CN112726254B - Method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and biological enzyme treatment on wheat straw - Google Patents
Method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and biological enzyme treatment on wheat straw Download PDFInfo
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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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention relates to a method for preparing natural color biomechanical pulp and fully utilizing byproducts by treating wheat straw with hot water and alkaline bioenzyme, which firstly provides a method for preparing high-strength natural color biomechanical pulp by treating wheat straw with hot water and alkaline bioenzyme, thereby meeting the requirements of producing natural color packaging paper and paper-based materials, recycling byproducts to prepare biomass compound fertilizer without solid waste discharge and realizing high-value full utilization of wheat straw. The preparation method is simple, green, clean and efficient, and has good practical application value and wide application prospect.
Description
Technical Field
The present disclosure belongs to the field of papermaking technology and new material, and is especially one kind of hot water treating and biological enzyme treating synergistic biomechanical pulp and side product utilizing process.
Background
The paper industry is not only the consumer product industry, but also the important basic raw material industry, and relates to various fields of life, religion, industry and agriculture, national defense, aviation and the like. The import of paper pulp in 2016 reaches 2106 ten thousand tons, the import of waste paper reaches 2850 ten thousand tons, the import dependence of pulping and papermaking fiber raw materials in 2016 is close to 50%, and the import of foreign waste paper makes up the gap of the fiber raw materials in China, thereby supporting the development of the papermaking industry in China. China is faced with the problem of serious shortage of papermaking raw materials. Therefore, the project group develops a new technology for preparing the biomechanical pulp by utilizing the agricultural straw to replace the waste paper raw material, and provides an important way for solving the shortage of the paper raw material and the high-valued utilization of the agricultural straw.
In traditional pulping and papermaking, wheat straw is an important papermaking raw material as a representative of grass, but because wheat straw leaves, leaf sheaths and the like are not easy to pulp, only wheat straw is usually reserved in the process of preparing materials, and the wheat straw leaves, the wheat straw leaf sheaths and the like are required to be removed as much as possible, but the removal of the wheat straw leaves, the wheat straw leaf sheaths and the like not only causes the increase of the cost of preparing materials, but also greatly reduces the utilization rate of the wheat straw raw material. Therefore, the project develops a clean and efficient pulping process taking whole wheat straw as a raw material, and develops a high-value utilization technology for preparing biomass fertilizer by byproducts in the pulping process, thereby opening up an important path for comprehensive high-value utilization of agricultural straw.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing natural color biomechanical pulp and fully utilizing byproducts by treating wheat straw with hot water and alkaline bioenzyme. The preparation method is simple, green, clean and efficient, and has good practical application value and wide application prospect.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the invention provides a method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment with biological enzyme treatment of wheat straw, comprising the following steps:
carrying out hot water treatment, extrusion and wire separation on wheat straw, and collecting extrusion and wire separation section wastewater;
the wheat straw pulp after extrusion and wire separation is subjected to enzymolysis by adopting alkaline biological enzyme, and waste water generated in the enzyme treatment stage is collected;
pulping the wheat straw pulp subjected to enzymolysis treatment to obtain biomechanical pulp, and collecting pulping washing water;
mixing extrusion yarn-separating section waste water, waste water generated in an enzyme treatment stage and pulping washing water, evaporating and concentrating, and recovering heat energy for hot water pretreatment; recovering solid residue, regulating pH with phosphoric acid, granulating, and making into biological compound fertilizer.
