Patent ID: 9309447
Filing Date: 2016-04-12
CPC Classification: C01F,C09G,C09K

Claim Text:
1. A method for recovery of cerium oxide from an abrasive waste composed mainly of cerium oxide which arises from polishing of glass substrates, said method comprising the steps of: (i) adding to the abrasive waste an aqueous solution of a basic substance to form an abrasive waste solution; (ii) adding to the abrasive waste solution a precipitant, thereby forming precipitates composed mainly of cerium oxide, and supernatant liquid, and removing the supernatant liquid; (iii) adding to the precipitates a solution of an acid substance, thereby making said precipitates have a pH value of about 5.5 to 7, and removing the solution of the acid substance; (iv) after removing the solution of the acid substance, washing the precipitates with an organic solvent; and (v) after washing the precipitates with the organic solvent, drying and crushing the precipitates.