CN105019286A - Device and method for making refined cottons through performing high-concentration hydrogen peroxide bleaching on cotton linters - Google Patents

Device and method for making refined cottons through performing high-concentration hydrogen peroxide bleaching on cotton linters Download PDF

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Publication number
CN105019286A
CN105019286A CN201510453418.2A CN201510453418A CN105019286A CN 105019286 A CN105019286 A CN 105019286A CN 201510453418 A CN201510453418 A CN 201510453418A CN 105019286 A CN105019286 A CN 105019286A
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China
Prior art keywords
cotton
cotton linter
activator
charging aperture
concentration
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CN201510453418.2A
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CN105019286B (en
Inventor
雷利荣
李友明
徐旗开
朱小林
黄运贤
肖仙英
黄放辉
侯轶
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KUYTUN XINDALU CHEMICAL CO Ltd
South China University of Technology SCUT
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KUYTUN XINDALU CHEMICAL CO Ltd
South China University of Technology SCUT
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/342—Mixing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)

Abstract

The invention discloses a device for making refined cottons through performing high-concentration hydrogen peroxide bleaching on cotton linters. The device comprises a bale opener, a metal detector, a cotton slitting machine, an impurity removal machine, a cyclone separator, a first spiral conveyor, a half stuff machine, a first medium-concentration stuff grinder where a defibering type grinding disc is installed, a second medium-concentration stuff grinder where a stuff-grinding type grinding disc is installed, a first double-net dehydrator, a crashing spiral conveyor, a double-rod mixer, a belt conveyor, a high-concentration mixer, a high-concentration bleaching tower, a second spiral conveyor and a second double-net dehydrator. The device is simple in structure and convenient to install and maintain. The invention further provides a method for making the refined cottons through performing high-concentration hydrogen peroxide bleaching on the cotton linters. By the utilization of the method, the quality of obtained products is high, impurities are few, the yield is high, the cost is low, and environment pollution is small.

Description

The high dense hydrogen peroxide bleaching of cotton linter prepares the device and method of purified cotton
Technical field
The invention belongs to pulp-making of cotton linter field, be specifically related to the device and method that the high dense hydrogen peroxide bleaching of a kind of cotton linter prepares purified cotton.
Background technology
Cotton linter is the part cotton fiber shorter than gined cotton, and peel from cottonseed surface the staple fibre come after referring to unginned cotton embroider, its length only has 10 ~ 50% of gined cotton usually, is mainly used in the aspects such as military project, chemical industry, papermaking and cellulose derivative.As a kind of raw material of papermaking fiber of high-quality, be mainly used in the production of paper for daily use, bank-note paper and special technique purposes paper.
The content of cellulose of cotton linter own is more than 90%, and non-cellulosic impurity is also few.But, in the process such as production, processing, transport, be mixed into a lot of external impurity, brought very large difficulty to slurrying.Therefore, the object of pulp-making of cotton linter is remove to be mixed into the external mechanicalness impurity such as the cotton seed hulls in cotton linter, cotton leaf, cotton stalk fragment, dust on the one hand, and remove pectin that cotton linter itself contains, wax, lipid, lignin, ash grade impurity, obtain purer cellulose.Meanwhile, destroyed the primary wall of cellulose cell by slurrying, improve chemical reactivity, and its degree of polymerization is dropped in required scope.
Traditional THE TECHNICS IN PULPMAKING OF COTTON LINTER, adopts cotton linter boiling under high temperature (150 ~ 175 DEG C), high pressure (0.4 ~ 0.8 MPa), high-alkali (12 ~ 18%) condition, and then carries out the techniques such as pulp washing, making beating, desanding, bleaching.This process, the most of impurity in cotton linter all in digestion process degraded remove, cause that chemical consumption is large, steam consumption be large, water resources consumption amount is large, and create the waste liquid of very high concentrations.In waste liquid, organic concentration is very high, and COD (COD) value can reach 30,000 ~ 100,000 mg/L, and colourity is very dark, and outward appearance is aterrimus, and residual alkali content is high, pollutes extremely serious.Meanwhile, under high temperature, condition of high voltage, cellulose decomposition is serious, and cause cotton fiber degree of polymerization degradation, pulping yield is lower.On the other hand, chlorine bleach technique generally taked by current cotton linter, and bleaching process creates highly toxic chlorine-containing organic compounds, causes serious harm to human health and ecological environment.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, provide the high dense hydrogen peroxide bleaching of a kind of green, efficiently cotton linter to prepare the device and method of purified cotton.
