CN113622210B - Mortar mixing method for gray paperboard - Google Patents
Mortar mixing method for gray paperboard Download PDFInfo
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- CN113622210B CN113622210B CN202110969903.0A CN202110969903A CN113622210B CN 113622210 B CN113622210 B CN 113622210B CN 202110969903 A CN202110969903 A CN 202110969903A CN 113622210 B CN113622210 B CN 113622210B
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- 239000011087 paperboard Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003823 mortar mixing Methods 0.000 title description 2
- 239000002002 slurry Substances 0.000 claims abstract description 114
- 239000010802 sludge Substances 0.000 claims abstract description 57
- 238000002156 mixing Methods 0.000 claims abstract description 44
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 239000011111 cardboard Substances 0.000 claims abstract description 17
- 239000000123 paper Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 229920002522 Wood fibre Polymers 0.000 claims abstract description 7
- 239000002025 wood fiber Substances 0.000 claims abstract description 7
- 230000014759 maintenance of location Effects 0.000 claims description 43
- 239000000843 powder Substances 0.000 claims description 42
- 239000003795 chemical substances by application Substances 0.000 claims description 41
- 238000012216 screening Methods 0.000 claims description 38
- 229910021536 Zeolite Inorganic materials 0.000 claims description 33
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 33
- 239000010457 zeolite Substances 0.000 claims description 33
- 239000010410 layer Substances 0.000 claims description 26
- 239000011259 mixed solution Substances 0.000 claims description 26
- 238000004513 sizing Methods 0.000 claims description 22
- 239000002344 surface layer Substances 0.000 claims description 18
- 239000000047 product Substances 0.000 claims description 17
- 239000011256 inorganic filler Substances 0.000 claims description 16
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 16
- 150000001875 compounds Chemical class 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 14
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 14
- 238000004537 pulping Methods 0.000 claims description 13
- 229910021532 Calcite Inorganic materials 0.000 claims description 12
- 244000302661 Phyllostachys pubescens Species 0.000 claims description 12
- 235000003570 Phyllostachys pubescens Nutrition 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- 239000006228 supernatant Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000010790 dilution Methods 0.000 claims description 9
- 239000012895 dilution Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 239000012792 core layer Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 8
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 7
- 230000008719 thickening Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229920002472 Starch Polymers 0.000 claims description 4
- 125000002091 cationic group Chemical group 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 238000010411 cooking Methods 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000004094 preconcentration Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 230000000930 thermomechanical effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000835 fiber Substances 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005119 centrifugation Methods 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- -1 and the like Substances 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/061—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods using cutting devices
-
- 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
- D21C7/00—Digesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
-
- 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
-
- 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
-
- 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 relates to the technical field of papermaking, in particular to a pulp mixing method of a gray paperboard; the gray paperboard finished product prepared by the slurry provided by the invention not only can effectively improve the bulk, but also can further improve the folding endurance and other mechanical properties; the quality of the product is effectively improved; meanwhile, the prepared gray paperboard has the advantages of good smoothness and flatness and difficult deformation; meanwhile, the product has the characteristics of good stiffness, bending resistance and the like, and effectively ensures the quality of the gray paperboard; according to the invention, the waste domestic cardboard paper, the waste newspaper, the waste wood fiber raw material and the papermaking sludge are used as raw materials for preparing the gray cardboard slurry, so that the bonding strength between the slurry layers is improved, the fiber usage amount is saved, and the reutilization of waste resources is realized; not only saves the production cost, but also protects the environment and realizes the green and environment-friendly production.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a pulp mixing method of a gray paperboard.
Background
In recent years, with the rapid development of economy in China, the traffic of various commodities is increasing, and the demand for paper-making products keeps increasing by two digits each year. The gray paperboard is an industrial thick paperboard which is used as a base material for being manufactured into products such as book covers, gift boxes, wine, cosmetic and other commodity packaging boxes in the packaging and printing industries.
