CN103147329A - Energy-saving and consumption-reducing technology for APMP (Aalkaline Peroxide Mechanical Pulp) pulping - Google Patents

Energy-saving and consumption-reducing technology for APMP (Aalkaline Peroxide Mechanical Pulp) pulping Download PDF

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Publication number
CN103147329A
CN103147329A CN2013100664614A CN201310066461A CN103147329A CN 103147329 A CN103147329 A CN 103147329A CN 2013100664614 A CN2013100664614 A CN 2013100664614A CN 201310066461 A CN201310066461 A CN 201310066461A CN 103147329 A CN103147329 A CN 103147329A
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China
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slurry
sections
apmp
screening
section
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CN2013100664614A
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Chinese (zh)
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张美云
齐书田
王建
吴养育
刘叶
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陕西科技大学
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Publication of CN103147329A publication Critical patent/CN103147329A/en

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Abstract

The invention relates to an energy-saving and consumption-reducing technology for APMP (Aalkaline Peroxide Mechanical Pulp) pulping. Through optimizing the traditional APMP pulping flow, after primary-stage pulp grinding, the pulp material is screened, and residue pulp material is mixed with screened good pulp material after secondary-stage pulp grinding to prepare the APMP material, so as to reduce the amount of pulp material entering the secondary-stage pulp grinding, as a result, energy conservation and consumption reduction of the APMP pulping are realized, and meanwhile, flexible control to the quality of APMP is implemented.

Description

A kind of APMP slurrying technique of saving energy and reduce the cost

Technical field

The present invention relates to the preparation technology of the Alkaline Peroxide Mechanical Pulp of field of papermaking, particularly the energy-saving and cost-reducing technique of a kind of APMP slurrying.

Background technology

APMP(Aalkaline Peroxide Mechanical Pulp), translator of Chinese is Alkaline Peroxide Mechanical Pulp, be a kind of environment-friendly type, the energy-saving new pulping process of releasing the eighties in 20th century, have the outstanding advantages such as high yield, high whiteness, high light scattering property and low pollution, low cost.

APMP pulping process route is generally: length 15~20mm, thickness 3~5mm, width are removed silt less than the wood chip of 10mm through water washing; The pre-gas that carries out 10~20min under 80~90 ℃ steams; The pre-wood chip that steams utilizes compression ratio to flood respectively the alkaline H of chelating agent, total consumption 30% after pushing for two sections extruders of 1:2.8~4.0 2O 2Enter respective reaction storehouse reaction 30~60min; Reacted slurry carries out defibrination one time under 35~45% concentration; The H that adds residue 70% after defibrination 2O 2Carry out the bleaching of 60~90min, be diluted to concentration 3~6% after bleaching finishes and enter eliminating potential pool, the rear two sections defibrinations that carry out under 3~6% concentration of diving disappear, slurry freedom 500~600ml after mill, after mill, slurry carries out two sections screenings under 2~3% concentration, and the concentration storage with 10~15% after good slurry dehydration is standby.Realizing final APMP slurrying by above operation, or bleaching process is optimized, is mainly to adjust adding mode and adding a little of bleached chemical medicine, realizes the slurrying of PRC-APMP.Be no matter the PRC-APMP slurrying after APMP slurrying or improvement, be all that the wood chip after extruding is all latent through disappearing after one section mill, then through two sections mills, obtain the slurry of certain freedom.The finished product slurry is by two sections screenings, and the good slurry after screening is standby in the pulp storage tower storage, after the slag slurry of second segment sieve purifies through hydrocyclone, through slag slurry mill defibrination, then cross the slag pulp screen, the good slurry of slag pulp screen mixes with two sections good slurries of sieve, and the slag slurry is again through the circulation again of slag slurry mill.

Because the desired APMP quality of different paper kinds is different, after grinding by control in production, the freedom of APMP pulping, realize different paper needs.As for the production of art post paperboard the time, control the pulping freedom at 380~430ml; When producing Cultural Paper, increase again low dense mill in system, control the pulping freedom at 150~200ml.There is the opposition of bulk and intensity in the APMP that this mode of production is produced, is unfavorable for giving full play to the APMP characteristics, has limited the paper properties of gained slurry; Simultaneously, the APMP production process needs powerful high concentration plate mill and wood chip press screw, and this is all to consume the very high equipment of electric energy, has directly caused APMP slurrying energy consumption can not to be in any more.In order to reduce the APMP energy consumption, a large amount of research both at home and abroad all finds, enzyme is processed and helped the reduction that defibrination can be good, but enzyme treatment process is controlled difficulty and the processing time is longer, so use more difficult in production practices.The energy consumption, the reduction second segment refining concentration that wood chip are carried out Chemical Pretreatment, recovery defibrination process are all helpful to the energy consumption that reduces APMP production, but these methods all are difficult to realize the change machine is starched the flexible modulation of quality, have limited the use amount of change machine slurry in paper.

