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Clean wastepaper deinking production method

A waste paper deinking and clean production technology, applied in the field of papermaking, can solve the problems of high chemical consumption and pollution, and achieve the effects of high biological activity, reduced material consumption, and mild conditions

Active Publication Date: 2013-05-08
ANHUI LEVEKING BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a waste paper deinking method for clean production, overcome the defects of large chemical consumption and serious pollution in the prior art chemical waste paper deinking method, and provide an alkaline lipase that can be used in the paper industry application on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: 8# U.S. waste newsprint (8# U.S. waste) deinking

[0022] (1) Pulping: Add 8# American waste newsprint into the pulper, add 0.02% alkaline lipase, 0.1% sodium hydroxide, 0.01% surfactant (cocoic acid monoethanolamide sulfo The mass ratio of disodium succinate monoester to fatty acid potassium soap is 1:1), the pulping concentration is controlled to 15%, the disintegration is 20min, and the temperature is 55°C.

[0023] (2) Flotation: Flotation is carried out in a flotation tank. Dilute the disintegrated slurry to a slurry concentration of 1%, control the ventilation rate at 25-35L / h, and the pressure at 0.3-1M Pa. Flotation at room temperature for 15 minutes.

[0024] (3) Washing: After flotation, the pulp is diluted with water to a concentration of 0.2%, and washed through a 120-mesh copper mesh. All of the above are based on 100Kg of dry pulp.

[0025] After collecting the deinked pulp, make a sheet on a standard paper former (quantitatively 200g / m 2 ...

Embodiment 2

[0030] (1) Pulping: Add Hong Kong waste newsprint into the pulper, add 0.02% alkaline lipase, 0.1% sodium hydroxide, 0.01% surfactant: cocoic acid monoethanolamide sulfosuccinic acid The mass ratio of monoester disodium to fatty acid potassium soap is 1:1, the pulping concentration is controlled at 15%, the disintegration is 20min, and the temperature is 55°C.

[0031] (2) Flotation: Flotation is carried out in a flotation tank. Dilute the disintegrated slurry to a slurry concentration of 1%, control the ventilation rate at 25-35L / h, and the pressure at 0.3-1M Pa. Flotation at room temperature for 15 minutes.

[0032] (3) Washing: After flotation, the pulp is diluted with water to a concentration of 0.2%, and washed through a 120-mesh copper mesh. All of the above are based on 100Kg of dry pulp.

[0033] After collecting the deinked pulp, make a sheet on a standard paper former (quantitatively 200g / m 2 ), measure the degree of dust, whiteness, residual ink, and calculate the...

Embodiment 3

[0038] (1) Pulping: Add 8# American waste newsprint into the pulper, add 0.02% alkaline lipase and cellulase 1:1 composition, 0.1% sodium hydroxide, 0.01% surface activity Agent: Potassium monododecyl phosphate, control pulp concentration 15%, disintegrate for 20min, temperature 55℃.

[0039] (2) Flotation: Flotation is carried out in a flotation tank. Dilute the disintegrated slurry to a slurry concentration of 1%, control the ventilation rate at 25-35L / h, and the pressure at 0.3-1M Pa. Flotation at room temperature for 15 minutes.

[0040] (3) Washing: After flotation, the pulp is diluted with water to a concentration of 0.2%, and washed through a 120-mesh copper mesh. All of the above are based on 100Kg of dry pulp.

[0041] After collecting the deinked pulp, make a sheet on a standard paper former (quantitatively 200g / m 2 ), measure the degree of dust, whiteness, residual ink, and calculate the yield. Whiteness and Residual Ink Concentration (ERIC) were measured by Tech...

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Abstract

The invention discloses a clean wastepaper deinking method comprising the steps that: A, wastepaper and water are added into a pulping machine; lipase with a weight of at least 0.01% of that of the wastepaper, sodium hydroxide with a weight of at least 0.05% of that of the wastepaper, and a surfactant with a weight of at least 0.01% of that of the wastepaper are added; a crushing time is at least 15min, and a crushing temperature is at least 35 DEG C, such that a pulp with a certain concentration is obtained; B, the pulp is added into a flotation cell, and is diluted, wherein an aeration volume of the floatation cell is at least 25L / h, a pressure is at least 0.3MPa, and a floatation time is at least 10min; and C, the pulp is further diluted and is washed by using a copper mesh.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a clean-production waste paper deinking method, in particular to a waste newsprint deinking method. Background technique [0002] At present, the paper industry is facing three major problems: resource shortage, energy shortage and serious pollution. Waste paper recycling is an effective way to solve these problems. The proportion of waste paper in the paper industry is increasing, and it has become an important raw material for the paper industry. Deinking is a key technology for waste paper recycling. The traditional deinking of waste paper adopts chemical method (mainly sodium soap method), which needs about 1.5% alkali, 1.5% water glass and 6-7‰ industrial soap. It is emulsified under the action. Chemical deinking of waste paper consumes a lot of chemicals and causes serious environmental pollution. Lipase is a special ester bond hydrolase that catalyzes at the oil-wa...

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 王剑英郑洪辉胡关键张清辉赖广才
Owner ANHUI LEVEKING BIOTECH CO LTD
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