CN113502678B - Low-concentration heavy-weight deslagging method for kraft cardboard OCC slurry - Google Patents
Low-concentration heavy-weight deslagging method for kraft cardboard OCC slurry Download PDFInfo
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- CN113502678B CN113502678B CN202110717848.6A CN202110717848A CN113502678B CN 113502678 B CN113502678 B CN 113502678B CN 202110717848 A CN202110717848 A CN 202110717848A CN 113502678 B CN113502678 B CN 113502678B
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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
- 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
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- 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 relates to a low-concentration heavy-weight slag removal method for craft paper OCC slurry, which comprises the following steps: the OCC slurry is crushed, sieved roughly, classified into short fiber, medium fiber and long fiber by a classifying screen, and added with diluted white water respectively to remove slag. The mass of the final solid waste is 0.008% -0.01% of that of the OCC slurry, the ash content of the solid waste is 90-95%, and the slag discharge rate is 0.02-0.035%.
Description
Technical Field
The invention relates to the field of papermaking, and particularly relates to a low-concentration heavy-weight deslagging method for kraft liner OCC slurry.
Background
The low-concentration heavy slag remover is conventional pulping and papermaking production equipment, and has the working principle that slurry enters a slag remover cone from a slurry inlet head of a conical low-concentration slag remover in the tangential direction to form vortex, heavy impurities lean against the wall of the slag remover under the action of centrifugal force and finally fall to the bottom of the lower cone of the slag remover, are discharged from a slag discharge nozzle at the bottom of the lower cone of the slag remover, and are connected with a slag discharge main pipe by using a glass slag pipe; the pressure in the center of the vortex is reduced, and the accepted pulp is promoted to rise from the center of the vortex and is discharged from the accepted pulp opening of the slag separator. Through the technological process, the fine and heavy impurities such as glass slag, fine sand, small metal particles and the like are removed, and the effect of purifying the slurry is achieved.
The conventional deslagging rate of the OCC waste paper pulp low-concentration heavy slag removal section is 0.05-0.06%, the tail slag ash content of the tail section is 55-60%, and the low-concentration heavy tail slag is used as solid waste and is burnt by a power transmission plant so as to meet the requirement of environmental protection treatment. Therefore, a novel low-concentration heavy slag removal process is developed and applied to production of the craft paper, slag removal is effectively reduced, the ash content of tailings is improved, solid waste is reduced, the consumption of raw materials is reduced, and environmental protection and economic benefits are improved.
Disclosure of Invention
Therefore, the inventor provides a low-concentration heavy-weight deslagging method for kraft cardboard OCC slurry, the final mass of solid waste is 0.008% -0.01% of the mass of the OCC slurry, the ash content of the solid waste is 90-95%, and the deslagging rate is 0.02-0.035%.
The low-concentration heavy-weight deslagging method for the craft paper OCC slurry comprises the following steps: the OCC slurry is crushed, sieved and classified into short fiber, medium fiber and long fiber, and diluted white water is added separately for eliminating slag
Short fiber deslagging: three-stage deslagging is adopted, a deslagging device is adopted for short fiber first-stage deslagging, and deslagging is carried out by adopting a deslagging device and a slurry saving device for short fiber second-stage deslagging and short fiber third-stage deslagging;
removing slag from the medium fiber: three-stage deslagging is adopted, a deslagging device is adopted for medium fiber first-stage deslagging, and a deslagging device and a slurry saving device are adopted for medium fiber second-stage deslagging and medium fiber third-stage deslagging;
deslagging long fibers, namely deslagging by adopting a five-section mode, deslagging by adopting a deslagging device for deslagging the first section of long fibers, deslagging by adopting a second section of long fibers, deslagging by adopting a third section of long fibers, deslagging by adopting a fourth section of long fibers, deslagging by adopting a deslagging device and a slurry saving device for deslagging by adopting the fifth section of long fibers; obtaining tailings;
the pulp saver is arranged on the slag remover and is connected with washing white water.
