CN108660831B - Method for producing paper pulp for producing corrugated medium paper - Google Patents
Method for producing paper pulp for producing corrugated medium paper Download PDFInfo
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- CN108660831B CN108660831B CN201810280904.2A CN201810280904A CN108660831B CN 108660831 B CN108660831 B CN 108660831B CN 201810280904 A CN201810280904 A CN 201810280904A CN 108660831 B CN108660831 B CN 108660831B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
- D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
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- 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
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Abstract
The invention discloses a method for producing paper pulp for producing corrugated core paper, which comprises a pulping step, a coarse pulp preparation step, a microorganism decontamination step, a screening and purifying step, a flotation deinking step, a chelating pretreatment step, a sodium borohydride pretreatment step and a pulp preparation step.
Description
Technical Field
The invention relates to the technical field of paper making by using waste paper, in particular to a method for producing paper pulp for producing corrugated medium paper.
Background
In the prior art, low-quality waste paper and high-quality waste paper which are commonly adopted are mixed to prepare paper pulp, which needs a large amount of manpower to screen the types of the waste paper, in addition, a large amount of chemical agents are often used for processing the waste paper pulp in the process of preparing the paper pulp, which causes multiple chemical pollution to the waste paper pulp, and is difficult to be directly used for producing high-strength corrugated core paper, more processing steps are required in the production process, and the control link and the production cost are increased, so that improvement is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the method for producing the paper pulp for producing the corrugated medium paper, the pretreatment method can reduce the treatment steps of the low-quality waste paper under the condition of no classification, the low-quality waste paper is prepared into the paper pulp, the production process is clean and environment-friendly, no pollution is caused, waste is turned into wealth, and the environmental pollution is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for producing pulp for use in the production of corrugated medium paper, comprising the steps of,
1) and (3) disintegrating into pulp: putting low-quality waste paper serving as a waste paper raw material into a drum pulper, adding calcium carbonate into the drum pulper, wherein the weight input proportion of the calcium carbonate is that 1-5 kg of calcium carbonate is added into each ton of low-quality waste paper, and performing mild continuous disintegration under a high-concentration state to prepare raw pulp;
2) preparing coarse pulp: performing high-concentration impurity removal on the primary pulp prepared in the pulping step by adopting a primary two-section high-concentration slag remover, and then performing primary two-section coarse screening to prepare coarse pulp;
3) and (3) microorganism decontamination: pumping the coarse pulp into a fluidized bed reaction device through a spray pipe, spraying a microorganism treatment solution prepared by phycomycetes into the fluidized bed reaction device through a nozzle mouth arranged beside the spray pipe while pumping the coarse pulp through a pump pipe, naturally mixing the microorganism treatment solution into the coarse pulp, and spraying high-speed high-pressure air at the bottom of the fluidized bed reaction device for 4-12 hours to prepare the decontamination paper pulp;
4) screening and purifying: sequentially pumping the decontamination paper pulp to a high-concentration centrifugal sand remover, a first-stage four-section heavy sand remover and a first-stage three-section medium-concentration sieve to remove loose suspended particles in the decontamination paper pulp, carrying out coarse screening treatment on the decontamination paper pulp through the high-concentration centrifugal sand remover, carrying out purification treatment on the decontamination paper pulp through the first-stage four-section heavy sand remover, and carrying out purification treatment through the first-stage three-section medium-concentration sieve to prepare purified slurry;
5) flotation deinking step: pumping the purified pulp to a flotation tank, adding calcium oxalate into the flotation tank, performing flotation deinking treatment in the flotation tank, separating and floating ink in the purified pulp on the upper layer of the purified pulp, pumping the ink on the upper layer of the purified pulp through an oil pump, and removing residual ink in free purified pulp to obtain deinked pulp with the whiteness of 67-72% ISO;
6) pretreating sodium borohydride: pumping the waste paper pulp into a reaction tank for sodium borohydride pretreatment, controlling the concentration of the waste paper pulp to be 8-10 wt% before treatment, controlling the weight input proportion of sodium borohydride to be 10-15 kg of sodium borohydride per ton of waste paper pulp, controlling the pH value to be 9-10, heating the waste paper pulp by a heater arranged at the bottom of the tank, controlling the temperature of the waste paper pulp to be 75-85 ℃, and treating for 3-8 min to obtain pretreated slurry;
7) slurry preparation: pumping the pretreated slurry to a slurry preparation box, and preparing the slurry in the slurry preparation box, wherein the weight proportion of the slurry preparation is that 1-2 kg of fluorescent whitening agent, 3-5 kg of cationic starch, 3-5 kg of water repellent agent, 3-5 kg of high-purity polyaluminum chloride, 5-10 kg of bentonite, 3-5 kg of microparticle diatomite filter aid and 1-2 kg of adhesive control agent are added into each ton of the pretreated slurry, so that the paper pulp for producing the high-strength corrugated core paper is obtained.
