CN113605136A - Method for recycling waste paper pulp - Google Patents
Method for recycling waste paper pulp Download PDFInfo
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- CN113605136A CN113605136A CN202110948653.2A CN202110948653A CN113605136A CN 113605136 A CN113605136 A CN 113605136A CN 202110948653 A CN202110948653 A CN 202110948653A CN 113605136 A CN113605136 A CN 113605136A
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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
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
- D21C5/027—Chemicals therefor
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/62—Rosin; Derivatives thereof
-
- 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
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- 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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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of waste paper pulp recycling, in particular to a method for recycling waste paper pulp; the invention takes waste paper pulp as raw material, and after the processes of screening, removing impurities, deinking, flotation, purification, performance enhancement and the like are carried out on the waste paper pulp in sequence, the processes of dewatering, bleaching, pulping, purifying and the like are carried out on the obtained waste paper pulp in sequence, and finally, a finished newsprint is prepared. The invention takes the waste paper pulp as the raw material for preparing the newsprint, realizes the recycling of the waste materials, not only reduces the pollution to the environment, but also realizes the recycling of resources, saves the resources and simultaneously reduces the production cost; in addition, trimethyl glycine and organic acid are used as raw materials for preparing the functional modifier, so that the mechanical strength of the prepared newsprint is improved to a certain extent; in addition, the filler is matched with the newsprint paper for use, so that the mechanical property of the prepared newsprint paper is further improved, and the quality of the prepared newsprint paper is ensured.
Description
Technical Field
The invention relates to the technical field of waste paper pulp recycling, in particular to a method for recycling waste paper pulp.
Background
Paper making is an important invention for ancient Chinese workers. The method is divided into a mechanism mode and a manual mode. The mechanism is continuously carried out on a paper machine, pulp suitable for paper quality is diluted to certain concentration by water, and is primarily dewatered at a wire part of the paper machine to form a wet paper sheet, and then the wet paper sheet is pressed for dewatering and then dried to form paper.
The waste paper pulp is inevitably generated in the papermaking process, and the waste paper pulp can be generally used for papermaking together with other paper pulp, and the specific gravity of the waste paper pulp fluctuates up and down according to the quality of papermaking paper. In addition, the waste pulp itself has many uses. Such as: the manufacture of newsprint is one of the more important applications. Therefore, the pollution of the waste paper pulp to the environment is reduced, and the waste is recycled to a certain extent.
However, when the waste paper pulp is manufactured into newsprint by the current process, the obtained newsprint product has relatively poor mechanical properties and relatively high dust degree, which seriously affects the quality and quality of the newsprint product. Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a method for recycling waste paper pulp.
Disclosure of Invention
The invention aims to provide a method for recycling waste paper pulp, and the manufactured newsprint has excellent mechanical property and relatively low dust degree, so that the quality and quality of the newsprint are effectively ensured; in addition, the invention takes the waste paper pulp as the raw material for preparing the newsprint, realizes the recycling of the waste materials, reduces the pollution to the environment, realizes the recycling of resources, saves the resources and reduces the production cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for recycling waste paper pulp comprises the following steps:
step one, screening and removing impurities from waste paper pulp;
transferring waste paper pulp to be treated into high-concentration deslagging equipment for deslagging, and transferring the paper pulp into coarse screening equipment for coarse filtration; the paper pulp after the coarse filtration treatment is transferred into a low-concentration deslagging device for low-concentration deslagging treatment, and then the obtained paper pulp is transferred into a fine screening device for fine filtration treatment; storing the waste paper pulp after screening treatment for later use;
step two, deinking waste paper pulp;
conveying the waste paper pulp treated in the step one to deinking equipment, respectively adding a compound deinking agent accounting for 0.5-2% of the weight of the waste paper pulp and a proper amount of compound enzyme preparation into a tank, then supplementing a proper amount of water into the waste paper pulp to ensure that the concentration of the waste paper pulp is kept at 0.5-1.2 wt%, and adjusting the pH value to 6.3-6.8; then carrying out deinking treatment on the waste paper;
step three, waste paper pulp flotation purification;
conveying the waste paper pulp treated in the step two to a flotation tank, and injecting white water of a paper mill into the flotation tank to dilute the waste paper pulp; the waste paper pulp is kept still in a flotation tank and then is subjected to flotation treatment to remove the ink, light bonding materials and light plastics floating on the upper layer of the waste paper pulp;
step four, strengthening the performance of the waste paper pulp;
concentrating the waste paper pulp subjected to flotation treatment to the concentration of 4-7 wt%, adding 0.8-1.5 wt% of functional modifier into the waste paper pulp, mixing and stirring uniformly, and treating the obtained mixed components in a constant-temperature water bath at 50-70 ℃ for 2-3 h;
step five, preparing newsprint;
and (3) sequentially dehydrating and bleaching the waste paper pulp treated in the fourth step, then respectively adding rosin size accounting for 1.0-1.5 wt% of the waste paper pulp, aluminum sulfate accounting for 4-7% of the waste paper pulp and filler accounting for 8-12% of the waste paper pulp, and then sequentially pulping, purifying, papermaking, coating, trimming, rolling and packaging the obtained mixed paper pulp to obtain a newsprint finished product.
