CN105019286B - 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
CN105019286B
CN105019286B CN201510453418.2A CN201510453418A CN105019286B CN 105019286 B CN105019286 B CN 105019286B CN 201510453418 A CN201510453418 A CN 201510453418A CN 105019286 B CN105019286 B CN 105019286B
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China
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cotton
cotton linter
activator
concentration
highly concentrated
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CN105019286A (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)
  • Detergent Compositions (AREA)
  • Paper (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-roller 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 highly concentrated 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 is and in particular to a kind of highly concentrated hydrogen peroxide bleaching of cotton linter prepares purified cotton Device and method.
Background technology
Cotton linter is the part cotton fiber shorter than gined cotton, the short fibre stripping down from Semen Gossypii surface after referring to unginned cotton embroider Dimension, its length generally only has the 10 ~ 50% of gined cotton, 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, is mainly used in the production of paper for daily use, bank-note paper and special technique purposes paper.
, more than 90%, non-cellulosic impurity is simultaneously few for cotton linter content of cellulose itself.But, producing, processing, transporting Deng during be mixed into a lot of external impurity, bring very big difficulty to slurrying.Therefore, purpose one side of pulp-making of cotton linter Face is to remove the external mechanicalness impurity such as the cotton seed hullss being mixed in cotton linter, cotton leaf, cotton stalk fragment, dust, and removes cotton Pectin that short flannel contains in itself, waxiness, lipid, lignin, ash grade impurity, obtain purer cellulose.Meanwhile, by slurrying Destroy the primary wall of cellulose cell, improve chemical reactivity, and so that its degree of polymerization is dropped in required scope.
Traditional THE TECHNICS IN PULPMAKING OF COTTON LINTER, using by cotton linter high temperature (150 ~ 175 DEG C), high pressure (0.4 ~ 0.8 mpa), Steaming and decocting under the conditions of high-alkali (12 ~ 18%), then carries out the techniques such as pulp washing, making beating, desanding, bleaching again.This process, cotton is short Most of impurity in floss is degraded removal all in digestion process, causes that chemical consumption is big, steam consumption is big, water money Source consumption is big, and creates the waste liquid of very high concentrations.In waste liquid, organic concentration is very high, and COD (cod) value is up to 3 Ten thousand ~ 100,000 mg/l, and colourity is very deep, outward appearance is in atrouss, and residual alkali content is high, and pollution is extremely serious.Meanwhile, in high temperature, high pressure Under the conditions of, cellulose decomposition is serious, causes cotton fiber degree of polymerization degradation, pulping yield is relatively low.On the other hand, current cotton is short Chlorine bleach technique generally taken by floss, and bleaching process creates highly toxic chlorine-containing organic compounds, to human health and ecology Environment causes serious harm.
Content of the invention
It is an object of the invention to overcoming the shortcoming of prior art, provide a kind of green, highly concentrated peroxide of efficient cotton linter Change the device and method of hydrogen bleaching preparation purified cotton.
The purpose of the present invention is achieved through the following technical solutions:
The highly concentrated hydrogen peroxide bleaching of cotton linter prepare purified cotton device, including bale opener, metal detector, opener, De-burring machine, cyclone separator, the first conveying worm, breaker beater, installation are discongested the first middle-density refiner of type mill, are installed mill Second middle-density refiner of slurry type mill, the first double wire decker, spiral smashing conveyor, double shaft mixer, belt conveyor, Highly concentrated blender, high density hypo tower, the second conveying worm, the second double wire decker, wherein cotton linter described bale opener, Connected by belt conveyor between metal detector and opener, pass through between opener, de-burring machine and cyclone separator Air delivery pipe connects, and Cyclone outlet is connected with the charging aperture of the first conveying worm, the discharging of the first conveying worm Mouth is connected with half stuff machine inlet；
It is disposed with stock pump, screw press conveyer, middle underflow between described breaker beater and the first middle-density refiner Pump standpipe and middle underflow pump；Described stock pump charging aperture is connected with breaker beater discharging opening, and discharging opening is fed with screw press conveyer Mouth connects；The described charging aperture of middle underflow pump standpipe is connected with screw press conveyer discharging opening, its discharging opening and middle underflow Pump charging aperture connects；The first described middle concentrated jordaning machine inlet is connected with middle underflow pump discharging opening, in its grout outlet and second Dense fiberizer stock inlet connects, 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, discharging opening and double roller The charging aperture of mixer connects；The feed end of described belt conveyor is connected with the discharging opening of double shaft mixer, discharge end with The charging aperture of highly concentrated blender connects；
Described spiral smashing conveyor is provided with alkali liquor and the first activator import, and activates with alkali liquor and first respectively Agent dosing pump connects, and described spiral smashing conveyor, double shaft mixer are respectively arranged with steam inlet；Described highly concentrated mixing Device is provided with h2o2With the second activator import, and respectively with h2o2Connect with the second activator dosing pump；
The charging aperture of described high density hypo tower is connected with the discharging opening of highly concentrated blender, the discharging by bottom for the discharging opening Device is connected with the charging aperture of the second conveying worm；The described discharging opening of the second conveying worm and the second double wire decker Charging aperture connects.
