Patent ID: 7722692

Claim:
A method for producing a cerium oxide-based abrasive, comprising: (a) adding a precipitant to an aqueous cerium-containing light rare-earth salt solution to precipitate a light rare-earth salt, thereby obtaining a first slurry containing a light rare-earth salt particle having an average particle diameter of 0.1 to 3 μm; (b) adding a fluorinating agent to a slurry containing a light rare-earth salt particle having an average particle diameter of 0.1 to 3 μm to react the light rare-earth salt with the fluorinating agent, thereby obtaining a second slurry containing a light rare-earth fluoride particle having an average particle diameter of 0.1 to 3 μm; (c) mixing said first slurry and said second slurry to obtain a mixed slurry; and (d) drying and firing said mixed slurry.