Object of the present invention is achieved through the following technical solutions:
The high dense hydrogen peroxide bleaching of cotton linter prepares the device of purified cotton, comprise bale opener, metal detector, opener, de-burring machine, cyclone separator, first conveying worm, breaker beater, first middle-density refiner of discongesting type mill is installed, second middle-density refiner of defibrination type mill is installed, first double wire decker, spiral smashing conveyor, two rod mixer, belt conveyor, high dense blender, high density hypo tower, second conveying worm, second double wire decker, wherein cotton linter is at described bale opener, connected by belt conveyor between metal detector and opener, at opener, connected by air delivery pipe between de-burring machine and cyclone separator, Cyclone outlet is connected with the charging aperture of the first conveying worm, the discharging opening of the first conveying worm is connected with breaker beater charging aperture,
Stock pump, screw press conveyer, middle underflow pump standpipe and middle underflow pump is disposed with between described breaker beater and the first middle-density refiner; Described stock pump charging aperture is connected with breaker beater discharging opening, and discharging opening is connected with screw press conveyer feed inlet; The charging aperture of described middle underflow pump standpipe is connected with screw press conveyer discharging opening, and its discharging opening is connected with middle underflow pump charging aperture; The first described middle concentrated jordaning machine inlet capable is connected with middle underflow pump discharging opening, and its grout outlet is connected with the second middle-density refiner stock inlet, and the second middle-density refiner grout outlet is connected with the charging aperture of the first double wire decker;
The charging aperture of described spiral smashing conveyor is connected with the discharging opening of the first double wire decker, and discharging opening is connected with the charging aperture of two rod mixer; The feed end of described belt conveyor is connected with the discharging opening of two rod mixer, and discharge end is connected with the charging aperture of the dense blender of height;
Described spiral smashing conveyor is provided with alkali lye and the first activator import, and is connected with alkali lye and the first activator measuring pump respectively, and described spiral smashing conveyor, two rod mixer are respectively arranged with steam inlet; The dense blender of described height is provided with H 2o 2with the second activator import, and respectively with H 2o 2be connected with the second activator measuring pump;
The charging aperture of described high density hypo tower is connected with the discharging opening of the dense blender of height, and discharging opening is connected with the charging aperture of the second conveying worm by the discharger of bottom; The discharging opening of the second described conveying worm is connected with the charging aperture of the second double wire decker.
Further, described belt conveyor is provided with jacket steam heater, and described jacket steam heater passes into the material of steam to conveying and heats.
Further, the mixing pan of High Rotation Speed is provided with in the dense blender of described height.
