CN112281530A - Method for making paper by using straw biogas residues - Google Patents
Method for making paper by using straw biogas residues Download PDFInfo
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- CN112281530A CN112281530A CN202011003492.1A CN202011003492A CN112281530A CN 112281530 A CN112281530 A CN 112281530A CN 202011003492 A CN202011003492 A CN 202011003492A CN 112281530 A CN112281530 A CN 112281530A
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- 238000000034 method Methods 0.000 title claims abstract description 37
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000004537 pulping Methods 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 9
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- 244000098338 Triticum aestivum Species 0.000 claims 1
- 239000002023 wood Substances 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 239000013256 coordination polymer Substances 0.000 description 3
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- LPUQAYUQRXPFSQ-DFWYDOINSA-M monosodium L-glutamate Chemical compound [Na+].[O-]C(=O)[C@@H](N)CCC(O)=O LPUQAYUQRXPFSQ-DFWYDOINSA-M 0.000 description 1
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Images
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
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/023—Cleaning wood chips or other raw materials
-
- 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
- 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
- D21H17/01—Waste products, e.g. sludge
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention relates to a method for manufacturing paper by utilizing straw biogas residues, belonging to the technical field of agricultural waste resource utilization and pulping and papermaking, and the method comprises the following steps: i) cleaning, screening and dedusting the straw biogas residues to obtain purified straw biogas residues; ii) grinding the purified straw biogas residue obtained in the step i) by using a pulping machine to obtain straw biogas residue pulp; iii) mixing the straw biogas residue slurry with water and dissociating the mixture by using a fiber dissociator to obtain homogenized straw biogas residue slurry; and iv) making the homogenized straw biogas residue slurry into paper by using a paper machine. The method realizes resource utilization of the biogas residues, solves the problem of environmental pollution caused by biogas residue discharge, improves the economic benefit of biogas engineering, and provides alternative raw materials for the paper industry taking wood as raw materials.
Description
Technical Field
The invention belongs to the technical field of agricultural waste resource utilization and pulping and papermaking, and particularly relates to a production process for making paper by taking straw biogas residues as raw materials.
Background
The anaerobic fermentation process is one of the most common methods for treating agricultural wastes, particularly straws, but if the fermentation residues cannot be well recycled, the problem of secondary pollution of the residues still exists. The biogas residues generated by anaerobic fermentation process in China each year reach 1.3 hundred million tons, the resource utilization of the biogas residues becomes a great factor restricting the development of biogas engineering at the moment of rapid development of the biogas engineering, the reasonable application of the biological organic matters with large base number is always the focus of attention of researchers in related fields, and the resource high-value utilization of the biogas residues can improve the economic benefit of the biogas engineering and promote the healthy development of industry.
The papermaking industry in China mainly takes wood as a raw material, but China is a country with relatively poor wood raw material, and more than 50% of required paper pulp depends on import. Therefore, the development of non-wood raw materials to replace wood pulp is an effective way for breaking the shortage situation of the paper pulp in China.
The straw biogas residues have the potential of being used as low-grade paper pulp raw materials, and if the straw biogas residues can be applied to the paper making industry, the problems of insufficient paper pulp raw materials, environmental pollution, pressure of biogas biomass energy industry and the like can be relieved to a certain extent.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for manufacturing paper by using straw biogas residues as raw materials, so as to solve the technical problems of resource utilization of biogas residues and development of non-wood raw materials to replace wood pulp. The method of the invention fully utilizes the straw biogas residue which is a resource capable of being secondarily utilized, not only solves the problem of environmental pollution caused by biogas residue discharge to a certain extent, but also improves the economic benefit of biogas engineering, simultaneously can reduce the pressure of forestry, and provides a new thought and technical approach for the papermaking industry.
The object of the present invention and the solution of the technical problem are achieved by the following technical solutions.
In a first aspect, the present invention provides a method for making paper from straw biogas residue, the method comprising the steps of:
i) cleaning, screening and dedusting the straw biogas residues to obtain purified straw biogas residues;
ii) grinding the purified straw biogas residue obtained in the step i) by using a pulping machine to obtain straw biogas residue pulp;
iii) mixing the straw biogas residue slurry with water and dissociating the mixture by using a fiber dissociator to obtain homogenized straw biogas residue slurry; and
iv) making the homogenized straw biogas residue slurry into paper by using a paper machine.
In another aspect, the present invention provides paper made by the above method.
