CN101597871A - Integrated paper pulping bleaching and process for purifying waste water - Google Patents
Integrated paper pulping bleaching and process for purifying waste water Download PDFInfo
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Abstract
Integrated paper pulping bleaching and process for purifying waste water comprise paper pulping bleaching process section and two process sections of process for purifying waste water section; The paper pulping bleaching process section comprises: 1) section; 2) dosing; 3) enzyme-added and medicament initial action; 4) adding medicine deep reaction; 5) the precipitation defibrination that sieves; 6) the pulp washing bleach stable obtains finished product paper pulp; The process for purifying waste water section comprises: 1) purify precipitate and separate; 2) concentrate drying reclaims sediment.The present invention adopts chemistry and biology to combine, pulping bleaching technology is integrated finishing in same non-pressure vessel, need not the chlorine element in the pulping bleaching process, do not produce black liquor, to reduce COD in the pulping water, BOD, SS and colourity to greatest extent, pulp-making waste-water can be used for pulp washing and recycles after purified treatment, finally make whole pulping process waste water reach zero-emission or qualified discharge.
Description
Technical field
The present invention relates to a kind of paper-making pulping process, be specifically related to a kind of integrated paper pulping bleaching and process for purifying waste water.
Background technology
The industrial pollution caused by paper manufacturing problem, a great problem has become international.For solving this difficult problem, domestic and international many experts and scholars are for many years in research of actively being correlated with and discussion.The improvement of industrial pollution caused by paper manufacturing problem all is to be set out by the end treatment thoughtcast at present, the improvement pulping sewage that moves heaven and earth, but the mode of this end treatment has many difficult problems, and the effect of administering is also undesirable.Present situation is: if want the effect of administering good slightly, need sewage disposal device very complicated and that price is very expensive, treatment cost is very high; Another kind is less investment, but is difficult to reach the improvement requirement, makes paper industry be in very embarrassed position.
Summary of the invention
The object of the present invention is to provide a kind of integrated paper pulping bleaching and process for purifying waste water, it adopts chemistry and biology to combine, pulping bleaching technology is integrated finishing in same non-pressure vessel, need not the chlorine element in the pulping bleaching process, do not produce black liquor, to reduce COD in the pulping water, BOD, SS and colourity to greatest extent, pulp-making waste-water can be used for pulp washing and recycles after purified treatment, finally make whole pulping process waste water reach zero-emission or qualified discharge.
Technical solution of the present invention is:
A kind of integrated paper pulping bleaching and process for purifying waste water, its special character are that this processing step comprises two process sections, is respectively paper pulping bleaching process section and process for purifying waste water section;
Described paper pulping bleaching process section comprises the steps:
1) earlier ready pulping raw material is cut into 3～4cm fragment or silk is standby;
2) more standby according to the liquid material than calculating the required water yield, again it is added in the stirring pool and begins and heat;
3) normal pressure when heating-up temperature reaches 40 ℃, adds biology enzyme and pulping bleaching medicament down in stirring pool, adds above-mentioned pulping raw material in the stirring pool again and begins and stir;
4) continue heating, normal pressure adds the pulping bleaching medicament down again when temperature is raised to 75 ℃, be that 40 ℃～97 ℃ of internal controls make the temperature curve of whole process in temperature range, reacts and closes stirring in 55～60 minutes;
5) paper pulp raw material that will react then sieves the screening of sieving through 60 purposes, and the pulp-making waste-water after filtering is put into effluent settling chamber, and the raw material that screening is good is sent into high dense mill fiberizer and carried out defibrination 3～5 minutes;
6) will grind good slurry with stock pump then and be extracted into and add washing slurry in the kitchen sink, waste wash liquor will be put into effluent settling chamber, and at last washed slurry be put into reserve pit, and add bleaching stibilizer reaction 5 minutes, and leave standstill and to obtain finished product paper pulp;
Described process for purifying waste water section comprises the steps:
1) to the effluent settling chamber of depositing pulp-making waste-water and waste wash liquor, add the special efficacy water purification agent and carry out purified treatment, rapid precipitation, separation, clear water can be used for pulp washing and recycles or discharge;
2) reclaim sediment, obtain the solid shape organic matter of white after concentrated and dried, the solid shape organic matter of this white can directly be done the construction material use.
Above-mentioned liquid material is 5～8 than the oven dry weight part ratio by its raw material: 1.
