Spherical grains of rare earth oxides and a manufacturing method therefor

摘要

Inventive rare earth oxide voidless spherical grains having a mean grain diameter of from about 30-300 mu m formed by agglomerating a rare earth oxide powder having a mean grain diameter of 1 mu m or less are disclosed. An agglomeration method is disclosed comprising slurrying a rare earth oxide powder by dispersing it in water, admixing a salt of an organic acid with the slurry, and spray-drying the slurry.