According to the technical scheme, the invention has beneficial technical effects. Specifically, the paper is manufactured by using the straw biogas residues as the raw material, so that the resource utilization of the biogas residues is realized, the problem of environmental pollution caused by biogas residue discharge is solved, the economic benefit of biogas engineering is improved, and meanwhile, an alternative raw material is provided for the paper industry using wood as the raw material.
Drawings
FIG. 1 is a schematic structural view of a formed sheet obtained in example 1 of the present invention.
FIG. 2 is a schematic structural view of a formed sheet obtained in example 2 of the present invention.
FIG. 3 is a schematic structural view of a formed sheet obtained in comparative example 1 of the present invention.
FIG. 4 is a schematic structural view of a formed sheet obtained in example 2 of the present invention in comparison with FIG. 2.
FIG. 5 is a schematic structural view of a formed sheet obtained in example 3 of the present invention.
FIG. 6 is a schematic structural view of a formed sheet obtained in example 3 of the present invention in comparison with 1.
FIG. 7 is a schematic structural view of a formed sheet obtained in example 3 and comparative example 2 of the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments. It will be appreciated by those skilled in the art that the embodiments described below are merely illustrative of the invention and should not be taken as limiting the scope of the invention. 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.
In a first aspect, the present invention provides a method for making paper from straw biogas residue, the method comprising the steps of:
i) cleaning, screening and dedusting the straw biogas residues to obtain purified straw biogas residues;
ii) grinding the purified straw biogas residue obtained in the step i) by using a pulping machine to obtain biogas residue slurry;
iii) mixing the straw biogas residue slurry with water and dissociating the mixture by using a fiber dissociator to obtain homogenized biogas residue slurry; and
iv) making the homogenized biogas residue slurry into paper by using a paper machine.
The biogas residues are semisolid substances remained at the bottom of the biogas digester after biogas fermentation, and the biogas fermentation mainly takes human and animal excreta, crop straws, organic wastewater discharged from large-scale wineries, monosodium glutamate factories, citric acid factories, slaughterhouses and the like as raw materials. The key technology of biogas engineering is biogas anaerobic fermentation technology, which is a process of finally forming combustible mixed gas such as methane, carbon dioxide and the like by decomposing and metabolizing organic substances such as human, livestock and poultry excrement, straws, weeds and the like under certain moisture, temperature and anaerobic conditions through various microorganisms.
Thus, in embodiments of the methods of the present invention, the straw biogas residue used in the methods of the present invention may include biogas residues produced by microbial fermentation of biogas engineering raw materials, including biogas residues produced by microbial fermentation of human and animal excreta, straw, grass, vegetable leaves, crop straws, and the like. In a preferred embodiment of the present invention, the straw biogas residue can be straw biogas residue produced by microbial fermentation of crop straws, such as rice straws, corn straws, wheat straws, sorghum straws, and the like, and a mixture thereof.
In a preferred embodiment of the method of the invention, the straw biogas residue is selected from rice straw biogas residue, corn straw biogas residue, wheat straw biogas residue, sorghum straw biogas residue or a mixture thereof.
i) Cleaning and filtering the straw biogas residue to remove impurities so as to obtain purified straw biogas residue
Biogas residues generated in biogas engineering are remained at the bottom of the biogas digester and often contain impurities such as fine sand, and the impurities can affect the quality of paper. In order to remove impurities such as fine sand and particulate matters in the straw biogas residue to improve the purity and quality of the straw biogas residue, the purified straw biogas residue, namely a paper pulp raw material, needs to be cleaned and filtered.
The washing can be performed by mixing the straw biogas residue with water and stirring uniformly. In an embodiment of the present invention, when cleaning the straw biogas residue, the weight ratio of the straw biogas residue to water may be 1:1-10, such as 1:1, 1:1.5, 1:2, 1:2.5, 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, 1:6, 1:6.5, 1:7, 1:7.5, 1:8, 1:8.5, 1:9, 1:9.5, 1:10, and any ratio between the above two ratios, such as 1:1.1, etc., within the range of the ratio, the better cleaning of the biogas residue can be achieved while saving water.
In embodiments of the invention, the agitation is maintained at 60 to 180r/min for a period of 5 to 20min, e.g., 60r/min, 70r/min, 80r/min, 90r/min, 100r/min, 110r/min, 120r/min, 130r/min, 140r/min, 150r/min, 160r/min, 170r/min, 180r/min, and at a rate between any two of the above speeds, e.g., 65r/min, 75r/min, 85r/min, 95r/min, etc., and the agitation time may be 5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min, 15min, 16min, 17min, 18min, 19min, 20min, and at a rate between any two of the above values, e.g., 5.5min, 6.5min, 7.5min, in the range, the dispersion of the straws can be better realized, and simultaneously, impurities such as sand grains and the like wrapped in the straw pile are separated from the straws.
