CN101451312B - Method for preparing bleached chemical pulp by using grass type plants as raw materials - Google Patents
Method for preparing bleached chemical pulp by using grass type plants as raw materials Download PDFInfo
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- CN101451312B CN101451312B CN2008100938632A CN200810093863A CN101451312B CN 101451312 B CN101451312 B CN 101451312B CN 2008100938632 A CN2008100938632 A CN 2008100938632A CN 200810093863 A CN200810093863 A CN 200810093863A CN 101451312 B CN101451312 B CN 101451312B
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Abstract
The invention discloses a method for preparing bleached chemical pulp by taking a grass plant as a raw material, which comprises the following steps: the grass raw material is stewed to obtain high-hardness pulp of which the hardness has a potassium permanganate value of between 16 and 28; the high-hardness pulp is squeezed and scrubbed, and then is subjected to disintegration treatment; and the pulp after the disintegration treatment is subjected to two-stage oxygen delignification treatment and bleaching treatment to obtain the bleached chemical pulp. The fracture length of the bleached chemical pulp prepared by the method is between 5,200 and 8,000 meters, the folding resistance is between 30 and 70 times, and the bleached chemical pulp is high-quality grass bleached chemical pulp. In the preparation method, the stewing uses small amount of chemical reagent and has short time for stewing, so the preparation method is economic and environment-friendly.
Description
The application is that application number is the dividing an application for the application of " a kind of slurry of grass feedstock production and black liquor, its preparation method and application thereof " that 200710300209.X, the applying date be on December 5th, 2007, invention and created name.
Technical field
The present invention relates to a kind of paper pulp and preparation method thereof, more particularly, the present invention be a kind of be the method for feedstock production bleach chemical pulp with the grass kind plant.
Background technology
The method of producing paper pulp with string has: chemical method, Mechanical Method, chemical mechanical pulping.In chemical method, divide lime method, soda processes, anthraquinone-soda processes, sulfate process again.
The main component of paper is cellulose and hemicellulose, as the string of paper making raw material two kinds of lumber fibre and non-wood-fibers is arranged, and their main component is cellulose, hemicellulose and lignin.Slurrying is exactly one and goes out lignin as far as possible, keeps the process of cellulose and hemicellulose, and lumber fibre is the paper making raw material of high-quality, in paper industry, occupies very big advantage.Along with developing rapidly of industry; The timber supply and demand conflicts; Contradiction between the shortage day by day of the forest reserves and the demand of paper industry and other industrial development is remarkable day by day, and therefore, seeking non-wood-fiber paper making raw material resource is reality problem anxious to be solved again.
A grass type pulping technique is a system engineering; 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: heavily get the raw materials ready silica removal 1.; 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 to be prone to dissolve lignin 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 in the raw material is high, carbohydrate content is high, causes its black liquor viscosity high, and recovery difficult is big.4. grass contains a large amount of heteroproteose cells in being at present, and papermaking is formed a series of harm.5. the bleachability of straw pulp is good than timber, is prone to adopt short flow process, and chlorine-free bleaching reaches high whiteness.
The rice wheat straw is the cheap non-wood fibrous raw material of papermaking.Because fibre length is than big, between fiber contact more, the combination that helps being interweaved can increase the evenness smoothness and the transparency of paper.There is very abundant with cheap straw resource in China, fails fully rationally to utilize.According to statistics, China produces 1.78 hundred million tons of straw per year, 0.87 hundred million ton of wheat straw, but annual 5000000 tons of the rice wheat straw quantity not sufficients that consume of papermaking now, and the bleaching rice straw pulp can be copied into general cultural paper, uses the printing that can copy better quality, writes paper with the wood pulp collocation.
There are many technical staff to be devoted to the research of this respect, such as:
2003 the 4th phases of Heilungkiang papermaking have been delivered the article that is entitled as " Optimum Condition of Rice Straw Ammonium Sulfite Pulping "; This article discloses the optimal conditions of straw Ammonium Sulfite Method boiling; But digestion time is long in the method for this boiling, and the large usage quantity of ammonium sulfite makes that the energy that consumes is bigger; Cost is also bigger, and prepared pulp quality is not high.
2003 the 4th phases of Heilungkiang papermaking have been delivered the article that is entitled as " characteristics of wheat straw ammonium sulfite pulping and paper-making and application "; This article discloses the method to this special plant fiber material imonium legal system paper pulp of wheat straw, and the hardness of this method is low, and the time of insulation is long; The temperature of insulation is higher; And the concentration ratio of remaining ammonium sulfite is higher in the black liquor, exists consumes energy bigger equally, the problem that pulp quality is not high.
Chemistry of forest product has been delivered the article that is entitled as " masson pine pulping with ammonium sulfite method " with 1981 the 4th phases of industry; This article is disclosed to be to be the prepared slurry of raw material ammonium sulfite cooking process with the masson pine; The consumption of imonium is 20-25% in this method; Stewing temperature has reached 163-165 ℃, temperature retention time 5-6 hour.This method is to be raw material with trees, in today that the forest reserves lack, is that the problem of raw material papermaking is more and more outstanding with trees.
2002 the 2nd phases of periodical have been delivered the article that is entitled as " straw low-pressure low-temperature pulp-making research " during chemical industry; This article is raw material with the straw; The step of pass through pre-preg, boiling, wash sieve, bleaching has obtained bleached pulp, and the temperature retention time of this method reaches 3.5 hours, needs to consume mass energy.
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 superior to grass as raw material, and needlebush is superior to 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.
Summary of the invention
Another object of the present invention is to provide a kind of is the preparation method of the bleach chemical pulp of raw material with the grass kind plant.