Further, the short fiber deslagging comprises the following steps:
short fiber first-stage deslagging: adding the short fiber into the diluted white water, and then removing the slag by using a short fiber first-stage slag remover, wherein the pulp inlet concentration of the short fiber first-stage slag remover is as follows: 1.0-1.3%, short fiber first-stage pulp inlet pressure: 220-250kpa, feeding short fiber into the pulp at one section, and reducing the good pulp pressure: 130-150kpa, first-stage short fiber slag discharge pressure: 80-110kpa, first-stage slag concentration of short fiber: 2.5 to 3.0 percent;
short fiber two-stage deslagging: adding the residue obtained after the primary short fiber residue removal into diluted white water, and removing the residue by using a short fiber secondary residue remover provided with a short fiber secondary pulp saver; wherein the pulp inlet concentration of the short fiber two-stage slag remover is as follows: 1.0-1.3%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.0 to 3.2 percent; adding elutriation white water into the short fiber two-stage festival pulp machine, the dilute water pressure of the short fiber two-stage festival pulp machine is 140-200kpa, the dilute water flow of the short fiber two-stage festival pulp machine is 50-60L/min;
short fiber three-stage deslagging: adding the residue obtained after the short fiber two-stage deslagging into diluted white water, and deslagging by using a short fiber three-stage deslagging device provided with a short fiber three-stage pulp saver; wherein the pulp inlet concentration of the short fiber three-section slag remover is as follows: 0.7-0.8%, slurry feeding pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.4-3.0%; elutriation white water is added into the three-section pulp saver, the dilution water pressure of the short fiber three-section pulp saver is 140-200kpa, and the dilution water flow of the short fiber three-section pulp saver is 50-60L/min.
Further, the primary short fiber deslagging rate is 22-25%; the short fiber two-stage deslagging rate is 25-30%; the three-stage deslagging rate of the short fiber is 30-35%.
Furthermore, the actual power consumption of the short fiber I, the short fiber II and the short fiber III for deslagging is summed up: 14.0-15.0kwh/t pulp.
Further, the medium fiber deslagging comprises the following steps:
removing slag at the middle fiber section: adding the medium fiber into the diluted white water, and then removing the slag by using a medium fiber first-stage slag remover, wherein the pulp inlet concentration of the medium fiber first-stage slag remover is as follows: 1.0-1.3%, and the pulp inlet pressure of the middle fiber section: 220-250kpa, feeding pulp into the middle fiber section, and reducing the pressure of good pulp: 130-150kpa, medium fiber first-stage deslagging pressure: 60-90kpa, slag concentration of the medium fiber section: 2.5 to 3.0 percent;
removing slag from the medium fiber in the second stage: adding the residue obtained after primary deslagging of the medium fiber into diluted white water, and deslagging by using a medium fiber secondary deslagging device provided with a medium fiber secondary pulp saver; wherein the pulp inlet concentration of the medium fiber two-stage slag separator is as follows: 1.1-1.3%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.0 to 3.5 percent; the elutriation white water is connected into the medium fiber two-stage pulp saver, the pressure of the dilution water of the medium fiber two-stage pulp saver is 140-200kpa, and the flow of the dilution water of the medium fiber two-stage pulp saver is 50-60L/min;
medium fiber three-stage deslagging: adding the residue obtained after medium fiber two-stage deslagging into diluted white water, and deslagging by using a medium fiber three-stage deslagging device provided with a medium fiber three-stage pulp saver; wherein the pulp inlet concentration of the medium fiber three-section slag separator is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.3 to 3.0 percent; elutriation white water is added into the three-section pulp saver, the pressure of the dilution water of the medium fiber three-section pulp saver is 140-200kpa, and the flow of the dilution water of the medium fiber three-section pulp saver is 50-60L/min.
Further, the slag removal rate of the first section of the medium fiber is 22-26%; the slag removal rate of the secondary medium fiber section is 28-32%; the medium fiber three-stage deslagging rate is 30-38%.
