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Method for removing ink of waste paper

A waste paper deinking and waste paper technology, which is applied in the field of pulp and paper making, can solve the problems of less types of surfactants and environmental pollution, and achieve the effects of less residual amount, simplified process flow and high yield

Inactive Publication Date: 2015-05-20
SICHUAN MINGMING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to: aim at the problems existing in the above-mentioned traditional waste paper deinking process, provide a kind of waste paper deinking method, the surfactant type used is few, and the biodegradability of surfactant is above 90%, solves the problem of regeneration Fiber protection and its own environmental pollution

Method used

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  • Method for removing ink of waste paper

Examples

Experimental program
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Effect test

Embodiment 1

[0020] S1. Waste paper pulping and deinking: Put the waste paper into the pulper, add deinking agent and other chemical auxiliary materials in turn into the pulper, add hot water and control the pulp concentration to 15%, and the pulping temperature is 65°C, pulping time 25min. The addition amount of this deinking agent is 1.3‰ of waste paper by weight percentage; The addition amount of described chemical auxiliary material is 5% of waste paper by weight percentage, and this chemical auxiliary material includes caustic soda, water glass, hydrogen peroxide, and the weight ratio is 2 :3:1. The deinking agent is prepared according to the following steps: according to the weight percentage, the following components are weighed: fatty alcohol polyoxyethylene ether is 12%, sodium dodecylbenzenesulfonate is 43%, Tween 80 is 2%, water is 43%; then stir to mix.

[0021] S2. Deslagging and concentration: the crushed slurry is put into the slag remover for slagging, and the slag remove...

Embodiment 2

[0024] S1. Waste paper pulping and deinking: Put the waste paper into the pulper, add deinking agent and other chemical auxiliary materials in sequence in the pulper, add hot water and control the pulp concentration to 17%, and the pulping temperature is 68°C, pulping time 30min. The addition of the deinking agent is 1.5‰ of the waste paper by weight percentage; the addition of the chemical auxiliary material is 6% of the waste paper by weight percentage, and the chemical auxiliary material includes caustic soda, water glass, hydrogen peroxide, and the weight ratio is 2 :3:1. The deinking agent is prepared according to the following steps: according to the weight percentage, the following components are weighed: fatty alcohol polyoxyethylene ether is 15%, sodium dodecylbenzenesulfonate is 43%, Tween 80 is 2%, water is 40%; then stir to mix.

[0025] S2. Deslagging and concentration: the crushed slurry is put into the slag remover for slagging, and the slag removed slurry ent...

Embodiment 3

[0028] S1. Waste paper pulping and deinking: Put the waste paper into the pulper, add deinking agent and other chemical auxiliary materials in turn into the pulper, add hot water and control the pulp concentration to 18%, and the pulping temperature is 65°C, pulping time 28min. The addition of the deinking agent is 1.5‰ of the waste paper by weight percentage; the addition of the chemical auxiliary material is 6% of the waste paper by weight percentage, and the chemical auxiliary material includes caustic soda, water glass, hydrogen peroxide, and the weight ratio is 2 :3:1. The deinking agent is prepared according to the following steps: according to the percentage by weight, the following components are weighed: fatty alcohol polyoxyethylene ether is 10%, sodium dodecylbenzenesulfonate is 43%, Tween 80 is 2%, water is 45%; then stir to mix.

[0029] S2. Deslagging and concentration: the crushed slurry is put into the slag remover for slagging, and the slag removed slurry en...

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Abstract

The invention discloses a method for removing ink of waste paper, which comprises the following steps: removing ink of waste paper through repulping; removing slag and concentrating; and floating to remove ink. An ink removal agent is added in the process of removing ink through waste paper repulping, the ink removal agent is prepared through the following steps: weighing the following components according to weight percentage: 10-15% of fatty alcohol polyoxyethylene ether, 43-46% of sodium dodecyl benzene sulfonate, 2-5% of tween 80 and balance of water. In the process of floating to remove ink, a trapping agent is added, a method for preparing the trapping agent comprises the following steps: weighing the following components according to weight percentage: 20-30% of sodium stearate, 5-8% of polyoxyethylene ether phosphomonoester, and 65-70% of water. According to the method, under whiteness guarantee condition, the residual amount of ink on the recycled paper is little, and secondary fiber yield is high.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, and specifically discloses a waste paper deinking method. Background technique [0002] In order to turn the printed waste paper into white pulp that meets the production requirements, improve the use value of waste paper pulp and the grade of paper produced, it is necessary to remove ink, resin, etc. from waste paper. The whole process of ink and deinking can be roughly divided into the following three steps: loosening and separating fibers; detaching ink from fibers; removing detached ink particles from the slurry. The deinking process of waste paper is a chemical and physical process, through deinking chemicals to make the ink and fiber problems wet, expand, fall off, disperse, capture and remove. [0003] The deinking agent used in the traditional deinking method is only focused on removing ink and stickies, while ignoring the damage of the deinking agent to the regenerated f...

Claims

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Application Information

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IPC IPC(8): D21C5/02
CPCD21C5/025D21C5/027Y02W30/64
Inventor 刘立新
Owner SICHUAN MINGMING CHEM
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