CN1050642C - Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide - Google Patents
Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide Download PDFInfo
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- CN1050642C CN1050642C CN96108334A CN96108334A CN1050642C CN 1050642 C CN1050642 C CN 1050642C CN 96108334 A CN96108334 A CN 96108334A CN 96108334 A CN96108334 A CN 96108334A CN 1050642 C CN1050642 C CN 1050642C
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Abstract
The present invention relates to a hydrogen peroxide bleaching method for producing 30 to 150 tons of high concentration pulp each day. The method comprises: low concentration pulp enters a double net pulp extruder and enters a fluffer after concentration is increased; fluffed paper pulp is conveyed to a material conveying screw machine, steam is simultaneously fed to increase the temperature of the paper pulp, and the paper pulp is conveyed into a high concentration mixer; 1 to 3 wt% of hydrogen peroxide measured by absolute dry pulp and a bleaching assistant are added into the high concentration mixer and mixed with the paper pulp, and the mixed paper pulp is conveyed into a bleaching reaction tower from the top of the tower; the paper pulp reacts for 1.5 to 2.5 hours in the bleaching reaction tower at the temperature of 60 to 80 DEG C and under normal pressure and discharged from a material discharge machine at the bottom of the tower, and bleached pulp is obtained through neutralization and washing; the present invention makes wastewater discharged by paper pulp bleaching in paper making industry conform to the Chinese standards and not pollute the environment.
Description
The present invention relates to the dioxde pulp bleaching process of pulp and paper industry.Relate to the hydrogen peroxide bleaching method of careless class paper pulp in more detail.
China existing daily output 30-150 ton grass class association with pulp bleaching mainly is to utilize chlorination bleaching and hypochlorite bleaching method, and the discharge wastewater toxicity of this method is very big, and wastewater flow rate is many, thereby makes pulp and paper industry have three big problems:
(1) serious environment pollution makes pulp and paper industry become one of three the most serious big industries of China's environmental pollution;
(2) severe contamination pulping and papermaking equipments, thus equipment and materials is proposed too high requirement, damage otherwise will speed up ageing equipment;
(3) have a strong impact on the healthy of operator.
External reason has the paper pulp hydrogen peroxide bleaching method is also arranged in the technology, but this method only is applicable to wood type paper pulp, is not suitable for careless class paper pulp.This is that fibre concentration is lower, and careless class paper pulp the ash content of coal height because grass fiber is shorter than wood pulp fibre.So the hydrogen peroxide bleaching method of wood pulp can not be applicable to the hydrogen peroxide bleaching method of straw pulp fully.
The object of the present invention is to provide a kind of method for bleaching of high consistency pulp, especially be fit to do the hydrogen peroxide bleaching method of high dense careless class paper pulp, make discharge waste water reach environmental requirement, pollution-free to pulping and papermaking equipments, do not influence the healthy of workman.
Because the production scale of China's paper pulp is daily output 30-150 ton oven dry stock mostly, for example 30 ton per days, 50 ton per days, 100 ton per days, 150 ton per days, the present invention studies the high consistency pulp method for bleaching of these scales emphatically.
The high consistency pulp hydrogen peroxide bleaching method of daily output 30-150 ton oven dry stock of the present invention comprises the steps:
(1) make the low-consistency stock of 3～6% weight enter twin-wire press, pulp density enters fluffer after bringing up to 30～35% weight; Pulp flocculation group after discongesting is no more than 5mm
3
(2) paper pulp after discongesting is admitted to defeated material screw machine, feeds steam at defeated material screw machine simultaneously, makes the paper pulp temperature rise to 60～80 ℃, and the paper pulp of discharge is sent into high dense blender;
(3) add 1～3% weight (in oven dry stock) hydrogen peroxide, bleaching assistant at the dense blender of height, mix with paper pulp, the uniformity reaches more than 94%, mixes back paper pulp and sends into the bleaching action tower from cat head;
(4) paper pulp reacted 1.5～25 hours under temperature is 60～80 ℃, normal pressure in the bleaching action tower, discharge by the discharge machine at the bottom of the tower, after neutralization, washing bleached pulp.
The bleaching assistant of indication of the present invention is the NaOH of 0.5～1.0 times of hydrogen peroxide addition, the silicate of 3～6% weight (in oven dry stock), 0.2～0.3% EDTA (in oven dry stock) or 0.3～0.4%DTPA (in oven dry stock), or the mixture between above-mentioned each material.
