CN100402743C - Method for extruding black liquor from high-hardness plasm obtained by boiling grass plant raw material - Google Patents

Method for extruding black liquor from high-hardness plasm obtained by boiling grass plant raw material Download PDF

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CN100402743C
CN100402743C CNB2007101431334A CN200710143133A CN100402743C CN 100402743 C CN100402743 C CN 100402743C CN B2007101431334 A CNB2007101431334 A CN B2007101431334A CN 200710143133 A CN200710143133 A CN 200710143133A CN 100402743 C CN100402743 C CN 100402743C
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pulp
hardness
black liquor
hardness pulp
boiling
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CN101082189A (en
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陈松涛
宋明信
宋建军
李洪法
杨吉慧
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Shandong Fuyin Paper and Environmental Protection Technology Co Ltd
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Shandong Tralin Paper Co Ltd
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Abstract

The invention provides a method to remove black liquor by a presser from the high rigidity pulp prepared by cooling the grass materials. Send the cooked pulp which has the rigidity of potassium permanganate value 16-28 (equals to karber value 24-50) into the inlet of the presser for pressing. The pulp discharges from the outlet after removing the black liquor. The invention aims at pressing the low concentration and high rigidity pulp prepared by cooling the grass materials to remove the black liquor. It prepares for the necessary washing and bleaching steps during the processing, advances the bleaching effect and saves the necessary chemicals for bleaching, which is an economic and environmental protection method.

Description

A kind of method of utilizing press master that the grass high-hardness pulp is handled
Technical field
The present invention relates to a kind of preparation technology of bleach chemical pulp, more particularly, relate to a kind of method of utilizing press master that the grass high-hardness pulp is handled.
Background technology
The method of producing paper pulp with string has: chemical method, Mechanical Method, chemical mechanical pulping.Chemical pulping is by chemical action, makes raw material disassociation pulping by some composition of removing in the plant fiber material, is a kind of most widely used pulping process.
Chemical pulping of the prior art is to be raw material with the string.Its technical process is at first to get the raw materials ready, the raw material that will carry out pretreated production paper pulp is packed in rotary spherical digester or the upright pot equipment such as (digester, vertical digester, continuous steamers), adding chemicalss such as NaOH or sulphite again and carry out the gas phase boiling, is exactly directly logical Steam Heating, insulation and produce qualified paper pulp.
Because directly logical Steam Heating, chemical reaction fierceness, i.e. the chemical reaction fierceness of delignification.Not only there is papermaking to starch desired fiber in the raw material, also contains other components of producing the unwanted hemicellulose of paper pulp, lignin and resin, pectin, starch, tannin, pigment, inorganic compound.When boiling, at first under lower temperature, carry out, at this moment just there is lignin to separate with pars fibrosa, when treating that elevated temperature carries out boiling, condensation such as lignin in the low-temp reaction product, poly-pentose etc. again are attached on the surface of fiber, be difficult to again eccysis from the fiber, so lack of homogeneity, the screenings of paper pulp are many, hardness height, the drainability of slurry are poor, need a large amount of water washings to remove the black liquor of heteroproteose cell, hemicellulose, lignin composition, cause the sewage pollution environment, the cost up of more feasible production paper pulp, also giving down, the bleaching in step causes difficulty.1 ton of paper pulp of the every production of this technology of prior art produces the 10-12 ton, even 18 tons of black liquor, and this black liquor viscosity height (generally when concentration 42% 100 be about 460 centipoises when spending).The processing of black liquor is the common technique difficult problem in paper mill, black liquor is directly discharged the severe contamination that causes environment.
Grass class pulping technique is a system engineering, to study the overall process of slurrying according to the inhomogeneity of the biological structure of grass fiber raw material and the particularity of chemical composition, fibers in grass class slurrying has following characteristics: 1. heavily get the raw materials ready, silica removal, remove heteroproteose cell, improve pulp quality, drainability reduces the recovery of black liquor; 2. the characteristic of grass fiber delignification.Owing to have more alkali that easy molten lignin is arranged in the grass fiber, its slurrying difficulty is reduced, but it requires higher delignification rate that fiber is dissociated again simultaneously, so its pulping process should be very different with timber.3. owing to silicone content height in the raw material, the carbohydrate content height causes its black liquor viscosity height, and recovery difficult is big.4. grass contains a large amount of heteroproteose cells in now being, papermaking is formed a series of harm.5. the bleachability of straw pulp is good than timber, easily adopts short flow process, and chlorine-free bleaching reaches high whiteness.
