Waste paper deinking method

A waste paper deinking and waste paper technology, which is applied in the field of papermaking, can solve the problems of bio-enzyme-refractory inks and high ink residues, and achieve the effects of increasing surface area, improving efficiency, and reducing crystallinity

Inactive Publication Date: 2018-12-11
HEFEI LONGFA PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of biological enzyme deinking is mainly used for deinking of waste paper, but because the ink ions in the waste paper pulp are easily squeezed into the fiber under high-speed mechanical action, it is difficult for biological enzymes to degrade this part of the ink, thus Resulting in higher ink residues in the treated pulp

Method used

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  • Waste paper deinking method

Examples

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Effect test

Embodiment 1

[0023] A method for deinking waste paper, the specific steps are as follows:

[0024] 1) Collect waste paper and crush it, pour it into a clear water pool, add 0.5mol / L dilute sulfuric acid solution, adjust the pH to 5.0, and soak for 50 minutes;

[0025] 2) Take out the soaked material and centrifuge to remove impurities in the material and make pulp;

[0026] 3) Move the pulp to the container, add material treatment agent, stir evenly, and then carry out ultrasonic water bath oscillation dispersion in a magnetic field with a magnetic induction intensity of 3500GS. The water bath temperature is 70°C, the oscillation power is 600W, and the oscillation time is 25min;

[0027] 4) Dilute the treated pulp with water and move it to a flotation tank, add a deinking agent, and perform flotation deinking under 500W ultrasonic waves;

[0028] 5) After the deinked waste paper pulp is washed by a high-speed pulp washer, it can be made into qualified pulp.

[0029] Preferably, in step 1...

Embodiment 2

[0039] A method for deinking waste paper, the specific steps are as follows:

[0040] 1) Collect waste paper and crush it, pour it into a clear water pool, add 0.7mol / L dilute sulfuric acid solution, adjust the pH to 5.5, and soak for 70 minutes;

[0041] 2) Take out the soaked material and centrifuge to remove impurities in the material and make pulp;

[0042] 3) Move the pulp to the container, add material treatment agent, stir evenly, and then carry out ultrasonic water bath oscillation dispersion in a magnetic field with a magnetic induction intensity of 4500GS. The temperature of the water bath is 75°C, the oscillation power is 600W, and the oscillation time is 30min;

[0043] 4) Dilute the treated pulp with water and move it to a flotation tank, add a deinking agent, and perform flotation deinking under 550W ultrasonic waves;

[0044] 5) After the deinked waste paper pulp is washed by a high-speed pulp washer, it can be made into qualified pulp.

[0045] Preferably, in...

Embodiment 3

[0055] A method for deinking waste paper, the specific steps are as follows:

[0056] 1) Collect waste paper and crush it, pour it into a clear water pool, add 1mol / L dilute sulfuric acid solution, adjust the pH to 6.0, and soak for 80 minutes;

[0057] 2) Take out the soaked material and centrifuge to remove impurities in the material and make pulp;

[0058] 3) Move the pulp to the container, add material treatment agent, stir evenly, and then carry out ultrasonic water bath oscillation dispersion in a magnetic field with a magnetic induction intensity of 5500GS. The water bath temperature is 80°C, the oscillation power is 700W, and the oscillation time is 35min;

[0059] 4) Dilute the treated pulp with water and move it to a flotation tank, add a deinking agent, and perform flotation deinking under 600W ultrasonic waves;

[0060] 5) After the deinked waste paper pulp is washed by a high-speed pulp washer, it can be made into qualified pulp.

[0061] Preferably, in step 1),...

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Abstract

The invention discloses a waste paper deinking method. The method comprises the following specific steps: 1) smashing waste paper, and transferring the smashed waste paper into an acid solution for soaking; 2) taking the soaked material out, and centrifuging to obtain paper pulp; 3) transferring the paper pulp into a container, and adding a material treatment agent and performing ultrasonic oscillation treatment; 4) adding water into the treated paper pulp for diluting, and performing flotation deinking; 5) washing the deinked paper pulp with a high-speed pulp washer. By adopting the waste paper deinking method provided by the invention, the paper pulp is treated with the material treatment agent to damage a part of hydrogen bonds among cellulose molecules, so that the cellulose structurebecomes loose and expands, degradation of ink permeating into cellulose through a deinking agent is facilitated, and the deinking efficiency is improved. Thus, the paper pulp yield is improved.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for deinking waste paper. Background technique [0002] Paper products are essential items in people's daily life and are in great demand. Generally, paper products are made of wood, and a large number of paper products lead to a large number of deforestation, resulting in serious pollution of the ecological environment. In order to protect the environment, it is a very environmentally friendly method to reuse waste paper after deinking treatment. At present, the method of biological enzyme deinking is mainly used for deinking of waste paper, but because the ink ions in waste paper pulp are easily squeezed into the fiber under high-speed mechanical action, it is difficult for biological enzymes to degrade this part of the ink, thus This results in higher ink residues in the treated pulp. Therefore, how to improve the degradation rate of biological enzy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCD21C5/02D21C5/025D21C5/027Y02W30/64
Inventor 林悦敏
Owner HEFEI LONGFA PACKING CO LTD
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