五元体系LiCl-NaCl-KCl-MgCl_(2)-H_(2)O 25℃时溶度研究和等温蒸发实验

Studies on the Solubility and the Isothermal Evaporation Process in the Quinary System Li,Na,K,Mg/Cl-H_(2)O at 25℃

本文首次给出了五元体系LiCl-NaCl-KCl-MgCl_(2)-H_(2)O 25℃时的溶度图。讨论了氯化锂对体系中其它盐类的盐析作用。还报道了几个合成卤水在静态条件下的等温蒸发结果。研究表明所得平衡相图可作为此类盐卤析盐顺序的理论依据。

The phase diagram of the title quinary system at 25℃has been constructed for the first time.There are five crystallization surfaces corresponding to the eutectic solutions saturated with NaCl and KCl,LiCl·H_(2)O,MgCl_(2)·6H_(2)O,Li-Carnallite and K-Carnallite respectively;the monovariant lines.P3T_(1)(corresponding to NaCl+KCl+K-Carnallite),E_(5)T_(1)(NaCl+KCl+LiCl·H_(2)O),E_(4)P(NaCl+K-Carnallite+MgCl_(2)·6H_(2)O),PT_(2)(NaCl+K-Carnallite+Li-Carnallite),T_(1)T_(2)(NaCl+K-Carnallite+LiCl·H_(2)O),P2P(NaCl+MgCl_(2)·6H_(2)O+Li-Carna-llite),E3T_(2)(NaCl+Li-Carnallitc+LiCl·H_(2)O),E1T_(1)(KCl+LiCl·H_(2)O+K-Car-nallitc),E_(2)T_(2)(LiCl·H_(2)O+Li-Carnallite+K-Carnallite),P1P(MgCl_(2)·6H_(2)O+Li-Carnallite+K-Carnallite),respcctivoly;and three quinary invariant points:T_(1),T_(2),Pcorresponding to the solutions saturated with LiCl·H_(2)O+NaCl+KCl+K-Carnallitc,LiCl·H_(2)O+NaCl+Li-Carnallite+K-Carnallite and Nacl+MgCl_(2)·6H_(2)O+Li-Carnallite+K-Carnallite.The results of studying the isothermal evaporation of mixtures showed that there was not any metastable solid phase occurring in the system and the supersaturation phenomena were unconsidcred.