Grass kind plant fiberoptic fiber raw material belongs to non-wood fibrous raw material, comprises straw, wheat straw, reed, bagasse, sorghum stalk, cornstalk, cotton stalk etc.The forest reserves of China lack, and the main raw material that is used for papermaking is a grass as raw material.Generally speaking, as paper making raw material, wood raw material is better than grass as raw material, and needlebush is better than leaf wood again in the wood raw material.Under the serious situation that China's Forest Resources lacks day by day, how utilizing grass as raw material to prepare high-quality paper pulp is present urgent problem.
There are many technical staff to be devoted to the research of this respect, such as:
Introduced double helix extrusion Alkaline Peroxide Mechanical Pulp new pulping process in the Chinese patent CN200410071936 application.It is main pulping raw material with timber that this method provides a kind of; through washing, decatize, hot water or alkaline Pretreatment, two sections double helix squeezing extrusions, two sections pulping process that operations such as high dense mill are formed; the purpose of this patent is the expense of reducing investment outlay, energy-conservation and environmental protection three aspects, and it is suitable to use this pulping process to prepare the quality of the quality of slurry of gained and traditional APMP slurry.This patent provides the method that Mechanical Method prepares paper pulp, and prepared paper pulp is used to produce various paper, product of low quality.
Grass as raw material is because fiber is tiny, heteroproteose cell is many, ash content and pentose content height, the temperature of grass as raw material pulping and digesting of the prior art is than higher, and the time of boiling and insulation is longer, and when consuming a large amount of energy, the hardness of the slurry of boiling gained is low, therefore the black liquor viscosity of gained is also big, is unfavorable for separating of black liquor and slurry.
In sum, researcher of the present invention Given this, special proposition the present invention, method of the grass kind plant raw material being carried out the high-hardness pulp extruding black liquor of gained after the boiling of the present invention, can not only improve the quality of straw pulp, and can reduce the treating capacity of waste liquid, reduce the grade content of impurity of lignin, ash in the paper pulp, for sufficient preparation has been carried out in the washing and the bleaching in one step of back.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing press master that the grass high-hardness pulp is handled.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of method of utilizing press master that the grass high-hardness pulp is handled, the high-hardness pulp hardness of gained is equivalent to card uncle valency 24-50 for permanganate number 16-28 after the described grass kind plant boiling; Described high-hardness pulp preferred hardness is equivalent to card uncle valency 29-48 for permanganate number 18-27; Described high-hardness pulp most preferably hardness is equivalent to card uncle valency 34-42 for permanganate number 20-25.
Method described in the present invention is: being the 8-15% high-hardness pulp with gained concentration after the grass kind plant boiling enters from the inlet of press master, carries out shove, and after the extruding black liquor, concentration is that the slurry of 20-30% is discharged from the outlet of press master.
The beating degree of described high-hardness pulp before carrying out shove is 22-28 ° of SR.
The beating degree of described high-hardness pulp after carrying out shove is 23-29 ° of SR.
High-hardness pulp of the present invention is a grass kind plant raw material process Ammonium Sulfite Method boiling gained, and the actual conditions of Ammonium Sulfite Method boiling is: the ammonium sulfite consumption is that liquor ratio is 1: 2-4 to over dry material quantity 9-13%; Heat temperature raising is to temperature is 100-120 ℃ time insulation 20-40 minute, carry out little steam bleeding after, continue heat temperature raising to 165-173 ℃, be incubated 60-90 minute.
High-hardness pulp of the present invention also can be grass kind plant raw material process anthraquinone-soda cooking gained, the actual conditions of anthraquinone-soda cooking is: the consumption of NaOH is over dry material quantity 9-12%, liquor ratio is 1: 2-4, and the anthraquinone addition is the 0.5-0.8% of over dry material quantity; Heat temperature raising is incubated 20-40 minute when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
The Baume degrees of the black liquor that shove is extruded among the present invention is 7-9 ° of Be ' at 20 ℃.
The Baume degrees of the black liquor that shove is extruded among the present invention is 20 ℃ and is 9-11 ° of Be '.