To achieve these goals, the technical scheme of the present invention's employing is:
A kind of is the method for feedstock production bleach chemical pulp with the grass kind plant, and described method may further comprise the steps:
(1) the grass kind plant raw material is carried out boiling and obtain the high-hardness pulp that hardness is permanganate number 16-28;
(2) said high-hardness pulp is carried out shove, processing is discongested in washing then;
(3) will through the slurry of discongesting processing and carry out two sections oxygen delignification and bleaching processing, obtain described bleach chemical pulp.
Grass kind plant raw material of the present invention is one or more the combination in straw, wheat straw, cotton stalk, bagasse or the reed.
Two sections oxygen delignification of the present invention are:
(1) will pass through the slurry of discongesting processing and send into the oxygen delignification reaction tower, is 85-95 ℃ in inlet temperature earlier, and pressure is 0.8-1.0MPa, and outlet temperature is 98-100 ℃, and pressure is to carry out one section oxygen delignification 40-60 minute under the condition of 0.5-0.7MPa;
(2) will be 98-100 ℃ in inlet temperature through the slurry after one section oxygen delignification, pressure be 0.5-0.7MPa, and outlet temperature is 103-108 ℃, and pressure is to carry out two sections oxygen delignification 20-40 minutes under the condition of 0.2-0.4MPa.
When carrying out oxygen delignification, add aqueous slkali in the slurry after discongesting among the present invention, wherein alkali charge is that the addition of oxygen is slurry 20-40kg per ton in the 2-4% of NaOH to the oven dry stock amount.Boiling of the present invention is a kind of in ammonium sulfite boiling, anthraquinone-soda cooking or the kraft cooking; Described ammonium sulfite boiling is:
(1) in the grass kind plant raw material, add steaming preparation, wherein the consumption of ammonium sulfite is to over dry material quantity 9-13%, and liquor ratio is 1: 2-4;
(2) feed steam and heat, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
Described anthraquinone-soda cooking is:
(1) in the grass kind plant raw material, add steaming preparation, wherein alkali charge in NaOH to over dry material quantity 9-12%, liquor ratio is 1: 2-4, the anthraquinone addition is the 0.5-0.8% of over dry material quantity;
(2) feed steam and heat, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
Described kraft cooking is:
(1) in the grass kind plant raw material, add steaming preparation, wherein alkali charge in NaOH to over dry material quantity 8-11%, liquor ratio is 1: 2-4, sulphidity are 5-15%;
(2) feed steam and heat, insulation was 20-40 minute when heat temperature raising to temperature was 110-140 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
Shove described in the present invention is: said high-hardness pulp is regulated concentration inlet from press master to the 8-15% get into, under the effect of extruding force, carry out shove, after the extruding black liquor, concentration is that the slurry of 20-35% is discharged from the outlet of press master.
Press master of the present invention is to extract reducing single-screw press master or the Var-nip press that black liquor is used in the prior art.
To be clear water or the concentration of utilizing normal temperature wash in three sections vacuum pulp washing machines for cleaning solution for the black liquor of 3-6.2 ° of Be ' and pH8-8.3 pulp washing of the present invention.
Of the present invention discongesting to utilizing fluffer to discongest in the slurry behind the pulp washing makes fibre structure become loose.
Fluffer of the present invention is a kind of in mill fluffer or the defibrator in deflaker, kneading machine, dry pan, the beating equipment.
Bleaching of the present invention is handled and is comprised chlorination, alkali treatment, post-bleach.
Chlorination of the present invention is: at chlorine dosage is the 2.5-3% of oven dry stock, and the concentration of slurry is 3-3.5%, and temperature is to handle 45-60 minute under 50-55 ℃ the condition; Described alkali treatment is: alkali charge in NaOH to oven dry stock amount 2-4%, the concentration of slurry is 10-12%, temperature is to handle 100-150 minute under 50-55 ℃ the condition; Described post-bleach is: the addition at clorox is the 2-4% of oven dry stock amount, and temperature is to handle 100-150 minute under 30-35 ℃ the condition.
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%.
Bleach chemical pulp of the present invention is a feedstock production with the grass kind plant, and its fracture length reaches more than 5200 meters; Folding strength reaches more than 30 times; Beating degree is 25-36 ° of SR, is a kind of high-quality chemical pulp, can be used as the slurry that the high-quality cultural paper is produced in preparation.And raw material used among the present invention is a grass kind plant, comprises straw, wheat straw, cotton stalk, bagasse, reed etc., and these raw materials are very abundant, and price is low.Bleach chemical pulp described in the present invention can be copied into general cultural paper, because the function admirable of itself, therefore when the higher-quality paper of preparation; Compared with prior art; Can use with wood pulp collocation still less,, alleviate the contradiction between high-quality paper demand and the timber resources shortage greatly therefore in today that the forest reserves lack day by day; Simultaneously also reduced the production cost of enterprise, for enterprise brings good economic benefit.
In the method for the invention, at first can adopt prior art that raw material is got the raw materials ready, promptly adopt conventional dried, wet feed preparation,, can alleviate the pressure of subsequent technique like this, and improve the quality of straw pulp to remove impurity such as defoliation, fringe, grain, marrow.Dried, wet feed preparation can adopt existing conventional equipment, like chaffcutter, screening machine, dust removal machine, wet scrubbing Straw-crumbling machine, inclined screw Water Extraction Machinery etc.Fibers in grass class raw material through the removal moisture after getting the raw materials ready also can be fine fodder, and the moisture of deduction dogstail is the over dry grass, and the length of general blade is at 15-30mm, and the technology of getting the raw materials ready of raw material is technology as well known to those skilled in the art.
