CN113481750A - Pulping process with good slag removal effect - Google Patents
Pulping process with good slag removal effect Download PDFInfo
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- CN113481750A CN113481750A CN202110847473.5A CN202110847473A CN113481750A CN 113481750 A CN113481750 A CN 113481750A CN 202110847473 A CN202110847473 A CN 202110847473A CN 113481750 A CN113481750 A CN 113481750A
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- pulp
- deslagging
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- 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
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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
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/08—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags
- D21B1/10—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags by cutting actions
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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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- 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
- 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
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
The invention relates to the technical field of corrugated paper, in particular to a pulping process with good slag removal effect, which comprises the following steps: softening the waste paper and pulping to obtain primary pulp; separating to obtain short fiber slurry, medium fiber slurry and long fiber slurry; deslagging short fiber pulp, medium fiber pulp and long fiber pulp respectively, and grinding the deslagging medium fiber pulp and long fiber pulp respectively; according to the invention, before pulping, the waste paper is softened, the fiber loss is less in the pulping process, the obtained useful fibers are less, the primary pulp is divided into three kinds of pulp of coarse fibers, medium fibers and long fibers, and the three kinds of pulp are subjected to deslagging operation respectively by using corresponding deslagging devices, so that the deslagging pertinence is stronger, and each kind of pulp is provided with at least three deslagging devices for deslagging sequentially, and the deslagging effect is better; and different pulping modes are adopted according to the properties of the medium fiber pulp and the long fiber pulp, so that the pulping effect is better.
Description
Technical Field
The invention relates to the technical field of corrugated paper, in particular to a pulping process with a good slag removal effect.
Background
China is the first pulping and papermaking producing country in the world, but forest resources in China are relatively deficient, fiber resources used for pulping and papermaking are seriously insufficient, and in order to solve the problem of shortage of fiber resources in China, a large amount of non-wood fibers such as wheat straw, bagasse and the like are adopted for pulping and papermaking; still develop waste paper recycle technique vigorously, carry out effectual recycle to waste paper, not only avoid a large amount of waste paper rubbish polluted environment, help practicing thrift valuable forest resources moreover, reduce the destruction to the environment. However, in the prior art, the deslagging effect in pulping is poor, and the fiber loss in the pulping process is large.
Disclosure of Invention
The invention aims to provide a pulping process with good deslagging effect, and aims to solve the problems in the background art.
The invention is realized in this way, a pulping process with good deslagging effect, comprising the following procedures:
(1) crushing the recovered waste paper into blocks, putting the block waste paper and clean water into a first reaction kettle according to the weight ratio of 1:300, adding 0.13-0.23 wt% of pectinase and 0.4-0.6 wt% of calcium oxide into the first reaction kettle, wherein the weight ratio of the clean water to the block waste paper is 300:1, heating to 50-60 ℃, softening the block waste paper at low temperature, then sending the block waste paper into a pulper for pulping to obtain primary pulp, and pre-removing residues from the primary pulp;
(2) sequentially separating the primary pulp after deslagging by a classifier to respectively obtain short fiber pulp, medium fiber pulp and long fiber pulp;
(3) the short fiber pulp is sequentially subjected to deslagging through at least three short fiber deslagging devices, the slag generated by the short fiber deslagging device positioned at the next stage is returned to the short fiber deslagging device positioned at the previous stage for secondary deslagging, and finally obtained short fiber good pulp is sent to a short fiber pulp pool for standby through circulation;
(4) deslagging the medium fiber pulp in sequence through at least three medium fiber deslagging devices, returning slag generated by the medium fiber deslagging device positioned at the next stage to the medium fiber deslagging device positioned at the previous stage for secondary deslagging, and sending the medium fiber good pulp obtained through deslagging by the medium fiber deslagging device to a medium fiber disc mill for coarse grinding; conveying the coarse-ground fine medium fiber pulp into a second reaction kettle, adding clear water into the reaction kettle, and performing secondary softening treatment on the coarse-ground fine medium fiber pulp at the temperature of 70-80 ℃ in the reaction kettle; finally, fine grinding is carried out on the secondary softened medium fiber fine pulp, and medium fiber pulp after fine grinding is sent to a medium fiber pulp pool for standby;
(5) deslagging the medium fiber slurry in sequence by at least three long fiber deslagging devices, returning slag generated by the long fiber deslagging device positioned at the next stage to the long fiber deslagging device positioned at the previous stage for secondary deslagging, and coarsely grinding the fine long fiber slurry obtained by deslagging through the long fiber deslagging device; and conveying the coarsely ground long fiber pulp to a thermal dispersion pulp grinding position for secondary pulp grinding, wherein the temperature of the thermal dispersion high-concentration pulp grinding position is 95-105 ℃, the operating clearance of a thermal dispersion grinding disc is 0.3-1.5 mm, and finally conveying the secondarily ground long fiber pulp to a long fiber pulp pool for later use.
