CN117604797A - Pulping method for three residues in agriculture and forestry - Google Patents
Pulping method for three residues in agriculture and forestry Download PDFInfo
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- CN117604797A CN117604797A CN202311591226.9A CN202311591226A CN117604797A CN 117604797 A CN117604797 A CN 117604797A CN 202311591226 A CN202311591226 A CN 202311591226A CN 117604797 A CN117604797 A CN 117604797A
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- 238000004537 pulping Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002023 wood Substances 0.000 claims abstract description 63
- 238000004061 bleaching Methods 0.000 claims abstract description 50
- 108090000790 Enzymes Proteins 0.000 claims abstract description 18
- 102000004190 Enzymes Human genes 0.000 claims abstract description 18
- 238000010025 steaming Methods 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 58
- 238000000227 grinding Methods 0.000 claims description 20
- 238000001125 extrusion Methods 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 238000005470 impregnation Methods 0.000 claims description 10
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 5
- 235000011613 Pinus brutia Nutrition 0.000 claims description 5
- 241000018646 Pinus brutia Species 0.000 claims description 5
- 108010029541 Laccase Proteins 0.000 claims description 4
- 102000004882 Lipase Human genes 0.000 claims description 4
- 108090001060 Lipase Proteins 0.000 claims description 4
- 239000004367 Lipase Substances 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- 235000019421 lipase Nutrition 0.000 claims description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 4
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 13
- 239000000835 fiber Substances 0.000 abstract description 9
- 241000219000 Populus Species 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000003814 drug Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 235000019795 sodium metasilicate Nutrition 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
-
- 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
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- 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
- D21D1/303—Double disc mills
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The application discloses a pulping method of three residues in agriculture and forestry, which comprises the following steps: pretreating the screened mixed wood chips of the three residues of agriculture and forestry by using alkali liquor and biological enzyme; and washing the pretreated mixed wood chips, steaming, extruding, presoaking, and pulping by a high-concentration mill and a low-concentration mill to obtain finished pulp. The pulping method properly screens raw materials according to the wood characteristics of three residues in agriculture and forestry, and pretreats the raw materials by biological enzymes, so that the consumption of chemicals is reduced, the load of wastewater treatment of a system is reduced, the bleaching effect is ensured, the bleaching loss is reduced, the utilization rate of the three residues in agriculture and forestry is effectively improved, the raw material resource of pulping and papermaking fibers is widened, and the situation that the raw materials of pulping and papermaking fibers are tense is greatly lightened. According to the invention, the pulping process flow is greatly optimized according to the difference between the three residues in agriculture and forestry and the wood property of poplar, the pulping cost is lower, and the method has the benefits of saving wood resources and protecting environment.
Description
Technical Field
The application relates to the technical field of papermaking, in particular to a pulping method of three residues in agriculture and forestry.
Background
China is a large country of agriculture and forestry, a large amount of woods are used for various purposes every year, but the comprehensive utilization rate is relatively low, the comprehensive utilization rate of wood is only 50% -60%, and the developed countries generally reach 80% -90%. In China, the utilization rate of a large amount of branches, cut-off, wood processed leftover materials and the like is not high, and a considerable part of the leftover materials are treated as waste or are simply burnt, so that the waste of resources is realized.
In order to solve the problem of shortage of raw materials in pulping and papermaking production, the diversification of raw materials of pulping fibers has been a trend. The agricultural and forestry residues are a generic name and comprise various wood chip types, the sources are complex, the thickness of the processed wood chips is different, the difference of moisture, basic density and the like is larger, the storage time is also different, the pulping performance of various wood chips is quite different, and the difficulty of the mixed pulping technology is quite high. The research on the high-yield clean pulping technology by using the agriculture and forestry three-residue mixed wood chips has great significance for relieving the shortage situation of the current pulping and papermaking fiber raw materials.