Then raw material is carried out impregnation process; Maceration extract is flooded the fibers in grass class raw material; Make liquor ratio reach 1: 2-4, in insulation and mixing more than 10 minutes in the spiral macerator more than 85 ℃, wherein insulation mixes 10-40 minute for well between 85-95 ℃ under normal pressure.Maceration extract is fully contacted with raw material, make the dipping of raw material evenly complete.Described maceration extract can be certain density aqueous slkali, as being 4% sodium hydroxide solution, also can be the mixed liquor of alkali and black liquor to the over dry material quantity, and the concentration of used black liquor is 11-14 ° of Be ' (20 ℃).Raw material has been carried out impregnation process; Utilized black liquor as waste material; Make black liquor obtain cycling and reutilization, reduced the pressure that environment is handled black liquor, because to the preliminary treatment of raw material dipping; Make that heteroproteose cell, hemicellulose, the lignin when heat treated, deviate from are that main black liquid separation is discharged, for next step digestion process is prepared.
Ensuing digestion process is the committed step of slurrying, because institutional framework, microstructure, chemical composition and the lignin molecular structure etc. of timber and grass as raw material are all variant, therefore, the delignification reaction course also has very big difference in digestion process.For grass as raw material alkaline cooking delignification reaction course, comprise intensification and be incubated two sections.The common feature of grass as raw material is that delignification is more or less freely, and compares with wood raw material, and the temperature of a large amount of strippings of lignin is more in advance.When the grass as raw material sulphate cook, just find the secondary wall lignin, meet born of the same parents subtract the layer and cell angle block element all remove simultaneously at the very start in boiling.Grass as raw material generally contains more hemicellulose and less lignin, and hemicellulose mainly is present in cell and stands like a wall, and this just helps the process of boiling delignification.In the method for the present invention, boiling chemical liquid consumption is few, and the time of boiling and insulation is short, in a large amount of lignins of removing in the grass raw material, has reduced the degraded and the damage of cellulose and hemicellulose as much as possible.Can adopt ammonium sulfite boiling, Arbiso process, anthraquinone-soda processes, sulfate process etc. to carry out boiling in the method for the present invention.
Through the high-hardness pulp of gained after the boiling, hardness is equivalent to card uncle valency 24-50 for permanganate number 16-28 in the method for the present invention; 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.
High-hardness pulp among the present invention is as the raw material of preparation bleach chemical pulp, and the boiling method of high-hardness pulp can be ammonium sulfite, sulfate process, anthraquinone-soda processes.In the process of the boiling of prior art, this several method exists the time of boiling and insulation long when preparing paper pulp, and stewing temperature is high, the problem that temperature retention time is long.And in the method for the invention, the consumption of cooking liquor is few, and the time of boiling and insulation shortens greatly.In the boiling method of the present invention; Through consumption and concentration to cooking liquor, the length of boiling and temperature retention time, the height of boiling temperature carries out systematic research; Under the condition that reduces the infringement of cellulose and hemicellulose as much as possible, carry out boiling; Both reduce production cost thereby reach, energy savings can improve the purpose of the yield of slurrying again.The yield of the resulting high-hardness pulp of described boiling method is 58-68%.
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.Dilution can be clear water, also can be the used black liquor of aforementioned impregnation process.The concentration of the high-hardness pulp in the spraying pot is 8-15% at this moment, and hardness is equivalent to card uncle valency 26-50 for permanganate number 16-28, and beating degree is 22-28 ° of SR; Be connected through delivery pump between spraying pot and the acroll press washer; Delivery pump is transported to the inlet of acroll press washer with the high-hardness pulp in the spraying pot, and high-hardness pulp gets into from the inlet of acroll press washer, through after the shove; Above-mentioned high-hardness pulp is seen off from the outlet of press master; The concentration of the slurry of seeing off is brought up to 20-30% by 8-15%, has become the high-hardness pulp of high concentration, and temperature is 70-80 ℃.In shove, most of black liquor is extruded the back and in the black liquor groove, stores.The press master of being selected for use is to extract the press master that black liquor is used in the prior art, is preferably the single-screw press master or the Var-nip press of reducing.
When using press master to carry out shove; Because the process at shove can produce very big extruding force, temperature rises rapidly, impels fiber separation, divides 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 through 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.The press master that the present invention selected for use, after high-hardness pulp was carried out shove, the beating degree of described high-hardness pulp changed little, and beating degree is 22-28 ° of SR before the shove, and beating degree is 23-29 ° of SR after the shove.That is to say that described high-hardness pulp can the fibre length that fibers in grass class is intrinsic keep relatively goodly through after the press master shove, reduces the damage of fiber preferably.
The slurry that will from shove, come out through jumping the sieve screening, washs earlier then, can adopt vacuum pulp washing machine or pressure washer to wash.Go out the concentration of starching behind the wash engine between 9-11%, this slurry is delivered to fluffer through conveying worm handle, the button degree of separating of handling the back slurry is 26-28 ° of SR, weight in wet base 1.5-1.7g, temperature 65-70 ℃.Described fluffer is the existing equipment of discongesting, like deflaker, and the mill fluffer.Through discongesting, can fiber be rubbed with the hands and open, the lignin between fiber and the fiber is exposed out, helps the carrying out of the bleaching process of back.
To pass through and discongest gained slurry and carry out two sections oxygen delignifications, described two sections oxygen delignification are:
(1) will pass through the slurry of discongesting processing and send into the oxygen delignification reaction tower, is 85-95 ℃ in inlet temperature earlier, and pressure is 0.8-1.0MPa, and outlet temperature is 98-100 ℃, and pressure is to carry out one section oxygen delignification 40-60 minute under the condition of 0.5-0.7MPa;
(2) will be 98-100 ℃ in inlet temperature through the slurry after one section oxygen delignification, pressure be 0.5-0.7MPa, and outlet temperature is 103-108 ℃, and pressure is to carry out two sections oxygen delignification 20-40 minutes under the condition of 0.2-0.4MPa.The hardness k value (permanganate number) of starching this moment is reduced to 11-13 and is equivalent to card uncle valency 12.5-17, and beating degree is 30--36 ° of SR.
