Production method for recycling fiber through cleaning light dreg of OCC pulping line

A technology for recycling fibers and production methods, which is applied in the field of pulp and paper production, and can solve the problems of large amount of light residue and tailing residue loss, etc., and achieve the effects of light weight of finished products, reduction of raw material consumption, and convenient transportation

Active Publication Date: 2016-12-07
LIANSHENG PAPER IND LONGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, it is necessary to provide a production method for cleaning and recovering fibers from light slag of OCC pulping line, which is used to effectively recover the fibers contained in light slag, and solve the problem of large total loss of light slag tailings in large paper mills

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of production method of OCC pulping line light slag cleaning recovery fiber of the present invention comprises the following steps:

[0031] Collect broken:

[0032] Collect the light slag discharged from the cylinder screen in the crushing section of the OCC pulping line, use the D-type hydraulic pulper to crush the light slag again, and the crushed material passes through the upper weir pool of the D-type hydraulic pulper Overflow to the light slag cleaning tank;

[0033] The light slag is transported to the D-type hydraulic pulper through the belt conveyor for further crushing.

[0034] Further, in the collecting and crushing step, complex microbial bacteria are added to the light slag cleaning tank for fermentation, and the complex microbial bacteria include Bacillus megaterium, Streptomyces griseus and Candida tropicalis. Adding complex microbial bacteria, in order to remove the odor in the slag liquid, make the fiber softer, and the paper made by then wil...

Embodiment 2

[0054] The difference between embodiment two and embodiment one is:

[0055] Recovery lyophilization:

[0056] The white water in the thick white water collection tank is pumped to the hydraulic inclined screen through the recycled white water pump, the recycled slurry recovered by the hydraulic inclined screen enters the recycled slurry pool, and the white water from the hydraulic inclined screen enters the thin white water pool for recycling in the light slag cleaning line;

[0057] Quickly freeze the recovered pulp at -20°C for 4 hours until it is completely frozen into recovered pulp blocks;

[0058] Vacuum-dry the recovered pulp block, the vacuum degree is controlled at 70Pa, and the temperature of the trap is ≤-25°C to obtain freeze-dried recycled fibers.

[0059]Steam rehydration:

[0060] The freeze-dried recycled fibers were sterilized by high-temperature steam for 1 hour, and the high-temperature steam sterilized while rehydrating the fibers.

[0061] In this embo...

Embodiment 3

[0063] The difference between embodiment three and embodiment one is:

[0064] Recovery lyophilization:

[0065] The white water from the thick white water collection tank is pumped to the hydraulic inclined screen through the recycled white water pump, the recycled slurry recovered by the hydraulic inclined screen enters the recycled slurry tank, and the white water from the hydraulic inclined screen enters the thin white water tank for recycling in the light slag cleaning line;

[0066] Quickly freeze the recovered pulp at -25°C for 3.5 hours until it is completely frozen into recovered pulp blocks;

[0067] Vacuum-dry the recovered pulp block, the vacuum degree is controlled at 90 Pa, and the temperature of the trap is ≤-25° C. to obtain freeze-dried recycled fibers.

[0068] Steam rehydration:

[0069] The freeze-dried recovered fibers were sterilized by high-temperature steam for 1.5 hours, and the high-temperature steam sterilized while rehydrating the fibers.

[0070...

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PUM

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Abstract

The invention relates to a production method for recycling fiber through cleaning light dreg of an OCC pulping line. The production method comprises the following steps: broken material collection: collecting the light dreg discharged from a cylinder screen on a breaking section on the OCC pulping line; light dreg cleaning: enabling pulp-water mixture to flow in a light dreg cleaning tank, and carrying out spraying cleaning on the light dreg by virtue of multiple spraying water pipes; dreg water separation: enabling white water floating at the upper part to flow into a concentrated white water collecting pool through difference of elevation, and intermittently discharging relatively heavy dreg water at the lower part of the cleaning tank to a discharging tank through a pneumatic switch valve; recycling and freeze-drying: introducing white water to a light dreg cleaning line for circular use, quickly freezing recycled pulp into recycled pulp blocks, and carrying out vacuum drying on the recycled pulp blocks, so as to obtain freeze-dried recycled fibers. Compared with the prior art, the production method has the advantages that paper pulp in the light dreg is recycled, so that the raw material consumption is reduced, and the production cost is lowered; the waste material is recycled, so that the current environmental requirements are met; and by utilizing a freeze-drying manner, the preserving property is good, the finished product is light and is convenient to transport.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking production, in particular to a production method for cleaning and recovering fibers from light slag of an OCC pulping line. Background technique [0002] In the prior art, the light slag discharged from the hydraulic light slag machine and the cylinder screen in the crushing section of the OCC line, due to the limitations of the existing equipment and technology, except for most of the light slag of plastic, also entrains a small amount of fiber. Traditional treatment The technology is to use an extruder to squeeze out the water carried by the light slag of the cylindrical sieve, and send the light slag to be incinerated in a thermal power plant for power generation or shipped out for treatment. The output of modern large-scale packaging paper factories is large, and the total amount of light slag discharged is large. If the fibers carried in the light slag are not recovered effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00D21C11/08
CPCD21C11/00D21C11/0064D21C11/08
Inventor 王贵敏陈光军周志强黄鸿李浩
Owner LIANSHENG PAPER IND LONGHAI
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