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High-pulp-yield deinking method

A pulp and deinking technology, applied in papermaking, waste paper processing, paper recycling, etc., can solve the problems of easy decomposition of pulp fibers, less production of stickies, environmental pollution, etc., to improve the quality of paper products, easy removal, environmental protection friendly effect

Active Publication Date: 2016-12-14
KOMPASS TECH INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main technical problems to be solved by the present invention are: low pulp yield, large amount of deinking agent and other chemicals used in the current deinking technology, easy to cause environmental pollution, easy decomposition of pulp fibers, insufficient paper strength, and high deinking cost The defect is to improve a method of deinking with a high pulp yield. In this method, the ink-containing waste paper is made into a slurry and irradiated with ultraviolet rays, and then stirred and soaked with a compound enzyme to obtain a mixed solution, and then the wheat straw powder is mixed with anthracite powder and starch. After stirring, pressing and forming, and calcining together to obtain carbonized particles, stir the carbonized particles with the above-mentioned mixed solution and fatty alcohol polyoxyethylene ether, then perform flotation treatment, filter the pulp after flotation after dilution, and finally carry out the filtrate Deinking can be completed by heating, concentrating, and diluting, and the deinked pulp can be obtained. The operation process of the present invention is simple and can effectively improve the deinking efficiency. Adding compound enzymes can reduce the decomposition and damage of pulp fibers in the deinking process, and the The finished pulp has high strength and high yield, and the carbonized particles prepared by the present invention are further deinked, and no deinking agent is used, which will not cause environmental pollution, produce less stickies, and have a wide range of application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First, weigh 2kg of waste paper containing ink, crush it, put it into a beater, add tap water with 12 times the weight of waste paper containing ink, and pulp it at 60°C and 600r / min for 40min to obtain a slurry, add water to the slurry to dilute to solid The content is 4%; the above-mentioned slurry is irradiated with ultraviolet light with a power of 1500W and a wavelength of 250nm, and after irradiating for 15 minutes, add a compound enzyme with a mass of 6% of the slurry, stir and mix for 30 minutes, then let it stand for 20 hours, and obtain a mixed solution after soaking, and set aside; the compound enzyme Cellulase, xylanase, lipase, and alkaline protease are mixed in a mass ratio of 5:3:1:1; then 100g of wheat straw is weighed, dried, crushed, and sieved through an 80-mesh sieve to obtain straw powder, which is called Take 200g of anthracite, crush it and pass through a 100-mesh sieve to obtain anthracite powder, mix the anthracite powder and straw powder, add 80...

example 2

[0021]First, weigh 4kg of waste paper containing ink, crush it, put it into a beater, add tap water with 14 times the weight of waste paper containing ink, and pulp it at 65°C and 700r / min for 50min to obtain a slurry, add water to the slurry to dilute to solid The content is 5%; the above-mentioned slurry is irradiated with ultraviolet light with a power of 1650W and a wavelength of 350nm, and after 20 minutes of irradiation, a compound enzyme with a mass of 7% of the slurry is added, stirred and mixed for 40 minutes, and then left to stand for 25 hours. After soaking, a mixed solution is obtained for use; the compound enzyme Cellulase, xylanase, lipase, and alkaline protease are mixed in a mass ratio of 5:3:1:1; then 150g of wheat straw is weighed, dried, crushed, and passed through a 90-mesh sieve to obtain straw powder, which is called Take 250g of anthracite, crush it through a 125-mesh sieve to obtain anthracite powder, mix the anthracite powder and straw powder, add 90g ...

example 3

[0024] First, weigh 5 kg of waste paper containing ink, crush it, put it into a beater, add tap water 15 times the weight of waste paper containing ink, and pulp it at 70°C and 800r / min for 60 minutes to obtain a slurry, add water to the slurry to dilute to solid The content is 6%; the above-mentioned slurry is irradiated with ultraviolet rays with a power of 1800W and a wavelength of 450nm, and after 25 minutes of irradiation, 8% of the slurry quality compound enzyme is added, stirred and mixed for 50 minutes, and then left to stand for 30 hours. After soaking, a mixed solution is obtained for use; the compound enzyme Cellulase, xylanase, lipase, and alkaline protease are mixed in a mass ratio of 5:3:1:1; then 200g of wheat straw is weighed, dried, crushed, and passed through a 100-mesh sieve to obtain straw powder, which is weighed Take 300g of anthracite, crush it through a 150-mesh sieve to obtain anthracite powder, mix the anthracite powder and straw powder, add 100g of st...

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Abstract

The invention discloses a high-pulp-yield deinking method, and belongs to the technical field of pulp deinking. Waste paper containing ink is prepared into a pulp liquid, and the pulp fluid is subjected to ultraviolet radiation and is then stirred and soaked with a complex enzyme to obtain a mixed liquid; wheat straw powder, anthracite powder, starch and the like are stirred, pressed to be formed, and calcined together to prepare carbonized particles; the carbonized particles, the mixed liquid and fatty alcohol-polyoxyethylene ether are stirred and then subjected to flotation, the obtained floated pulp is diluted and filtered, and a filtrate is finally heated, concentrated and diluted to complete deinking, so that a deinked pulp is obtained. The operation process is simple and convenient, the deinking efficiency is effectively improved, the addition of the complex enzyme reduces the degradation and loss of a pulp fiber in the deinking process, the strength of the deinked pulp is high, the yield is high, in addition, the carbonized particle is further deinked, the environment pollution is not caused because no deinking agent is used, few glue matters are produced, and the method has an extensive application prospect.

Description

technical field [0001] The invention discloses a method for deinking with high pulp yield and belongs to the technical field of pulp deinking. Background technique [0002] In recent years, due to the limitation of forest resources on the earth and the improvement of people's awareness of environmental protection, countries all over the world have attached great importance to the recycling of waste paper. Waste paper has become an important source of raw materials for the paper industry, and its proportion is increasing. Many countries regard waste paper as an important raw material for papermaking. Using waste paper for pulping and papermaking can save a lot of wood, reduce production costs, reduce waste water pollution, reduce environmental protection investment, and reduce water and energy consumption. Therefore, waste paper deinking technology is also more and more people's attention. [0003] Ink is a stable colloidal dispersion system. Its main component, that is, th...

Claims

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Application Information

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IPC IPC(8): D21C5/02D21C5/00
CPCD21C5/005D21C5/025Y02W30/64
Inventor 仇颖超徐越薛蕾
Owner KOMPASS TECH INC
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