Isothermal Evaporating Phase Equilibria in the Quaternary System (LiCl+NaCl+Li2SO4+Na2SO4+H2O)at 348.15 K and 0.1 MPa:An Experimental and Theoretical Study
投稿时间:2019-03-29  修订日期:2019-04-09
DOI:10.12119/j.yhyj.201902006
中文关键词:  
英文关键词:Phase diagram  Solubility  Lithium chloride  Lithium sulfate  Pitzer model
基金项目:
作者单位
GUO Ya-fei College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin, 300457, China
Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin, 300457, China 
YUAN Fei College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin, 300457, China 
LI Long College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin, 300457, China 
WANG Shi-qiang College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin, 300457, China
Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin, 300457, China 
DENG Tian-long College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin, 300457, China
Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin, 300457, China 
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中文摘要:
      
英文摘要:
      The gradient solar pond technique is an economic separating process employed in the inorganic chemical industrial production of salt lake chemical engineering processes. In this paper, a novel isothermal evaporation experimental method was employed to simulate the evaporation phase equilibrium for the reciprocal quaternary system (LiCl+NaCl+Li2SO4+Na2SO4+H2O) at 348.15 K to serve as a useful guide for lithium salt production via the depth solar ponds.The isothermal evaporation equilibrium solubilities and physicochemical properties,including the densities and pH values, were experimentally investigated. The dry-salt phase diagram,water-phase diagram, and the diagram of the physicochemical properties versus composition were plotted with respect to the experimental data. The dry-salt phase diagram consists of three invariant points,seven univariant solubility curves, and five crystallization regions, specifically halite(NaCl,Ha),thenardite (Na2SO4,Th),double salt (Li2SO4·Na2SO4, Db2), lithium sulfate monohydrate (Li2SO4·H2O, Ls), and lithium chloride monohydrate(LiCl·H2O, Lc). Based on Pitzer and its extended HMW model, the Pitzer single salt parameters, mixing ion interaction parameters, and thermodynamic stable equilibrium constants for the quaternary system at 348.15 K were obtained. The calculated phase diagram and experimental isothermal phase diagram at 348.15 K exhibited a great difference. Based on these results, the isothermal evaporation phase diagram can truly reflect the salt sedimentary in salt lakes and can be applied as a useful guide for the solar pond process.
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