CaF_2与NdCl_3对镁电解物理化学性质的影响

测定了CaF2与NdCl3对镁电解质18%MgCl2-25?Cl2-37%NaCl-20%KCl物理化学性质(初晶温度、电导率及密度、表面张力)的影响.实验结果表明,添加CaF2显著增加了熔盐表面张力,一定程度增加了熔盐的初晶温度和密度,但在添加量小于4%时变化不大,已能满足电解工艺对电解质密度的要求.添加NdCl3对电解质的密度和初晶温度有一定影响,但添加量小于5%时影响很小,而对表面张力和电导率几乎没有影响.

The Influence of CaF_2 and NdCl_3 on Physicochemical Properties of Mg-containing Electrolyte

The influence of CaF2 and NdCl3 on physicochemical properties of Mg-containing electrolyte for magnesium electrolysis was studied.The composition of the used molten salt was 18%MgCl2-25?Cl2-37%NaCl-20%KCl.The crystallized temperature,density,conductivity and surface tension of the molten electrolyte with addition of CaF2 and NCl3 were measured.The results show that the influence of CaF2 on the surface tension of molten salts is obvious.The surface tension changes from 1.02 to 1.39 N/m when the content of CaF2 is increased from 0 to 5%.The crystallized temperature and density changes slightly when the content of CaF2 is low.The influence of NdCl3 on physico-chemical properties of the melt salt is not remarkable.