CN115652683B - Papermaking method and papermaking system - Google Patents
Papermaking method and papermaking system Download PDFInfo
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- CN115652683B CN115652683B CN202211451962.XA CN202211451962A CN115652683B CN 115652683 B CN115652683 B CN 115652683B CN 202211451962 A CN202211451962 A CN 202211451962A CN 115652683 B CN115652683 B CN 115652683B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 54
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000178 monomer Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229940015043 glyoxal Drugs 0.000 claims abstract description 24
- 238000011010 flushing procedure Methods 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000002699 waste material Substances 0.000 claims abstract description 5
- 239000000123 paper Substances 0.000 claims description 60
- 239000002002 slurry Substances 0.000 claims description 35
- 125000002091 cationic group Chemical group 0.000 claims description 31
- 238000003860 storage Methods 0.000 claims description 18
- 239000000839 emulsion Substances 0.000 claims description 15
- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 claims description 11
- 239000010802 sludge Substances 0.000 claims description 7
- 150000001768 cations Chemical class 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 12
- 229920002472 Starch Polymers 0.000 abstract description 7
- 235000019698 starch Nutrition 0.000 abstract description 7
- 239000008107 starch Substances 0.000 abstract description 7
- 239000000084 colloidal system Substances 0.000 abstract description 6
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 21
- 239000000843 powder Substances 0.000 description 15
- 238000005189 flocculation Methods 0.000 description 12
- 230000016615 flocculation Effects 0.000 description 12
- 230000014759 maintenance of location Effects 0.000 description 11
- 230000018044 dehydration Effects 0.000 description 9
- 238000006297 dehydration reaction Methods 0.000 description 9
- 125000000129 anionic group Chemical group 0.000 description 7
- 239000010813 municipal solid waste Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010893 paper waste Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229920006318 anionic polymer Polymers 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- -1 conductivity Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002800 charge carrier Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000021197 fiber intake Nutrition 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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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- Paper (AREA)
Abstract
The invention discloses a papermaking method and a papermaking system, and belongs to the technical field of papermaking. The papermaking system comprises a papermaking forehearth, a pulp flushing pump, a pressure screen and a pulp flowing box; a stirring component is arranged in the pre-copying pool; the liquid outlet of the pre-copying pool is connected with the liquid inlet of the pulp flushing pump through a pipeline; a filter assembly is fixed at the end part of the liquid inlet of the pulp pump and is arranged at the joint of the pulp pump and the pipeline; the liquid outlet of the pulp flushing pump is connected with the liquid inlet of the pressure screen through a pipeline; the liquid outlet of the pressure screen is connected with the liquid inlet of the head box through a pipeline, the glyoxal grafted modified polyacrylamide is matched with the catching monomer, the glyoxal grafted modified polyacrylamide is used for opening a water filtering channel, the catching monomer is used for relieving the blockage of colloid substances to the water filtering channel, the solid content in white water and the starch content in the white water are reduced, the consumption of starch can be effectively reduced, the ash content of paper is improved, the COD concentration of waste white water is reduced, and the load of wastewater treatment is reduced.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a papermaking method and a papermaking system.
Background
The typical process of bobbin paper is to use recycled waste paper, wood powder, pulp slag, sludge and the like as raw materials for papermaking, prepare pulp through a pulp line and send the pulp to a paper machine for papermaking.
