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Magnetic separation and deinking method for waste paper

A waste paper and magnetic separation technology, which is applied in waste paper processing, paper making, paper recycling, etc., can solve the problems of increased difficulty in deinking and difficulty in achieving the desired effect, so as to save raw materials and energy, benefit the national economy, The effect of reducing pollution

Inactive Publication Date: 2010-06-16
有研资源环境技术研究院(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the innovation of printing technology and the increase of ink types, the difficulty of deinking has also increased. It is difficult to achieve the desired effect with traditional deinking methods.

Method used

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  • Magnetic separation and deinking method for waste paper
  • Magnetic separation and deinking method for waste paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw material of waste paper is waste copy paper, the magnetite is magnetite, and the coagulant is modified polyacrylamide, which is modified by quaternization of polyacrylamide, with a molecular weight of 5 million to 20 million. First make polyacrylamide into a dispersion solution with a certain mass fraction, heat it and keep it at a constant temperature, add the amine-aldehyde reaction solution made of formaldehyde and dimethylamine, stir, react, then cool, add bromoethane to quaternize Reagents, modified, and finally precipitated with acetone, the resulting reaction product is the coagulant used.

[0031] Add waste paper and 0.2wt% magnetite magnetic seeds into the pulper, then add water, sodium silicate and NaOH to pulp, wherein water is added to make the pulp concentration 10wt%, and the amount of sodium silicate is 10wt%, adjusted with NaOH pH to 7. After the waste paper is pulped, it is diluted with water to a pulp concentration of 4wt%, and 0.1wt% coagulan...

Embodiment 2～5

[0037] The raw material of waste paper is waste magazine paper. The operation method, equipment and product testing are the same as in Example 1, and the coagulant is the same as in Example 1. It is modified polyacrylamide. The specific experimental conditions and experimental results are listed in Table 2.

[0038] The experimental conditions of table 2, embodiment 2-5

[0039] Experimental conditions

Example 2

Example 3

Example 4

Example 5

Magnetic species

0.05wt%

magnetite

0.03wt%

magnetite

0.2wt%

Ferrosilicon

0.1wt% artificial

Ferrite Particles

Sodium silicate

2wt%

5wt%

8wt%

10wt%

The slurry was adjusted to pH with NaOH

7

9

10

8.5

After pulping, dilute with water to a pulp concentration of

0.5wt%

2.0wt%

3.5wt%

4.0wt%

Coagulant, wt% (dry paper weight)

0.01

0.025

0.05

0.1

Coagulation time of magnetic s...

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Abstract

The invention relates to a magnetic separation and deinking method for waste paper, comprising the following steps: (1) adding waste paper and magnetic seeds in a pulper, adding water, sodium silicate and NaOH for repulping, wherein the repulping conditions are as follows: the magnetic seed dosage is 0.05-0.2wt%, the dosage of sodium silicate is 2-10wt%, NaOH is used to regulate the pH value to be 7-10, and the pulp concentration is 10-15wt%; (2) adding water for diluting after water paper repulping until the pulp concentration to be 0.5-4wt%, adding flocculant which accounts for 0.01-0.1wt% of dry paper into the pulp after repulping for magnetic seed flocculation, enabling the deciduous ink particles to be adhered with magnetic seeds, wherein the pH value is 7.0-11.0, the time is 10-30min, and the stirring speed is 200-1000rpm; and (3) separating the flocculated ink particles from the pulp by a deinking device for size after magnetic seed flocculation. The method in the invention can obviously improve pulp whitness and fiber yield of water paper, and can be used for producing deinking pulp with high whiteness and high deinking rate and small amount of paper fiber loss.

Description

technical field [0001] The invention relates to a deinking method of waste paper, in particular to a magnetic separation deinking method of waste paper, which comprises magnetic separation and deinking after the ink contained in the pulp is condensed by magnetic seeds. Background technique [0002] With the development of the economy and the improvement of living standards, people's demand for paper is increasing rapidly, and the amount of waste paper is also increasing. my country discards as many as 6 million tons of waste paper every year, which makes the municipal departments that are already plagued by garbage even more overwhelmed. At present, in addition to partial recycling, the treatment methods for waste paper are mostly incineration or landfill. Incineration will cause air pollution, and landfill will occupy a large area of ​​land. [0003] Papermaking is characterized by high energy and water consumption, requires a large amount of wood, and produces a large am...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21B1/34D21D5/00
CPCY02W30/64
Inventor 郑其车小奎
Owner 有研资源环境技术研究院(北京)有限公司
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