CN109137594B - Recycling process of waste paper pulping tailings - Google Patents
Recycling process of waste paper pulping tailings Download PDFInfo
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- CN109137594B CN109137594B CN201810930346.XA CN201810930346A CN109137594B CN 109137594 B CN109137594 B CN 109137594B CN 201810930346 A CN201810930346 A CN 201810930346A CN 109137594 B CN109137594 B CN 109137594B
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- tailings
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
Abstract
The invention relates to a process for recycling waste paper pulping tailings, which comprises the following steps: separation: sorting the tailings into coarse heavy slag, fine slag and tailings; and (3) treating coarse and heavy slag: separating wood and construction waste in the coarse and heavy slag by a manual sorting mode, and conveying residual waste materials after separating metal iron in the coarse and heavy slag by using an iron remover to a near-infrared optical sorting machine to sort and pack plastic in the coarse and heavy slag; and (3) fine slag treatment: mixing fine slag and water into fine slag slurry, injecting the fine slag slurry into a friction cleaning machine for cleaning, carrying out solid-liquid separation on the fine slag slurry cleaned by the friction cleaning machine, and removing metal and sand in the separated precipitate by using a high-concentration slag remover; treatment of tailings: and (4) discharging the tailings after shredding treatment into a clean sedimentation tank for solid-liquid separation, and screening solid waste residues from separated clear liquid. The process does not cause secondary pollution to the environment, and plays a role in promoting the construction of green, environment-friendly and sustainable economy.
Description
Technical Field
The invention relates to the field of papermaking processes, in particular to a process for recycling waste paper pulping tailings.
Background
The recycled waste paper can be reasonably treated to obtain qualified slurry for producing paper products, tailings can be generated in the pulping process of the waste paper, and the tailings mainly comprise the following components: the pulping and papermaking by utilizing the waste paper is a resource utilization process, but tailings generated in the process can cause secondary pollution to the environment, and the construction of the economy which is green, environment-friendly and sustainable in development is greatly hindered.
Disclosure of Invention
Therefore, a recycling process of the waste paper pulping tailings is needed to solve the problem of waste paper pulping tailing pollution.
In order to achieve the aim, the inventor provides a process for recycling the tailings generated in the pulping of the waste paper, which comprises the following steps:
separation: sorting the tailings into coarse heavy slag, fine slag and tailings;
and (3) treating coarse and heavy slag: separating wood and large building garbage in the coarse and heavy residues by a manual sorting mode, conveying the residual waste materials after separating metal iron in the coarse and heavy residues by using an iron remover to a near-infrared optical sorting machine to sort and pack plastic in the coarse and heavy residues, separating and packing nonferrous metals by using a nonferrous metal separator, shredding the residual waste materials, and stacking the shredded waste materials into a waste residue storage yard;
and (3) fine slag treatment: mixing fine slag and water into fine slag slurry, injecting the fine slag slurry into a hydrapulper for cleaning, cleaning by a friction cleaning machine, concentrating the fine slag slurry cleaned by the friction cleaning machine, and removing metal and sand particles in the fine slag slurry by a high-concentration slag remover;
treatment of tailings: and (4) cleaning tailings in a friction cleaning machine, filtering the tailings, and dehydrating the tailings to enter a storage yard.
Further, in the step of processing the fine slag, the precipitated heavy slag obtained by mixing the fine slag with water is separated from nonferrous metals in a nonferrous metal separator and packaged.
Further, supernatant liquid obtained by solid-liquid separation in the fine slag treatment step is pumped into a hydrapulper through a water pump for recycling, and is mixed with fine slag to form fine slag slurry.
Furthermore, the treatment step of the tailings is to perform dehydration treatment after crushing treatment.
Further, the packed solid waste residues in the treatment step of the tailings are crushed and then granulated and collected in a bin by a granulator.
And further, injecting the tailings cleaned by the friction cleaning machine in the treatment step of the tailings into a rinsing sedimentation tank for secondary cleaning, then carrying out solid-liquid separation, screening solid waste residues from separated clear liquid, putting the solid waste residues into the friction cleaning machine for cleaning again, and carrying out dehydration treatment and packaging after cleaning for recycling.
Furthermore, the sediment slag in the rinsing sedimentation tank is taken out by a screw conveyor and then is dehydrated, and then is shredded and stacked into a slag yard.
