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Retention method capable of improving paper making by using waste paper deinking pulp

A technology for deinking pulp and deinking pulp of waste paper is applied in the field of papermaking industry, which can solve the problems of low retention rate, high cost and high chemical consumption, and achieve the effect of improving retention rate and dewatering effect and reducing papermaking cost.

Inactive Publication Date: 2010-06-30
WUHAN CHENMING HANYANG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional retention technology cannot meet the retention rate requirements of deinked pulp, resulting in low retention rate, high chemical consumption and high cost in the papermaking technology using deinked pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0008] After adding 0.4% concentrated sulfuric acid relative to the amount of waste paper deinking pulp in the deinking pulp tank, the measured turbidity is 1485NTU, followed by adding 0.05% fixative to the mixed pulp tank, and then adding 5% wet grinding carbonic acid Calcium, 5% light calcium carbonate, 0.8% cationic starch and 0.1% AKD are mixed evenly, and then the uniformly mixed deinking pulp is sent to the flow system before the screen, and 0.03% cationic polypropylene is added before the pressure screen Add 0.2% bentonite and 0.015% anion retention particles after amide and pressure sieving, and finally make it into shape on a paper machine.

[0009] Retention rate detection: 62%

example 2

[0011] After adding 0.7% concentrated sulfuric acid relative to the amount of waste paper deinking pulp in the deinking pulp tank, the measured turbidity is 1050NTU, followed by adding 0.1% fixative to the mixed pulp tank, and then adding 5% wet grinding calcium carbonate , 5% light calcium carbonate, 0.8% cationic starch and 0.1% AKD are mixed evenly, and then the uniformly mixed deinked pulp is sent to the flow system before the screen, and 0.035% cationic polyacrylamide, pressure After sieving, add 0.25% bentonite and 0.02% anion retention particles, and finally make it into shape on a paper machine.

[0012] Retention rate detection: 75%

example 3

[0014] After adding 0.4% concentrated sulfuric acid relative to the amount of waste paper deinking pulp in the deinking pulp tank, the measured turbidity is 1485NTU, followed by adding 0.1% fixative to the mixed pulp tank, and then adding 5% wet grinding calcium carbonate , 5% light calcium carbonate, 0.8% cationic starch and 0.1% AKD are mixed evenly, and then the uniformly mixed deinked pulp is sent to the flow system before the screen, and 0.035% cationic polyacrylamide, pressure After sieving, add 0.25% bentonite and 0.02% anion retention particles, and finally make it into shape on a paper machine.

[0015] Retention rate detection: 73%

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Abstract

The invention relates to a retention method capable of improving the paper making by using waste paper deinking pulp, comprising the following steps: adding concentrated sulfuric acid which is 0.4-0.7 percent by weight of the waste paper deinking pulp in an incoming waste paper deinking pulp pond, and adding the turbidity of the incoming waste paper deinking pulp bellow 1500NTU; adding fixing agent which is 0.05-0.15 percent by weight of the waste paper deinking pulp in a waste paper deinking pulp mixing system; conveying the evenly mixed material to a flow delivery system in the front of the net of a paper making machine; adding cationic polyacrylamide which is 0.03-0.05 percent by weight of the waste paper deinking pulp in the front of a pressure screen, and highly shearing the large floccules into small floccules by the pressure screen; adding bentonite which is 0.2-0.4 percent by weight of the waste paper deinking pulp; adding anionic organic particles which are 0.01-0.03 percent by weight of the waste paper deinking pulp; and making the waste paper deinking pulp into paper by the paper making machine. The retention method can obviously improve the retention rate and the dehydration effect of the net of the paper making machine and reduces the paper making cost.

Description

technical field [0001] The invention relates to a technology for improving the retention effect of the wet part of a paper machine when a large amount of waste paper deinking pulp is used in a papermaking process, and belongs to the field of papermaking industry. Background technique [0002] Using waste paper deinking pulp to make paper, due to the use characteristics of waste paper as recycled fibers, the content of anion garbage in the pulp is high, and the retention effect is poor. At present, most enterprises in the waste paper deinking pulp retention process still use the traditional particulate retention and drainage system, which is composed of cationic polymers and anions. The fine components are first combined with cationic polymers to form large particles. For flocculation, the addition of cationic high polymer is generally 0.01-0.1%, and then, the large flocs are broken up by high shear. Finally, add anionic microparticles at a rate of 0.05-0.8%, and the broken ...

Claims

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Application Information

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IPC IPC(8): D21H23/04
Inventor 谭道诚耿增伦柯友国胡雪
Owner WUHAN CHENMING HANYANG PAPER
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