CN112553935B - Method for treating high-wet-strength waste paper with low lignin content and low transition metal content - Google Patents
Method for treating high-wet-strength waste paper with low lignin content and low transition metal content Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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Abstract
The invention discloses a method for treating high-wet-strength waste paper with low lignin content and low transition metal content, belonging to the technical field of waste paper papermaking and environmental protection. The high-efficiency dissociation of the high-wet-strength waste paper with low lignin content and low transition metal content is realized by the following method: the bonding between the wet strength agent and the paper fiber is destroyed by cellulose enzyme treatment, peroxide treatment, ozone treatment, microwave treatment and the like, and the defibering, fiber dissociation and recycling of the high wet strength paper are realized under the condition of ensuring that the paper fiber is not destroyed or is little destroyed. The technology overcomes the environmental risk of organic chloride generated by the existing chlorine-containing wet strength paper dissociation agent, has good dissociation effect on the common wet strength paper in the existing market, and has the pulping rate of over 90 percent and the fiber polymerization degree (viscosity) reduction rate of no more than 10 percent. The technology has great significance for high wet strength waste paper recycling and waste paper regeneration enterprises.
Description
Technical Field
The invention belongs to the technical field of waste paper papermaking and environmental protection, and particularly relates to a method for treating high-wet-strength waste paper with low lignin content and low transition metal content.
Background
As the paper industry has developed, the demand for secondary fibers has increased, and paper made using permanent wet strength resins has been extremely difficult to recycle and utilize. Several wet strength agents commonly used in wet strength paper are melamine resins, novolac resins, polyphthalamide epoxy resins, neoprene latex, chloro-meta resins, and phenolic resins. The resin dissolving agent can soften and disperse the resins under the condition of normal temperature; the degumming agent is prepared by re-oxidizing and modifying softened and dispersed resin glue solution into liquid miscible with water; the sodium hypochlorite bleaching solution is also an oxidation debonding agent for wet strength paper, has a certain effect on the treatment of the waste paper with low-content wet strength agent, can only play an auxiliary role of oxidation resin for high-content wet strength paper, and can improve the whiteness of the treated paper pulp. However, under the pressure of environmental protection, paper mills must reduce the amount of absorbable organic halogen (AOX) produced, thus greatly limiting the use of sodium hypochlorite.
The currently common wet strength agent for papermaking is PAE, and the mechanism of PAE for generating wet strength is generally considered to be that the polyamine epichlorohydrin resin has positive charges and is very easy to be adsorbed to slurry fibers with negative charges, part of epoxy groups and part of hydroxyl groups in cellulose react to generate ether bonds, and the resin is crosslinked into a net structure at a fiber interface, so that the activity among the fibers is limited, the fiber swelling is reduced, and the effect of improving the wet strength of paper is achieved. At present, banknote paper, security paper, kraft paper and the like mostly adopt reactive wet strength agents PAE to attach to the good wet strength of finished paper.
At present, the wet strength paper recycling and repulping process mainly comprises hypochlorite treatment, high-concentration hydraulic pulping, hypochlorite-hydrogen peroxide or two-stage hydrogen peroxide treatment, peroxide-disulfate treatment, two-stage pH value treatment, rotary spherical digester cooking and other measures, but the wet strength paper recycling and repulping process still has the defects of difficult chemical agent permeation, unsatisfactory fiber dissociation, low pulping rate and the like.
Therefore, the invention discloses a method for treating high-wet-strength waste paper with low lignin content and low transition metal content. The method comprises the steps of treating waste paper containing high wet strength by cellulase, peroxide, ozone or microwave to destroy the combination of a wet strength agent, especially a high molecular wet strength agent, and paper fibers, so that the high wet strength paper can be recycled and repulped under the condition that the paper fibers are not damaged or are slightly damaged. The technology is suitable for recycling high-wet-strength waste paper, and is particularly suitable for industrial enterprises for waste paper regeneration.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for treating high wet strength waste paper with low lignin content and low transition metal content, which comprises the steps of carrying out cellulase treatment, peroxide treatment, ozone treatment, microwave treatment and the like on the waste paper with high wet strength to destroy the combination between a wet strength agent, particularly a high molecular wet strength agent, and paper fibers, and realizing the recycling and repulping of the high wet strength paper under the condition of ensuring that the paper fibers are not damaged or are slightly damaged. Wherein the biological enzyme comprises cellulase or hemicellulase, and the peroxide comprises peroxyacid or peroxidized organic matter. The technology is particularly suitable for waste paper recycling industry enterprises.
