Metastable Phase Equilibrium in the Aqueous Quaternary System (NaCl +MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K

ISL OpenIR > 青海盐湖研究所知识仓储

	Metastable Phase Equilibrium in the Aqueous Quaternary System (NaCl +MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K
	Guo, Yafei; Yin, Hongjun; Wu, Xianghua; Deng, Tianlong
	2010
发表期刊	JOURNAL OF CHEMICAL AND ENGINEERING DATA
ISSN	0021-9568
卷号	55 期号:10 页码:4218-4220
摘要	Experimental studies on the metastable solubilities and physicochemical properties (density, viscosity, pH. and refractive index) of the aqueous quaternary system (NaCl + MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K were determined with the method of isothermal evaporation. On the basis of experimental data, the metastable phase diagram and the diagram of physicochemical properties versus composition were plotted. There are six invariant points, twelve univariant curves, and seven crystallization zones corresponding to halite, thenardite, vanthoffite (3NaSO(4)center dot MgSO4), astrakanite (NaSO4 center dot MgSO4 center dot 4H(2)O), hexahydrite (MgSO4 center dot 6H(2)O), tetrahydrite (MgSO4 center dot 4H(2)O), and bischofite (MgCl2 center dot 6H(2)O). There is no solid solution except two double salts of vanthoffite and astrakanite which existed in the metastable system. When compared with the stable equilibrium phase diagram at 328.15 K. the crystallized zones of loeweite (6Na(2)SO(4)center dot 7MgSO(4)center dot 15H(2)O) and kieserite (MgSO4 center dot H2O) disappeared; the areas of halite and hexahydrite increased: and the areas of thenardite, astrakanite, and vanthoffite decreased. It is indicated that the metastable phenomena of sodium sulfate and magnesium sulfate are significant. The physicochemical properties (density, viscosity. pH. and refractive index) in the metastable equilibrium system change regularly with the mass fraction change of the magnesium ion. Experimental studies on the metastable solubilities and physicochemical properties (density, viscosity, pH. and refractive index) of the aqueous quaternary system (NaCl + MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K were determined with the method of isothermal evaporation. On the basis of experimental data, the metastable phase diagram and the diagram of physicochemical properties versus composition were plotted. There are six invariant points, twelve univariant curves, and seven crystallization zones corresponding to halite, thenardite, vanthoffite (3NaSO(4)center dot MgSO4), astrakanite (NaSO4 center dot MgSO4 center dot 4H(2)O), hexahydrite (MgSO4 center dot 6H(2)O), tetrahydrite (MgSO4 center dot 4H(2)O), and bischofite (MgCl2 center dot 6H(2)O). There is no solid solution except two double salts of vanthoffite and astrakanite which existed in the metastable system. When compared with the stable equilibrium phase diagram at 328.15 K. the crystallized zones of loeweite (6Na(2)SO(4)center dot 7MgSO(4)center dot 15H(2)O) and kieserite (MgSO4 center dot H2O) disappeared; the areas of halite and hexahydrite increased: and the areas of thenardite, astrakanite, and vanthoffite decreased. It is indicated that the metastable phenomena of sodium sulfate and magnesium sulfate are significant. The physicochemical properties (density, viscosity. pH. and refractive index) in the metastable equilibrium system change regularly with the mass fraction change of the magnesium ion.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/1899
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Guo, Yafei,Yin, Hongjun,Wu, Xianghua,et al. Metastable Phase Equilibrium in the Aqueous Quaternary System (NaCl +MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K[J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA,2010,55(10):4218-4220.
APA	Guo, Yafei,Yin, Hongjun,Wu, Xianghua,&Deng, Tianlong.(2010).Metastable Phase Equilibrium in the Aqueous Quaternary System (NaCl +MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K.JOURNAL OF CHEMICAL AND ENGINEERING DATA,55(10),4218-4220.
MLA	Guo, Yafei,et al."Metastable Phase Equilibrium in the Aqueous Quaternary System (NaCl +MgCl2 + Na2SO4 + MgSO4 + H2O) at 323.15 K".JOURNAL OF CHEMICAL AND ENGINEERING DATA 55.10(2010):4218-4220.