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Environmentally friendly waste paper deinking method

A technology for deinking and environmental protection of waste paper, applied in the field of papermaking, can solve the problems of accelerated ink ion removal, pollution of the environment, erosion of equipment, etc., to achieve the effect of improving whiteness, reducing dust and avoiding negative effects

Active Publication Date: 2012-06-27
ANHUI LEVEKING BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using biological enzymes to deink waste paper can not only reduce the consumption of chemicals in the waste paper recycling process and thus reduce environmental pollution, but also accelerate the deinking of ink ions In addition, due to the limitations of biological enzymes themselves, the use of biological enzymes to deink waste paper in the prior art still requires synergistic surfactants, and the use of surfactants still has a negative impact on equipment and the environment. Specifically, it erodes equipment and pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Pulp: Add 8# waste newsprint and 10# old magazine paper (8:2 ratio) and water into the pulper, add 0.02% of the weight of the waste paper with alkaline lipase, and 0.1% of the weight of the waste paper Sodium hydroxide, add 0.01% of the waste paper weight of tall oil, control the pulp concentration to 15%, the disintegration time is 20 minutes, and the disintegration temperature is 55℃;

[0025] (2) Flotation: Flotation is carried out in a flotation tank, the pulp is diluted with water to a concentration of 1%, the air flow is 30L / h, the pressure is 0.5M Pa, and the flotation is carried out at room temperature for 15 minutes;

[0026] (3) Washing: The flotation pulp is diluted with water to a concentration of 0.2%, and washed through a 120-mesh copper mesh.

Embodiment 2

[0037] (1) Pulping: Add Hong Kong used newsprint and water to the pulper, add 0.02% of the weight of waste paper alkaline lipase, 0.1% of the weight of waste paper, sodium hydroxide, and add 0.01% of the weight of waste paper to tall Oil, control pulp concentration 15%, disintegration time 20 minutes, temperature 55℃;

[0038] (2) Flotation: Dilute the pulped pulp with water to a concentration of 1% in the flotation tank, control the air flow to 35L / h, the pressure to 1M Pa, and flotation at room temperature for 15 minutes.

[0039] (3) Washing: The flotation pulp is diluted with water to a concentration of 0.2%, and washed through a 120-mesh copper mesh.

Embodiment 3

[0050] (1) Pulping: Add waste Nanfang Daily and water into the pulper, add 0.02% of the weight of waste paper alkaline lipase, 0.1% of the weight of waste paper sodium hydroxide, and add 0.01% of the weight of waste paper. Oil, control the pulp concentration to 15%, the disintegration time is 20 minutes, and the disintegration temperature is 55°C.

[0051] (2) Flotation: Dilute the pulped pulp with water to a concentration of 1% in the flotation tank, control the air flow to 35L / h, the pressure to 1M Pa, and flotation at room temperature for 15 minutes.

[0052] (3) Washing: The flotation pulp is diluted with water to a concentration of 0.2%, and washed through a 120 mesh copper mesh.

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Abstract

The invention discloses an environmentally friendly waste paper deinking method, which comprises the steps of: A. adding waste paper and water into a pulper, and simultaneously adding a biological enzyme which accounts for at least 0.01% of the weight of the waste paper, sodium hydroxide which accounts for at least 0.05% of the weight of the waste paper, and tall oil which accounts for at least 0.01% of the weight of the waste paper, controlling the pulping time at a minimum of 15min and the pulping temperature at a minimum of 35DEG C, thus obtaining a pulping slurry of a certain concentration; B. adding the pulping slurry into a flotation tank which has a ventilation volume of at least 25L / h and a pressure of at least 0.3MPa, and diluting the pulping slurry, with the flotation time maintained for at least 10 min; C. further diluting the pulping slurry and carrying out washing. The method of the invention uses tall oil and a biological enzyme for synergistic removal of ink from waste paper, and avoids the adverse effects of a surfactant on equipment and environments. Compared with waste paper deinking methods employing surfactants, the method provided in the invention produces a deinking slurry with substantially increased whiteness up to over 53%ISO, generates less dust, and make paper performance improved, thus boosting the progress of papermaking technologies.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to an environmentally friendly waste paper deinking method. Background technique [0002] The recycling of waste paper is an effective way to solve the three major problems faced by the paper industry: shortage of raw materials, energy shortage and serious pollution. Deinking treatment of waste paper is a key link in the process of recycling waste paper. [0003] The use of biological enzymes to deink waste paper can not only reduce the consumption of chemicals in the waste paper recycling process and thus reduce environmental pollution, but also accelerate the removal of ink ions. However, due to the limitations of biological enzymes, the existing technology The use of biological enzymes to deink waste paper still requires a synergistic surfactant. The use of surfactants still has a negative impact on equipment and the environment, specifically eroding equipment and polluting ...

Claims

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Application Information

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IPC IPC(8): D21C5/02C12S3/08
CPCY02W30/64
Inventor 王剑英胡关键郑洪辉
Owner ANHUI LEVEKING BIOTECH CO LTD
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