In the traditional papermaking process, wheat straw is taken as a representative of grass, but because wheat straw leaves, leaf sheaths and the like are not easy to pulp, only wheat straw is usually reserved in the material preparation process, and the wheat straw leaves, the wheat straw leaf sheaths and the like are required to be removed as much as possible, but the removal of the wheat straw leaves, the wheat straw leaf sheaths and the like not only increases the cost of material preparation, but also greatly reduces the utilization rate of the wheat straw raw materials. According to researches, the raw material structure, chemical composition, fiber morphology and content of different wheat straw parts are different, the ash content, alkali extract content and pentosan content of wheat leaves and leaf sheaths are higher than those of the straw parts, and the cellulose content is slightly lower than those of the straw parts; in terms of chemical structure, the fiber of the straw part is longer, the stem base is longer than the stem middle part, and the fiber cells of the wheat She Heshe sheath are shorter and thicker than the straw part. The whole wheat straw pulping is very difficult, but the invention adopts a method of combined treatment of weak alkaline hot water and biological enzyme, so that the biological mechanical pulp with excellent performance can be prepared, and meanwhile, the byproducts can be used for preparing the easily degradable biomass compound fertilizer.
In a second aspect of the invention, there is provided a biomechanical pulp and a biomass composite fertilizer prepared by any of the methods described herein.
In a third aspect, the present invention provides the use of the biomechanical pulp described above in the fields of life, religion, industry and agriculture, national defense and aviation.
The beneficial effects of the invention are as follows:
(1) The wheat straw waste obtained after the wheat grains are obtained is used as a raw material, the wheat straw is treated with hot water according to the liquid ratio of 1:4-1:8, a small amount of KOH is added, the pH value of the hot water is regulated to be 10-14, the treatment temperature is 80-100 ℃, and the treatment time is 15-60min; after the hot water treatment is finished, the wheat straw is extruded and cut into filaments; the wheat straw subjected to the wire separation is acted with alkaline biological compound enzyme, the treatment temperature is 40-60 ℃, and the treatment time is 30-90min; pulping the wheat straw after biological treatment to prepare the biological mechanical pulp, and applying the biological mechanical pulp to the preparation of corrugated paper or cardboard non-surface paper. The refining washing water is treated by a multi-effect evaporator, and heat energy is recovered for the hot water pretreatment section in the step S1; and regulating the pH value of the recovered solid residue by using a trace amount of phosphoric acid, and granulating to prepare the biomass compound fertilizer.
(2) And fluffing and forming the wheat straw biomechanical pulp to obtain the non-surface layer of the corrugated paper base paper and/or the cardboard paper. Recovering the waste water of the extrusion and wire separation section, the waste water of biological treatment and the pulping washing water in the pulping process, and adopting a multi-effect evaporator to evaporate and concentrate, adjust the pH value, granulate and the like to prepare the biomass compound fertilizer.
(3) In the invention, whole wheat straw is used as a raw material, in the whole preparation process of the biomechanical pulp, through reasonable optimization of the preparation process and steps, only hot water, trace KOH and alkaline bioenzyme are adopted, the pH value of the biomechanical pulp is slightly alkaline when the pulp grinding is finished, the obtained biomechanical pulp has higher yield (65-85%), the conventional method of pulping by only using wheat straw is broken, the wheat straw utilization rate is greatly improved, compared with the conventional mechanical pulp, the pulping energy consumption can be saved by more than 40%, and various physical indexes meet the requirements of producing packaging paper and paper-based materials.
(4) In the invention, pulping washing water is treated by adopting a multi-effect evaporator, 15-35% of solid residues are recovered, the pH value of the solid residues is regulated by using trace phosphoric acid, and then the solid residues are granulated to prepare the biomass compound fertilizer, and the fertilizer contains a proper amount of K, P elements and a large amount of easily-degradable straw components with small particles. The preparation method is simple, energy-saving and environment-friendly, accords with the national industrial policies of resource conservation, economic cycle, energy conservation and emission reduction, and can generate good social benefit, economic benefit and ecological benefit, thereby having good practical application value and industrial application prospect.
(5) The preparation method is simple, has strong practicability and is easy to popularize.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, and/or combinations thereof.
In the present invention, the liquid ratio refers to the boiling liquid ratio of the raw materials, and the liquid ratio is: the ratio of the weight of the oven dried raw materials to the volume of the total liquid of the cooking.
