CN104594089A - Chemi-mechanical pulp preparing method and device - Google Patents
Chemi-mechanical pulp preparing method and device Download PDFInfo
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- CN104594089A CN104594089A CN201410812080.0A CN201410812080A CN104594089A CN 104594089 A CN104594089 A CN 104594089A CN 201410812080 A CN201410812080 A CN 201410812080A CN 104594089 A CN104594089 A CN 104594089A
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- alkali
- preg
- hard material
- preimpregnation
- proportion
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- 238000000034 method Methods 0.000 title claims abstract description 97
- 229920001131 Pulp (paper) Polymers 0.000 title abstract 3
- 239000003513 alkali Substances 0.000 claims abstract description 154
- 239000000463 material Substances 0.000 claims abstract description 74
- 238000004061 bleaching Methods 0.000 claims abstract description 59
- 238000011084 recovery Methods 0.000 claims abstract description 47
- 239000000126 substance Substances 0.000 claims abstract description 45
- 230000007246 mechanism Effects 0.000 claims description 103
- 238000002360 preparation method Methods 0.000 claims description 31
- 239000002023 wood Substances 0.000 claims description 24
- 244000166124 Eucalyptus globulus Species 0.000 claims description 10
- 235000010643 Leucaena leucocephala Nutrition 0.000 claims description 10
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 10
- 241000018646 Pinus brutia Species 0.000 claims description 10
- 235000011613 Pinus brutia Nutrition 0.000 claims description 10
- 240000007472 Leucaena leucocephala Species 0.000 claims 1
- 238000004537 pulping Methods 0.000 abstract description 13
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 241000220479 Acacia Species 0.000 description 9
- 239000002002 slurry Substances 0.000 description 6
- 241001343274 Dichrostachys spicata Species 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 238000009993 causticizing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Paper (AREA)
Abstract
The invention discloses a chemi-mechanical pulp preparing method. The method comprises the following steps of presoaking hard materials, adding chemical alkali with the proportion of recovery alkali larger than 50% in a presoaking process, bleaching the presoaked materials, and adding chemical alkali with the proportion of commercial alkali larger than 50% in a bleaching process. The invention further discloses a chemi-mechanical pulp preparing device. By means of changing the using proportion of the presoaking section and the using proportion of the bleaching section in a pulping process, the pulp brightness is guaranteed, and most generated recovery alkali can be timely consumed away. Thus, the synchronous continuous operation of a pulp line and a recycling work section is achieved, and the pulping cost is reduced.
Description
Technical field
The present invention relates to a kind of preparation method and device thereof of reducing rules.
Background technology
Need in the preparation process of reducing rules to use multiple alkaline chemical, in the waste water of generation, alkali content is higher, can not directly discharge, in order to waste water recycling device can be reclaimed alkali to obtain by head it off industry usually.Reclaim the recovery alkali obtained to be used for Substitute For Partial commercially available alkali and to use as the raw material of pulping section, not only environmental protection but also save consumptive material.
In order to ensure that slurry line carries out smoothly, the recovery alkali that Sewage treatment workshop section produces at least will consume more than 70% in pulping section.But when recovery alkali is when pulping section usage ratio is more than 50%, the whiteness of pulping just cannot maintain more than 75%ISO, and need extra other auxiliary chemicals of interpolation, this causes slurrying cost higher.
Summary of the invention
The technical problem that the present invention mainly solves is to provide and a kind ofly ensures into preparation method and the device that major part that pulp brightness can also consume generation in time simultaneously reclaims the reducing rules of alkali, can reduce slurrying cost.
For solving the problems of the technologies described above, the invention provides a kind of preparation method of reducing rules, it comprises the steps: to carry out pre-preg to hard material, and the chemicals alkali that the proportion adding recovery alkali in described pre-preg process is greater than 50%; Bleaching is carried out to the material obtained after carrying out described preimpregnation, and the chemicals alkali that the proportion adding commercially available alkali in described bleaching process is greater than 50%.
Wherein, pre-preg is being carried out to hard material, and the proportion adding recovery alkali in described pre-preg process is greater than in the step of chemicals alkali of 50%, described pre-preg comprises one section of pre-preg and two sections of pre-preg, and the chemicals alkali that the proportion adding recovery alkali respectively in described one section of pre-preg and described two sections of pre-preg processes is greater than 50%.