The cleaned straw biogas residue also contains impurities such as fine yarn, pebble and other particles, and in order to further remove the impurities and improve the purity of the straw biogas residue, the cleaned straw biogas residue is subjected to solid-liquid separation so as to separate the straw biogas residue from the impurities such as water, fine yarn, pebble particles and the like, so that the purified straw biogas residue is obtained. In the embodiment of the present invention, the solid-liquid separation may be performed by using a filter screen.
After cleaning and filtering, purified straw biogas residue, namely the paper pulp raw material, is obtained.
ii) pulping the purified straw biogas residue obtained in the step i) by using a pulping machine to obtain straw biogas residue pulp
Refining is an important step in the papermaking process. During pulping, if the dry weight proportion of the straw biogas residues is too high, the abrasion of blades and a pulp tank of a pulping machine can be caused due to too small straw humidity, and if the dry weight proportion of the straw biogas residues is too low, splashing can be generated due to too large water content, and the obtained pulp is also rough.
Thus, in embodiments of the invention, the feed material, i.e., cleaned straw digestate, is refined at 10% to 30% by dry weight, e.g., 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, and any ratio therebetween, e.g., 10.1%, 10.01%, etc. The dry weight ratio in the above range can reduce the wear on equipment such as a refiner while producing high-quality pulp at the time of refining.
In the invention, the refining speed of the refiner is 1000-. The time can be 2min, 3min, 4min, 5min, 6min, 7min, and a value between any two of the above values, e.g., 2.5min, 3.5 min. The distance between the blades in the refining basin of the refiner and the refining basin is 0.08-0.24mm, such as 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, and values between any two of the above values, such as 0.081mm, 0.082 mm. And circularly refining for at least 2 times.
The straw biogas residue pulp obtained by pulping the straw biogas residue within the pulping time and the pulping interval can obtain better pulping degree, and the pulping outside the range can easily cause the adverse effects of over-coarse pulp, fiber breakage and the like.
Experimental evidence shows that straws with different lengths easily damage a pulping machine and affect the quality of obtained paper pulp, so when the lengths of the biogas residue straws are different or longer, the straws need to be crushed before pulping to ensure that the straws entering the pulping machine keep the length of 1-3 cm. Thus, in an embodiment of the invention, the method of the invention further comprises the step of crushing the cleaned straw biogas residue before refining to obtain straw biogas residue having a straw length of 1-3 cm.
iii) mixing the straw biogas residue slurry with water and dissociating the mixture by a fiber dissociation device to obtain uniform biogas residue slurry
The biogas residue slurry obtained after the straw biogas residue is ground by the pulp grinder is always viscous, at the moment, water is added into the biogas residue slurry for dissociation, the straw biogas residue slurry is favorably dispersed in the water, and the straw biogas residue slurry can be uniformly distributed on a mold in the papermaking process. Thus, in an embodiment of the invention, in step iii), the weight ratio of the dry weight of the straw biogas residue slurry to water when mixed may be in the range of 1:50 to 500, such as 1:50, 1:100, 1:150, 1:200, 1:250, 1:300, 1:350, 1:400, 1:450, 1:500, and any ratio therebetween, such as 1:51, 1: 52.
In the steps, before, during or after mixing the straw biogas residue slurry with water, recycled paper pulp and/or primary pulp can be added and uniformly mixed, and then a fiber dissociator is used for dissociation to obtain uniform mixed slurry. The addition of recycled pulp and/or virgin pulp water facilitates dissociation and uniform mixing. Thus, in an embodiment of the invention, step iii) of the method of the invention further comprises the steps of: before, during or after mixing the straw biogas residue slurry with water, adding recycled paper pulp and/or raw slurry to obtain mixed slurry, and then dissociating by a fiber dissociator to obtain uniform mixed slurry.
The recycled pulp is pulp made by recycling used old waste paper, paper shells and the like. The primary pulp refers to pure primary fiber, and can be wood pulp, straw pulp, cane pulp, cotton pulp and the like according to different sources. In embodiments of the invention, the dry weight ratio of straw pulp to recycled pulp or other virgin pulp may be 9:1 to 5:5, such as 9:1, 8:2, 7:3, 6:4, 5:5, and any ratio therebetween, such as 8.9:1.1, 8.5: 1.5.