A method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and biological enzyme treatment on wheat straw comprises the following steps:
carrying out hot water treatment, extrusion and wire separation on wheat straw, and collecting extrusion and wire separation section wastewater;
the wheat straw pulp after extrusion and wire separation is subjected to enzymolysis by adopting alkaline biological enzyme, and waste water generated in the enzyme treatment stage is collected;
pulping the wheat straw pulp subjected to enzymolysis treatment to obtain biomechanical pulp, and collecting pulping washing water;
mixing extrusion yarn-separating section waste water, waste water generated in an enzyme treatment stage and pulping washing water, evaporating and concentrating, and recovering heat energy for hot water pretreatment; recovering solid residue, regulating pH with phosphoric acid, granulating, and making into biomass compound fertilizer.
In some embodiments, the wheat straw is cut into 3-6cm pieces and then subjected to a hot water treatment.
In some embodiments, the wheat straw is treated with hot water at a liquid ratio of 1:4-1:8 while adding a small amount of KOH, adjusting the pH of the hot water to 10-14, and the treatment temperature to 80-100deg.C for 15-60min.
In some embodiments, extrusion and filament separation are performed by using a screw extruder under the following process conditions: the compression ratio of the screw extruder was controlled at 1:3-6.
In some embodiments, the alkaline biological complex enzyme is a complex enzyme of three enzymes, xylanase, cellulase and pectinase, the total amount used is: the enzyme activity ratio of xylanase, cellulase and pectase is 0-8, and the enzyme activity ratio is 10-80 IU/mL: 0 to 3:0 to 4; preferably, the total enzyme dosage is 40-60 IU/mL.
In some embodiments, the number of refining times is determined according to the production needs, and the freeness of the refining is controlled to be 35-45 SR.
In some embodiments, the refining process is specifically: pulping process conditions: high-concentration pulping is carried out by using a KPF series high-concentration disc mill, the rotating speed of a main shaft is 3000-4000 r/min, one-stage or two-stage pulping is adopted, and the pulping gap is 0.15-0.5mm.
In some embodiments, the mass ratio of the wastewater produced in the extrusion yarn-splitting section wastewater and the enzyme treatment stage to the pulping and washing water is 1-5:20-30:10-20, and the wastewater from different sources is matched, so that the concentrated treatment can be realized, the composition of the wastewater can be utilized, the synergistic effect can be realized, and the fertilizer efficiency of the biomass compound fertilizer is improved.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The test methods, in which specific conditions are not noted in the following examples, are generally conducted under conventional conditions. The alkaline biological enzyme adopted in the invention is from Shandong Long Kete enzyme preparation limited company and Norwegian biological enzyme preparation China company.
Example 1
A process for preparing biomechanical pulp by combining hot water with bio-enzyme treatment of wheat straw is provided, and the biomechanical pulp is prepared and tested for pulp preparation performance.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5cm long standby raw materials, putting the standby raw materials into a normal-temperature reaction kettle, and carrying out hot water treatment on the wheat straw according to the liquid ratio of 1:5 (g/mL), wherein the temperature is 87 ℃, and the treatment time is controlled to be 17min.
(2) Adding a trace of KOH into the mixture of the hot water and the wheat straw in the reaction kettle, and adjusting the pH value of the hot water to be 14, so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved out of the wheat straw, the wheat straw is saturated with water and softened, and the pH value of the water of the wheat straw reaches 9 at the end of treatment.
(3) The wheat straw which is saturated and softened by water is extruded on a screw extruder, and the pressure of the extruder is adjusted, so that the wheat straw achieves a uniform and good wire-separating effect. The saturated softening and yarn separation of the wheat straw is better, the primary extrusion is carried out, the compression ratio of the screw extruder is controlled to be 1:3, and the waste water of the extrusion yarn separation section is collected;
(4) The softened wheat straw and alkaline biological enzyme are treated in a bioreactor for 53min, the temperature is controlled at 55 ℃, the liquid ratio is controlled at 1:4 (g/mL), the wheat straw is continuously stirred and mixed, the wheat straw and the biological enzyme fully act, the wheat straw fiber is further softened, and the waste water generated in the enzyme treatment stage is collected;
the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectase, the total dosage is 60IU/mL (60 IU biological enzyme is adopted in 1mL feed liquid), and the enzyme activity ratio of xylanase, cellulase and pectase is 3:2.4:1.