Above-mentioned biology enzyme is the mixture that papain, lignin peroxidase, lignoenzyme, hydrogen peroxide generate enzyme and coenzyme catalyzing enzyme any one or they, and its consumption is 0.001～20umol/L.
The above-mentioned pulping bleaching medicament that adds when temperature is 40 ℃ is NaOH, Na
2SO
3, absolute ethyl alcohol, dodecane fundamental mode bleeding agent, anthraquinone or their mixture, its consumption is based on 0.05～1.2% of dry pulp weight.
The above-mentioned pulping bleaching medicament that adds when temperature is 75 ℃ is GaCO
3, Na
2SiO
3, MgSO
4, EDTA, sodium polyphosphate, sulfamic acid, permonosulphuric acid or their mixture, its consumption is based on 0.07～1.5% of dry pulp oven dry weight.
Above-mentioned pulping bleaching stabilizing agent is Na
2O
2Or H
2O
2Or their mixture, its consumption is based on 0.02～1.1% of dry pulp amount.
Above-mentioned pulp density is 5～10%, and the pH value of pulp slurry is 9～11, and speed of agitator is 25～80 rev/mins, and the rotating speed during described defibrination is 50～150 rev/mins.
Above-mentioned special efficacy water purification agent is that inorganic water purification agent of macromolecule and organic flocculants generate composite water purifying agent by the method that connects fat; Described composite water purifying agent is that two or more polymer of PAFS, poly aluminium iron silicate, polyacrylamide, shitosan connects the fat reaction and generates complexing agent, and its consumption is 1.5～5.5% of a waste water gross weight.
Above-mentioned raw materials comprises non-wood fibrous raw material, and described non-wood fibrous raw material comprises wheat straw, straw, Chinese alpine rush, bagasse, cotton bar, reed, reed reed, giantreed, hybrid giant napier and other non-wood-fibers.
The solid shape organic matter of above-mentioned white is lignin calcium and lignin sodium mixture.
The invention has the advantages that:
1, slurrying combines synchronous reaction with bleaching technology, and pulping bleaching technology is integrated to be finished.
2, yield of bleached pulp is up to 55%-68%, but owing to kept part papermaking lignin in the slurry, the papermaking pulp yield significantly rises, and paper pulp yield can reach more than 55%.
3, production process is short, traditional slurrying is combined once with bleaching process finish, and has shortened operation, and whole pulping bleaching process is no more than 1 hour, shortens 2/3 than traditional handicraft (3-5h).
4, environmental protection, pulping process do not have chlorine element, no black liquor, and pulp-making waste-water COD after purified treatment descends significantly, and purifying waste water can be recycled, and whole process of production does not produce carrion foul odour, the protection environment.
5, production cost descends, paper pulping bleaching is reflected in the non-pressure vessel and carries out, the pulping bleaching consersion unit only is the 30-40% of traditional process equipment cost, reaction temperature is less than 97 ℃, reaction time shortens 2/3 than traditional handicraft (3-5h), paper pulp wash water amount reduces, and integrated cost descends 30% than traditional handicraft.
The specific embodiment
Embodiment 1, and a kind of integrated paper pulping bleaching and process for purifying waste water, this processing step comprise paper pulping bleaching process section and process for purifying waste water section;
The paper pulping bleaching process section comprises the steps:
1) earlier will ready 1000 kilograms of wheat straws or straw be cut into 3～4cm fragment or thread standby;
2) according to the liquid material than 5: 1 proportional meter calculate the required water yield be 5000 kilograms standby, add the water of this tittle in the stirring pool again and begin heating;
3) under the normal pressure, when heating-up temperature reaches 40 ℃, in stirring pool, add papain, the amount that adds is 0.001umol/L, add pulping bleaching medicament NaOH, its consumption be based on 0.05% of dry pulp weight, again will above-mentioned standby wheat straw or straw to add stirring pool interior and begin stirring;
4) continue heating, normal pressure adds pulping bleaching medicament GaCO down again when temperature is raised to 75 ℃
3, its consumption is based on 0.07% of dry pulp weight, is that 40 ℃～97 ℃ of internal controls make the temperature curve of whole process in temperature range, reacts and closes stirring in 55～60 minutes;
5) the resulting paper pulp of wheat straw that will react then or straw sieves the screening of sieving through 60 purposes, and the pulp-making waste-water after filtering is put into effluent settling chamber, and the raw material that screening is good is sent into high dense mill fiberizer and carried out defibrination 3～5 minutes;
6) will grind good slurry with stock pump then is extracted into kitchen sink and adds washing slurry, waste wash liquor is put into effluent settling chamber, at last washed slurry is put into reserve pit and added common paper pulp fluorescent whitening agent R reaction 5 minutes, leave standstill the finished product paper pulp that can obtain more than at least 550 kilograms;
The process for purifying waste water section comprises the steps:
1) to the effluent settling chamber of depositing pulp-making waste-water and waste wash liquor, the complexing agent that adds PAFS, polyacrylamide carries out purified treatment, and its consumption is 1.5% of a waste water gross weight, rapid precipitation, separation, and clear water can be used for pulp washing and recycles or discharge;
2) reclaim sediment, through concentrate and dried after obtain the solid shape organic matter of white, i.e. lignin calcium and lignin sodium mixture, this white shape organic matter admittedly can directly be done the construction material use.