Summary of the invention

The object of the invention is to for above-mentioned the deficiencies in the prior art, provide a kind of and can reduce APMP slurrying energy consumption, and can implement simultaneously the energy-saving and cost-reducing technique of APMP slurrying that the APMP quality is controlled flexibly.

For achieving the above object, the technical solution used in the present invention is:

1) washing of wood chip: getting length is that 15~20mm, thickness are that 3~5mm, width are removed silt less than the wood chip of 10mm through water washing;

2) pre-gas steams: the pre-gas under 75~95 ℃ of the wood chip after washing steams 10~30min;

3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:2.8~4.0 to push and carry out heavy metal chelating in DTPA or EDTA under 40~60 ℃; The screw extrusion machine that recycles 1:2.8~4.0 after chelating is pushed, and the pH value that adds again chip quality 1.5~2.5% after extruding is 10~12 alkaline H 2O 2, react 40~60min and get slurry under 60~80 ℃;

4) one section defibrination: be to carry out one section defibrination 25~45% times with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 400~700ml; The H that adds chip quality 1~4% after defibrination 2O 2Carry out the bleaching of 80~120min;

5) one section screening: it is 1.5~2.5% to carry out one section screening that the slurry after bleaching is diluted to mass concentration;

6) two sections defibrinations: it is to carry out two sections defibrinations after 25~35% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 100~350ml;

7) two sections screenings: it is 1.5~2.5% to carry out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 25~35% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 200~450ml.

It is the slotted screen of 0.15mm that the gap is adopted in the screening of described step 5) and step 7).

In traditional APMP pulping process, after one section defibrination, most wood chip has been separated into fiber, and its fibre morphology is able to better reservation.When this part separated fiber enters two sections fiberizers, its fibre morphology will be damaged, and rugosity reduces, and is unfavorable for obtaining good bulk; Simultaneously, when changing the form of this part fiber, need to apply energy, increase the energy consumption of defibrination.The present invention utilizes screening, and this part separated fiber is taken out from slurry, does not carry out secondary pulping, can effectively keep the form of this part fiber; Simultaneously, the slag slurry after only screening carries out secondary pulping, has reduced the total amount of two sections defibrinations, thereby realizes the energy-saving and cost-reducing of APMP pulping process.In addition, by two sections defibrination quality of flexible control slag slurry and the ash-retention efficiency of controlling screening, mixed APMP quality is control effectively, thus the flexible control of enforcement APMP stock quality.

The specific embodiment

Embodiment 1:

1) washing of wood chip: getting length is that 15mm, thickness are that 3mm, width are removed silt less than the wood chip of 10mm through water washing;

2) pre-gas steams: the pre-gas under 95 ℃ of the wood chip after washing steams 10min;

3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:2.8 to push and carry out heavy metal chelating in DTPA under 40 ℃; After chelating, the screw extrusion machine of recycling 1:2.8 is pushed, and the pH value that adds again chip quality 1.5% after extruding is 10~12 alkaline H 2O 2, reaction 60min gets slurry under 60 ℃;

4) one section defibrination: be to carry out one section defibrination 25% time with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 400ml; The H that adds chip quality 2% after defibrination 2O 2Carry out the bleaching of 110min;

5) one section screening: it is that 1.5% to adopt the gap be that the slotted screen of 0.15mm carries out one section screening that the slurry after bleaching is diluted to mass concentration;

6) two sections defibrinations: it is to carry out two sections defibrinations after 25% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 300ml;

7) two sections screenings: it is that 1.5% to adopt the gap be that the slotted screen of 0.15mm carries out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 25% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 300ml.

Embodiment 2:

1) washing of wood chip: getting length is that 18mm, thickness are that 4mm, width are removed silt less than the wood chip of 10mm through water washing;

2) pre-gas steams: the pre-gas under 75 ℃ of the wood chip after washing steams 30min;

3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:3.5 to push and carry out heavy metal chelating in EDTA under 50 ℃; After chelating, the screw extrusion machine of recycling 1:3.5 is pushed, and the pH value that adds again chip quality 2.0% after extruding is 10~12 alkaline H 2O 2, reaction 40min gets slurry under 80 ℃;

4) one section defibrination: be to carry out one section defibrination 40% time with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 600ml; The H that adds chip quality 3% after defibrination 2O 2Carry out the bleaching of 90min;

5) one section screening: it is that 2.0% to adopt the gap be that the slotted screen of 0.15mm carries out one section screening that the slurry after bleaching is diluted to mass concentration;

6) two sections defibrinations: it is to carry out two sections defibrinations after 30% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 200ml;

7) two sections screenings: it is that 2.0% to adopt the gap be that the slotted screen of 0.15mm carries out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 30% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 400ml.