Because the gray paperboard has the characteristics of higher thickness, smaller tightness, lower quality requirement on raw materials, and the like, waste paper, semi-bleached pulp, semi-chemical pulp and the like can be used. So it is favored in the field of commodity packaging boxes. Moreover, the demand for gray paperboard in the field of commodity packaging boxes tends to increase year by year. In the process of producing gray paperboard, the pulp preparation is an indispensable intermediate stage. When the sizing agent prepared by the existing working procedure is used for preparing the gray paperboard product, although the sizing agent can meet the requirements of the commodity packaging field, the sizing agent is relatively poor in smoothness and flatness, and the mechanical property of the sizing agent needs to be further improved, so that the quality and selling of the gray paperboard are affected to a certain extent.
Therefore, providing a pulp mixing method for gray cardboard is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a pulp mixing method for gray paperboard, and the pulp provided by the invention is used as a raw material for preparing the gray paperboard, so that the prepared gray paperboard has the characteristics of good bulk, smoothness, good flatness, good bending resistance and good mechanical property. In addition, the invention takes the waste domestic cardboard paper, the waste newspaper, the waste wood fiber raw material and the papermaking sludge as raw materials for preparing the gray cardboard slurry, thereby improving the bonding strength between the slurry layers, saving the fiber usage amount and realizing the reutilization of waste resources; not only saves the production cost, but also protects the environment and realizes the green and environment-friendly production.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for pulping gray paperboard, comprising the steps of:
step one, pulping;
firstly, sequentially carrying out the procedures of crushing, deslagging, screening, concentrating, refining and storing on waste domestic cardboard paper recycled from the market, and finally marking the prepared slurry as first slurry;
II, sequentially carrying out the procedures of crushing, deslagging, screening, concentrating, heat dispersing and storing on waste newspapers recycled from the market, and finally marking the obtained pulp as second pulp;
III, sequentially performing chipping and crushing, metal removal, steam cooking, thermomechanical disintegration, de-submerging and concentration adjustment, heavy impurity removal, screening and concentration and high-concentration pulping treatment on the waste wood fiber raw material, and marking the obtained product as third slurry;
IV, concentrating the concentration of the papermaking sludge to 2.5-3.5% by a pre-concentration machine, and then conveying the concentrated papermaking sludge to a high-concentration slag remover for slag removal treatment; the obtained papermaking sludge with the concentration of 2 to 2.5 percent is subjected to coarse screening treatment; adding proper amounts of a compound retention aid, an inorganic filler and a sludge wrapping agent into the mixture respectively, and mechanically and uniformly mixing to obtain papermaking sludge slurry;
step two, pulp preparation;
concentrating the obtained second slurry in a surface layer mixing tank and a surface layer pre-copying tank, diluting the second slurry in a surface layer flow part, screening before screening, and removing surface layer flow box to perform slurry distribution and net surfing; taking the material as a gray paperboard surface layer sizing agent; wherein the gray paperboard surface layer slurry accounts for 20% of the total slurry;
the weight ratio is 1:1.3 to 1.8, pumping the first slurry and the third slurry into a lining mixing tank and a pre-shoveling tank for mixing and thickening; then pumping the obtained slurry to a lining flow-out part for dilution and screening before screening, and removing the lining layer of the paper machine to perform slurry distribution and screening in a slurry box; as a gray paperboard liner slurry; wherein the gray paperboard lining slurry accounts for 20% of the total slurry;
the first sizing agent, the third sizing agent and the papermaking sludge sizing agent are mixed according to the weight ratio of 1:1.2 to 1.5: pumping 0.6-0.9 to a core layer mixing tank and a pre-papermaking tank for mixing and concentration adjustment, and conveying the slurry after mixing and concentration adjustment to a core layer flow conveying part for dilution and screening before net; the liner layer of the paper removing machine is spread into pulp and is screened by a pulp box, and the pulp is used as gray paper board core pulp; wherein the gray cardboard core slurry accounts for 40% of the total slurry;
the first sizing agent and the third sizing agent are mixed according to the weight ratio of 1: 1-1.5 pumping a bottom layer mixing tank and a pre-papermaking tank for mixing and concentrating, feeding the mixed and concentrated slurry into a bottom layer flow part for dilution and screening before screening, and feeding the slurry into a paper machine substrate layer slurry box for slurry distribution and screening, wherein the slurry is used as a bottom layer slurry of a gray paperboard; wherein the gray paperboard bottom layer slurry accounts for 20% of the total slurry.