The invention relates to a method for treating high wet strength waste paper with low lignin content and low transition metal content, which comprises the following steps:
a method for treating high wet strength waste paper with low lignin content and low transition metal content comprises the following steps: the high wet strength waste paper with low lignin and low metal content is treated in a high concentration hydrapulper by physical and chemical treatment modes such as biological enzyme treatment, peroxide treatment, ozone treatment, microwave treatment and the like to destroy the bonding between the wet strength agent and the paper fiber, so that the defibering, fiber dissociation and recycling of the high wet strength paper are realized under the condition that the paper fiber is not destroyed or is hardly destroyed.
Furthermore, the high wet strength waste paper with low lignin and low metal content means that the content of lignin in the paper to be recycled is low, the kappa number is less than or equal to 3.5, the content of transition metals in the paper to be recycled, particularly the content of Fe, cu, mn and Co is less than or equal to 25ppm, or the total content of the transition metals is less than or equal to 50ppm.
Furthermore, the high wet strength waste paper with low lignin and low metal content refers to the paper to be recycled, which is added with a large amount of wet strength agent, wherein the wet strength agent is one or more of melamine resin, urea resin, polyamide epichlorohydrin resin, neoprene latex, chlorine partial resin and phenolic resin.
Further, the high-consistency hydrapulper is a vertical hydrapulper or a drum hydrapulper.
Further, the biological enzyme treatment refers to cellulase treatment or hemicellulase treatment or simultaneous treatment of cellulase and hemicellulase, and the specific treatment method comprises the following steps: the dosage of the cellulase is 0-900 g/ton paper, the dosage of the hemicellulase is 0-1200 g/ton paper, the pH =4.5-9.0, the temperature is 20-60 ℃, the pulp concentration is 5% -20%, and the treatment time is 30-120min.
Further, the peroxide treatment refers to Carnoic acid (peroxysulfuric acid), peroxyacetic acid, peroxyformic acid and their corresponding salts, diacyl peroxide compounds such as dibenzoyl peroxide, dialkyl peroxides such as di-tert-butyl peroxide, cumyl peroxide, etc., and is added singly or in combination. The specific treatment method comprises the following steps: the single or composite peroxide is used in the amount of 0.5-2.5 kg/ton paper, pH =4.0-8.0, temperature 40-100 deg.c, pulp concentration 5-20% and treating time 10-30min.
Further, the ozone treatment, namely the treatment of the paper pulp by using the ozone, comprises the following specific treatment methods: the ozone dosage is 0.1-1.2% (relative to the oven dry paper pulp), the pH is =2.5-4.5, the temperature is 0-40 ℃, the pulp concentration is 15-20%, and the treatment time is 10-30min.
Further, the microwave treatment, that is, the microwave-assisted treatment of the pulp, comprises the following specific treatment methods: the microwave treatment power is 200w-1000w, the treatment time is 2-30min, the temperature is 20-100 ℃, the pH =4.0-9.0, and the pulp concentration is 5-20%.
Furthermore, the method for treating the high-wet-strength waste paper with low lignin and low metal content is one or two of biological enzyme treatment, peroxide treatment, ozone treatment, microwave treatment and the like, and at most, the treatment is not more than 3 of compound synergistic treatment.
Furthermore, the physical and chemical treatment refers to that the treatment of the pulp is carried out on the basis of uniform mixing by a hydrapulper or a drum pulper.
