A method for reducing residual ink in black and white laser printing waste paper deinking pulp

A technology for deinking pulp and laser printing of waste paper, which is applied in the processing of waste paper, post-treatment of cellulose pulp, paper making, etc. Strong ability to achieve the effect of removal

Active Publication Date: 2017-11-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ink components used in black and white laser printing waste paper are special, mainly carbon powder and thermoplastic polymers, which are not easy to dissolve in water, and do not react with the deinking agent of traditional alkaline deinking, and deink accordingly less effective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Conventional black and white laser printing waste paper is used to produce deinked pulp, and the waste paper is subjected to hydropulping treatment. The treatment conditions are: NaOH dosage 1.2%, NaOH 2 SiO 3 Dosage 2.6%, H 2 o 2 The dosage is 1.2%, the dosage of deinking agent is 0.52%, the processing time is 25min, the pulp concentration is 10.0%, and the dispersing speed is 1400rpm. After pulping, enter the deinking section. The deinking conditions are: deinking agent dosage 0.3%, pulp concentration 1.0%, deinking time 18min, flotation deinking. After deinking, wash the slurry and carry out bleaching treatment. The bleaching process conditions are: NaOH consumption 1.2%, NaOH 2 SiO 3 Dosage 2.5%, EDTA dosage 0.3%, MgSO 4 Dosage 0.05%, H 2 o 2 The dosage is 2.2%, the temperature is 70°C, and the bleaching time is 2h. The performance indicators of the prepared deinked pulp are: whiteness 80.6% ISO, residual ink volume 743.4ppm, bulk thickness 2.16cm 3 g -1 ,...

Embodiment 2

[0020] Conventional black and white laser printing waste paper is used to produce deinked pulp, and the waste paper is subjected to hydropulping treatment. The treatment conditions are: NaOH dosage 1.1%, NaOH 2 SiO 3 Dosage 2.3%, H 2 o 2 The dosage is 1.3%, the dosage of deinking agent is 0.4%, the treatment time is 30min, the pulp concentration is 11.0%, and the dispersion speed is 1500rpm. After pulping, enter the deinking section. The deinking conditions are: deinking agent dosage 0.44%, pulp concentration 1.0%, deinking time 20min, flotation deinking. After deinking, wash the slurry and carry out bleaching treatment. The bleaching process conditions are: NaOH consumption 1.1%, NaOH 2 SiO 3 Dosage 2.4%, EDTA dosage 0.2%, MgSO 4 Dosage 0.05%, H 2 o 2 The dosage is 2.3%, the temperature is 70°C, and the bleaching time is 2.5h. The performance indicators of the prepared deinked pulp are: whiteness 79.8% ISO, residual ink volume 778.2ppm, bulk thickness 2.17cm 3 g -1 ...

Embodiment 3

[0023] Conventional black and white laser printing waste paper is used to produce deinked pulp, and the waste paper is subjected to hydropulping treatment. The treatment conditions are: NaOH dosage 1.2%, NaOH 2 SiO 3 Dosage 2.8%, H 2 o 2 The dosage is 1.2%, the dosage of deinking agent is 0.42%, the treatment time is 22min, the pulp concentration is 10.5%, and the dispersion speed is 1600rpm. After pulping, enter the deinking section. The deinking conditions are as follows: deinking agent dosage 0.28%, pulp concentration 1.1%, deinking time 16min, flotation deinking. After deinking, wash the slurry and carry out bleaching treatment. The bleaching process conditions are: NaOH consumption 1.2%, NaOH 2 SiO 3 Dosage 2.6%, EDTA dosage 0.4%, MgSO 4 Dosage 0.05%, H 2 o 2 The dosage is 2.4%, the temperature is 70°C, and the bleaching time is 2.25h. The performance indicators of the prepared deinked pulp are: whiteness 80.2% ISO, residual ink amount 762.5ppm, bulk thickness 2.1...

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Abstract

The invention relates to a method for reducing residual ink of black and white laser printing wastepaper deinked pulp. The method comprises the following steps: adding a mixed solvent prepared by combination of 1-butyl-3-methylimidazolium acetate and LiNO3 .2H2O into black and white laser printing wastepaper; then, adding lipase and lithium hydroxide, uniformly mixing chemicals and wastepaper with a medium-rich mixer, heating the mixed material to a preset temperature, and performing ultrasonic treatment to a preset time; and beating, washing and deinking the treated materials, leading a cleaning solution to flow into a solvent recycling system, and recycling the reclaimed solvent. The method can be used for effectively swelling fibers of black and white laser printing wastepaper and weakening the connection between fibers and black and white laser printing ink particles, so that the ink particles of black and white laser printing wastepaper can be effectively removed, the physical strength and optical performance of finished paper can be improved, the product quality of deinked pulp can be promoted, and environment-friendly processing of wastepaper fibers can be realized since the adopted mixed solvent has stable properties and can be easily reclaimed.

Description

technical field [0001] The invention relates to a method for improving the quality of black-and-white laser printing waste paper deinking pulp, in particular to a method by using 1-ethyl-3-methylimidazole acetate and LiNO 3 2H 2 The invention discloses a method of ultrasonically treating black-and-white laser printing waste paper under the action of lipase and lithium hydroxide as a solvent, and reducing the residual ink of black-and-white laser printing waste paper deinking pulp. Background technique [0002] Paper is an important carrier of knowledge preservation and cultural transmission, and it also plays a certain beautification role in people's daily life. Paper is closely related to people's daily life, and is even more closely connected with the development and progress of all walks of life. However, with the rapid development of the paper industry, a series of problems follow, especially the problem of environmental pollution. Therefore, more and more people pay ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/02D21B1/34D21C9/16
CPCD21B1/345D21C5/005D21C5/025D21C5/027D21C9/163Y02W30/64
Inventor 杨桂花陈嘉川庞志强刘小宁
Owner QILU UNIV OF TECH
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