CN109629298B - Method for reconstructing corrugated medium paper by using waste paper - Google Patents

Method for reconstructing corrugated medium paper by using waste paper Download PDF

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Publication number
CN109629298B
CN109629298B CN201811541443.6A CN201811541443A CN109629298B CN 109629298 B CN109629298 B CN 109629298B CN 201811541443 A CN201811541443 A CN 201811541443A CN 109629298 B CN109629298 B CN 109629298B
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paper
concentration
waste paper
pulping
pulp
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CN109629298A (en
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刘伟锋
赖耀康
刘志锋
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Dongguan Shunyu Paper Industry Co ltd
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Dongguan Shunyu Paper Industry Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0209—Methods, e.g. characterised by the composition of the agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D21C5/025—De-inking
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1063—Bleaching ; Apparatus therefor with compounds not otherwise provided for, e.g. activated gases
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Abstract

The invention discloses a method for reconstructing corrugated medium paper by using waste paper, which comprises the steps of pulping, high-concentration deslagging, multi-stage screening, centrifugal dewatering, oscillating and drying fiber, paper material preparation and pressing to form paper, thus completing the production of the corrugated medium paper. Compared with the prior art, the use of chemical agents can be reduced, and the environmental damage is reduced; the electric energy of the drying step before the paper material is pressed can be used, so that the paper material is processed in a more efficient and more environment-friendly mode, and the drying effect is better.

Description

Method for reconstructing corrugated medium paper by using waste paper
Technical Field
The invention relates to the technical field of waste paper papermaking, in particular to a method for reconstructing corrugated medium paper by using waste paper.
Background
At present, the trend of recycling waste paper to make paper is great. Compared with the raw wood pulp, the waste paper can reduce air pollution by 75 percent, water pollution by 35 percent, water consumption by 60 percent and energy consumption by 40 percent. The waste paper is used for papermaking, so that the occupation of a large amount of landfill space can be reduced. According to statistics, 850 kg of recycled paper with good quality can be produced by one ton of waste paper, 3 cubic meters of wood is saved, 300 kg of chemical raw materials is saved, 1.2 tons of coal is saved, and 600 degrees of electricity is saved.
The waste paper is used to regenerate corrugated medium paper, which is a plate block necessary for paper making industry. In the process of utilizing the waste paper to reproduce the corrugated medium paper, the steps of classifying the waste paper, pulping, deslagging, deinking and the like are required, and under the condition of larger yield, the production cost of partial links can be pertinently reduced, so that the method has great significance for reducing the overall production cost. Wherein the reaction temperature in the deinking step is higher than 65 ℃, and the energy consumption is larger; in the deinking process of the alkaline deinking agent, the fiber is easily oxidized, namely yellowed, and the whiteness is influenced; the consumption of the deinking agent is up to 3-5% of the absolute dry weight of the waste paper, and the treatment difficulty of the papermaking sewage is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for reconstructing corrugated medium paper by using waste paper, which can directly produce the corrugated medium paper by using roughly selected waste paper, simplifies the production steps of the regenerated corrugated medium paper, reduces the pollution to the environment, improves the paper performance and reduces the production cost.
Another object of the present invention is to provide a method for reconstructing corrugated medium paper using waste paper, which can improve drying efficiency, reduce energy consumption in the production process, and improve paper quality.