Further, in the step of crushing into pulp, the concentration of the pulp of the primary pulp is adjusted to 3.5-4.5 wt%;
in the step of preparing the coarse pulp, a high-concentration slag separator selects a jump sieve with the aperture of a sieve pore of 2.0-4.0 mm, impurities with the particle size larger than the sieve pore are separated and removed in the slag separator, and the concentration of the coarse pulp is adjusted to be 60-70 wt%.
Furthermore, in the step of microbial decontamination, a fluidized bed reaction device with an open upper part and an aeration device arranged at the bottom and a large volume of 10 tons is selected, high-speed compressed air is sprayed in the step of microbial decontamination through the aeration device, the aeration duration is 1.5-3 hours, the reproduction rate of microorganisms is improved by using oxygen in the air, organic matters in the coarse pulp are decomposed into small molecular organic matters through microorganisms, the printing ink is decomposed into small molecular printing ink, and the small molecular organic matters and the small molecular printing ink are coagulated into loose suspended particles with the density of 0.7-0.75.
Further, in the step of removing the contaminants by the microorganisms, the microorganism treatment solution is obtained by the following steps including a microorganism culture step, specifically as follows:
a) preparing a fine pulp solution, selecting the raw pulp prepared in the step of crushing into pulp as a training raw material, removing impurities from the training raw material, rinsing, performing fine grinding treatment, and performing fine filtration treatment to obtain a fine pulp solution, wherein the concentration of the fine pulp solution is adjusted to 40-50 wt%;
b) culturing, namely placing the obtained fine pulp solution into an open container with the volume of 1-3 tons at the temperature of 25-35 ℃, adding 1-2 kg of thamnosphaera indica (L) into each ton of the fine pulp solution in a weight adding proportion, continuously and slowly spraying air from the bottom of the open container in the culturing process, wherein the air flow is 1L/min, slowly stirring by a stirrer, and culturing for 48-72 hours to obtain microorganism raw pulp;
c) performing biological modification, namely pumping the microorganism raw slurry to a biological modification bin, then injecting clear water, wherein the weight adding proportion of the clear water is that 10-20 tons of clear water is added into each ton of microorganism raw slurry to form diluted mixed solution, after the microorganism raw slurry is uniformly stirred and mixed, injecting high-pressure oxygen into the biological modification bin after the biological modification bin is sealed, keeping the pressure in the biological modification bin at 2-3 MPa, controlling the temperature in the biological modification bin at 35-45 ℃, continuously and slowly pumping phosphorus powder into the biological modification bin through a metering pump, wherein the pumping speed of the phosphorus powder is 1-3 g/min, stopping pumping the phosphorus powder after the continuous pumping is carried out for 24-36 hours, and uniformly dispersing transparent microspores generated by the erigeron pearskii in the diluted mixed solution;
injecting high-pressure oxygen into the biological modification bin after the pumping of the phosphorus powder is stopped to increase the pressure in the bin, reducing the air pressure in the bin through an air outlet at the top of the biological modification bin, enabling the pressure in the biological modification bin to fluctuate between 5-10 MPa, simultaneously starting a far infrared lamp tube in the biological modification bin, irradiating the diluted mixed liquid with far infrared light with the wavelength of 8-14 micrometers for 24-36 hours, enabling transparent microspores distributed in the diluted mixed liquid to generate hydroxylase under the comprehensive action of changing the pressure, the high-pressure oxygen and the far infrared light, and uniformly distributing the hydroxylase in the diluted mixed liquid to obtain the microbial treatment liquid.