Adopt two sections above-mentioned oxygen delignify treating methods; Slurry after discongesting is mixed with alkali and oxygen under lower temperature earlier fully; Make to expose to be removed, and then under higher temperature, carry out oxygen delignification, do like this and can under gentle more condition, remove lignin at the outside lignin of fiber; Reduce cellulosic degraded, increase the intensity of slurry.
After carrying out two sections oxygen delignifications, can adopt the method for bleaching of prior art to bleach; Like C-E-H tri-stage bleaching, wherein chlorination: chlorine dosage is the 2.5-3% of oven dry stock, and 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: alkali charge in NaOH to oven dry stock amount 2-4%, the concentration of slurry is 10-12%, bleaching temperature is 50-55 ℃, 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.Also can directly bleach by above-mentioned C-E-H mode discongesting the gained slurry, bleaching obtains bleach chemical pulp after finishing.
The invention has the beneficial effects as follows: be the bleach chemical pulp of feedstock production with the grass kind plant, beating degree is 25-36 ° of SR, and fracture length is 5200-8000m, and folding number is 30-70, and whiteness is 68-82%ISO, and the delignification rate is 84-98%.Described bleach chemical pulp can be used as the slurry that the high-quality cultural paper is produced in preparation.And raw material used among the present invention is a grass kind plant, comprises straw, wheat straw, cotton stalk, bagasse, reed etc., and these raw materials are very abundant, and price is low.Bleach chemical pulp described in the present invention can be copied into general cultural paper, because the function admirable of itself, therefore when the higher-quality paper of preparation; Compared with prior art; Can use with wood pulp collocation still less,, alleviate the contradiction between high-quality paper demand and the timber resources shortage greatly therefore in today that the forest reserves lack day by day; Simultaneously also reduced the production cost of enterprise, for enterprise brings good economic benefit.Among the preparation method of the present invention,, shorten the time of boiling, prepare the high-hardness pulp of high rigidity through reducing the consumption of cooking liquor.The minimizing of chemical liquid consumption and the shortening of digestion time all can reduce the enterprise production cost greatly, and yield is greatly improved, thereby have improved production efficiency greatly.Simultaneously; High-hardness pulp of the present invention can be used as the raw material of preparation bleach chemical pulp; 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.
The specific embodiment
Embodiment 1
Wheat straw through the ammonium sulfite boiling, is specially pre-preg and adopts 4% sodium hydroxide solution, and the ammonium sulfite addition is 10% of an over dry material quantity; Liquor ratio 1: 4; Heat temperature raising to 110 ℃ for the first time, insulation is 20 minutes under this temperature, littler steam bleeding 20-30 minute; Post bake heat up 30 minutes to temperature be 168 ℃, be incubated 90 minutes.Obtain hardness and be 20 be equivalent to card uncle valency 31 high-hardness pulp.With concentration is that 10% high-hardness pulp reducing single-screw press master carries out shove; Obtain 25% slurry; Utilize three sections vacuum pulp washing machines to wash then, the slurry after the washing is discongested through deflaker, again through conveying worm heating this slurry to 70 ℃ and be transported to middle underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before getting into reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for oven dry stock weight 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 1% of an oven dry stock weight, is 85 ℃ in inlet temperature earlier, and pressure is 0.9MPa; Outlet temperature is 98 ℃, and pressure is to carry out one section oxygen delignification 50 minutes under the condition of 0.6MPa; To be 98 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.6MPa, and outlet temperature is 108 ℃, and pressure is to carry out two sections oxygen delignification 30 minutes under the condition of 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution; With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards; Traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3.2%; The temperature of bleaching is 55 ℃, and the time of bleaching is 45 minutes; The amount that the E section adds NaOH is an oven dry stock amount 2.5%, and the concentration of slurry is 12%, and bleaching temperature is 50 ℃, and the time is 120 minutes; The addition of H section clorox is 3% of an oven dry stock amount, and the temperature of bleaching is 30 ℃, and the time of bleaching is 120 minutes, and can obtain whiteness is 82%ISO, 6500 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 45 times.
Embodiment 2
Through the caustic soda-anthraquinone method boiling, being specially the caustic soda addition is 10% of over dry material quantity with straw, and the anthraquinone addition is 0.7% of an over dry material quantity; Liquor ratio 1: 4; Heat temperature raising to 110 ℃ for the first time, insulation is 20 minutes under this temperature, littler steam bleeding 20-30 minute; For the second time heat temperature raising 30 minutes to temperature is 168 ℃, is incubated 90 minutes.Obtain hardness after the boiling and be 22 be equivalent to card uncle valency 36 high-hardness pulp; Regulating and obtaining concentration after the concentration is 12% slurry, and after sending into Var-nip press and carrying out shove, black liquor is extruded; Obtain concentration and be 25% slurry; Regulate with warm water and to send into three sections vacuum pulp washing machines after the concentration and carry out pulp washing, adopt kneading machine to discongest then, again this slurry to 60 of heating ℃ and be transported to the oxygen delignification reaction tower through the positive displacement middle underflow pump.This slurry before getting into reaction tower in pipeline with the oxygen of the 40kg slurry per ton that adds and alkalinity for oven dry stock weight 2% is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 2% of an oven dry stock weight, is 95 ℃ in inlet temperature earlier, and pressure is 1.0MPa; Outlet temperature is 100 ℃, and pressure is to carry out one section oxygen delignification 40 minutes under the condition of 0.7MPa; To be 100 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.7MPa, and outlet temperature is 108 ℃, and pressure is to carry out two sections oxygen delignification 20 minutes under the condition of 0.4MPa.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 4% of an oven dry stock, and the concentration of slurry is 3%, and the temperature of bleaching is 55 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 2%, and the concentration of slurry is 12%, and bleaching temperature is 52 ℃, and the time is 100 minutes; The addition of H section clorox is 3% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 100 minutes, and can obtain whiteness is 74%ISO, 5500 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 35 times.