Disclosure of Invention
The invention provides a pulping method of three residues in agriculture and forestry, which aims to solve the technical problem of high difficulty in the mixed pulping technology of the three residues in agriculture and forestry in the prior art.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
in a first aspect of the invention, there is provided a method of pulping three agricultural and forestry residues comprising the steps of:
s1, pretreating the screened mixed wood chips of three residues of agriculture and forestry by using alkali liquor and biological enzyme;
s2, washing the pretreated mixed wood chips, steaming, extruding, presoaking, and pulping by a high-consistency mill and a low-consistency mill to obtain finished pulp.
Further, in the step S1, the alkali solution includes sodium hydroxide; the biological enzyme is one or more of lipase, laccase and pectase.
Further, the dosage of the alkali liquor is 0.05% -1% of the mixed wood chips; the dosage of the biological enzyme is 20 g-100 g per ton of the mixed wood chips.
Further, in the mixed wood chips after the screening step, the weight content of pine chips is less than or equal to 5%, the weight content of dark color chips is less than or equal to 5%, and the weight content of wood chips with poor freshness is less than or equal to 10%.
Further, in the step S2, the steps of extrusion and pre-impregnation are repeated, specifically including 1-stage extrusion, 1-stage pre-impregnation, 2-stage extrusion and 2-stage pre-impregnation, wherein the pre-impregnation liquid of the 1-stage pre-impregnation includes sodium hydroxide, and the dosage of the pre-impregnation liquid is 0.05% -2.0% of that of the mixed wood chip after steaming treatment; the 2-stage presoaking liquid comprises sodium hydroxide, hydrogen peroxide, sodium silicate and magnesium sulfate, wherein the dosage of sodium hydroxide to absolute materials is 3.0% -5.0%, the dosage of hydrogen peroxide to absolute materials is 0-3.0%, the dosage of sodium silicate to absolute materials is 0-2.0%, and the dosage of magnesium sulfate to absolute materials is 0-0.4%.
Further, the compression ratio of the 1-section extrusion is 1:2.8-3.2, and the compression ratio of the 2-section extrusion is 1:3.5-4.0.
Further, the pulp grinding concentration of the high-concentration mill is 20% -25%, the pulp temperature is 95 ℃ -100 ℃, and the pulp grinding power is 5000 KW-8000 KW; the double-disc grinding pulp concentration of the low-concentration grinding is 4.5% -5.5%, and the pulp grinding power is 500 KW-1400 KW.
Further, in the step S2, a step of 1-stage bleaching and a step of 2-stage bleaching are further included between the high-consistency grinding beating and the low-consistency grinding beating, in the step of 1-stage bleaching, the dosage of NaOH to absolute dry pulp is 1.0% -1.8%, the dosage of H2O2 to absolute dry pulp is 1.5% -5.0%, and the dosage of Na2SiO3 to absolute dry pulp is 1.0% -3.0%; the bleaching concentration is 20-35%, the bleaching temperature is 80-95 ℃ and the bleaching time is 60-90 min; in the 2-stage bleaching step, the dosage of NaOH to absolute dry pulp is 0.5-1.0%, the dosage of H2O2 to absolute dry pulp is 1.5-3.0%, and the dosage of Na2SiO3 to absolute dry pulp is 1.0-1.5%; the bleaching concentration is 20-30%, the bleaching temperature is 80-90 ℃ and the bleaching time is 50-70 min.
Further, the step of pulping by a low-concentration mill further comprises the step of screening, washing and concentrating, wherein the screen gap of the pressure screen is 0.15-0.2 mm, the pulp inlet concentration is 1.2-2%, and the pulp inlet pressure is 2.0-4.0 bar; the inlet-outlet pressure difference (Poutlet-Pinlet) is not more than 50kPa; the flow ratio of the slag slurry to the good slurry is 25% -40%; 40% -85% of operation load; the flow ratio of the good pulp of the 2-section pressure screen to the flow ratio of the good pulp of the 1-section pressure screen are 25% -40%.
Further, the steaming treatment temperature in the step S2 is 80-90 ℃ and the material level is 50-70%.
