Method for removing adhesive matter from regenerated pulp

A technology of recycled pulp and stickies, applied in papermaking, waste paper processing, paper recycling, etc., can solve the problems of fiber length and strength damage, high power consumption, difficult to popularize and apply, and achieve the elimination of fiber bundles and other non-fiber Effects of reducing permanent impurities, reducing equipment investment costs, and increasing pulping yield

Inactive Publication Date: 2003-02-05
李风宁
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Problems solved by technology

[0002] At present, there are several methods for removing stickies in recycled pulp: one is thermal dispersion method or cold dispersion method, that is, heat (cold) disperses all pulp containing stickies with various forms of dispersing machines, and its disadvantages are: It is high power consumption, fiber length and strength are easily damaged, and it is difficult to solve the contradiction between protecting fibers and dispersing stickies; the second is the screening method of multi-stage slotted sieve (sieve slot width ≤ 0.15mm), although this method has low power consumption, but Generally, at least two or more screenings are required, and the fiber loss rate of this method is high. The tailing pulp not only contains stickies that need to be removed, but also contains a large amount of fine pulp fibers; the third is the chemical dissolution method, that is, adding chemical to the slurry. solvent, but the cost of this method is relatively high, and it is difficult to popularize and apply

Method used

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Embodiment Construction

[0015] Method 1:

[0016] A method for removing stickies in recycled pulp:

[0017] (1) First carry out pressure slot screen screening on the recycled pulp, and use a screen with a slot width of 0.1-0.2mm to screen the pulp;

[0018] (2) Concentrate the screened tailings with a dehydration concentrator to make it concentrated to 20%-40%;

[0019] (3) Carry out hot (cold) dispersion treatment to the concentrated tailings obtained in step (2) with a hot (cold) dispersion refining (dispersing) machine.

[0020] 1%-20% talcum powder can be added to the tailings obtained after screening in step (1), and then enter the conical slag remover to remove slag, and then carry out the dehydration concentration required by step (2) and step (3) hot (cold) dispersion treatment.

[0021] Method 2:

[0022] A method for removing stickies in recycled pulp:

[0023] (1) First carry out pressure slot screen screening on the recycled pulp, and use a screen with a slot width of 0.1-0.2mm to sc...

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Abstract

The method for removing adhesive material from regenerated pulp includes the following steps: firstly, using pressure slotted screen to screen the regenerated pulp, concentrating the screened tail pulp by using dewatering thickener to make it concentrate to a certain concentration, then using heat (cold) dispersing-pulp-grinding (dispersing) machine to make heat (cold) dispersing treatment. Said invention possesses good effect for removing adhesive material, and is high in pulp material recovery and is low in electric power consumption, so that it can be extensively used in the field of treating regenerated pulp containing adhesive material.

Description

technical field [0001] The invention relates to a method for removing stickies in papermaking pulp, in particular to a method for removing stickies in recycled pulp. Background technique [0002] At present, there are several methods for removing stickies in recycled pulp: one is thermal dispersion method or cold dispersion method, that is, heat (cold) disperses all pulp containing stickies with various forms of dispersing machines, and its disadvantages are: It is high power consumption, fiber length and strength are easily damaged, and it is difficult to solve the contradiction between protecting fibers and dispersing stickies; the second is the screening method of multi-stage slotted sieve (sieve slot width ≤ 0.15mm), although this method has low power consumption, but Generally, at least two or more screenings are required, and the fiber loss rate of this method is high. The tailing pulp not only contains stickies that need to be removed, but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 李风宁
Owner 李风宁
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