LaCl_3-KCl-LiCl三元系统相图的研究

An Investigation on the Phase Diagram of Ternary System LaCl_3-KCl-LiCl

利用DTA研究了LaCl_3—KCI-LiCl三元系统相图.发现该相图由二个赝三元相图构成.相图中有五个液相面,七条二次结晶线,三个三元无变点,它们分别为低共熔点E_1[W(LaCl_3)=0.115,W(KCl)=0.474,W(LiCl)=0.411,345℃],E_2[W(LaCl_3)=0.494,W(KCI)=0.216,W(LiCl)=0.290,410℃]和三元转熔点P[W(LaCl_3)=0.600,W(KCI)=0.108,W(LiCl)=0.292,429℃].

The phase diagram of ternary system LaCl3-KCl-LiCl has been investigated by means of DTA. It was found that the ternary system consist of two pseudoternary system. There are five primary crystallization surfaces, seven secondary crystallization lines, two ternary eutectic points and a ternary peritectic point in the system LaCl3-KCl-LiCl. Three reactions occurred in the system LaCl3-KCl-LiCl are:L = KCl+LiCl+K2LaCl5E1[0.115(W / kg·kg-1)LaCl3, 0.474(W / kg·kg-1)KCl, 0.411(W / kg ·kg-1)LiCl, 345℃]L = K2LaCl5+KLa3Cl10+LiClE2[0.494(W/ kg·kg-1)LaCl3, 0.216(W / kg·kg-1)KCl, 0.290(W / kg ·kg-1)LiCl, 410℃]L+LaCl3 =KLa3Cl10+LiClP[0.600(W / kg·kg-1)LaCl3, 0.108(W / kg·kg-1)KCl, 0.292(W / kg ·kg-1)LiCl, 429℃]