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Method for deinking mixed office waste paper through composite biological enzyme

A technology of compounding biological enzymes and office waste paper, which is applied in the processing of waste paper, papermaking, paper recycling, etc., can solve the problems of large consumption of deinking agent and surfactant, inability to achieve efficient deinking, and environmental problems.

Inactive Publication Date: 2014-01-01
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, enzymatic deinking also has some disadvantages. For example, as a biocatalyst, enzymes have specificity in enzymatic catalysis, and the deinking effect of a single enzyme system is limited, and the effect of high-efficiency deinking cannot be achieved.
Enzyme deinking is usually used together with deinking agent and surfactant, which consumes a lot and causes certain environmental problems

Method used

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  • Method for deinking mixed office waste paper through composite biological enzyme
  • Method for deinking mixed office waste paper through composite biological enzyme

Examples

Experimental program
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Effect test

Embodiment １

[0042] (1) The office waste paper (the main components are laser printing paper, electrostatic copy paper, color laser printing paper and waste ledgers, provided by Fujian Youlanfa Paper Group, the specific composition is: the weight percentage is 46% of laser printing paper, Electrostatic copy paper 51%, color laser printing paper 1.9%, waste ledger 1.1%) are manually torn into 25*25mm pieces, soaked for 10 minutes, placed in a horizontal hydraulic pulper for 20 minutes until the fibers are basically dissociated, and dried by drying Squeeze dry, disperse and store in plastic bags for later use;

[0043] (2) Take the slurry obtained in step (1) with an absolute dry mass of 150g and add it to a pulper, add water to make a 9wt% slurry concentration, and add 6 drops of NaOH with a mass volume concentration of 0.05% after raising the temperature to 55°C. Concentration is 0.6% Na 2 SiO 3 Add 5 drops to adjust to pH 8.0-8.5;

[0044] (3) Add 200g / t dry-dried pulp quality co...

Embodiment 2

[0047] (1) The office waste paper (the main components are laser printing paper, electrostatic copy paper, color laser printing paper and waste ledgers, provided by Fujian Youlanfa Paper Group, the specific composition is: the weight percentage is 46% of laser printing paper, Electrostatic copy paper 51%, color laser printing paper 1.9%, waste ledger 1.1%) are manually torn into 25*25mm pieces, soaked for 10 minutes, placed in a horizontal hydraulic pulper for 20 minutes until the fibers are basically dissociated, and dried by drying Squeeze dry, disperse and store in plastic bags for later use;

[0048] (2) Take the slurry obtained in step (1) with an absolute dry mass of 150g and add it to a pulper, add water to make a 9wt% slurry concentration, and add 4 drops of NaOH with a mass volume concentration of 0.05% after the temperature is raised to 55°C. Concentration is 0.6% Na 2 SiO 3 Add 5 drops to adjust to pH 7.5-8.0;

[0049] (3) Add the compound biological enz...

Embodiment 3

[0052] (1) The office waste paper (the main components are laser printing paper, electrostatic copy paper, color laser printing paper and waste ledgers, provided by Fujian Youlanfa Paper Group, the specific composition is: the weight percentage is 46% of laser printing paper, Electrostatic copy paper 51%, color laser printing paper 1.9%, waste ledger 1.1%) are manually torn into 25*25mm pieces, soaked for 10 minutes, placed in a horizontal hydraulic pulper for 20 minutes until the fibers are basically dissociated, and dried by drying Squeeze dry, disperse and store in plastic bags for later use;

[0053] (2) Take the slurry obtained in step (1) with an absolute dry mass of 150g and add it to a pulper, add water to make a 9% slurry concentration, and add 6 drops of NaOH with a mass volume concentration of 0.05% after raising the temperature to 55°C. Concentration is 0.6% Na 2 SiO 3 Drop 5 drops to adjust to pH 8.5-9.0;

[0054] (3) Add the compound biological enzyme...

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Abstract

The invention discloses a method for deinking mixed office waste paper through composite biological enzyme. The method comprises the steps as follows: office waste paper is torn into 25*25 mm scraps with hands, and the scraps are soaked for 10 min and placed in a horizontal type hydrapulper for fluffing, so that standby pulp is obtained; the standby pulp is placed in the hydrapulper, water is added, the temperature is raised, the pH is adjusted, the composite biological enzyme and a surface active agent are added, and the mixture is mixed with the slurry; and finally, the slurry is poured into a flotation device, water is added for adjusting the slurry concentration to be 0.5%, the pH is adjusted to 8.0-8.5, an air pump and a slurry recycle switch of the flotation machine are switched on, and flotation is timed when a bubble pops out of a flotation tank; and after flotation, aeration and slurry recycle are stopped, and the slurry is poured into a filter bag to be squeezed, dried and dispersed for sheet making. According to the method, the waste paper dust degree is greatly reduced, the Eric value is decreased, and at the same time, the tensile index and the burst index of the paper are improved, so that the paper can have higher application values.

Description

technical field [0001] The invention relates to a method for deinking waste paper with biological enzyme, in particular to a method for deinking mixed office waste paper with compound biological enzyme. Background technique [0002] In recent years, my country's paper industry has developed rapidly, surpassing the United States in 2009 to become the world's largest producer and consumer of paper products. With the increase of output, the consumption of papermaking raw materials is also increasing. As a reusable secondary fiber resource, waste paper can not only protect forest resources to a certain extent, alleviate the huge demand pressure on natural resources from the development of the paper industry, but also reduce water and energy consumption and environmental pollution. my country's recycling and reuse of waste paper resources is also increasing year by year. According to the statistics of the China Paper Association, in 2002, the proportion of waste paper pulp in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 刘婧黄六莲陈礼辉罗小林
Owner FUJIAN AGRI & FORESTRY UNIV
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