Furthermore, the actual power consumption of medium fiber I, second and third sections of deslagging is summed: 18.0-20.0kwh/t pulp.
Further, the long fiber deslagging comprises the following steps:
removing slag at a long fiber section: adding the long fibers into the diluted white water, and then removing the slag by using a long fiber first-stage slag remover, wherein the pulp inlet concentration of the long fiber first-stage slag remover is as follows: 1.1-1.4%, the pulp inlet pressure of the long fiber section: 330-350kpa, feeding the long fiber into the pulp at one section, and reducing the pressure of the good pulp: 130-150kpa, long fiber first-stage deslagging pressure: 110-120kpa, slag concentration of long fiber at one section: 3.2 to 3.6 percent;
removing slag in a long fiber two-stage process: adding the residue obtained after the long fiber primary section deslagging into diluted white water, and deslagging by using a long fiber secondary section deslagging device provided with a long fiber secondary section pulp saver; wherein the pulp inlet concentration of the long fiber two-stage slag remover is as follows: 1.1-1.3%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.0 to 3.5 percent; the elutriation white water is connected into the long fiber two-stage pulp saver, the dilution water pressure of the long fiber two-stage pulp saver is 140-200kpa, and the dilution water flow of the long fiber two-stage pulp saver is 50-60L/min;
removing slag in three sections of long fibers: adding the residue obtained after the long fiber two-stage deslagging into diluted white water, and deslagging by using a long fiber three-stage deslagging device provided with a long fiber three-stage pulp saver; wherein the pulp inlet concentration of the long-fiber three-section slag remover is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.5-3.0%, the diluting water pressure of the long fiber three-section slurry saver is 140-200kpa, and the diluting water flow of the long fiber three-section slurry saver is 50-60L/min;
removing slag in four sections of long fibers: adding the residue obtained after long fiber three-stage deslagging into diluted white water, and deslagging by using a long fiber four-stage deslagging device provided with a long fiber four-stage pulp saver; wherein, the pulp inlet concentration of the long-fiber four-section slag remover is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.8-4.0%, the diluting water pressure of the long fiber four-section pulp saver is 140-200kpa, and the diluting water flow of the long fiber four-section pulp saver is 50-60L/min;
removing slag in five long fiber sections: adding the residue obtained after removing the residue in the four sections of the long fiber into the diluted white water, and removing the residue by using a long fiber five-section residue remover provided with a long fiber five-section slurry saver; wherein the pulp inlet concentration of the long-fiber five-section slag separator is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.5 to 3.0 percent; the washing white water is connected into the five-section pulp saver, the pressure of the dilution water of the long-fiber five-section pulp saver is 140-200kpa, and the flow of the dilution water of the long-fiber five-section pulp saver is 50-60L/min.
Further, the slag removal rate of the long fiber section is 25-28%; the long fiber two-stage deslagging rate is 28-32%; the long fiber three-stage deslagging rate is 32-36%; the slag removal rate of the four sections of the long fibers is 40-45%; the slag removal rate of the five long fiber sections is 50-55%, and the ash content of tailings obtained after slag removal of the five long fiber sections is 68-70%.
Furthermore, the actual power consumption of the long fiber I, II, III, IV and V sections of low-concentration heavy slag removal is summed: 25-27kwh/t pulp.
Further, the method also comprises the following steps:
and (3) putting tailings obtained after five sections of long fibers are subjected to slag removal into a sand settling channel, performing solid-liquid separation, recovering white water at the upper part, and incinerating solid waste at the lower part.
Further, the mass of the solid waste is 0.008% -0.01% of that of the OCC slurry, and the ash content of the solid waste is 90% -95%.
Further, the deslagging rate of the kraft paper OCC slurry low-concentration heavy-weight deslagging method is 0.02-0.035%.