However, the bobbin paper has poor raw materials, low fiber quality, low long fiber ratio and mainly comprises fine fibers, and meanwhile, the recycled sludge is added into the system, so that more colloid substances are in the system. In the process of bobbin paper forming, tiny components can enter white water, the retention rate is reduced, and the raw material consumption is high. Meanwhile, as the closed circulation degree of white water is high and the number of interfering substances such as conductivity, colloid substances, dissolved charges and the like in the system is large, slurry is difficult to dehydrate, a paste net is easy to form, and the operation efficiency, the speed, the yield, the steam consumption and the like of the paper machine are affected. The prior main improvement method comprises the following steps: ① Adding solid polyacrylamide powder with high molecular weight and medium plasma degree near a pre-net pressure screen to improve the retention rate of fine components and the dehydration performance of the system; ② Improving the dehydration of the net part of the bobbin paper by adding drainage enzyme; ③ The retention rate of the fine components is improved by the combination of the solid polyacrylamide powder with high molecular weight and medium plasma degree and bentonite. However, the method ① is greatly influenced by the fluctuation of the pulp system of the paper machine, the formed flocculation is larger, the uniformity of the formed paper is influenced, and the retention rate of the fine components is poorer; the drainage enzyme in method ② is prone to decrease in paper strength; although the method ③ can improve the retention rate, it cannot improve the problem of poor dewatering of the wire section.
Therefore, in the existing bobbin paper preparation process, a technology capable of remarkably improving the dehydration of the paper machine wire part under the condition of not affecting the operation of the paper machine system and keeping the tiny components is needed.
Disclosure of Invention
The invention provides a papermaking method and a papermaking system, which are used for solving the technical problems that the retention rate of fine components and the dewatering effect of a net part cannot be improved in the preparation process of the existing bobbin paper.
A method of making paper comprising the step of adding a modifying monomer solution to a papermaking system, characterized in that the modifying monomer solution comprises a capturing monomer solution and a cationic monomer solution; the capturing monomer solution and the cation monomer solution are respectively added; the capturing monomer solution is polydiallyl dimethyl ammonium chloride solution, and the cation monomer solution is glyoxal grafted polyacrylamide solution.
Preferably or alternatively, the capture monomer solution is stored in a first reservoir; the upper part of the first storage tank is provided with a first water inlet and a first medicine groove respectively, and the lower end of the first storage tank is provided with a discharge hole.
Preferably or alternatively, the cationic monomer solution is stored in a second storage tank; the upper part of the second storage tank is provided with a second water inlet and a second medicine groove respectively, and the lower end of the second storage tank is provided with a discharge hole.
Preferably or alternatively, the solid content of the polydiallyl dimethyl ammonium chloride in the polydiallyl dimethyl ammonium chloride solution is 30% -40%, and the solid content of the glyoxal grafted polyacrylamide in the glyoxal grafted polyacrylamide solution is 25% -30%.
The papermaking system comprises a papermaking front tank, a pulp flushing pump, a pressure screen and a pulp flowing box; a stirring assembly is arranged in the pre-copying pool; the liquid outlet of the pre-copying pool is connected with the liquid inlet of the flushing pump through a pipeline; a filtering component is fixed at the end part of the liquid inlet of the pulp pump, and the filtering component is arranged at the joint of the pulp pump and the pipeline; the liquid outlet of the pulp flushing pump is connected with the liquid inlet of the pressure screen through a pipeline; the liquid outlet of the pressure screen is connected with the liquid inlet of the head box through a pipeline.
Preferably or alternatively, the papermaking pond contains primary pulp, and the components of the primary pulp are
Preferably or alternatively, a first liquid inlet branch pipe is arranged on a pipeline connected with the liquid outlet of the pre-papermaking tank and the liquid inlet of the flushing pump; the liquid inlet branch pipe is connected with a discharge hole of the first storage tank; a second liquid inlet branch pipe is arranged on a pipeline connected with the liquid outlet of the pulp flushing pump and the liquid inlet of the pressure screen; the liquid inlet branch pipe is connected with a discharge hole of the second storage tank.
Preferably or optionally, the apparatus further comprises a third feed port and a fourth feed port; the third feeding port and the fourth feeding port are respectively arranged at the pipeline connection part of the liquid outlet of the pressure screen and the liquid inlet of the head box.
Preferably or alternatively, the third feeding port is filled with solid polyacrylamide, and the fourth feeding port is filled with cationic polyacrylamide emulsion.
