CN102561093B - Continuous cotton pulp washing and bleaching process - Google Patents
Continuous cotton pulp washing and bleaching process Download PDFInfo
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- CN102561093B CN102561093B CN201110447653.0A CN201110447653A CN102561093B CN 102561093 B CN102561093 B CN 102561093B CN 201110447653 A CN201110447653 A CN 201110447653A CN 102561093 B CN102561093 B CN 102561093B
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Abstract
The invention belongs to the cotton pulp field and particularly provides a water-saving continuous cotton pulp washing and bleaching process, wherein a redesigned drum-type vacuum washer is used to replace the frequently-used horizontal belt washer for cotton pulp dreg bleaching. A countercurrent washing method is used for washing the cotton pulp, not only is water saved, but also the washing effect is good, the labor intensity is reduced, the control accuracy is improved, continuous production is achieved, and the product quality is stable.
Description
Technical field
The present invention relates to the detergent bleach flow process of dissolving pulp manufacturing, particularly a kind of continuous washing bleaching process of cotton pulp.
Background technology
Cotton Pulp claims again refining cotton pulp, is to take cotton linter as raw material, through alkaline cooking, the refining a kind of high purity cellulose forming of rinsing.Mainly for the manufacture of cellulose acetate, nitrocellulose and ethers cellulose, be widely used in the fields such as food, medicine, toothpaste, daily use chemicals, building materials, papermaking, electronics, plastics, space flight and military project.
Current Cotton Pulp production is generally divided into boiling, washing, several operations of bleaching, manufacture paper with pulp.In washing procedure, at present the capital equipment of application is belt pulp washing machine or even slot type wash engine, not only water consumption large, cannot realize that remote auto is controlled but also clean result is poor, appropriation of labour power.Bleaching process is mainly used slot type bleaching machine, and bleaching energy consumption is high, efficiency is low, and owing to can not realizing continuous bleaching, causes the pulp quality difference of different batches.Aspect papermaking, the washing facility of application comparative maturity is mainly vacuum pulp washing machine, but the black liquor different in kind due to dissolving pulp and paper making pulps, and two kinds of slurry kind of drainabilities differ greatly, conventional wash engine be applied to there will be in the process of cotton pulp washing be difficult to online, cannot produce vacuum, easy slurry, cause normally using, also make associated continuous rinsing process be difficult to developed.
Summary of the invention
The present invention is directed to the many weak points that exist in existing Cotton Pulp detergent bleach process, a kind of saving washing water continuous bleaching technique is provided, conventional Horizontal belt pulp dresser while wherein mainly having adopted the drum vacuum pulp washer redesigning to replace present Cotton Pulp bleaching, adopt the mode of countercurrent washing to wash cotton pulp, not only water saving but also clean result are good, reduce labor intensity, and improve control accuracy, produce continuously constant product quality.
The present invention has mainly adopted drum vacuum pulp washer to replace Horizontal belt pulp dresser, adopts the mode of countercurrent washing in the prerequisite that guarantees washing quality, to be issued to the object of water saving.It is faster that inventor finds that cotton pulp and common paper making pulps are compared drainage rate, so inventor has carried out redesign, sizing concentration adjusted, in the hope of reaching best effect simultaneously for water leg of wash engine etc.
Concrete technical scheme of the present invention is:
Cotton pulp is carried out to preliminary treatment, described preliminary treatment is for entering the cotton pulp after boiling in buffering slurry tower, after consistencyregulator, be pumped to high concentration desanding device and carry out preliminary desanding, slurry after desanding is pulled an oar through steep-taper jordan, beating degree is 28～32 ° of SR, is so more conducive to follow-up washing and bleaching;
Afterwards slurry further being adjusted to concentration is after 0.5～2wt%, to enter the washing of at least 4 vacuum pulp washing machine series connection units, stock tank in the middle of slurry after cleaning enters, after adjustment concentration 0.5～1.5wt%, enter low dense desander and further purify, the vacuum pulp washing machine that the slurry after purification enters independent setting again further washs and concentrates; The washings that now produce can be directly used in the adjustment that enters slurry concentration before low dense desander by closing pipe line, with saving water resource.Wherein in process, key equipment vacuum pulp washing machine water leg changes to 350-450mm by original internal diameter 250mm, filtrate runner tilts from the horizontal, by transmission side, to non-drive side, tilted gradually, angle of inclination be 1～5 ° and transmission side runner shallow, non-drive side runner is dark, gradually transition.