Further, described belt conveyor is provided with jacket steam heater, described jacket steam heater It is passed through steam the material of conveying is heated.
Further, it is provided with the mixing pan of high-speed rotation in described highly concentrated blender.
The method producing purified cotton using the highly concentrated hydrogen peroxide bleaching of the cotton linter of described device, comprises the following steps:
1) opener, remove impurity, cotton linter is opened through bale opener and is checked by metal detector after bag and remove metal object, then passes through Opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, simultaneously remove partial impurities, be then delivered to de-burring machine further Remove dust, the external impurity being mixed into of cotton seed hullss；
2) ooze in advance, wash and defibrination, after the cotton linter after processing through opener, remove impurity is mixed with alkali liquor in cyclone separator Enter the first conveying worm, mix, deliver into breaker beater through the first conveying worm, cotton linter carried out mix, wash, Discongest or cut off, and remove partial impurities, then by stock pump send into screw press conveyer concentrated, become concentration be 6 ~ 10% more uniform material, then, the material for 6 ~ 10% for the concentration passes through middle underflow pump standpipe, middle underflow pump conveying sequentially enters First middle-density refiner, the second middle-density refiner carry out discongesting, defibrination, and then to enter first pair of net de- for the material through defibrination process Water dispenser, extruding concentration becomes the material that concentration is 30 ~ 35%；
3) mixing, heating, enters spiral smashing conveyor through the material that the first double wire decker concentrates, is broken into loose Little lumps, and alkali liquor and the first activator are separately added into by dosing pump, subsequently into double shaft mixer, in double shaft mixer In, material and alkali liquor, the first activator are sufficiently mixed uniformly, meanwhile, in spiral smashing conveyor and double shaft mixer respectively It is passed through steam, heating slurry to required temperature, enter belt conveyor through the mixed slurry of double shaft mixer；
4) mixing, reaction, material enters the feed hopper of highly concentrated blender through belt conveyor, subsequently into highly concentrated mixing Device, h2o2With the second activator respectively by measuring pump-metered, delivering into highly concentrated blender, fully, uniformly mix with material, instead Should；
5) bleach, material, h2o2, activator and alkali liquor enter high density hypo tower after mixing through highly concentrated blender, carry out cotton short The bleaching of floss；
6) pulp washing, material, after high density hypo tower fully reacts, enters the second spiral transferring by the discharger discharging of its bottom Send machine, and dilute becomes the slurry of 3 ~ 5% concentration, then be transported to the concentration that the second double wire decker is concentrated into 30 ~ 35%, become For purified cotton slurry.
Further, in step 1), the entrained external mechanicalness after processing through opener, remove impurity workshop section of described cotton linter Impurity content is less than 4%.
Further, step 2) in, enter cyclone separator alkali liquor be naoh solution, concentration be 2 ~ 5%, temperature be 40 ~ 80℃.
Further, in step 3), each lead into steam in described spiral smashing conveyor and double shaft mixer, make double roller The slurry temperature in mixer exit reaches 75 ~ 95 DEG C.
Further, in step 3), described spiral smashing conveyor is separately added into alkali liquor and the first activator, and alkali liquor adds Amount is the 4 ~ 8% of cotton linter quality by mass, and the first activator addition is the 0.1 ~ 0.5% of cotton linter quality by mass.
Further, in step 4), in highly concentrated blender, it is separately added into h2o2With the second activator, h2o2Addition It is the 7 ~ 14% of cotton linter quality by mass, the second activator addition is the 0.1 ~ 0.5% of cotton linter quality by mass.