In embodiments of the invention, where recycled pulp or other virgin pulp is added, the weight ratio of the dry weight of the mixed pulp to water may be 1:50 to 500, such as 1:50, 1:100, 1:150, 1:200, 1:250, 1:300, 1:350, 1:400, 1:450, 1:500, and any ratio therebetween, such as 1:51, 1: 52.
The fiber dissociators are well known in the art and generally comprise a pulp barrel and a continuously rotating stirring blade arranged in the pulp barrel, wherein the stirring blade continuously stirs to separate and defiber raw pulp fibers in the pulp barrel, so that the fibers in pulp can be separated and defibered without being damaged, the physical properties of finished paper can be improved, and the moisture of the pulp can be reduced. In embodiments of the invention, the rate of dissociation is 2000-4000r/min, e.g., 2000r/min, 2500r/min, 3000r/min, 3500r/min, 4000r/min, and between any two of the above rotational speeds, e.g., 2100r/min, 2110 r/min. Dissociation can be carried out for 1-4min, e.g. 1min, 2min, 3min, 4min, and intermediate values, e.g. 1.5min, 2.5min, 3.5min, preferably 2 min.
iv) making the homogenized straw biogas residue slurry into paper by using a paper machine
Loading the pulp into a paper machine to make paper is known to those skilled in the art and generally comprises loading the homogenized pulp into a paper machine, rapidly dewatering after air-blow agitation, wherein the air-blow agitation time is maintained at 40-70s, vacuum dehumidifying after dewatering for 15-30s, drying and compressing the pulp at high temperature for 4-6min at 500 ℃ to obtain paper.
In another aspect, the invention provides a paper sheet manufactured by the above method, which can be used as a corrugated medium and meets the tensile strength and ring crush index specified in GB/T13023-2008 corrugated medium (primary) paper.
Preferred embodiments of the present invention will be described in detail with reference to the following examples. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents, instruments and the like used in the following examples are commercially available unless otherwise specified.
Example 1 production of paper from corn stalk biogas residue
In this embodiment, the biogas residue is corn stalk residue.
(1) Performing solid-liquid separation on a corn straw biogas residue and biogas slurry mixture discharged from a biogas project using corn straws as a raw material to obtain corn straw biogas residue, fully and uniformly mixing the corn straw biogas residue with water, wherein the weight ratio of the corn straw biogas residue to the water is 1:2, stirring, keeping the stirring speed at 120r/min, and stirring for 10min to disperse the corn straws, and separating sand grains and the like wrapped in the corn straws from the straws. And then carrying out solid-liquid separation on the cleaned corn straw biogas residue by using a filter screen, and removing impurities such as sand, small stones and the like to obtain clean corn straw biogas residue.
(2) The dry weight ratio of the corn straw biogas residue is adjusted to 10% by adding water or drying, and the obtained corn straw biogas residue is ground into slurry by using a pulping machine (IMT-MJ 01 FPI pulping machine, Interson precision instruments Co., Ltd., Dongyan province, China), wherein the grinding gap (the distance between a blade in a pulping tank of the pulping machine and a pulping tank is 0.1 mm), the rotating speed is 1100r/min, and the time is 7min, so that the corn straw biogas residue slurry is obtained.
(3) Mixing the corn straw biogas residue slurry with water at a ratio of 1:150 (weight ratio of dry corn straw biogas residue slurry to water), and dissociating for 4min at a speed of 2000r/min by a fiber dissociator (IMT-SJ 01 standard fiber dissociator of England-Sen precision instruments Co., Ltd., Donggan City) to obtain uniform corn straw biogas residue slurry.
(4) The uniform corn straw biogas residue slurry is made and molded on a paper machine (a paper former is used in the experiment) (IMT-CP 0113 paper former of Intel-Senson precision instrument Co., Ltd., east Aster city), and the raw color paper is obtained after blowing and stirring for 60s, rapid dehydration, vacuum dehumidification for 25s and compression molding at high temperature of 500 ℃ for 5 min.
In this embodiment, if the length of the purified corn straw biogas residue exceeds 3cm, it is pulverized to 1-3cm by a pulverizer before refining, thereby facilitating refining.
