Method of preparing bamboo willow bleaching pulp

Abstract

The invention discloses a method of preparing bamboo willow bleaching pulp. The method comprises the steps of cutting bamboo willow into segments, sending the segments into a digester, adding 2.5-3% potassium hydroxide and 0.2-0.3% anthraquinone, digesting the segments for 40-50 min at the temperature below 90-95 DEG C, sending digested materials into a double-screw pulp grinding machine, adding 2.2-2.5% PAM, 1-1.2% EDTA and 2.5-3% H2O2, controlling the outlet temperature at 100-105 DEG C, making the discharged materials react for 50-60 min, washing the materials, sending the materials into the double-screw pulp grinding machine again, adding 2.2-2.5% sodium tripolyphosphate, 1-1.2% magnesium sulfate and 5-5.5% H2O2, controlling the outlet temperature at 100-105 DEG C, making the discharged materials react for 50-60 min, washing the materials and obtaining the bamboo willow bleaching pulp. By the adoption of the method, the pulping yield is high, the BOD / COD ratio of sewage is high, and biodegradation is easy.

Description

technical field [0001] The invention relates to a method for preparing bamboo willow bleached pulp. Background technique [0002] Bamboo willow is a new willow hybrid variety. Because of its fast growth, high density planting, strong adaptability and excellent material, it has been introduced in a large area from the south to the north of the country. It has been 8 years since the introduction of bamboo and willow. With the increase of the planting area, the problem of the future of bamboo and willow is placed in front of the growers. It cannot be just planted and cannot be turned into a commodity! The comprehensive cellulose content of bamboo and willow is as high as 89.8%, and the pulping efficiency of papermaking is extremely high, but the investment in traditional pulping methods is too large, which is not affordable for ordinary enterprises; and the water treatment of existing pulping methods is not good. solve. Contents of the invention [0003] The technical probl...

AI Technical Summary

Problems solved by technology

It has been 8 years since the introduction of bamboo and willow. With the increase of the planting area, the problem of the future of bamboo and willow is placed in front of the growers. It cannot be just planted and cannot be turned into a commodity! The comprehensive cellulose content of bamboo and willow is as high as 89.8%, and the pulping efficiency of papermaking is extremely high, but the investment in traditional pulping methods is too large, which is not affordable for ordinary enterprises; and the water treatment of existing pulping methods is not good. solve