GLASS POLISHING COMPOSITION BASED ON CERIUM DIOXIDE AND PREPARATION PROCESS THEREOF Russian patent published in 2011 - IPC C01F17/00 C09G1/02 C09K3/14 

FIELD: chemistry.

SUBSTANCE: invention can be used in polishing glass or materials similar to glass. An inorganic cerium salt or cerium hydroxide containing cerium in amount of 50-100% of the total content of oxides of rare-earth elements is suspended in an aqueous medium. The obtained aqueous suspension is treated with an acid or a salt of an acid selected from a group comprising HF, H₃PO₄ and H₂SO₄. Solid particles are separated from the aqueous medium, annealed at temperature 750-1200°C and ground to 0.5-5.0 mcm grains. The oxide of the rare-earth element added to the suspension can be a precursor compound, e.g. a hydroxide, chloride or nitrate of a rare-earth element. The polishing composition based on the obtained cerium dioxide contains the following in wt %:fluoride 0.5-14; phosphorus in terms of P₂O₅ 0.5-5; sulphur in terms of SO₃ 0.3-5.

EFFECT: invention enables to obtain a polishing compound with high stock removal rate.

8 cl, 15 dwg, 8 ex