Method for removing adhesive substances from fine screenings in a waste paper pulping process

Abstract

The application discloses a method for removing adhesive substances in refined screen residue in a waste paper pulping process and belongs to the technical field of pulping and papermaking. In view of the problems of high adhesive substance content in refined screen residue and difficult recovery of fibers in the prior art, the application adopts the process parameters of pulp consistency of 0.8-1.2%, rotor gap of 0.1-0.3 mm and rotating speed of 8000-10000 r / min under normal temperature conditions through high-frequency disintegration, so that the adhesive substances are efficiently stripped from the surface of the fibers, and then the separation of the adhesive substances and the fibers is realized through a gas floatation tank. The removal rate of the adhesive substances after treatment is greater than 85%, and more than 80% of the refined screen residue can be directly used in a pulping line. The application has the advantages of simple operation, low energy consumption, significant economic benefits and environmental benefits.