The invention belongs to the technical field of
metal purification, and particularly relates to a method for preparing high-purity
metal cesium by using a molecular
distillation apparatus. The method comprises the following steps: industrial-grade
metal cesium (95%) is pretreated, and subjected to vacuum encapsulation into a vacuum feeder, wherein the metal cesium purity reaches 99%; the metal cesium subjected to primary purification is delivered to a
distributor of a knifing molecular
distillation apparatus via the vacuum feeder, uniformly enters a knifing device through distribution holes and forms a uniform liquid film on the
evaporation wall surface; under the conditions that the
distillation temperature is 250 DEG C, the vacuum degree is 1*10<-5>Pa and the rotation speed of the
servomotor is 250-500 r / min, the metal cesium vapor is distilled off from the
evaporation surface and condensed on the surface of a condensation tube by
molecular motion, and the condensate flows downwards along the condensation tube under the action of gravity after reaching a certain amount and enters a collector via a material collection port, thereby obtaining the high-purity metal cesium. The metal cesium produced by the method has the advantages of high purity, high yield, low cost and simple technique, and can easily implement industrialization.