Described press master is to extract the acroll press washer that black liquor is used in the prior art; Preferred described press master is the acroll press washer of reducing varying pitch
Grass kind plant of the present invention is a kind of in wheat straw, straw, bagasse, cotton stalk, the reed or more than one mixing.
Specifically, with grass kind plant carry out boiling intact after, the high-hardness pulp that has obtained permanganate number and be 16-28 is equivalent to card primary valency 24-50.Boiling can be alkaline process cooking method of the prior art and sulfite cooking method among the present invention.Wherein said ammonium sulfite comprises the steps:
(1) adding is to the ammonium sulfite solution of over dry material quantity 9-13% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
Described anthraquinone-soda processes comprises the steps:
(1) adding is to the sodium hydroxide solution of over dry material quantity 9-12% in the grass kind plant raw material, and wherein liquor ratio is 1: 2-4, and the anthraquinone addition is the 0.5-0.8% of over dry material quantity;
(2) feed steam and heat, heat temperature raising is incubated 20-40 minute when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
The purpose of boiling is to utilize the effect of cooking liquor, suitably removes the lignin in the raw material, keeps cellulose as far as possible and the part hemicellulose is beneficial to copy paper.In digestion process, because the use of thermophilic digestion and chemical steaming soup, certain chemical change all can take place in the lignin in the raw material, cellulose and hemicellulose and other composition, is subjected in various degree degraded and damage.High-hardness pulp of the present invention, because the concentration of used soup reduces during boiling, and the time of boiling and insulation also shorten greatly, thereby on to greatest extent, reduced the loss of needed cellulose and hemicellulose in the paper pulp, the yield of paper pulp is improved.
After boiling finishes, spurt to spraying pot after the pressure dilution that the high-hardness pulp maintenance of gained is certain, described pressure is 0.75MPa.The concentration of the high-hardness pulp in the spraying pot is 8-15% at this moment, hardness is equivalent to card uncle valency 24-50 for permanganate number 16-28, beating degree is 22-28 ° of SR, be connected by delivery pump between spraying pot and the acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, the concentration of the slurry of sending is brought up to 18-30% by 8-15%, become the high-hardness pulp of high concentration, temperature is 70-80 ℃.In shove, most of black liquor is extruded the back and stores in the black liquor groove.High-hardness pulp for the grass kind plant raw material being carried out Ammonium Sulfite Method boiling gained carries out after the shove, and the black liquor of being extruded Baume degrees in the time of 20 ℃ is 7-9 ° of Be ', and the concentration of the ammonium sulfite of the remnants in the black liquor is 8-10g/L.For the grass kind plant raw material being carried out the prepared high-hardness pulp of anthraquinone-soda cooking, carry out after the shove, the black liquor of being extruded Baume degrees in the time of 20 ℃ is 9-11 ° of Be ', the content of residual alkali is 12-14g/L in the black liquor.The slurry that comes out from the outlet of press master dilutes with the black liquor that pulp washing the subsequent technique displaces, and described black liquor is 3-6 ° of Be ' at 20 ℃ of Baume degrees, perhaps can directly soak the row dilution with clear water, makes underflow deliver to jump to 2.5-3% and screens.
Bleach chemical pulp described in the present invention is meant that whiteness is 68-82%ISO, and the delignification rate is the chemical pulp of 84-98%.Shove technology among the present invention is being raw material with the high-hardness pulp, uses in the process of preparation bleach chemical pulp.Described high-hardness pulp hardness is equivalent to card uncle valency 24-50 for permanganate number 16-28, and preferred described hardness is equivalent to card uncle valency 29-48 for permanganate number 18-27, and most preferably hardness is equivalent to card uncle valency 34-42 for permanganate number 20-25.
Press master described in the present invention is the acroll press washer that is used for extracting black liquor in the prior art.When using press master to carry out shove, because the process at shove can produce very big extruding force, temperature rises rapidly, impel fiber separation, divide silk, brooming, conquassation, primary wall is destroyed, the enough energy of fiber absorbs make fibrous inside produce very big stress, and the reactivity worth of high-hardness pulp is greatly improved.Simultaneously, fiber produces fibrillating, and impurity is dissolved in the black digestion liquid between epidermis organic matter and fiber, discharges by liquid outlet groove, and fiber fineness is greatly improved.Some ash contents in the black liquor and impurity are also along with black liquor is discharged from, for sufficient preparation has been carried out in next step pulp washing and bleaching.Press master of the present invention is that the acroll press washer that the extraction black liquor is used in the prior art is single-screw press master and Double screw pulp extruder; Preferred described press master is the acroll press washer of reducing varying pitch.
