Environmental-protection waste paper deinking method

A waste paper deinking and environmental protection technology, which is applied in the processing of waste paper, paper making, paper recycling, etc., can solve the problems of equipment operating environment, slurry quality and subsequent wastewater treatment, so as to reduce the difficulty of sewage treatment and protect the environment , high whiteness effect

Inactive Publication Date: 2015-12-23
HEFEI LONGFA PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, sodium hydroxide is generally added in the deinking process of office waste paper, and the pH value is required to be above 10. In a highly alkaline environment, the ink and the fiber are easily separated, but the equipment, operating environment, pulp quality, subsequent wastewater treatment, etc. quite unfavorable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for deinking environmentally friendly waste paper, comprising the following steps:

[0020] (1) Put the waste paper into the collection frame, which is a stainless steel sieve frame with a hole diameter of 1 mm, put the collection frame into the washing pool, and vibrate the collection frame up and down for preliminary cleaning;

[0021] (2) The waste paper after preliminary cleaning is vacuum stirred and pulverized. The mass concentration of the waste paper pulp is 20%. During the pulverization process, pectinase and amylase are added at a ratio of 1:3 and the temperature is 45°C. The amount is 0.01% of the absolute dry weight of waste paper;

[0022] (3) Carry out gradient centrifugation on the crushed waste paper to further remove impurities in the waste paper;

[0023] (4) Put the centrifuged waste paper pulp into a non-woven bag with a thickness of 0.8 mm and a pore size of 60 μm, add water at a frequency of 40 KHz, and perform ultrasonic pulverization fo...

Embodiment 2

[0027] A method for deinking environmentally friendly waste paper, comprising the following steps:

[0028] (1) Put the waste paper into the collection frame, which is a stainless steel sieve frame with a hole diameter of 1.5mm, put the collection frame into the washing pool, and shake the collection frame up and down for preliminary cleaning;

[0029] (2) The waste paper after preliminary cleaning is vacuum stirred and pulverized. The concentration of the waste paper pulp is 23%. During the pulverization process, pectinase and amylase are added at a ratio of 1:3 and the temperature is 50°C. The amount is 0.015% of the dry weight of waste paper;

[0030] (3) Carry out gradient centrifugation on the crushed waste paper to further remove impurities in the waste paper;

[0031] (4) Put the centrifuged waste paper pulp into a non-woven bag with a thickness of 0.9 mm and a pore size of 70 μm, add water at a frequency of 45 KHz, and perform ultrasonic crushing for 28 minutes. Add l...

Embodiment 3

[0035] A method for deinking environmentally friendly waste paper, comprising the following steps:

[0036] (1) Put the waste paper into the collection frame, which is a stainless steel sieve frame with a hole diameter of 2 mm, put the collection frame into the washing pool, and vibrate the collection frame up and down for preliminary cleaning;

[0037] (2) The waste paper after preliminary cleaning was vacuum stirred and pulverized. The mass concentration of the waste paper pulp was 25%. During the pulverization process, pectinase and amylase were added at a ratio of 1:3 and the temperature was 55°C. The amount is 0.02% of the dry weight of waste paper;

[0038] (3) Carry out gradient centrifugation on the crushed waste paper to further remove impurities in the waste paper;

[0039] (4) Put the centrifuged waste paper pulp into a non-woven bag with a thickness of 1 mm and a pore size of 80 μm, add water at a frequency of 50 KHz, and perform ultrasonic crushing for 30 minutes...

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PUM

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Abstract

The invention discloses an environmental-protection waste paper deinking method; the method comprises the processes: preliminary cleaning, crushing enzyme treatment, ultrasonic enzyme treatment, flotation and washing. The environmental-protection waste paper deinking method provided by the invention can be applicable to deinking treatment of waste corrugated paper, waste newspaper, colored offset newsprint paper, waste books and magazine paper, office waste paper and laser and electrostatic duplicated paper, a used deinking agent is a bio-enzyme, the pH value of the entire treatment process is neutral, additional additives have no need for adjusting the pH value, the costs are saved, the quality of a waste paper pulp is improved, the difficulty of subsequent sewage treatment is reduced, produced wastewater can be recycled after simple treatment, resources are saved, the costs are reduced, and the environment is protected; a non-woven fabric is prepared from waste paper fibers, the price is low, and the costs are saved; and the waste paper after deinking has the advantages of less fiber loss, high whiteness, small dust degree, and good reutilization property.

Description

technical field [0001] The invention mainly relates to a waste paper deinking method, in particular to an environment-friendly waste paper deinking method. Background technique [0002] Packaging has two major functions: one is to protect the goods from damage and deterioration during the process of manufacturing, transportation, warehousing and sales; It meets the increasing material and cultural needs of consumers, and promotes and stimulates consumption. As an important packaging material, packaging paper has been widely used in product packaging in various industries. It includes container board and corrugated base paper, white cardboard and white cardboard, beverage flexible packaging paper, special packaging paper, etc. [0003] 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 trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02
CPCY02W30/64
Inventor 林悦敏
Owner HEFEI LONGFA PACKING CO LTD
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