After adopting the technical scheme, compared with the prior art, the invention has the advantages that:
1. the method creatively adopts the low-quality waste paper to replace high-quality and high-price recycled paper raw materials, does not need to optimize and match the raw materials, relies on advanced preparation equipment, and realizes the preparation of paper pulp by the low-quality waste paper by continuously optimizing the running performance of the equipment and selecting and using chemicals; meanwhile, the whiteness of the prepared slurry is improved to 90 percent of ISO whiteness from 80 percent; meanwhile, the strength meets the requirement of high-strength corrugated medium paper, and the method can be used for producing high-end high-strength corrugated medium paper.
2. The organic pollutants in the recovered waste paper are consumed as food by the microbes which are beneficial to culture, and can be decomposed into completely harmless substances for production and environment, and then the organic pollutants are separated from fibers in paper pulp through later-stage processes, so that the quality of the finally obtained paper pulp is obviously improved.
3. The method can effectively inhibit the quality decay of the waste paper fiber in the traditional bleaching process, so that the strength of the plant fiber is not greatly reduced after the plant fiber is recycled and bleached, the recycling frequency of the waste paper fiber can be improved, and huge social benefit, economic benefit and environmental benefit are brought.
Detailed Description
The following are merely preferred embodiments of the present invention, and do not limit the scope of the present invention.
A method for producing pulp for use in the production of corrugated medium paper, comprising the steps of,
1) and (3) disintegrating into pulp: the method comprises the steps of putting low-quality waste paper serving as a waste paper raw material into a drum pulper, adding calcium carbonate into the drum pulper, wherein the weight input proportion of the calcium carbonate is that 1-5 kg of calcium carbonate is added into each ton of low-quality waste paper, and performing mild continuous disintegration under a high-concentration state to obtain raw pulp, wherein the pulp concentration of the raw pulp is adjusted to 3.5-4.5 wt%.
2) Preparing coarse pulp: and (2) carrying out high-concentration impurity removal on the primary pulp prepared in the step of crushing into pulp by adopting a first-stage two-section high-concentration slag remover, separating and removing impurities with the particle size larger than the sieve pores in the slag remover by using a skip sieve with the sieve pore diameter of 2.0-4.0 mm in the high-concentration slag remover, and then preparing coarse pulp by using a first-stage two-section coarse sieve, wherein the concentration of the coarse pulp is adjusted to be 60-70 wt%.
3) And (3) microorganism decontamination:
the step needs to prepare a microbial treatment solution firstly, wherein the microbial treatment solution is obtained by the following microbial culture steps:
a) preparing a fine pulp solution, selecting the raw pulp prepared in the step of crushing into pulp as a training raw material, removing impurities from the training raw material, rinsing, performing fine grinding treatment, and performing fine filtration treatment to obtain the fine pulp solution, wherein the concentration of the fine pulp solution is adjusted to be 40-50 wt%.
b) And (2) culturing, namely placing the obtained fine pulp solution into an open container with the volume of 1-3 tons at the temperature of 25-35 ℃, wherein the weight adding proportion is that 1-2 kg of erigeron brevicaulis is added into each ton of fine pulp solution, continuously and slowly spraying air from the bottom of the open container in the culturing process, the ventilation amount is 1L/min, slowly stirring the mixture by a stirrer, and culturing for 48-72 hours.
c) And (2) performing biological modification, namely pumping the microorganism original slurry to a biological modification bin, then injecting clear water, wherein the weight adding proportion of the clear water is that 10-20 tons of clear water is added into each ton of microorganism original slurry to form diluted mixed solution, after the microorganism original slurry is uniformly stirred and mixed, injecting high-pressure oxygen into the biological modification bin after the biological modification bin is sealed, keeping the pressure in the biological modification bin at 2-3 MPa, controlling the temperature in the biological modification bin at 35-45 ℃, continuously and slowly pumping phosphorus powder into the biological modification bin through a metering pump, controlling the pumping speed of the phosphorus powder to be 1-3 g/min, stopping pumping the phosphorus powder after the continuous pumping is carried out for 24-36 hours, absorbing the phosphorus powder as nutrients by using pear head mildew, generating transparent microspores, and uniformly dispersing the transparent microspores generated by the pear head mildew in the diluted mixed solution.