Preferred press master is the acroll press washer of reducing varying pitch among the present invention, utilizes reducing varying pitch press master, makes slurry in the space that slowly diminishes, and makes the about dehydration of compressed slurry layer consistent.The acroll press washer that the present invention is selected, after high-hardness pulp is carried out shove, the beating degree of described high-hardness pulp changes little, that is to say, described high-hardness pulp is through after the press master shove, can the fibre length that fibers in grass class is intrinsic keep relatively goodly, reduce the damage of fiber to greatest extent.
Beneficial effect of the present invention is: in the method for the present invention the slurry of the high rigidity of gained after the boiling is delivered to by pump and carries out shove in the press master, through after this process, high-hardness pulp has become the dogstail plasmoid of high concentration, most of black liquor in the high-hardness pulp is extruded, in this black liquor, contain the lignin, the ash that are contained in the grass kind plant raw material impurity that grades, the discharge of these impurity for after washing, bleaching in the process of preparation bleach chemical pulp advantageous conditions is provided.Owing to high-hardness pulp is being carried out in the process of shove, the extrusion process of press master, the high concentration and high efficiency in early stage of having realized black liquor extracts, the black liquor that is extracted recycles, and the content of organics and other impurity that enter in next step production system are significantly reduced, for operations such as the washing after the preparation bleach chemical pulp shove, bleaching are got ready, make that the water consumption of washing is few, chemicals consumption in the bleaching process reduces, and has therefore reduced pollution, has reduced production cost.The more important thing is, because the use of press master, the beating degree of described high-hardness pulp before and after shove changes little, therefore this just illustrates that high-hardness pulp damage to fibers in grass class in the shove process is very little, and the use of press master can not reduce the performance of prepared bleach chemical pulp in the process that with the grass kind plant is the feedstock production bleach chemical pulp.And in the process of shove, because lignin and other impurity such as ash content equal size are higher in the high-hardness pulp, and the pass through lignin of fiber between fiber adheres to, the process of boiling is because condition is relatively gentleer, the time of boiling and insulation is all shorter, used chemicals is few, thereby the hardness height that gained is starched after the boiling, content of lignin in the described high-hardness pulp is higher, the fibre bundle that in the process of shove some is sticked together unclamps, for sufficient preparation has been carried out in the washing and the bleaching in one step of back.Be raw material with described high-hardness pulp among the present invention, carry out the shove process, the preparation bleach chemical pulp, the whiteness of described bleach chemical pulp is 68-82%ISO, the delignification rate is 84-98%.With described high-hardness pulp is the prepared bleach chemical pulp of raw material, its beating degree is 25-36 ° of SR, fracture length is 4500-8000m, folding number is 20-70, whiteness is 68-82%ISO, the quality of prepared with the grass kind plant the is bleach chemical pulp of feedstock production is comparable to existing leaf wood paper pulp, even has also surpassed existing leaf wood pulp quality.
The specific embodiment
Embodiment 1
With the straw is that raw material carries out the ammonium sulfite boiling, obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 16 is equivalent to card uncle valency 24, the concentration of the high-hardness pulp in the spraying pot is 10% at this moment, beating degree is 28 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of press master, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 30%, temperature is 75 ℃, beating degree is 29 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the temperature of the black liquor of being extruded is 85 ℃, Baume degrees is 7 ° of Be ' at 20 ℃, residual ammonium 8g/L.The underflow of coming out from the outlet of press master is diluted to 2.5% and delivers to jump and screen.To jump the slurry that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the single-screw press master of the reducing varying pitch that the extraction black liquor is used in the prior art.
Embodiment 2
With the wheat straw is that raw material carries out the ammonium sulfite boiling, obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 18 is equivalent to card uncle valency 29, the concentration of the high-hardness pulp in the spraying pot is 12% at this moment, beating degree is 26 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 25%, temperature is 80 ℃, beating degree is 27 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the temperature of the black liquor of being extruded is 80 ℃, recording Baume degrees at 20 ℃ is 8 ° of Be ', residual ammonium 10g/L.The underflow of coming out from the outlet of press master is diluted to 3% and delivers to jump and screen.To jump the Straw Pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the Double screw pulp extruder of the reducing varying pitch that the extraction black liquor is used in the prior art.