Adopt the high dense hydrogen peroxide bleaching of the cotton linter of described device to produce the method for purified cotton, comprise the following steps:
1) opener, removal of impurities, cotton linter is opened through bale opener and to be checked by metal detector after bag and to remove metal object, again by opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, remove portion impurity, is then transported to de-burring machine and removes the external impurity be mixed into such as dust, cotton seed hulls further simultaneously;
2) ooze in advance, washing and defibrination, through opener, the first conveying worm is entered after cotton linter after removal of impurities process mixes with alkali lye in cyclone separator, through the first conveying worm mixing, deliver into breaker beater, cotton linter is mixed, washing, discongest or cut off, and remove portion impurity, then send into screw press conveyer by stock pump to concentrate, become the more uniform material that concentration is 6 ~ 10%, then, concentration is that the material of 6 ~ 10% is by middle underflow pump standpipe, middle underflow pump conveying enters the first middle-density refiner successively, second middle-density refiner is discongested, defibrination, then the material through defibrination process enters the first double wire decker, extruding is concentrated becomes the material that concentration is 30 ~ 35%,
3) mix, heat, the material concentrated through the first double wire decker enters spiral smashing conveyor, fragmentation becomes loose little lumps, and adds alkali lye and the first activator respectively by measuring pump, then enters two rod mixer, in two rod mixer, material fully mixes with alkali lye, the first activator, meanwhile, in spiral smashing conveyor and two rod mixer, passes into steam respectively, heated slurry, to required temperature, enters belt conveyor through two mixed slurry of rod mixer;
4) mix, react, material enters the feed hopper of high dense blender through belt conveyor, then enters high dense blender, H 2o 2measured, delivered into high dense blender by measuring pump with the second activator respectively, with material fully, Homogeneous phase mixing, reaction;
5) bleach, material, H 2o 2, activator and alkali lye enters high density hypo tower after the dense blender mixing of height, carries out the bleaching of cotton linter;
6) pulp washing, material, after high density hypo tower fully reacts, enter the second conveying worm, and thin up becomes the slurry of 3 ~ 5% concentration by the discharger discharging bottom it, be transported to the concentration that the second double wire decker is concentrated into 30 ~ 35% again, become purified cotton slurry.
Further, in step 1), described cotton linter entrained external mechanicalness impurity content after opener, the process of removal of impurities workshop section is less than 4%.
Further, step 2) in, the alkali lye entering cyclone separator is NaOH solution, and concentration is 2 ~ 5%, and temperature is 40 ~ 80 DEG C.
Further, in step 3), in described spiral smashing conveyor and two rod mixer, pass into steam respectively, make the slurry temperature in two rod mixer exit reach 75 ~ 95 DEG C.
Further, in step 3), described spiral smashing conveyor adds alkali lye and the first activator respectively, and alkali lye addition is the 4 ~ 8%, first activator addition of cotton linter quality is by mass 0.1 ~ 0.5% of cotton linter quality by mass.
Further, in step 4), in the dense blender of height, add H respectively 2o 2with the second activator, H 2o 2addition is the 7 ~ 14%, second activator addition of cotton linter quality is by mass 0.1 ~ 0.5% of cotton linter quality by mass.
Further, in step 5), described material carries out bleaching action at ambient pressure in high density hypo tower, and the time of staying of material in high density hypo tower is 60 ~ 120 min, and temperature is 75 ~ 95 DEG C and holding temperature is stablized.
In addition, the waste water extruded through screw press conveyer and the first double wire decker after filtration, supplement after adding alkali lye capable of circulation for the oozing in advance of cotton linter, wash, recycle, energy-conserving and environment-protective.
The present invention has following advantage relative to prior art:
1, the present invention adopts and carries out dry method removal of impurities to cotton linter, raw material is first through the removal of impurities process of opener, de-burring machine, metal detector, again through alkali lye infiltration, wash, discongest, defibrination and concentrated, before bleaching, eliminate the various external mechanicalness impurity be mixed into contained in cotton linter more up hill and dale; Meanwhile, cotton linter obtains evenly, permeates fully, floods in the process, and the impurity such as part wax, lipid on cotton linter surface is dissolved out under the effect of alkali lye, greatly reduces the content of the cotton fiber impurity entering bleachery.
2, in middle concentrated jordaning process, by the discongesting of mill, defibrination effect, destroy the primary cell wall of fiber, and make fiber produce suitable cut-out and the effect of the fibrillating such as swollen, layering, be conducive to alkali lye, H 2o 2permeate evenly, fully in the fibre Deng medicine, improve the utilization rate of chemicals, improve the effect of bleaching.