Wherein, in described one section of pre-preg and described two sections of pre-preg processes, add the proportion reclaiming alkali be respectively greater than in the step of chemicals alkali of 50%, the interpolation proportion of described recovery alkali is respectively 100%.
Wherein, carry out bleaching to the material obtained after carrying out described preimpregnation, and the proportion adding commercially available alkali in described bleaching process is greater than in the step of chemicals alkali of 50%, the interpolation proportion of described commercially available alkali accounts for 100%.
Wherein, in described one section of pre-preg process, the addition of described recovery alkali is 20kg/adt ~ 22kg/adt, in described two sections of pre-preg processes, the addition of described recovery alkali is 9kg/adt ~ 11kg/adt, in described bleaching process, the addition of described commercially available alkali is 15kg/adt ~ 17kg/adt.
Wherein, before the step of described hard material being carried out to one section of pre-preg and two sections of pre-preg, comprise respectively and process is torn to described hard material extruding.
Wherein, describedly tearing in the step of process to the extruding of described hard material, adopt wood chip shredder to carry out extruding to described hard material and tear process, wherein before described hard material carries out one section of pre-preg, the wood chip shredder adopting moment of torsion to be at least 155kN.m carries out extruding to described hard material and tears process; The hard material that extruding was torn is after one section of pre-preg, and before entering two sections of pre-preg, the wood chip shredder adopting moment of torsion to be at least 145kN.m again carries out extruding to described hard material and tears process.
Wherein, described hard material is the mixed wood comprising Acacia, pine and Eucalyptus.
For solving the problems of the technologies described above, present invention also offers a kind of preparation facilities of reducing rules, it comprises: input mechanism, for inputting hard material; Preimpregnation mechanism, for described hard material pre-preg; Bleaching mechanism, for carrying out bleaching to the material obtained after preimpregnation; Batch charging mechanism, the chemicals alkali that the proportion for adding recovery alkali to described preimpregnation mechanism is greater than 50%, and the chemicals alkali that the proportion adding commercially available alkali in described bleaching mechanism is greater than 50%.
Wherein, described preimpregnation mechanism comprises one section of preimpregnation mechanism and two sections of preimpregnation mechanisms, the chemicals alkali that described batch charging mechanism is greater than 50% respectively to the proportion adding recovery alkali in one section of preimpregnation mechanism and two sections of preimpregnation mechanisms.
Wherein, described preparation facilities also comprises preliminary treatment mechanism, and described preliminary treatment mechanism is used for tearing process to the extruding of described hard material, through the pretreated hard material of preliminary treatment mechanism as the material entering described preimpregnation mechanism.
The invention has the beneficial effects as follows: the situation being different from prior art, the present invention is by the preimpregnation section of change in pulping process and the usage ratio of bleaching section, namely the consumption reclaiming alkali is promoted in preimpregnation section, the consumption of commercially available alkali is promoted in bleaching section, the major part that can also consume generation ensureing into pulp brightness while in time reclaims alkali, guarantee slurry line, recycle section synchronously run continuously, reduce slurrying cost.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of first embodiment of the preparation method of reducing rules of the present invention.
Fig. 2 is the schematic flow sheet of second embodiment of the preparation method of reducing rules of the present invention.
Fig. 3 is the structural representation of the first embodiment of the preparation facilities of reducing rules of the present invention.
Fig. 4 is the structural representation of the second embodiment of the preparation facilities of reducing rules of the present invention.
main element symbol description
Preparation facilities 100,200
Input mechanism 110,210
Preliminary treatment mechanism 220
First preliminary treatment mechanism 222
Second preliminary treatment mechanism 224
Preimpregnation mechanism 130,230
One section of preimpregnation mechanism 132,232
Two sections of preimpregnation mechanisms 134,234
Bleaching mechanism 140,240
Batch charging mechanism 150,250
Detailed description of the invention
Below in conjunction with drawings and embodiments, the present invention is described in detail.
Consult Fig. 1, first embodiment of the preparation method of reducing rules of the present invention, comprises the steps:
Step S110: pre-preg is carried out to hard material, and the chemicals alkali that the proportion adding recovery alkali in described pre-preg process is greater than 50%.