According to the pulping method of the three residues in agriculture and forestry, provided by the invention, the raw materials are properly screened according to the characteristics of the three residues in agriculture and forestry, and are pretreated by biological enzymes, so that the consumption of chemicals is reduced, the load of wastewater treatment of a system is reduced, the bleaching effect is ensured, the bleaching loss is reduced, the utilization rate of the three residues in agriculture and forestry is effectively improved, the raw material resource of pulping fibers is widened, and the situation that the raw materials of pulping and papermaking fibers are tense is greatly lightened. According to the invention, the pulping process flow is greatly optimized according to the difference between the three residues in agriculture and forestry and the wood property of poplar, the pulping cost is lower, and the method has the benefits of saving wood resources and protecting environment.
Detailed Description
In order to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The embodiment of the application provides a pulping method of three residues in agriculture and forestry, which comprises the following steps:
s1, pretreating the screened mixed wood chips of three residues of agriculture and forestry by using alkali liquor and biological enzyme;
s2, washing the pretreated mixed wood chips, steaming, extruding, presoaking, and pulping by a high-concentration mill and a low-concentration mill to obtain finished pulp.
According to the pulping method of the three residues in agriculture and forestry, provided by the embodiment of the application, raw materials are properly screened according to the characteristics of the three residues in agriculture and forestry, and are pretreated by biological enzymes, so that the consumption of chemicals is reduced, the load of wastewater treatment of a system is reduced, the bleaching effect is ensured, the bleaching loss is reduced, the utilization rate of the three residues in agriculture and forestry is effectively improved, the raw material resource of the pulping machine is widened, and the situation that the raw materials of pulping and papermaking fibers are tense is greatly lightened. According to the invention, the pulping process flow is greatly optimized according to the difference between the three residues in agriculture and forestry and the wood property of poplar, the pulping cost is lower, and the method has the benefits of saving wood resources and protecting environment.
The pulping method of the three residues in agriculture and forestry specifically comprises the following steps:
1) The mixed wood chip adopting three residues of agriculture and forestry is characterized in that: the wood chip length is 20 mm-50 mm, the thickness is 4.0+/-2 mm, the wood chip qualification rate is more than or equal to 75% (mass percent), the bark rate is less than or equal to 0.5%, the wood chip moisture is more than or equal to 38%, and the wood chip contains pine wood chips (less than 5%), dark color chips (less than 5%) and wood chips with poor freshness (less than 10%). 2) Pretreating the mixed wood chips of the three residues of agriculture and forestry by using alkali liquor and biological enzyme; 3) Washing the mixed wood chips of the three residues of agriculture and forestry; 4) Steaming the mixed wood chips of the three residues of agriculture and forestry; 5) Feeding the agriculture and forestry three-residue mixed wood chips into a 1-section extrusion tearing machine for extrusion tearing; 6) Feeding into a 1-stage presoaking device, and adding 1-stage presoaking liquid; 7) Feeding into a 2-section extrusion tearing machine for extrusion tearing; 8) Feeding into a 2-section presoaking device, and adding 2-section presoaking liquid; 9) 1 section of disc mill high-concentration pulping; 10 1 stage high concentration bleaching; 11 2 stage high concentration bleaching; 12 2 stage low-concentration pulping; 13 Screening, washing, concentrating and the like to obtain finished pulp.
The reagents used in the examples below are all commercially available.
Example 1
Mixing the three residues of agriculture and forestry, performing spot check, judging the appearance, and screening wood chips meeting requirements. The three-residue wood chip contains 1.58% of pine wood chips, 2.56% of dark color chips, 5.10% of wood chips with poor freshness, 20-50 mm of wood chip length, 4.0+/-2 mm of thickness, 80% of wood chip qualification rate (mass percent), 0.35% of bark rate and 45.3% of wood chip water content, and meets the use conditions. And (3) carrying out biological enzyme pretreatment on the mixed wood chips, and delivering the agricultural and forestry three-residue mixed wood chips subjected to the biological enzyme pretreatment to production and use.