Further, the compound retention aid used in the step IV is prepared from an inorganic retention aid and an organic retention aid according to the mass ratio of 1.5-2.0: 1, mixing and preparing; and the dosage of the compound retention aid is 0.3-0.5 kg/t papermaking sludge.
Further, the preparation method of the inorganic retention aid comprises the following steps: immersing zeolite micro powder in the mixed solution for 2-4 h; filtering out zeolite micropowder, and washing the zeolite micropowder with deionized water; then adopting a centrifugal machine to carry out centrifugal treatment, pouring out supernatant fluid, and repeatedly cleaning the supernatant fluid until no white precipitate is generated by using sodium chloride solution for inspection; and then drying and grinding the zeolite micro powder after the washing treatment to 500-700 meshes to obtain the finished product of the inorganic retention aid.
Further, the particle size of the zeolite micro powder is 80-150 meshes, and the dosage ratio of the zeolite micro powder to the mixed solution is 0.06-0.12 g/mL.
Further, the preparation method of the mixed solution comprises the following steps: adding 6-10% of 2-methyl-4-isothiazolin-3-ketone into 0.15-0.32 mol/L silver nitrate solution, and uniformly mixing and stirring to obtain the mixed solution finished product.
Further, the centrifugal speed of the centrifugal machine is set to 3000-4000 r/min, and the centrifugal treatment time is set to 20-30 min.
Further, the organic retention aid is selected from any one of polyacrylamide and cationic starch.
Further, the inorganic filler is prepared from calcite powder and moso bamboo powder according to a mass ratio of 1: 2-3, mixing and preparing the mixture; the particle size of the calcite powder and the moso bamboo powder is 400-500 meshes; and the dosage of the inorganic filler is 8-10% of the papermaking sludge.
Further, the dosage of the sludge wrapping agent is 0.35-0.48% of the papermaking sludge; and the sludge wrapping agent is any one of a sludge wrapping agent CHAMPRO-AP1080 and a sludge wrapping agent JHWB-1319.
Further, the temperature of the mixed solution is 65-80 ℃, and the pH value is adjusted to 6.5-7.8.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the waste domestic cardboard paper, the waste newspaper, the waste wood fiber raw material and the papermaking sludge are used as raw materials for preparing the gray cardboard slurry, so that the bonding strength between the slurry layers is improved, the fiber usage amount is saved, and the reutilization of waste resources is realized; not only saves the production cost, but also protects the environment and realizes the green and environment-friendly production. Furthermore, the gray paperboard finished product prepared by the slurry provided by the invention not only can effectively improve the bulk, but also can further improve the folding endurance and other mechanical properties; effectively improving the quality.