Further, the power consumption of the OCC slurry low-concentration heavy slag remover is as follows: 19-20kwh/t pulp.
Compared with the prior art, the technical scheme provides the craft paper OCC slurry low-concentration heavy-mass deslagging method, the method is simple and easy to popularize, the final solid waste mass is 0.008% -0.01% of the OCC slurry mass, the solid waste ash content is 90% -95%, the deslagging rate is 0.02% -0.035%, the OCC raw material is saved, and the method has high environmental protection benefit and economic benefit. By adopting the novel process, the craft paper can save OCC waste paper raw materials by about 25-30kg/t paper, reduce emission of low-concentration tailing solid waste by about 25-30kg/t paper, the yield of the craft paper of a company is about 150 ten thousand tons/year, the waste paper raw materials can be saved by about 3.75-4.5 ten thousand tons/year, the emission of low-concentration heavy tailing solid waste is reduced by about 3.75-4.5 ten thousand tons/year, and the environment-friendly benefit and the economic benefit are good.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments.
In the embodiment, the slurry saver is a ceramic cone, the upper part of the slurry saver is connected with the ceramic lower cone of the slag remover, the side surface of the slurry saver is provided with a connecting port for dilution water, and the dilution water enters the slurry saver along a tangent line, so that the concentration of slurry is reduced, the vortex strength is enhanced, and the elutriation effect is achieved. The slurry saver can effectively improve the separation efficiency of fibers and heavy impurities and effectively reduce the discharge of useful fibers along with tailings.
Embodiment 1 low-concentration heavy-weight deslagging method for kraft liner OCC slurry
The OCC slurry is crushed, sieved and classified into short fiber, medium fiber and long fiber, and white water is added separately for eliminating slag
1. Short fiber deslagging: three-stage deslagging is adopted, a deslagging device is adopted for short fiber first-stage deslagging, and deslagging is carried out by adopting a deslagging device and a slurry saving device for short fiber second-stage deslagging and short fiber third-stage deslagging;
short fiber first-stage deslagging: adding the short fiber into the diluted white water, and then removing the slag by using a short fiber first-stage slag remover, wherein the pulp inlet concentration of the short fiber first-stage slag remover is as follows: 1.18 percent, short fiber first-stage pulp inlet pressure: 220-250kpa, feeding short fiber into the pulp at one section, and reducing the good pulp pressure: 130-150kpa, first-stage short fiber slag discharge pressure: 80-110kpa, first-stage slag concentration of short fiber: 2.72 percent; the primary deslagging rate of the short fibers is 23%;
short fiber two-stage deslagging: adding the residue obtained after the primary short fiber residue removal into diluted white water, and removing the residue by using a short fiber secondary residue remover provided with a short fiber secondary pulp saver; wherein the pulp inlet concentration of the short fiber two-stage slag remover is as follows: 1.11%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.12 percent; the elutriation white water is connected into the short fiber two-stage pulp saver, the dilution water pressure of the short fiber two-stage pulp saver is 140-200kpa, and the dilution water flow of the short fiber two-stage pulp saver is 50-60L/min; the slag removal rate of the short fiber second section is 28 percent;
short fiber three-stage deslagging: adding the residue obtained after the short fiber two-stage deslagging into diluted white water, and deslagging by using a short fiber three-stage deslagging device provided with a short fiber three-stage pulp saver; wherein the pulp inlet concentration of the short fiber three-section slag remover is as follows: 0.71%, slurry feed pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.41 percent; elutriation white water is added into the three-section pulp saver, the dilution water pressure of the short fiber three-section pulp saver is 140-200kpa, and the dilution water flow of the short fiber three-section pulp saver is 50-60L/min. The three-stage deslagging rate of the short fiber is 34 percent.