In order to achieve the purpose, the technical scheme adopted by the invention is that the method for reconstructing the corrugated medium paper by using the waste paper comprises the following steps:
1) a pulping step, comprising the following substeps:
1.1) a first high-concentration hydraulic pulping step, namely putting waste paper, a deinking agent and a compound biological enzyme into a high-concentration hydraulic pulper for carrying out first high-concentration hydraulic pulping, wherein the compound biological enzyme comprises cellulase, hemicellulase, lipase and lipase, the percentage ratio of the cellulase, the hemicellulase, the lipase and the lipase is 1-1.5: 1-1.8: 1-1.9: 1.5-2.5, the pulping temperature is controlled to be 40-65 ℃, and the pulping time is 5-10 min, so as to obtain first waste paper pulp, wherein the waste paper is high-quality waste newspaper or waste corrugated core paper, the deinking agent is added in an amount of 0.1-1.8% relative to the dry weight of the waste paper, the deinking agent is preferably a neutral deinking agent with a concentration of 30-45%, and the compound biological enzyme is added in an amount of 0.1-0.8% relative to the dry weight of the waste paper;
1.2) standing, namely stopping the high-concentration hydrapulper after the first high-concentration hydrapulper is finished, adding inert gas into a pulping cylinder of the high-concentration hydrapulper, closing the pulping cylinder after the pulping cylinder is filled with the inert gas, standing the first waste paper pulp in the pulping cylinder for 20-45 min, and controlling the temperature of the first waste paper pulp to be 40-65 ℃;
1.3) a second high-concentration hydraulic pulping step, wherein after the standing step is finished, a high-concentration hydraulic pulper is started to carry out second high-concentration hydraulic pulping on the first waste paper pulp, the temperature of the first waste paper pulp is controlled to be 50-70 ℃, and the pulping time is 5-10 min, so that second waste paper pulp is obtained;
in the process of pulping in water, the printing ink in the waste paper fiber is activated, so that the process steps are simplified, and the deinking rate is improved.
2) A high-concentration deslagging step, namely conveying the second waste paper pulp to a high-concentration deslagging device for high-concentration deslagging to obtain deslagging paper pulp;
3) bleaching, namely adjusting the concentration of the pulp subjected to deslagging to 10-15%, sending the pulp to a bleaching tank, adding composite bleaching powder, and uniformly stirring to obtain bleached pulp, wherein the adding amount of the composite bleaching powder is 0.5-2 kg/m3The composite bleaching powder comprises calcium hypochlorite and sodium percarbonate, the content of the calcium hypochlorite is 40-60%, the specific gravity of the calcium hypochlorite and the sodium percarbonate is 3:1, the stirring speed is 250-400 rpm, and the stirring time is 20-45 min;
4) a concentration and filtration step, namely delivering the bleached pulp to a vibrating screen for concentration and filtration to obtain concentrated paper stock, wherein the mesh number of the screen is 140-230 meshes, and the vibration frequency of the vibrating screen is 15-20 KHZ;
5) a centrifugal dehydration step, namely delivering the concentrated paper material to a centrifugal dehydration device for dehydration to obtain dehydrated paper material with the water content of 5-10%, wherein a dehydration cylinder of the centrifugal dehydration device is provided with a screen mesh, the mesh number of the screen mesh is 250-400 meshes, the dehydration rotation speed of the centrifugal dehydration device is 800-1500 rpm, and the operation time of the centrifugal dehydration device is 15-35 min;
6) adhesive mixing step, sending the dewatered pulp to a pneumatic mixer for adhesive mixing, so that the adhesive is uniformly attached to the waste paper fiber, wherein an atomizing nozzle is arranged in the pneumatic mixer, and the adhesive mixing step comprises the following substeps:
6.1) firstly, operating a pneumatic stirrer for 1-3 min to break up the dehydrated paper material;
6.2) then, spraying the adhesive on the dehydrated paper stock through an atomizing nozzle, wherein the atomizing nozzle continuously sprays the adhesive for 5-10 seconds, and the adding amount of the adhesive is 20-40 ml/kg of dehydrated paper pulp;
6.3) finally, continuing to operate the pneumatic stirrer for 2-5 min to realize uniform mixing of the dewatered paper pulp and the adhesive to obtain a paper material before pressing;
7) oscillating and drying the fibers, namely conveying the pre-pressed paper to an oscillating and drying device for further drying and dehydration, and activating an adhesive uniformly attached to the waste paper fibers, wherein the oscillating and drying device comprises an oscillating and conveying chain and a heat source, the heat source covers the oscillating and conveying chain, a plurality of trays for placing the pre-pressed paper and at least one track are arranged in the oscillating and conveying chain, the trays move on the track, the track is provided with a wave part, when the trays move on the track, the bottom of each tray is in abutting fit with the wave part of the track, so that the pre-pressed paper placed on the tray oscillates in the heating process, and the water content of the pre-pressed paper is reduced to 4-8%;
8) and a step of pressing paper, namely putting the paper material before pressing after the step of oscillating and drying the fibers into a paper pressing machine for rolling to obtain a paper roll, wherein a heating roller is arranged in the paper pressing machine, and pressing the paper material before pressing into paper through the heating roller, and the pressing temperature of the heating roller is 150-250 ℃.