2. The invention uses zeolite micropowder, silver nitrate and 2-methyl-4-isothiazolin-3-ketone as raw materials for preparing inorganic retention aid, and the zeolite micropowder, the silver nitrate and the 2-methyl-4-isothiazolin-3-ketone are mutually compatible with organic retention aid to prepare the compound retention aid. The obtained compound retention aid, inorganic filler (calcite powder and phyllostachys pubescens powder) and sludge wrapping agent are used as raw materials of the prepared gray paperboard slurry, which is beneficial to interaction between papermaking sludge and fiber components in the slurry, effectively adjusts the distribution characteristic of the papermaking sludge in a paper web network structure and enhances the bonding strength of a hydrogen bond structure. Furthermore, the prepared gray paperboard has the advantages of good smoothness and flatness and difficult deformation. Meanwhile, the novel gray paperboard has the characteristics of good stiffness, bending resistance and the like, and the quality of gray paperboard is effectively ensured.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A method for pulping gray paperboard, comprising the steps of:
step one, pulping;
firstly, sequentially carrying out the procedures of crushing, deslagging, screening, concentrating, refining and storing on waste domestic cardboard paper recycled from the market, and finally marking the prepared slurry as first slurry;
II, sequentially carrying out the procedures of crushing, deslagging, screening, concentrating, heat dispersing and storing on waste newspapers recycled from the market, and finally marking the obtained pulp as second pulp;
III, sequentially performing chipping and crushing, metal removal, steam cooking, thermomechanical disintegration, de-submerging and concentration adjustment, heavy impurity removal, screening and concentration and high-concentration pulping treatment on the waste wood fiber raw material, and marking the obtained product as third slurry;
IV, concentrating the concentration of the papermaking sludge to 2.5% by a pre-concentration machine, and then conveying the concentrated papermaking sludge to a high-concentration slag remover for slag removal treatment; the papermaking sludge with the concentration of 2 percent is treated by a coarse screen; adding proper amounts of a compound retention aid, an inorganic filler and a sludge wrapping agent into the mixture respectively, and mechanically and uniformly mixing to obtain papermaking sludge slurry;
step two, pulp preparation;
concentrating the obtained second slurry in a surface layer mixing tank and a surface layer pre-copying tank, diluting the second slurry in a surface layer flow part, screening before screening, and removing surface layer flow box to perform slurry distribution and net surfing; taking the material as a gray paperboard surface layer sizing agent; wherein the gray paperboard surface layer slurry accounts for 20% of the total slurry;
the weight ratio is 1:1.3, pumping the first slurry and the third slurry into a lining mixing tank and a pre-shoveling tank for mixing and thickening; then pumping the obtained slurry to a lining flow-out part for dilution and screening before screening, and removing the lining layer of the paper machine to perform slurry distribution and screening in a slurry box; as a gray paperboard liner slurry; wherein the gray paperboard lining slurry accounts for 20% of the total slurry;
the first sizing agent, the third sizing agent and the papermaking sludge sizing agent are mixed according to the weight ratio of 1:1.2: pumping the slurry to a core layer mixing tank and a pre-copying tank for mixing and thickening, and conveying the slurry to a core layer flow conveying part for dilution and screening before net; the liner layer of the paper removing machine is spread into pulp and is screened by a pulp box, and the pulp is used as gray paper board core pulp; wherein the gray cardboard core pulp accounts for 40% of the total amount of the pulp;
the first sizing agent and the third sizing agent are mixed according to the weight ratio of 1:1, pumping a bottom layer mixing tank and a pre-papermaking tank for mixing and thickening, conveying the mixed and thickened slurry to a bottom layer flow part for dilution and screening before screening, and arranging slurry to a paper machine substrate layer slurry box for screening, wherein the slurry is used as a gray paperboard bottom layer slurry; wherein the gray paperboard bottom layer slurry accounts for 20% of the total slurry.
The compound retention aid used in the step IV is prepared from an inorganic retention aid and an organic retention aid according to the mass ratio of 1.5:1, mixing and preparing; and the dosage of the compound retention aid is 0.3kg/t papermaking sludge.
The preparation method of the inorganic retention aid comprises the following steps: immersing zeolite micropowder in the mixed solution for 2h; filtering out zeolite micropowder, and washing the zeolite micropowder with deionized water; then adopting a centrifugal machine to carry out centrifugal treatment, pouring out supernatant fluid, and repeatedly cleaning the supernatant fluid until no white precipitate is generated by using sodium chloride solution for inspection; and drying and grinding the zeolite micro powder after the washing treatment to 500 meshes to obtain the finished inorganic retention aid product.
The particle size of the zeolite micro powder is 80 meshes, and the dosage ratio of the zeolite micro powder to the mixed solution is 0.06g/mL.
The preparation method of the mixed solution comprises the following steps: adding 6% of 2-methyl-4-isothiazolin-3-ketone into 0.15mol/L silver nitrate solution, and uniformly mixing and stirring to obtain the mixed solution finished product.