3, the mixing pan of High Rotation Speed is designed with in the dense blender of height that the present invention adopts, to cotton linter and the alkali lye, the H that add 2o 2rapid mixing is carried out, the alkali lye, the H that make cotton linter He add Deng chemicals 2o 2, the chemicals such as activator obtains mixing fast, fully, equably.Meanwhile, under the dense condition of height, bleaching improves the concentration of reaction system herb liquid, greatly accelerates mass transfer rate, is conducive to the speed accelerating bleaching action process, improves the effect of bleaching.
4, bleaching process of the present invention carries out under normal pressure, cryogenic conditions, greatly reduces steam consumption, reduces production cost; Greatly reduce cellulosic degraded simultaneously, be conducive to the viscosity improving purified cotton product, improve pulping yield.
5, the present invention adopts activator to carry out activation processing to cotton fiber surface, effectively improves H 2o 2the effect of bleaching, decreases the consumption of chemicals simultaneously.
6, the present invention is because melting process purification efficiency is high, the impurity content entering the front material of bleaching is low, and pulping process carries out under middle and high concentration and normal pressure, cryogenic conditions, greatly reduce concentration and the generation of pulping waste liquor, effectively reduce the load of wastewater treatment, decrease the pollution to environment.
7, the present invention adopts the high dense hydrogen peroxide bleaching of cotton linter to prepare purified cotton, eliminates the generation of high toxicity organic chloride in pulp-making of cotton linter process, is conducive to human health and ecological environmental protection.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram that the high dense hydrogen peroxide bleaching of cotton linter of the embodiment of the present invention prepares purified cotton.
Fig. 2 is the process flow diagram that the high dense hydrogen peroxide bleaching of cotton linter of the embodiment of the present invention prepares the method for purified cotton.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is more specifically described, but the scope of protection of present invention is not limited to the scope that embodiment is stated.
embodiment one
As shown in Figure 1, the high dense hydrogen peroxide bleaching of cotton linter prepares the device of purified cotton, comprise bale opener, metal detector, opener, de-burring machine, cyclone separator, first conveying worm, breaker beater, first middle-density refiner of discongesting type mill is installed, second middle-density refiner of defibrination type mill is installed, first double wire decker, spiral smashing conveyor, two rod mixer, belt conveyor, high dense blender, high density hypo tower, second conveying worm, second double wire decker, wherein cotton linter is at described bale opener, connected by belt conveyor between metal detector and opener, at opener, connected by air delivery pipe between de-burring machine and cyclone separator, Cyclone outlet is connected with the charging aperture of the first conveying worm, the discharging opening of the first conveying worm is connected with breaker beater charging aperture,
Stock pump, screw press conveyer, middle underflow pump standpipe and middle underflow pump is disposed with between described breaker beater and the first middle-density refiner; Described stock pump charging aperture is connected with breaker beater discharging opening, and discharging opening is connected with screw press conveyer feed inlet; The charging aperture of described middle underflow pump standpipe is connected with screw press conveyer discharging opening, and its discharging opening is connected with middle underflow pump charging aperture; The first described middle concentrated jordaning machine inlet capable is connected with middle underflow pump discharging opening, and its grout outlet is connected with the second middle-density refiner stock inlet, and the second middle-density refiner grout outlet is connected with the charging aperture of the first double wire decker;
The charging aperture of described spiral smashing conveyor is connected with the discharging opening of the first double wire decker, and discharging opening is connected with the charging aperture of two rod mixer; The feed end of described belt conveyor is connected with the discharging opening of two rod mixer, and discharge end is connected with the charging aperture of the dense blender of height;
Described spiral smashing conveyor is provided with alkali lye and the first activator import, and is connected with alkali lye and the first activator measuring pump respectively, and described spiral smashing conveyor, two rod mixer are respectively arranged with steam inlet; The dense blender of described height is provided with H 2o 2with the second activator import, and respectively with H 2o 2be connected with the second activator measuring pump;
The charging aperture of described high density hypo tower is connected with the discharging opening of the dense blender of height, and discharging opening is connected with the charging aperture of the second conveying worm by the discharger of bottom; The discharging opening of the second described conveying worm is connected with the charging aperture of the second double wire decker.
