Na_3AlF_6-AlF_3-Al_2O_3-CaF_2-LiF-NaCl系电解质密度的研究

研究了电解质中加入氯化钠,并用氯化钠取代部分氟化锂的电解质体系的密度.采用电子天平与计算机串口相结合的测量技术,根据阿基米德定律确定电解质体系的密度,误差小于1%.利用该方法,通过四因素四水平正交实验研究了Na3AlF6-AlF3(10.87%~16.67%)-Al2O3(3%)-CaF2(4%)-LiF(0~6%)-NaCl(0~8%)体系电解质密度,并且根据测量结果建立了该体系的密度数学模型:tρ(g.cm-3)=2.897 1-0.003 07AlF3(w/%)+0.003 041LiF(w/%)-0.009 32NaCl(w/%)-0.000 85t(℃).分析了不同分子比、氟化锂添加...

Study on the Electrolytic Densities of Na3AlF6-AlF3-Al2O3-CaF2-LiF-NaCl System

The density of the aluminum electrolyte system where NaCl was used as an additive to substitute partly for LiF was studied. The electrolytic density was measured by an electronic balance connected to computer port according to the Archimedian law with an error less than 1%. Then, the measured electrolytic densities of Na3AlF6-AlF3 (10.87%-16.67%)-Al2O3-CaF2-LiF (0-6%)-NaCl (0-6%) system were analyzed through a 4-factor/4-level orthogonal experiment to develop a mathematical model based on those experimental results, i.e. ρt (g · cm^-3) = 2.8971-0.003 07AlF3 (w/%) + 0.003041LiF (w/%)-0.00932NaCl (w/%)-0.00085t (°C). The effects of cryolite ratio and LiF and NaCl concentrations on the densities were investigated. The results showed that the addition of NaCl decreases the density of aluminum electrolyte while the addition of LiF increases that of acidic electrolyte, but mixing the two additives properly may get excellent result. The more the NaCl used to substitute for LiF, the lower the electrolytic density.