Injecting high-pressure oxygen into the biological denaturation bin after stopping pumping the phosphorus powder to increase the pressure in the bin, reducing the pressure in the bin through an exhaust port at the top of the biological denaturation bin to enable the pressure in the biological denaturation bin to fluctuate between 5 and 10MPa, simultaneously starting a far infrared lamp tube in the biological denaturation bin, irradiating far infrared light with the wavelength of 8 to 14 micrometers on the diluted mixed solution for 24 to 36 hours, damaging partial outer membranes of the transparent microspores by infrared rays under the comprehensive action of the pressure change, the high-pressure oxygen and the far infrared light, leading the transparent microspores to generate different degrees of expansion or reduction under the action of the pressure change, leading the mutually contacted transparent microspores to be mutually fused and regenerated through outer membrane openings, leading the fused and regenerated transparent microspores to simultaneously generate hydroxylase during the regeneration process, and uniformly distributing the hydroxylase in the diluted mixed solution, obtaining the microorganism treatment liquid.
A microorganism decontamination step, wherein the coarse pulp is pumped into a fluidized bed reaction device through a spray pipe, while the coarse pulp is pumped by a pump pipe, a microorganism treatment liquid made of phycomycetes is sprayed into the fluidized bed reaction device through a nozzle arranged beside the spray pipe, the microorganism treatment liquid is naturally mixed in the coarse pulp, high-speed high-pressure air is sprayed at the bottom of the fluidized bed reaction device for 4-12 hours, the coarse pulp is stirred through the high-speed high-pressure air, the coarse pulp is rolled inside and outside, the regenerated transparent microspores and the hydroxylase are quickly dispersed and transferred in the coarse pulp, partial organic pollutants and printing ink are decomposed, and the regenerated transparent microspores and the hydroxylase can absorb partial organic pollutants as nutrients in the dispersing and transferring process of the regenerated transparent microspores and the hydroxylase so as to improve the activity of the transparent microspores and the hydroxylase in the internal microorganism treatment liquid, accelerating the propagation speed and decomposition speed of the microorganisms, completing the step of removing the pollutants by the microorganisms and preparing the pollution-removed paper pulp.
Preferably, a fluidized bed reaction device with an open upper part and an aeration device arranged at the bottom and a large volume of 10 tons is selected, high-speed compressed air is sprayed in the microorganism decontamination step through the aeration device, the aeration duration is 1.5-3 hours, the reproduction rate of microorganisms is improved by using oxygen in the air, organic matters in the coarse pulp are decomposed into small molecular organic matters through the microorganisms, the printing ink is decomposed into small molecular printing ink, and the small molecular organic matters and the small molecular printing ink are condensed into loose suspended particles with the density of 0.7-0.75. The invention adopts the microorganism to remove the pollution, can decompose the organic pollutants in the waste paper pulp by utilizing the microorganism treatment liquid, reduces the content of the pollutants in the wastewater water body in the later treatment period, reduces the influence on the environment, and has no pollution in the production process.
4) Screening and purifying: sequentially pumping the decontamination paper pulp to a high-concentration centrifugal sand remover, a first-stage four-section heavy sand remover and a first-stage three-section medium-concentration sieve to remove loose suspended particles in the decontamination paper pulp, carrying out coarse screening treatment on the decontamination paper pulp through the high-concentration centrifugal sand remover, carrying out purification treatment on the decontamination paper pulp through the first-stage four-section heavy sand remover, and carrying out purification treatment through the first-stage three-section medium-concentration sieve to prepare purified slurry;
5) flotation deinking step: pumping the purified pulp to a flotation tank, adding calcium oxalate into the flotation tank, performing flotation deinking treatment in the flotation tank, separating and floating ink in the purified pulp on the upper layer of the purified pulp, pumping the ink on the upper layer of the purified pulp through an oil pump, and removing residual ink in free purified pulp to obtain deinked pulp with the whiteness of 67-72% ISO.