Different from the prior art, the technical scheme has the following advantages: the waste paper pulping tailings are continuously separated into coarse heavy slag, fine slag and tailings for treatment, the coarse heavy slag, the fine slag and the tailings are respectively and continuously separated according to components in the coarse heavy slag, the fine slag and the tailings, recyclable materials are separated from the waste paper pulping tailings for recycling, the waste paper pulping tailings recycling process cannot cause secondary pollution to the environment, and the process plays a role in promoting the construction of green, environment-friendly and sustainable economy.
Drawings
Fig. 1 is a process flow diagram of a recycling process of waste paper pulping tailings in the present embodiment.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the embodiment provides a recycling process of waste paper pulping tailings, which includes the following steps:
separation: sorting the tailings into coarse and heavy residues, fine residues and tailings by using a bouncing screening machine, wherein the model of the bouncing screening machine is ReBal40, the aperture of a sieve pore is 80mm, and the treatment capacity is 12.5 t/h; tailings directly leak to the lower part of the bounce screening machine from a screen of the bounce screening machine, coarse and heavy residues are arranged at the lower end of the screen, tailings are arranged at the high-end tail part of the screen, and a conveyor is arranged below the bounce screening machine and used for conveying the coarse and heavy residues, the fine residues and the tailings.
The principle of the sorting of the bouncing screening machine is a processing method for realizing the separation of the solid wastes from each other by generating different motion speeds and bouncing tracks when the solid wastes move on an inclined plane of the bouncing screening machine or collide with the inclined plane according to the difference of the weight and the granularity of each component of each solid waste in the waste paper pulping tailings. Therefore, in the bouncing process of the solid waste on the inclined plane of the bouncing screening machine, the bouncing motion tracks of the coarse and heavy slag, the fine slag and the tailings are different, so that the coarse and heavy slag, the fine slag and the tailings are separated and then are respectively conveyed to the next working procedure through the conveyor.
And (3) treating coarse and heavy slag: wood and massive construction waste in the coarse and heavy slag are separated in a manual sorting mode, metal iron in the coarse and heavy slag is separated by using an iron remover, and the rest waste is conveyed into a swing sieve to disperse the coarse and heavy slag in the high-frequency swing process of the swing sieve. Conveying the dispersed coarse and heavy slag into an infrared optical sorting machine to sort and pack the plastic in the coarse and heavy slag, wherein the infrared optical sorting machine is used for sorting the plastic according to different plastic spectrums, and specifically a PLC (programmable logic controller) of the infrared optical sorting machine is used for controlling the sorting work of the infrared optical sorting machine, the model of the infrared optical sorting machine is TT-2160-04-17-1001, and the infrared optical sorting machine is used for respectively sorting, packing and recycling PET, PP and PE in the coarse and heavy slag; and separating and packing the non-ferrous metal from the residual coarse heavy slag by using a non-ferrous metal separator, wherein the type of the non-ferrous metal separator is ReMet1000BP, the magnetic flux is 1000Wb, the width of a belt is 1000mm, the residual waste is crushed and then stacked into a waste slag storage yard, and the conveying is carried out among all the working procedures by using a conveyor.
The type of the iron remover used in this example was RCYD-10, the magnetic flux was 70Wb, and the belt width of the iron remover was 1000 mm.
The oscillating screen used in this example was of the type ZSK2500 x 1900.
In the present embodiment, the nonferrous metal is mainly aluminum such as can.