The centrifuge speed was set at 3000r/min and the time of the centrifugation was set at 20min.
The organic retention aid is polyacrylamide.
The inorganic filler is prepared from calcite powder and moso bamboo powder according to the mass ratio of 1:2, mixing and preparing; the particle size of calcite powder and moso bamboo powder is 400 meshes; and the dosage of the inorganic filler is 8 percent of the papermaking sludge.
The dosage of the sludge wrapping agent is 0.35% of the papermaking sludge; and the sludge wrapping agent is CHAMPLO-AP 1080.
The temperature of the mixed solution was 65℃and the pH thereof was adjusted to 6.5.
Example 2
The main differences between this embodiment and embodiment 1 are:
in the gray paperboard lining slurry, the weight ratio of the first slurry to the third slurry is 1:1.5;
in the gray paperboard core slurry, the weight ratio of the first slurry to the third slurry to the papermaking sludge slurry is 1:1.4:0.8;
in the bottom layer slurry of the gray paperboard, the weight ratio of the first slurry to the third slurry is 1:1.3.
the compound retention aid used in the step IV is prepared from an inorganic retention aid and an organic retention aid according to the mass ratio of 1.8:1, mixing and preparing; and the dosage of the compound retention aid is 0.4kg/t papermaking sludge.
The preparation method of the inorganic retention aid comprises the following steps: immersing zeolite micropowder in the mixed solution for 3h; filtering out zeolite micropowder, and washing the zeolite micropowder with deionized water; then adopting a centrifugal machine to carry out centrifugal treatment, pouring out supernatant fluid, and repeatedly cleaning the supernatant fluid until no white precipitate is generated by using sodium chloride solution for inspection; and drying and grinding the zeolite micro powder after the washing treatment to 600 meshes to obtain the finished inorganic retention aid product.
The particle size of the zeolite micro powder is 100 meshes, and the dosage ratio of the zeolite micro powder to the mixed solution is 0.1g/mL.
The preparation method of the mixed solution comprises the following steps: adding 8% of 2-methyl-4-isothiazolin-3-ketone into 0.25mol/L silver nitrate solution, and uniformly mixing and stirring to obtain the mixed solution finished product.
The centrifuge centrifugation rate was set at 3500r/min and the centrifugation time was set at 25min.
The organic retention aid is cationic starch.
The inorganic filler is prepared from calcite powder and moso bamboo powder according to the mass ratio of 1:2.5, mixing and preparing; the particle size of calcite powder and moso bamboo powder is 450 meshes; and the dosage of the inorganic filler is 9 percent of the papermaking sludge.
The dosage of the sludge wrapping agent is 0.42% of the papermaking sludge; and the sludge wrapping agent is selected from a sludge wrapping agent JHWB-1319.
The temperature of the mixed solution was 75℃and the pH thereof was adjusted to 7.2.
Example 3
The main differences between this embodiment and embodiment 1 are:
in the gray paperboard lining slurry, the weight ratio of the first slurry to the third slurry is 1:1.8;
in the gray paperboard core slurry, the weight ratio of the first slurry to the third slurry to the papermaking sludge slurry is 1:1.5:0.9;
in the bottom layer slurry of the gray paperboard, the weight ratio of the first slurry to the third slurry is 1:1.5.
the compound retention aid used in the step IV is prepared from an inorganic retention aid and an organic retention aid according to a mass ratio of 2.0:1, mixing and preparing; and the dosage of the compound retention aid is 0.5kg/t papermaking sludge.
The preparation method of the inorganic retention aid comprises the following steps: immersing zeolite micro powder in the mixed solution for 4 hours; filtering out zeolite micropowder, and washing the zeolite micropowder with deionized water; then adopting a centrifugal machine to carry out centrifugal treatment, pouring out supernatant fluid, and repeatedly cleaning the supernatant fluid until no white precipitate is generated by using sodium chloride solution for inspection; and drying and grinding the zeolite micro powder after the washing treatment to 700 meshes to obtain the finished inorganic retention aid product.
