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High-efficiency adhesion and purification method for fine stickies in papermaking white water based on high surface roughness of hydrophobic materials

A technology of hydrophobic materials and papermaking white water, which is applied in papermaking, papermaking machines, textiles and papermaking, etc., can solve the problems of excessive accumulation and obstacles of fine stickies, and achieve the effects of improving adhesion efficiency, reducing interference, and high practical value

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the control of fine stickies in white water is mainly to make them exist stably in white water, or to fix them on the fiber surface and take them out of the papermaking system. As the waste paper increases, the fine stickies fixed on the fibers will continue to return to the papermaking system with the recycling of waste paper, making the accumulation of fine stickies in white water more and more, eventually causing serious obstacles
[0007] Therefore, the existing micro-stickies treatment technology cannot solve the problems caused by the stickies to the pulp and paper industry, especially the problem of micro-stickies in the papermaking stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for efficiently adhering and purifying fine stickies in papermaking white water based on the high surface roughness of hydrophobic materials, comprising the following steps:

[0031]1) White water pretreatment: use the adhesive sample A retrieved from the factory to coat the copy paper with a thickness of 0.02-0.05mm, prepare a slurry through pulping, and then sieve it with a 200 mesh The dynamic water filter of the standard filter screen filters and recovers the fibers, fillers and other components contained therein, and obtains the solid content of 0.08, which contains components such as fine fibers with a particle size of less than 100um, fine stickies and fillers. % of papermaking white water after laboratory treatment.

[0032] 2) Preheating treatment of white water micro-adhesives: Take the paper-making white water after step 1) and use a symmetrical straight blade rotor to stir at a constant speed for 30 minutes under normal pressure conditions of a temp...

Embodiment 2

[0038] Separately take the same batch of white water that has been filtered in step 1) in step 1), put it in the same container as step 2), and use the same rotor in step 2) to stir at a constant speed for 30 minutes at a temperature of 50°C and a rotation speed of 800r / min to carry out fine gelation. Preheat the sticky matter, take a sample, detect the size and quantity of the fine sticky matter particles in the unit volume of white water, and calculate the volume content of the fine sticky matter in the unit volume of white water to be 7.22×10 -1 mm 3 / mL; then fix the aluminum foil with the same rectangular size and a roughness value of 1.179 on the stirring rotor and continue to stir for 2 hours, and then the volume content of fine stickies per unit volume of white water after adhesion is detected to be 5.45×10 -1 mm 3 / mL L, the calculated adhesion removal efficiency of fine stickies is 24.52%; continue to stir, detect and calculate the volume content of white water fine...

Embodiment 3

[0041] Another batch of filtered white water in Example 1 was placed in the same container, and stirred at a constant speed with a rotor for 30 minutes at a temperature of 50°C and a rotation speed of 1500r / min to carry out preheating treatment of fine stickies, and samples were taken. 1 method to detect and calculate the volume content of fine stickies in the unit white water volume is 6.95×10 -1 mm 3 / mL; Then, in the same container, a 80mm×80mm square sheet-like structure was fixed on the surface of the stirring rotor, which was covered with a treated polyethylene film with a surface roughness of 1.163. Stir at a constant speed for 2 hours, take samples using the method of Example 1 to detect and calculate the volume content of fine sticky particles in white water per unit volume after adhesion is 5.89×10 - 1 mm 3 / mL, the calculated adhesion removal efficiency of fine stickies is 15.25%. After continuing to adhere at 50°C and 1500r / min for 4 hours, the method of Example...

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Abstract

The invention discloses a paper-making white water fine adhesive efficient adhesion purification method based on high surface roughness of hydrophobic material. The method includes the following stepsof: firstly, recovering the fiber and some fine components in paper-making white water, uniformly stirring the white water suspension to be purified at the temperature of 30-90 DEG C and the rotatingspeed of 50-2000r / min by using a rotor, stirring the treated white water by using a high surface roughness hydrophobic material rotor for more than 1 hour, wherein the white water fine adhesive is aggregated and adhered to the surface of the hydrophobic material rotor. The fine adhesive can be removed by replacing the rotor. According to the invention, the fine adhesive particles in the white water can be effectively removed, the content of fine adhesive particles in the white water can be significantly reduced, the operation rate of the paper machine can be improved and the quality of paperproduct can be improved, meanwhile, no chemical reagent is introduced during operation, the chemical environment of the white water system is not changed, and the method has the advantages of low cost, simple operation and obvious effect.

Description

technical field [0001] The invention relates to the purification of fine stickies in papermaking white water, in particular to a method for purifying fine stickies in waste paper papermaking white water that negatively affects paper machine, operation and paper product quality; it belongs to the technical field of secondary fiber recycling. Background technique [0002] The current shortage of fiber resources, higher and higher requirements for environmental protection, and the inevitable trend of energy conservation and emission reduction have prompted waste paper to be used as a raw material for papermaking. With the development of the modern paper industry, waste paper has become the most important in the pulp and paper industry today One of the raw materials. However, with the increase of the degree of closure of the pulp and paper white water circulation system and the improvement of the recycling rate of waste paper, stickies in waste paper pulp have brought more and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F1/66
CPCD21F1/66
Inventor 李擘曹晓利耿胜芳唐亚男刘道恒武书彬
Owner SOUTH CHINA UNIV OF TECH
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