And (3) fine slag treatment: mixing fine slag and water into fine slag slurry, and injecting the fine slag slurry into a hydrapulper for cleaning, wherein the fine slag and the water are mixed into the fine slag slurry through the hydrapulper, the flow Q of the fine slag slurry is 40T/H, the water content of the fine slag slurry is 50%, and the concentration of the fine slag slurry is 1% -1.5%. Mixing the paper scraps, the paper scraps and water in the fine slag to form fine slag slurry, wherein the fine slag comprises paper pulp, fine metal and sand particles, small plastic sheets and the like. And (3) precipitating the heavier slag in the fine slag slurry in a precipitation tank of a hydrapulper, grabbing out the heavy slag by using a hydraulic grab bucket machine, separating nonferrous metals such as pop cans and the like in the grabbed heavy slag by using a nonferrous metal separator, packaging, and putting the rest waste material pile into a waste slag storage yard. In the slurry scum of the hydrapulper, fine slag slurry containing paper pulp, plastic slag, fine metal and sand grains is injected into a friction cleaning machine for friction cleaning, the fine slag slurry cleaned by the friction cleaning machine is filtered and concentrated by an inclined screen, and the metal and the sand grains are removed by a high-concentration slag remover. Concentrating the fine slag slurry cleaned by the friction cleaning machine, wherein the concentration mode is as follows: in the embodiment, the fine slag slurry is concentrated by using an inclined screen, metal and sand grains in the concentrated slurry are removed by using a high-concentration slag remover, the feeding concentration of the high-concentration slag remover is 3-4%, and substances with large specific gravity, such as the metal and the sand grains, in the concentrated slurry are removed. The working principle of the high-concentration slag remover is as follows: impurities are separated by utilizing the specific gravity difference between fibers and the impurities, sand particles, metal and other heavy impurities sink into the tank body, and slurry cannot enter the slag settling tank, so that metal, sand particles and other substances with larger specific gravity are separated from the slurry. And (4) condensing and dehydrating the fine slag cleaned by the friction cleaning machine by a screw extruder, and stacking the fine slag into a waste slag storage yard.
In a preferred embodiment, the supernatant liquid after solid-liquid separation in the fine slag treatment step is pumped into a hydrapulper for recycling through a water pump and is mixed with fine slag to form fine slag slurry.
The types of hydrapulpers used in this example were: ZDS86, a hydropulper volume of 50m3, a hydropulper impeller diameter of 1950mm, and a mesh diameter of 12 mm.
The rotating speed of the friction cleaning machine used in the embodiment is 1100r/min, and the diameter of the sieve hole is 12 mm.
The model of the high concentration scummer that uses in this embodiment is: ZSC 14.
Treatment of tailings: the tailings well shredder is used for shredding large impurities in the tailings and also comprises fine slag screened by a friction cleaning machine sieve plate in the fine slag processing step, and the solid-liquid separation mode is as follows: intermittent precipitation, in this example, tailings are injected into a precipitation tank for continuous precipitation separation. The heavy slag deposited is grabbed out by a hydraulic grab bucket, the grabbed heavy slag is crushed by a heavy slag crusher, dewatered by a dewatering machine and enters a waste slag storage yard, the residual tailings are placed in a friction cleaning machine for primary cleaning, and water discharged from the two friction cleaning machines enters a gravity multi-disc filter for recycling. The method comprises the following steps that slag materials filtered out from multiple gravity discs are dewatered by a screw extruder and then stacked in a storage yard, the rest tailings enter a rinsing sedimentation tank for secondary sedimentation, the sediment slag is conveyed to a temporary storage yard by a screw conveyor and then enters the storage yard together with heavy slag grabbed by a hydraulic grab bucket after being crushed, light dross is placed in a friction cleaning machine for secondary cleaning, water enters the multiple discs for recycling after being filtered, the tailings are dewatered and packaged by a dewatering packaging machine and then are stacked in the storage yard, then the tailings are crushed by a crushing machine again and then enter a granulating machine for granulation, plastic particles packaged by final products enter a warehouse, and the tailings of the granulating machine enter the storage yard after being crushed.
The shredder type used in this example is: ETS1600, the knife width of the shredder was 40 mm.
The hydraulic grab machine used in this embodiment is of the type: LD5T, volume 1.5m 3.
The heavy slag crusher used in this example was of the type: UG1600H, and the diameter of the sieve hole of the heavy slag crusher is 80 mm.
The gravity multi-disk used in this embodiment is of the type: ZNP35 multiplied by 16, the diameter of the disc is 3500mm, the number of the installation discs is 16, the number of fan-shaped plates of each disc is 8, the installation filtration area is 240m2, the concentration of the inlet is 0.8 percent, and the concentration of the slurry outlet is 3 percent to 4 percent).
The crusher model used in this example was UG1600H with a mesh diameter of 80 mm.