Why design like this, main cause is as follows:
Wash engine involved in the present invention is to design according to the character of black liquor, wherein machine concentration on wash engine is reduced to 0.5～1.5wt% by 1.5 original～2.5wt%, why like this design be mainly due to, the handled slurry of existing wash engine is generally wood pulp or straw pulp, the height of its online concentration requirement, generally at 1.5～2.5wt%, the black liquor amount of ton slurry is few like this, and the designing requirement of water leg is to allow black liquor be full of, and must guarantee that the filtrate producing can flow away in time, could produce vacuum like this, therefore in prior art, must guarantee that machine concentration reaches 1.5～2.5wt%, but based on cotton pulp and straw pulp, the difference of wood pulp, cotton pulp is in production practices now, because cotton pulp drainability is very good, if the concentration according to prior art regulation is entered slurry, slurry one enters wash engine drainage fast, at the moment drainage that enters stock tank, be just enough to make high cannot the surfing the Net of concentration of cotton pulp, cause stock tank slurry, and then affect the work of whole wash engine, so inventor is through long term production, to enter to starch concentration adjustment reduces, make it to be reduced to the wherein best 1wt% of employing of 0.5～1.5wt%, after adopting this design, black liquor amount is large nearly one times, and although original water leg can be full of, but black liquor cannot be discharged in time, will cause like this black liquor in wash engine, to be detained in a large number, destroy vacuum, be difficult to reach the object of pulp washing, this sizing concentration can not be excessive, otherwise after the quick drainage of cotton pulp, black liquor cannot be full of water leg as mentioned above, cannot produce vacuum equally, and if this sizing concentration is too small, can strengthen the output of black liquor, improve whole production cost.
And in order to coordinate the adjustment of this sizing concentration, inventor has also carried out the internal diameter of wash engine water leg to adjust makes it to be increased to 350-450mm, make it can adapt to the increase of black liquor amount.The rotary drum of same wash engine the inside, be furnished with runner above, above runner, be covered with net, slurry is held back and is formed slurry layer by net like this, filtrate is flowed out wash engine by runner, runner is originally all level, be parallel to rotary drum, water leg is in non-drive side, the Length Ratio of rotary drum is larger, the black liquor of transmission side flows to non-drive side from transmission side like this, flow to again water leg, during long production continuously of whole stroke, black liquor is difficult to discharge timely, when especially black liquor amount is large, can go out runner and run the slurry layer above bad runner, cause producing and cannot normally carry out, the present inventor makes runner to tilt into, form drop, be conducive to accelerate the outflow of black liquor, wherein main design is exactly that runner is tilted to non-drive side gradually by transmission side, and transmission side runner is shallow, non-drive side runner is dark, thereby guarantee carrying out smoothly of whole pulp washing process, particularly for cotton pulp, because its drainability is higher than straw pulp, black liquor flow velocity is fast, inventor especially angle of inclination is set as 1～5 ° and transmission side runner shallow, non-drive side runner is dark, transition gradually, adopt the outflow that can better be beneficial to black liquor after this design.
In order to reach better pulp washing effect, the water leg internal diameter described in the present invention preferably adopts 400mm.
In sum, rotary-drum vacuum wash engine of the present invention, the filtrate runner of described washer drum is tilted to non-drive side gradually by transmission side, and transmission side runner is shallow, and non-drive side runner is dark; Described wash engine water leg 3 internal diameters are 350～450mm.
Wherein said runner angle of inclination is 1～5 °; Described wash engine water leg internal diameter preferably adopts 400mm.
Cotton pulp through above-mentioned processing, can enter the bleaching process of lower step, of the present invention is tri-sections of continuous bleaching modes of floating of CEH, the medicament adopting is prior art, but in above-mentioned continuous bleaching process, still used the vacuum pulp washing machine after the present invention improves to carry out washing dehydration, concrete processing step is:
Cotton pulp after concentrated enters chlorination tower after starching chlorine blender, cotton pulp after chlorination is adjusted after dense 1～2wt% through vacuum pulp washing machine washing dehydration, after adjusting alkali to heat, enter alkalization tower, after completing, alkali treatment is delivered to vacuum pulp washing machine washing dehydration after the dense 1～2wt% of tune, after adding bleaching liquor to mix to heat, be delivered to bleaching tower, after adjusting dense 1～2wt%, be delivered to vacuum pulp washing machine washing dehydration, after acid adjustment, enter acid accumulator treatment tower, after acid treatment completes, adjust to be delivered to vacuum pulp washing machine washing dehydration after dense 1～2wt% and to be delivered to pulp storage tower, deliver to the workshop of the manufacturing paper with pulp finished product pulpboard of manufacturing paper with pulp.
