Method for preparing biomechanical unbleached pulp by wheat straw and fully utilizing byproducts
阅读说明：本技术 一种麦草秸秆制备生物机械本色浆及副产物全利用的方法 (Method for preparing biomechanical unbleached pulp by wheat straw and fully utilizing byproducts ) 是由 田中建 王瑞明 吉兴香 葛银凯 陈嘉川 杨桂花 马浩 于 2020-12-31 设计创作，主要内容包括：本发明涉及一种麦草秸秆制备生物机械本色浆及副产物全利用的方法,属于造纸技术与废弃物综合利用技术领域。本发明利用麦草秸秆作为制浆原料,采用汽蒸处理麦草秸秆,然后加微量KOH,对麦草秸秆进行热饱和软化后调节麦草秸秆的温度,加入碱性复合酶进行生物处理,最后对麦草秸秆进行磨浆,制备得到的机械浆能够满足生产本色包装类纸和纸基材料的要求,同时对其副产物进行回收制备生物质复合肥,使得固废变废为宝,实现了麦草秸秆的高值化全利用。因此具有良好的实际应用价值和广阔的应用前景。(The invention relates to a method for preparing biomechanical unbleached pulp by wheat straw and fully utilizing byproducts, belonging to the technical field of papermaking technology and comprehensive utilization of wastes. The method comprises the steps of utilizing wheat straw as a pulping raw material, treating the wheat straw by steaming, adding trace KOH, regulating the temperature of the wheat straw after the wheat straw is softened by thermal saturation, adding alkaline compound enzyme for biological treatment, and finally grinding the wheat straw into pulp, wherein the prepared mechanical pulp can meet the requirements of producing natural-color packaging paper and paper base materials, and meanwhile, the byproduct of the mechanical pulp is recycled to prepare the biomass compound fertilizer, so that the solid waste is changed into valuable, and the high-valued full utilization of the wheat straw is realized. Therefore, the method has good practical application value and wide application prospect.)
1. A method for preparing biomechanical unbleached pulp by using grass straws and fully utilizing byproducts is characterized by comprising the following steps of:
(1) cutting the physically selected and dedusted air-dried grass straws into standby raw materials with the length of 3-6 cm; collecting straws which can not be used as standby raw materials;
(2) putting the standby raw materials into a normal-temperature processor or a reaction kettle, carrying out alkaline complex enzyme action treatment on the grass straws according to a liquid ratio of 1:4-1:8W/V, adding KOH in the treatment process to ensure that the pH value of the grass straws is 7-14, and controlling the treatment time to be 30-90 min; collecting wastewater generated in an enzyme-alkali co-treatment stage;
(3) taking out the grass straws treated in the step (2), and further treating the grass straws by hot alkali (KOH) water vapor at the temperature of 80-120 ℃;
(4) grinding the straw treated in the step (3) into pulp in one or more sections to make the pulp degree of the straw in 25-55 DEG SR;
(5) washing the ground pulp with water to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and mixing uniformly to obtain the bio-mechanical pulp; collecting the milling washing water;
treating the wastewater and the pulping washing water generated in the enzyme-alkali co-treatment stage by using a multi-effect evaporator, evaporating and concentrating to obtain residues, and recovering heat energy for the hot alkali water vapor treatment stage in the step (3); and (3) mixing the residues with straws which cannot be used as standby raw materials in the step (1) to prepare the fertilizer.
2. The method according to claim 1, wherein the alkaline biological complex enzyme used in step (2) is a complex enzyme of three enzymes of alkaline xylanase, alkaline cellulase and alkaline pectinase, and the total dosage is 30-120 IU/mL; wherein the enzyme activity ratio of the alkaline xylanase, the alkaline cellulase and the alkaline pectinase is 0-12: 0-5: 0-3, the enzyme activity ratio is not 0, and the preferable ratio is 8-10: 3-4: 2-3.
3. The method of claim 1, wherein the amount of KOH added in step (2) is 0.5% to 3%.
4. The method of claim 1, wherein the treatment temperature in step (2) is 45-60 ℃.
5. The method according to claim 1, wherein the hot alkali steam treatment time in the step (3) is 10 to 60 min.
6. The method according to claim 1, wherein the hot alkaline water in step (3) has a pH of 9 to 14.
7. The method according to claim 1, wherein in the step (5), the mass ratio of the waste water generated in the enzyme-alkali co-treatment stage to the refining washing water is 2-5: 5-10;
the mass ratio of the residues to the straws which cannot be used as standby raw materials in the step (1) is 5-7: 1-2;
the specific process for preparing the fertilizer by acid adjustment comprises the following steps: adding phosphoric acid to adjust pH to 7, drying, pulverizing, and granulating.
