Oxygen delignification pulping method using bagasse as raw material, fine pulp, and use thereof

Abstract

The present application relates to an oxygen delignification pulping method using bagasse as a raw material, a fine pulp, and the use thereof, and belongs to the technical field of pulping and papermaking. The pulping method comprises the following steps: using sodium carbonate and sodium hydroxide at a mass ratio of (2-9):1 to prepare a cooking liquor having an alkali charge of 20%-30%; mixing bagasse with the cooking liquor, and then, in the presence of oxygen, performing heating and maintaining the temperature, so as to obtain a cooked slurry; washing and screening the cooked slurry to obtain a fine pulp and a black liquor; and using the black liquor to prepare a green liquor, adding sodium hydroxide into the green liquor until the alkali charge is the same as that of the cooking liquor, and reusing same as the cooking liquor. The chemical agents used in the present application are mainly sodium carbonate, supplemented by sodium hydroxide, thus reducing equipment corrosion, eliminating a causticization process, avoiding hazardous solid waste pollution caused by the causticization process, and enabling direct recycling of the green liquor. The content of silicon in the black liquor is low, thus reducing the risk of silicon interference in an alkali recovery section.

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