CN110820403A - PRC-APMP pulping method of bamboo willow - Google Patents
PRC-APMP pulping method of bamboo willow Download PDFInfo
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- CN110820403A CN110820403A CN201810897841.5A CN201810897841A CN110820403A CN 110820403 A CN110820403 A CN 110820403A CN 201810897841 A CN201810897841 A CN 201810897841A CN 110820403 A CN110820403 A CN 110820403A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
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- 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
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- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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Abstract
The invention discloses a PRC-APMP pulping method of bamboo willow, which adopts the bamboo willow as a fiber raw material and comprises the following steps of adding 1 section of extruded wood chips into a 1 section of presoaking device, adding 1 section of presoaking liquid, 2 sections of extrusion defibering, 2 sections of chemical liquid presoaking, 1 section of disc grinder high-concentration pulp grinding, cyclone separation, cooling spiral cooling, high-concentration bleaching, dewatering by a dewatering squeezer, 2 sections of high-concentration pulp grinding, cyclone separation, latency elimination, double-disc pulp grinding, pressure screen and multi-disc concentration to prepare finished pulp. The PRC-APMP pulping method of the bamboo willow effectively widens the raw material resources of the chemi-mechanical pulp, optimizes the pulping process flow according to the difference of the wood properties of the bamboo willow and the poplar, has lower pulping cost and better pulp quality, and has the benefit of saving wood resources and environmental protection.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a PRC-APMP pulping method of bamboo willow.
Background
At present, PRC-APMP pulping raw materials are mainly poplar wood chips, and the used wood species are single. Due to the good processing performance of the poplar, the poplar becomes the raw wood material which is consumed the most in the plate industry in China, the purchase of the poplar fiber raw material is comprehensive competition in the industry and among the industries, and the supply requirement of the poplar raw material is difficult to meet at present. Bamboo willow is a multi-element hybridization rapid new tree species which is cultivated by the united research of the American California agricultural university and a plurality of large paper industry and seedling companies, and the bamboo willow is planted in large area in China. The tree species has the characteristics of fine wood structure, high natural whiteness, soft fiber, high heat value and the like, has potential excellent quality of pulping and papermaking materials, but has not been utilized in the papermaking industry to produce chemi-mechanical pulp.
Disclosure of Invention
The invention aims to provide a PRC-APMP pulping method of bamboo willows, which effectively widens the raw material resources of chemi-mechanical pulp, optimizes the pulping process flow according to the difference of the properties of the bamboo willows and poplar wood, has lower pulping cost and better pulp quality, and has the benefits of saving wood resources and protecting environment.
In order to realize the purpose, the invention adopts the technical scheme that: a PRC-APMP pulping method of bamboo willow is characterized in that the bamboo willow is adopted as a fiber raw material, and the method comprises the following steps of adding 1 section of extruded wood chips into a 1 section of presoaking device, adding 1 section of presoaking liquid, 2 sections of extrusion defibering, 2 sections of chemical liquid presoaking, 1 section of disc grinder high-concentration pulp grinding, cyclone separation, cooling spiral cooling, high-concentration bleaching, dehydration by a dewatering press, 2 sections of high-concentration pulp grinding, cyclone separation, latency elimination, double-disc pulp grinding, a pressure screen and multi-disc concentration to prepare finished pulp; the pre-immersion liquid at the 1 section adopts mixed liquid of NaOH, Mg (OH)2 and Na2SiO 3; in the 2-stage chemical liquid, the dosage of NaOH to the oven-dry pulp is 2.0-3.5%, the dosage of H2O2 to the oven-dry pulp is 1.0-3.0%, the dosage of Na2SiO3 to the oven-dry pulp is 1.0-2.0%, and the dosage of MgSO4 to the oven-dry pulp is 0-0.5%.
Preferably, the bamboo willow is characterized in that: the length of the wood chip is 19-25 mm, the thickness is 4.0 +/-1 mm, the qualification rate of the wood chip is not less than 75% (mass percent), the bark rate is not less than 0.5%, and the water content of the wood chip is not less than 38%.