8. The method of claim 1, wherein the grass is wheat straw.
9. Mechanical pulp and/or fertilizer prepared by the method of any one of claims 1 to 8.
10. Use of a mechanical pulp according to claim 9 for the preparation of a primary coloured wrapping paper, a paper based material and/or a fertiliser for promoting crop growth.
Technical Field
The invention belongs to the technical field of papermaking technology and comprehensive utilization of wastes, and particularly relates to a method for preparing biomechanical unbleached pulp by wheat straws and fully utilizing byproducts.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The paper industry is not only a consumer product industry, but also an important basic raw material industry, and relates to a plurality of fields such as life, culture and education, industry and agriculture, national defense, aviation and the like. In 2016, the import of paper pulp reaches 2106 ten thousand tons, the import of waste paper reaches 2850 ten thousand tons, the import dependence degree of papermaking fiber raw materials is close to 50 percent, and the import of a large amount of waste paper makes up the gap of the fiber raw materials in China and supports the development of the papermaking industry. The 'reform implementation scheme about the banned foreign garbage entry promotion solid waste import management system' is released in the center of 2017 in 4 months, and the waste paper which is not sorted and is banned from being imported in China from the end of the year is definitely stipulated. The total imported waste paper in 2018 is 33% of that in 2017, and China forbids importing waste paper in 2020. China is facing to lack about 2600 million tons of papermaking raw materials every year. The problem of resource shortage of the traditional paper industry is further highlighted. Research and development of new papermaking raw materials are imminent, and for this reason, researchers have found out and searched for new papermaking raw materials among recyclable and renewable grass raw materials.
In the traditional chemical pulping process, most of hemicellulose of wheat straw is degraded and then dissolved in pulping black liquor. The black liquor is often treated by an alkali recovery process to recover heat energy and alkali. Because the combustion heat value of the hemicellulose in the black liquor is very low, the hemicellulose is directly combusted, so that energy is wasted, and good biomass resources are consumed. The development of straw raw materials for preparing high-yield biological pulp, and the research and development of a pulping method which is suitable for wheat straw and has low pollution, low energy consumption and high quality are important research points in the Chinese paper-making industry and are also the industry development bottlenecks which need to be broken through urgently. The method for preparing the biomechanical unbleached pulp by using the wheat straws comprises the steps of treating the wheat straws by steaming or hot water by using the wheat straws as a pulping raw material, adding trace alkali, regulating the temperature of the wheat straws after the wheat straws are softened by thermal saturation, adding alkaline complex enzyme for biological treatment, and finally grinding the wheat straws into pulp, wherein the prepared mechanical pulp can meet the requirements for producing unbleached packaging paper and paper-based materials (see CN 109577059A). However, the problem of byproducts generated in the pulping process is not well solved, and the comprehensive high-value utilization of agricultural straws is not facilitated.
Disclosure of Invention
Aiming at the problems, the invention provides a method for preparing biomechanical unbleached pulp by wheat straws and fully utilizing byproducts. The method comprises the steps of utilizing wheat straw as a pulping raw material, treating the wheat straw by steaming, adding trace KOH, regulating the temperature of the wheat straw after the wheat straw is softened by thermal saturation, adding alkaline compound enzyme for biological treatment, and finally grinding the wheat straw into pulp, wherein the prepared mechanical pulp can meet the requirements of producing natural-color packaging paper and paper base materials, and meanwhile, the byproduct of the mechanical pulp is recycled to prepare the biomass compound fertilizer, so that the solid waste is changed into valuable, and the high-valued full utilization of the wheat straw is realized. Therefore, the method has good practical application value and wide application prospect.
The invention adopts the following technical scheme:
the invention provides a method for preparing biomechanical unbleached pulp by wheat straw and fully utilizing byproducts, which comprises the following steps of:
(1) cutting the physically selected and dedusted air-dried grass straws into standby raw materials with the length of 3-6 cm; collecting straws (such as rotten straws) which can not be used as standby raw materials;
(2) putting the standby raw materials into a normal-temperature processor or a reaction kettle, carrying out alkaline complex enzyme action treatment on the grass straws according to a liquid ratio of 1:4-1:8W/V, adding a trace amount of KOH in the treatment process to ensure that the pH value of the grass straws is 7-14, and controlling the treatment time to be 30-90 min; collecting wastewater generated in an enzyme-alkali co-treatment stage;
(3) taking out the grass straws treated in the step (2), and further treating the grass straws by hot alkali water vapor at the temperature of 80-120 ℃;
(4) grinding the straw treated in the step (3) into pulp in one or more sections to make the pulp degree of the straw in 25-55 DEG SR;
(5) washing the ground pulp with water to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and mixing uniformly to obtain the bio-mechanical pulp; collecting the milling washing water;
treating the wastewater and the pulping washing water generated in the enzyme-alkali co-treatment stage by using a multi-effect evaporator, evaporating and concentrating to obtain residues, and recovering heat energy for the hot alkali water vapor treatment stage in the step (3); and (2) mixing the residues with straws (such as rotten straws) which cannot be used as standby raw materials in the step (1) to prepare the acid fertilizer.
