Development of an energy-efficient method for aluminum manufacturing is the current research trend in the aluminum electrolysis industry. A low-temperature electrolysis process is an appropriate choice for aluminum electrolysis. The NaF-KF-LiF-AlF3 system with its low cryolite ratio may be a suitable candidate electrolyte system because of its reduced liquidus temperature. In this paper, the liquidus temperature of NaF-KF-LiF-AlF3 system with cryolite ratios of 1.3 and 1.4 is investigated via the cooling curve method and the differential thermal analysis method. The effects of both potassium fluoride and lithium fluoride on the NaF-KF-LiF-AlF3 system are studied. The liquidus curves of systems containing potassium fluoride and lithium fluoride are different and depend on the KF/(NaF+KF+LiF) and LiF/(NaF+KF+LiF) ratios. Part of the (NaF-LiF-AlF3)-KF pseudo-binary phase diagram with fixed LiF concentration is plotted according to the data of liquidus temperature and the compositions of the phase diagram containing potassium fluoride and lithium fluoride with a cryolite ratio of 1.3 are analyzed. The change trend of the compositions is similar to the NaF-KF-AlF3 system with a low cryolite ratio. LiF hardly participate in the formation of the compounds at equilibrium state except for the fact that chiolite is the main composition of molten salt.

中文翻译：

---

低冰晶石比NaF-KF-LiF-AlF3体系液相线温度的研究

开发一种节能的铝制造方法是当前铝电解行业的研究趋势。低温电解工艺是铝电解的合适选择。具有低冰晶石比率的 NaF-KF-LiF-AlF3 系统可能是合适的候选电解质系统，因为它降低了液相线温度。本文通过冷却曲线法和差热分析法研究了冰晶石比为1.3和1.4的NaF-KF-LiF-AlF3体系的液相线温度。研究了氟化钾和氟化锂对 NaF-KF-LiF-AlF3 体系的影响。含氟化钾和氟化锂的体系的液相线曲线不同，取决于 KF/(NaF+KF+LiF) 和 LiF/(NaF+KF+LiF) 的比率。根据液相线温度数据绘制了部分LiF浓度固定的(NaF-LiF-AlF3)-KF伪二元相图，冰晶石比例为1.3的氟化钾和氟化锂相图组成为分析了。组成的变化趋势类似于具有低冰晶石比例的NaF-KF-AlF3体系。LiF 几乎不参与平衡状态下化合物的形成，除了 chiolite 是熔盐的主要成分。组成的变化趋势类似于具有低冰晶石比例的NaF-KF-AlF3体系。LiF 几乎不参与平衡状态下化合物的形成，除了 chiolite 是熔盐的主要成分。组成的变化趋势类似于具有低冰晶石比例的NaF-KF-AlF3体系。LiF 几乎不参与平衡状态下化合物的形成，除了 chiolite 是熔盐的主要成分。