Waste paper deinking and magnesium base hydrogen peroxide bleaching method

A base hydrogen peroxide, waste paper deinking technology, applied in pulp bleaching, pulp beating method, processing waste paper and other directions, can solve the problems of poor deinking effect of waste paper, high initial alkalinity, difficulty in deinking, etc. Achieve the effect of reducing ink residual concentration, good whiteness stability and enhancing flotation efficiency

Active Publication Date: 2020-07-17
GUANGDONG IND TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing waste paper deinking and bleaching treatment process mainly has the following defects: (1) due to the advent of new technologies such as pressureless printing and electrostatic printing, the types of inks are also increasing day by day, for example, UV solid inks, laser printing inks, aniline inks, etc. Printing ink, etc. These inks are the main reason for the difficulty of deinking, resulting in poor deinking effect of waste paper, especially for waste paper with high lignin content. degree of decline
Because the strong alkalinity of sodium hydroxi

Method used

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  • Waste paper deinking and magnesium base hydrogen peroxide bleaching method
  • Waste paper deinking and magnesium base hydrogen peroxide bleaching method
  • Waste paper deinking and magnesium base hydrogen peroxide bleaching method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1 waste paper deinking and magnesium base hydrogen peroxide bleaching method

[0031] figure 1 It is a schematic process flow diagram of the waste paper deinking and magnesium base hydrogen peroxide bleaching method of the present invention. Such as figure 1 As shown, it specifically includes the following steps:

[0032] 1. Preparation of waste paper pulp raw materials: take 200g of old newspapers, cut them into 30mm×30mm pieces of paper, put them in a vat, pour 5L of distilled water and soak them for 24 hours, then stop soaking, and then use a centrifuge to dehydrate until the water content is 32%. , after dehydration, put the absolutely dry waste paper raw materials into a sealed bag for later use;

[0033] 2. Pretreatment of surfactant: Weigh 100g of absolute dry waste paper raw material, add 2L of 40°C water to dilute the waste paper raw material to a concentration of 50g / L, turn on the mixer for stirring; when the stirring starts, add a mass of 0.12 ...

Embodiment 2

[0039] The difference from Example 1 is that the mass of the acrylic acid monomer added in step 2 is 0.1 g, and the mass of the isophorone diisocyanate added is 0.1 g.

Embodiment 3

[0041] The difference from Example 1 is that the mass of the acrylic acid monomer added in step 2 is 0.14 g, and the mass of the isophorone diisocyanate added is 0.08 g.

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PUM

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Abstract

The invention belongs to the technical field of waste paper pulping and papermaking, and discloses a waste paper deinking and magnesium base hydrogen peroxide bleaching method. The method comprises the steps of waste paper pulp raw material preparation, surfactant pretreatment, pulping, ultrasonic flotation, washing deinking, hydrogen peroxide bleaching, paper making and the like. Through innovation and improvement of a deinking process, pretreatment of a surfactant is performed before pulping operation, and through the synergistic effect of the surfactant acrylic acid and isophorone diisocyanate, the subsequent waste paper deinking effect can be effectively enhanced, and the paper strength is enhanced. A hydrogen peroxide bleaching process is improved, laccase is used as a pre-bleaching agent, and magnesium sulfate, sodium silicate and sodium hydroxide are used as bleaching protective agents; hydrogen peroxide is used as a bleaching agent, and sodium isononanoyloxybenzenesulfonate isused as a bleaching aid, so the bleached waste paper deinking pulp is good in strength, high in whiteness and good in whiteness stability, and the COD value in bleaching waste liquid is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking of waste paper, and in particular relates to a method for deinking waste paper and bleaching with magnesium base hydrogen peroxide. Background technique [0002] The shortage of plant fiber raw materials for papermaking and environmental pollution have always been the main obstacles restricting the sustainable and healthy development of my country's pulp and paper industry. In recent years, waste paper pulping and papermaking technology has gradually attracted attention due to its advantages such as low raw material cost and environmental pollution load, and has developed rapidly. The recycling of waste paper is an effective way to solve the shortage of resources, energy waste and serious pollution faced by the paper industry. The recycled pulp after waste paper is shredded, because the whiteness of the paper is reduced in the process of shredding and deinking, so the bleaching te...

Claims

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Application Information

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IPC IPC(8): D21C9/16D21C9/02D21C5/02D21D1/02
CPCD21C9/163D21C9/02D21C5/025D21C5/027D21D1/02Y02W30/64
Inventor 云娜张舒心卞喻蔡永辉
Owner GUANGDONG IND TECHN COLLEGE
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