Patent ID: 6866784
Filing Date: 2005-03-15
Classification: B24B,Y10S

Abstract:
1. A slurry recycling system for use in a chemical mechanical polishing (CMP) apparatus for polishing a workpiece by using a slurry containing an abrasive, a pH agent and deionized water, the system comprising: a slurry collection tank for storing the slurry used in the CMP apparatus as a recyclable slurry; an ultra filter for separating, from the recyclable slurry, a fluid ingredient containing the pH agent and the deionized water and the abrasive to allow the abrasive to be reintroduced into the slurry collection tank; and a reverse osmosis filter for separating, from the fluid ingredient, the pH agent and the deionized water to allow the pH agent to be reintroduced into the slurry collection tank and to allow the deionized water to be discharged out.