The RE fluoride can be prepared directly from oxalate by adding hydrofluoric acid .The ratio of transformation and recovery is high if the hydrofluoric acid is added by 120% theoretical amounts.

• 稀土草酸盐中直接加氢氟酸置换生成氟化稀土,选择加入120%25理论量的氢氟酸有较高的转化率和回收率。