Waste paper pulping fine screening tailing treatment technology

Abstract

The invention relates to the fields of pulping and papermaking, and concretely relates to a waste paper pulping fine screening tailing treatment technology. The technology comprises the following steps: (1) waste paper pulping fine screening tailings are fed into a transition tank 1, and then goes through a primary fine screen to obtain a primary good pulp and a primary tail pulp, and the primarygood pulp enters a residue remover; (2) the primary good pulp goes through a medium-consistency stand tube 1, and the primary tail pulp is fed into a secondary fine screen to obtain a secondary good pulp and a secondary tail pulp; (3) the secondary good pulp returns to the primary fine screen, and the secondary tail pulp is fed into an end fine screen to obtain a third good pulp and a third tail pulp; (4) the third good pulp returns to the secondary fine screen, the third tail slurry is fed into a transition tank 2, and then is sequentially processed by a fluffer, a medium-consistency stand tube 2 and a flotation tank to obtain a fourth good pulp and residues; and (5) the fourth good pulp returns to the transition tank 1 and is processed, and the residues are fed into a waste tank. The technology can reduce the residue discharge amount of the waste paper pulping fine screening section by 10-20% on the basis of ensuring the quality of the pulp.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a waste paper pulping fine screen tailings treatment process. Background technique [0002] Due to the different types of paper and cardboard produced, the process requirements of waste paper pulping are different, but in a word, the process of waste paper pulping mainly includes waste paper shredding, purification, screening, concentration, dispersion and other processes. The screening process is divided into a coarse screening section and a fine screening section. The coarse screening section only discharges a small amount of recyclable fiber, but in order to meet the process requirements of the papermaking section, the amount of recyclable fiber in the slag discharge of the fine screening section accounts for 0.8-1.5% of the processing capacity. , accounting for 1-2% of the cost of copying. As an indispensable equipment in the fine screening section of waste paper pulpi...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of large amount of slag discharge, low efficiency and waste of resources in waste paper pulping in the prior art, the present invention provides a waste paper pulping fine screen tailings treatment process, which includes the following steps:

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