Fig. 1 shows a sheet manufactured according to example 1. The tensile strength of the paper was measured according to the measurement of the tensile strength of the paper and the board of GB/T453 (constant rate of loading), and the ring crush strength of the paper was measured according to the measurement of the ring crush strength of the paper and the board of GB/T2679.8 (ring crush index ═ ring crush strength/basis weight). The respective indices are shown in the following table 1.
Table 1: determination of paper-making performance of corn straw biogas residue pulping
As can be seen from Table 1, the paper produced in example 1 meets the requirements of tensile strength and ring crush index specified in GB/T13023-2008 corrugated medium (virgin) paper, and can be used as a corrugated medium.
Example 2: paper made from corn, rice straw and other straw biogas residues
In this embodiment, the biogas residues are mainly corn straw biogas residues and rice straw biogas residues, and a small amount of other biogas residues, such as wheat straw biogas residues.
(1) Performing solid-liquid separation on a biogas residue and biogas slurry mixture discharged from a biogas project which takes corn, rice straw and a small amount of wheat straw as raw materials, fully and uniformly mixing the obtained straw biogas residue with water, wherein the weight ratio of the straw biogas residue to the water is 1:10, stirring, and keeping the stirring speed at 180r/min for 5.5 min. And then carrying out solid-liquid separation on the cleaned straw biogas residues by using a filter screen, and removing impurities such as sand, small stones and the like to obtain clean straw biogas residues.
(2) Grinding the obtained straw biogas residues by using a pulping machine (IMT-MJ 01 FPI pulping machine, Intel precise Instrument Co., Ltd., Dongyan City) to adjust the dry weight ratio of the straw biogas residues to 20%, wherein the grinding gap is 0.22mm, the rotating speed is 4500r/min, and the pulping time is 2.5min, so as to obtain the straw biogas residue pulp.
(3) The obtained straw biogas residue slurry is dissociated for 1.5min at 4000r/min by a fiber dissociator (IMT-SJ 01 standard fiber dissociator of Intel-resistant Send precision instruments Co., Ltd., Donggan City) according to the weight ratio of the dry slurry to water of 1:400, and uniform straw biogas residue slurry is obtained.
(4) Then, the paper is made and formed on a paper machine (IMT-CP 0113 paper former of Intel-Senson precision instruments Limited, Dongyan), and the grey paper is obtained after the paper is subjected to air blowing and stirring for 60s, rapid dehydration, vacuum dehumidification for 25s and compression forming at the high temperature of 500 ℃ for 5 min.
In this embodiment, if the length of the purified straw biogas residue exceeds 3cm, it is pulverized to 1-3cm by a pulverizer before refining, thereby facilitating refining.
Comparative method 1: the refiner had a refining gap of 0.5mm and the other steps were the same as in example 2.
Control method 2: the refiner grinding time was 1min and the other steps were the same as in example 2.
Figures 2-4 show the papers made in example 2 and comparative methods 1 and 2, respectively. The tensile strength of the paper was measured according to the measurement of the tensile strength of the paper and the board of GB/T453 (constant rate of loading), and the ring crush strength of the paper was measured according to the measurement of the ring crush strength of the paper and the board of GB/T2679.8 (ring crush index ═ ring crush strength/basis weight). The indices are shown in table 2 below.
Table 2: paper property measurement by different methods
As can be seen from table 2, when the refining gap and refining time are out of the ranges, the tensile strength and ring crush index of the produced paper will be significantly reduced, thereby making it lower than the standard of corrugated medium and reducing the subsequent utility value.
Example 3 paper is manufactured by using corn straw biogas residue as raw material
In this embodiment, the biogas residue is corn stalk residue.
(1) Performing solid-liquid separation on a biogas residue and biogas slurry mixture discharged by a biogas project using corn straws as a raw material to obtain corn straw biogas residue, fully and uniformly mixing the corn straw biogas residue with water, wherein the weight ratio of the corn straw biogas residue to the water is 1:5, stirring, keeping the stirring speed at 60r/min, and stirring for 18min to disperse the corn straws, and separating sand grains and the like wrapped in the corn straws from the corn straws. And then carrying out solid-liquid separation on the cleaned biogas residues by using a filter screen, and removing impurities such as sand, small stones and the like to obtain clean corn straw biogas residues.
(2) The dry weight ratio of the corn straw biogas residue is adjusted to 25% by adding water or drying, and the obtained corn straw biogas residue is ground into slurry by using a slurry grinder (IMT-MJ 01 FPI slurry grinder, Interson precision instruments Co., Ltd., Donggan City), wherein the grinding gap is 0.16mm, the rotation speed is 1400r/min, and the time is 3.5min, so that the corn straw biogas residue slurry is obtained.
