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Waste paper deinking method

A waste paper deinking and waste paper technology, applied in the field of papermaking, can solve the problem of low deinking effect in neutral deinking process

Active Publication Date: 2012-07-25
ZHEJIANG JINGXING PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the deinking effect of the neutral deinking process is not high, and a method for deinking waste paper is provided to solve this problem

Method used

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  • Waste paper deinking method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The concrete operation of described waste paper deinking method is as follows:

[0028] Waste paper shredding: put 4000kg of office waste paper and 1000kg of book paper into the drum pulper, add 20m 3 Water, then add 2.5kg of lipase (0.05% of the total weight of waste paper), the temperature is 50-60°C, the drum pulper runs for 15-20min, the sieve plate aperture of the pulper is 4mm, and the waste paper slurry pH The value is 7.0~8.0;

[0029] Slurry purification: The slurry that has been preliminarily disintegrated by the drum pulper is passed into the conical desander, and the impurities heavier than the fibers are removed by centrifugal force, and then the slurry with heavy impurities is pumped to the pressure screen for removal. For light impurities such as paper and nylon paper with a diameter less than 0.12mm, the feeding concentration is 4-5%, the pressure is 0.25-0.30Mpa, and the sieve drum slot width of the pressure sieve is 0.12mm;

[0030] Ink dispersion: t...

Embodiment 2-12

[0034] Carry out 11 tests repeatedly according to the method for embodiment 1, change the addition amount of lipase, other conditions are constant, each test is carried out continuously 72 hours, obtains the average value of deinking pulp into pulp whiteness and residual ink, the result is as shown in the table 1 (the embodiment number minus 1 is the test number).

[0035]

[0036] Table 1

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PUM

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Abstract

The invention belongs to the technical field of paper making and relates to a water paper deinking method, which aims to solve the problem of poor deinking effect in a neutral deinking process. The invention provides the water paper deinking method which comprises a pulping step of pulping by using a pulping machine and a flotation step of floating waste paper pulp by using a floatation groove. The water paper deinking method is characterized by further comprising a waste paper fiber rubbing step between the pulping step and the floatation step. The pulping step comprises a step of adding a deinking agent for the first time, and the floatation step comprises a step of adding the deinking agent for the second time. With the adoption of the above technical scheme disclosed by the invention, the technical problem can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of papermaking and relates to a waste paper deinking method. Background technique [0002] my country lacks forest resources, wood pulp mainly depends on imports, and waste paper accounts for more than 70% of my country's papermaking raw materials. While recycling waste paper, the problems of wastewater pollution and wastewater treatment generated in the process of waste paper pulping are becoming more and more serious. Prominent, especially deinked pulp wastewater, which is related to the nature and production process of deinked pulp. [0003] Usually, sodium hydroxide (NaOH) is generally added in the deinking process of office waste paper, and the pH value is required to be above 10. Wastewater treatment, etc. are quite unfavorable. [0004] At present, some new deinking processes have been developed under neutral conditions, but the deinking effect has a certain degree of decline compared with the deinki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02D21C5/00
CPCY02W30/64
Inventor 徐清凉
Owner ZHEJIANG JINGXING PAPER
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