In prior art, in tri-sections of continuous bleaching modes of floating of CEH, can not adopt wash engine to process, main cause is exactly the pulp washing that original wash engine is not suitable for cotton pulp, also just cannot be applied in the continuous bleaching technique that tri-sections of CEH float, tower directly enters to alkalize after the chlorination of existing cotton pulp industry, do not wash, after alkali treatment, directly enter Bellmer, do not wash yet, after having bleached, directly at Bellmer, wash, and above-mentioned process is step, cannot adapt to the requirement that serialization is produced, and the present invention adopts the wash engine after above-mentioned improvement to carry out after tri-sections of continuous bleachings that float of CEH, realized serialization production, and every step is washed all recycles in this step of filtrate that produce after processing, greatly reduce industrial water amount, reduced cost, and realized the recycle of processing Chinese medicine,
Equally, because cotton pulp drainability is very good, inventor is all controlled at 1～2wt% left and right optimal selection 1.2-1.5wt% by the sizing concentration of cotton pulp in the slurry of above steps, to avoid occurring the problems such as vacuum reduction.
The vacuum pulp washing machine that wherein adopted, the rotary-drum vacuum wash engine adopting with upper step is identical, and in order to adapt to the requirement of bleaching process, in this step of inventor, the internal diameter of wash engine is set to 300～450mm.
In the present invention, except specified otherwise, other techniques, treatment agent and equipment all adopt prior art.
In sum, the present invention has adopted drum vacuum pulp washer to replace Horizontal belt pulp dresser, adopts the mode of countercurrent washing simultaneously, can realize the continuous production of cotton pulp washing, bleaching, easily realize remote centralized and automatically control, save labour cost, and the product quality of producing is high and stable.Compared with prior art, current existing cotton pulp industry, what extract the general use of workshop section is belt pulp washing machine, 12～15 cubic metres of ton slurry waters, and ton slurry generation black liquor is more than 10 cubes, wash rear residual alkali more than 0.5g/L, and adopt after the present invention's improved technique of institute and the series connection of drum vacuum pulp washer 4-5 platform, ton slurry water is 8 cubes of left and right only, and ton slurry produces black liquor and also only has 6～7 cubes, wash rear residual alkali in 0.2～0.3g/L left and right, visible technique of the present invention is applicable to the requirement that serialization environmental protection is produced more.
Accompanying drawing explanation
Fig. 1 is drum vacuum pulp washer structural representation of the present invention;
Fig. 2 is the structural representation of drum vacuum pulp washer rotary drum of the present invention;
Fig. 3 is the schematic diagram of drum vacuum pulp washer rotary drum upper runner of the present invention;
In figure, 1 is rotary drum, and 2 is runner, and 3 is water leg, and A is non-drive side, and B is transmission side.
The specific embodiment
Below in conjunction with embodiment, further illustrate the present invention, can make those skilled in the art more fully understand the present invention, but not limit the present invention in any way.
Embodiment 1
Cotton pulp after boiling is entered to buffering slurry tower, after consistencyregulator, be pumped to high concentration desanding device and carry out preliminary desanding, slurry after desanding is pulled an oar through steep-taper jordan, beating degree is 28～32 ° of SR, further adjusting afterwards concentration is after 0.5wt%, to enter continuously the washing of 4 vacuum pulp washing machine series connection units, stock tank in the middle of slurry after cleaning enters, after adjustment concentration 0.5wt%, enter low dense desander and further purify, the vacuum pulp washing machine that the slurry after purification enters independent setting again further washs and concentrates; The washings that now produce can be directly used in the adjustment that enters slurry concentration before low dense desander by closing pipe line, realize the recycle of water resource.Key equipment rotary-drum vacuum wash engine in process wherein, its primary structure is as follows: the filtrate runner 2 of described washer drum 1 is tilted to non-drive side A gradually by transmission side B, and transmission side B runner is shallow, and non-drive side A runner is dark; Described wash engine water leg 3 internal diameters are 400mm; Wherein said runner angle of inclination is 1～5 °.