Further, the pre-deslagging in the working procedure (1) comprises the steps of performing one-stage pre-deslagging and two-stage pre-deslagging on the primary pulp.
Furthermore, the time of the softening treatment in the step (1) is 1h-2 h.
Furthermore, the two classifiers in the step (2) are provided, the two classifiers are used for sequentially separating fibers from the primary pulp, the classifier located at the previous stage is used for separating short fiber pulp, and the classifier located at the next stage is used for separating the primary pulp after the short fiber pulp is separated again, so as to obtain middle fiber pulp and long fiber pulp.
Furthermore, the time of the secondary softening treatment in the step (4) is 2h-3 h.
Compared with the prior art, the invention has the beneficial effects that: before pulping, waste paper is softened, fiber loss is smaller in the pulping process, the obtained useful fibers are fewer, the primary pulp is divided into three kinds of pulp of coarse fibers, medium fibers and long fibers, and corresponding slag removers are used for performing slag removal operation on the three kinds of pulp respectively, the pertinence of slag removal is higher, and each kind of pulp is provided with at least three slag removers for removing slag in sequence, so that the slag removal effect is better; and different pulping modes are adopted according to the properties of the medium fiber pulp and the long fiber pulp, so that the pulping effect is better.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
Example one
A pulping process with good deslagging effect comprises the following steps:
(1) crushing the recycled waste paper into blocks, putting the block waste paper and clean water into a first reaction kettle according to the weight ratio of 1:300, adding 0.13 wt% of pectinase and 0.4 wt% of calcium oxide into the first reaction kettle, wherein the weight ratio of the clean water to the block waste paper is 300:1, heating to 50 ℃, softening the block waste paper at a low temperature for 1h, then sending the block waste paper into a pulper for pulping to obtain primary pulp, and pre-removing residues from the primary pulp; because the used paper is softened before pulping, less fiber is lost during pulping and less useful fiber is obtained.
(2) Sequentially separating the primary pulp after deslagging by a classifier to respectively obtain short fiber pulp, medium fiber pulp and long fiber pulp;
(3) the short fiber pulp is sequentially subjected to deslagging through at least three short fiber deslagging devices, the slag generated by the short fiber deslagging device positioned at the next stage is returned to the short fiber deslagging device positioned at the previous stage for secondary deslagging, and finally obtained short fiber good pulp is sent to a short fiber pulp pool for standby through circulation;
(4) deslagging the medium fiber pulp in sequence through at least three medium fiber deslagging devices, returning slag generated by the medium fiber deslagging device positioned at the next stage to the medium fiber deslagging device positioned at the previous stage for secondary deslagging, and sending the medium fiber good pulp obtained through deslagging by the medium fiber deslagging device to a medium fiber disc mill for coarse grinding; conveying the coarse-ground fine medium fiber pulp into a second reaction kettle, adding clear water into the reaction kettle, and carrying out secondary softening treatment on the coarse-ground fine medium fiber pulp for 2 hours at the temperature of 80 ℃ in the reaction kettle; finally, fine grinding the well-quality medium fiber pulp after the secondary softening, and then sending the well-quality medium fiber pulp to a medium fiber pulp tank for later use;
(5) deslagging the medium fiber slurry in sequence by at least three long fiber deslagging devices, returning slag generated by the long fiber deslagging device positioned at the next stage to the long fiber deslagging device positioned at the previous stage for secondary deslagging, and coarsely grinding the fine long fiber slurry obtained by deslagging through the long fiber deslagging device; and sending the coarsely ground long fiber pulp to a thermal dispersion pulp grinding position for secondary pulp grinding, wherein the temperature of the thermal dispersion high-concentration pulp grinding position is 95 ℃, the operating clearance of a thermal dispersion grinding disc is 1.5mm, and finally sending the secondarily ground long fiber pulp to a long fiber pulp pool for later use.