Compared with the prior art, the invention has the following beneficial effects:
the method has the advantages that the bonding between the fibers and the wet strength agent is destroyed through the enzymolysis of biological enzymes, or the bonding between the fibers and the wet strength agent is destroyed through the stronger oxidation potential of peroxide and the oxidation of free radicals (hydroxyl free radicals, superoxide free radicals and the like) possibly generated by the decomposition of the peroxide, or the bonding between the fibers and the wet strength agent is destroyed through the high oxidation potential of ozone molecules and the free radicals generated by the ozone molecules, or the pressure inside fiber cells or among the fiber cells is increased through microwave and microwave heating, so that the bonding strength between the molecules of the wet strength agent and the fibers is weakened, the mass transfer of chemical small molecules among the fibers is enhanced, and the bonding between the wet strength agent and the paper fibers is destroyed through a single treatment and a synergistic treatment mode, so that the disintegration and the fiber dissociation of the high wet strength paper are realized under the condition that the paper fibers are not destroyed or are hardly destroyed. The method for treating the high-wet-strength waste paper with low lignin and low metal content overcomes the potential risk of organic chloride treated by hypochlorite of the existing wet-strength paper, can achieve high-efficiency dissociation of fibers of the wet-strength paper by means of composite or sequential treatment of high-potential oxidation, free radical oxidation, biological enzyme enzymolysis, microwave assistance and the like under the condition of not changing the process and equipment, can achieve a good dissociation effect on the existing commonly-used wet-strength paper in the market, and has the pulping rate of over 90 percent and the reduction rate of the polymerization degree (viscosity) of the fibers of not more than 10 percent. The technology is suitable for recycling high-wet-strength waste paper, and is particularly suitable for industrial enterprises for recycling waste paper.
Drawings
FIG. 1 is a key process flow diagram of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
(1) The high wet strength waste paper is mainly imported American waste paper with polyamide epichlorohydrin resin (PAE) as a wet strength agent.
(2) The PAE high wet strength waste paper, the base paper is mostly bleached pulp, the kappa number of the waste paper is 1.7, the whiteness of the waste paper is 81% ISO, the contents of Fe and Mn in the waste paper are 25ppm and 18ppm respectively, the contents of Fe and Mn in the waste paper are burnt at high temperature for 12 hours, 1mol/L nitric acid is dissolved for 24 hours, and the atomic absorption spectrum is adopted for measurement.
(3) Adding the PAE wet-strength paper into a vertical high-concentration hydrapulper, and adding water to adjust the pulp concentration to 15%.
(4) Adding Novoxil immobilized enzyme in 200 g/ton paper and hemicellulose immobilized enzyme in 200 g/ton paper, preferably xylanase as hemicellulase, adding diluted hydrochloric acid to regulate pH to 6.0, regulating temperature to 40 +/-5 deg.c, concentrating to 15%, rotating speed to 200 +/-25 r/min, and enzyme treating for 60min.
(5) The slurry after enzyme treatment is not washed or concentrated, dilute hydrochloric acid is directly added to adjust the pH value to 3.0, stirring is carried out for 10min, ozone is added into a high-concentration hydrapulper through an ozone generator and a metering pump, the adding amount of the ozone is 0.15% (relative to oven-dried paper pulp), the temperature is 28-30 ℃, the concentration of the slurry is 15%, and the treatment time is 60min.
(6) And when the specified reaction time is reached, discharging the materials by a high-concentration hydrapulper, and completing the dissociation and purification of the high-wet-strength waste paper through the conventional waste paper pulping process flows, such as slag discharge of a slag remover, screening, purification and other processes.
Example 2:
(1) The high wet strength waste paper is mainly imported American waste paper with polyamide epichlorohydrin resin (PAE) and melamine resin as wet strength agents.
(2) The base paper of high wet strength waste paper is mostly bleached softwood/hardwood pulp, the comprehensive kappa number of the waste paper is 1.5, the whiteness of the waste paper is 82% ISO, the contents of Fe, mn and Cu in the waste paper are respectively 20ppm,18ppm and 10ppm, and the contents of metal elements such as Fe, mn and Cu in the waste paper are measured by sequentially burning at high temperature for 12 hours and dissolving in 1mol/L nitric acid for 24 hours and adopting atomic absorption spectroscopy to measure.
(3) And adding the wet-strength paper into a vertical high-concentration hydrapulper, and adding water to adjust the pulp concentration to 15%.