Cotton pulp through above-mentioned processing, enter the bleaching process of lower step, of the present invention is tri-sections of continuous bleaching modes of floating of CEH, the medicament adopting is prior art, but in above-mentioned continuous bleaching process, still used the rotary-drum vacuum wash engine after above-mentioned improvement to carry out washing dehydration, concrete processing step is:
Cotton pulp after concentrated enters chlorination tower after starching chlorine blender, cotton pulp after chlorination is adjusted after dense 1wt% through vacuum pulp washing machine washing dehydration, after adjusting alkali to heat, enter alkalization tower, after completing, alkali treatment is delivered to vacuum pulp washing machine washing dehydration after the dense 1wt% of tune, after adding bleaching liquor to mix to heat, be delivered to bleaching tower, after adjusting dense 1wt%, be delivered to vacuum pulp washing machine washing dehydration, after acid adjustment, enter acid accumulator treatment tower, after acid treatment completes, adjust to be delivered to vacuum pulp washing machine washing dehydration after dense 1wt% and to be delivered to pulp storage tower, deliver to the workshop of the manufacturing paper with pulp finished product pulpboard of manufacturing paper with pulp.
Embodiment 2
Cotton pulp after boiling is entered to buffering slurry tower, after consistencyregulator, be pumped to high concentration desanding device and carry out preliminary desanding, slurry after desanding is pulled an oar through steep-taper jordan, beating degree is 28～30 ° of SR, further adjusting afterwards concentration is after 1.5wt%, to enter continuously the washing of 5 vacuum pulp washing machine series connection units, stock tank in the middle of slurry after cleaning enters, after adjustment concentration 1wt%, enter low dense desander and further purify, the vacuum pulp washing machine that the slurry after purification enters independent setting again further washs and concentrates; The washings that now produce can be directly used in the adjustment that enters slurry concentration before low dense desander by closing pipe line, realize the recycle of water resource.Key equipment rotary-drum vacuum wash engine in process wherein, its primary structure is as follows: the filtrate runner 2 of described washer drum 1 is tilted to non-drive side A gradually by transmission side B, and transmission side B runner is shallow, and non-drive side A runner is dark; Described wash engine water leg 3 internal diameters are 450mm; Wherein said runner angle of inclination is 1～5 °.
Cotton pulp through above-mentioned processing, enter the bleaching process of lower step, of the present invention is tri-sections of continuous bleaching modes of floating of CEH, the medicament adopting is prior art, but in above-mentioned continuous bleaching process, still used the rotary-drum vacuum wash engine after above-mentioned improvement to carry out washing dehydration, concrete processing step is:
Cotton pulp after concentrated enters chlorination tower after starching chlorine blender, cotton pulp after chlorination is adjusted after dense 1.2wt% through vacuum pulp washing machine washing dehydration, after adjusting alkali to heat, enter alkalization tower, after completing, alkali treatment is delivered to vacuum pulp washing machine washing dehydration after the dense 1.2wt% of tune, after adding bleaching liquor to mix to heat, be delivered to bleaching tower, after adjusting dense 1.2wt%, be delivered to vacuum pulp washing machine washing dehydration, after acid adjustment, enter acid accumulator treatment tower, after acid treatment completes, adjust to be delivered to vacuum pulp washing machine washing dehydration after dense 1.2wt% and to be delivered to pulp storage tower, deliver to the workshop of the manufacturing paper with pulp finished product pulpboard of manufacturing paper with pulp.
Embodiment 3
Cotton pulp after boiling is entered to buffering slurry tower, after consistencyregulator, be pumped to high concentration desanding device and carry out preliminary desanding, slurry after desanding is pulled an oar through steep-taper jordan, beating degree is 30～32 ° of SR, further adjusting afterwards concentration is after 2wt%, to enter continuously the washing of 4 vacuum pulp washing machine series connection units, stock tank in the middle of slurry after cleaning enters, after adjustment concentration 1.5wt%, enter low dense desander and further purify, the vacuum pulp washing machine that the slurry after purification enters independent setting again further washs and concentrates; The washings that now produce can be directly used in the adjustment that enters slurry concentration before low dense desander by closing pipe line, realize the recycle of water resource.Key equipment rotary-drum vacuum wash engine in process wherein, its primary structure is as follows: the filtrate runner 2 of described washer drum 1 is tilted to non-drive side A gradually by transmission side B, and transmission side B runner is shallow, and non-drive side A runner is dark; Described wash engine water leg 3 internal diameters are 350mm; Wherein said runner angle of inclination is 1～5 °.