Paper pulp used in the present invention can be wooden class Mechanical Method slurry, and wooden class chemical method slurry, or wooden class chemical mechanical pulping slurry also can be careless class chemical method slurry, careless class Mechanical Method slurry or careless class chemical mechanical pulping slurry.
Equipment used in the present invention can be commercially available, also can self design.
The present invention compared with prior art has following advantage:
1. the waste water that the association with pulp bleaching of paper industry is discharged meets state specified standards, and environment is not brought pollution.
2. the equipment in association with pulp bleaching workshop and the equipment of downstream process workshop section are not produced any pollution, so just prolonged the service life of equipment, reduced the running cost of pulping and paper-making factory.
3. make the discharge waste water environmental pollution degree of pulping and paper-making factory reduce half, make pulp and paper industry stride forward major step to clean industry.
4. because bleaching agent and bleaching assistant are nontoxic, and bleaching effluent is nontoxic, thereby to operator's healthy nothing influence.And the waste water of present traditional chlorine bleach method contains extremely toxic substance, and workman's physical and mental health is encroached on.
5. because operating system automation and serialization degree height, thereby make association with pulp bleaching quality height, more can not damage quality of fibre in the paper pulp.
Below by embodiment the present invention is further described below.
Embodiment one
Produce 30 ton 30% high dense kenaf whole stalk grass plasmoid hydrogen peroxide bleaching method daily
(1) kenaf whole stalk (drafting a document class) chemical mechanical pulping paper pulp, whiteness 25%ISO, 30 ℃ of temperature, concentration 6%.Send into twin-wire press with stock pump, the twin-wire press model is TWP30, and Fujian Machinery Plant of Light Industry makes.
(2) paper pulp of handling through twin-wire press is extruded concentration 33%, and sheet enters fluffer, and fluffer is discongested back paper pulp and become dispersed, and the poly-group of wadding maximum is no more than 5mm
3, the fluffer model is TD30, Fujian Machinery Plant of Light Industry makes.
(3) paper pulp after discongesting is carried by the spiral conveyer that is installed on the fluffer bottom, sends into steam in spiral conveyer simultaneously, guarantees that the paper pulp temperature rises to 70 ℃.The steam heat of per hour importing spiral conveyer is 28000 kilocalories of (absolute dried paper pulp)+119600 kilocalorie (moisture content in the paper pulp), is 147600 kilocalories altogether.
(4) pulp density of sending into high dense blender is 28%, 70 ℃ of temperature, and the input pipe by the dense mixer of height adds hydrogen peroxide and bleaching assistant respectively, and its addition is:
Hydrogen peroxide addition 2% (to cut off) in paper pulp
Addition amount of sodium hydroxide 2% (in absolute dried paper pulp)
Silicate addition 4% (to cut off) in paper pulp
DTPA addition 0.4% (to cut off) in paper pulp
Above-mentioned bleaching assistant and paper pulp are fully mixed in the dense mixer of height, and mixture homogeneity reaches 94%.The model of spiral conveyer and high dense mixer is respectively SPP30, HPM30, and Fujian Machinery Plant of Light Industry makes.
(5) mix back paper pulp and directly send into the bleaching action column overhead, 70 ℃ of reaction tower temperature, normal pressure, the paper pulp flowing time at the bottom of from cat head to tower is exactly the reaction time, promptly 2.5 hours.Tower height 13m, diameter 1m.The model of bleaching action tower is HPB30, and Fujian Machinery Plant of Light Industry makes.
(6) paper pulp is by the discharge machine dispatch of bleaching action tower bottom, through neutralization, must bleached pulp after the washing, and whiteness reaches 60%ISO, whiteness increment 35%ISO.
(7) above-mentioned paper pulp transfers to 5% concentration again after washing, and carries out the high consistency pulp hydrogen peroxide bleaching according to above-mentioned (1) once more to (6) step, and whiteness can reach 75%ISO, satisfies the general needs of cultural paper whiteness.
Rinsing maching is the Type B vacuum pulp washing machine that selects Xi'an Paper Making Machinery Plant to make.
Discharge waste water BOD5≤150mg/l, COD≤350mg/l.Be lower than the secondary standard of country.
Embodiment two
Produce 150 tons high dense Eucalyptus machine slurry hydrogen peroxide bleaching methods daily.
