The application of Pr-Nd-Dy alloy in the field of high-performance Nd-Fe-B permanent magnet materials has great potential. The composition of the PrF₃-NdF₃-DyF₃-LiF (PND-LiF) electrolyte system used in the production of Pr-Nd-Dy alloys, the distribution of F, Li, RE and other elements in the electrolyte and their occurrence state were studied in this paper. The effect of temperature and lithium fluoride addition on electrolyte conductivity was revealed using the continuous conductivity cell constant (CVCC) method. The thermal analysis method was used to study the influence of lithium fluoride addition on the electrolyte's liquidus temperature and the optimal process conditions for the production of Pr-Nd-Dy alloy were determined. The results show that the overall distribution of praseodymium neodymium fluoride and lithium fluoride is uniform in the electrolyte and dysprosium fluoride is distributed between praseodymium-neodymium fluoride and lithium fluoride. Praseodymium-neodymium oxide is embedded in praseodymium neodymium fluoride in spotty pattern. The electrolyte's conductivity is increased as the temperature and lithium fluoride addition are going up, while the liquidus temperature is going down with increasing lithium fluoride addition. The best electrolysis process conditions for the PND-LiF system to produce praseodymium neodymium dysprosium alloy are as follows: temperature 1050 °C and 15.56 wt% PrF₃-62.22 wt% NdF₃-11.11 wt% DyF₃-11.11 wt% LiF.

Pr-Nd-Dy合金在高性能Nd-Fe-B永磁材料领域的应用潜力巨大。PrF ₃ -NdF ₃ -DyF _3的组成本文研究了用于生产Pr-Nd-Dy合金的-LiF(PND-LiF)电解液体系，研究了电解液中F、Li、RE等元素的分布及其存在状态。使用连续电导率电池常数 (CVCC) 方法揭示了温度和氟化锂添加对电解质电导率的影响。采用热分析法研究了氟化锂添加量对电解液液相线温度的影响，确定了生产Pr-Nd-Dy合金的最佳工艺条件。结果表明，氟化镨钕和氟化锂在电解液中总体分布均匀，氟化镝分布在氟化镨钕和氟化锂之间。镨钕氧化物以斑点状嵌入氟化镨钕中。电解质的电导率随着温度和氟化锂添加量的增加而增加，而液相线温度随着氟化锂添加量的增加而下降。PND-LiF系统生产镨钕镝合金的最佳电解工艺条件如下：温度1050℃和15.56 wt% PrF₃ -62.22 wt% NdF ₃ -11.11 wt% DyF ₃ -11.11 wt% LiF。