The pelletizer used in this example was INTAREMA 2018TVEPLUS, the capacity was 1.8-2.2 tons/hr, the filtration area: 2940cm2。
And conveying the garbage in the waste residue storage yard to a garbage boiler for incineration, and treating incineration tail gas of the garbage.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (6)
1. A process for recycling waste paper pulping tailings is characterized by comprising the following steps:
separation: sorting the tailings into coarse and heavy residues, fine residues and tailings by using a bounce screening machine;
and (3) treating coarse and heavy slag: separating wood and large building garbage in the coarse and heavy residues by a manual sorting mode, conveying the residual waste materials after separating metal iron in the coarse and heavy residues by using an iron remover to a near-infrared optical sorting machine to sort and pack plastic in the coarse and heavy residues, separating and packing nonferrous metals by using a nonferrous metal separator, shredding the residual waste materials, and stacking the shredded waste materials into a waste residue storage yard;
and (3) fine slag treatment: mixing fine slag and water into fine slag slurry, injecting the fine slag slurry into a hydrapulper for cleaning, cleaning by a friction cleaning machine, concentrating the fine slag slurry cleaned by the friction cleaning machine, and removing metal and sand particles in the fine slag slurry by a high-concentration slag remover;
treatment of tailings: cleaning tailings in a friction cleaning machine, filtering the tailings, and dehydrating the tailings to enter a storage yard;
and in the treatment step of the tailings, the tailings cleaned by the friction cleaning machine are injected into a rinsing sedimentation tank for secondary cleaning, then solid-liquid separation is carried out, solid waste residues are screened from separated clear liquid, the solid waste residues are placed in the friction cleaning machine for cleaning again, and the solid waste residues are dewatered and packaged for recycling after cleaning.
2. The recycling process of the wastepaper pulping tailings of claim 1, wherein the recycling process comprises the following steps: in the step of processing the fine slag, the precipitated heavy slag obtained by mixing the fine slag with water is separated from non-ferrous metal in the heavy slag by a non-ferrous metal separator and is packed.
3. The recycling process of the wastepaper pulping tailings of claim 1, wherein the recycling process comprises the following steps: and pumping supernatant liquid obtained by solid-liquid separation in the fine slag treatment step into a hydrapulper for recycling through a water pump, and mixing the supernatant liquid and the fine slag to form fine slag slurry.
4. The recycling process of the wastepaper pulping tailings of claim 1, wherein the recycling process comprises the following steps: and in the treatment step of the tailings, the tailings are crushed and then dehydrated.
5. The recycling process of the wastepaper pulping tailings of claim 1, wherein the recycling process comprises the following steps: and in the treatment step of the tailings, the packed solid waste residues are crushed and then granulated and collected in a bin by a granulator.
6. The recycling process of the wastepaper pulping tailings of claim 1, wherein the recycling process comprises the following steps: and taking out the sediment slag in the rinsing sedimentation tank by a screw conveyor, dewatering, shredding and stacking into a waste slag storage yard.
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| CN109722929B (en) * | 2019-03-18 | 2021-03-02 | 安德里茨（中国）有限公司 | Waste residue treatment system |
| CN110142284B (en) * | 2019-05-31 | 2021-01-26 | 联盛纸业（龙海）有限公司 | Waste residue deironing dewatering equipment |
| CN110409207B (en) * | 2019-08-01 | 2020-09-29 | 山鹰国际控股股份公司 | Waste paper light slag recovery treatment process |
| CN110331611A (en) * | 2019-08-07 | 2019-10-15 | 山鹰国际控股股份公司 | A kind of waste paper pulp-making fine screen tailings treatment process |
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| US4919797A (en) * | 1989-02-09 | 1990-04-24 | The Black Clawson Company | Screening apparatus for paper making stock |
| CN100457280C (en) * | 2005-03-18 | 2009-02-04 | 曾碚凯 | Separating method and system for waste paper and waste plastic mixture |
| CN102154877A (en) * | 2010-12-31 | 2011-08-17 | 中冶纸业银河有限公司 | Grinding process for domestic waste paper |
| CN105780570B (en) * | 2014-12-15 | 2017-07-28 | 福建利树股份有限公司 | Wastepaper pulping and papermaking production method |
| CN205223719U (en) * | 2015-12-21 | 2016-05-11 | 汕头市龙湖区粤安纸业有限公司 | Waste paper slurrying, drifting system |
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