The table for detecting the concentration of the short fiber deslagging three-stage slurry is shown in the following table 1:
TABLE 1 short fiber residue-removing pulp sample detecting table
2. Removing slag from medium fiber: three-stage deslagging is adopted, a deslagging device is adopted for medium fiber first-stage deslagging, and a deslagging device and a slurry saving device are adopted for medium fiber second-stage deslagging and medium fiber third-stage deslagging; the pulp saver is arranged on the slag remover and is connected with washing white water.
Removing slag at the middle fiber section: adding the medium fiber into the diluted white water, and then removing the slag by using a medium fiber first-stage slag remover, wherein the medium fiber first-stage slag remover enters the pulp concentration: 1.08 percent, medium fiber section pulp inlet pressure: 220-250kpa, feeding pulp at the middle fiber section, and reducing the good pulp pressure: 130-150kpa, medium fiber first-stage slag discharge pressure: 60-90kpa, slag concentration of the medium fiber section: 2.6 percent; the slag removal rate of the first section of the medium fiber is 24 percent;
removing slag from the medium fiber in the second stage: adding the residue obtained after primary deslagging of the medium fiber into diluted white water, and deslagging by using a medium fiber secondary deslagging device provided with a medium fiber secondary pulp saver; wherein the pulp inlet concentration of the medium-fiber two-stage slag separator is as follows: 1.11%, slurry inlet pressure: 220-250kpa, pulp inlet and fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.24 percent; the elutriation white water is connected into the medium fiber two-stage pulp saver, the pressure of the dilution water of the medium fiber two-stage pulp saver is 140-200kpa, and the flow of the dilution water of the medium fiber two-stage pulp saver is 50-60L/min; the slag removal rate of the secondary medium fiber section is 29 percent;
medium fiber three-stage deslagging: adding the residue obtained after medium fiber two-stage deslagging into diluted white water, and deslagging by using a medium fiber three-stage deslagging device provided with a medium fiber three-stage pulp saver; wherein the pulp inlet concentration of the medium fiber three-section slag separator is as follows: 0.65%, slurry inlet pressure: 220-250kpa, pulp inlet and fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.3 percent; elutriation white water is added into the three-section pulp saver, the pressure of the dilution water of the medium fiber three-section pulp saver is 140-200kpa, and the flow of the dilution water of the medium fiber three-section pulp saver is 50-60L/min; the medium fiber three-stage deslagging rate is 35 percent.
3. Deslagging long fibers, namely deslagging by adopting a five-section mode, deslagging by adopting a deslagging device for deslagging the first section of long fibers, deslagging by adopting a second section of long fibers, deslagging by adopting a third section of long fibers, deslagging by adopting a fourth section of long fibers, deslagging by adopting a deslagging device and a slurry saving device for deslagging by adopting the fifth section of long fibers; obtaining tailings; comprises that
Removing slag at a long fiber section: adding the long fibers into the diluted white water, and then removing the slag by using a long fiber first-stage slag remover, wherein the pulp inlet concentration of the long fiber first-stage slag remover is as follows: 1.39%, long fiber section pulp inlet pressure: 330-350kpa, feeding the long fiber into the pulp at one section, and reducing the pressure of the good pulp: 130-150kpa, first-stage slag discharge pressure of long fibers: 110-120kpa, slag concentration of long fiber at one section: 3.6 percent; the first-stage deslagging rate of the long fibers is 26%;
removing slag in the long fiber second stage: adding the residue obtained after the long fiber primary section deslagging into diluted white water, and deslagging by using a long fiber secondary section deslagging device provided with a long fiber secondary section pulp saver; wherein the pulp inlet concentration of the long fiber two-stage slag remover is as follows: 1.1%, slurry inlet pressure: 220-250kpa, pulp inlet and fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.3 percent; the elutriation white water is connected into the long fiber two-stage pulp saver, the dilution water pressure of the long fiber two-stage pulp saver is 140-200kpa, and the dilution water flow of the long fiber two-stage pulp saver is 50-60L/min; the long fiber two-stage deslagging rate is 30 percent;