Embodiment 3:

1) washing of wood chip: getting length is that 20mm, thickness are that 5mm, width are removed silt less than the wood chip of 10mm through water washing;

2) pre-gas steams: the pre-gas under 80 ℃ of the wood chip after washing steams 25min;

3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:4.0 to push and carry out heavy metal chelating in DTPA under 60 ℃; After chelating, the screw extrusion machine of recycling 1:4.0 is pushed, and the pH value that adds again chip quality 1.8% after extruding is 10~12 alkaline H 2O 2, reaction 50min gets slurry under 70 ℃;

4) one section defibrination: be to carry out one section defibrination 30% time with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 550ml; The H that adds chip quality 1% after defibrination 2O 2Carry out the bleaching of 120min;

5) one section screening: it is that 1.8% to adopt the gap be that the slotted screen of 0.15mm carries out one section screening that the slurry after bleaching is diluted to mass concentration;

6) two sections defibrinations: it is to carry out two sections defibrinations after 35% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 100ml;

7) two sections screenings: it is that 1.8% to adopt the gap be that the slotted screen of 0.15mm carries out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 35% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 350ml.

Embodiment 4:

1) washing of wood chip: getting length is that 16mm, thickness are that 3.5mm, width are removed silt less than the wood chip of 10mm through water washing;

2) pre-gas steams: the pre-gas under 90 ℃ of the wood chip after washing steams 15min;

3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:3.7 to push and carry out heavy metal chelating in EDTA under 45 ℃; After chelating, the screw extrusion machine of recycling 1:3.7 is pushed, and the pH value that adds again chip quality 2.5% after extruding is 10~12 alkaline H 2O 2, reaction 55min gets slurry under 65 ℃;

4) one section defibrination: be to carry out one section defibrination 35% time with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 700ml; The H that adds chip quality 4% after defibrination 2O 2Carry out the bleaching of 80min;

5) one section screening: it is that 2.5% to adopt the gap be that the slotted screen of 0.15mm carries out one section screening that the slurry after bleaching is diluted to mass concentration;

6) two sections defibrinations: it is to carry out two sections defibrinations after 32% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 150ml;

7) two sections screenings: it is that 2.5% to adopt the gap be that the slotted screen of 0.15mm carries out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 32% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 450ml.

Embodiment 5:

1) washing of wood chip: getting length is that 19mm, thickness are that 4.5mm, width are removed silt less than the wood chip of 10mm through water washing;

2) pre-gas steams: the pre-gas under 85 ℃ of the wood chip after washing steams 20min;

3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:3.2 to push and carry out heavy metal chelating in DTPA under 55 ℃; After chelating, the screw extrusion machine of recycling 1:3.2 is pushed, and the pH value that adds again chip quality 2.3% after extruding is 10~12 alkaline H 2O 2, reaction 45min gets slurry under 75 ℃;

4) one section defibrination: be to carry out one section defibrination 45% time with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 500ml; The H that adds chip quality 3% after defibrination 2O 2Carry out the bleaching of 100min;

5) one section screening: it is that 2.3% to adopt the gap be that the slotted screen of 0.15mm carries out one section screening that the slurry after bleaching is diluted to mass concentration;

6) two sections defibrinations: it is to carry out two sections defibrinations after 28% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 350ml;

7) two sections screenings: it is that 2.3% to adopt the gap be that the slotted screen of 0.15mm carries out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 28% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 200ml.

Starch freedom after utilizing the present invention with one section mill and be controlled at 600ml, starch freedom after two sections mills and be controlled at 200ml, calculate power consumption and be the 857.89kw/t slurry, it is 400ml that APMP after, two section is combined as freedom, it becomes the paper tensile index is 15.28Nm/g, and bulk is 2.462cm 3/ g, internal bond strength are 186.35J/m 2

Utilize the present invention to control to starch freedom after one section mill and be 550ml, starch freedom after two sections mills and be controlled at 100ml, calculate power consumption and be the 875.38kw/t slurry, it is 350ml that APMP after, two section is combined as freedom, it becomes the paper tensile index is 16.57Nm/g, and bulk is 2.437cm 3/ g, internal bond strength are 178.53J/m 2

Do not use the freedom of improved procedure production to be the APMP of 350ml, its power consumption is the 922.21kw/t slurry, and it becomes paper tensile index is 14.32Nm/g, and bulk is 2.396cm 3/ g, internal bond strength are 160.87J/m 2