Described hard material is the raw material preparing reducing rules of the present invention.Described hard material is one or more in needlebush and leaf wood.
Described pre-preg refers to the processing procedure being added into by preimpregnation chemicals and also carrying out with it in described hard material soaking.Wherein, the preimpregnation chemicals usually added is chemicals alkali, and this chemicals alkali generally includes the mixed base reclaiming alkali and commercially available alkali.Wherein said recovery alkali to refer to after the Waste water concentrating process produced in pulping process again through alkali that nitre causticizing reaction obtains.
At present, what usually adopt in prior art is in pre-preg process, add proportion respectively account for the recovery alkali of 50% and the chemicals alkali of commercially available alkali.And in first embodiment of the invention, be the chemicals alkali that the proportion adding recovery alkali in described pre-preg process is greater than 50%.
Step S120: bleaching is carried out to the material obtained after carrying out described preimpregnation, and the chemicals alkali that the proportion adding commercially available alkali in described bleaching process is greater than 50%.
Described hard material after pre-preg carries out bleaching.Because bleaching section is comparatively large on pulp brightness impact, the proportion adding commercially available alkali in bleaching process is greater than the chemicals alkali of 50%, more thorough to the bleaching of slurry.
The present embodiment passes through the preimpregnation section of change in pulping process and bleaches the adding proportion reclaiming alkali and commercially available alkali in section, namely promoting in preimpregnation section the consumption reclaiming alkali makes the proportion of recovery alkali be greater than 50%, the consumption promoting commercially available alkali in bleaching section makes the proportion of commercially available alkali be greater than 50%, the major part that can also consume generation ensureing into pulp brightness while in time reclaims alkali, guarantee slurry line, recycle section synchronously run continuously, reduce slurrying cost.
Consult Fig. 2, second embodiment of the preparation method of reducing rules of the present invention, comprises the steps:
Step S210: one section of pre-preg is carried out to hard material, and the chemicals alkali adding that in described one section of pre-preg process the proportion reclaiming alkali is 100%.
Described hard material is one or more in needlebush and leaf wood, such as can adopt in Acacia, pine and Eucalyptus one or more, the present embodiment adopts the mixed wood comprising Acacia, pine and Eucalyptus, wherein Acacia: pine: the proportioning of Eucalyptus is in the scope of 60-80:10-30:0-10.
The interpolation proportion reclaiming alkali described in described one section of pre-preg process is 100%, and the addition of described recovery alkali is 20kg/adt ~ 22kg/adt.
Step S220: the material after one section of pre-preg carries out two sections of pre-preg, and the chemicals alkali adding that in described two sections of pre-preg processes the proportion reclaiming alkali is 100%.
Described hard material after described one section of pre-preg carries out two sections of pre-preg again, and the interpolation proportion reclaiming alkali described in described two sections of pre-preg processes is 100%, and the addition of described recovery alkali is 9kg/adt ~ 11kg/adt.
Described one section of pre-preg in the present embodiment and described two sections of pre-preg can adopt two sections of pre-preg techniques in the reducing rules pulping process of Austrian Andritz Stock Corporation.
Step S230: bleaching is carried out to the material obtained after carrying out described two sections of pre-preg, and the proportion adding commercially available alkali in described bleaching process is the chemicals alkali of 100%.
Described in described bleaching process, the interpolation proportion of commercially available alkali accounts for 100%.The addition of described commercially available alkali is 15kg/adt ~ 17kg/adt.
The present embodiment passes through the preimpregnation section of change in pulping process and bleaches the mode reclaiming the adding proportion of alkali and commercially available alkali in section, namely add separately in pre-preg process and reclaim alkali, commercially available alkali is added separately in bleaching process, ensure that the consumption reclaiming alkali, guarantee that slurry line, recycle section synchronously run continuously, and recovery alkali is easily filtered off in pre-preg process, less on pulp brightness impact, guarantee into pulp brightness.
Understandable, described hard material, before pre-preg, also comprises and tears process to the extruding of described hard material, make the structure of wood chip become loose expansion, increase follow-up in pre-preg process with the contact area of the chemicals alkali added.