6) Pretreating sodium borohydride: pumping the waste paper pulp into a reaction tank for sodium borohydride pretreatment, controlling the concentration of the waste paper pulp to be 8-10 wt% before treatment, controlling the weight input proportion of sodium borohydride to be 10-15 kg of sodium borohydride per ton of waste paper pulp, controlling the pH value to be 9-10, heating the waste paper pulp by a heater arranged at the bottom of the tank, controlling the temperature of the waste paper pulp to be 75-85 ℃, and treating for 3-8 min to obtain pretreated slurry;
7) slurry preparation: pumping the pretreated slurry to a slurry preparation box, and preparing the slurry in the slurry preparation box, wherein the weight proportion of the slurry preparation is that 1-2 kg of fluorescent whitening agent, 3-5 kg of cationic starch, 3-5 kg of water repellent agent, 3-5 kg of high-purity polyaluminum chloride, 5-10 kg of bentonite, 3-5 kg of microparticle diatomite filter aid and 1-2 kg of adhesive control agent are added into each ton of the pretreated slurry, so that the paper pulp for producing the high-strength corrugated core paper is obtained.
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 (2)
1. A method of producing pulp for use in the production of corrugated medium paper, the method comprising: comprises the following steps of (a) carrying out,
1) and (3) disintegrating into pulp: putting low-quality waste paper serving as a waste paper raw material into a drum pulper, adding calcium carbonate into the drum pulper, wherein the weight input proportion of the calcium carbonate is that 1-5 kg of calcium carbonate is added into each ton of low-quality waste paper, and performing mild continuous disintegration under a high-concentration state to prepare raw pulp;
2) preparing coarse pulp: performing high-concentration impurity removal on the primary pulp prepared in the pulping step by adopting a primary two-section high-concentration slag remover, and then performing primary two-section coarse screening to prepare coarse pulp;
3) and (3) microorganism decontamination: selecting fluidized bed reaction equipment with an open upper part and an aeration device arranged at the bottom, pumping the coarse pulp into the fluidized bed reaction equipment through a spray pipe, spraying microbial treatment liquid prepared by phycomycetes into the fluidized bed reaction equipment through a nozzle arranged beside the spray pipe while pumping the coarse pulp through a pump pipe, naturally mixing the microbial treatment liquid into the coarse pulp, spraying high-speed high-pressure air at the bottom of the fluidized bed reaction equipment for 4-12 hours to prepare the decontamination paper pulp,
in the step of microbial decontamination, high-speed compressed air is sprayed in through an aeration device, the aeration duration is 1.5-3 hours, the reproduction rate of microbes is improved by using oxygen in the air, organic matters in the coarse pulp are decomposed into micromolecular organic matters through the microbes, the printing ink is decomposed into micromolecular printing ink, and the micromolecular organic matters and the micromolecular printing ink are coagulated into loose suspended particles;
the microorganism treatment solution is obtained by the following steps including a microorganism culture step,
a) preparing a fine pulp solution, selecting the raw pulp prepared in the step of crushing into pulp as a training raw material, removing impurities from the training raw material, rinsing, performing fine grinding treatment, and performing fine filtration treatment to obtain a fine pulp solution, wherein the concentration of the fine pulp solution is adjusted to 40-50 wt%;
b) culturing, namely placing the obtained fine pulp solution into an open container with the volume of 1-3 tons at the temperature of 25-35 ℃, adding 1-2 kg of thamnosphaera indica (L) into each ton of the fine pulp solution in a weight adding proportion, continuously and slowly spraying air from the bottom of the open container in the culturing process, wherein the air flow is 1L/min, slowly stirring by a stirrer, and culturing for 48-72 hours to obtain microorganism raw pulp;
