The invention relates to a method for directly preparing
cerium fluoride by extraction and separation, which comprises the following steps: 1) taking a sulphuric acid
rare earth solution containing quadravalence
cerium and
fluorine or a
nitric acid rare earth solution as a
raw material, using a P507
organic solvent extractant for extraction and separation to obtain organic phase loading quadravalence
cerium and
fluorine; 2) using a stripping liquid prepared by inorganic acid and a
reducing agent for stripping the loaded organic phase obtained in the step 1), reducing the Ce<4+>
ion in the loaded organic phase by a reducing substance in the stripping liquid to Ce<3+>
ion, combining with
fluorine in the loaded organic phase to form
cerium fluoride deposition and then enters in water phase, filtering to obtain the
cerium fluoride powder. The method for directly preparing
cerium fluoride by extraction and separation has the advantages that quadravalence cerium and fluorine in the organic phase are stripped by a cerium
fluoride deposition mode to water phase during the
rare earth extraction
separation process, according to the invention, the separation, purification and material preparation are combined, so that cerium
fluoride deposition preparation process can be omitted, the technology flow can be shortened, the
powder material with controllable
granularity and uniform
particle size distribution can be obtained. The preparation cost is low, fluorine in ore can be effectively recovered and used, and the original auxiliary
material consumption and production cost can be reduced.