Furthermore, the waste paper pulp used in the screening and impurity removing process is any one of office waste paper pulp, old newspaper pulp or old magazine pulp.
Furthermore, the compound deinking agent is prepared from sodium cocoyl methyl taurate and nonylphenol polyoxyethylene ether according to a mass ratio of 1: 1-1.5.
Furthermore, the compound enzyme preparation is prepared by compounding lipase, cellulase and amylase according to a certain dosage ratio.
Furthermore, the dosages of the lipase, the cellulase and the amylase are respectively 0.25-0.8 u/g, 0.2-0.6 u/g and 0.3-1.0 u/g.
Further, the preparation method of the functional modifier comprises the following steps: according to the following steps: 1-3, respectively weighing a proper amount of betaine and organic acid, uniformly mixing the betaine and the organic acid, and heating and stirring at 100-130 ℃ for 5-10 min; the obtained product is the finished product of the functional modifier.
Furthermore, the organic acid is any one of citric acid, malic acid and succinic acid.
Furthermore, in the fourth step, the mixed components are kneaded once every 10-20 min in the process of treatment under the condition of constant-temperature water bath.
Furthermore, the filler comprises calcium carbonate, talcum powder, dolomite powder and titanium dioxide, and the mass ratio of the filler to the talcum powder is 1: 0.2-0.5: 0.25-0.4: 0.08 to 0.15.
Further, the calcium carbonate, the talc powder, the dolomite powder and the titanium dioxide are ground to fine particles having a particle size of 600 to 800 mesh before use.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention takes waste paper pulp as raw material, and after the processes of screening, removing impurities, deinking, flotation, purification, performance enhancement and the like are carried out on the waste paper pulp in sequence, the processes of dewatering, bleaching, pulping, purifying and the like are carried out on the obtained waste paper pulp in sequence, and finally, a finished newsprint is prepared. The invention takes the waste paper pulp as the raw material for preparing the newsprint, realizes the recycling of the waste materials, not only reduces the pollution to the environment, but also realizes the recycling of resources, saves the resources and simultaneously reduces the production cost.
2. The invention adopts the compound deinking agent and the compound enzyme preparation to deink the waste paper pulp; the compound deinking agent consists of sodium cocoyl methyl taurate and nonylphenol polyoxyethylene ether, and the compound enzyme preparation is prepared by compounding lipase, cellulase and amylase. By the synergistic cooperation of the compound deinking agent and the compound enzyme preparation, the deinking efficiency and deinking quality of waste paper pulp can be effectively improved, the dust degree of subsequently manufactured newsprint is reduced, and the quality and quality of the subsequently manufactured newsprint are ensured.