(4) Adding Novoxil immobilized enzyme in 200 g/ton paper and hemicellulose immobilized enzyme in 200 g/ton paper, preferably xylanase as hemicellulase, adding diluted hydrochloric acid to regulate pH to 6.0, regulating temperature to 40 + -5 deg.C, pulp concentration to 15%, rotation speed to 200 + -25 r/min, and enzyme treating for 60min.
(5) And (3) subjecting the slurry subjected to enzyme treatment to microwave-assisted treatment by a microwave generator without washing or concentrating, wherein the microwave treatment power is 800w, the treatment time is 20min, the temperature is 40 +/-5 ℃, and the rotating speed of the hydrapulper is 200 +/-25 r/min.
(6) And (3) adding dilute hydrochloric acid into the treated pulp to adjust the pH value to 3.0, stirring for 10min, and adding ozone into a high-concentration hydrapulper through an ozone generator and a metering pump, wherein the adding amount of the ozone is 0.15% (relative to oven-dried paper pulp), the temperature is 28-30 ℃, the pulp concentration is 15%, and the treatment time is 60min.
(7) And when the specified reaction time is reached, discharging and washing the high-concentration hydrapulper, and completing dissociation and purification of the high-wet-strength waste paper through conventional waste paper pulping process flows, such as slag removal of a slag remover, screening, purification and the like.
Example 3:
(1) The high wet strength waste paper is mainly imported American waste paper with polyamide epichlorohydrin resin (PAE) and melamine resin as wet strength agents.
(2) The raw paper of the high wet strength waste paper is mostly bleached softwood/hardwood pulp, the comprehensive kappa number of the waste paper is 1.5, the whiteness of the waste paper is 82% ISO, the contents of Fe, mn and Cu in the waste paper are respectively 20ppm,18ppm and 10ppm, the contents of metal elements such as Fe, mn, cu and the like in the waste paper are measured by sequentially burning for 12 hours at high temperature and dissolving for 24 hours by 1mol/L nitric acid, and the atomic absorption spectrum is adopted for measurement.
(3) And adding the wet strength paper into a vertical high-concentration hydrapulper, and adding water to adjust the concentration of the pulp to 15%.
(4) Adding Novoxil cellulose curing enzyme in 200 g/ton paper and hemicellulose curing enzyme in 200 g/ton paper, preferably xylanase as hemicellulase, adding dilute hydrochloric acid to regulate pH to 6.0, regulating temperature to 40 +/-5 deg.c, pulp concentration of 15%, rotating speed of hydrapulper to 200 +/-25 r/min, and enzyme treating for 60min.
(5) Adding caustic soda into a paper pulp system after enzyme treatment to adjust the pH value to 5.0, adjusting the temperature of the paper pulp system to 65 +/-5 ℃, adjusting the rotating speed of a hydrapulper to 300 +/-25 r/min, then adding 0.5kg of peroxyacetic acid per ton of paper in a compounding manner, adding 0.5kg of dibenzoyl peroxide per ton of paper, and reacting for 20min.
(6) And when the specified reaction time is reached, discharging and washing the high-concentration hydrapulper, and completing dissociation and purification of the high-wet-strength waste paper through conventional waste paper pulping process flows, such as slag removal of a slag remover, screening, purification and the like.
The effects obtained by the examples are as follows:
| examples of the embodiments | Percentage of formed pulp (%) | Pulp viscosity reduction (%) |
| 1 | 94 | 5％ |
| 2 | 98 | 9％ |
| 3 | 91 | 3％ |
Note: the pulping rate is as follows: screening the dissociated high wet strength pulp for 20min by adopting a vibrating screen with a gap of 0.15mm, wherein the percentage of the pulp fiber passing through the vibrating screen to the dissociated high wet strength pulp is calculated.
Measurement of pulp viscosity: the viscosity of the pulp was measured by a method of GB/T1548-2016 (intrinsic viscosity value in pulp Copper Ethylenediamine (CED) solution).