Wherein, the pre-deslagging in the working procedure (1) comprises the steps of performing first-stage pre-deslagging and second-stage pre-deslagging on the primary pulp. The two classifiers in the step (2) are used for sequentially separating fibers from the primary pulp, the classifier positioned at the previous stage is used for separating short fiber pulp, and the classifier positioned at the next stage is used for separating the primary pulp from which the short fiber pulp is separated again so as to obtain the medium fiber pulp and the long fiber pulp.
Example two
A pulping process with good deslagging effect comprises the following steps:
(1) crushing the recycled waste paper into blocks, putting the block waste paper and clean water into a first reaction kettle according to the weight ratio of 1:300, adding 0.23 wt% of pectinase and 0.4 wt% -calcium oxide into the first reaction kettle, wherein the weight ratio of the clean water to the block waste paper is 300:1, heating to 50 ℃, softening the block waste paper at a low temperature for 2 hours, then sending the block waste paper into a pulper for pulping to obtain primary pulp, and pre-removing residues from the primary pulp; because the used paper is softened before pulping, less fiber is lost during pulping and less useful fiber is obtained.
(2) Sequentially separating the primary pulp after deslagging by a classifier to respectively obtain short fiber pulp, medium fiber pulp and long fiber pulp;
(3) the short fiber pulp is sequentially subjected to deslagging through at least three short fiber deslagging devices, the slag generated by the short fiber deslagging device positioned at the next stage is returned to the short fiber deslagging device positioned at the previous stage for secondary deslagging, and finally obtained short fiber good pulp is sent to a short fiber pulp pool for standby through circulation;
(4) deslagging the medium fiber pulp in sequence through at least three medium fiber deslagging devices, returning slag generated by the medium fiber deslagging device positioned at the next stage to the medium fiber deslagging device positioned at the previous stage for secondary deslagging, and sending the medium fiber good pulp obtained through deslagging by the medium fiber deslagging device to a medium fiber disc mill for coarse grinding; conveying the coarse-ground fine medium fiber pulp into a second reaction kettle, adding clear water into the reaction kettle, and carrying out secondary softening treatment on the coarse-ground fine medium fiber pulp for 3 hours, wherein the temperature in the reaction kettle is 70 ℃; finally, fine grinding the well-quality medium fiber pulp after the secondary softening, and then sending the well-quality medium fiber pulp to a medium fiber pulp tank for later use;
(5) deslagging the medium fiber slurry in sequence by at least three long fiber deslagging devices, returning slag generated by the long fiber deslagging device positioned at the next stage to the long fiber deslagging device positioned at the previous stage for secondary deslagging, and coarsely grinding the fine long fiber slurry obtained by deslagging through the long fiber deslagging device; and sending the coarsely ground long fiber pulp to a thermal dispersion pulp grinding position for secondary pulp grinding, wherein the temperature of the thermal dispersion high-concentration pulp grinding position is 95 ℃, the operating clearance of a thermal dispersion grinding disc is 0.3mm, and finally sending the secondarily ground long fiber pulp to a long fiber pulp pool for later use.
Wherein, the pre-deslagging in the working procedure (1) comprises the steps of performing first-stage pre-deslagging and second-stage pre-deslagging on the primary pulp. The two classifiers in the step (2) are used for sequentially separating fibers from the primary pulp, the classifier positioned at the previous stage is used for separating short fiber pulp, and the classifier positioned at the next stage is used for separating the primary pulp from which the short fiber pulp is separated again so as to obtain the medium fiber pulp and the long fiber pulp.
