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Deinking process for waste paper

A waste paper deinking and waste paper technology, applied in pulp bleaching, textile and papermaking, and pulp fat/resin/asphalt/wax removal, etc., can solve the problems of low ash and yield, high investment and high production cost, Achieve the effect of increasing ash and fiber yield, reducing pollution and reducing production costs

Inactive Publication Date: 2010-11-03
MCC PAPER YINHE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latter method is mainly due to the instability of the whiteness of the pulp obtained, and also the problem that the ash content and yield are low, and the amount of commercial calcium carbonate filler that needs to be added when it is used for papermaking is relatively large.
[0003] At the same time, with the development of the paper industry, the environmental pollution of the alkali recycling lime mud in the paper industry has gradually attracted people's attention. The main components of the lime mud are light calcium carbonate and a small amount of caustic soda and sodium silicate. Developed the technology of alkali recovery lime mud to produce refined calcium carbonate filler, but due to high investment, high production cost, and inability to 100% replace commercial calcium carbonate, it has brought certain difficulties to the promotion of this technology for enterprises. In fact, a large amount of alkali recovery white mud Mud is landfilled as industrial waste and affects the environment

Method used

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  • Deinking process for waste paper
  • Deinking process for waste paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Carry out waste paper deinking through the following steps in sequence, and the deinking effect is shown in Table 1:

[0034] (1), add 7000ml of 80 ℃ hot water in the hydropulper;

[0035] (2), sequentially add concentration is 30%, specific gravity is 33.3ml of liquid caustic soda of 1.35 ± 2g / l; Baume degree ≥ ° Be`38, modulus is 16.5ml of liquid sodium silicate of 3.0~4.5; Concentration is 50%, ISO whiteness 80%, effective alkali content 0.5%, hydrochloric acid insoluble matter content 5% alkali recovery lime mud 80g and Greenfell liquid cultural paper deinking agent 2.5g;

[0036] (3), drop into 37# American waste in the hydraulic pulper -- a kind of waste cultural paper 1000g that is specially used for deinking and bleaching, disintegrate 10min;

[0037] (4), then add 36.36ml of hydrogen peroxide with a concentration of 27.5%, and then disintegrate for 25 minutes;

[0038] Flotation deinking is then performed using a conventional flotation deinking system. Final...

Embodiment 2

[0042] Carry out waste paper deinking through the following steps in turn, and the deinking effect is shown in Table 2:

[0043] (1), add 7000ml of 80 ℃ hot water in the hydropulper;

[0044] (2), successively adding concentration is 30%, specific gravity is 33.3ml of liquid caustic soda of 1.35 ± 2g / l; Baume degree ≥ ° Be`38, modulus is 16.65ml of liquid sodium silicate of 3.0~4.5; Concentration is 50%, ISO whiteness 80 degrees, effective alkali content 0.5%, hydrochloric acid insoluble matter content 5% alkali recovery lime mud 60g and Greenfell liquid cultural paper deinking agent 2.5g;

[0045] (3), drop into 37# American waste in the hydraulic pulper -- a kind of waste cultural paper 1000g that is specially used for deinking and bleaching, disintegrate 10min;

[0046] (4), then add 36.36ml of hydrogen peroxide with a concentration of 27.5%, and then disintegrate for 25 minutes;

[0047] Flotation deinking is then performed using a conventional flotation deinking system....

Embodiment 3

[0051] The waste paper is deinked through the following steps in sequence, and the deinking effect is shown in Table 3:

[0052] (1), add 8000ml of 80 ℃ hot water in the hydropulper;

[0053] (2), successively adding concentration is 30%, specific gravity is 33.3ml of liquid caustic soda of 1.35 ± 2g / l; Baume degree ≥ ° Be`38, modulus is 16.65ml of liquid sodium silicate of 3.0~4.5; Concentration is 50%, ISO whiteness 90 degrees, effective alkali content 0.1%, hydrochloric acid insoluble matter content 1% alkali recovery lime mud 80g and Greenfell liquid newsprint paper paper deinking agent 2.5g;

[0054] (3), drop into 8# American waste in the hydropulper -- a kind of waste newspaper 1000g that is specially used in deinking and bleaching, disintegrate 10min;

[0055] (4), then add 36.36ml of hydrogen peroxide with a concentration of 27.5%, and then disintegrate for 25 minutes;

[0056] Flotation deinking is then performed using a conventional flotation deinking system. Fin...

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Abstract

The invention belongs to the field of a papermaking technology and in particular relates to a method for deinking waste paper through the addition of alkali recovered white mud. The method comprises the following steps: firstly, water, the alkali recovered white mud, sodium hydrate, sodium silicate, a deinking agent and the waste paper are sequentially added, mixed and crushed for a period of time; secondly, the mixture is added with hydrogen peroxide and is crushed for a period of time; and finally, the mixture is subjected to floatation deinking through the prior floatation deinking system.The method adds the alkali recovered white mud in the process of crushing the waste paper, reduces the use amount of the hydrogen peroxide, the sodium hydrate and the sodium silicate in the deinking process, improves the ash content and fiber yield of pulp and reduces production cost and pollution of the alkali recovered white mud as industrial garbage for landfill.

Description

Technical field: [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for deinking waste paper by adding alkali to recover lime mud. Background technique: [0002] In the paper industry, the commonly used waste paper deinking method is the chemical deinking method. The chemical deinking method generally uses hydrogen peroxide, caustic soda, sodium silicate and deinking agent for deinking. This method uses a relatively large amount of chemicals and is very expensive. Adhesives adulterated in refractory waste paper. One of the existing deinking methods is to disintegrate waste paper with caustic soda, sodium silicate, deinking agent, and hydrogen peroxide and then perform flotation deinking; the other is to deink waste paper together with deinking agent and foaming agent. Bleaching is carried out after crushing and flotation. The amount of hydrogen peroxide, caustic soda and sodium silicate in the former method is relative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21B1/34D21C3/02D21C9/08D21C9/16C12S3/02
Inventor 刘守辉王秋云苗金祥闫成珉
Owner MCC PAPER YINHE