Embodiment 3
Through the ammonium sulfite boiling, be specially the sodium hydroxide solution hybrid infusion of using over dry raw material 4% after wheat straw and reed mixed according to 1: 1, send into rotary spherical digester then; Adding is to the ammonium sulfite of over dry material quantity 11.5%, liquor ratio 1: 3, heat temperature raising to 100 ℃ for the first time; Insulation is 20 minutes under this temperature; Again little steam bleeding 20-30 minute, for the second time heat temperature raising 30 minutes to temperature was 165 ℃, is incubated 60 minutes.Obtain hardness after the boiling and be 18 be equivalent to card uncle valency 27 slurry; Carry out shove through reducing single-screw press master after will starching adjusting concentration to 12%; Obtain concentration after the shove and be 20% slurry; Wash with three sections vacuum pulp washing machines again, then heating this slurry to 76 ℃ and be transported to the oxygen delignification reaction tower through the positive displacement middle underflow pump.This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 95 ℃ in inlet temperature earlier, and pressure is 1.0MPa; Outlet temperature is 100 ℃, and pressure is to carry out one section oxygen delignification 55 minutes under the condition of 0.65MPa; To be 100 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.65MPa, and outlet temperature is 108 ℃, and pressure is to carry out two sections oxygen delignification 25 minutes under the condition of 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, this moment, the hardness K (permanganate number) of slurry was reduced to 13, and beating degree is 32 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 4% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 50 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 10%, and bleaching temperature is 52 ℃, and the time is 150 minutes; The addition of H section clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 80%ISO, 7000 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 50 times.
Embodiment 4
Through the cotton stalk process dipping screw machine behind the dry raw material preparation; In the dipping screw machine with alkalinity in NaOH being 4% sodium hydroxide solution mixed liquor hybrid infusion to the cotton stalk amount of over dry; Send into rotary spherical digester then, add the over dry material quantity is added steaming preparation in rotary spherical digester, wherein the consumption of ammonium sulfite is to over dry material quantity 12%; Liquor ratio 1: 2.5, cotton stalk are filled back rotary spherical digester idle running 20 minutes; Afterwards, logical steam carries out heat temperature raising one time, is warming up to 120 ℃, and insulation is 40 minutes under this temperature, and littler steam bleeding 20-30 minute, post bake began logical steam, heat up 30 minutes to temperature be 173 ℃, be incubated 90 minutes; Before spurting, in rotary spherical digester, add black liquor and dilute, pressure keeps 0.75MPa to spurt simultaneously, and this moment, the hardness of slurry was that permanganate number 16 is equivalent to card uncle valency 24, and the pH value is 12 during boiling end, and the residual ammonium concentration in the black liquor is 9g/l.The yield of described high-hardness pulp is 66%.With the intact hardness of gained afterwards of boiling is the high-hardness pulp adjusting concentration to 15% that permanganate number 23 is equivalent to card uncle valency 37; Send into Var-nip press again and carry out shove; Obtain concentration and be 38% slurry; In three sections vacuum pulp washing machines, carry out pulp washing with warm water dilution back, discongest with dry pan then, again this slurry to 76 of heating ℃ and be transported to the oxygen delignification reaction tower through the positive displacement middle underflow pump.This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 90 ℃ in inlet temperature earlier, and pressure is 0.85MPa; Outlet temperature is 99 ℃, and pressure is to carry out one section oxygen delignification 45 minutes under the condition of 0.55MPa; To be 99 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.5MPa, and outlet temperature is 105 ℃, and pressure is to carry out two sections oxygen delignification 25 minutes under the condition of 0.25MPa.Bleach with more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3%5, and the temperature of bleaching is 55 ℃, and the time of bleaching is 60 minutes; The condition of alkali treatment be alkali charge be in NaOH to oven dry stock amount 3%, the concentration of slurry is 12%, bleaching temperature is 52 ℃, the time is 150 minutes; Hypochlorite bleaching: the addition of clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 35 ℃, and the time of bleaching is 100 minutes.After bleaching finished, the whiteness of said bleach chemical pulp was 72%ISO, and fracture length is 8000m, and folding strength is 70 times, is a kind of high-quality slurry.
Embodiment 5
Straw is carried out anthraquinone-soda cooking: add steaming preparation, wherein alkali charge in NaOH to over dry material quantity 9%, wherein liquor ratio is 1: 2, the anthraquinone addition is 0.6% of an over dry material quantity; Feed steam and heat, insulation was 20 minutes when heat temperature raising to temperature was 120 ℃, carried out little steam bleeding, continued heat temperature raising to 165 ℃, be incubated 60 minutes, obtained hardness and was 28 and be equivalent to the high-hardness pulp of card primary valency 50.Earlier carry out shove with the single-screw press master; Through shove black liquor is extruded; Impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with three sections suction washers afterwards, and high-hardness pulp is diluted to concentration is 8-12% after the washing, then this slurry to 76 of heating ℃ and be transported to the oxygen delignification reaction tower through the positive displacement middle underflow pump.This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 88 ℃ in inlet temperature earlier, and pressure is 0.95MPa; Outlet temperature is 99 ℃, and pressure is to carry out one section oxygen delignification 60 minutes under the condition of 0.65MPa; To be 99 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.65MPa, and outlet temperature is 106 ℃, and pressure is to carry out two sections oxygen delignification 20 minutes under the condition of 0.4MPa.Bleach with more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is 2.5% of an oven dry stock, and the concentration of slurry is 3%, and the temperature of bleaching is 50 ℃, and the time of bleaching is 55 minutes; The condition of alkali treatment is: alkali charge in NaOH to oven dry stock amount 4%, the concentration of slurry is 11%, bleaching temperature is 54 ℃, the time is 120 minutes; Hypochlorite bleaching: the addition of clorox is 4% of an oven dry stock amount, and the temperature of bleaching is 35 ℃, and the time of bleaching is 150 minutes.After bleaching finished, the whiteness of described bleach chemical pulp was 75%ISO, and fracture length is 5200m, and folding strength 30 times is a kind of high-quality slurry.