In the present embodiment, described belt conveyor is provided with jacket steam heater, and described jacket steam heater passes into the material of steam to conveying and heats.
In the present embodiment, in the dense blender of described height, be provided with the mixing pan of High Rotation Speed, can realize cotton linter and the alkali lye, the H that add 2o 2rapid mixing is carried out, the alkali lye, the H that make cotton linter He add Deng chemicals 2o 2, the chemicals such as activator obtains fast, mixes fully, equably, meanwhile, under the dense condition of height, bleaching improves the concentration of reaction system herb liquid, greatly accelerates mass transfer rate, is conducive to the speed accelerating bleaching action process, improves the effect of bleaching.
embodiment two
As shown in Figure 2, the high dense hydrogen peroxide bleaching of cotton linter prepares the method for purified cotton, adopts III class cotton linter to be raw material, comprises the following steps:
1) opener, removal of impurities, cotton linter is opened through bale opener and to be checked by metal detector after bag and to remove metal object, again by opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, remove portion impurity, is then transported to de-burring machine and removes the external impurity be mixed into such as dust, cotton seed hulls further simultaneously; External mechanicalness impurity content after process entrained by cotton linter is less than 4%;
2) ooze in advance, washing and defibrination, through opener, cotton linter after removal of impurities process is 40 DEG C with temperature in cyclone separator, mass concentration is enter the first conveying worm after the NaOH solution mixing of 5%, through the first conveying worm mixing, deliver into breaker beater, cotton linter is mixed, washing, discongest or cut off, and remove portion impurity, then send into screw press conveyer by stock pump to concentrate, become the more uniform material that concentration is 8.3%, then, being concentrated into concentration is that the cotton linter of 8.3% is by middle underflow pump standpipe, middle underflow pump delivers into the first middle-density refiner of series connection successively, second middle-density refiner is discongested, defibrination, then the first double wire decker is entered, extruding is concentrated becomes the material that concentration is 33.7%,
3) mix, heat, the material concentrated through the first double wire decker enters spiral smashing conveyor, fragmentation becomes loose little lumps, and by measuring pump add respectively by mass for cotton linter quality 8% NaOH solution and be the first activator of cotton linter quality 0.3% by mass, then two rod mixer is entered, in two rod mixer, material fully mixes with NaOH solution, the first activator, simultaneously, steam is passed into respectively in spiral smashing conveyor and two rod mixer, heated slurry is to 90 DEG C, and then slurry enters belt conveyor;
4) mix, react, material enters the feed hopper of high dense blender through belt conveyor, then enters high dense blender, is the H of cotton linter quality 14% by mass simultaneously 2o 2measured, delivered into high dense blender by measuring pump with second activator of 0.3% respectively, with material fully, Homogeneous phase mixing, reaction;
5) bleach, material, H 2o 2, activator and alkali lye enters high density hypo tower after the dense blender mixing of height, carries out the bleaching of cotton linter; Material is 120 min in the time of staying of high density hypo tower, passes into steam and makes cotton fiber slurry temperature maintain 90 DEG C and keep stable;
6) pulp washing, material, after high density hypo tower fully reacts, enter the second conveying worm, and thin up becomes the slurry of 5% concentration by the discharger discharging bottom it, then is transported to the concentration that the second double wire decker is concentrated into 35%, becomes purified cotton slurry.