(1) through NaOH and Na
2O
3Pretreated its whiteness of Eucalyptus machine natural color pulp reaches 33%ISO, and 30 ℃ of concentration 4% of temperature are sent into twin-wire press.The twin-wire press model is TWP150, and Fujian Machinery Plant of Light Industry makes.
(2) extruding concentration through the paper pulp of twin-wire press processing is 35%, and sheet is fallen into fluffer automatically, and fluffer is discongested back paper pulp and become dispersed, and the poly-group of a wadding maximum is no more than 5mm
3, the fluffer model is TD1150, Fujian Machinery Plant of Light Industry makes.
(3) paper pulp after discongesting is carried by the spiral conveyer that is installed on the fluffer bottom, in spiral conveyer, send into steam simultaneously, guarantee that the paper pulp temperature rises to 80 ℃, it is that 156280 kilocalories of (absolute dried paper pulp)+597700 kilocalorie (moisture content in the paper pulp) are altogether for per hour importing 753980 kilocalories of heats that steam heat is per hour imported heat.The spiral conveyer model is SPP150, and Fujian Machinery Plant of Light Industry makes.
(4) send into the pulp density 28% of high dense mixer, 75 ℃ of temperature, input pipe by the dense mixer of height is imported hydrogen peroxide and bleaching assistant respectively, its addition is: hydrogen peroxide 2.5% (to cut off in paper pulp), NaOH 1.5% (in absolute dried paper pulp), silicate 5% (in absolute dried paper pulp), EDTA 0.3% (in absolute dried paper pulp), DTPA 0.3% (to cut off) in paper pulp, other activating agents 0.3% (in oven dry stock), high dense mixer model HPM150, Fujian Machinery Plant of Light Industry makes.
(5) mix back paper pulp and directly send into the bleaching action column overhead, 70 ℃ of reaction temperatures, 2 hours reaction time, bleaching action tower model HPB150, tower height 15m, diameter 1.8m, Fujian Machinery Plant of Light Industry makes.
(6) paper pulp is by the discharge machine dispatch of bleaching action tower bottom, must bleached pulp after neutralization, washing, and whiteness reaches 70%ISO.Neutralizing tower is made by Fujian Machinery Plant of Light Industry, the Type B vacuum pulp washing machine that rinsing maching is made for Xi'an Paper Making Machinery Plant.
(7) bleach once more to (6) step according to above-mentioned (1), pulp brightness can reach 80%ISO.
Discharge waste water BOD5≤150mg/l, COD≤350mg/l.Be lower than the secondary standard of country.
Embodiment three
Produce 100 tons high dense wheat straw chemi-mechanical pulp hydrogen peroxide bleachings daily, magma is from spending 30%ISO, 25 ℃ of temperature.
(1) through the paper pulp behind the 0.4%DTPA preliminary treatment 10min, concentration 3% is sent into the anti-pulp grinder of two nets, twin-wire press model TWP100, and Fujian Machinery Plant of Light Industry makes, and extrudes concentration 30%.
(2) paper pulp of sheet is fallen into fluffer automatically by twin-wire press, and fluffer is discongested back paper pulp and become dispersed, and the poly-group of wadding is no more than 5mm
3, fluffer model TD100, Fujian Machinery Plant of Light Industry makes.
(3) the paper pulp temperature in spiral conveyer after discongesting rises to 60 ℃, and per hour importing steam heat is 540000 kilocalories, spiral conveyer model SPP100, and Fujian Machinery Plant of Light Industry makes, and slurry concentration reduces to 27%.
(4) send into the pulp density 27% of high dense blender, 60 ℃ of temperature, in the dense mixer of height, add bleaching agent and auxiliary agent simultaneously, be hydrogen peroxide addition 3% (in absolute dried paper pulp), addition amount of sodium hydroxide 2% (in oven dry stock), silicate addition 4.5% (in absolute dried paper pulp), DTPA 0.2% (in absolute dried paper pulp), other activating agents 0.4% (with absolute dried paper pulp), high dense mixer model HPM100, Fujian Machinery Plant of Light Industry makes.
(5) mix back paper pulp and directly send into the bleaching action column overhead, 60 ℃ of reaction tower temperature, 1.5 hours reaction time, reaction tower model HPB100, Fujian Machinery Plant of Light Industry makes.