(3) Mixing the corn straw biogas residue pulp and the paper shell recycled paper pulp according to the dry weight ratio of 7:3 to obtain mixed pulp, mixing the mixed pulp with water according to the ratio of 1:500 (the weight ratio of the mixed pulp dry pulp to the water), and dissociating for 3min at the speed of 2000r/min by using a fiber dissociator (IMT-SJ 01 standard fiber dissociator of Intel-Senson precision instruments, Inc., Dongyan).
(4) The uniform mixed pulp is made into paper on a paper machine (IMT-CP 0113 paper former of Intel-Senson precision instruments ltd, Dongyuan), and the grey paper is obtained after air blowing and stirring for 60s, rapid dehydration, vacuum dehumidification for 25s and compression forming at high temperature of 500 ℃ for 5 min.
In this embodiment, if the length of the purified corn straw biogas residue exceeds 3cm, it is pulverized to 1-3cm by a pulverizer before refining, thereby facilitating refining.
Comparative method 1: the corn straw biogas residue pulp and the paper shell recycled pulp are mixed according to the dry weight ratio of 9:1, and other steps are the same as the steps in the example 3.
Control method 2: the corn straw biogas residue slurry and the alkali-treated rice straw slurry are mixed according to the dry weight ratio of 7:3, and other steps are the same as the steps in the example 3.
Fig. 5-7 show the paper made in example 3 and comparative methods 1 and 2, respectively. The tensile strength of the paper was measured according to the measurement of the tensile strength of the paper and the board of GB/T453 (constant rate of loading), and the ring crush strength of the paper was measured according to the measurement of the ring crush strength of the paper and the board of GB/T2679.8 (ring crush index ═ ring crush strength/basis weight). The indices are shown in Table 3.
Table 3: paper property measurement by different methods
As can be seen from Table 3, in comparative example 3 and comparative example 1, as the addition ratio of the recycled pulp is increased, the tensile strength and ring crush index of the paper are also obviously improved; comparing example 3 with control 2, the effect of adding recycled pulp was superior to the effect of adding alkali treated straw pulp.
It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and substitutions may be made by those skilled in the art without departing from the spirit and scope of the invention, and all such modifications and substitutions are intended to be within the scope of the claims.
Claims (10)
1. A method for making paper by using straw biogas residues as raw materials is characterized by comprising the following steps:
i) cleaning, screening and dedusting the straw biogas residues to obtain purified straw biogas residues;
ii) grinding the purified straw biogas residue obtained in the step i) by using a pulping machine to obtain straw biogas residue pulp;
iii) mixing the straw biogas residue slurry with water and dissociating the mixture by using a fiber dissociator to obtain homogenized straw biogas residue slurry; and
iv) making the homogenized straw biogas residue slurry into paper by using a paper machine.
2. The method according to claim 1, wherein the straw biogas residue is a crop straw biogas residue, preferably rice straw biogas residue, corn straw biogas residue, sorghum straw biogas residue, wheat straw biogas residue and mixtures thereof.
3. The method according to claim 1 or 2, characterized in that in step i) the straw biogas residue is washed with water and stirred, the weight ratio of the straw biogas residue to the water is 1:1-10, the stirring speed is 60-180r/min, and the stirring lasts for 5-20 min.
4. The method as claimed in claim 1 or 2, wherein in step ii), the dry weight ratio of the purified straw biogas residue is 10-30%, the refining speed of the refiner is 1000-.
5. The method according to claim 4, wherein step ii) further comprises, before refining, comminuting the cleaned straw biogas residue to obtain straw biogas residue having a straw length of 1-3 cm.
6. The method according to claim 1 or 2, wherein in step iii), the weight ratio of the dry weight of the straw biogas residue slurry to water is 1: 50-500.
7. The method according to claim 1 or 2, wherein step iii) further comprises adding recycled pulp and/or virgin pulp to obtain a mixed pulp before, during or after mixing the straw biogas residue slurry with water.
8. The method of claim 7, wherein the dry weight ratio of straw biogas residue slurry to recycled pulp and/or other virgin pulp can be 9:1 to 5: 5.
9. The method of claim 7, wherein the dry weight of the mixed pulp is in a ratio of 1:50-500 to water, and the dissociation time is 3-7 min.
10. A paper sheet made by the method of claims 1-9, wherein the paper sheet is used as a corrugating medium.
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