Preferably, the 1-section disc mill blow-off pipe and the cooling screw at the upper part of the high-concentration tower are the addition points of the bleaching liquor, and the dosage of NaOH to the oven dry pulp is as follows: 1.0-1.8%, Mg (OH)2 for the dosage of oven dry pulp 0.3-1.0%, H2O2 for the dosage of oven dry pulp: 1.5-4.5%, the dosage of Na2SiO3 to oven-dried pulp: 1.0-3.0%; bleaching concentration: 20-35%, bleaching temperature: bleaching at 80-95 ℃ for: 60-90 min.
Preferably, the pre-immersion liquid at the 1 section adopts high-concentration bleaching waste liquid, wherein the liquid level is 10-15%, the dosage of NaOH to absolute dry pulp is 0-0.05%, the material level of a reaction bin of the pre-immersion device at the 1 section is 40-70%, and the exhaust temperature is 50-90 ℃.
Preferably, a disulfonic acid group liquid whitening agent is added at the inlet of the cooling screw, and the using amount of the disulfonic acid group liquid whitening agent is 1-3.5 kg/t of oven-dried slurry.
Preferably, the process conditions include: (A)1 log sheet extruder (MSD): the speed is not less than 55rpm, the torque is 50-100kN.m, the power is 400-800kw, and the torque control is prior; (B) 2 segment wood chip extruder (MSD): the speed is not less than 55rpm, the torque is 48-95kN.m, the power is 400-800kw, and the torque control is prior; (C) the double-disc mill has the milling concentration of 4.5-5.5%, the milling power of 500-1400 kw, the unit energy consumption of 25-120 kw/admt, the mill inlet pressure of 1.0-1.8 bar, the mill outlet pressure of 2.6-4.6 bar, and the pressure difference between the front and the back of the mill outlet pressure regulating valve of 0.1-0.5 bar; (F) the operating conditions of the 1-3 # pressure screen are as follows: the screen gap of the pressure screen is 0.15-0.2 mm, and the pulp inlet concentration is 1.2-2%; the pulp inlet pressure is 2.0-4.0 bar; the pressure difference between the inlet and the outlet (P outlet-P inlet) is not more than 50 kPa; the flow ratio of the slag pulp to the fine pulp is 25-40%; the operation load is 40-85%; the ratio of the good pulp flow rate of the 2-section/1-section pressure screen is 25-40%.
The invention has the beneficial effects that: according to the characteristics of bamboo willow, the consumption of chemicals is reduced, and the wastewater treatment load of the system is reduced; not only ensures the bleaching effect, but also reduces the bleaching loss and increases the bulk of the pulp;
1. meanwhile, in process control, the speed of a screw machine and a wood chip extruder (MSD) can be correspondingly improved by 2-13%, so that the production efficiency is improved;
2. compared with other fiber raw materials, the bamboo willow wood has a fine structure and high natural whiteness, so high-concentration bleaching wastewater can be adopted in the first pre-soaking section, bleaching residual hydrogen peroxide is utilized, the hydrogen peroxide addition in the section is cancelled, and the cost is saved;
3. in order to reduce the consumption of hydrogen peroxide, adding a disulfonic acid whitening agent into a cooling screw, and reducing the amount of alkali used for high-concentration bleaching and the amount of hydrogen peroxide, wherein the amount of the disulfonic acid whitening agent is 1-3.5 kg/t of absolute dry pulp;
4. the bulk of the pulp is improved, the bleaching alkali source adopts the combination of magnesium alkali and sodium alkali, and the dosage of NaOH to the oven-dried pulp is as follows: 1.0-1.8%, and Mg (OH)2 is 0.3-1.0% of oven dry pulp.