The beneficial effects are that: the invention provides a papermaking method and a papermaking system, which are used for improving the dehydration of a bobbin paper machine by using glyoxal grafted modified polyacrylamide to match with a capturing monomer and a retention and drainage system, wherein the glyoxal grafted modified polyacrylamide has higher positive charge density while effectively improving the strength of paper sheets, can perform neutralization reaction with colloid carrying negative charges in bobbin paper pulp, and can form hydrogen bond combination with hydroxyl and carboxyl of the fiber due to good reactivity of the glyoxal grafted modified polyacrylamide and the fiber, and the cationic group of the glyoxal grafted modified polyacrylamide can form ionic bond combination with the fiber, so that a reaction product is combined with the fiber through glyoxal grafted modified polyacrylamide, is adsorbed on the fiber, opens a drainage channel and improves vacuum drainage; the use of solid polyacrylamide powder and cationic polyacrylamide emulsion after pretreatment promotes more adsorption of the flocs of these microcolloids in long fibers or fiber clusters and a more uniform distribution. The fiber and the tiny components form the flocculation to form gaps, so that gravity dewatering of the net part is smoother, after the fiber forming the flocculation is subjected to shearing force in a pipeline, part of the flocculation can be relieved, and the scattered small flocculation can be flocculated again to form grid-shaped flocculation, so that the paper web dewatering speed of a vacuum dewatering area of the net part is increased, the paper machine retention, dewatering and paper uniformity are obviously improved, the dryness of the paper web outlet part is obviously improved, and the dewatering efficiency of a squeezing part is also obviously improved. The polydiallyl dimethyl ammonium chloride serving as a capturing monomer can capture the dissolved anionic polymer and colloidal anionic substances in the paper machine slurry, can gather and adsorb the colloidal substances on the fiber surface, and can relieve the blockage of the glyoxal grafted modified polyacrylamide dehydration channel by the colloidal substances. According to the invention, the glyoxal grafted modified polyacrylamide is matched with the capturing monomer, so that the solid content in the white water and the starch content in the white water are reduced, the starch consumption can be effectively reduced, the ash content of the finished paper is improved, the COD concentration of the waste white water is reduced, and the load of wastewater treatment is reduced.
Drawings
FIG. 1 is a papermaking process diagram of the present invention;
FIG. 2 is a schematic diagram of a papermaking system according to the present invention;
the reference numerals are: a pre-papermaking tank 1, a stirring assembly 1.1, a pulp flushing pump 2, a filtering assembly 2.1, a pressure screen 3, a head box 4, a first storage tank 5, a second storage tank 6, a third feed inlet 7 and a fourth feed inlet 8
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.
The invention is further illustrated below in conjunction with examples, examples of which are intended to illustrate the invention and are not to be construed as limiting the invention. The specific techniques and reaction conditions not specified in the examples may be carried out according to the techniques or conditions described in the literature in this field or the product specifications. Reagents, instruments or equipment not specifically mentioned in the manufacturer are commercially available.
Because the raw materials of the bobbin paper are poor, fine components can enter white water in the process of forming the bobbin paper, the retention rate is reduced, and the raw material consumption is high. Meanwhile, as the closed circulation degree of white water is high and the interference substances such as conductivity, colloid substances, dissolved charges and the like in the system are increased, the retention of fine components in the forming process of the paper machine is poor, the slurry is difficult to dewater, a paste net is easy to form, and the operation efficiency, the speed, the yield, the steam consumption and the like of the paper machine are affected. The concentration of the net water is high, the COD concentration of the redundant water discharged to a sewage treatment plant is improved, the sewage treatment load is increased, and the operation efficiency of the whole papermaking system is affected.