Embodiment 3
With bagasse is that raw material carries out the ammonium sulfite boiling, obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 20 is equivalent to card uncle valency 34, the concentration of the high-hardness pulp in the spraying pot is 10% at this moment, beating degree is 25 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 22%, temperature is 73 ℃, beating degree is 26 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the temperature of the black liquor of being extruded is 76 ℃, recording Baume degrees in the time of 20 ℃ is 9 ° of Be ', residual ammonium 9g/L.The underflow of coming out from the outlet of press master is diluted to 2.8% and delivers to jump and screen.To jump the bagasse pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the Double screw pulp extruder of the reducing varying pitch that the extraction black liquor is used in the prior art.
Embodiment 4
With cotton stalk is that raw material carries out the ammonium sulfite boiling, adds the ammonium sulfite solution to over dry material quantity 13% in the grass kind plant raw material, and liquor ratio is 1: 4; Feed steam and heat, little steam bleeding is carried out in heat temperature raising insulation 20-40 minute when temperature is 110 ℃, continues heat temperature raising to 173 ℃, is incubated 80 minutes.Obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 22 is equivalent to card uncle valency 35, the concentration of the high-hardness pulp in the spraying pot is 8% at this moment, beating degree is 24 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 20%, temperature is 75 ℃, and beating degree is 25 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the black liquor temperature of being extruded is 80 ℃, measuring Baume degrees at 20 ℃ is 7.5Be ', residual ammonium 7g/L.The underflow of coming out from the outlet of press master is diluted to 3% and delivers to jump and screen.To jump the cotton dry pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the single-screw press master of the reducing varying pitch that the extraction black liquor is used in the prior art.
Embodiment 5
With wheat straw and straw is that raw material carries out the ammonium sulfite boiling, and the mass ratio of wheat straw and straw is 1: 1, and condition is: add the ammonium sulfite solution to over dry material quantity 9% in wheat straw and straw raw material, wherein liquor ratio is 1: 3; Feed steam and heat, heat temperature raising is incubated 30 minutes when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 70 minutes.Obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 26 is equivalent to card uncle valency 43, the concentration of the high-hardness pulp in the spraying pot is 10% at this moment, beating degree is 23 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of Double screw pulp extruder, high-hardness pulp enters from the inlet of Double screw pulp extruder, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 22%, temperature is 78 ℃, and beating degree is 24 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the black liquor temperature of being extruded is 80 ℃, and recording Baume degrees at 20 ℃ is 8.5 ° of Be ', and residual ammonium is 7g/L.The underflow of coming out from the outlet of press master is diluted to 2.5-3% and delivers to jump and screen.To jump the wheat straw straw mixed pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the single-screw press master of the reducing that the extraction black liquor is used in the prior art.
Embodiment 6
With the reed is that raw material carries out anthraquinone-soda cooking, obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 28 is equivalent to card uncle valency 49, the concentration of the high-hardness pulp in the spraying pot is 15% at this moment, beating degree is 22 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of press master, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 30%, temperature is 70-80 ℃, beating degree is 23 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the black liquor temperature of being extruded is 76 ℃, and recording Baume degrees in the time of 20 ℃ is 10 ° of Be ', and the content of residual alkali is 14g/L.The underflow of coming out from the outlet of press master is diluted to 2.5-3% and delivers to jump and screen.To jump the reed pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the Double screw pulp extruder of the reducing that the extraction black liquor is used in the prior art.
Embodiment 7
With the wheat straw is that raw material carries out anthraquinone-soda cooking, and conditions of cooking is: add the sodium hydroxide solution to over dry material quantity 11% in the grass kind plant raw material, wherein liquor ratio is 1: 3, and the anthraquinone addition is 0.6% of an over dry material quantity; Feed steam and heat, little steam bleeding is carried out in heat temperature raising insulation 40 minutes when temperature is 110 ℃, continues heat temperature raising to 170 ℃, is incubated 90 minutes.Obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution that permanganate number 17 is equivalent to card uncle valency 26, the concentration of the high-hardness pulp in the spraying pot is 8% at this moment, beating degree is 27 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of press master, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 20%, temperature is 75 ℃, and beating degree is 28 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the temperature of the black liquor of being extruded is 75 ℃, and recording Baume degrees at 20 ℃ is 9 ° of Be ', and the content of residual alkali is 12g/L.The underflow of coming out from the outlet of press master is diluted to 2.5-3% and delivers to jump and screen.To jump the Straw Pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the single-screw press master of the reducing that the extraction black liquor is used in the prior art.
