METHOD OF CRYSTALLISING RARE-EARTH METAL PHOSPHATES FROM WET-PROCESS PHOSPHORIC ACID SOLUTIONS

摘要

FIELD: chemistry.SUBSTANCE: rare-earth metal phosphates are crystallised from supersaturated solutions of wet-process phosphoric acid using a solid seeding material - granular cerium phosphate hemihydrate. Continuous back and forth movement of said seeding material is generated in fluidised bed conditions. The fluidised bed is created by continuous flow of air from the bottom up, opposite to the movement of the wet-process phosphoric acid solution.EFFECT: invention increases the degree of pickup of a concentrate of rare-earth metal phosphates while reducing consumption of seeding material.2 tbl, 1 ex