Through the purified cotton alpha-cellulose content 97.4%, whiteness 86%ISO that above process prepares, the waste water COD of generation is 12800 mg/L, BOD is 4400 mg/L.
embodiment three
As shown in Figure 2, the high dense hydrogen peroxide bleaching of cotton linter prepares the method for purified cotton, adopts III class cotton linter to be raw material, comprises the following steps:
1) opener, removal of impurities, cotton linter is opened through bale opener and to be checked by metal detector after bag and to remove metal object, again by opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, remove portion impurity, is then transported to de-burring machine and removes the external impurity be mixed into such as dust, cotton seed hulls further simultaneously; External mechanicalness impurity content after process entrained by cotton linter is less than 4%;
2) ooze in advance, washing and defibrination, through opener, cotton linter after removal of impurities process is 80 DEG C with temperature in cyclone separator, mass concentration is enter the first conveying worm after the NaOH solution mixing of 2%, through the first conveying worm mixing, deliver into breaker beater, cotton linter is mixed, washing, discongest or cut off, and remove portion impurity, then send into screw press conveyer by stock pump to concentrate, become the more uniform material that concentration is 6%, then, being concentrated into concentration is that the cotton linter of 6% is by middle underflow pump standpipe, middle underflow pump delivers into the first middle-density refiner of series connection successively, second middle-density refiner is discongested, defibrination, then the first double wire decker is entered, extruding is concentrated becomes the material that concentration is 30%,
3) mix, heat, the material concentrated through the first double wire decker enters spiral smashing conveyor, fragmentation becomes loose little lumps, and by measuring pump add respectively by mass for cotton linter quality 4% NaOH solution and be the first activator of cotton linter quality 0.5% by mass, then two rod mixer is entered, in two rod mixer, material fully mixes with NaOH solution, the first activator, simultaneously, steam is passed into respectively in spiral smashing conveyor and two rod mixer, heated slurry is to 75 DEG C, and then slurry enters belt conveyor;
4) mix, react, material enters the feed hopper of high dense blender through belt conveyor, then enters high dense blender, is the H of cotton linter quality 7% by mass simultaneously 2o 2measured, delivered into high dense blender by measuring pump with second activator of 0.5% respectively, with material fully, Homogeneous phase mixing, reaction;
5) bleach, material, H 2o 2, activator and alkali lye enters high density hypo tower after the dense blender mixing of height, carries out the bleaching of cotton linter; Material is 60 min in the time of staying of high density hypo tower, passes into steam and makes cotton fiber slurry temperature maintain 75 DEG C and keep stable.
6) pulp washing, material, after high density hypo tower fully reacts, enter the second conveying worm, and thin up becomes the slurry of 3% concentration by the discharger discharging bottom it, then is transported to the concentration that the second double wire decker is concentrated into 30%, becomes purified cotton slurry.
Through the purified cotton alpha-cellulose content 95.2%, whiteness 77%ISO that above process prepares, the waste water COD of generation is 8900 mg/L, BOD is 3500 mg/L.
embodiment four
As shown in Figure 2, the high dense hydrogen peroxide bleaching of cotton linter prepares the method for purified cotton, adopts III class cotton linter to be raw material, comprises the following steps:
1) opener, removal of impurities, cotton linter is opened through bale opener and to be checked by metal detector after bag and to remove metal object, again by opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, remove portion impurity, is then transported to de-burring machine and removes the external impurity be mixed into such as dust, cotton seed hulls further simultaneously; External mechanicalness impurity content after process entrained by cotton linter is less than 4%;
2) ooze in advance, washing and defibrination, through opener, cotton linter after removal of impurities process is 60 DEG C with temperature in cyclone separator, mass concentration is enter the first conveying worm after the NaOH solution mixing of 4%, through the first conveying worm mixing, deliver into breaker beater, cotton linter is mixed, washing, discongest or cut off, and remove portion impurity, then send into screw press conveyer by stock pump to concentrate, become the more uniform material that concentration is 10%, then, being concentrated into concentration is that the cotton linter of 10% is by middle underflow pump standpipe, middle underflow pump delivers into the first middle-density refiner of series connection successively, second middle-density refiner is discongested, defibrination, then the first double wire decker is entered, extruding is concentrated becomes the material that concentration is 35%,
3) mix, heat, the material concentrated through the first double wire decker enters spiral smashing conveyor, fragmentation becomes loose little lumps, and by measuring pump add respectively by mass for cotton linter quality 6% NaOH solution and be the first activator of cotton linter quality 0.1% by mass, then two rod mixer is entered, in two rod mixer, material fully mixes with NaOH solution, the first activator, simultaneously, steam is passed into respectively in spiral smashing conveyor and two rod mixer, heated slurry is to 95 DEG C, and then slurry enters belt conveyor;
4) mix, react, material enters the feed hopper of high dense blender through belt conveyor, then enters high dense blender, is the H of cotton linter quality 12% by mass simultaneously 2o 2measured, delivered into high dense blender by measuring pump with second activator of 0.1% respectively, with material fully, Homogeneous phase mixing, reaction;
5) bleach, material, H 2o 2, activator and alkali lye enters high density hypo tower after the dense blender mixing of height, carries out the bleaching of cotton linter; Material is 100 min in the time of staying of high density hypo tower, passes into steam and makes cotton fiber slurry temperature maintain 95 DEG C and keep stable.