Embodiment 6
Reed is carried out anthraquinone-soda cooking: alkali charge in NaOH to over dry material quantity 9%, liquor ratio is 1: 2, the anthraquinone addition is 0.6% of an over dry material quantity; Feed steam and heat, insulation was 20 minutes when heat temperature raising to temperature was 115 ℃, carried out little steam bleeding, continued heat temperature raising to 165 ℃, was incubated 60 minutes.The hardness of the intact gained afterwards of boiling is carried out shove with the single-screw press master earlier for the high-hardness pulp that permanganate number 18-20 is equivalent to card uncle valency 29-33; Through shove black liquor is extruded; Impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with three sections vacuum pulp washing machines afterwards, after the washing high-hardness pulp is diluted, and being diluted to concentration is 5-12%; And then discongest this slurry to 76 of heating ℃ and be transported to the oxygen delignification reaction tower then with the mill fluffer through the positive displacement middle underflow pump.This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 92 ℃ in inlet temperature earlier, and pressure is 0.85MPa; Outlet temperature is 98 ℃, and pressure is to carry out one section oxygen delignification 48 minutes under the condition of 0.55MPa; To be 98 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.55MPa, and outlet temperature is 104 ℃, and pressure is to carry out two sections oxygen delignification 38 minutes under the condition of 0.25MPa.Bleach with more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is 2.5% of an oven dry stock, and the concentration of slurry is 3%, and the temperature of bleaching is 50 ℃, and the time of bleaching is 60 minutes; The condition of alkali treatment is: alkali charge in NaOH to oven dry stock amount 3%, the concentration of slurry is 10%, bleaching temperature is 55 ℃, the time is 140 minutes; Hypochlorite bleaching: the addition of clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 35 ℃, and the time of bleaching is 110 minutes.After bleaching finished, the whiteness of paper pulp was 72%ISO, and fracture length is 5500m, and folding strength is 60 times, is a kind of high-quality slurry.
Embodiment 7
Straw is carried out the Arbiso process boiling, in straw, add total acid 5%, the cooking liquor of combined acid 2%; Feed steam in the boiling vessel and heat, insulation was 30 minutes when heat temperature raising to temperature was 110 ℃, carried out little steam bleeding, continued heat temperature raising to 170 ℃, was incubated 60 minutes, and obtaining hardness is that permanganate number is 24.Said high-hardness pulp carries out shove with the single-screw press master earlier; Through shove black liquor is extruded; Impurity in the black liquor is also discharged in company with black liquor together simultaneously; Slurry with gained washs with suction washer afterwards, after the washing high-hardness pulp is diluted, and being diluted to concentration is 8-12%; This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.After this slurry in blender, get into the oxygen delignification reaction tower after fully mixed; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 90 ℃ in inlet temperature earlier, and pressure is 1.0MPa; Outlet temperature is 99 ℃, and pressure is to carry out one section oxygen delignification 60 minutes under the condition of 0.7MPa; To be 99 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.7MPa, and outlet temperature is 106 ℃, and pressure is to carry out two sections oxygen delignification 35 minutes under the condition of 0.4MPa.Bleach with more traditional mode again, chlorination-alkali treatment-hypochlorite bleaching, the condition of bleaching is: chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 53 ℃, and the time of bleaching is 60 minutes; The condition of alkali treatment is: alkali charge in NaOH to oven dry stock amount 4%, the concentration of slurry is 10%, bleaching temperature is 50 ℃, the time is 130 minutes; Hypochlorite bleaching: the addition of clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 33 ℃, and the time of bleaching is 150 minutes.After bleaching finished, the whiteness of paper pulp was 78%ISO, and fracture length is 6400m, and folding strength is 40 times, is a kind of high-quality paper pulp.
Embodiment 8
Straw and bagasse were mixed after the persulfuric acid bisulfite cooking is specially sodium hydroxide solution and the black liquor mixed liquor hybrid infusion used over dry material quantity 4% according to 1: 1, send into rotary spherical digester then; Adding is to the soda bath of over dry material quantity 12%, and sulphidity is 10%, liquor ratio 1: 2.5; Heat temperature raising to 140 ℃ for the first time, insulation is 40 minutes under this temperature, littler steam bleeding 20-30 minute; For the second time heat temperature raising 30 minutes to temperature is 173 ℃, is incubated 90 minutes.Obtain hardness after the boiling and be 28 be equivalent to card uncle valency 50 slurry, through carrying out pulp washing with three sections vacuum pulp washing machines again behind the Var-nip press shove, discongest with defibrator then, again through this slurry to 80 of conveying worm heating ℃ and be transported to middle underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal high density stock pump is transported to the oxygen delignification reaction tower.This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 95 ℃ in inlet temperature earlier, and pressure is 0.9MPa; Outlet temperature is 100 ℃, and pressure is to carry out one section oxygen delignification 58 minutes under the condition of 0.5MPa; To be 100 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.57MPa, and outlet temperature is 104 ℃, and pressure is to carry out two sections oxygen delignification 20-40 minutes under the condition of 0.3MPa.This slurry is spurted stock tank and dilution, and this moment, the hardness K (permanganate number) of slurry was reduced to 12, and beating degree is 34 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 52 ℃, and the time of bleaching is 45 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 11%, and bleaching temperature is 50 ℃, and the time is 150 minutes; The addition of H section clorox is 2.5% of an oven dry stock amount, and the temperature of bleaching is 30 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 78%ISO, fracture length 6500m, the high-quality dogstail slurry that folding strength is 50 times.