The concentration of the sizing agent for normally feeding the bobbin paper is 0.5-1.5%, 100-330 t of water is normally required to be removed from 1t of sizing agent to the finished paper, and dehydration plays an important role in the paper forming process. When the paper comes out of the forming wire part of the paper machine, the dryness of the paper must reach 18% -22%, the dryness of the paper coming out of the pressing part must reach more than 40%, the rest steam is dried, and the dehydration of the wire part is an indispensable part of the whole paper drying process, so that the running efficiency of the following paper machine is directly affected.
FIG. 1 is a papermaking process diagram, referring to FIG. 2, a papermaking system comprises a papermaking forehearth 1, a pulp flushing pump 2, a pressure screen 3 and a headbox 4; a stirring assembly 1.1 is arranged in the shoveling front tank 1; the liquid outlet of the shoveling front tank 1 is connected with the liquid inlet of the flushing pump 2 through a pipeline; a filter component 2.1 is fixed at the end part of the liquid inlet of the pulp pump 2, and is arranged at the joint of the pulp pump and the pipeline; the liquid outlet of the pulp flushing pump is connected with the liquid inlet of the pressure screen through a pipeline; the liquid outlet of the pressure screen is connected with the liquid inlet of the head box through a pipeline. The papermaking pond is internally provided with raw slurry, and the components of the raw slurry comprise recovered color yarn tubes, recovered waste cardboard paper, sludge and slurry residues. The slurry adopted by the invention is laboratory simulated bobbin paper slurry, the same formula adopts waste paper tubes as slurry, the slurry concentration is 1%, and the sludge addition amount is 3 kg/ton of slurry. A first liquid inlet branch pipe is arranged on a pipeline connected with the liquid outlet of the pre-copying pool 1 and the liquid inlet of the flushing pump 2; the liquid inlet branch pipe is connected with a discharge port of the first storage tank 5; a second liquid inlet branch pipe is arranged on a pipeline connected with the liquid outlet of the pulp flushing pump and the liquid inlet of the pressure screen 3; the liquid inlet branch pipe is connected with a discharge hole of the second storage tank 6. The device also comprises a third feeding port 7 and a fourth feeding port 8; the third feed inlet 7 and the fourth feed inlet 8 are respectively arranged at the pipeline connection part of the liquid outlet of the pressure screen 3 and the liquid inlet of the head box 4, solid polyacrylamide is contained in the third feed inlet 7, and cationic polyacrylamide emulsion is contained in the fourth feed inlet 8.
The product used is as follows:
anionic trash catcher: the main component of the catalyst is polydiallyl dimethyl ammonium chloride, and the solid content is 30-40%;
Glyoxal grafted modified polyacrylamide (cationic): molecular weight 30-50 ten thousand, mass ion degree 25-30%;
solid polyacrylamide powder (cation), molecular weight: 550-650 ten thousand, and the mass ion degree is 40-60%;
cationic polyacrylamide emulsion: molecular weight: 450-550 ten thousand, and the mass ion degree is 40-50%;
The anionic trash catcher can catch anionic polymers and colloidal anionic substances dissolved in paper machine slurry, can alleviate colloidal substances in bobbin paper from gathering and adsorbing on the surface of fibers, and can alleviate blockage of dewatering channels by the colloidal substances. The glyoxal grafted modified polyacrylamide has strong positive effect, can be subjected to neutralization reaction with charge carriers, and the reaction product is adsorbed on the fiber through the reaction of the glyoxal grafted modified polyacrylamide with carboxyl and hydroxyl of the fiber, so that a water filtering channel is opened, vacuum water filtering is improved, and meanwhile, the strength of paper sheets can be effectively improved through the glyoxal grafted modified polyacrylamide; the use of solid polyacrylamide powder and cationic polyacrylamide emulsion after pretreatment promotes more adsorption of the flocs of these microcolloids in long fibers or fiber clusters and a more uniform distribution. The fiber and tiny components form the flocculation and then can form gaps, so that gravity dewatering of the net part is smoother, after the fiber forming the flocculation is subjected to shearing force in a pipeline, part of the flocculation can be dispersed, and the dispersed small flocculation can be flocculated again to form grid-shaped flocculation, so that the paper web dewatering speed of a vacuum dewatering area of the net part is increased, the paper machine retention, dewatering and paper uniformity are obviously improved, the dryness of the paper web outlet part is obviously improved, the dewatering efficiency of a squeezing part is also obviously improved, the fiber consumption is reduced, the steam consumption is reduced, and the effect of making high-gram-weight and thick bobbin paper is more obvious.