Embodiment 2, and a kind of integrated paper pulping bleaching and process for purifying waste water, this processing step comprise paper pulping bleaching process section and process for purifying waste water section;
The paper pulping bleaching process section comprises the steps:
1) earlier will ready 1000 kilograms of wheat straws or the bagasse raw material be cut into 3～4cm fragment or thread standby;
2) according to the liquid material than 6: 1 proportional meter calculate the required water yield be 6000 kilograms standby, add the water of this tittle in the stirring pool again and begin heating;
3) normal pressure is down when heating-up temperature reaches 40 ℃, in stirring pool, add the lignin peroxidase, the amount that adds is 0.03umol/L, add pulping bleaching medicament NaOH, dodecane fundamental mode bleeding agent, its consumption is based on 0.09% of dry pulp weight, more above-mentioned standby wheat straw or bagasse is added in the stirring pool and is begun to stir;
4) continue heating, normal pressure adds pulping bleaching medicament GaCO down again when temperature is raised to 75 ℃
3, Na
2SiO
2, its consumption is based on 0.1% of dry pulp weight, is that 40 ℃～97 ℃ of internal controls make the temperature curve of whole process in temperature range, reacts and closes stirring in 55～60 minutes;
5) the resulting paper pulp of wheat straw that will react then and bagasse sieves the screening of sieving through 60 purposes, and the pulp-making waste-water after filtering is put into effluent settling chamber, and the raw material that screening is good is sent into high dense mill fiberizer and carried out defibrination 3～5 minutes;
6) will grind good slurry with stock pump then and be extracted into kitchen sink and add washing slurry, waste wash liquor will be put into effluent settling chamber, and at last washed slurry be put into reserve pit and add bleaching stibilizer Na
2O
2Reacted 5 minutes, and left standstill the finished product paper pulp that can obtain more than at least 550 kilograms;
The process for purifying waste water section comprises the steps:
1) to the effluent settling chamber of depositing pulp-making waste-water and waste wash liquor, add poly aluminium iron silicate and polyacrylamide organic high molecular polymer and carry out purified treatment, its consumption is 1.5% of a waste water gross weight, rapid precipitation, separation, and clear water can be used for pulp washing and recycles or discharge;
2) reclaim sediment, through concentrate and dried after obtain the solid shape organic matter of white, i.e. lignin calcium and lignin sodium mixture, this white shape organic matter admittedly can directly be done the construction material use.