The method for producing the corrugated medium paper by using the roughly selected waste paper material simplifies the production steps of re-papermaking, reduces the pollution to the environment, improves the performance of the paper and reduces the production cost.
In a further technical scheme, in the pulping step, the inert gas is carbon dioxide or nitrogen.
In a further technical scheme, in the high-concentration deslagging step, the wastewater discharged by the high-concentration deslagging device is filtered by a coarse screening device, then the filtered wastewater is sent to a wastewater tank for standing and precipitation, and after at least 5 hours of standing and precipitation, the wastewater can be used for participating in the pulping step. In the invention, the wastewater discharged by the high-concentration deslagging device still contains the deinking agent and the compound biological enzyme, but the wastewater can be secondarily utilized only by standing and precipitating because a large amount of separated ink particles exist in the wastewater.
In a further technical scheme, the coarse screening device is provided with a screen, and the mesh number of the screen is 50-100 meshes.
In a further technical scheme, in the bleaching step, the temperature of the deslagging paper pulp is controlled to be 40-45 ℃.
In a further technical scheme, in the adhesive mixing step, the pneumatic stirring machine is a paddle type stirring machine, the paddle type stirring machine comprises at least one paddle, the atomizing spray head is rotatably mounted on the upper portion of the paddle, and the atomizing spray head and the paddle are in coaxial and reverse rotating fit so as to achieve full combination of the adhesive and the waste paper fibers.
In a further aspect, in the binder mixing step, the binder contains 0.1% to 0.3% of carboxymethyl cellulose (CMC). The adhesive ability of the adhesive can be enhanced.
In a further technical scheme, in the step of oscillating and drying the fibers, the heat source preferably uses sunlight, or a heating lamp or a heating tube can be selected as the heat source, and the sunlight is used as the drying heat source, so that the production cost can be further saved.
In a further technical scheme, after the first high-concentration hydraulic pulping step, a sludge and sewage treatment step is performed, wherein heavy slag is discharged from the bottom of a high-concentration hydraulic pulper, sewage and sludge in the heavy slag are separated by a sludge-water separation device, the sludge is conveyed to a sludge drying treatment device for drying treatment, the dried sludge is conveyed to a power station for incineration, residual fibers in the sludge are fully combusted and converted into heat energy or electric energy, sludge incineration products are used as crop fertilizers, the sewage is conveyed to a sewage purification treatment device for purification treatment, and purified circulating water is conveyed to the high-concentration hydraulic pulper to realize zero discharge of the sewage and water for paper recycling, so that the problem of water consumption in the production link with the largest water consumption in the papermaking process is solved, and the method is clean and environment-friendly.
Compared with the prior art, the invention has the advantages that:
the invention uses the roughly selected waste paper material to produce the corrugated medium paper, simplifies the production steps of the regenerated corrugated medium paper, reduces the pollution to the environment, improves the paper performance and reduces the production cost;
the composite biological enzyme promotes the activation separation of the printing ink, reduces the using amount of the deinking agent, lightens the sewage treatment pressure, reduces the production cost and improves the whiteness of the fiber;
after the first high-concentration hydrapulper step is finished, inert gas is added into a pulping cylinder of the high-concentration hydrapulper, and oxygen in the pulping cylinder is squeezed away to avoid fiber yellowing;
according to the invention, the paper material is dried by oscillating and heating, so that the drying efficiency is improved, the energy consumption is reduced, the paper material drying effect is further optimized, the adhesive attached to the waste paper fiber is more uniformly activated, and the quality of paper is further improved.