6) pulp washing, material, after high density hypo tower fully reacts, enter the second conveying worm, and thin up becomes the slurry of 4.5% concentration by the discharger discharging bottom it, then is transported to the concentration that the second double wire decker is concentrated into 35%, becomes purified cotton slurry.
Through the alpha-cellulose content 96.7%, whiteness 84%ISO of the purified cotton that above process prepares, the waste water COD of generation is 11500 mg/L, BOD is 4300 mg/L.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.

Claims (10)

1. the high dense hydrogen peroxide bleaching of cotton linter prepares the device of purified cotton, it is characterized in that: comprise bale opener, metal detector, opener, de-burring machine, cyclone separator, first conveying worm, breaker beater, first middle-density refiner of discongesting type mill is installed, second middle-density refiner of defibrination type mill is installed, first double wire decker, spiral smashing conveyor, two rod mixer, belt conveyor, high dense blender, high density hypo tower, second conveying worm, second double wire decker, wherein cotton linter is at described bale opener, connected by belt conveyor between metal detector and opener, at opener, connected by air delivery pipe between de-burring machine and cyclone separator, Cyclone outlet is connected with the charging aperture of the first conveying worm, the discharging opening of the first conveying worm is connected with breaker beater charging aperture,
Stock pump, screw press conveyer, middle underflow pump standpipe and middle underflow pump is disposed with between described breaker beater and the first middle-density refiner; Described stock pump charging aperture is connected with breaker beater discharging opening, and discharging opening is connected with screw press conveyer feed inlet; The charging aperture of described middle underflow pump standpipe is connected with screw press conveyer discharging opening, and its discharging opening is connected with middle underflow pump charging aperture; The first described middle concentrated jordaning machine inlet capable is connected with middle underflow pump discharging opening, and its grout outlet is connected with the second middle-density refiner stock inlet, and the second middle-density refiner grout outlet is connected with the charging aperture of the first double wire decker;
The charging aperture of described spiral smashing conveyor is connected with the discharging opening of the first double wire decker, and discharging opening is connected with the charging aperture of two rod mixer; The feed end of described belt conveyor is connected with the discharging opening of two rod mixer, and discharge end is connected with the charging aperture of the dense blender of height;
Described spiral smashing conveyor is provided with alkali lye and the first activator import, and is connected with alkali lye and the first activator measuring pump respectively, and described spiral smashing conveyor, two rod mixer are respectively arranged with steam inlet; The dense blender of described height is provided with H 2o 2with the second activator import, and respectively with H 2o 2be connected with the second activator measuring pump;
The charging aperture of described high density hypo tower is connected with the discharging opening of the dense blender of height, and discharging opening is connected with the charging aperture of the second conveying worm by the discharger of bottom; The discharging opening of the second described conveying worm is connected with the charging aperture of the second double wire decker.
2. device according to claim 1, is characterized in that: described belt conveyor is provided with jacket steam heater, and described jacket steam heater passes into the material of steam to conveying and heats.
3. device according to claim 1, is characterized in that: the mixing pan being provided with High Rotation Speed in the dense blender of described height.