Embodiment 3, and a kind of integrated paper pulping bleaching and process for purifying waste water, this processing step comprise paper pulping bleaching process section and process for purifying waste water section;
The paper pulping bleaching process section comprises the steps:
1) earlier with ready 1000 kilograms of reeds or/and reed reed is cut into 3～4cm fragment or thread standby;
2) according to the liquid material than 7: 1 proportional meter calculate the required water yield be 7000 kilograms standby, add these water in stirring pools again and begin heating;
3) normal pressure is down when heating-up temperature reaches 40 ℃, in stirring pool, add lignoenzyme, hydrogen peroxide generation enzyme, the amount that adds is 10.00umol/L, add pulping bleaching medicament NaOH, absolute ethyl alcohol, anthraquinone, its consumption is based on 1.0% of dry pulp weight, again with above-mentioned standby reed or/and reed reed is added in the stirring pool and begins stirs;
4) continue heating, normal pressure adds pulping bleaching medicament sodium polyphosphate, sulfamic acid down again when temperature is raised to 75 ℃, its consumption is based on 1.0% of dry pulp weight, is that 40 ℃～97 ℃ of internal controls make the temperature curve of whole process in temperature range, reacts and closes stirring in 55～60 minutes;
5) reed that will react then ,/and the resulting paper pulp of reed reed through the screening of sieving of 60 purposes sieves, the pulp-making waste-water after filtering is put into effluent settling chamber, the raw material that screening is got well is sent into high dense mill fiberizer and was carried out defibrination 3～5 minutes;
6) will grind good slurry with stock pump then and be extracted into kitchen sink and add washing slurry, waste wash liquor will be put into effluent settling chamber, and at last washed slurry be put into reserve pit and add bleaching stibilizer Na
2O
2Reacted 5 minutes, and left standstill and to obtain finished product paper pulp 560kg;
The process for purifying waste water section comprises the steps:
1) to the effluent settling chamber of depositing pulp-making waste-water and waste wash liquor, adding poly aluminium iron silicate, shitosan complexing agent carry out purified treatment, and its consumption is 3.5% of a waste water gross weight, rapid precipitation, separation, and clear water can be used for pulp washing and recycles or discharge;
2) reclaim sediment, through concentrate and dried after obtain the solid shape organic matter of white, i.e. lignin calcium and lignin sodium mixture, this white shape organic matter admittedly can directly be done the construction material use.
Embodiment 4, and a kind of integrated paper pulping bleaching and process for purifying waste water, this processing step comprise paper pulping bleaching process section and process for purifying waste water section;
The paper pulping bleaching process section comprises the steps:
1) earlier with ready 1000 kilograms of giantreeds or/and hybrid giant napier is cut into 3～4cm fragment or thread standby;
2) according to the liquid material than 8: 1 proportional meter calculate the required water yield be 8000 kilograms standby, add these water in stirring pools again and begin heating;
3) normal pressure when heating-up temperature reaches 40 ℃, adds lignoenzyme down in stirring pool, hydrogen peroxide generates enzyme, and the amount of adding is 20.001umol/L, adds pulping bleaching medicament Na
2SO
3, dodecane fundamental mode bleeding agent, its consumption is based on 1.2% of dry pulp weight, again with above-mentioned standby giantreed or/and hybrid giant napier is added in the stirring pool and is begun stirs;
4) continue heating, normal pressure adds pulping bleaching medicament Na down again when temperature is raised to 75 ℃
2SiO
3, absolute ethyl alcohol, dodecane fundamental mode bleeding agent, its consumption is based on 1.5% of dry pulp weight, is that 40 ℃～97 ℃ of internal controls make the temperature curve of whole process in temperature range, reacts and closes stirring in 55～60 minutes;
5) giantreed that will react is then put into effluent settling chamber or/and the resulting paper pulp of hybrid giant napier sieves the screening of sieving through 60 purposes with the pulp-making waste-water after filtering, and the raw material that screening is good is sent into high dense mill fiberizer and carried out defibrination 3～5 minutes;
6) will grind good slurry with stock pump then and be extracted into kitchen sink and add washing slurry, waste wash liquor will be put into effluent settling chamber, and at last washed slurry be put into reserve pit and add bleaching stibilizer H
2O
2Reacted 5 minutes, and left standstill and to obtain finished product paper pulp 550kg;
The process for purifying waste water section comprises the steps:
1) to the effluent settling chamber of depositing pulp-making waste-water and waste wash liquor, adding polyacrylamide, shitosan complexing agent carry out purified treatment, and its consumption is 5.5% of a waste water gross weight, rapid precipitation, separation, and clear water can be used for pulp washing and recycles or discharge;
2) reclaim sediment, through concentrate and dried after obtain the solid shape organic matter of white, i.e. lignin calcium and lignin sodium mixture, this white shape organic matter admittedly can directly be done the construction material use.