Detailed Description
The present invention is described in detail below for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the description of the present invention is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Example 1:
the bamboo willow is peeled, sliced and screened, and then is sent to production for use. The high-concentration bleaching waste liquid is conveyed to the 1-section pre-dipping process for use through a pipeline. Because the solubility of the magnesium alkali is poor, a stirring device is arranged in a magnesium alkali tank, and the magnesium alkali tank is pumped to a system to be used with the sodium alkali. (1) The pulping fiber raw material is characterized in that: 100% of bamboo willow, 19-25 mm of wood chip length, 4.0 +/-1 mm of thickness, 75% of qualified rate of the wood chip (mass percentage), 0.5% of bark rate and 38% of water content of the wood chip. (2) The production process flow is briefly described as follows: the preparation of the materials comes from wood chips → 1 section of pre-steaming bin → wood chips washing → 2 section of pre-steaming bin → 1 section of extrusion → 1 section of pre-soaking device (1 section of pre-soaking liquid medicine is added) → 2 section of extrusion → 2 section of pre-soaking device (2 section of pre-soaking liquid medicine is added) → 1 section of grinding (bleaching liquid medicine adding point) → 1 section of cyclone separator → cooling screw (whitening agent adding point) → high concentration bleaching tower → 1 section of dehydration and concentration machine → 2 section of grinding → latent eliminating pool → double disc grinding → middle pool → pressure sieve → good pulp pool → multi-disc → medium concentration pulp storage tower (pH 7-7.5 is adjusted by sulfuric acid). (3) The main production process technical conditions are as follows: the process conditions comprise: (A)1 log sheet extruder (MSD): the speed is not less than 55rpm, the torque is 50-100kN.m, the power is 400-800kw, and the torque control is prior; 1 section of prepreg: 10-15% of liquid level, 0-0.05% of NaOH on the oven-dry pulp, 40-70% of material level of a 1-stage reaction bin and 50-90% of steam exhaust temperature; (B) 2 segment wood chip extruder (MSD): the speed is not less than 55rpm, the torque is 48-95kN.m, the power is 400-800kw, and the torque control is prior; 2, a section of prepreg: 10-15% of liquid level, 2.0-3.5% of NaOH for the oven-dry pulp, 1.0-3.0% of H2O2 for the oven-dry pulp, 1.0-2.0% of Na2SiO3 for the oven-dry pulp, 0-0.5% of MgSO4 for the oven-dry pulp, 30-70% of 2-stage reaction bin, and 60-95% of steam exhaust temperature; (C) bleaching: the liquid medicine adding point is 1 section of disc mill blow-off pipe and cooling screw on the upper part of the high concentration tower, and the dosage of NaOH to the oven dry pulp is as follows: 1.0-1.8%, Mg (OH)2 for the dosage of oven dry pulp 0.3-1.0%, H2O2 for the dosage of oven dry pulp: 1.5-4.5%, the dosage of Na2SiO3 to oven-dried pulp: 1.0-3.0%, bleaching concentration: 20-35%, bleaching temperature: bleaching at 80-95 ℃ for: 60-90 min; (D) adding a disulfonic acid group liquid whitening agent at a cooling spiral inlet, wherein the dosage of the disulfonic acid group liquid whitening agent is 1-3.5 kg/t of oven dry slurry; (E) the double-disc mill has the milling concentration of 4.5-5.5%, the milling power of 500-1400 kw, the unit energy consumption of 25-120 kw/admt, the mill inlet pressure of 1.0-1.8 bar, the mill outlet pressure of 2.6-4.6 bar, and the pressure difference between the front and the back of the mill outlet pressure regulating valve of 0.1-0.5 bar; (F) the operating conditions of the 1-3 # pressure screen are as follows: the screen gap of the pressure screen is 0.15-0.2 mm, and the pulp inlet concentration is 1.2-2%; the pulp inlet pressure is 2.0-4.0 bar; the pressure difference between the inlet and the outlet (P outlet-P inlet) is not more than 50 kPa; the flow ratio of the slag pulp to the fine pulp is 25-40%; the operation load is 40-85%; the ratio of the good pulp flow rate of the 2-section/1-section pressure screen is 25-40%. (4) Quality characteristics of the bleached pulp: the slurry has the whiteness of 80-85% ISO, the freeness of 150-250 ml, the tensile index of 38-48 N.m/g, the bulk of 2.8-3.4, the light scattering coefficient of 43-48 m2/kg, the light absorption coefficient of 0.78-1.0 m2/kg, the dust degree of 40-100 mm2/kg and the fiber bundle content of 0-0.2%.