Further, in step 5), described material carries out bleaching action, material in high density hypo tower at ambient pressure The time of staying in high density hypo tower is 60 ~ 120 min, and temperature is 75 ~ 95 DEG C and maintains temperature stabilization.
In addition, the waste water through screw press conveyer and the first double wire decker extrusion adds after alkali liquor through filtering, supplementing It is circularly used for the pre- of cotton linter ooze, wash, recycle, energy-conserving and environment-protective.
The present invention has the advantage that with respect to prior art
1st, the present invention carries out dry method remove impurity using to cotton linter, and raw material first passes around opener, de-burring machine, metal detector Remove impurity process, then the infiltration through alkali liquor, wash, discongest, defibrination and concentration, more thoroughly eliminate cotton linter before bleaching In the contained various external mechanicalness impurity being mixed into；Meanwhile, cotton linter obtains uniform, sufficient infiltration, leaching in the process Stain, the impurity such as the part waxiness on cotton linter surface, lipid is dissolved out in the presence of alkali liquor, greatly reduces entrance bleaching work The content of the cotton fiber impurity of section.
2nd, during middle concentrated jordaning, 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 liquor, h2o2Equal in the fibre Deng medicine Even, sufficient infiltration, improves the utilization rate of chemical drugss, improves the effect of bleaching.
3rd, it is designed with the mixing pan of high-speed rotation, the alkali to cotton linter and addition in the highly concentrated blender that the present invention adopts Liquid, h2o2Quickly mixed Deng chemical drugss, made cotton linter and the alkali liquor adding, h2o2, the chemical drugss such as activator obtain soon Speed, sufficiently and uniformly mix.Meanwhile, under the conditions of highly concentrated, bleaching improves the concentration of reaction system herb liquid, greatly accelerates Mass transfer rate, is conducive to accelerating the speed of bleaching action process, improves the effect of bleaching.
4th, the bleaching process of the present invention is carried out under normal pressure, cryogenic conditions, greatly reduces steam consumption, reduces life Produce cost；Greatly reduce the degraded to cellulose simultaneously, be conducive to improving the viscosity of purified cotton product, improve pulping yield.
5th, the present invention carries out activation processing using activator to cotton fiber surface, effectively increases h2o2The effect of bleaching, with When decrease the consumption of chemical drugss.
6th, because melting process purification efficiency is high, the impurity content entering material before bleaching is low for the present invention, and pulping process exists Carry out under middle and high concentration and normal pressure, cryogenic conditions, greatly reduce concentration and the yield of pulping waste liquor, effectively reduce useless The load of water process, decreases the pollution to environment.
7th, the present invention adopts the highly concentrated hydrogen peroxide bleaching of cotton linter to prepare purified cotton, eliminates height during pulp-making of cotton linter The generation of toxic organic chlorides, is conducive to human health and ecological environmental protection.
Brief description
Fig. 1 is the apparatus structure schematic diagram of the cotton linter highly concentrated hydrogen peroxide bleaching preparation purified cotton of the embodiment of the present invention.
Fig. 2 is that the technological process of the method for cotton linter highly concentrated hydrogen peroxide bleaching preparation purified cotton of the embodiment of the present invention is shown It is intended to.
Specific embodiment
With reference to embodiment, the present invention is more specifically described, but the scope of protection of present invention not office It is limited to the scope that embodiment is stated.