Claims (10)
1. integrated paper pulping bleaching and process for purifying waste water is characterized in that this processing step comprises two process sections, are respectively pulping bleaching process section and process for purifying waste water section;
Described pulping bleaching process section comprises the steps:
1) earlier ready pulping raw material is cut into 3～4cm fragment or silk is standby;
2) more standby according to the liquid material than calculating the required water yield, again it is added in the stirring pool and begins and heat;
3) normal pressure when heating-up temperature reaches 40 ℃, adds biology enzyme and pulping bleaching medicament down in stirring pool, adds above-mentioned pulping raw material in the stirring pool again and begins and stir;
4) continue heating, normal pressure adds the pulping bleaching medicament down again when temperature is raised to 75 ℃, be that 40 ℃～97 ℃ of internal controls make the temperature curve of whole process in temperature range, reacts and closes stirring in 55～60 minutes;
5) paper pulp raw material that will react then sieves the screening of sieving through 60 purposes, and the pulp-making waste-water after filtering is put into effluent settling chamber, and the raw material that screening is good is sent into high dense mill fiberizer and carried out defibrination 3～5 minutes;
6) will grind good slurry with stock pump then and be extracted into kitchen sink and add washing slurry, waste wash liquor will be put into effluent settling chamber, and at last washed slurry be put into reserve pit and added bleaching stibilizer reaction 5 minutes, and leave standstill and to obtain finished product paper pulp;
Described process for purifying waste water section comprises the steps:
1) add the special efficacy water purification agent to the effluent settling chamber of depositing pulp-making waste-water and waste wash liquor and carry out purified treatment, rapid precipitation, separation, clear water can be used for pulp washing and recycles or discharge;
2) reclaim sediment, obtain the solid shape organic matter of white after concentrated and dried, the solid shape organic matter of this white can directly be done the construction material use.
2. according to described integrated paper pulping bleaching of claim 1 and process for purifying waste water, it is characterized in that: described liquid material is 5～8 than the oven dry weight part ratio by its raw material: 1.
3. according to described integrated paper pulping bleaching of claim 1 and process for purifying waste water, it is characterized in that: described biology enzyme is the mixture that papain, lignin peroxidase, lignoenzyme, hydrogen peroxide generate enzyme and coenzyme catalyzing enzyme any one or they, and its consumption is 0.001～20umol/L.
4. according to described integrated paper pulping bleaching of claim 1 and process for purifying waste water, it is characterized in that: the described pulping bleaching medicament that adds when temperature is 40 ℃ is NaOH, Na
2SO
3, absolute ethyl alcohol, dodecane fundamental mode bleeding agent, anthraquinone or their mixture, its consumption is based on 0.05～1.2% of dry pulp weight.
5. according to described integrated paper pulping bleaching of claim 1 and process for purifying waste water, it is characterized in that: the described pulping bleaching medicament that adds when temperature is 75 ℃ is GaCO
3, Na
2SiO
3, MgSO
4, EDTA, sodium polyphosphate, sulfamic acid, permonosulphuric acid or their mixture, its consumption is based on 0.07～1.5% of dry pulp oven dry weight.
6. according to described integrated paper pulping bleaching of claim 1 and process for purifying waste water, it is characterized in that: described pulping bleaching stabilizing agent is Na
2O
2Or H
2O
2Or their mixture, its consumption is based on 0.02～1.1% of dry pulp amount.
7. according to arbitrary integrated paper pulping bleaching of claim 1～6 and process for purifying waste water, it is characterized in that: described pulp density is 5～10%, the pH value of pulp slurry is 9～11, and speed of agitator is 25～80 rev/mins, and the rotating speed during described defibrination is 50～150 rev/mins.
8. according to described integrated paper pulping bleaching of claim 7 and process for purifying waste water, it is characterized in that: described special efficacy water purification agent is that inorganic water purification agent of macromolecule and organic flocculants generate composite water purifying agent by the method that connects fat; Described composite water purifying agent is that two or more polymer of PAFS, poly aluminium iron silicate, polyacrylamide, shitosan connects the fat reaction and generates complexing agent, and its consumption is 1.5～5.5% of a waste water gross weight.
9. described according to Claim 8 integrated paper pulping bleaching and process for purifying waste water, it is characterized in that: described raw material comprises non-wood fibrous raw material, and described non-wood fibrous raw material comprises wheat straw, straw, Chinese alpine rush, bagasse, cotton bar, reed, reed reed, giantreed, hybrid giant napier and other non-wood-fibers.
10. according to described integrated paper pulping bleaching of claim 9 and process for purifying waste water, it is characterized in that: the solid shape organic matter of described white is lignin calcium and lignin sodium mixture.