Example 2 is characterized in that the bamboo willow wood structure is fine compared with example 1, and in order to improve the bleaching effect of the 2-stage presoaking liquid and the homogenizing and dispersing effect of the 1-stage disc mill, the calcium hydroxide solution is added into the 2-stage presoaking liquid for the dosage of oven dry pulp: 1.0 to 1.2 percent.
Example 3 is characterized in that calcium oxide powder is added to 2 stages of the prepreg solution, and the dosage of the absolute dry slurry is as follows: 0.5 to 0.8 percent.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (6)
1. A PRC-APMP pulping method of bamboo willow is characterized in that the bamboo willow is adopted as a fiber raw material, and the method comprises the following steps of adding 1 section of extruded wood chips into a 1 section of presoaking device, adding 1 section of presoaking liquid, 2 sections of extrusion defibering, 2 sections of chemical liquid presoaking, 1 section of disc grinder high-concentration pulp grinding, cyclone separation, cooling spiral cooling, high-concentration bleaching, dehydration by a dewatering press, 2 sections of high-concentration pulp grinding, cyclone separation, latency elimination, double-disc pulp grinding, a pressure screen and multi-disc concentration to prepare finished pulp; the pre-immersion liquid at the 1 section adopts mixed liquid of NaOH, Mg (OH)2 and Na2SiO 3; in the 2-stage chemical liquid, the dosage of NaOH to the oven-dry pulp is 2.0-3.5%, the dosage of H2O2 to the oven-dry pulp is 1.0-3.0%, the dosage of Na2SiO3 to the oven-dry pulp is 1.0-2.0%, and the dosage of MgSO4 to the oven-dry pulp is 0-0.5%.
2. The PRC-APMP pulping method of bamboo willows according to claim 1, characterized in that the adopted bamboo willows are characterized in that: the length of the wood chip is 19-25 mm, the thickness is 4.0 +/-1 mm, the qualification rate of the wood chip is not less than 75% (mass percent), the bark rate is not less than 0.5%, and the water content of the wood chip is not less than 38%.
3. The PRC-APMP pulping method of bamboo willows according to claim 1, wherein a 1-section disc mill blowing pipe and a cooling screw at the upper part of a high concentration tower are the addition points of bleaching liquid, and the dosage of NaOH to oven dry pulp is as follows: 1.0-1.8%, Mg (OH)2 for the dosage of oven dry pulp 0.3-1.0%, H2O2 for the dosage of oven dry pulp: 1.5-4.5%, the dosage of Na2SiO3 to oven-dried pulp: 1.0-3.0%; bleaching concentration: 20-35%, bleaching temperature: bleaching at 80-95 ℃ for: 60-90 min.
4. The PRC-APMP pulping method of bamboo willows according to claim 3, characterized in that the pre-immersion liquid in the 1 section adopts high-concentration bleaching waste liquid, wherein the liquid level is 10-15%, the amount of NaOH to absolute dry pulp is 0-0.05%, the material level of a reaction bin of the pre-immersion device in the 1 section is 40-70%, and the steam exhaust temperature is 50-90 ℃.
5. The PRC-APMP pulping method of bamboo willows according to claim 1, characterized in that a disulfonic acid group liquid whitening agent is added at a cooling spiral inlet, and the dosage is 1-3.5 kg/t of oven dry pulp.