Embodiment 8
With straw and wheat straw is that raw material carries out anthraquinone-soda cooking, wherein the mass ratio of straw and wheat straw is 1: 3, the hardness that obtains after the boiling gained is that permanganate number 19 is when spurting to spraying pot after the high-hardness pulp dilution of card uncle valency 31, the concentration of the high-hardness pulp in the spraying pot is 12% at this moment, beating degree is 25 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 28%, temperature is 78 ℃, and beating degree is 26 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the black liquor temperature of being extruded is 80 ℃, and recording Baume degrees at 20 ℃ is 9.5Be ', and the content of residual alkali is 13g/L.The underflow of coming out from the outlet of press master is diluted to 2.5-3% and delivers to jump and screen.To jump the rice straw pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the single-screw press master of the reducing that the extraction black liquor is used in the prior art.
Embodiment 9
With reed and wheat straw is that raw material carries out anthraquinone-soda cooking, reed and wheat straw raw material mass ratio are 1: 4, conditions of cooking is the sodium hydroxide solution that adds in the grass kind plant raw material over dry material quantity 10%, wherein liquor ratio is 1: 2-4, and the anthraquinone addition is the 0.5-0.8% of over dry material quantity; Feed steam and heat, heat temperature raising is incubated 40 minutes when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 80 minutes.Obtain hardness with gained after the boiling and be spurting to spraying pot after the high-hardness pulp dilution back dilution that permanganate number 21 is equivalent to card uncle valency 36, the concentration of the high-hardness pulp in the spraying pot is 14% at this moment, beating degree is 24 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 28%, temperature is 73 ℃, and beating degree is 25 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the temperature of the black liquor of being extruded is 73 ℃, and recording Baume degrees at 20 ℃ is 10 ° of Be ', and the content of residual alkali is 14g/L.The underflow of coming out from the outlet of press master is diluted to 2.5-3% and delivers to jump and screen.To jump the rice straw pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the Double screw pulp extruder of the reducing that the extraction black liquor is used in the prior art.
Embodiment 10
With reed, straw and wheat straw are that raw material carries out anthraquinone-soda cooking, three's mass ratio is 1: 1: 1, the hardness that obtains after the boiling gained is that permanganate number 23 is when spurting to spraying pot after the dilution after the high-hardness pulp dilution of card uncle valency 40, the concentration of the high-hardness pulp in the spraying pot is 13% at this moment, beating degree is 23 ° of SR, spraying pot is connected by delivery pump with acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, this moment slurry concentration 26%, temperature is 72 ℃, and beating degree is 24 ° of SR.In shove, the black liquor in the described high-hardness pulp after the boiling is extruded in the black liquor groove stores, the black liquor temperature of being extruded is 72 ℃, and recording Baume degrees at 20 ℃ is 11 ° of Be, and the content of residual alkali is 13.5g/L.The underflow of coming out from the outlet of press master is diluted to 2.5-3% and delivers to jump and screen.To jump the rice straw pulp that obtains behind the sieve again and adopt three sections vacuum pulp washing machines to wash, and the slurry that will discharge from vacuum pulp washing machine is removed impurity by the high concentration scummer again.Described press master is the Double screw pulp extruder of the reducing that the extraction black liquor is used in the prior art.
It is raw material utilization shove prepared bleach chemical pulp that following examples relate to the high-hardness pulp.
Embodiment 11
The product of last gained among the embodiment 1 is bleached, at first carrying out oxygen floats, its oxygen addition is the 2-5% of oven dry stock amount, the addition of NaOH is for being the 2-4% of oven dry stock amount, add magnesium sulfate salt and make protective agent, the temperature that oxygen floats is 90-110 ℃, oxygen floats after the end, bleach in more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5, the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 72%ISO, and fracture length is 6000m, is a kind of high-quality paper pulp.