According to the process, the dried sludge is sent to a power station for incineration, residual fibers in the sludge are fully combusted and converted into heat energy or electric energy, the sludge incineration product is used as crop fertilizer, the sewage is conveyed to a sewage purification treatment device for purification treatment, and the purified circulating water is conveyed to a first pulping device, so that zero discharge of the sewage is realized, the water for paper shredding is recycled, the problem of water consumption in the production link with the largest water consumption in the papermaking process is solved, and the process is clean and environment-friendly.
Detailed Description
The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention.
A method for reconstructing corrugated medium paper by using waste paper comprises the following steps:
1) a pulping step, comprising the following substeps:
1.1) a first high-consistency hydraulic pulping step,
putting waste paper, a deinking agent and a compound biological enzyme into a high-concentration hydrapulper for carrying out first high-concentration hydrapulped, wherein the compound biological enzyme comprises cellulase, hemicellulase, lipase and lipase, the percentage ratio of the cellulase to the hemicellulase to the lipase is 1:1:1.5, the pulping temperature is controlled to be 45 ℃, and the pulping time is 7min, so that first waste paper pulp is obtained, wherein the waste paper is high-quality waste newspaper or waste corrugated core paper, the addition amount of the deinking agent is 1% of the dry weight of the waste paper, the deinking agent is preferably a neutral deinking agent with the concentration of 30%, and the addition amount of the compound biological enzyme is 0.5% of the dry weight of the waste paper. The binding points between the ink and the fibers have larger stress, the compound biological enzyme acts on the areas preferentially, the compound biological enzyme can release a plurality of viscous half-saturated acidic substances, the half-saturated acidic substances have better intermiscibility with the ink, and have no affinity and intermiscibility with the fibers, and the half-saturated acidic substances permeate into the fibers of the waste paper, so that the connection between the ink and the fibers becomes loose;
1.2) standing, namely stopping the high-concentration hydrapulper after the first high-concentration hydrapulper is finished, adding inert gas into a pulping cylinder of the high-concentration hydrapulper, closing the pulping cylinder after the pulping cylinder is filled with the inert gas, standing the first waste paper pulp in the pulping cylinder for 30min, controlling the temperature of the first waste paper pulp to be 45 ℃, and extruding air in the pulping cylinder to prevent oxidation reaction of waste paper fibers during standing to cause yellowing;
1.3) a second high-concentration hydraulic pulping step, wherein after the standing step is finished, a high-concentration hydraulic pulper is started to carry out second high-concentration hydraulic pulping on the first waste paper pulp, the temperature of the first waste paper pulp is controlled to be 55 ℃, and the pulping time is 8min, so that second waste paper pulp is obtained;
in the process of pulping in water, the printing ink in the waste paper fiber is activated, so that the process steps are simplified, and the deinking rate is improved.
1.4) sludge and sewage treatment, wherein heavy slag is discharged from the bottom of a high-concentration hydrapulper, sewage and sludge in the heavy slag are separated by a sludge-water separation device, the sludge is conveyed to a sludge drying treatment device for drying treatment, the dried sludge is conveyed to a power station for burning, residual fibers in the sludge are fully burned and converted into heat energy or electric energy, sludge burning products are used as crop fertilizers, the sewage is conveyed to a sewage purification treatment device for purification treatment, and the purified circulating water is conveyed to the high-concentration hydrapulper, so that zero discharge of the sewage is realized, the water for circulating paper is recycled, the problem of water consumption in the production link with the largest water consumption in the papermaking process is solved, and the device is clean and environment-friendly. 2) And a high-concentration deslagging step, namely conveying the second waste paper pulp to a high-concentration deslagging device for high-concentration deslagging to obtain deslagging paper pulp.