(6) paper pulp is by the discharge machine dispatch of bleaching action tower bottom, must bleached pulp after neutralization, washing, and whiteness can reach 55%ISO.Neutralizing tower is made by Fujian Machinery Plant of Light Industry, the Type B vacuum pulp washing machine that rinsing maching is made for Xi'an Paper Making Machinery Plant.
(7) bleach once more according to above-mentioned (1)～(6) step, pulp brightness can reach 70%ISO.Discharge waste water BOD5≤150mg/l, COD≤350mg/l.Be lower than the secondary standard of country.
Claims (2)
1 one kinds of everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide is characterized in that comprising the steps:
(1) make the low-consistency stock of 3～6% weight enter twin-wire press, pulp density enters fluffer after bringing up to 30～35% weight; Pulp flocculation group after discongesting is no more than 5mm
3
(2) paper pulp after discongesting is admitted to defeated material screw machine, feeds steam at defeated material screw machine simultaneously, makes the paper pulp temperature rise to 60～80 ℃, and the paper pulp of discharge is sent into high dense blender;
(3) add 1～3% weight (in oven dry stock) hydrogen peroxide, bleaching assistant at the dense blender of height, mix with paper pulp, the uniformity reaches more than 94%, mixes back paper pulp and sends into the bleaching action tower from cat head;
(4) paper pulp reacted 1.5～2.5 hours under temperature is 60～80 ℃, normal pressure in the bleaching action tower, discharge by the discharge machine at the bottom of the tower, after neutralization, washing bleached pulp.
2 methods according to claim 1, the bleaching assistant that it is characterized in that indication is the NaOH of 0.5～1.0 times of hydrogen peroxide addition, the silicate of 3～6% weight (in oven dry stock), 0.2～0.3% EDTA (in oven dry stock) or 0.3～0.4%DTPA (in oven dry stock), or the mixture between above-mentioned each material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96108334A CN1050642C (en) | 1996-06-25 | 1996-06-25 | Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96108334A CN1050642C (en) | 1996-06-25 | 1996-06-25 | Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide |
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| Publication Number | Publication Date |
|---|---|
| CN1144289A CN1144289A (en) | 1997-03-05 |
| CN1050642C true CN1050642C (en) | 2000-03-22 |
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| CN96108334A Expired - Fee Related CN1050642C (en) | 1996-06-25 | 1996-06-25 | Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107140C (en) * | 1998-05-14 | 2003-04-30 | 华南理工大学 | Method for bleaching medium thick paper pulp by for hydrogen peroxide for medium-small paper mill |
| CN100412267C (en) * | 2006-04-30 | 2008-08-20 | 华南理工大学 | Method for bleaching middle and thick paper pulp by hydrogen peroxide and through double bleaching tower |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078185B (en) * | 2006-05-24 | 2012-05-23 | 黄正华 | Application of sodium peroxide mixing solution containing sodium ozonide in preparing paper pulp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038921A (en) * | 1988-04-15 | 1990-01-24 | 纳幕尔杜邦公司 | Handle improving one's methods of non-wooden ligno-ccllulose base-material with alkaline peroxide |
| CN1069304A (en) * | 1990-05-17 | 1993-02-24 | 友联坎普专利控股有限公司 | Improve the method for bleached wood fiber's material of environment |
| CN1117301A (en) * | 1993-01-29 | 1996-02-21 | 卡瓦尔纳制浆技术公司 | Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent |
-
1996
- 1996-06-25 CN CN96108334A patent/CN1050642C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1038921A (en) * | 1988-04-15 | 1990-01-24 | 纳幕尔杜邦公司 | Handle improving one's methods of non-wooden ligno-ccllulose base-material with alkaline peroxide |
| CN1069304A (en) * | 1990-05-17 | 1993-02-24 | 友联坎普专利控股有限公司 | Improve the method for bleached wood fiber's material of environment |
| CN1117301A (en) * | 1993-01-29 | 1996-02-21 | 卡瓦尔纳制浆技术公司 | Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107140C (en) * | 1998-05-14 | 2003-04-30 | 华南理工大学 | Method for bleaching medium thick paper pulp by for hydrogen peroxide for medium-small paper mill |
| CN100412267C (en) * | 2006-04-30 | 2008-08-20 | 华南理工大学 | Method for bleaching middle and thick paper pulp by hydrogen peroxide and through double bleaching tower |
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| Publication number | Publication date |
|---|---|
| CN1144289A (en) | 1997-03-05 |
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