removing slag in three sections of long fibers: adding the residue obtained after the long fiber two-stage deslagging into diluted white water, and deslagging by using a long fiber three-stage deslagging device provided with a long fiber three-stage pulp saver; wherein the pulp inlet concentration of the long fiber three-section slag remover is as follows: 0.79%, feed pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.86 percent, the diluting water pressure of the long fiber three-section pulp saver is 140-200kpa, and the diluting water flow of the long fiber three-section pulp saver is 50-60L/min; the long fiber three-stage deslagging rate is 36 percent;
removing slag in four sections of long fibers: adding the residue obtained after long fiber three-stage deslagging into diluted white water, and deslagging by using a long fiber four-stage deslagging device provided with a long fiber four-stage pulp saver; wherein, the pulp inlet concentration of the long-fiber four-section slag remover is as follows: 0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.86 percent, the diluting water pressure of the long-fiber four-section pulp saver is 140-200kpa, and the diluting water flow of the long-fiber four-section pulp saver is 50-60L/min; the slag removal rate of the long fiber in the four sections is 44 percent;
removing slag in five sections of long fibers: adding the residue obtained after deslagging the four sections of the long fibers into diluted white water, and deslagging the residue by using a long fiber five-section deslagging device provided with a long fiber five-section pulp saver; wherein the pulp inlet concentration of the long-fiber five-section slag separator is as follows: 0.63%, slurry inlet pressure: 220-250kpa, pulp inlet and fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.81 percent; the washing white water is connected into the five-section pulp saver, the pressure of the dilution water of the long-fiber five-section pulp saver is 140-200kpa, and the flow of the dilution water of the long-fiber five-section pulp saver is 50-60L/min. The slag removal rate of the five long fiber sections is 53 percent, and the ash content of the tailings obtained after slag removal of the five long fiber sections is 68 to 70 percent.
And (3) putting tailings obtained after five sections of long fibers are subjected to slag removal into a sand settling channel, performing solid-liquid separation, recovering white water at the upper part, and incinerating solid waste at the lower part. The mass of the solid waste is 0.008% -0.01% of that of the OCC slurry, and the ash content of the solid waste is 90-95%. The deslagging rate of the kraft paper OCC slurry low-concentration heavy-weight deslagging method is 0.02-0.035%. By adopting the novel process, the craft paper can save OCC waste paper raw materials by about 25-30kg/t paper, reduce emission of low-concentration tailing solid waste by about 25-30kg/t paper, the yield of the craft paper of a company is about 150 ten thousand tons/year, the waste paper raw materials can be saved by about 3.75-4.5 ten thousand tons/year, the emission of low-concentration heavy tailing solid waste is reduced by about 3.75-4.5 ten thousand tons/year, and the environment-friendly benefit and the economic benefit are good.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "include", "including" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or terminal device including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article, or terminal device. Without further limitation, an element defined by the phrases "comprising 8230; \8230;" or "comprising 8230; \8230;" does not exclude the presence of additional elements in a process, method, article, or terminal device that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (1)
1. The low-concentration heavy-weight deslagging method for the kraft cardboard OCC slurry is characterized by comprising the following steps: the OCC slurry is crushed, sieved and classified into short fiber, medium fiber and long fiber, and white water is added separately for eliminating slag
Short fiber deslagging: three-stage deslagging is adopted, a deslagging device is adopted for short fiber first-stage deslagging, and deslagging is carried out by adopting a deslagging device and a slurry saving device for short fiber second-stage deslagging and short fiber third-stage deslagging;
removing slag from the medium fiber: three-stage deslagging is adopted, a deslagging device is adopted for medium fiber first-stage deslagging, and a deslagging device and a slurry saving device are adopted for medium fiber second-stage deslagging and medium fiber third-stage deslagging;