The production process flow is briefly described: the method comprises the steps of wood chip preparation, wood chip washing, 1-section pre-steaming bin, 1-section extrusion, 1-section reaction bin (1-section pre-soaking liquid medicine is added), 2-section extrusion, 2-section reaction bin (2-section pre-soaking liquid medicine is added), 1-section grinding (bleaching liquid medicine is added), 1-section cyclone separator, cooling spiral (adding whitening agent), high-concentration bleaching tower, 1-section dehydration concentrator, 2-section high-concentration bleaching, a submersible tank, double disc grinding, an intermediate tank, a pressure screen, a good pulp tank, multiple discs and a medium-concentration pulp storage tower (pH is adjusted to 7-8.5 by sulfuric acid).
The main production process technical conditions are as follows:
(A) The amount of the biological enzyme is 25 g/ton, wherein, the lipase is 20%, the laccase is 50% and the pectase is 30%. The dosage of sodium hydroxide is 1 kg/ton, and the treatment time is 24 hours.
(B) 1 stage chip extruder (MSD): compression ratio 1:3.1, speed 67rpm, torque 79 kN.m, power 698kw, torque control priority.
(C) 1 section presoaking device: the dosage of NaOH to absolute dry pulp is 1.2%, and the material level of a 1-stage reaction bin is 55%.
(D) 2-stage chip extruder (MSD): compression ratio 1:4.0, speed 58rpm, torque 73 kN.m, power 660kw, torque control priority.
(E) 2-section presoaking device: naOH is 3.7% of absolute dry pulp, H 2 O 2 The dosage of absolute dry pulp is 2.0 percent, na 2 SiO 3 The dosage of absolute dry pulp is 1.0 percent, mgSO 4 The dosage of the absolute dry pulp is 0.2 percent, and the material level of the 2-stage reaction bin is 60 percent.
(F) 1 stage bleaching: medicineThe liquid adding point is 1 section of spray pipe of the disc mill and the cooling screw at the upper part of the high concentration tower, the dosage of NaOH to absolute dry pulp is 1.0 percent, H 2 O 2 The dosage of absolute dry pulp is 3.0 percent, na 2 SiO 3 The dosage of the absolute dry pulp is 1.5%, the bleaching concentration is 25%, the bleaching temperature is 85 ℃ and the bleaching time is 80min.
(G) 2, bleaching: naOH is used for 0.5% of absolute dry pulp, H 2 O 2 The dosage of absolute dry pulp is 1.5 percent, na 2 SiO 3 The dosage of the absolute dry pulp is 1.0%, the bleaching concentration is 25%, the bleaching temperature is 80 ℃ and the bleaching time is 70min.
(H) The double-disc grinding concentration is 5.4%, the grinding power is 980kw, and the unit energy consumption is 89kw/admt. The inlet pressure of the mill is 1.5bar, the outlet pressure of the mill is 3.2bar, and the pressure difference between the front and back of the pressure regulating valve of the outlet of the mill is 0.35bar;1 # to 3# pressure screen operating conditions: the screen gap of the pressure screen is 0.18mm, and the pulp inlet concentration is 1.7%; the slurry inlet pressure is 2.8bar; inlet and outlet differential pressure (P) Out of -P Feeding in ) 27kPa; the flow ratio of the slag slurry to the good slurry is 25%; operating load 45%; the flow ratio of the good slurry of the 2-section pressure screen to the flow ratio of the good slurry of the 1-section pressure screen are 28 percent.
Quality characteristics of bleached pulp: slurry whiteness is 75.5% ISO, freeness is 192mL, pH value is 8.05, PCD 1527ueq/L, fracture length is 3.09Km, and bulk is 3.25cm 3 G, dust degree 95mm 2 Per kg, the content of fiber bundles is 0.41%.
Example 2
Mixing the three residues of agriculture and forestry, performing spot check, judging the appearance, and screening wood chips meeting requirements. The three-residue wood chip contains 2.81% of pine wood chips, 3.32% of dark color chips, 7.55% of wood chips with poor freshness, 20-50 mm of wood chip length, 4.0+/-2 mm of thickness, 78% of wood chip qualification rate (mass percent), 0.45% of bark rate and 40.2% of wood chip water content, and meets the use conditions. And (3) carrying out biological enzyme pretreatment on the mixed wood chips, and delivering the agricultural and forestry three-residue mixed wood chips subjected to the biological enzyme pretreatment to production and use.