Embodiment 9
Through ammonium sulfite-anthraquinone boiling, be specially that adding is to the ammonium sulfite solution of over dry material quantity 13% in the rotary spherical digester after wheat straw, cotton stalk and bagasse mixed according to 1: 1: 1, the anthraquinone addition is 0.8% of an over dry material quantity; Liquor ratio 1: 3; Heat temperature raising to 100 ℃ for the first time, insulation is 20 minutes under this temperature, littler steam bleeding 20-30 minute; For the second time heat temperature raising 30 minutes to temperature is 165 ℃, is incubated 60 minutes.Obtain hardness after the boiling and be 26 be equivalent to card uncle valency 45 slurry; Through washing with three sections vacuum pulp washing machines again behind the reducing single-screw press master shove; Utilize deflaker to discongest then, again through heating this slurry to 70 ℃ and through single rotor formula high density stock pump be transported to that oxygen floats reaction tower and in pipeline feeding steam should starch heat temperature raising.This slurry before getting into reaction tower in pipeline with the oxygen of the 30kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.5% of an oven dry stock weight, is 85 ℃ in inlet temperature earlier, and pressure is 0.8MPa; Outlet temperature is 98 ℃, and pressure is to carry out one section oxygen delignification 40-60 minute under the condition of 0.5MPa; To be 98 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.5MPa, and outlet temperature is 103 ℃, and pressure is to carry out two sections oxygen delignification 40 minutes under the condition of 0.2MPa.After finishing dealing with this slurry is spurted stock tank and dilution, the hardness K (permanganate number) that starches this moment is reduced to 10 and is equivalent to card uncle valency 13, and beating degree is 36 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 3% of an oven dry stock, and the concentration of slurry is 3%, and the temperature of bleaching is 52 ℃, and the time of bleaching is 50 minutes; The amount that the E section adds NaOH is an oven dry stock amount 3%, and the concentration of slurry is 12%, and bleaching temperature is 50 ℃, and the time is 100 minutes; The addition of H section clorox is 2.5% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 78%ISO, 6300 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 45 times.
Embodiment 10
Straw, bagasse and reed were mixed according to 1: 1: 1 after the persulfuric acid bisulfite cooking, be specially in the dipping screw machine with alkali charge in aqueous slkali and the black liquor mixed liquor hybrid infusion of NaOH to over dry material quantity 4%, send into rotary spherical digester then; In rotary spherical digester, add steaming preparation, wherein alkali charge in NaOH to 9% of over dry material quantity, sulphidity is 15%; Liquor ratio 1: 3, afterwards, logical steam carries out the heat temperature raising first time; Be warming up to 120 ℃, insulation is 20 minutes under this temperature, littler steam bleeding 20-30 minute; Heating for the second time begins logical steam, heat up 30 minutes to temperature be 165 ℃, be incubated 60 minutes.Obtain hardness after the boiling and be 22 be equivalent to card uncle valency 35 slurry; Carry out shove through Var-nip press again; Send into three sections vacuum pulp washing machines then and wash, utilize kneading machine to discongest then, be transported to the oxygen delignification reaction tower through heating this slurry to 80 ℃ and through the positive displacement high density stock pump again.The oxygen that adds 35kg slurry per ton in the reaction tower and alkalinity in NaOH to oven dry stock amount 3% aqueous slkali, and feeding steam should be starched heat temperature raising in pipeline.Protective agent is a magnesium sulfate, and addition is 0.8% of an oven dry stock weight, and this slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 95 ℃ in inlet temperature earlier, and pressure is 1.0MPa; Outlet temperature is 100 ℃, and pressure is to carry out one section oxygen delignification 60 minutes under the condition of 0.7MPa; To be 100 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.7MPa, and outlet temperature is 108 ℃, and pressure is to carry out two sections oxygen delignification 40 minutes under the condition of 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, the hardness K (permanganate number) that starches this moment is reduced to 10 and is equivalent to card uncle valency 13, and beating degree is 38 ° of SR.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 4% of an oven dry stock, and the concentration of slurry is 3.2%, and the temperature of bleaching is 50 ℃, and the time of bleaching is 45 minutes; E section alkali charge in NaOH to oven dry stock amount 3%, the concentration of slurry is 12%, bleaching temperature is 52 ℃, the time is 120 minutes; The addition of H section clorox is 2% of an oven dry stock amount, and the temperature of bleaching is 30 ℃, and the time of bleaching is 150 minutes, and can obtain whiteness is 81%ISO, 6800 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 48 times.
Embodiment 11
Bagasse through the ammonium sulfite boiling, is specially in rotary spherical digester and adds the ammonium sulfite solution to over dry material quantity 11%, and liquor ratio 1: 4 is filled the back rotary spherical digester and was dallied 20 minutes; Afterwards, logical steam carries out the heat temperature raising first time, is warming up to 110 ℃, and insulation is 20 minutes under this temperature, and littler steam bleeding 20-30 minute, heating for the second time began logical steam, heat up 30 minutes to temperature be 168 ℃, be incubated 90 minutes.Obtain hardness after the boiling and be 20 be equivalent to card uncle valency 31 slurry; Carry out shove with reducing single-screw press master again; Get into then in three sections vacuum pulp washing machines and wash, utilize defibrator through conveying worm heating this slurry to 60 ℃ and be transported to middle underflow pipe again.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, floats reaction tower after centrifugal middle underflow pump is transported to oxygen.This slurry mixed with the oxygen of the 40kg slurry per ton that adds and the NaOH of oven dry stock weight 4% in pipeline before getting into reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry gets into the oxygen delignification reaction tower after fully mixed in blender afterwards; Protective agent is a magnesium sulfate; Addition is 0.2% of an oven dry stock weight, is 95 ℃ in inlet temperature earlier, and pressure is 1.0MPa; Outlet temperature is 99 ℃, and pressure is to carry out one section oxygen delignification 40 minutes under the condition of 0.7MPa; To be 100 ℃ in inlet temperature through the slurry after one section oxygen delignification again, pressure be 0.7MPa, and outlet temperature is 108 ℃, and pressure is to carry out two sections oxygen delignification 40 minutes under the condition of 0.4MPa.With pump the stock pump of dilution is gone into two sections vacuum pulp washing machine washings afterwards, traditional CEH tri-stage bleaching is adopted in the back, and be specially: C section chlorine dosage is 5% of an oven dry stock, and the concentration of slurry is 3.5%, and the temperature of bleaching is 52 ℃, and the time of bleaching is 50 minutes; E section alkali charge in NaOH to oven dry stock amount 2%, the concentration of slurry is 10%, bleaching temperature is 55 ℃, the time is 150 minutes; The addition of H section clorox is 2.5% of an oven dry stock amount, and the temperature of bleaching is 32 ℃, and the time of bleaching is 100 minutes, and can obtain whiteness is 77%ISO, 5500 meters of fracture lengths, the high-quality dogstail slurry that folding strength is 40 times.