deslagging long fibers, namely deslagging by adopting a five-section mode, deslagging by adopting a deslagging device for deslagging the first section of long fibers, deslagging by adopting a second section of long fibers, deslagging by adopting a third section of long fibers, deslagging by adopting a fourth section of long fibers, deslagging by adopting a deslagging device and a slurry saving device for deslagging by adopting the fifth section of long fibers; obtaining tailings;
the pulp saver is arranged on the slag remover and is accessed with elutriation white water;
the short fiber deslagging comprises the following steps:
short fiber first-stage deslagging: adding the staple fibers into the diluted white water, and then removing the slag by using a staple fiber first-stage slag remover, wherein the pulp inlet concentration of the staple fiber first-stage slag remover is as follows: 1.0-1.3%, short fiber first-stage pulp inlet pressure: 220-250kpa, feeding short fiber into the pulp at one section, and reducing the pressure of good pulp: 130-150kpa, short fiber first-stage deslagging pressure: 80-110kpa, first-stage slag concentration of short fiber: 2.5 to 3.0 percent;
short fiber two-stage deslagging: adding the residue obtained after primary short fiber residue removal into diluted white water, and removing residues by using a short fiber secondary residue remover provided with a short fiber secondary pulp saver; wherein the pulp inlet concentration of the short fiber two-stage slag remover is as follows: 1.0-1.3%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.0 to 3.2 percent; adding elutriation white water into the short fiber two-stage festival pulp machine, the dilute water pressure of the short fiber two-stage festival pulp machine is 140-200kpa, the dilute water flow of the short fiber two-stage festival pulp machine is 50-60L/min;
short fiber three-stage deslagging: adding the residue obtained after the short fiber two-stage deslagging into diluted white water, and deslagging by using a short fiber three-stage deslagging device provided with a short fiber three-stage pulp saver; wherein the pulp inlet concentration of the short fiber three-section slag remover is as follows: 0.7-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet and fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.4-3.0%; elutriation white water is added into the three-section pulp saver, the pressure of the dilution water of the short fiber three-section pulp saver is 140-200kpa, and the flow rate of the dilution water of the short fiber three-section pulp saver is 50-60L/min;
the primary short fiber deslagging rate is 22-25%; the short fiber two-stage deslagging rate is 25-30%; the short fiber three-stage deslagging rate is 30-35%;
the medium fiber deslagging comprises the following steps:
removing slag from the medium fiber section: adding the medium fiber into the diluted white water, and then removing the slag by using a medium fiber first-stage slag remover, wherein the medium fiber first-stage slag remover enters the pulp concentration: 1.0-1.3%, and the pulp inlet pressure of the middle fiber section: 220-250kpa, feeding pulp into the middle fiber section, and reducing the pressure of good pulp: 130-150kpa, medium fiber first-stage slag discharge pressure: 60-90kpa, slag concentration at the middle fiber section: 2.5 to 3.0 percent;
removing slag from the medium fiber in the second stage: adding the residue obtained after primary deslagging of the medium fiber into diluted white water, and deslagging by using a medium fiber secondary deslagging device provided with a medium fiber secondary pulp saver; wherein the pulp inlet concentration of the medium-fiber two-stage slag separator is as follows: 1.1-1.3%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.0 to 3.5 percent; adding elutriation white water into the medium-fiber second-stage pulp saver, wherein the pressure of the dilution water of the medium-fiber second-stage pulp saver is 140-200kpa, and the flow of the dilution water of the medium-fiber second-stage pulp saver is 50-60L/min;
medium fiber three-stage deslagging: adding the residue obtained after medium fiber two-stage deslagging into diluted white water, and deslagging by using a medium fiber three-stage deslagging device provided with a medium fiber three-stage pulp saver; wherein the pulp inlet concentration of the medium fiber three-section slag separator is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.3 to 3.0 percent; elutriation white water is added into the three-section pulp saver, the pressure of the dilution water of the medium fiber three-section pulp saver is 140-200kpa, and the flow of the dilution water of the medium fiber three-section pulp saver is 50-60L/min;
