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Production method of high-whiteness waste paper deinking and bleaching paper pulp

A technology for deinking and producing waste paper, applied in the field of papermaking, can solve the problems of high cost of wood pulp, unable to achieve the purpose of reducing costs and green production, unable to produce high whiteness waste paper deinking and bleaching pulp, etc. The effect of material quality

Inactive Publication Date: 2020-03-24
NINE DRAGONS PAPER IND TIANJIN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for producing high-whiteness waste paper deinked bleached pulp, which solves the problem that the existing chemically bleached commercial wood pulp has a high cost and cannot use waste paper as a raw material for pulp preparation to produce high-whiteness pulp. Deinking and bleaching pulp of waste paper can not achieve the purpose of cost reduction and green production

Method used

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  • Production method of high-whiteness waste paper deinking and bleaching paper pulp
  • Production method of high-whiteness waste paper deinking and bleaching paper pulp
  • Production method of high-whiteness waste paper deinking and bleaching paper pulp

Examples

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Effect test

Embodiment 1

[0034] S1, first disintegrating the waste paper through a pulper, the pulper disintegrates the waste paper, and the pulping cutter head in the pulper fully disintegrates the waste paper fibers at a speed of 250r / min, thereby obtaining pulp;

[0035] S2, and then use the high-consistency slag remover to perform the first-stage purification. The high-concentration slag remover adopts a centrifugal rotation speed of 800r / min, and the heavy impurities with large density and large volume in the pulp are thrown to the wall of the device, under the action of gravity down, slide down the bottom of the device, and enter the sediment tank to complete the first-level purification of the high-concentration slag remover;

[0036] S3. Then carry out secondary purification through the low-consistency cleaner. The low-concentration cleaner uses a centrifugal speed of 450r / min to separate the heavy impurities with high density and small volume in the pulp to complete the removal of the low-conc...

Embodiment 2

[0044] S1, first disintegrate the waste paper through a pulper, and the pulper disintegrates the waste paper, and the pulping cutter head in the pulper fully disintegrates the waste paper fibers at a speed of 200r / min, thereby obtaining pulp;

[0045] S2. Then use the high-consistency slag remover to perform the first-stage purification. The high-concentration slag remover adopts a centrifugal rotation speed of 700r / min, and the heavy impurities with large density and large volume in the pulp are thrown to the wall of the device, under the action of gravity down, slide down the bottom of the device, and enter the sediment tank to complete the first-level purification of the high-concentration slag remover;

[0046] S3. Then carry out secondary purification through the low-concentration cleaner. The low-concentration cleaner adopts a centrifugal speed of 400r / min to separate the heavy impurities with high density and small volume in the pulp to complete the removal of the low-co...

Embodiment 3

[0054] S1, first disintegrate the waste paper through a pulper, and the pulper disintegrates the waste paper, and the pulping cutter head in the pulper fully disintegrates the waste paper fibers at a speed of 300r / min, thereby obtaining pulp;

[0055] S2, and then use the high-consistency slag remover to perform the first-stage purification. The high-concentration slag remover adopts a centrifugal rotation speed of 900r / min, and the heavy impurities with large density and large volume in the pulp are thrown to the wall of the device, under the action of gravity down, slide down the bottom of the device, and enter the sediment tank to complete the first-level purification of the high-concentration slag remover;

[0056] S3. Then carry out secondary purification through the low-consistency cleaner. The low-concentration cleaner uses a centrifugal speed of 500r / min to separate the heavy impurities with high density and small volume in the pulp to complete the removal of the low-co...

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Abstract

The invention discloses a production method of high-whiteness waste paper deinking and bleaching paper pulp. The method specifically comprises the following steps: S1, repulping waste paper by a repulper; S2, carrying out first-stage purification by utilizing a high-concentration residue remover; S3, carrying out second-stage purification through a low-concentration residue remover; S4, filteringimpurities through a pressure sieve; S5, separating the impurities through a flotation deinking tank; S6, removing water through a multi-disc thickener; S7, removing the impurities through a heat dispersion machine; S8, carrying out high-concentration oxidation bleaching by using hydrogen peroxide as a chemical; and S9, carrying out reductive bleaching with a pollution-free reductive substance. The invention relates to the technical field of papermaking. According to the production method of the high-whiteness waste paper deinking and bleaching paper pulp, waste of water and chemicals can be avoided, and products of oxidation and reduction reactions are free of pollution to the environment, so that the whiteness of the paper pulp is greatly improved, the commercial bleaching wood pulp is replaced, and the production cost is well reduced.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for producing high-whiteness waste paper deinked bleached pulp. Background technique [0002] Waste paper generally refers to recyclable renewable resources that are discarded after being used in production and life, including various high-grade paper, yellow board paper, waste cartons, edge-cut paper, packing paper, paper for enterprises and units, engineering paper and books and periodicals. Newspapers, internationally, waste paper is generally divided into three types: European waste, American waste and Japanese waste. In China, the degree of recycling of waste paper is relatively low compared with western developed countries. The raw materials of paper are mainly wood, grass, Reed, bamboo and other plant fibers, waste paper is also called "secondary fiber". The main purpose is to reuse fiber to produce recycled paper products. The value of paper resources. In ad...

Claims

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Application Information

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IPC IPC(8): D21C5/02
CPCD21C5/02D21C5/022D21C5/025Y02W30/64
Inventor 董立辰
Owner NINE DRAGONS PAPER IND TIANJIN
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