Pulping method for treating waste paper by dry method

Abstract

The embodiment of the invention discloses a pulping method for treating waste paper by a dry method, and belongs to the technical field of waste paper pulping. The method comprises the following steps: (1) dispersing packaged commodity waste paper, and sorting impurities mixed in the waste paper by a dry method to remove non-fibrous impurities; (2) shredding the sorted waste paper, and then performing pulse dust removal; (3) enabling the dedusted shredded paper to pass through a conveyor with a magnet deironing device, and then carrying out coarse grinding to obtain coarse pulp; (4) removing heavy metals in the coarse slurry for the second time; (5) finely grinding the coarse pulp to obtain fine pulp; and (6) settling and dedusting the refined pulp, packaging and warehousing to obtain the finished pulp. According to the invention, the water consumption can be reduced, the use of a disintegrating assistant is avoided, the situation that the quality of paper pulp is reduced due to re-adhesion and re-deposition of printing ink or pigment on fibers due to long disintegrating time can be prevented, the production cost, the environmental pollution and the energy consumption are reduced, the quality of the paper pulp is improved, and the method is widely applied to pulping and papermaking industries.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of pulping waste paper, in particular to a method for pulping waste paper by dry processing. Background technique [0002] Waste paper is the main raw material for papermaking today. Papermaking from waste paper can not only alleviate the shortage of papermaking raw materials and the contradiction of energy consumption, but also conform to the concept of sustainable development, and can alleviate the increasingly serious environmental pollution problem. Compared with the direct use of commercial pulp board, the use of waste paper raw materials can effectively reduce the cost. [0003] At present, the waste paper treatment process is mainly composed of disintegration system (concentration 3-5%), screening system (1.5-2%), fiber classification screen (1.5-2%), multi-disc thickener (8-12%) and Disk heat dispersion (92-95%) system composition. Disintegration is the key first step in d...

AI Technical Summary

Problems solved by technology

This process needs to consume a large amount of water and disintegration aids to wet, penetrate and disperse the fibers, resulting in high cost and high energy consumption; and the long disintegration time will increase the re-adhesion and redeposition of ink or pigment to On the fiber, the pulp quality is not good; among them, the crushing aid is a chemical additive added to the pulping system to make the fiber produce various effects such as wetting, penetration and dispersion to assist the waste paper crushing, not only Pollution of the environment also results in high energy consumption and serious water pollution

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