Patent ID: 6604849
Filing Date: 2003-08-12
Classification: B01F,B24B

Abstract:
A slurry dilution system capable of diluting slurry in-situ to any desired level of concentration, the slurry dilution system comprising:a first pipeline having an inlet for feeding raw slurry into the slurry dilution system; a second pipeline having an inlet for feeding de-ionized water into the slurry dilution system; a first flow meter installed somewhere along the first pipeline for measuring a rate of flow for raw slurry; a second flow meter installed somewhere along the second pipeline for measuring a rate of flow for de-ionized water; a delivery pipeline having an inlet, wherein the delivery pipeline inlet is connected to both an outlet of the first pipeline and an outlet of the second pipeline, and a delivery pipeline outlet is connected to a chemical-mechanical polishing station; an ultrasonic vibrator installed near a first terminal of the delivery pipeline for mixing and homogenizing the raw slurry and the de-ionized water and preventing slurry particles from sticking on pipe walls and from clustering so that mixing efficiency is improved; and a mixer installed near a second terminal of the delivery pipeline for preventing the slurry particles from settling, wherein the delivery pipeline includes at least one turning region between the ultrasonic vibrator and the mixer, and a U-shape region at the first terminal directly connecting with the outlet of the first pipeline and the outlet of the second pipeline.