Patent ID: 6527969
Filing Date: 2003-03-04
Classification: B01D,B24B

Abstract:
A method for rejuvenating a polishing slurry to be applied to a chemical-mechanical polishing apparatus for performing chemical-mechanical polishing of wafer, and to be applied to a rejuvenating apparatus, which recovers waste generated by the chemical-mechanical polishing apparatus, rejuvenates polishing slurry, and supplies the rejuvenated polishing slurry to the chemical-mechanical polishing apparatus, the method comprising the steps of:a) separating a high-concentration waste, which contains contaminants at high concentrations discharged from the chemical-mechanical polishing apparatus during polishing, from a low-concentration waste, which contains contaminants at low concentrations discharged from the chemical-mechanical polishing apparatus during rinsing, b) neutralizing the low-concentration waste by a neutralizing agent, thereafter rinsing the rejuvenating apparatus using the neutralized low-concentration waste, c) recovering the polishing slurry from the high-concentration waste; d) re-dispersing abrasive grains contained in the polishing slurry recovered; and e) mixing the re-dispersed high-concentration waste with fresh polishing slurry, thereafter supplying to the chemical-mechanical polishing apparatus.