METHOD FOR COMPREHENSIVELY UTILIZING SOLID WASTE DURING SODA RECOVERY IN PAPERMAKING INDUSTRY

摘要

Disclosed in the present invention is a method for comprehensively utilizing solid waste during soda recovery in papermaking industry. The method comprises steps: removing ferrous ion in green liquor, in which step, a basic hydroxide is added into the green liquor which is controlled to be at a temperature of above 80℃ and pH value of the green liquor is maintained to be above 14; adding hydrogen peroxide to make the green liquor contain at least 0.15 gram hydrogen peroxide per litre; stirring the green liquor for at least 2 minutes; and removing ferric precipitate in the green liquor by filtering. The method could effectively remove ferrous ion in the green liquor. Processed green liquor contains less than 1 ppm ferrous ion.