In the process of forming the grid-shaped flocculation, the fine components and starch colloid of the system can be effectively trapped, the solid content in the white water and the starch content in the white water can be reduced, the using amount of starch can be effectively reduced, the ash content of paper can be improved, the COD concentration of waste white water can be reduced, and the wastewater treatment load of the bobbin paper can be reduced. The addition of the anionic trash catcher in the method can simultaneously disperse and adsorb the adhesive of the bobbin paper system on the fibers, reduce the residual adhesive in the bobbin paper system and improve the running efficiency of the paper machine.
The method is characterized in that the dosage of the anionic trash catcher added to the front pond of the paper machine is adjusted according to the cationic charge demand of the system, the cationic charge demand of the slurry system is controlled within 500ueq/L, and if the system charge demand is well controlled, the anionic trash catcher can be not added; after a pulp pump is flushed, glyoxal grafted modified polyacrylamide is added, the dosage is 5-10 kg/ton of absolute dry pulp, special type polyacrylamide powder is used after a pressure screen, the dosage is up to 0.5 kg/ton of absolute dry pulp, the dosage is not required to be continuously lifted, the dehydration of a bobbin paper net part cannot be obviously improved after the dosage is continuously lifted, and the uniformity of paper is affected by excessive solid polyacrylamide powder; and after the polyacrylamide powder is added, the cationic emulsion is used, the two adding points are controlled to be more than 3 meters, the dosage of the cationic emulsion is 0.5 kg/ton absolute dry pulp, and the cationic polyacrylamide emulsion can be properly adjusted according to the uniformity of paper, the white water concentration and the ash content of finished paper of the system.
In the embodiment, the slurry is laboratory simulation bobbin paper slurry, waste paper tubes are used as the slurry, the slurry concentration is 1%, the sludge addition amount is 3 kg/ton of slurry, the cationic charge demand of the simulation system is preferably controlled within 500ueq/L, and the cationic charge demand of the system is controlled through a catcher (provided by vast rich technology); the addition amount of the glyoxal grafted modified polyacrylamide (provided by the technology of vast) is 10 kg/ton of paper, and the addition amount of the polyacrylamide powder (provided by the technology of vast) is 0.3 kg/ton of slurry; the addition amount of the polyacrylamide emulsion (provided by vast rich technology) is 0.5 kg/ton of slurry,
Example 1
The charge of the slurry is regulated to-140 ueq/L by 4kg/t polydiallyl dimethyl ammonium chloride, and then the slurry is mixed with 10kg/t glyoxal grafted modified polyacrylamide, 0.3kg/t cationic polyacrylamide powder, 0.5kg/t cationic polyacrylamide emulsion and the slurry, and the mixture is uniformly stirred and fully dispersed.
Example 2
After the charge of the slurry is regulated to be-1350 ueq/L, 4kg/t of polydiallyl dimethyl ammonium chloride and 10kg/t of glyoxal grafted modified polyacrylamide are fully mixed, 3kg/t of cationic polyacrylamide powder and 0.5kg/t of cationic polyacrylamide emulsion are added to the slurry, and the mixture is uniformly stirred and fully dispersed.
Example 3
After the charge of the slurry is regulated to be-1350 ueq/L, 10kg/t glyoxal grafted modified polyacrylamide, 3kg/t cationic polyacrylamide powder and 0.5kg/t cationic polyacrylamide emulsion are uniformly stirred with the slurry and fully dispersed.