Claims (8)
1. one kind is the method for feedstock production bleach chemical pulp with the grass kind plant, it is characterized in that described method may further comprise the steps:
(1) the grass kind plant raw material is carried out boiling and obtain the high-hardness pulp that hardness is permanganate number 16-28;
(2) said high-hardness pulp is carried out shove, processing is discongested in washing then;
(3) will through the slurry of discongesting processing and carry out two sections oxygen delignification and bleaching processing, obtain described bleach chemical pulp;
Described two sections oxygen delignification are:
(1) will pass through the slurry of discongesting processing and send into the oxygen delignification reaction tower, is 85-95 ℃ in inlet temperature earlier, and pressure is 0.8-1.0MPa, and outlet temperature is 98-100 ℃, and pressure is to carry out one section oxygen delignification 40-60 minute under the condition of 0.5-0.7MPa;
(2) will be 98-100 ℃ in inlet temperature through the slurry after one section oxygen delignification, pressure be 0.5-0.7MPa, and outlet temperature is 103-108 ℃, and pressure is to carry out two sections oxygen delignification 20-40 minutes under the condition of 0.2-0.4MPa;
Described boiling is a kind of in ammonium sulfite boiling, anthraquinone-soda cooking or the kraft cooking; Described ammonium sulfite boiling is:
(1) in the grass kind plant raw material, add steaming preparation, wherein the consumption of ammonium sulfite is to over dry material quantity 9-13%, and liquor ratio is 1: 2-4;
(2) feed steam and heat, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute;
Described anthraquinone-soda cooking is:
(1) in the grass kind plant raw material, add steaming preparation, wherein alkali charge in NaOH to over dry material quantity 9-12%, liquor ratio is 1: 2-4, the anthraquinone addition is the 0.5-0.8% of over dry material quantity;
(2) feed steam and heat, insulation was 20-40 minute when heat temperature raising to temperature was 100-120 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute;
Described kraft cooking is:
(1) in the grass kind plant raw material, add steaming preparation, wherein alkali charge in NaOH to over dry material quantity 8-11%, liquor ratio is 1: 2-4, sulphidity are 5-15%;
(2) feed steam and heat, insulation was 20-40 minute when heat temperature raising to temperature was 110-140 ℃, carried out little steam bleeding, continued heat temperature raising to 165-173 ℃, was incubated 60-90 minute.
2. method according to claim 1 is characterized in that described grass kind plant raw material is one or more the combination in straw, wheat straw, cotton stalk, bagasse or the reed.
3. method according to claim 1 and 2 is characterized in that, when carrying out oxygen delignification, adds aqueous slkali in the slurry after discongesting, and wherein alkali charge is that the addition of oxygen is slurry 20-40kg per ton in the 2-4% of NaOH to the oven dry stock amount.
4. method according to claim 1; It is characterized in that described shove is said high-hardness pulp to be regulated concentration inlet from press master to the 8-15% get into, and under the effect of extruding force, carries out shove; After the extruding black liquor, concentration is that the slurry of 20-35% is discharged from the outlet of press master; Described press master is to extract reducing single-screw press master or the Var-nip press that black liquor is used in the prior art.
5. method according to claim 1 is characterized in that, described washing is to utilize the clear water of normal temperature or concentration in three sections vacuum pulp washing machines, to wash for cleaning solution for the black liquor of 3-6.2 ° of Be ' and pH8-8.3.
6. method according to claim 1 is characterized in that, described discongesting to the slurry after will washing utilizes fluffer to discongest makes fibre structure become loose.
7. method according to claim 6 is characterized in that, described fluffer is a kind of in mill fluffer or the defibrator in deflaker, kneading machine, dry pan, the beating equipment.
8. method according to claim 1 is characterized in that, described bleaching is handled and comprised chlorination, alkali treatment, post-bleach; Described chlorination is: at chlorine dosage is the 2.5-3% of oven dry stock, and the concentration of slurry is 3-3.5%, and temperature is to handle 45-60 minute under 50-55 ℃ the condition; Described alkali treatment is: alkali charge in NaOH to oven dry stock amount 2-4%, the concentration of slurry is 10-12%, temperature is to handle 100-150 minute under 50-55 ℃ the condition; Described post-bleach is: the addition at clorox is the 2-4% of oven dry stock amount, and temperature is to handle 100-150 minute under 30-35 ℃ the condition.
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| CN1044686A (en) * | 1989-01-30 | 1990-08-15 | 西北轻工业学院 | Join waste paper, awns stalk, wheat straw, straw manufacturing kraft liner board with mao bamboon (or mu bamboos, sundry bamboos) |
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| CN1074259A (en) * | 1992-12-24 | 1993-07-14 | 湖北省丹江口市第一造纸厂 | A kind of method of producingn rust-proof paper using Chinese alpine rush instead of wood pulp |
| CN1643209A (en) * | 2002-03-28 | 2005-07-20 | 阿克佐诺贝尔公司 | Process for bleaching lignocellulose-containing non-wood pulp |
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| CN101451312A (en) | 2009-06-10 |
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