c) performing biological modification, namely pumping the microorganism raw slurry to a biological modification bin, then injecting clear water, wherein the weight adding proportion of the clear water is that 10-20 tons of clear water is added into each ton of microorganism raw slurry to form diluted mixed solution, after the microorganism raw slurry is uniformly stirred and mixed, injecting high-pressure oxygen into the biological modification bin after the biological modification bin is sealed, keeping the pressure in the biological modification bin at 2-3 MPa, controlling the temperature in the biological modification bin at 35-45 ℃, continuously and slowly pumping phosphorus powder into the biological modification bin through a metering pump, wherein the pumping speed of the phosphorus powder is 1-3 g/min, stopping pumping the phosphorus powder after the continuous pumping is carried out for 24-36 hours, and uniformly dispersing transparent microspores generated by the erigeron pearskii in the diluted mixed solution;
injecting high-pressure oxygen into the biological modification bin after pumping of phosphorus powder is stopped to increase the pressure in the bin, reducing the air pressure in the bin through an air outlet at the top of the biological modification bin, enabling the pressure in the biological modification bin to fluctuate between 5 and 10MPa, simultaneously starting a far infrared lamp tube in the biological modification bin, irradiating the diluted mixed solution with far infrared light with the wavelength of 8 to 14 micrometers for 24 to 36 hours, and enabling transparent microspores distributed in the diluted mixed solution to generate hydroxylase under the comprehensive action of the pressure change, the high-pressure oxygen and the far infrared light, wherein the hydroxylase is uniformly distributed in the diluted mixed solution to obtain a microbial treatment solution;
4) screening and purifying: sequentially pumping the decontamination paper pulp to a high-concentration centrifugal sand remover, a first-stage four-section heavy sand remover and a first-stage three-section medium-concentration sieve to remove loose suspended particles in the decontamination paper pulp, carrying out coarse screening treatment on the decontamination paper pulp through the high-concentration centrifugal sand remover, carrying out purification treatment on the decontamination paper pulp through the first-stage four-section heavy sand remover, and carrying out purification treatment through the first-stage three-section medium-concentration sieve to prepare purified slurry;
5) flotation deinking step: pumping the purified pulp to a flotation tank, adding calcium oxalate into the flotation tank, performing flotation deinking treatment in the flotation tank, separating and floating ink in the purified pulp on the upper layer of the purified pulp, pumping the ink on the upper layer of the purified pulp through an oil pump, and removing residual ink in free purified pulp to obtain deinked pulp with the whiteness of 67-72% ISO;
6) pretreating sodium borohydride: pumping the waste paper pulp into a reaction tank for sodium borohydride pretreatment, controlling the concentration of the waste paper pulp to be 8-10 wt% before treatment, controlling the weight input proportion of sodium borohydride to be 10-15 kg of sodium borohydride per ton of waste paper pulp, controlling the pH value to be 9-10, heating the waste paper pulp by a heater arranged at the bottom of the tank, controlling the temperature of the waste paper pulp to be 75-85 ℃, and treating for 3-8 min to obtain pretreated slurry;
7) slurry preparation: pumping the pretreated slurry to a slurry preparation box, and preparing the slurry in the slurry preparation box, wherein the weight proportion of the slurry preparation is that 1-2 kg of fluorescent whitening agent, 3-5 kg of cationic starch, 3-5 kg of water repellent agent, 3-5 kg of high-purity polyaluminum chloride, 5-10 kg of bentonite, 3-5 kg of microparticle diatomite filter aid and 1-2 kg of adhesive control agent are added into each ton of the pretreated slurry, so that the paper pulp for producing the high-strength corrugated core paper is obtained.
2. A method of producing pulp for use in the production of corrugated medium paper according to claim 1, wherein: in the step of crushing into pulp, the concentration of the pulp of the primary pulp is adjusted to 3.5-4.5 wt%;
in the step of preparing the coarse pulp, the high-concentration slag separator selects a jump sieve with the aperture of a sieve pore of 2.0-4.0 mm, impurities with the particle size larger than the sieve pore are separated and removed in the high-concentration slag separator, and the concentration of the coarse pulp is adjusted to be 60-70 wt%.
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| CN109629297B (en) * | 2018-12-17 | 2021-04-20 | 东莞顺裕纸业有限公司 | Corrugated medium paper production method capable of improving deinking efficiency |
| CN112663372B (en) * | 2020-12-25 | 2022-11-25 | 东莞顺裕纸业有限公司 | Production method for reducing pulping energy consumption by using waste paper to regenerate corrugated medium paper |
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