Embodiment one
As shown in figure 1, the highly concentrated hydrogen peroxide bleaching of cotton linter prepares the device of purified cotton, including bale opener, metal detection Device, opener, de-burring machine, cyclone separator, the first conveying worm, breaker beater, installation discongest type mill first in dense mill Pulp grinder, install the second middle-density refiner of defibrination type mill, the first double wire decker, spiral smashing conveyor, double shaft mixer, Belt conveyor, highly concentrated blender, high density hypo tower, the second conveying worm, the second double wire decker, wherein cotton linter is in institute Connected by belt conveyor between bale opener, metal detector and the opener stated, in opener, de-burring machine and cyclonic separation Connected by air delivery pipe between device, Cyclone outlet is connected with the charging aperture of the first conveying worm, the first spiral transferring The discharging opening sending machine is connected with half stuff machine inlet；
It is disposed with stock pump, screw press conveyer, middle underflow between described breaker beater and the first middle-density refiner Pump standpipe and middle underflow pump；Described stock pump charging aperture is connected with breaker beater discharging opening, and discharging opening is fed with screw press conveyer Mouth connects；The described charging aperture of middle underflow pump standpipe is connected with screw press conveyer discharging opening, its discharging opening and middle underflow Pump charging aperture connects；The first described middle concentrated jordaning machine inlet is connected with middle underflow pump discharging opening, in its grout outlet and second Dense fiberizer stock inlet connects, 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, discharging opening and double roller The charging aperture of mixer connects；The feed end of described belt conveyor is connected with the discharging opening of double shaft mixer, discharge end with The charging aperture of highly concentrated blender connects；
Described spiral smashing conveyor is provided with alkali liquor and the first activator import, and activates with alkali liquor and first respectively Agent dosing pump connects, and described spiral smashing conveyor, double shaft mixer are respectively arranged with steam inlet；Described highly concentrated mixing Device is provided with h2o2With the second activator import, and respectively with h2o2Connect with the second activator dosing pump；
The charging aperture of described high density hypo tower is connected with the discharging opening of highly concentrated blender, the discharging by bottom for the discharging opening Device is connected with the charging aperture of the second conveying worm；The described discharging opening of the second conveying worm and the second double wire decker Charging aperture connects.
In the present embodiment, described belt conveyor is provided with jacket steam heater, described jacket steam heating dress Put be passed through steam to conveying material heat.
In the present embodiment, it is provided with the mixing pan of high-speed rotation in described highly concentrated blender, can achieve to cotton linter and add The alkali liquor that enters, h2o2Quickly mixed Deng chemical drugss, made cotton linter and the alkali liquor adding, h2o2, the chemical drugss such as activator Obtain quick, sufficiently and uniformly mix, meanwhile, bleaching under the conditions of highly concentrated improves the concentration of reaction system herb liquid, significantly Accelerate mass transfer rate, be conducive to accelerating the speed of bleaching action process, improve the effect of bleaching.
Embodiment two
As shown in Fig. 2 the method that the highly concentrated hydrogen peroxide bleaching of cotton linter prepares purified cotton, it is former using class cotton linter Material, comprises the following steps:
1) opener, remove impurity, cotton linter is opened through bale opener and is checked by metal detector after bag and remove metal object, then passes through Opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, simultaneously remove partial impurities, be then delivered to de-burring machine further Remove the external impurity being mixed into such as dust, cotton seed hullss；External mechanicalness impurity content entrained by cotton linter after process is less than 4%；
2) ooze in advance, wash and defibrination, through opener, remove impurity process after cotton linter in cyclone separator with temperature be 40 DEG C, mass concentration be 5% naoh solution mixing after enter the first conveying worm, through first conveying worm mix, convey into Enter breaker beater, cotton linter is carried out mixing, wash, discongest or cutting off, and removes partial impurities, then spiral pressure is sent into by stock pump Squeeze conveyer to be concentrated, become the more uniform material that concentration is 8.3%, then, be concentrated into the cotton linter that concentration is 8.3% and lead to Cross that middle underflow pump standpipe, middle underflow pump deliver into the first middle-density refiner of series connection successively, the second middle-density refiner is dredged Solution, defibrination, subsequently into the first double wire decker, extruding concentrates becomes the material that concentration is 33.7%；
3) mixing, heating, enters spiral smashing conveyor through the material that the first double wire decker concentrates, is broken into loose Little lumps, and by dosing pump be separately added into by mass be cotton linter quality 8% naoh solution and by mass for cotton short First activator of floss quality 0.3%, subsequently into double shaft mixer, in double shaft mixer, material and naoh solution, first Activator is sufficiently mixed uniformly, meanwhile, each leads into steam in spiral smashing conveyor and double shaft mixer, heating slurry arrives 90 DEG C, then slurry entrance belt conveyor；
4) mixing, reaction, material enters the feed hopper of highly concentrated blender through belt conveyor, subsequently into highly concentrated mixing Device, is the h of cotton linter quality 14% simultaneously by mass2o2With 0.3% the second activator respectively by metering pump-metered, convey into Enter highly concentrated blender, fully, uniformly mix with material, react；
5) bleach, material, h2o2, activator and alkali liquor enter high density hypo tower after mixing through highly concentrated blender, carry out cotton short The bleaching of floss；Material is 120 min in the time of staying of high density hypo tower, and being passed through steam makes cotton fiber slurry temperature maintain At 90 DEG C and keep stable；
6) pulp washing, material, after high density hypo tower fully reacts, enters the second spiral transferring by the discharger discharging of its bottom Send machine, and dilute becomes the slurry of 5% concentration, then be transported to the concentration that the second double wire decker is concentrated into 35%, become essence Cotton pulp material processed.