the primary-stage deslagging rate of the medium fiber is 22-26%; the slag removal rate of the secondary medium fiber section is 28-32%; the medium fiber three-stage deslagging rate is 30-38%;
the long fiber deslagging comprises the following steps:
removing slag at a long fiber section: adding the long fibers into the diluted white water, and then removing the residues by using a long fiber first-stage residue remover, wherein the pulp inlet concentration of the long fiber first-stage residue remover is as follows: 1.1-1.4%, the pulp inlet pressure of the long fiber section: 330-350kpa, feeding the long fiber into the pulp at one section, and reducing the pressure of the good pulp: 130-150kpa, first-stage slag discharge pressure of long fibers: 110-120kpa, slag concentration of long fiber at one section: 3.2 to 3.6 percent;
removing slag in the long fiber second stage: adding the residue obtained after long fiber primary deslagging into diluted white water, and deslagging by using a long fiber secondary deslagging device provided with a long fiber secondary pulp saver; wherein the pulp inlet concentration of the long fiber two-stage slag remover is as follows: 1.1-1.3%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 3.0 to 3.5 percent; the elutriation white water is connected into the long fiber two-stage pulp saver, the dilution water pressure of the long fiber two-stage pulp saver is 140-200kpa, and the dilution water flow of the long fiber two-stage pulp saver is 50-60L/min;
removing slag in three sections of long fibers: adding the residue obtained after the long fiber two-stage deslagging into diluted white water, and deslagging by using a long fiber three-stage deslagging device provided with a long fiber three-stage pulp saver; wherein the pulp inlet concentration of the long fiber three-section slag remover is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-150kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.5-3.0%, the diluting water pressure of the long fiber three-section pulp saver is 140-200kpa, and the diluting water flow of the long fiber three-section pulp saver is 50-60L/min;
removing slag in the four sections of long fiber: adding the residue obtained after long fiber three-stage deslagging into diluted white water, and deslagging by using a long fiber four-stage deslagging device provided with a long fiber four-stage pulp saver; wherein, the pulp inlet concentration of the long-fiber four-section slag remover is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.8-4.0%, the diluting water pressure of the long fiber four-section pulp saver is 140-200kpa, and the diluting water flow of the long fiber four-section pulp saver is 50-60L/min;
removing slag in five sections of long fibers: adding the residue obtained after removing the residue in the four sections of the long fiber into the diluted white water, and removing the residue by using a long fiber five-section residue remover provided with a long fiber five-section slurry saver; wherein the pulp inlet concentration of the long-fiber five-section slag separator is as follows: 0.6-0.8%, slurry inlet pressure: 220-250kpa, pulp inlet, fine pulp pressure drop: 130-145kpa, slag discharge pressure: 60-90kpa, slag concentration: 2.5 to 3.0 percent; the washing white water is connected into the five-section pulp saver, the pressure of the dilution water of the long-fiber five-section pulp saver is 140-200kpa, and the flow of the dilution water of the long-fiber five-section pulp saver is 50-60L/min;
the slag removal rate of the long fiber at the first section is 25-28%; the long fiber two-stage deslagging rate is 28-32%; the long fiber three-stage deslagging rate is 32-36%; the long fiber four-stage deslagging rate is 40-45%; the slag removal rate of the five long fiber sections is 50-55%, and the ash content of the tailings obtained after slag removal of the five long fiber sections is 68-70%;
further comprising the steps of:
putting tailings obtained after five sections of long fibers are subjected to slag removal into a sand settling channel, performing solid-liquid separation, recovering white water at the upper part, and incinerating solid waste at the lower part;
the mass of the solid waste is 0.008% -0.01% of that of the OCC slurry, and the ash content of the solid waste is 90-95%;
the deslagging rate of the kraft paper OCC slurry low-concentration heavy-weight deslagging method is 0.02-0.035%.
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| EP0829571A1 (en) * | 1996-09-12 | 1998-03-18 | Hans-Joachim Boltersdorf | Process for recovery of fibres from rejects from pulping disposal systems |
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