Patent ID: 7419946
Filing Date: 2008-09-02
Classification: B24B,Y10T

Abstract:
1. A method for preparing slurry containing a slurry stock solution and an oxidizing agent having a predetermined target concentration, the method comprising the steps of: intentionally determining an initial mixing amount of the oxidizing agent to be supplied to a preparation tank less than the amount required for the oxidizing agent to match the predetermined target concentration of the oxidizing agent in the slurry; under control of a controller, supplying the slurry stock solution and the determined initial mixing amount of the oxidizing agent in a preparation tank to a preparation tank and mixing the slurry stock solution and the determined initial mixing amount of the oxidizing agent in the preparation tank to prepare slurry in which the concentration of the oxidizing agent is less than the predetermined target concentration; detecting the concentration of the oxidizing agent in the slurry; and then under control of the controller, additionally supplying the oxidizing agent to the preparation tank in accordance with the detected result so that the concentration of the oxidizing agent in the slurry becomes equal to the predetermined target concentration.