The production process flow is briefly described: the method comprises the steps of wood chip preparation, wood chip washing, 1-section pre-steaming bin, 1-section extrusion, 1-section reaction bin (1-section pre-soaking liquid medicine is added), 2-section extrusion, 2-section reaction bin (2-section pre-soaking liquid medicine is added), 1-section grinding (bleaching liquid medicine is added), 1-section cyclone separator, cooling spiral (adding whitening agent), high-concentration bleaching tower, 1-section dehydration concentrator, 2-section high-concentration bleaching, a submersible tank, double disc grinding, an intermediate tank, a pressure screen, a good pulp tank, multiple discs and a medium-concentration pulp storage tower (pH is adjusted to 7-8.5 by sulfuric acid).
The main production process technical conditions are as follows:
(A) The biological enzyme is used in an amount of 55 g/ton, wherein the lipase is 25%, the laccase is 50% and the pectase is 25%. The dosage of sodium hydroxide is 2.5 kg/ton, and the treatment time is 36 hours.
(B) 1 stage chip extruder (MSD): compression ratio 1:3.2, speed 70rpm, torque 77 kN.m, power 662kw, torque control priority.
(C) 1 section presoaking device: the dosage of NaOH to absolute dry pulp is 1.5 percent, and the material level of a 1-stage reaction bin is 65 percent.
(D) 2-stage chip extruder (MSD): compression ratio 1:3.9, speed 55rpm, torque 79 kN.m, power 680kw, torque control priority.
(E) 2-section presoaking device: naOH is used for the absolute dry pulp at 4.0 percent, H 2 O 2 The dosage of absolute dry pulp is 2.0 percent, na 2 SiO 3 The dosage of absolute dry pulp is 1.0 percent, mgSO 4 The dosage of absolute dry pulp is 0.3 percent, and the material level of a 2-stage reaction bin is 63 percent.
(F) 1 stage bleaching: the adding point of the liquid medicine is 1 section of spray pipe of a disc mill and the upper cooling spiral of a high concentration tower, the dosage of NaOH to absolute dry pulp is 1.2 percent, H 2 O 2 The dosage of absolute dry pulp is 3.5 percent, na 2 SiO 3 The dosage of the absolute dry pulp is 1.8%, the bleaching concentration is 25%, the bleaching temperature is 87 ℃ and the bleaching time is 80min.
(G) 2, bleaching: naOH is used for 0.6% of absolute dry pulp, H 2 O 2 The dosage of absolute dry pulp is 1.8 percent, na 2 SiO 3 The dosage of the absolute dry pulp is 1.1 percent, the bleaching concentration is 25 percent, the bleaching temperature is 85 ℃ and the bleaching time is 70 minutes.
(H) The double-disc grinding concentration is 5.2%, the grinding power is 960kw, the unit energy consumption is 927kw/admt, the inlet pressure of the mill is 1.7bar, the outlet pressure of the mill is 3.3bar, and the pressure difference between the front and the back of the pressure regulating valve of the outlet of the mill is 0.39bar;1 # to 3# pressure screen operating conditions: the screen gap of the pressure screen is 0.18mm, and the pulp inlet concentration is 1.6%; the slurry inlet pressure is 2.9bar; inlet and outlet differential pressure (P) Out of -P Feeding in ) 28kPa; 27% of flow rate of slag slurry and good slurry; an operating load of 51%; the flow ratio of the good slurry of the 2-section pressure screen to the flow ratio of the good slurry of the 1-section pressure screen are 30%.
Quality characteristics of bleached pulp: slurry whiteness is 75.1% ISO, freeness is 188mL, fracture length is 3.55Km, and bulk is 2.93cm 3 G, dust degree 127mm 2 Per kg, 0.45% fiber strand content, pH 8.48, PCD 2050ueq/L.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A pulping method for three residues in agriculture and forestry, comprising the following steps:
s1, pretreating the screened mixed wood chips of three residues of agriculture and forestry by using alkali liquor and biological enzyme;
s2, washing the pretreated mixed wood chips, steaming, extruding, presoaking, and pulping by a high-consistency mill and a low-consistency mill to obtain finished pulp.