3)Bleaching, adjusting the concentration of the pulp to 12%, sending to a bleaching tank, adding composite bleaching powder, and stirring to obtain bleached pulp, wherein the addition amount of the composite bleaching powder is 0.8kg/m3The first deslagging slurry, the composite bleaching powder comprises calcium hypochlorite and sodium percarbonate, the content of the calcium hypochlorite is 45%, the specific gravity of the calcium hypochlorite and the sodium percarbonate is 3:1, the stirring speed is 350rpm, the stirring time is 30min, and the temperature of deslagging paper pulp is controlled to be 42 ℃; the residual impurities in the deslagging paper pulp are bleached and used as the paper making filler, so that the production steps are simplified, the paper performance is improved, and the production cost is reduced.
4) A concentration and filtration step, namely delivering the bleached pulp to a vibrating screen for concentration and filtration to obtain concentrated paper stock, wherein the mesh number of the screen is 160 meshes, and the vibration frequency of the vibrating screen is 16 KHZ;
5) a centrifugal dehydration step, namely delivering the concentrated paper stock to a centrifugal dehydration device for dehydration to obtain dehydrated paper stock with the water content of 8 percent, wherein a dehydration cylinder of the centrifugal dehydration device is provided with a screen, the mesh number of the screen is 350 meshes, the dehydration rotating speed of the centrifugal dehydration device is 1000rpm, and the operation time of the centrifugal dehydration device is 20 min;
6) adhesive mixing step, send the dewatered pulp to the pneumatic mixer and mix the adhesive, make the adhesive depend on the waste paper fiber evenly, the pneumatic mixer chooses the paddle mixer for use, the paddle mixer includes a paddle and an atomizer, the atomizer is installed in the upper portion of the paddle rotatably, the atomizer cooperates with coaxial counter-rotation with the paddle, in order to realize the adhesive and the waste paper fiber carry on the abundant combination, the adhesive mixing step includes the following substep:
6.1) firstly, operating a pneumatic stirrer for 2min to break up the dehydrated paper;
6.2) then spraying a bonding agent containing 0.15 percent of carboxymethyl cellulose (CMC) on the dehydrated paper stock through an atomizing nozzle, wherein the atomizing nozzle continuously sprays for 10 seconds, and the adding amount of the bonding agent is 35ml/kg of dehydrated paper pulp, and the carboxymethyl cellulose (CMC) has the function of enhancing the bonding capability of the bonding agent;
6.3) finally, continuing to operate the pneumatic stirrer for 4min to realize the uniform mixing of the dewatered paper pulp and the adhesive to obtain the paper stock before pressing;
7) oscillating and drying the fibers, namely conveying the pre-pressed paper to an oscillating and drying device for further drying and dehydration, and activating an adhesive uniformly attached to the waste paper fibers, wherein the oscillating and drying device comprises an oscillating and conveying chain and a heat source, the heat source covers the oscillating and conveying chain, a plurality of trays for placing the pre-pressed paper and at least one track are arranged in the oscillating and conveying chain, the trays move on the track, the track is provided with a wave part, when the trays move on the track, the bottom of the trays and the wave part of the track are in abutting fit, so that the pre-pressed paper placed on the trays oscillates in the heating process, and the water content of the pre-pressed paper is reduced to 7%;
8) and a step of pressing paper, namely putting the paper material before pressing after the step of oscillating and drying the fibers into a paper pressing machine for rolling to obtain a paper roll, wherein a heating roller is arranged in the paper pressing machine, and pressing the paper material before pressing into paper through the heating roller, and the pressing temperature of the heating roller is 200 ℃.