For the pulping process of the second embodiment, before the step of described hard material being carried out to one section of pre-preg and two sections of pre-preg, also comprise respectively and adopt wood chip shredder to tear process to described hard material extruding.Concrete, first adopt wood chip shredder to carry out extruding to described hard material and tear process, the moment of torsion of described wood chip shredder is at least 155kN.m; Then, carrying out one section of pre-preg through extruding the hard material torn, in described one section of pre-preg process, adding the chemicals alkali that the proportion reclaiming alkali is 100%; Then, the hard material after one section of pre-preg tears process through the extruding of wood chip shredder again, and now the moment of torsion of described wood chip shredder is set to be at least 155kN.m; Finally, the hard material torn through secondary extrusion carries out two sections of pre-preg, adds the chemicals alkali that the proportion reclaiming alkali is 100% in described two sections of pre-preg processes.
Understandable, pre-preg of the present invention is not limited to the two sections of pre-preg adopted as in the second embodiment, and described pre-preg only can adopt one section of pre-preg in other embodiments, also can adopt three sections of pre-preg.
Understandable, the proportion of the commercially available alkali of the interpolation in other embodiments of the present invention in the proportion of the recovery alkali of described pre-preg process interpolation and bleaching process is not limited to the scope of the first embodiment.As long as the scope that the recovery alkali added respectively in pre-preg and bleaching and the proportion of commercially available alkali are greater than 50%, such as, the chemicals alkali that the proportion adding recovery alkali in described pre-preg process is greater than 60%, the proportion adding commercially available alkali in described bleaching process is greater than the chemicals alkali of 60%; Or the chemicals alkali that the proportion adding recovery alkali in described pre-preg process is greater than 85%, the proportion adding commercially available alkali in described bleaching process is greater than the chemicals alkali of 85%; Or in described pre-preg process, adding the chemicals alkali reclaiming the proportion of alkali and be greater than 95%, the chemicals alkali etc. that the proportion adding commercially available alkali in described bleaching process is greater than 95% all can.
Refer to Fig. 3, the preparation facilities 100 of the reducing rules of first embodiment of the invention, comprise input mechanism 110, preimpregnation mechanism 130, bleaching mechanism 140 and batch charging mechanism 150.
Described input mechanism 110 is for inputting hard material.Described hard material is one or more in needlebush and leaf wood, such as can adopt in Acacia, pine and Eucalyptus one or more, the mixed wood comprising Acacia, pine and Eucalyptus is adopted, wherein Acacia: pine: the proportioning of Eucalyptus is in the scope of 60-80:10-30:0-10 in the present embodiment.。
Described preimpregnation mechanism 130 is for described hard material pre-preg.
In the present embodiment, described preimpregnation mechanism 130 comprises one section of preimpregnation mechanism 132 and two sections of preimpregnation mechanisms 134.Described one section of preimpregnation mechanism 132 is for carrying out one section of pre-preg to described hard material, and described two sections of preimpregnation mechanisms 134 are for carrying out two sections of pre-preg again to the material after one section of pre-preg.
Understandable, according to different pre-preg technique, in other embodiments, described preimpregnation mechanism also can be and only includes one section of preimpregnation mechanism, also can comprise one section, two sections and three sections of preimpregnation mechanisms.
Described bleaching mechanism 140 is for carrying out bleaching to the material obtained after preimpregnation.
The chemicals alkali that described batch charging mechanism 150 is greater than 50% for the proportion adding recovery alkali to described preimpregnation mechanism 130, and the chemicals alkali that the proportion adding commercially available alkali in described bleaching mechanism 140 is greater than 50%.
Refer to Fig. 4, the preparation facilities 200 of the reducing rules of second embodiment of the invention, comprise input mechanism 210, preliminary treatment mechanism 220, preimpregnation mechanism 230, bleaching mechanism 240 and batch charging mechanism 250.