2. The method for pulping of three agricultural residues according to claim 1, wherein in step S1, the alkaline solution includes sodium hydroxide; the biological enzyme is one or more of lipase, laccase and pectase.
3. The method for pulping of three agricultural residues according to claim 2, wherein the amount of the alkali liquor is 0.05% to 1% of the mixed wood chips; the dosage of the biological enzyme is 20 g-100 g per ton of the mixed wood chips.
4. The method of pulping of three agricultural and forestry residues according to claim 1, wherein the mixed wood chips after the screening step have a pine chip weight content of less than or equal to 5%, a dark chip weight content of less than or equal to 5% and a poor freshness chip weight content of less than or equal to 10%.
5. The method according to any one of claims 1 to 4, wherein in the step S2, the steps of extruding and pre-impregnating are repeated, specifically including 1-stage extrusion, 1-stage pre-impregnation, 2-stage extrusion, and 2-stage pre-impregnation, wherein the pre-impregnation liquid of 1-stage pre-impregnation includes sodium hydroxide in an amount of 0.05% -2.0% of the mixed wood chips after steaming treatment; the 2-stage presoaking liquid comprises sodium hydroxide, hydrogen peroxide, sodium silicate and magnesium sulfate, wherein the dosage of sodium hydroxide to absolute materials is 3.0% -5.0%, the dosage of hydrogen peroxide to absolute materials is 0-3.0%, the dosage of sodium silicate to absolute materials is 0-2.0%, and the dosage of magnesium sulfate to absolute materials is 0-0.4%.
6. The method for pulping of three agricultural residues according to claim 5, wherein the compression ratio of the 1-stage extrusion is 1:2.8-3.2, and the compression ratio of the 2-stage extrusion is 1:3.5-4.0.
7. The pulping process of three residues in agriculture and forestry according to any one of claims 1 to 4, wherein the high-concentration mill has a pulp concentration of 20% to 25%, a pulp temperature of 95 ℃ to 100 ℃ and a pulp power of 5000KW to 8000KW; the double-disc grinding pulp concentration of the low-concentration grinding is 4.5% -5.5%, and the pulp grinding power is 500 KW-1400 KW.
8. The method for pulping three residues in agriculture and forestry according to any one of claims 1 to 4, wherein the step S2 further comprises 1 stage bleaching and 2 stage bleaching steps between the high consistency grinding and the low consistency grinding, and NaOH is used in an amount of 1.0% to 1.8% for absolute dry pulp in the 1 stage bleaching step, and H 2 O 2 The dosage of absolute dry pulp is 1.5 to 5.0 percent, na 2 SiO 3 The dosage of absolute dry pulp is 1.0 to 3.0 percent; the bleaching concentration is 20-35%, the bleaching temperature is 80-95 ℃ and the bleaching time is 60-90 min; in the 2-stage bleaching step, the dosage of NaOH to absolute dry pulp is 0.5-1.0%, H 2 O 2 The dosage of absolute dry pulp is 1.5 to 3.0 percent, na 2 SiO 3 The dosage of absolute dry pulp is 1.0 to 1.5 percent; the bleaching concentration is 20-30%, the bleaching temperature is 80-90 ℃ and the bleaching time is 50-70 min.
9. The method for pulping three residues in agriculture and forestry according to any one of claims 1 to 4, wherein the step of pulping by a low consistency mill is further followed by a step of screen washing and concentration, wherein the screen gap of the pressure screen is 0.15mm to 0.2mm, the pulp inlet concentration is 1.2% to 2%, and the pulp inlet pressure is 2.0 to 4.0bar; inlet and outlet differential pressure (P) Out of -P Feeding in ) Not more than 50kPa; the flow ratio of the slag slurry to the good slurry is 25% -40%; 40% -85% of operation load; the flow ratio of the good pulp of the 2-section pressure screen to the flow ratio of the good pulp of the 1-section pressure screen are 25% -40%.
10. The method for pulping three agricultural residues according to any one of claims 1 to 4, wherein the steaming temperature in the step S2 is 80 to 90 ℃, and the stock level is 50 to 70%.
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