METHOD OF PREPARATION FOR SILICA (SIO2) FROM RICE BRAN

摘要

A method for extracting silica of more than 99.99 % purity from rice bran includes the steps of: washing rice bran in water and removing impurities floated on the water; sequentially washing the rice bran in an acid solution and water more than twice; dehydrating the washed rice bran under pressure; drying the dehydrated rice bran; burning the dried rice bran at a temperature of 350 &tilde& 400 DEG C while being agitated and pulverized; and burning the rice bran at a temperature of 700 &tilde& 1000 DEG C for 10 &tilde& 60 minutes while being agitated by providing oxygen or air. The soot, a by-product detrimental to the environment, generated during burning the rice bran in the process of extracting silica, can be effectively removed.