(5) The wheat straw after biological treatment is subjected to two-stage pulping by a pulping machine, so that the pulping degree of the paper pulp reaches 40 DEG SR.
The technological parameters of the pulping are as follows: performing high-concentration pulping by using a KPF high-concentration disc mill, wherein the rotating speed of a main shaft is 3000r/min, the pulping gap is 0.2mm, and collecting pulping washing water;
(6) The wheat straw bio-mechanical pulp after being ground is disintegrated by a fiber fluffer to be evenly mixed, and then is made into 70g/m by a paper sheet former 2 Is a natural color corrugated paper. Its physical strength was then measured. Each physical index meets the requirements of producing natural-color packaging paper and paper-based materials.
(7) Mixing extrusion yarn-separating section wastewater, wastewater generated in an enzyme treatment stage and pulping washing water according to a mass ratio of 2:20:12, and performing evaporation concentration, wherein the evaporation concentration adopts a multi-effect evaporator to treat the evaporation concentration to obtain residue, and heat energy is recovered for the hot water steam pretreatment section in the step (1); and adding phosphoric acid into the residue to adjust the pH to 6, and drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 2
A process for preparing biomechanical pulp by combining hot water of wheat straw with biological enzyme treatment, which is used for preparing natural-color corrugated paper by preparing biomechanical pulp and testing the pulp forming performance of the natural-color corrugated paper.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5cm long standby raw materials, putting the standby raw materials into a normal-temperature reaction kettle, and carrying out hot water treatment on the wheat straw according to the liquid ratio of 1:4 (g/mL), wherein the temperature is 100 ℃, and the treatment time is controlled to be 30min.
(2) Adding a trace amount of alkali KOH into the mixture of the hot water and the wheat straw in the reaction kettle, and adjusting the pH value of the hot water to be 13, so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved in the wheat straw, and the pH value of the water-containing wheat straw reaches 8 when the wheat straw is saturated with water and softened.
(3) The wheat straw which is saturated and softened by water is extruded on a screw extruder, and the pressure of the extruder is adjusted, so that the wheat straw achieves a uniform and good wire-separating effect. The wheat straw is better in saturated softening and yarn separation, and is extruded for one time; the compression ratio of the screw extruder is controlled to be 1:4, and extrusion yarn-dividing section waste water is collected;
(4) The softened and separated wheat straw and alkaline biological enzyme are treated in a bioreactor for 42min, the temperature is controlled at 58+/-2 ℃, the liquid ratio is controlled at 1:5 (g/mL), the wheat straw is continuously stirred and mixed, the wheat straw and the biological enzyme fully act, the wheat straw fiber is further softened, and the waste water generated in the enzyme treatment stage is collected;
the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectase, the total dosage is 60IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectase is 5:4:1.5.
(5) The wheat straw after biological treatment is subjected to two-stage pulping by a pulping machine, so that the pulping degree of the paper pulp reaches 42 DEG SR.
The technological parameters of the pulping are as follows: high-concentration pulping is carried out by using a KPF high-concentration disc mill, the rotating speed of a main shaft is 3000r/min, the pulping gap is 0.25mm, and pulping washing water is collected
(6) The wheat straw bio-mechanical pulp after being ground is disintegrated by a fiber fluffer to be evenly mixed, and then is made into 80g/m by a paper sheet former 2 Is a natural color corrugated paper. Its physical strength was then measured. Each physical index meets the requirements of producing natural-color packaging paper and paper-based materials.
(7) Mixing extrusion yarn-separating section wastewater, wastewater generated in an enzyme treatment stage and pulping washing water according to a mass ratio of 10:15:12, and performing evaporation concentration, wherein the evaporation concentration adopts a multi-effect evaporator to treat the evaporation concentration to obtain residue, and heat energy is recovered for the hot water steam pretreatment section in the step (1); and adding phosphoric acid into the residue to adjust the pH to 6, and drying, crushing and granulating to prepare the biomass organic fertilizer.