Cotton pulp through above-mentioned processing, enter the bleaching process of lower step, of the present invention is tri-sections of continuous bleaching modes of floating of CEH, the medicament adopting is prior art, but in above-mentioned continuous bleaching process, still used the rotary-drum vacuum wash engine after above-mentioned improvement to carry out washing dehydration, concrete processing step is:
Cotton pulp after concentrated enters chlorination tower after starching chlorine blender, cotton pulp after chlorination is adjusted after dense 1.5wt% through vacuum pulp washing machine washing dehydration, after adjusting alkali to heat, enter alkalization tower, after completing, alkali treatment is delivered to vacuum pulp washing machine washing dehydration after the dense 1.5wt% of tune, after adding bleaching liquor to mix to heat, be delivered to bleaching tower, after adjusting dense 1.5wt%, be delivered to vacuum pulp washing machine washing dehydration, after acid adjustment, enter acid accumulator treatment tower, after acid treatment completes, adjust to be delivered to vacuum pulp washing machine washing dehydration after dense 1.5wt% and to be delivered to pulp storage tower, deliver to the workshop of the manufacturing paper with pulp finished product pulpboard of manufacturing paper with pulp.
Embodiment 4
Cotton pulp after boiling is entered to buffering slurry tower, after consistencyregulator, be pumped to high concentration desanding device and carry out preliminary desanding, slurry after desanding is pulled an oar through steep-taper jordan, beating degree is 28～32 ° of SR, further adjusting afterwards concentration is after 2wt%, to enter continuously the washing of 4 vacuum pulp washing machine series connection units, stock tank in the middle of slurry after cleaning enters, after adjustment concentration 1.2wt%, enter low dense desander and further purify, the slurry after purification again enters vacuum pulp washing machine and further washs and concentrate; The washings that now produce can be directly used in the adjustment that enters slurry concentration before low dense desander by closing pipe line, realize the recycle of water resource.Key equipment rotary-drum vacuum wash engine in process wherein, its primary structure is as follows: the filtrate runner 2 of described washer drum 1 is tilted to non-drive side A gradually by transmission side B, and transmission side B runner is shallow, and non-drive side A runner is dark; Described wash engine water leg 3 internal diameters are 400mm; Wherein said runner angle of inclination is 1～5 °.
Cotton pulp through above-mentioned processing, enter the bleaching process of lower step, of the present invention is tri-sections of continuous bleaching modes of floating of CEH, the medicament adopting is prior art, but in above-mentioned continuous bleaching process, still used the rotary-drum vacuum wash engine after above-mentioned improvement to carry out washing dehydration, concrete processing step is:
Cotton pulp after concentrated enters chlorination tower after starching chlorine blender, cotton pulp after chlorination is adjusted after dense 2wt% through vacuum pulp washing machine washing dehydration, after adjusting alkali to heat, enter alkalization tower, after completing, alkali treatment is delivered to vacuum pulp washing machine washing dehydration after the dense 2wt% of tune, after adding bleaching liquor to mix to heat, be delivered to bleaching tower, after adjusting dense 2wt%, be delivered to vacuum pulp washing machine washing dehydration, after acid adjustment, enter acid accumulator treatment tower, after acid treatment completes, adjust to be delivered to vacuum pulp washing machine washing dehydration after dense 2wt% and to be delivered to pulp storage tower, deliver to the workshop of the manufacturing paper with pulp finished product pulpboard of manufacturing paper with pulp.
Through production practices, for same batch of cotton pulp slurry, as adopt current cotton pulp industry to extract the general belt pulp washing machine using of workshop section, ton is starched 12～15 cubic metres of waters, ton slurry produces black liquor more than 10 cubes, the bleaching stage is washed rear residual alkali more than 0.5g/L, and applies technique of the present invention, particularly technique as described in embodiment 1-4, with drum vacuum pulp washer 5-6 platform, connect, ton slurry 8 cubes of left and right of water, ton slurry produces 6～7 cubes of black liquor, washes rear residual alkali in 0.2～0.3g/L left and right.Visible technique of the present invention is applicable to the requirement that serialization environmental protection is produced more.
