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| Study on phase equilibrium of seawater system at 20 ℃ |
| Liu Qing, Gong Xuemin, Zhang Xiangyi, Li Yajie |
| College of Chemical Engineering, North China University of Science and Technology, Tangshan 063210, China |
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Abstract Seawater contains abundant chemical resources, and the comprehensive utilization of seawater plays an important role in industry, agriculture, national defense construction and people's production and life. Aiming at the extraction and comprehensive utilization of seawater chemical resources, the phase equilibrium characteristics of seawater related systems and the law of evaporation crystallization solid precipitation were studied. The phase equilibrium solubility of Mg2+、Na+//SO42-、Cl--H2O quaternary system at 20 ℃ was determined by isothermal dissolution method, the analysis of phase diagram characteristics shows that five isothermal saturation points and seven crystallization zones were formed in the system. Combined with the change process of water diagram, the process of seawater evaporation and preparation of crystalline NaCl solid phase was analyzed. The phase equilibrium characteristics of seawater system at 20 ℃ provide theoretical basis and technical support for the comprehensive utilization of seawater resources and the processing and separation technology of related salt mineral resources.
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