Method for improving bagasse alkaline cooking effect through wet process with CEH bleaching waste liquor

Abstract

The invention discloses a method for wet-process pile-up of bagasse in pretreatment of bagasse alkaline cooking, wherein CEH bleaching wastewater of bagasse pulp replaces clear water and is recycled in the process of the wet-process pile-up of the bagasse, and then the bagasse alkaline cooking is performed. The method comprises the following process steps: spraying bleaching washing wastewater from C, E and H three sections on bagasse piles in piled up in a stock ground until percolating water flows out of a bottom layer; after 10 to 20 piles are sprayed, discharging, conveying, washing and dehydrating the bagasse, and then conveying the bagasse into a pulp digester; and digesting the bagasse under the condition that the dosage of NaOH is between 14 and 16 percent, the dosage of anthraquinone is between 0.01 and 0.3 percent, the weight liquid ratio is 1:3-6, the digesting temperature is between 155 and 160 DEG C, the temperature is raised for 70 to 110 minutes, and the temperature is kept for 60 to 90 minutes. The method can improve the yield of the bagasse pulp by 2 to 5 percentage points, reduce organic chloride by 22 to 31 percent, and reduce the water consumption by one ton of the pulp by 8 to 15 m<3>.

Description

technical field [0001] The invention relates to the treatment of bagasse, in particular to a pulping pretreatment method which utilizes CEH bleaching waste liquid to carry out wet storage bagasse spraying to obviously improve the cooking effect of bagasse. Background technique [0002] Bagasse, as a large category of papermaking resources, is playing an increasingly important role in today's situation where paper consumption continues to increase and papermaking resources, especially wood resources, are increasingly tight. With the rapid development of the bagasse pulping and papermaking industry, the preparation of bagasse pulp after being pretreated by clear water wet storage and then using alkaline cooking, and then performing CEH three-stage bleaching to obtain bleached bagasse pulp has basically become the traditional process of finalizing the production of bagasse pulp. . Although on the basis of this traditional process, the addition of cooking aids in the alkaline c...

AI Technical Summary

Problems solved by technology

In fact, it is very difficult to significantly increase the pulp yield in the traditional pulping process, even if it is increased by 1 percentage point, and the increasingly stringent environmental protection emission requirements need to obtain pulp that is easier to bleach, and this is often done with excessive Cooking to reduce pulp residual lignin at the expense of pulp yield

As a solution to the contradiction, the pulp and paper industry has no choice but to increase investment in the advanced treatment of wastewater from the pulp and paper industry, which in turn is a waste of resources, causing the existing pulp and paper industry to be in a dilemma for industrial development