Claims (2)
- Cotton pulp wash continuously a bleaching process, comprise the preliminary treatment of cotton pulp, it is characterized in that: concrete steps are as follows:It is to enter the washing of at least 4 rotary-drum vacuum wash engines series connection units after 0.5～2wt% that pretreated cotton pulp slurry is further adjusted to concentration, stock tank in the middle of slurry after cleaning enters, after adjustment concentration 0.5～1.5wt%, enter low dense desander and further purify, the vacuum pulp washing machine that the slurry after purification enters independent setting again further washs and concentrates;Cotton pulp through above-mentioned processing, enters bleaching process, and the bleaching process adopting is the continuous bleaching mode that tri-sections of CEH float, and concrete processing step is:Cotton pulp after concentrated enters chlorination tower after starching chlorine blender, cotton pulp after chlorination is adjusted after dense 1～2wt% through vacuum pulp washing machine washing dehydration, after adjusting alkali to heat, enter alkalization tower, after completing, alkali treatment is delivered to vacuum pulp washing machine washing dehydration after the dense 1～2wt% of tune, after adding bleaching liquor to mix to heat, be delivered to bleaching tower, after adjusting dense 1～2wt%, be delivered to vacuum pulp washing machine washing dehydration, after acid adjustment, enter acid accumulator treatment tower, after acid treatment completes, adjust to be delivered to vacuum pulp washing machine washing dehydration after dense 1～2wt% and to be delivered to pulp storage tower, deliver to the workshop of the manufacturing paper with pulp finished product pulpboard of manufacturing paper with pulp;Wherein said rotary-drum vacuum wash engine: the filtrate runner (2) of described washer drum (1) is tilted to non-drive side A gradually by transmission side B, and transmission side B runner is shallow, and non-drive side A runner is dark; Described wash engine water leg (3) internal diameter is 350～450mm; Wherein said runner angle of inclination is 1～5 °;Described preliminary treatment is for entering the cotton pulp after boiling in buffering slurry tower, and after consistencyregulator, being pumped to high concentration desanding device carries out preliminary desanding, and the slurry after desanding enters the making beating of steep-taper jordan, and beating degree is 28～32 ° of SR.
- 2. technique according to claim 1, is characterized in that: described rotary-drum vacuum wash engine water leg internal diameter is 400mm.
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| CN201110447653.0A CN102561093B (en) | 2011-12-28 | 2011-12-28 | Continuous cotton pulp washing and bleaching process |
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| CN201110447653.0A CN102561093B (en) | 2011-12-28 | 2011-12-28 | Continuous cotton pulp washing and bleaching process |
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| CN115125750B (en) * | 2022-04-15 | 2023-07-07 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp for TFT-grade triacetate fiber and production method thereof |
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| CN2061478U (en) * | 1989-12-25 | 1990-09-05 | 化学工业部上海化工研究院 | Continuous filtering plate thickener |
| CN1485494A (en) * | 2002-09-24 | 2004-03-31 | 中国科学院广州化学研究所 | Auxiliary dehydrating plant for vacuum wash hollander |
| CN1718920A (en) * | 2004-07-23 | 2006-01-11 | 山东泉林纸业有限责任公司 | Bleaching method of cotton stalk chemical pulp |
| CN202688757U (en) * | 2011-12-28 | 2013-01-23 | 山东海韵生态纸业有限公司 | Rotary drum vacuum pulp washer |
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- 2011-12-28 CN CN201110447653.0A patent/CN102561093B/en active Active
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| CN2061478U (en) * | 1989-12-25 | 1990-09-05 | 化学工业部上海化工研究院 | Continuous filtering plate thickener |
| CN1485494A (en) * | 2002-09-24 | 2004-03-31 | 中国科学院广州化学研究所 | Auxiliary dehydrating plant for vacuum wash hollander |
| CN1718920A (en) * | 2004-07-23 | 2006-01-11 | 山东泉林纸业有限责任公司 | Bleaching method of cotton stalk chemical pulp |
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