6. The PRC-APMP pulping method of bamboo willows according to claim 1, characterized in that the process conditions include: (A)1 log sheet extruder (MSD): the speed is not less than 55rpm, the torque is 50-100kN.m, the power is 400-800kw, and the torque control is prior; (B) 2 segment wood chip extruder (MSD): the speed is not less than 55rpm, the torque is 48-95kN.m, the power is 400-800kw, and the torque control is prior; (C) the double-disc mill has the milling concentration of 4.5-5.5%, the milling power of 500-1400 kw, the unit energy consumption of 25-120 kw/admt, the mill inlet pressure of 1.0-1.8 bar, the mill outlet pressure of 2.6-4.6 bar, and the pressure difference between the front and the back of the mill outlet pressure regulating valve of 0.1-0.5 bar; (F) the operating conditions of the 1-3 # pressure screen are as follows: the screen gap of the pressure screen is 0.15-0.2 mm, and the pulp inlet concentration is 1.2-2%; the pulp inlet pressure is 2.0-4.0 bar; the pressure difference between the inlet and the outlet (P outlet-P inlet) is not more than 50 kPa; the flow ratio of the slag pulp to the fine pulp is 25-40%; the operation load is 40-85%; the ratio of the good pulp flow rate of the 2-section/1-section pressure screen is 25-40%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810897841.5A CN110820403A (en) | 2018-08-08 | 2018-08-08 | PRC-APMP pulping method of bamboo willow |
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| CN201810897841.5A CN110820403A (en) | 2018-08-08 | 2018-08-08 | PRC-APMP pulping method of bamboo willow |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176750A (en) * | 2020-10-09 | 2021-01-05 | 岳阳林纸股份有限公司 | P-RC APMP pulping method for hardwood mixed wood |
| CN115262269A (en) * | 2022-07-08 | 2022-11-01 | 宜宾纸业股份有限公司 | Refined bamboo pulp, preparation method thereof and application of refined bamboo pulp in papermaking |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0113353A1 (en) * | 1982-02-16 | 1984-07-18 | Sunds Defibrator | Method and apparatus for producing fibre pulp from fibrous lignocellulose containing material. |
| CN104372704A (en) * | 2014-09-15 | 2015-02-25 | 岳阳林纸股份有限公司 | Chemical-mechanical pulp H2O2+OBA relay axurilary bleaching method |
| CN105178075A (en) * | 2015-09-18 | 2015-12-23 | 岳阳林纸股份有限公司 | Application of efficient penetrating agent in high-yield pulp making |
| CN108071041A (en) * | 2017-12-21 | 2018-05-25 | 岳阳林纸股份有限公司 | A kind of preparation method of mixing material bleaching reducing rules |
-
2018
- 2018-08-08 CN CN201810897841.5A patent/CN110820403A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0113353A1 (en) * | 1982-02-16 | 1984-07-18 | Sunds Defibrator | Method and apparatus for producing fibre pulp from fibrous lignocellulose containing material. |
| CN104372704A (en) * | 2014-09-15 | 2015-02-25 | 岳阳林纸股份有限公司 | Chemical-mechanical pulp H2O2+OBA relay axurilary bleaching method |
| CN105178075A (en) * | 2015-09-18 | 2015-12-23 | 岳阳林纸股份有限公司 | Application of efficient penetrating agent in high-yield pulp making |
| CN108071041A (en) * | 2017-12-21 | 2018-05-25 | 岳阳林纸股份有限公司 | A kind of preparation method of mixing material bleaching reducing rules |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112176750A (en) * | 2020-10-09 | 2021-01-05 | 岳阳林纸股份有限公司 | P-RC APMP pulping method for hardwood mixed wood |
| CN115262269A (en) * | 2022-07-08 | 2022-11-01 | 宜宾纸业股份有限公司 | Refined bamboo pulp, preparation method thereof and application of refined bamboo pulp in papermaking |
| CN115262269B (en) * | 2022-07-08 | 2023-08-11 | 宜宾纸业股份有限公司 | Refined bamboo pulp, preparation method thereof and application of refined bamboo pulp in papermaking |
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