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|---|---|---|---|
| CN200910023045XA CN101597871B (en) | 2009-06-25 | 2009-06-25 | Paper pulping bleaching and waste water purification integration technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910023045XA CN101597871B (en) | 2009-06-25 | 2009-06-25 | Paper pulping bleaching and waste water purification integration technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101597871A true CN101597871A (en) | 2009-12-09 |
| CN101597871B CN101597871B (en) | 2011-09-21 |
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ID=41419458
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|---|---|---|---|
| CN200910023045XA Expired - Fee Related CN101597871B (en) | 2009-06-25 | 2009-06-25 | Paper pulping bleaching and waste water purification integration technology |
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| CN102321992A (en) * | 2011-06-22 | 2012-01-18 | 韩保新 | Agent for recycling straws by using biologically cold fermentation method and process for producing plant fibers by using straws with biologically cold fermentation method |
| CN102108650B (en) * | 2009-12-29 | 2013-11-20 | 李�昊 | Zero-wastewater-emission pulping method |
| CN105178091A (en) * | 2015-08-13 | 2015-12-23 | 合肥龙发包装有限公司 | Waterproof corrugated paper pulp and producing method thereof |
| CN105986498A (en) * | 2015-02-16 | 2016-10-05 | 李�昊 | Technological method for achieving zero discharge of alkaline pulping waste water containing sodium or potassium |
| CN108797195A (en) * | 2018-06-28 | 2018-11-13 | 泾县狸宣文化用品有限公司 | A kind of paper technology improving paper durable waterproof performance |
| CN109706772A (en) * | 2019-02-01 | 2019-05-03 | 丰禾新材（北京）技术有限公司 | A kind of normal pressure paper pulp making technology |
| SE1751468A1 (en) * | 2017-11-29 | 2019-05-30 | Axolot Solutions Ab | Method and a system for washing paper pulp |
| CN111074661A (en) * | 2020-01-06 | 2020-04-28 | 四川工商职业技术学院 | Production method of high-yield bamboo pulp |
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| CN113062138A (en) * | 2021-04-22 | 2021-07-02 | 山东银鹰股份有限公司 | Preparation method of pulp for preparing viscose fiber from seed hemp |
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| CN102108650B (en) * | 2009-12-29 | 2013-11-20 | 李�昊 | Zero-wastewater-emission pulping method |
| CN102321992B (en) * | 2011-06-22 | 2012-07-04 | 韩保新 | Agent for recycling straws by using biologically cold fermentation method and process for producing plant fibers by using straws with biologically cold fermentation method |
| CN102321992A (en) * | 2011-06-22 | 2012-01-18 | 韩保新 | Agent for recycling straws by using biologically cold fermentation method and process for producing plant fibers by using straws with biologically cold fermentation method |
| CN105986498A (en) * | 2015-02-16 | 2016-10-05 | 李�昊 | Technological method for achieving zero discharge of alkaline pulping waste water containing sodium or potassium |
| CN105178091A (en) * | 2015-08-13 | 2015-12-23 | 合肥龙发包装有限公司 | Waterproof corrugated paper pulp and producing method thereof |
| SE1751468A1 (en) * | 2017-11-29 | 2019-05-30 | Axolot Solutions Ab | Method and a system for washing paper pulp |
| CN108797195A (en) * | 2018-06-28 | 2018-11-13 | 泾县狸宣文化用品有限公司 | A kind of paper technology improving paper durable waterproof performance |
| CN109706772A (en) * | 2019-02-01 | 2019-05-03 | 丰禾新材（北京）技术有限公司 | A kind of normal pressure paper pulp making technology |
| CN111074661A (en) * | 2020-01-06 | 2020-04-28 | 四川工商职业技术学院 | Production method of high-yield bamboo pulp |
| CN112933729A (en) * | 2021-01-28 | 2021-06-11 | 南京可常道商贸有限公司 | High whiteness sanitary towel thick liquid concentrator |
| CN113062138A (en) * | 2021-04-22 | 2021-07-02 | 山东银鹰股份有限公司 | Preparation method of pulp for preparing viscose fiber from seed hemp |
| CN115726186A (en) * | 2021-08-31 | 2023-03-03 | 山东双圆生物科技有限公司 | Waste cloth decolorizing agent containing biological enzyme, preparation method, treating agent and application |
| CN116516715A (en) * | 2023-05-27 | 2023-08-01 | 山东科迈生物制浆有限公司 | Grass fiber pulping process for inhibiting generation of peculiar smell |
| CN116516715B (en) * | 2023-05-27 | 2024-01-19 | 山东科迈生物制浆有限公司 | Grass fiber pulping process for inhibiting generation of peculiar smell |
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| CN101597871B (en) | 2011-09-21 |
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