Input mechanism 210 in preparation facilities 200 in the present embodiment, preimpregnation mechanism 230, the input mechanism 110 of the preparation facilities 100 of the reducing rules that bleaching mechanism 240 and batch charging mechanism 250 provide with the first embodiment respectively, preimpregnation mechanism 130, bleaching mechanism 140 and batch charging mechanism 150 roughly the same, unlike, described preparation facilities 200 in the present embodiment also comprises preliminary treatment mechanism 220, described preliminary treatment mechanism 220 is for tearing process to described hard material extruding, through the pretreated hard material of preliminary treatment mechanism 220 as the material entering described preimpregnation mechanism 230.When described pre-preg adopts two sections of preimpregnated processes, this preliminary treatment mechanism 220 can comprise the first preliminary treatment mechanism 222 and the second preliminary treatment mechanism 224, before being separately positioned on described one section of preimpregnation mechanism 232 and before described two sections of preimpregnation mechanisms 234.
Below by specific embodiment, the present invention is further described.
Embodiment one:
Input mechanism bull ladle containing the mixed wood of Acacia, pine and Eucalyptus, wherein Acacia: pine: the proportioning of Eucalyptus is 70:20:10.
One section of preliminary treatment mechanism, as wood chip shredder to as described in hard material carry out extruding and tear process.The moment of torsion of wherein said wood chip shredder is set to 155kN.m.
Extrude in one section of preimpregnation mechanism that the hard material torn enters in preimpregnation mechanism through described preliminary treatment mechanism and carry out one section of pre-preg, in described one section of pre-preg process, described feeder adds the recovery alkali that proportion is 100% in described one section of preimpregnation mechanism, and the addition of described recovery alkali is 21kg/adt.
Hard material after one section of pre-preg is transported to two sections of preliminary treatment mechanisms again, and tear process as carried out extruding in wood chip shredder, the moment of torsion of wherein said wood chip shredder is set to 145kN.m.
The hard material exported from two sections of preliminary treatment mechanisms enters in two sections of preimpregnation mechanisms and carries out two sections of pre-preg, in described two sections of pre-preg processes, described feeder adds the recovery alkali that proportion is 100% in described two sections of preimpregnation mechanisms, and the addition of described recovery alkali is 10kg/adt.
Enter bleaching mechanism from the material of two sections of preimpregnation mechanisms outputs and carry out bleaching, in described bleaching process, described feeder adds the commercially available alkali that proportion is 100% in described bleaching mechanism, and the addition of described commercially available alkali is 16kg/adt.
Embodiment two:
The present embodiment is roughly the same with embodiment one, different with the proportion of commercially available alkali unlike the recovery alkali added in pre-preg with bleaching process.Concrete, in described one section of pre-preg process, described feeder adds the recovery alkali that proportion is 60% in described one section of preimpregnation mechanism; In described two sections of pre-preg processes, described feeder adds the recovery alkali that proportion is 60% in described two sections of preimpregnation mechanisms; In described bleaching process, described feeder adds the commercially available alkali that proportion is 60% in described bleaching mechanism.
Embodiment three:
The present embodiment is roughly the same with embodiment one, different with the proportion of commercially available alkali unlike the recovery alkali added in pre-preg with bleaching process.Concrete, in described one section of pre-preg process, described feeder adds the recovery alkali that proportion is 80% in described one section of preimpregnation mechanism; In described two sections of pre-preg processes, described feeder adds the recovery alkali that proportion is 80% in described two sections of preimpregnation mechanisms; In described bleaching process, described feeder adds the commercially available alkali that proportion is 80% in described bleaching mechanism.
Embodiment four:
The present embodiment is roughly the same with embodiment one, different with the proportion of commercially available alkali unlike the recovery alkali added in pre-preg with bleaching process.Concrete, in described one section of pre-preg process, described feeder adds the recovery alkali that proportion is 90% in described one section of preimpregnation mechanism; In described two sections of pre-preg processes, described feeder adds the recovery alkali that proportion is 90% in described two sections of preimpregnation mechanisms; In described bleaching process, described feeder adds the commercially available alkali that proportion is 90% in described bleaching mechanism.
The reducing rules obtained in above-described embodiment is carried out examination with computer, becomes that pulp brightness is all sustainable maintains more than 75%ISO.
