Patent ID: 8387902
Filing Date: 2013-03-05
Classification: B24B

Abstract:
1. A recycling method of slurry for use in wafer polishing for reusing the slurry used in a polishing process of semiconductor wafer, comprising the steps of: using a recycling apparatus comprising a storage tank for storing a recovered used-slurry, a shear force imparting device and a foreign substance removing device, wherein the shear force imparting device and the foreign substance removing device are arranged in a sequence of the shear force imparting device and the foreign substance removing device along a pathway through which the used slurry is supplied from the storage tank to a wafer polishing machine; adding a dispersant to a recovered used-slurry in the storage tank to inhibit aggregation of the slurry; breaking up aggregates in such a manner that the whole of the used slurry, subjected to the dispersant addition step, is passed through the shearing force imparting device to impart shearing force to the aggregates contained in the slurry by the shearing force imparting device, thereby breaking up the aggregates; and removing foreign substances in the slurry subjected to the aggregate breakup step, by means of the foreign substances removing device.