Paper pulp purification method for producing regenerated paper pulp by using waste paper

Abstract

The invention discloses a paper pulp purification method for producing regenerated paper pulp by using waste paper. The method comprises the steps of repulpling, performing high-concentration residueremoval, performing coarse screening, performing low-concentration residue removal, performing fine screening, performing low-temperature deinking purification, and performing flotation and purification, wherein deinking purification enzyme is added, so that most of printing ink, lightweight sticking substances and light plastic in the waste paper raw pulp can be separated; due to via hole shear treatment and adoption of the deinking purification enzyme in a low-temperature deinking tank, various impurities in the waste paper pulp can be completely eliminated, the deinking treatment can be conducted under the environment that the temperature is 60 to 70 DEG C instead of the high-temperature environment being 220 DEG C or higher; energy conservation and environmental friendliness are achieved; various deinking preparations are not needed, so that the problem that the deinking preparation can reduce the intensity of paper is solved, clean production is realized and no pollution in the production process is generated.

Description

technical field [0001] The invention relates to the technical field of waste paper papermaking production technology, in particular to a pulp purification method for producing recycled pulp by using waste paper. Background technique [0002] With the development of economic activities and cultural and educational undertakings, the consumption of paper is increasing day by day. If these waste papers are not recycled and regenerated, it will inevitably cause waste of resources and pollution of the environment. Therefore, recycling waste paper and reusing it is a major issue that cannot be delayed. However, according to the traditional papermaking technology, the proportion of waste paper pulp cannot exceed 20%. One of the important reasons is that waste paper pulp contains a large amount of impurities, for example, heavy impurities such as sand and other impurities such as sand and other impurities mixed in waste paper. Light impurities such as plastic sheets and water-insolu...

AI Technical Summary

Problems solved by technology

However, according to the traditional papermaking technology, the proportion of waste paper pulp cannot exceed 20%. One of the important reasons is that waste paper pulp contains a large amount of impurities, for example, heavy impurities such as sand and other impurities such as sand and other impurities mixed in waste paper. Light impurities such as plastic sheets and water-insoluble impurities such as inks and hot melt adhesives

However, the traditional pulp purification method cannot fully remove these impurities with different properties, so the improvement of the proportion of waste paper pulp is limited.