The present embodiment also provides a method for treating wastewater generated in the high concentration deslagging step:
in the high-concentration deslagging step, wastewater discharged by the high-concentration deslagging device is filtered through a coarse screening device, the coarse screening device is provided with a screen with the mesh number of 80 meshes, then the filtered wastewater is sent to a wastewater tank for standing and precipitation, and the wastewater can be used for participating in the pulping step after the standing and precipitation for at least 5 hours. In the invention, the wastewater discharged by the high-concentration deslagging device still contains the deinking agent and the compound biological enzyme, but the wastewater can be secondarily utilized only by standing and precipitating because a large amount of separated ink particles exist in the wastewater.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (8)

1. A method for reconstructing corrugated medium paper by using waste paper is characterized by comprising the following steps:
1) a pulping step, comprising the following substeps:
1.1) a first high-concentration hydraulic pulping step, namely putting waste paper, a deinking agent and a compound biological enzyme into a high-concentration hydraulic pulper for carrying out first high-concentration hydraulic pulping, wherein the compound biological enzyme comprises cellulase, hemicellulase, lipase and lipase, the part ratio of the cellulase to the hemicellulase to the lipase is 1-1.5: 1-1.8: 1-1.9: 1.5-2.5, the pulping temperature is controlled to be 40-65 ℃, and the pulping time is 5-10 min, so as to obtain first waste paper pulp, wherein the waste paper is high-quality waste newspaper or waste corrugated core paper, the deinking agent is 0.1-1.8% of the dry weight of the waste paper, the deinking agent is a neutral deinking agent with the concentration of 30-45%, and the compound biological enzyme is 0.1-0.8% of the dry weight of the waste paper;
1.2) standing, namely stopping the high-concentration hydrapulper after the first high-concentration hydrapulper is finished, adding inert gas into a pulping cylinder of the high-concentration hydrapulper, wherein the inert gas is carbon dioxide or nitrogen, closing the pulping cylinder after the pulping cylinder is filled with the inert gas, standing the first waste paper pulp in the pulping cylinder for 20-45 min, and controlling the temperature of the first waste paper pulp to be 40-65 ℃;
1.3) a second high-concentration hydraulic pulping step, wherein after the standing step is finished, a high-concentration hydraulic pulper is started to carry out second high-concentration hydraulic pulping on the first waste paper pulp, the temperature of the first waste paper pulp is controlled to be 50-70 ℃, and the pulping time is 5-10 min, so that second waste paper pulp is obtained;
2) a high-concentration deslagging step, namely conveying the second waste paper pulp to a high-concentration deslagging device for high-concentration deslagging to obtain deslagging paper pulp;
3) bleaching, namely adjusting the concentration of the pulp subjected to deslagging to 10-15%, sending the pulp to a bleaching tank, adding composite bleaching powder, and uniformly stirring to obtain bleached pulp, wherein the adding amount of the composite bleaching powder is 0.5-2 kg/m3The first deslagging slurry, the composite bleaching powder comprises calcium hypochlorite and sodium percarbonate, the content of the calcium hypochlorite is 40-60%, the specific gravity of the calcium hypochlorite and the sodium percarbonate is 3:1, the stirring speed is 250-400 rpm,stirring for 20-45 min;
4) a concentration and filtration step, namely delivering the bleached paper pulp to a vibrating screen for concentration and filtration to obtain concentrated paper stock, wherein the mesh number of the screen is 140-230 meshes, and the oscillation frequency of the vibrating screen is 15-20 k Hz;
5) a centrifugal dehydration step, namely delivering the concentrated paper material to a centrifugal dehydration device for dehydration to obtain dehydrated paper material with the water content of 5-10%, wherein a dehydration cylinder of the centrifugal dehydration device is provided with a screen mesh, the mesh number of the screen mesh is 250-400 meshes, the dehydration rotation speed of the centrifugal dehydration device is 800-1500 rpm, and the operation time of the centrifugal dehydration device is 15-35 min;
6) adhesive mixing step, sending the dewatered pulp to a pneumatic mixer for adhesive mixing, so that the adhesive is uniformly attached to the waste paper fiber, wherein an atomizing nozzle is arranged in the pneumatic mixer, and the adhesive mixing step comprises the following substeps:
6.1) firstly, operating a pneumatic stirrer for 1-3 min to break up the dehydrated paper material;
6.2) then, spraying the adhesive on the dehydrated paper stock through an atomizing nozzle, wherein the atomizing nozzle continuously sprays the adhesive for 5-10 seconds, and the adding amount of the adhesive is 20-40 ml/kg of dehydrated paper pulp;
6.3) finally, continuing to operate the pneumatic stirrer for 2-5 min to realize uniform mixing of the dewatered paper pulp and the adhesive to obtain a paper material before pressing;
7) oscillating and drying the fibers, namely conveying the pre-pressed paper to an oscillating and drying device for further drying and dehydration, and activating an adhesive uniformly attached to the waste paper fibers, wherein the oscillating and drying device comprises an oscillating and conveying chain and a heat source, the heat source covers the oscillating and conveying chain, a plurality of trays for placing the pre-pressed paper and at least one track are arranged in the oscillating and conveying chain, the trays move on the track, the track is provided with a wave part, when the trays move on the track, the bottom of each tray is in abutting fit with the wave part of the track, so that the pre-pressed paper placed on the tray oscillates in the heating process, and the water content of the pre-pressed paper is reduced to 4-8%;
8) and a step of pressing paper, namely putting the paper material before pressing after the step of oscillating and drying the fibers into a paper pressing machine for rolling to obtain a paper roll, wherein a heating roller is arranged in the paper pressing machine, and pressing the paper material before pressing into paper through the heating roller, and the pressing temperature of the heating roller is 150-250 ℃.
2. The method of claim 1, wherein the waste paper is used for reconstructing corrugated medium paper, the method comprising the steps of: and in the high-concentration deslagging step, filtering the wastewater discharged by the high-concentration deslagging device through a coarse screening device, then sending the filtered wastewater to a wastewater tank for standing and precipitating, and only after standing and precipitating for at least 5 hours, using the wastewater to participate in the pulping step.
3. The method of claim 2, wherein the waste paper is used for reconstructing corrugated medium paper, the method comprising the steps of: the coarse screening device is provided with a screen, and the mesh number of the screen is 50-100 meshes.
4. A method of reconstructing corrugated medium paper using waste paper according to claim 3, wherein: in the bleaching step, the temperature of the deslagging paper pulp is controlled to be 40-45 ℃.
5. The method of claim 4, wherein the waste paper is used for reconstructing corrugated medium paper, the method comprising the steps of: in the adhesive mixing step, the pneumatic stirrer is a paddle stirrer, the paddle stirrer comprises at least one paddle, the atomizing nozzle is rotatably mounted at the upper part of the paddle, and the atomizing nozzle and the paddle are coaxially and reversely matched in a rotating mode.
6. The method of claim 5, wherein the waste paper is used for reconstructing corrugated medium paper, the method comprising the steps of: in the binder mixing step, the binder contains 0.1% to 0.3% of carboxymethyl cellulose (CMC).
7. The method of claim 6, wherein the waste paper is used for reconstructing corrugated medium paper, and the method comprises the following steps: in the step of oscillating and drying the fiber, the heat source uses sunlight, and a heating lamp or a heating tube can be selected as the heat source.
8. The method of claim 6, wherein the waste paper is used for reconstructing corrugated medium paper, and the method comprises the following steps: and a sludge and sewage treatment step is arranged after the first high-concentration hydraulic pulping step, heavy slag is discharged from the bottom of the high-concentration hydraulic pulper, sewage and sludge in the heavy slag are separated by a sludge-water separation device, the sludge is conveyed to a sludge drying treatment device for drying treatment, the dried sludge is conveyed to a power station for incineration, residual fibers in the sludge are fully combusted, the sewage is conveyed to a sewage purification treatment device for purification treatment, and the purified circulating water is conveyed to the high-concentration hydraulic pulper.
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