Example 3
A process for preparing biomechanical pulp by combining hot water of wheat straw with biological enzyme treatment is provided, and the embodiment prepares natural-color corrugated paper of the biomechanical pulp and tests the pulp forming performance of the natural-color corrugated paper.
(1) Cutting the physically selected and dedusted air-dried wheat straw into 5cm long standby raw materials, putting the standby raw materials into a normal temperature processor or a reaction kettle, and carrying out hot water treatment on the wheat straw according to the liquid ratio of 1:6 (g/mL), wherein the temperature is 105 ℃, and the treatment time is controlled to be 25min.
(2) Adding a trace of KOH into the mixture of the hot water and the wheat straw in the reaction kettle, and adjusting the pH value of the hot water to 13, so that a small amount of hemicellulose, lignin, pectin and other substances are dissolved out of the wheat straw, the wheat straw is saturated with water and softened, and the pH value of the water of the wheat straw reaches 8 at the end of treatment.
(3) The wheat straw which is saturated and softened by water is extruded on a screw extruder, and the pressure of the extruder is adjusted, so that the wheat straw achieves a uniform and good wire-separating effect. The wheat straw is better in saturated softening and yarn separation, and is extruded for one time; the compression ratio of the screw extruder is controlled at 1:5, and extrusion yarn-dividing section waste water is collected;
(4) The softened wheat straw and alkaline biological enzyme are treated in a bioreactor for 64min, the temperature is controlled at 52 ℃, the liquid ratio is controlled at 1:4 (g/mL), the wheat straw is continuously stirred and mixed, the wheat straw and the biological enzyme fully act, the wheat straw fiber is further softened, and the waste water generated in the enzyme treatment stage is collected;
the alkaline biological compound enzyme is a compound enzyme of xylanase, cellulase and pectase, the total dosage is 40IU/mL, and the enzyme activity ratio of the xylanase, the cellulase and the pectase is 6:4:1.5.
(5) Pulping the wheat straw after biological treatment by a pulping machine to ensure that the pulping degree of the paper pulp reaches 41 DEG SR.
The technological parameters of the pulping are as follows: performing high-concentration pulping by using a KPF high-concentration disc mill, wherein the rotating speed of a main shaft is 3000r/min, one-stage pulping is adopted, the pulping gap is 0.15mm, and pulping washing water is collected;
(6) The wheat straw biological mechanical pulp after being ground is disintegrated by a fiber fluffer to be evenly mixed, and then is arranged in a paper sheet formerForming 50g/m 2 Is a natural color corrugated paper. Its physical strength was then measured. Each physical index meets the requirements of producing natural-color packaging paper and paper-based materials.
(7) Mixing extrusion yarn-separating section wastewater, wastewater generated in an enzyme treatment stage and pulping washing water according to a mass ratio of 8:20:12, and performing evaporation concentration, wherein the evaporation concentration adopts a multi-effect evaporator to treat the evaporation concentration to obtain residue, and heat energy is recovered for the hot water steam pretreatment section in the step (1); and adding phosphoric acid into the residue to adjust the pH to 6, and drying, crushing and granulating to prepare the biomass organic fertilizer.
Comparative example 1
The difference from example 1 is that no extrusion-stage waste water was added, and the waste water from the enzyme treatment stage, the refining washing water, was 11:6.
Comparative example 2
The difference from example 1 is that no refining washing water was added, and the press-wire section waste water, the waste water produced in the enzyme treatment stage, and the refining washing water were in a ratio of 4:13.
Performance test:
the performances of the natural color biomechanical pulp and the biomass organic fertilizer prepared in the examples and the comparative examples of the present invention were tested, wherein each test method is a general method in the art.