Be different from the situation of prior art, the present invention passes through the preimpregnation section of change in pulping process and bleaches the adding proportion reclaiming alkali and commercially available alkali in section, namely the consumption reclaiming alkali is promoted in preimpregnation section, the consumption of commercially available alkali is promoted in bleaching section, the major part that can also consume generation ensureing into pulp brightness while in time reclaims alkali, guarantee slurry line, recycle section synchronously run continuously, reduce slurrying cost.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (11)
1. a preparation method for reducing rules, described method comprises:
Pre-preg is carried out to hard material, and the chemicals alkali that the proportion adding recovery alkali in described pre-preg process is greater than 50%;
Bleaching is carried out to the material obtained after carrying out described preimpregnation, and the chemicals alkali that the proportion adding commercially available alkali in described bleaching process is greater than 50%.
2. the preparation method of a kind of reducing rules as claimed in claim 1, it is characterized in that: pre-preg is being carried out to hard material, and the proportion adding recovery alkali in described pre-preg process is greater than in the step of chemicals alkali of 50%, described pre-preg comprises one section of pre-preg and two sections of pre-preg, and the chemicals alkali that the proportion adding recovery alkali respectively in described one section of pre-preg and described two sections of pre-preg processes is greater than 50%.
3. the preparation method of a kind of reducing rules as claimed in claim 2, it is characterized in that: in described one section of pre-preg and described two sections of pre-preg processes, add the proportion reclaiming alkali be respectively greater than in the step of chemicals alkali of 50%, the interpolation proportion of described recovery alkali is respectively 100%.
4. the preparation method of a kind of reducing rules as claimed in claim 3, it is characterized in that: bleaching is carried out to the material obtained after carrying out described preimpregnation, and the proportion adding commercially available alkali in described bleaching process is greater than in the step of chemicals alkali of 50%, the interpolation proportion of described commercially available alkali accounts for 100%.
5. the preparation method of a kind of reducing rules as claimed in claim 4, it is characterized in that: in described one section of pre-preg process, the addition of described recovery alkali is 20kg/adt ~ 22kg/adt, in described two sections of pre-preg processes, the addition of described recovery alkali is 9kg/adt ~ 11kg/adt, in described bleaching process, the addition of described commercially available alkali is 15kg/adt ~ 17kg/adt.
6. the preparation method of a kind of reducing rules as claimed in claim 2, is characterized in that: before the step of described hard material being carried out to one section of pre-preg and two sections of pre-preg, comprises respectively and tears process to described hard material extruding.
7. the preparation method of a kind of reducing rules as claimed in claim 5, it is characterized in that: describedly tearing in the step of process to the extruding of described hard material, adopt wood chip shredder to carry out extruding to described hard material and tear process, wherein before described hard material carries out one section of pre-preg, the wood chip shredder adopting moment of torsion to be at least 155kN.m carries out extruding to described hard material and tears process; The hard material that extruding was torn is after one section of pre-preg, and before entering two sections of pre-preg, the wood chip shredder adopting moment of torsion to be at least 145kN.m again carries out extruding to described hard material and tears process.
8. the preparation method of a kind of reducing rules as claimed in claim 1, is characterized in that: described hard material is the mixed wood comprising Acacia, pine and Eucalyptus.
9. a preparation facilities for reducing rules, it comprises:
Input mechanism, for inputting hard material;
Preimpregnation mechanism, for described hard material pre-preg;
Bleaching mechanism, for carrying out bleaching to the material obtained after preimpregnation;
Batch charging mechanism, the chemicals alkali that the proportion for adding recovery alkali to described preimpregnation mechanism is greater than 50%, and the chemicals alkali that the proportion adding commercially available alkali in described bleaching mechanism is greater than 50%.
10. the preparation facilities of a kind of reducing rules as claimed in claim 9, it is characterized in that: described preimpregnation mechanism comprises one section of preimpregnation mechanism and two sections of preimpregnation mechanisms, the chemicals alkali that described batch charging mechanism is greater than 50% respectively to the proportion adding recovery alkali in one section of preimpregnation mechanism and two sections of preimpregnation mechanisms.
The preparation facilities of 11. a kind of reducing rules as described in claim 9 or 10, it is characterized in that: described preparation facilities also comprises preliminary treatment mechanism, described preliminary treatment mechanism is used for tearing process to the extruding of described hard material, through the pretreated hard material of preliminary treatment mechanism as the material entering described preimpregnation mechanism.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139681A (en) * | 2019-12-26 | 2020-05-12 | 广西金桂浆纸业有限公司 | Chemi-mechanical pulp and manufacturing method thereof |
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