - H2O) at 50℃ and 75℃
Introduction of the author: Daiwei CHEN, who is a male and was born in March, 1983, graduated from Chengdu University of Technology in Analytical Chemistry Major directed by Professor Tianlong DENG, and was granted the Master Science Degree in June, 2010.
Abstract
In the thesis, the metastable equilibria of the quaternary system (K+, Mg2+//Cl-, SO42- - H2O) at 50℃ and the ternary system (K2SO4 - MgSO4 - H2O) at 50℃ and 75℃ have been studied using the isothermal evaporation method. The solubilities and physicochemical properties including density, refractive index, viscosity and pH in the solutions were determined. On the base of the experimental data, the phase diagram of the ternary system and the dry-salt diagram, water-phase diagram of the quaternary system were drawn, respectively. The diagrams of physicochemical properties positions both in the metastable ternary and quaternary systems were plotted.
In the metastable phase diagrams of the ternary system (K2SO4 - MgSO4 - H2O) at 50℃ and 75℃, there are all in two invariant point, three solubility curves, and three crystallization zones corresponding to K2SO4, MgSO4·6H2O and K2SO4·MgSO4·4H2O. They both are belonging to a hydrate type Ⅱ with double salts formed. pared with the stable and metastable diagram at the same temperatures of 50℃ and 75℃, respectively, it was found that there are the same crystallization zones and solubility curves at 50℃, those results demonsteated that the ternary system’s metastable behavior is quite weak; the K2SO4·2MgSO4 crystallization zone dispeared in the metastable diagram at 75℃, the MgSO4·H2O crystallization zone converted into MgSO4·6H2O, the MgSO4·6H2O and K2SO4·MgSO4·4H2O crystallization zone are en