Table 1A comparison list of physical properties of pulp obtained by the method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and biological enzyme treatment
2. Examples 1-3 and comparative examples 1 and 2 preparation of Biomass compound fertilizer efficiency test
(1) Corn pot test
The bio-organic fertilizer prepared in examples 1-3 and comparative examples 1 and 2 was applied to potted corn for test, and a biomass compound fertilizer (3 g/kg soil) was applied in the corn seedling stage, and the results are shown in table 2, which show that the bio-organic fertilizer prepared in examples 1-3 and comparative examples 1 and 2 significantly increased corn biomass compared to the CK of the control group without fertilizing, wherein the best effect was obtained in example 2.
TABLE 2
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and although the present invention has been described in detail with reference to the above-mentioned embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the above-mentioned embodiments, or equivalents may be substituted for some of them. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. While the foregoing describes the embodiments of the present invention, it should be understood that the present invention is not limited to the embodiments, and that various modifications and changes can be made by those skilled in the art without any inventive effort while remaining within the scope of the present invention.
Claims (8)
1. The method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and alkaline biological enzyme treatment on wheat straw is characterized by comprising the following steps of:
carrying out hot water treatment, extrusion and wire separation on wheat straw, and collecting extrusion and wire separation section wastewater;
carrying out enzymolysis on the wheat straw pulp subjected to extrusion and wire separation by adopting alkaline biological enzyme, and collecting waste water generated in an enzyme treatment stage;
pulping the wheat straw pulp subjected to enzymolysis treatment to obtain biomechanical pulp, and collecting pulping washing water;
mixing extrusion yarn-separating section waste water, waste water generated in an enzyme treatment stage and pulping washing water, evaporating and concentrating, and recovering heat energy for hot water pretreatment; recovering 15-35% of solid residues, regulating the pH value by phosphoric acid, granulating, and preparing a biomass compound fertilizer;
the mass ratio of the extrusion yarn-separating section wastewater to the wastewater produced in the enzyme treatment stage to the pulping washing water is 1-5:20-30:10-20;
wherein, the wheat straw is treated by hot water according to the liquid ratio of 1:4-1:8, and simultaneously trace alkali is added, the pH value of the hot water is adjusted to be 10-14, the treatment temperature is 80-100 ℃ and the treatment time is 15-60min;
the enzymolysis uses an alkaline biological complex enzyme, wherein the alkaline biological complex enzyme is a complex enzyme of xylanase, cellulase and pectinase, and the total dosage is as follows: the enzyme activity ratio of xylanase, cellulase and pectase is 0-8, and the enzyme activity ratio is 10-80 IU/mL: 0-3: 0-4.
2. The method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and alkaline biological enzyme treatment of wheat straw according to claim 1, wherein the wheat straw is cut into 3-6cm sections and then subjected to hot water treatment.
3. The method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and alkaline biological enzyme treatment on wheat straw as claimed in claim 1, wherein the process conditions are as follows: the compression ratio of the screw extruder was controlled at 1:3-6.
4. The method for preparing natural color biomechanical pulp and fully utilizing byproducts by treating wheat straw with hot water and alkaline biological enzyme together according to claim 1, wherein the total dosage of the compound enzyme is 40-60 IU/mL.
5. The method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and alkaline biological enzyme treatment of wheat straw according to claim 1, wherein the pulp grinding times are determined according to production requirements, and the beating degree of pulp grinding is controlled to be 35-45 DEG SR.
6. The method for preparing natural color biomechanical pulp and fully utilizing byproducts by combining hot water treatment and alkaline biological enzyme treatment of wheat straw as claimed in claim 1, wherein the pulping treatment process is specifically as follows: pulping process conditions: and (3) performing high-concentration pulping by using a KPF series high-concentration disc mill, wherein the rotating speed of a main shaft is 3000-4000 r/min, one-stage or two-stage pulping is adopted, and the pulping gap is 0.15-0.5mm.
7. A biomechanical pulp prepared by the method of any one of claims 1-6.
8. Use of the biomechanical pulp of claim 7 in the fields of life, religion, industry and agriculture, national defense and aviation.
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