The purified cotton alpha-cellulose content 97.4% preparing through process above method, whiteness 86%iso, the waste water of generation Cod is 12800 mg/l, and bod is 4400 mg/l.
Embodiment three
As shown in Fig. 2 the method that the highly concentrated hydrogen peroxide bleaching of cotton linter prepares purified cotton, it is former using class cotton linter Material, comprises the following steps:
1) opener, remove impurity, cotton linter is opened through bale opener and is checked by metal detector after bag and remove metal object, then passes through Opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, simultaneously remove partial impurities, be then delivered to de-burring machine further Remove the external impurity being mixed into such as dust, cotton seed hullss；External mechanicalness impurity content entrained by cotton linter after process is less than 4%；
2) ooze in advance, wash and defibrination, through opener, remove impurity process after cotton linter in cyclone separator with temperature be 80 DEG C, mass concentration be 2% naoh solution mixing after enter the first conveying worm, through first conveying worm mix, convey into Enter breaker beater, cotton linter is carried out mixing, wash, discongest or cutting off, and removes partial impurities, then spiral pressure is sent into by stock pump Squeeze conveyer to be concentrated, become the more uniform material that concentration is 6%, then, be concentrated into during the cotton linter that concentration is 6% passes through Underflow pump standpipe, middle underflow pump deliver into the first middle-density refiner of series connection successively, the second middle-density refiner carries out discongesting, grinds Slurry, subsequently into the first double wire decker, extruding concentrates becomes the material that concentration is 30%；
3) mixing, heating, enters spiral smashing conveyor through the material that the first double wire decker concentrates, is broken into loose Little lumps, and by dosing pump be separately added into by mass be cotton linter quality 4% naoh solution and by mass for cotton short First activator of floss quality 0.5%, subsequently into double shaft mixer, in double shaft mixer, material and naoh solution, first Activator is sufficiently mixed uniformly, meanwhile, each leads into steam in spiral smashing conveyor and double shaft mixer, heating slurry arrives 75 DEG C, then slurry entrance belt conveyor；
4) mixing, reaction, material enters the feed hopper of highly concentrated blender through belt conveyor, subsequently into highly concentrated mixing Device, is the h of cotton linter quality 7% simultaneously by mass2o2With 0.5% the second activator respectively by metering pump-metered, deliver into Highly concentrated blender, fully, is uniformly mixed with material, reacts；
5) bleach, material, h2o2, activator and alkali liquor enter high density hypo tower after mixing through highly concentrated blender, carry out cotton short The bleaching of floss；Material is 60 min in the time of staying of high density hypo tower, and being passed through steam makes cotton fiber slurry temperature maintain At 75 DEG C and keep stable.
6) pulp washing, material, after high density hypo tower fully reacts, enters the second spiral transferring by the discharger discharging of its bottom Send machine, and dilute becomes the slurry of 3% concentration, then be transported to the concentration that the second double wire decker is concentrated into 30%, become essence Cotton pulp material processed.
The purified cotton alpha-cellulose content 95.2% preparing through process above method, whiteness 77%iso, the waste water of generation Cod is 8900 mg/l, and bod is 3500 mg/l.
