Neutral deinking method for waste newspaper

A newsprint, neutral technology, applied in the field of pulp and paper making, can solve the problems of affecting the deinking effect, reducing the whiteness of pulp, and poor adaptability of raw materials, etc., achieve good social and environmental benefits, improve deinking efficiency, and reduce pollution load effect

Inactive Publication Date: 2006-04-26
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deinking is the key to waste paper recycling technology. The current deinking technology basically adopts the traditional alkaline chemical deinking technology. The disadvantages of the alkaline chemical deinking technology are very obvious. It is not adaptable to raw materials and is not suitable The removal of ink from office waste paper containing more electrostatic copy paper and laser printing paper limits the recovery rate of these high-quality waste paper; in addition, a large amount of chemicals are used in the deinking process, which causes an increase in the pollution load of deinking wastewater , for waste paper containing more mechanical pulp, the phenomenon of "alkali blackening" is prone to occur in the process of alkaline deinking, resulting in a decrease in pulp whiteness
In addition, in alkaline media, some inks form active dispersants and become overdispersed, causing small particles to redeposit on the fiber surface, affecting the deinking effect. It can be seen that alkaline deinking has become less and less suitable for waste To meet the needs of rapid development of paper utilization, it must be replaced by a new deinking method that is more environmentally friendly, more adaptable to waste paper, and has improved performance on waste paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: 8# U.S. waste newsprint (8# U.S. waste) deinking

[0014] (1) Pulping: Pulping is carried out in a pulper. 8# U.S. waste is added in the pulper, and 0.6% deinking agent lauryl fatty alcohol polyoxyethylene polyoxypropylene block copolymer (lauryl fatty alcohol, polyoxyethylene, polyoxypropylene) is added Mass ratio is 186:261:550), 3% sodium bicarbonate. Control the pulp concentration to 10%, the temperature to 40°C, the pre-soaking time to 15 minutes, the pulping time to 15 minutes, and the holding time to 15 minutes. During the pulping process, the rotor rotation frequency of the pulper is 15-60Hz. The above are percentages by weight, the same below.

[0015] (2) The flotation is carried out in the flotation tank, the pulp after the disintegration is diluted to 1% of the pulp concentration, and the ventilation rate is controlled to be 7-28m 3 / h, the pressure is 0.1-1.0MPa, flotation at room temperature for 15min.

[0016] (3) Washing is to dilute t...

Embodiment 2

[0019] (1) Pulping: Pulping is carried out in a pulper, 8# American waste is added to the pulper, and 0.4% deinking agent lauryl fatty alcohol polyoxyethylene ether, 0.2% dodecyl Sodium sulfonate, 3% sodium bicarbonate. Control the slurry concentration of 10%, the temperature is 40°C, the pre-soaking time is 10 minutes, the pulping time is 20 minutes, and the holding time is 20 minutes. During the pulping process, the rotor rotation frequency of the pulper is 15-60Hz. The above are percentages by weight, the same below.

[0020] (2) The flotation is carried out in the flotation tank, the pulp after the disintegration is diluted to 1% of the pulp concentration, and the ventilation rate is controlled to be 7-28m 3 / h, the pressure is 0.1-1.0MPa, flotation at room temperature for 20min.

[0021] (3) Washing is to dilute the pulp after flotation to a pulp concentration of 0.3%, and wash it through an 80-mesh copper mesh.

Embodiment 3

[0023] (1) Pulping: Pulping is carried out in a pulper, 8# American waste is added in the pulper, and 0.6% deinking agent lauryl fatty alcohol polyoxyethylene polyoxypropylene block copolymer ( The mass ratio of lauryl fatty alcohol, polyoxyethylene, polyoxypropylene is 186:261:550), 3% sodium tripolyphosphate. Control the slurry concentration of 10%, the temperature is 40°C, the pre-soaking time is 30 minutes, the pulping time is 50 minutes, and the holding time is 40 minutes. During the pulping process, the rotor rotation frequency of the pulper is 15-60Hz. The above are percentages by weight, the same below.

[0024] (2) The flotation is carried out in the flotation tank, the pulp after the disintegration is diluted to 1% of the pulp concentration, and the ventilation rate is controlled to be 7-28m 3 / h, the pressure is 0.1-1.0MPa, flotation at room temperature for 30min.

[0025] (3) Washing is to dilute the pulp after flotation to a pulp concentration of 0.5%, and wash...

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PUM

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Abstract

The invention discloses a newsprint neutral voiding method in the pulping paper making technique domain with pulping, floating, scrubbing and bleaching procedure, which is characterized by the following: adapting flotation-scrubbing method without alkali; inputting 0.1 úÑ-2.0úÑ voiding agent, 1úÑ-6úÑ inorganic salt in the floating course; controlling the floating paste density between 2 and 18 percent, temperature between 20 and 70 deg.c, pre-impregnated time between 0 to 40 min, floating time between 10 and 60 min, insulating time between 0 and 40 min; The method improves the voiding efficiency and voiding paste whiteness by 16.6 percent as well as reduces the CoDcr in the neutral voiding waste-water by 190mg/l, which lessens the waste-water pollution load.

Description

(1) Technical field [0001] The invention relates to a neutral deinking method of waste newsprint, belonging to the technical field of pulping and papermaking. (2) Background technology [0002] The recycling of waste paper is an effective way to solve the three major problems faced by the paper industry, such as shortage of raw materials, energy shortage and serious pollution. Deinking is the key to waste paper recycling technology. The current deinking technology basically adopts the traditional alkaline chemical deinking technology. The disadvantages of the alkaline chemical deinking technology are very obvious. It is not adaptable to raw materials and is not suitable The removal of ink from office waste paper containing more electrostatic copy paper and laser printing paper limits the recovery rate of these high-quality waste paper; in addition, a large amount of chemicals are used in the deinking process, which causes an increase in the pollution load of deinking wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/02C09D9/04D21B1/34D21C9/00D21C9/08
CPCY02W30/64
Inventor 傅英娟秦梦华王守娟徐清华
Owner QILU UNIV OF TECH
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