3. According to the invention, trimethyl glycine and organic acid are used as raw materials for preparing the functional modifier, and the prepared functional modifier has a certain expansion effect on fibers in waste paper pulp, so that the binding force between the fibers in paper pulp formation is effectively enhanced, and the mechanical strength of the prepared newsprint is improved to a certain extent. In addition, the filler is matched with the newsprint paper for use, so that the mechanical property of the prepared newsprint paper is further improved, and the quality of the prepared newsprint paper is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for recycling waste paper pulp comprises the following steps:
step one, screening and removing impurities from waste paper pulp;
transferring waste paper pulp to be treated into high-concentration deslagging equipment for deslagging, and transferring the paper pulp into coarse screening equipment for coarse filtration; the paper pulp after the coarse filtration treatment is transferred into a low-concentration deslagging device for low-concentration deslagging treatment, and then the obtained paper pulp is transferred into a fine screening device for fine filtration treatment; storing the waste paper pulp after screening treatment for later use;
step two, deinking waste paper pulp;
conveying the waste paper pulp treated in the step one to deinking equipment, respectively adding a compound deinking agent accounting for 0.5 percent of the weight of the waste paper pulp and a proper amount of compound enzyme preparation into a tank, then supplementing a proper amount of water into the waste paper pulp to ensure that the concentration of the waste paper pulp is kept at 0.5wt percent, and adjusting the pH value of the waste paper pulp to 6.3; then carrying out deinking treatment on the waste paper;
step three, waste paper pulp flotation purification;
conveying the waste paper pulp treated in the step two to a flotation tank, and injecting white water of a paper mill into the flotation tank to dilute the waste paper pulp; the waste paper pulp is kept still in a flotation tank and then is subjected to flotation treatment to remove the ink, light bonding materials and light plastics floating on the upper layer of the waste paper pulp;
step four, strengthening the performance of the waste paper pulp;
concentrating the waste paper pulp subjected to flotation treatment to the concentration of 4 wt%, adding 0.8 wt% of functional modifier into the waste paper pulp, mixing and stirring uniformly, and treating the obtained mixed components in a constant-temperature water bath at 50 ℃ for 2 hours;
step five, preparing newsprint;
and (3) sequentially dehydrating and bleaching the waste paper pulp treated in the fourth step, then respectively adding rosin size accounting for 1.0 wt% of the waste paper pulp, 4% of aluminum sulfate and 8% of filler, and then sequentially pulping, purifying, papermaking, coating, trimming, rolling and packaging the obtained mixed paper pulp to obtain a newsprint finished product.
The waste paper pulp used in the screening and impurity removing process is office waste paper pulp.
The compound deinking agent is compounded by sodium cocoyl methyl taurate, nonylphenol polyoxyethylene ether and the like.
The dosages of the lipase, the cellulase and the amylase in the compound enzyme preparation are respectively 0.25u/g, 0.2u/g and 0.3 u/g.
The preparation method of the functional modifier comprises the following steps: according to the following steps: 1, respectively weighing appropriate amount of betaine and citric acid, uniformly mixing the betaine and the citric acid, and heating and stirring at 100 ℃ for 5 min; the obtained product is the finished product of the functional modifier.
In the fourth step, the mixed components are kneaded once every 10min in the process of being processed under the condition of constant-temperature water bath.
The filler comprises calcium carbonate, talcum powder, dolomite powder and titanium dioxide, and the mass ratio of the filler to the filler is 1: 0.2: 0.25: 0.08; and the calcium carbonate, the talc powder, the dolomite powder and the titanium dioxide are all ground to particles with the particle size of 600 meshes before use.
Example 2
The main differences between this example and example 1 are:
the consumption of the compound deinking agent is 1.5 percent of the waste paper pulp; and the sodium cocoyl methyl taurate and the polyoxyethylene nonyl phenyl ether are mixed according to the mass ratio of 1: 1.2 is prepared by compounding.
During deinking, the concentration of the waste pulp was kept at 0.9 wt%, and its pH was adjusted to 6.5.
The waste paper pulp after flotation treatment is concentrated to the concentration of 6 wt%, and the dosage of the functional modifier is 1.2% of the waste paper pulp.
When preparing newsprint, the dosage of rosin size, aluminum sulfate and filler are respectively 1.3 wt%, 6% and 10% of waste paper pulp.