Example IV
As shown in Fig. 2 the method that the highly concentrated hydrogen peroxide bleaching of cotton linter prepares purified cotton, it is former using class cotton linter Material, comprises the following steps:
1) opener, remove impurity, cotton linter is opened through bale opener and is checked by metal detector after bag and remove metal object, then passes through Opener by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, simultaneously remove partial impurities, be then delivered to de-burring machine further Remove the external impurity being mixed into such as dust, cotton seed hullss；External mechanicalness impurity content entrained by cotton linter after process is less than 4%；
2) ooze in advance, wash and defibrination, through opener, remove impurity process after cotton linter in cyclone separator with temperature be 60 DEG C, mass concentration be 4% naoh solution mixing after enter the first conveying worm, through first conveying worm mix, convey into Enter breaker beater, cotton linter is carried out mixing, wash, discongest or cutting off, and removes partial impurities, then spiral pressure is sent into by stock pump Squeeze conveyer to be concentrated, become the more uniform material that concentration is 10%, then, be concentrated into the cotton linter that concentration is 10% and pass through Middle underflow pump standpipe, middle underflow pump deliver into the first middle-density refiner of series connection successively, the second middle-density refiner carries out discongesting, Defibrination, subsequently into the first double wire decker, extruding concentrates becomes the material that concentration is 35%；
3) mixing, heating, enters spiral smashing conveyor through the material that the first double wire decker concentrates, is broken into loose Little lumps, and by dosing pump be separately added into by mass be cotton linter quality 6% naoh solution and by mass for cotton short First activator of floss quality 0.1%, subsequently into double shaft mixer, in double shaft mixer, material and naoh solution, first Activator is sufficiently mixed uniformly, meanwhile, each leads into steam in spiral smashing conveyor and double shaft mixer, heating slurry arrives 95 DEG C, then slurry entrance belt conveyor；
4) mixing, reaction, material enters the feed hopper of highly concentrated blender through belt conveyor, subsequently into highly concentrated mixing Device, is the h of cotton linter quality 12% simultaneously by mass2o2With 0.1% the second activator respectively by metering pump-metered, convey into Enter highly concentrated blender, fully, uniformly mix with material, react；
5) bleach, material, h2o2, activator and alkali liquor enter high density hypo tower after mixing through highly concentrated blender, carry out cotton short The bleaching of floss；Material is 100 min in the time of staying of high density hypo tower, and being passed through steam makes cotton fiber slurry temperature maintain At 95 DEG C and keep stable.
6) pulp washing, material, after high density hypo tower fully reacts, enters the second spiral transferring by the discharger discharging of its bottom Send machine, and dilute becomes the slurry of 4.5% concentration, then be transported to the concentration that the second double wire decker is concentrated into 35%, become Purified cotton slurry.
The alpha-cellulose content 96.7% of the purified cotton preparing through process above method, whiteness 84%iso, generation useless Water cod is 11500 mg/l, and bod is 4300 mg/l.
The above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not to the present invention Embodiment restriction.For those of ordinary skill in the field, can also make on the basis of the above description The change of other multi-forms or variation.There is no need to be exhaustive to all of embodiment.All the present invention's Any modification, equivalent and improvement made within spirit and principle etc., should be included in the protection of the claims in the present invention Within the scope of.

Claims (8)

1. the highly concentrated hydrogen peroxide bleaching of cotton linter prepare purified cotton device it is characterised in that: include bale opener, metal detection Device, opener, de-burring machine, cyclone separator, the first conveying worm, breaker beater, installation discongest type mill first in dense mill Pulp grinder, install the second middle-density refiner of defibrination type mill, the first double wire decker, spiral smashing conveyor, double shaft mixer, Belt conveyor, highly concentrated blender, high density hypo tower, the second conveying worm, the second double wire decker, wherein cotton linter is in institute Connected by belt conveyor between bale opener, metal detector and the opener stated, in opener, de-burring machine and cyclonic separation Connected by air delivery pipe between device, Cyclone outlet is connected with the charging aperture of the first conveying worm, the first spiral transferring The discharging opening sending machine is connected with half stuff machine inlet；
Be disposed between described breaker beater and the first middle-density refiner stock pump, screw press conveyer, middle underflow pump stand Pipe and middle underflow pump；Described stock pump charging aperture is connected with breaker beater discharging opening, and discharging opening is with screw press conveyer feed inlet even Connect；The described charging aperture of middle underflow pump standpipe is connected with screw press conveyer discharging opening, and its discharging opening and middle underflow pump enter Material mouth connects；The first described middle concentrated jordaning machine inlet is connected with middle underflow pump discharging opening, dense mill in its grout outlet and second Pulp grinder stock inlet connects, 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 mixed with double roller The charging aperture of machine connects；The feed end of described belt conveyor is connected with the discharging opening of double shaft mixer, discharge end with highly concentrated The charging aperture of blender connects；
Described spiral smashing conveyor is provided with alkali liquor and the first activator import, and respectively with alkali liquor and the first activator meter Amount pump connects, and described spiral smashing conveyor, double shaft mixer are respectively arranged with steam inlet；Described highly concentrated blender sets It is equipped with h2o2With the second activator import, and respectively with h2o2Connect with the second activator dosing pump；
The charging aperture of described high density hypo tower is connected with the discharging opening of highly concentrated blender, discharging opening by the discharger of bottom with The charging aperture of the second conveying worm connects；The described discharging opening of the second conveying worm and the charging of the second double wire decker Mouth connects；
Described belt conveyor is provided with jacket steam heater, and described jacket steam heater is passed through steam to conveying Material heated；
It is provided with the mixing pan of high-speed rotation in described highly concentrated blender.
