Method For Separating Polishing Material And Regenerated Polishing Material

摘要

Method for separating a polishing material, which is capable of separating and recovering cerium oxide from a used polishing material that is mainly composed of cerium oxide and a regenerated polishing material which can be obtained by the separation method. This method for separating a polishing material is characterized in that a divalent alkaline earth metal salt is added into the slurry of the used polishing material, while controlling the temperature of the slurry within the range of 10-70 DEG C., thereby causing the polishing material to aggregate under such conditions that the mother liquor has a pH of less than 10.0 as the pH is converted to one at 25 DEG C. so that the polishing material is separated from the mother liquor.

主权项

1. A method for separating a cerium oxide containing-abrasive from a used abrasive-containing slurry that contains cerium oxide, the method comprising:
adding a divalent alkali earth metal salt to the used abrasive slurry while a temperature of the used abrasive-containing slurry is regulated in a range from 10 to 70° C.; aggregating the abrasive at a converted pH of lower than 10 of a mother liquid at 25° C.; and separating the abrasive from the mother liquid.