The particle size of the zeolite micro powder is 150 meshes, and the dosage ratio of the zeolite micro powder to the mixed solution is 0.12g/mL.
The preparation method of the mixed solution comprises the following steps: adding 10% of 2-methyl-4-isothiazolin-3-ketone into 0.32mol/L silver nitrate solution, and uniformly mixing and stirring to obtain the mixed solution finished product.
The centrifuge centrifugation rate was set at 4000r/min and the centrifugation time was set at 30min.
The organic retention aid is selected from any one of polyacrylamide and cationic starch.
The inorganic filler is prepared from calcite powder and moso bamboo powder according to the mass ratio of 1:3, mixing and preparing; the particle size of calcite powder and moso bamboo powder is 500 meshes; and the dosage of the inorganic filler is 10 percent of the papermaking sludge.
The dosage of the sludge wrapping agent is 0.48% of the papermaking sludge; and the sludge wrapping agent is CHAMPLO-AP 1080.
The temperature of the mixed solution was 80℃and the pH thereof was adjusted to 7.8.
Comparative example 1: the main difference between this embodiment and embodiment 1 is that: the common zeolite with equal amount and similar size is selected to replace the inorganic retention aid;
comparative example 2: the main difference between this embodiment and embodiment 1 is that: only calcite powder is selected as the inorganic filler;
comparative example 3: the main difference between this embodiment and embodiment 1 is that: the inorganic filler is only moso bamboo powder;
performance testing
The gray cardboard sheets produced by examples 1 to 3 in the present invention were recorded as experimental examples 1 to 3; the gray paperboard produced in comparative examples 1 to 3 was recorded as a comparative example; then, the gray cardboard sheets provided in experimental examples 1 to 3 and comparative examples 1 to 3 were subjected to the relevant performance test, respectively, and the obtained data are recorded in the following table:
as can be seen from the related data in the table, the prepared gray paperboard has good bulk, smoothness, good flatness, good stiffness, good bending resistance and good mechanical properties by adopting the slurry provided by the invention as a raw material for preparing the gray paperboard. In addition, the invention takes the waste domestic cardboard paper, the waste newspaper, the waste wood fiber raw material and the papermaking sludge as raw materials for preparing the gray cardboard slurry, thereby improving the bonding strength between the slurry layers, saving the fiber usage amount and realizing the reutilization of waste resources. Not only saves the production cost, but also protects the environment and realizes the green and environment-friendly production. Therefore, the gray paperboard product produced by the invention has wider market prospect and is more suitable for popularization.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. A method for pulping gray paperboard, comprising the steps of:
step one, pulping;
firstly, sequentially carrying out the procedures of crushing, deslagging, screening, concentrating, refining and storing on waste domestic cardboard paper recycled from the market, and finally marking the prepared slurry as first slurry;
II, sequentially carrying out the procedures of crushing, deslagging, screening, concentrating, heat dispersing and storing on waste newspapers recycled from the market, and finally marking the obtained pulp as second pulp;
III, sequentially performing chipping and crushing, metal removal, steam cooking, thermomechanical disintegration, de-submerging and concentration adjustment, heavy impurity removal, screening and concentration and high-concentration pulping treatment on the waste wood fiber raw material, wherein the obtained pulp is recorded as third pulp;
IV, concentrating the concentration of the papermaking sludge to 2.5-3.5% by a pre-concentration machine, and then conveying the concentrated papermaking sludge to a high-concentration slag remover for slag removal treatment; the obtained papermaking sludge with the concentration of 2 to 2.5 percent is subjected to coarse screening treatment; adding proper amounts of a compound retention aid, an inorganic filler and a sludge wrapping agent into the mixture respectively, and mechanically and uniformly mixing to obtain slurry which is called as papermaking sludge slurry;