2. adopt the method that the highly concentrated hydrogen peroxide bleaching of cotton linter of claim 1 described device produces purified cotton, its feature exists In comprising the following steps:
1) opener, remove impurity, cotton linter is opened through bale opener and is checked by metal detector after bag and remove metal object, then passes through opener Machine by cotton linter shredding, be shredded into cotton-shaped fine grained chippings, simultaneously remove partial impurities, be then delivered to de-burring machine and remove further The external impurity being mixed into of dust, cotton seed hullss；
2) ooze in advance, wash and defibrination, the cotton linter after processing through opener, remove impurity is entered after being mixed with alkali liquor in cyclone separator First conveying worm, mixes, delivers into breaker beater through the first conveying worm, cotton linter is carried out mixing, washs, discongest Or cut-out, and remove partial impurities, then screw press conveyer is sent into by stock pump and concentrated, becoming concentration is 6 ~ 10% More uniform material, then, the material for 6 ~ 10% for the concentration passes through middle underflow pump standpipe, middle underflow pump conveying sequentially enters first Middle-density refiner, the second middle-density refiner carry out discongesting, defibrination, and then the material through defibrination process enters the first dual-network dehydration Machine, extruding concentration becomes the material that concentration is 30 ~ 35%；
3) mixing, heating, enters spiral smashing conveyor through the material that the first double wire decker concentrates, and is broken into loose little Lumps, and alkali liquor and the first activator are separately added into by dosing pump, subsequently into double shaft mixer, in double shaft mixer, Material and alkali liquor, the first activator are sufficiently mixed uniformly, each lead in spiral smashing conveyor and double shaft mixer meanwhile Steam, heating slurry to required temperature, enter belt conveyor through the mixed slurry of double shaft mixer；
4) mixing, reaction, material enters the feed hopper of highly concentrated blender through belt conveyor, subsequently into highly concentrated blender, h2o2 With the second activator respectively by measuring pump-metered, delivering into highly concentrated blender, fully, uniformly mix with material, react；
5) bleach, material, h2o2, activator and alkali liquor enter high density hypo tower after mixing through highly concentrated blender, carry out cotton linter Bleaching；
6) pulp washing, material, after high density hypo tower fully reacts, enters the second conveying worm by the discharger discharging of its bottom, And dilute becomes the slurry of 3 ~ 5% concentration, then it is transported to the concentration that the second double wire decker is concentrated into 30 ~ 35%, become essence Cotton pulp material processed.
3. method according to claim 2 it is characterised in that: in step 1), described cotton linter is through opener, remove impurity workshop section After process, entrained external mechanicalness impurity content is less than 4%.
4. method according to claim 2 it is characterised in that: step 2) in, enter cyclone separator alkali liquor be naoh Solution, concentration is 2 ~ 5%, and temperature is 40 ~ 80 DEG C.
5. method according to claim 2 it is characterised in that: in step 3), described spiral smashing conveyor and double roller are mixed Each lead into steam in conjunction machine, make the slurry temperature in double shaft mixer exit reach 75 ~ 95 DEG C.
6. method according to claim 2 it is characterised in that: in step 3), described spiral smashing conveyor is separately added into Alkali liquor and the first activator, alkali liquor addition is the 4 ~ 8% of cotton linter quality by mass, and the first activator addition presses quality It is calculated as the 0.1 ~ 0.5% of cotton linter quality.
7. method according to claim 2 it is characterised in that: in step 4), in highly concentrated blender, be separately added into h2o2 With the second activator, h2o2Addition is the 7 ~ 14% of cotton linter quality by mass, and the second activator addition is by mass The 0.1 ~ 0.5% of cotton linter quality.
8. method according to claim 2 it is characterised in that: in step 5), described material is in high density hypo tower Carry out bleaching action at ambient pressure, the time of staying in high density hypo tower for the material is 60 ~ 120 min, temperature is for 75 ~ 95 DEG C simultaneously Maintain temperature stabilization.
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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CN107287958B (en) * 2016-04-08 2019-06-28 奎屯新大陆化学有限公司 A kind of equipment of cotton linter bleaching preparation purified cotton
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