Method for improving removal effect of ink in waste paper pulp

A waste paper pulp and ink technology, which is applied in the field of ink removal in waste paper pulp, to improve the ink removal effect in waste paper pulp, and can solve the problems of large-scale recycling and reuse of waste paper, unsuitability for industrialized large-scale production methods, and difficulty in improving economic benefits, etc. problems, to achieve the effect of improving deinking effect, reducing the loss of good pulp components, and enhancing flotation selectivity

Inactive Publication Date: 2010-06-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing waste paper treatment technology can realize the recycling of ONP, OMG, OCC and other types of waste paper at the same level. From a technical point of view, these types of waste paper have basically reached the limit of recycling, but The high fiber loss during recycling treatment and the difficulty in improving economic benefits have always been the main problems that plague the rapid development of waste paper recycling
In addition, for high-grade waste paper including MOW, although its fiber quality is excellent, due to the special printing method and ink composition, the ink particle size after shredding is too large, and it is difficult to peel off the fiber surface, so it has to be downgraded and reused. , which is also the main reason for the large-scale recycling and reuse of this kind of waste paper
In response to the above problems, researchers at home and abroad have proposed many new deinking methods, such as: enzymatic deinking, magnetic deinking, ultrasonic deinking, etc., trying to solve or improve the removal of ink and the improvement of deinking efficiency. After research, it is found that these methods are not suitable or temporarily not suitable for large-scale industrial production. In comparison, the traditional flotation method has always been used in the industrial application of waste paper deinking due to its advantages of simple process, continuous operation and large production capacity. Take advantage of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 160g (absolute dry weight) of MOW waste paper, and disintegrate it for 25 minutes under the conditions of 15% pulp concentration and 65±2°C temperature. Polyether non-ionic deinking agent, and 0.075% (relative to pulp absolute dry weight) anionic sodium polyacrylate, the average molecular weight is 2100, after stirring evenly, float at 43±2°C for 5 minutes. Take the pulp before and after flotation, according to 170g / m 2 Quantitatively make hand-sheets, squeeze them under 350kPa pressure for 3 minutes, then transfer them to drying sheets, place them on a drying ring, and dry them in a constant temperature and humidity room. . All the above are percentages by mass.

[0020] Result: Whiteness 89.17% ISO, ERIC value 39.97×10 -6 , The amount of flotation ink residue is 5.22%, and the flotation deinking efficiency is 87.77% calculated according to the ERIC value of the paddle before and after flotation. Compared with the result of flotation with only the same amount ...

Embodiment 2

[0023] Take 160g (absolute dry weight) of MOW waste paper and disintegrate it for 25 minutes under the conditions of 15% pulp concentration and 65±2°C temperature. Alkylphenol polyoxyethylene ether non-ionic deinking agent, and 0.005% (relative to pulp absolute dry mass) anionic polyacrylamide, with an average molecular weight of 5000, after stirring evenly, float at 43±2°C Choose 5 minutes. Take the pulp before and after flotation, according to 170g / m 2 Quantitatively make hand-sheets, squeeze them under 350kPa pressure for 3 minutes, then transfer them to drying sheets, place them on a drying ring, and dry them in a constant temperature and humidity room. . All the above are percentages by mass.

[0024] Result: Whiteness 87.65% ISO, ERIC value 54.20×10 -6 , the amount of flotation ink residue is 4.64%, and the flotation deinking efficiency is 83.53%. Compared with the result of flotation with only the same amount of polyether non-ionic deinking agent added, the whitene...

Embodiment 3

[0027] Get 160g (absolute dry weight) of old newsprint, add 1% sodium silicate (relative to the absolute dry mass of pulp), 1% sodium hydroxide (relative to the absolute dry mass of pulp), 1.5% hydrogen peroxide (relative to the absolute dry mass of pulp), quality), under the conditions of 10% pulp concentration and 60±2°C temperature for 20 minutes, after crushing, the pulp is diluted to 1% pulp concentration, and 0.3% (relative to the absolute dry mass of pulp) ether non-ionic deinking is added agent, and 0.1% (relative to the absolute dry mass of pulp) of sodium polymethacrylate, the average molecular weight is 8000, after stirring evenly, float at 43±2°C for 5 minutes. Take the pulp before and after flotation, according to 170g / m 2 Quantitatively make hand-sheets, squeeze them under 350kPa pressure for 3 minutes, then transfer them to drying sheets, place them on a drying ring, and dry them in a constant temperature and humidity room. . All the above are percentages by m...

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PUM

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Abstract

The invention discloses a method for improving a removal effect of ink in waste paper pulp. The method comprises the steps of: breaking waste paper, and diluting obtained pulp; then relative to the absolute dry mass of the paper pulp, adding 0.0025 to 0.5 percent of nonionic deinking agent into the pulp; at the same time, adding an anionic dispersant with a dispersion effect, wherein the consumption of the anionic dispersant is 0.001 to 0.3 percent of the absolute dry mass of the paper pulp; and floating at the temperature of between 40 and 50 DEG C after the mixture is stirred uniformly to remove the ink in the waste paper pulp, wherein the anionic dispersant is anionic polyacrylamide, or is one of polyacrylate and polymethacrylate. The method adopts the cheaper dispersant to compound the deinking agent with higher cost for floatation, which promotes deinking effect, and also solves the problems of cost increase caused by overhigh consumption of the deinking agent and the decrease of economic benefit caused by excessive fiber loss.

Description

technical field [0001] The invention relates to ink removal in waste paper pulp, in particular to a method for improving ink removal effect in waste paper pulp. It belongs to the technical field of secondary fiber recycling. Background technique [0002] The paper industry is an important industry that is closely related to the development of the national economy and the construction of social civilization. In economically developed countries, the growth rate of paper and cardboard consumption is synchronized with the growth rate of GDP. The role played by the paper industry in the modern economy has attracted more and more attention from the world. However, in recent years, due to the influence of resources, environment, and benefits, especially the shortage of raw materials, energy crisis, and environmental pollution, the world's paper industry has gradually moved towards high efficiency, high quality, high benefit, low consumption, and low consumption. The development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21H21/08
CPCY02W30/64
Inventor 李擘朱俊勇陈克复王高升
Owner SOUTH CHINA UNIV OF TECH
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