Aiming at the first embodiment and the second embodiment, the primary pulp is divided into three kinds of pulp, namely coarse fiber pulp, medium fiber pulp and long fiber pulp, and the three kinds of pulp are subjected to deslagging operation respectively by using corresponding deslagging devices, so that the deslagging pertinence is higher, each kind of pulp is provided with at least three deslagging devices for deslagging sequentially, and the deslagging effect is better; and different pulping modes are adopted according to the properties of the medium fiber pulp and the long fiber pulp, so that the pulping effect is better.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The pulping process with good deslagging effect is characterized by comprising the following steps:
(1) crushing the recovered waste paper into blocks, putting the block waste paper and clean water into a first reaction kettle according to the weight ratio of 1:300, adding 0.13-0.23 wt% of pectinase and 0.4-0.6 wt% of calcium oxide into the first reaction kettle, wherein the weight ratio of the clean water to the block waste paper is 300:1, heating to 50-60 ℃, sending the block waste paper into a pulper for pulping after low-temperature softening treatment to obtain primary pulp, and pre-removing residues from the primary pulp;
(2) sequentially separating the primary pulp after deslagging by a classifier to respectively obtain short fiber pulp, medium fiber pulp and long fiber pulp;
(3) the short fiber pulp is sequentially subjected to deslagging through at least three short fiber deslagging devices, the slag generated by the short fiber deslagging device positioned at the next stage is returned to the short fiber deslagging device positioned at the previous stage for secondary deslagging, and finally obtained short fiber good pulp is sent to a short fiber pulp pool for standby through circulation;
(4) deslagging the medium fiber pulp in sequence through at least three medium fiber deslagging devices, returning slag generated by the medium fiber deslagging device positioned at the next stage to the medium fiber deslagging device positioned at the previous stage for secondary deslagging, and sending the medium fiber good pulp obtained through deslagging by the medium fiber deslagging device to a medium fiber disc mill for coarse grinding; conveying the coarse-ground fine medium fiber pulp into a second reaction kettle, adding clear water into the reaction kettle, and performing secondary softening treatment on the coarse-ground fine medium fiber pulp at the temperature of 70-80 ℃ in the reaction kettle; finally, fine grinding is carried out on the secondary softened medium fiber fine pulp, and medium fiber pulp after fine grinding is sent to a medium fiber pulp pool for standby;
(5) deslagging the medium fiber slurry in sequence by at least three long fiber deslagging devices, returning slag generated by the long fiber deslagging device positioned at the next stage to the long fiber deslagging device positioned at the previous stage for secondary deslagging, and coarsely grinding the fine long fiber slurry obtained by deslagging through the long fiber deslagging device; and conveying the coarsely ground long fiber pulp to a thermal dispersion pulp grinding position for secondary pulp grinding, wherein the temperature of the thermal dispersion high-concentration pulp grinding position is 95-105 ℃, the operating clearance of a thermal dispersion grinding disc is 0.3-1.5 mm, and finally conveying the secondarily ground long fiber pulp to a long fiber pulp pool for later use.
2. The pulping process with good deslagging effect according to claim 1, wherein the preliminary deslagging in the procedure (1) comprises performing primary preliminary deslagging and secondary preliminary deslagging on the primary pulp.
3. The pulping process with good deslagging effect according to claim 1, wherein the softening time in the working procedure (1) is 1h-2 h.
4. The pulping process with good deslagging effect as claimed in claim 1, wherein the two classifiers in the step (2) are provided, the two classifiers are used for sequentially separating fibers from the primary pulp, the classifier located at the previous stage is used for separating short fiber pulp, and the classifier located at the next stage is used for separating the primary pulp after the short fiber pulp is separated again, so as to obtain middle fiber pulp and long fiber pulp.
5. The pulping process with good deslagging effect according to claim 1, wherein the secondary softening time in the working procedure (4) is 2h-3 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110847473.5A CN113481750B (en) | 2021-07-26 | 2021-07-26 | Pulping process with good slag removal effect |
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| CN202110847473.5A CN113481750B (en) | 2021-07-26 | 2021-07-26 | Pulping process with good slag removal effect |
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| CN113481750B CN113481750B (en) | 2023-03-14 |
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| CN105586797A (en) * | 2014-10-20 | 2016-05-18 | 刘振宇 | Wastepaper recycling regeneration paperboard process |
| CN106436430A (en) * | 2015-08-11 | 2017-02-22 | 玖龙纸业(天津)有限公司 | High-strength kraft linerboard manufacturing method |
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