The compound deinking agent is prepared from sodium cocoyl methyl taurate and nonylphenol polyoxyethylene ether according to the mass ratio of 1: 1.2 is prepared by compounding.
The dosages of the lipase, the cellulase and the amylase in the compound enzyme preparation are respectively 0.5u/g, 0.4u/g and 0.7 u/g.
The preparation method of the functional modifier comprises the following steps: according to the following steps: 2, respectively weighing appropriate amount of betaine and malic acid, uniformly mixing the betaine and the malic acid, and heating and stirring at 110 ℃ for 8 min; the obtained product is the finished product of the functional modifier.
In the fourth step, the mixed components are kneaded once every 15min in the process of being processed under the condition of constant-temperature water bath.
The filler comprises calcium carbonate, talcum powder, dolomite powder and titanium dioxide, and the mass ratio of the filler to the filler is 1: 0.4: 0.35: 0.1; and the calcium carbonate, the talc powder, the dolomite powder and the titanium dioxide are all ground to particles with the particle size of 700 meshes before use.
Example 3
The main differences between this example and example 1 are:
the consumption of the compound deinking agent is 2 percent of the waste paper pulp; and the sodium cocoyl methyl taurate and the polyoxyethylene nonyl phenyl ether are mixed according to the mass ratio of 1: 1.5 is prepared by compounding.
During deinking, the concentration of the waste pulp was kept at 1.2 wt%, and its pH was adjusted to 6.8.
The waste paper pulp after flotation treatment is concentrated to the concentration of 7 wt%, and the dosage of the functional modifier is 1.5% of the waste paper pulp.
When preparing newsprint, the dosage of rosin size, aluminum sulfate and filler are respectively 1.5 wt%, 7% and 12% of waste paper pulp.
The compound deinking agent is prepared from sodium cocoyl methyl taurate and nonylphenol polyoxyethylene ether according to the mass ratio of 1: 1.5 is prepared by compounding.
The dosages of the lipase, the cellulase and the amylase in the compound enzyme preparation are respectively 0.8u/g, 0.6u/g and 1.0 u/g.
The preparation method of the functional modifier comprises the following steps: according to the following steps: 3, respectively weighing appropriate amount of betaine and malic acid, uniformly mixing the betaine and the malic acid, and heating and stirring at 130 ℃ for 10 min; the obtained product is the finished product of the functional modifier.
In the fourth step, the mixed components are kneaded once every 20min in the process of being processed under the condition of constant-temperature water bath.
The filler comprises calcium carbonate, talcum powder, dolomite powder and titanium dioxide, and the mass ratio of the filler to the filler is 1: 0.5: 0.4: 0.15; and the calcium carbonate, the talcum powder, the dolomite powder and the titanium dioxide are ground into particles with the particle size of 800 meshes before use.
Comparative example 1: the main differences between this embodiment and embodiment 1 are: when the waste paper pulp is recycled, the waste paper pulp is not subjected to strengthening treatment by using a functional modifier;
comparative example 2: the main differences between this embodiment and embodiment 1 are: only using a compound deinking agent in the deinking treatment process of the waste paper pulp;
comparative example 3: the main differences between this embodiment and embodiment 1 are: only a compound enzyme preparation is used in the deinking treatment process of the waste paper pulp;
performance testing
Newsprint obtained by examples 1 to 3 of the present invention are referred to as experimental examples 1 to 3; the newsprint obtained in comparative examples 1 to 3 was recorded as a comparative example; then, the newsprint papers provided in experimental examples 1 to 3 and the comparative example were subjected to the related performance tests, and the obtained data are recorded in the following table:
the relevant data in the table show that the manufactured newsprint has excellent mechanical property and relatively low dust degree, and the quality and quality of the newsprint are effectively ensured; in addition, the invention takes the waste paper pulp as the raw material for preparing the newsprint, realizes the recycling of the waste materials, reduces the pollution to the environment, realizes the recycling of resources, saves the resources and reduces the production cost. Therefore, the newsprint product produced by the invention has wider market prospect and is more suitable for popularization.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments 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 utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A method for recycling waste paper pulp is characterized by comprising the following steps:
step one, screening and removing impurities from waste paper pulp;
transferring waste paper pulp to be treated into high-concentration deslagging equipment for deslagging, and transferring the paper pulp into coarse screening equipment for coarse filtration; the paper pulp after the coarse filtration treatment is transferred into a low-concentration deslagging device for low-concentration deslagging treatment, and then the obtained paper pulp is transferred into a fine screening device for fine filtration treatment; storing the waste paper pulp after screening treatment for later use;
step two, deinking waste paper pulp;
conveying the waste paper pulp treated in the step one to deinking equipment, respectively adding a compound deinking agent accounting for 0.5-2% of the weight of the waste paper pulp and a proper amount of compound enzyme preparation into a tank, then supplementing a proper amount of water into the waste paper pulp to ensure that the concentration of the waste paper pulp is kept at 0.5-1.2 wt%, and adjusting the pH value to 6.3-6.8; then carrying out deinking treatment on the waste paper;
step three, waste paper pulp flotation purification;
conveying the waste paper pulp treated in the step two to a flotation tank, and injecting white water of a paper mill into the flotation tank to dilute the waste paper pulp; the waste paper pulp is kept still in a flotation tank and then is subjected to flotation treatment to remove the ink, light bonding materials and light plastics floating on the upper layer of the waste paper pulp;
step four, strengthening the performance of the waste paper pulp;
concentrating the waste paper pulp subjected to flotation treatment to the concentration of 4-7 wt%, adding 0.8-1.5 wt% of functional modifier into the waste paper pulp, mixing and stirring uniformly, and treating the obtained mixed components in a constant-temperature water bath at 50-70 ℃ for 2-3 h;
step five, preparing newsprint;
and (3) sequentially dehydrating and bleaching the waste paper pulp treated in the fourth step, then respectively adding rosin size accounting for 1.0-1.5 wt% of the waste paper pulp, aluminum sulfate accounting for 4-7% of the waste paper pulp and filler accounting for 8-12% of the waste paper pulp, and then sequentially pulping, purifying, papermaking, coating, trimming, rolling and packaging the obtained mixed paper pulp to obtain a newsprint finished product.
2. The method of recycling waste paper pulp according to claim 1, wherein: the waste paper pulp used in the screening and impurity removing process is any one of office waste paper pulp, old newspaper pulp or old magazine pulp.
3. The method of recycling waste paper pulp according to claim 1, wherein: the compound deinking agent is prepared from sodium cocoyl methyl taurate and nonylphenol polyoxyethylene ether according to the mass ratio of 1: 1-1.5.
4. The method of recycling waste paper pulp according to claim 1, wherein: the compound enzyme preparation is prepared by compounding lipase, cellulase and amylase according to a certain dosage ratio.
5. The method of recycling waste paper pulp according to claim 4, wherein: the dosages of the lipase, the cellulase and the amylase are respectively 0.25-0.8 u/g, 0.2-0.6 u/g and 0.3-1.0 u/g.
6. The method for recycling waste paper pulp as claimed in claim 1, wherein the method for preparing the functional modifier comprises: according to the following steps: 1-3, respectively weighing a proper amount of betaine and organic acid, uniformly mixing the betaine and the organic acid, and heating and stirring at 100-130 ℃ for 5-10 min; the obtained product is the finished product of the functional modifier.
7. The method of recycling waste paper pulp according to claim 6, wherein: the organic acid is any one of citric acid, malic acid and succinic acid.
8. The method of recycling waste paper pulp according to claim 1, wherein: in the fourth step, the mixed components are kneaded once every 10-20 min in the process of being treated under the condition of constant-temperature water bath.
9. The method of recycling waste paper pulp according to claim 1, wherein: the filler comprises calcium carbonate, talcum powder, dolomite powder and titanium dioxide, and the mass ratio of the filler to the filler is 1: 0.2-0.5: 0.25-0.4: 0.08 to 0.15.
10. The method of recycling waste paper pulp according to claim 9, wherein: the calcium carbonate, the talcum powder, the dolomite powder and the titanium dioxide are ground into particles with the particle size of 600-800 meshes before use.
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