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (1)
1. A method for treating high wet strength waste paper with low lignin content and low transition metal content is characterized by comprising the following steps: the high wet strength waste paper with low lignin content and low transition metal content is subjected to physicochemical treatment, the combination between a wet strength agent and paper fibers is destroyed, the high wet strength waste paper is recycled and repulped under the condition that the paper fibers are less damaged, and the high-efficiency dissociation of the high wet strength waste paper is realized; the physicochemical treatment comprises enzyme treatment, microwave treatment and ozone treatment in sequence; the treatment method comprises the following specific steps:
1) The high wet strength waste paper is imported American waste paper with polyamide epichlorohydrin resin (PAE) and melamine resin as wet strength agents;
2) The raw material of the high wet strength waste paper is bleached softwood/hardwood pulp, the comprehensive kappa number of the waste paper is 1.5, the whiteness of the waste paper is 82 ISO, the contents of Fe, mn and Cu in the waste paper are respectively 20ppm,18ppm and 10ppm, the content measurement of Fe, mn and Cu metal elements in the waste paper is sequentially burnt at high temperature for 12 hours, 1mol/L nitric acid is dissolved for 24 hours, and the atomic absorption spectrum measurement is adopted;
3) Adding high wet strong waste paper into a vertical high-concentration hydrapulper, adding water to adjust the pulp concentration to 15%;
4) Adding Novoxil immobilized enzyme with the dosage of 200 g/ton paper, hemicellulose immobilized enzyme with the dosage of 200 g/ton paper and xylanase, adding diluted hydrochloric acid to adjust the pH to 6.0, adjusting the temperature to 40 +/-5 ℃, adjusting the pulp concentration to 15%, rotating speed to 200 +/-25 r/min, and carrying out enzyme treatment for 60min;
5) Subjecting the slurry after enzyme treatment to microwave treatment by a microwave generator without washing or concentrating, wherein the microwave treatment power is 800w, the treatment time is 20min, the temperature is 40 +/-5 ℃, and the rotating speed of a hydrapulper is 200 +/-25 r/min;
6) Adding dilute hydrochloric acid into the treated slurry to adjust the pH value to 3.0, stirring for 10min, and adding ozone into a high-concentration hydrapulper through an ozone generator and a metering pump, wherein the using amount of the ozone is 0.15%, the temperature is 28-30 ℃, the concentration of the slurry is 15%, and the treatment time is 60min;
7) And when the specified reaction time is reached, discharging and washing the high-concentration hydrapulper, and completing dissociation and purification of the high-wet-strength waste paper through the conventional waste paper pulping process flow, deslagging by a deslagging device and screening and purifying processes.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5718837A (en) * | 1993-03-12 | 1998-02-17 | Fmc Corporation | Persulfate mixtures for repulping wet strength paper |
| WO2001023665A1 (en) * | 1999-09-28 | 2001-04-05 | Peter Gordon Jobling | Processes and compositions for repulping paper |
| CN103835174A (en) * | 2012-11-27 | 2014-06-04 | 广州瑞辰盛达生物技术有限公司 | Wet-strength waste paper pulping method |
| CN110258159A (en) * | 2019-07-02 | 2019-09-20 | 浙江金龙纸业有限公司 | A kind of pulping process of the strong waste paper of high humidity of low levels of transition metals |
| CN110295508A (en) * | 2019-07-02 | 2019-10-01 | 浙江金龙纸业有限公司 | The processing method of the low strong waste paper of levels of transition metals high humidity of low content of lignin |
-
2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5718837A (en) * | 1993-03-12 | 1998-02-17 | Fmc Corporation | Persulfate mixtures for repulping wet strength paper |
| WO2001023665A1 (en) * | 1999-09-28 | 2001-04-05 | Peter Gordon Jobling | Processes and compositions for repulping paper |
| CN103835174A (en) * | 2012-11-27 | 2014-06-04 | 广州瑞辰盛达生物技术有限公司 | Wet-strength waste paper pulping method |
| CN110258159A (en) * | 2019-07-02 | 2019-09-20 | 浙江金龙纸业有限公司 | A kind of pulping process of the strong waste paper of high humidity of low levels of transition metals |
| CN110295508A (en) * | 2019-07-02 | 2019-10-01 | 浙江金龙纸业有限公司 | The processing method of the low strong waste paper of levels of transition metals high humidity of low content of lignin |
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