Example 4
After the charge of the slurry was adjusted to-1350 ueq/L, 3kg/t of cationic polyacrylamide powder and 0.5kg/t of cationic polyacrylamide emulsion were stirred uniformly with the slurry and dispersed sufficiently.
Example 5
The charge of the slurry is regulated to-140 ueq/L by 4kg/t polydiallyl dimethyl ammonium chloride, and then the slurry is mixed with 0.3kg/t cationic polyacrylamide powder, 0.5kg/t cationic polyacrylamide emulsion and the slurry, and the mixture is stirred uniformly and fully dispersed.
Comparative example 1
A slurry having a charge of-1350 ueq/L was used as comparative example 1.
Results testing:
The examples 1 to 5 and the comparative example 1 were each subjected to a dehydration test, and the weight of moisture removed by gravity and the time required for removal of 110mL of moisture in a vacuum environment were measured in 10 seconds. The test results are shown in the following table:
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Claims (6)
1. A method of making paper comprising the step of adding a modifying monomer solution to a papermaking system, wherein the modifying monomer solution comprises a capturing monomer solution and a cationic monomer solution; the catching monomer solution and the cationic monomer solution are respectively added, and the adding sequence is that firstly the catching monomer solution is added and then the cationic monomer solution is added; the capturing monomer solution is polydiallyl dimethyl ammonium chloride solution, and the cation monomer solution is glyoxal grafted polyacrylamide solution;
The papermaking system comprises a papermaking forehearth, a pulp flushing pump, a pressure screen and a pulp flowing box; a stirring assembly is arranged in the pre-copying pool; the liquid outlet of the pre-copying pool is connected with the liquid inlet of the flushing pump through a pipeline; a filtering component is fixed at the end part of the liquid inlet of the pulp pump, and the filtering component is arranged at the joint of the pulp pump and the pipeline;
The liquid outlet of the pulp flushing pump is connected with the liquid inlet of the pressure screen through a pipeline; the liquid outlet of the pressure screen is connected with the liquid inlet of the head box through a pipeline;
The papermaking system further comprises a third feed inlet and a fourth feed inlet; the third feeding port and the fourth feeding port are respectively arranged at the pipeline connection part of the liquid outlet of the pressure screen and the liquid inlet of the head box;
The third feed port is filled with solid polyacrylamide, and the fourth feed port is filled with cationic polyacrylamide emulsion.
2. The method of making paper according to claim 1, wherein the capturing monomer solution is stored in a first tank; the upper part of the first storage tank is provided with a first water inlet and a first medicine groove respectively, and the lower end of the first storage tank is provided with a discharge hole.
3. The method of making paper according to claim 1, wherein the cationic monomer solution is stored in a second storage tank; the upper part of the second storage tank is provided with a second water inlet and a second medicine groove respectively, and the lower end of the second storage tank is provided with a discharge hole.
4. The method according to claim 1, wherein the solid content of polydiallyl dimethyl ammonium chloride in the polydiallyl dimethyl ammonium chloride solution is 30% -40%, and the solid content of glyoxal grafted polyacrylamide in the glyoxal grafted polyacrylamide solution is 25% -30%.
5. The method of claim 1, wherein the pre-papermaking pond contains a primary slurry, and the primary slurry comprises recycled color tubes, recycled waste cardboard paper, sludge, and sludge.
6. The papermaking method according to claim 1, wherein a first liquid inlet branch pipe is arranged on a pipeline connected with a liquid outlet of the papermaking front tank and a liquid inlet of the pulp flushing pump; the liquid inlet branch pipe is connected with a discharge hole of the first storage tank; a second liquid inlet branch pipe is arranged on a pipeline connected with the liquid outlet of the pulp flushing pump and the liquid inlet of the pressure screen;
The liquid inlet branch pipe is connected with a discharge hole of the second storage tank.
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