the inorganic filler is prepared from calcite powder and moso bamboo powder according to a mass ratio of 1: 2-3, mixing and preparing the mixture; the particle size of the calcite powder and the moso bamboo powder is 400-500 meshes; the dosage of the inorganic filler is 8-10% of the papermaking sludge;
the dosage of the sludge wrapping agent is 0.35-0.48% of the papermaking sludge; the sludge wrapping agent is any one of a sludge wrapping agent CHAMPRO-AP1080 and a sludge wrapping agent JHWB-1319;
step two, pulp preparation;
concentrating the obtained second slurry in a surface layer mixing tank and a surface layer pre-copying tank, diluting the second slurry in a surface layer flow part, screening before screening, and removing surface layer flow box to perform slurry distribution and net surfing; taking the material as a gray paperboard surface layer sizing agent; wherein the gray paperboard surface layer slurry accounts for 20% of the total slurry;
the weight ratio is 1:1.3 to 1.8, pumping the first slurry and the third slurry into a lining mixing tank and a lining pre-copying tank for mixing and thickening; then pumping the obtained slurry to a lining flow-out part for dilution and screening before screening, and removing the lining layer of the paper machine to perform slurry distribution and screening in a slurry box; as a gray paperboard liner slurry; wherein the gray paperboard lining slurry accounts for 20% of the total slurry;
the first sizing agent, the third sizing agent and the papermaking sludge sizing agent are mixed according to the weight ratio of 1:1.2 to 1.5: pumping 0.6-0.9 to a core layer mixing tank and a core layer pre-copying tank for mixing and thickening, and conveying the mixed and thickened slurry to a core layer flow conveying part for dilution and screening before net; pulp is distributed and screened in a pulp box of a paper removing machine core layer, and the pulp is used as gray paperboard core pulp; wherein the gray cardboard core slurry accounts for 40% of the total slurry;
the first sizing agent and the third sizing agent are mixed according to the weight ratio of 1: 1-1.5 pumping a bottom layer mixing tank and a bottom layer pre-copying tank for mixing and thickening, conveying the mixed and thickened slurry to a bottom layer flow part for dilution and screening before screening, and distributing the slurry to a bottom layer slurry tank of a paper machine for screening, wherein the slurry is used as a bottom layer slurry of a gray paperboard; wherein the bottom layer slurry of the gray paperboard accounts for 20% of the total slurry;
the compound retention aid used in the step IV is prepared from an inorganic retention aid and an organic retention aid according to the mass ratio of 1.5-2.0: 1, mixing and preparing; the dosage of the compound retention aid is 0.3-0.5 kg/t papermaking sludge;
the preparation method of the inorganic retention aid comprises the following steps: immersing zeolite micro powder in the mixed solution for 2-4 h; filtering out zeolite micropowder, and washing the zeolite micropowder with deionized water; then adopting a centrifugal machine to carry out centrifugal treatment, pouring out supernatant fluid, and repeatedly cleaning the supernatant fluid until no white precipitate is generated by using sodium chloride solution for inspection; drying and grinding the zeolite micro powder after the washing treatment to 500-700 meshes to obtain an inorganic retention aid finished product;
the preparation method of the mixed solution comprises the following steps: adding 6-10% of 2-methyl-4-isothiazolin-3-ketone into 0.15-0.32 mol/L silver nitrate solution, and uniformly mixing and stirring to obtain the mixed solution finished product.
2. A method of pulping gray paperboard as in claim 1, wherein: the grain size of the zeolite micro powder is 80-150 meshes, and the dosage ratio of the zeolite micro powder to the mixed solution is 0.06-0.12 g/mL.
3. A method of pulping gray paperboard as in claim 1, wherein: the centrifugal speed of the centrifugal machine is set to 3000-4000 r/min, and the centrifugal treatment time is set to 20-30 min.
4. A method of pulping gray paperboard as in claim 1, wherein: the organic retention aid is selected from any one of polyacrylamide and cationic starch.
5. A method of pulping gray paperboard as in claim 1, wherein: the temperature of the mixed solution is 65-80 ℃, and the pH value of the mixed solution is adjusted to 6.5-7.8.
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