Claims (2)

1. the energy-saving and cost-reducing technique of an APMP slurrying is characterized in that comprising the following steps:
1) washing of wood chip: getting length is that 15~20mm, thickness are that 3~5mm, width are removed silt less than the wood chip of 10mm through water washing;
2) pre-gas steams: the pre-gas under 75~95 ℃ of the wood chip after washing steams 10~30min;
3) extruding, dipping: impregnated in after the wood chip after pre-gas is steamed utilizes the screw extrusion machine of 1:2.8~4.0 to push and carry out heavy metal chelating in DTPA or EDTA under 40~60 ℃; The screw extrusion machine that recycles 1:2.8~4.0 after chelating is pushed, and the pH value that adds again chip quality 1.5~2.5% after extruding is 10~12 alkaline H 2O 2, react 40~60min and get slurry under 60~80 ℃;
4) one section defibrination: be to carry out one section defibrination 25~45% times with above-mentioned gained slurry in mass concentration, after mill, the slurry freedom is controlled at 400~700ml; The H that adds chip quality 1~4% after defibrination 2O 2Carry out the bleaching of 80~120min;
5) one section screening: it is 1.5~2.5% to carry out one section screening that the slurry after bleaching is diluted to mass concentration;
6) two sections defibrinations: it is to carry out two sections defibrinations after 25~35% that the slag after above-mentioned one section screening slurry is concentrated into mass concentration, and after mill, the slurry freedom is 100~350ml;
7) two sections screenings: it is 1.5~2.5% to carry out two sections screenings that the slurry after two sections mills is diluted to mass concentration, slag slurry after screening is sent into after two sections defibrination stations and one section screening slag to be starched and mixes that to be concentrated into mass concentration be 25~35% to enter two sections mills, after screening with one section the APMP process conical refiner that obtains, the APMP that obtains with two sections screenings mixes, send into eliminating potential pool, disappearing, to be concentrated into mass concentration after diving be 10% to store standbyly, and mixing the slurry freedom is 200~450ml.
2. the energy-saving and cost-reducing technique of APMP slurrying according to claim 1, it is characterized in that: it is the slotted screen of 0.15mm that the gap is adopted in the screening of described step 5) and step 7).
CN2013100664614A 2013-03-01 2013-03-01 Energy-saving and consumption-reducing technology for APMP (Aalkaline Peroxide Mechanical Pulp) pulping CN103147329A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890888A (en) * 1992-12-23 1999-04-06 F. L. Smidth & Co. A/S Method and cooler for cooling particulate material
CN1587502A (en) * 2004-09-14 2005-03-02 天津科技大学 New process for producing alkaline hydrogen peroxide mechanical pulp by double scrwe extruding method
CN101046072A (en) * 2006-03-28 2007-10-03 天津科技大学 Pre-treatment process for producing bleached slurry with cotton stalk material
CN101319470A (en) * 2008-07-01 2008-12-10 李�昊 Improved APMP pulping method
CN101492891A (en) * 2009-03-11 2009-07-29 陕西科技大学 Method for producing and bleaching slasher sizing with oil windmill palm empty fruit fibre
CN101748634A (en) * 2009-12-16 2010-06-23 陕西科技大学 Improved APMP pulping method
CN102535236A (en) * 2012-02-06 2012-07-04 天津科技大学 Deciduous wood P-RC APMP (pre-conditioning refiner chemical pretreatment alkaline peroxide mechanical pulp) pulping process using magnesium alkali

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890888A (en) * 1992-12-23 1999-04-06 F. L. Smidth & Co. A/S Method and cooler for cooling particulate material
CN1587502A (en) * 2004-09-14 2005-03-02 天津科技大学 New process for producing alkaline hydrogen peroxide mechanical pulp by double scrwe extruding method
CN101046072A (en) * 2006-03-28 2007-10-03 天津科技大学 Pre-treatment process for producing bleached slurry with cotton stalk material
CN101319470A (en) * 2008-07-01 2008-12-10 李�昊 Improved APMP pulping method
CN101492891A (en) * 2009-03-11 2009-07-29 陕西科技大学 Method for producing and bleaching slasher sizing with oil windmill palm empty fruit fibre
CN101748634A (en) * 2009-12-16 2010-06-23 陕西科技大学 Improved APMP pulping method
CN102535236A (en) * 2012-02-06 2012-07-04 天津科技大学 Deciduous wood P-RC APMP (pre-conditioning refiner chemical pretreatment alkaline peroxide mechanical pulp) pulping process using magnesium alkali

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