Patent ID: 6696036
Filing Date: 2004-02-24
Classification: C01B,C01P

Abstract:
A method for extracting silica of more than 99.99% purity from rice bran, comprising the steps of:(a) washing rice bran in water and removing impurities floated on the water; (b) sequentially washing the rice bran in an acid solution and water at least twice; (c) dehydrating the washed rice bran under pressure; (d) drying the dehydrated rice bran; (e) primarily burning the dried rice bran at a temperature of 350Ëœ400Â° C. while being agitated and pulverized; and (f) secondarily burning the rice bran at a temperature of 700Ëœ1000Â° C. for 10Ëœ60 minutes while being agitated by providing oxygen or air.