Embodiment 12
The product of last gained among the embodiment 2 is bleached, at first carrying out oxygen floats, its oxygen addition is the 2-5% of oven dry stock amount, the addition of NaOH is for being the 2-6% of oven dry stock amount, add magnesium sulfate salt and make protective agent, the temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, bleach in more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5%, the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 75%ISO, and fracture length is 6200m, is a kind of high-quality paper pulp.
Embodiment 13
The product of last gained among the embodiment 3 is discongested with deflaker earlier, bleach then, at first carrying out oxygen floats, its oxygen addition is the 2-5% of oven dry stock amount, the addition of NaOH is for being the 2-6% of oven dry stock amount, add magnesium sulfate salt and make protective agent, the temperature that oxygen floats is 90-110 ℃, after one section oxygen floats end, bleach chlorination-alkali treatment-hypochlorite bleaching again in more traditional mode, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5, and the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 80%ISO, and fracture length is 5500m, is a kind of high-quality paper pulp.
Embodiment 14
The product of last gained among the above embodiment is discongested with deflaker earlier, bleach then, bleach in more traditional mode, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is the 2.5-3% of oven dry stock, the concentration of slurry is 3-3.5, and the temperature of bleaching is 50-55 ℃, and the time of bleaching is 45-60 minute; The condition of alkali treatment is: the amount that adds NaOH is oven dry stock amount 2-4%, and the concentration of slurry is 10-12%, and bleaching temperature is 50-55 ℃, and the time is 100-150 minute; Hypochlorite bleaching: the addition of clorox is the 2-4% of oven dry stock amount, and the temperature of bleaching is 30-35 ℃, and the time of bleaching is 100-150 minute.After bleaching finished, the whiteness of paper pulp was 78%ISO, and fracture length is 7500m, is a kind of high-quality paper pulp.

Claims (11)

1. method of utilizing press master that the grass high-hardness pulp is handled is characterized in that the high-hardness pulp hardness of gained is permanganate number 16-28 after the grass kind plant boiling; The beating degree of described high-hardness pulp before carrying out shove is 22-28 ° of SR; The beating degree of described high-hardness pulp after carrying out shove is 23-29 ° of SR.
2. method according to claim 1 is characterized in that described high-hardness pulp hardness is permanganate number 18-27.
3. method according to claim 1 is characterized in that described high-hardness pulp hardness is permanganate number 20-25.
4. method according to claim 1, it is characterized in that described method is: being the 8-15% high-hardness pulp with gained concentration after the grass kind plant boiling enters from the inlet of press master, carry out shove, after the extruding black liquor, concentration is that the slurry of 20-30% is discharged from the outlet of press master.
5. according to arbitrary described method among the claim 1-4, it is characterized in that described high-hardness pulp is grass kind plant raw material process Ammonium Sulfite Method boiling gained, the actual conditions of Ammonium Sulfite Method boiling is: the ammonium sulfite consumption is that liquor ratio is 1: 2-4 to over dry material quantity 9-13%; Heat temperature raising is to temperature is 100-120 ℃ time insulation 20-40 minute, carry out little steam bleeding after, continue heat temperature raising to 165-173 ℃, be incubated 60-90 minute.
6. according to arbitrary described method among the claim 1-4, it is characterized in that described high-hardness pulp is grass kind plant raw material process anthraquinone-soda cooking gained, the actual conditions of anthraquinone-soda cooking is: the consumption of NaOH is over dry material quantity 9-12%, liquor ratio is 1: 2-4, and the anthraquinone addition is the 0.5-0.8% of over dry material quantity; Heat temperature raising is incubated 20-40 minute when temperature is 100-120 ℃, carry out little steam bleeding, continues heat temperature raising to 165-173 ℃, is incubated 60-90 minute.
7. method according to claim 5, the Baume degrees that it is characterized in that the black liquor that shove is extruded is 7-9 ° of Be ' in the time of 20 ℃.
8. method according to claim 6, the Baume degrees that it is characterized in that the black liquor that shove is extruded is 9-11 ° of Be ' in the time of 20 ℃.
9. according to arbitrary described method among the claim 1-4, it is characterized in that described press master is to extract the acroll press washer that black liquor is used in the prior art.
10. method according to claim 9 is characterized in that described press master is the acroll press washer of reducing varying pitch.
11., it is characterized in that described grass kind plant is a kind of in wheat straw, straw, bagasse, cotton stalk, the reed or more than one mixing according to arbitrary described method among the claim 1-4.
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