4. adopt the high dense hydrogen peroxide bleaching of the cotton linter of device described in claim 1 to any one of claim 3 to produce the method for purified cotton, it is characterized in that, comprise the following steps:
1) opener, removal of impurities, cotton linter is opened through bale opener and to be checked by metal detector after bag and to remove metal object, again by opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, remove portion impurity, is then transported to de-burring machine and removes the external impurity be mixed into such as dust, cotton seed hulls further simultaneously;
2) ooze in advance, washing and defibrination, through opener, the first conveying worm is entered after cotton linter after removal of impurities process mixes with alkali lye in cyclone separator, through the first conveying worm mixing, deliver into breaker beater, cotton linter is mixed, washing, discongest or cut off, and remove portion impurity, then send into screw press conveyer by stock pump to concentrate, become the more uniform material that concentration is 6 ~ 10%, then, concentration is that the material of 6 ~ 10% is by middle underflow pump standpipe, middle underflow pump conveying enters the first middle-density refiner successively, second middle-density refiner is discongested, defibrination, then the material through defibrination process enters the first double wire decker, extruding is concentrated becomes the material that concentration is 30 ~ 35%,
3) mix, heat, the material concentrated through the first double wire decker enters spiral smashing conveyor, fragmentation becomes loose little lumps, and adds alkali lye and the first activator respectively by measuring pump, then enters two rod mixer, in two rod mixer, material fully mixes with alkali lye, the first activator, meanwhile, in spiral smashing conveyor and two rod mixer, passes into steam respectively, heated slurry, to required temperature, enters belt conveyor through two mixed slurry of rod mixer;
4) mix, react, material enters the feed hopper of high dense blender through belt conveyor, then enters high dense blender, H 2o 2measured, delivered into high dense blender by measuring pump with the second activator respectively, with material fully, Homogeneous phase mixing, reaction;
5) bleach, material, H 2o 2, activator and alkali lye enters high density hypo tower after the dense blender mixing of height, carries out the bleaching of cotton linter;
6) pulp washing, material, after high density hypo tower fully reacts, enter the second conveying worm, and thin up becomes the slurry of 3 ~ 5% concentration by the discharger discharging bottom it, be transported to the concentration that the second double wire decker is concentrated into 30 ~ 35% again, become purified cotton slurry.
5. method according to claim 4, is characterized in that: in step 1), and described cotton linter entrained external mechanicalness impurity content after opener, the process of removal of impurities workshop section is less than 4%.
6. method according to claim 4, is characterized in that: step 2) in, the alkali lye entering cyclone separator is NaOH solution, and concentration is 2 ~ 5%, and temperature is 40 ~ 80 DEG C.
7. method according to claim 4, is characterized in that: in step 3), passes into steam respectively in described spiral smashing conveyor and two rod mixer, makes the slurry temperature in two rod mixer exit reach 75 ~ 95 DEG C.
8. method according to claim 4, it is characterized in that: in step 3), described spiral smashing conveyor adds alkali lye and the first activator respectively, and alkali lye addition is the 4 ~ 8%, first activator addition of cotton linter quality is by mass 0.1 ~ 0.5% of cotton linter quality by mass.
9. method according to claim 4, is characterized in that: in step 4), in the dense blender of height, add H respectively 2o 2with the second activator, H 2o 2addition is the 7 ~ 14%, second activator addition of cotton linter quality is by mass 0.1 ~ 0.5% of cotton linter quality by mass.
10. method according to claim 4, it is characterized in that: in step 5), described material carries out bleaching action at ambient pressure in high density hypo tower, and the time of staying of material in high density hypo tower is 60 ~ 120 min, and temperature is 75 ~ 95 DEG C and holding temperature is stablized.
CN201510453418.2A 2015-07-29 2015-07-29 Device and method for making refined cottons through performing high-concentration hydrogen peroxide bleaching on cotton linters Expired - Fee Related CN105019286B (en)

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