In a second aspect of the invention, there is provided a mechanical pulp and/or fertilizer prepared by the above-described process.
In a third aspect of the invention, there is provided the use of a mechanical pulp as described above in the preparation of a unbleached wrapping paper, a paper based material and/or the use of a fertilizer for promoting crop growth.
The beneficial effects of one or more of the above technical solutions are as follows:
the technical scheme is that grass is used as a raw material, alkaline biological enzyme is adopted for treatment, and then the grass is ground and washed after hot alkali steam heating treatment, so that the straw pulp is obtained. The pH of the bio-mechanical pulp is close to neutral when the pulping is finished, the pulping washing water is treated by the multi-effect evaporator, the recovered solid residue is used for boiler incineration, the recovered heat energy is used in a hot steam treatment section, the alkali recovery is not needed in the whole production process, and the pollution to the environment is avoided from the source. The technology conforms to the industrial policies of national resource conservation, economic cycle, energy conservation and emission reduction. The problems of difficult recovery of straw pulp alkali wastewater and serious pollution in the prior art are solved; the method has great significance for the industrial production of straw pulp and the development of the paper making industry.
The method is simple, has low requirement on equipment, and is suitable for production of wide medium and small sized paper making enterprises.
The mechanical pulp prepared by the method provided by the invention has the advantages that the ring crush index is obviously improved, and the mechanical pulp is used for preparing corrugated paper or boxboard paper and can obviously improve the compression strength of a paper box. The biomass compound fertilizer prepared from the byproducts is rich in nutrient elements such as phosphorus and potassium, and simultaneously contains a large amount of easily biodegradable hemicellulose and the like, so that the absorption of crops and the improvement of soil are utilized, the growth of the crops is effectively promoted, and meanwhile, the biomass compound fertilizer prepared by the method has the advantages of high fertilizer efficiency, good storage stability and the like through optimizing and screening process conditions. Therefore, it has good practical application value.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to solve the problems in the background art, one embodiment of the present invention provides a method for preparing bio-mechanical unbleached pulp from straw and stalk and fully utilizing by-products, comprising the following steps:
(1) cutting the physically selected and dedusted air-dried grass straws into standby raw materials with the length of 3-6 cm; collecting straws (such as rotten straws) which can not be used as standby raw materials;
(2) putting the standby raw materials into a normal-temperature processor or a reaction kettle, carrying out alkaline complex enzyme action treatment on the grass straws according to a liquid ratio of 1:4-1:8W/V, adding a trace amount of KOH in the treatment process to ensure that the pH value of the grass straws is 7-14, and controlling the treatment time to be 30-90 min; collecting wastewater generated in an enzyme-alkali co-treatment stage;
(3) taking out the grass straws treated in the step (2), and further treating the grass straws by hot alkali water vapor at the temperature of 80-120 ℃;
(4) grinding the straw treated in the step (3) into pulp in one or more sections to make the pulp degree of the straw in 25-55 DEG SR;
(5) washing the ground pulp with water to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and mixing uniformly to obtain the bio-mechanical pulp; collecting the milling washing water;
treating the wastewater and the pulping washing water generated in the enzyme-alkali co-treatment stage by using a multi-effect evaporator, evaporating and concentrating to obtain residues, and recovering heat energy for the hot alkali water vapor treatment stage in the step (3); and (2) mixing the residues with straws (such as rotten straws) which cannot be used as standby raw materials in the step (1) to prepare the acid fertilizer.
In another specific embodiment of the invention, the alkaline biological complex enzyme used in step (2) is a complex enzyme of three enzymes of alkaline xylanase, alkaline cellulase and alkaline pectinase, and the total dosage is 30-120 IU/mL; the enzyme activity ratio of the alkaline xylanase, the alkaline cellulase and the alkaline pectinase is 0-12: 0-5: 0-3, 0 is not selected for each enzyme, and the preferable ratio is 8-10: 3-4: 2-3. By optimizing the enzyme activity proportion of the biological complex enzyme, the high performance of the formed slurry is ensured, and the biological complex enzyme can be matched with the addition amount of each waste water, so that the fertilizer efficiency and the storage stability of the fertilizer are effectively improved.
In still another embodiment of the present invention, the amount of KOH used in step (2) is 0.5% to 3%.
In still another embodiment of the present invention, the treatment temperature in the step (2) is 45 to 60 ℃. Within this temperature range, the enzymatic efficiency is highest.
In another embodiment of the present invention, the hot alkali steam treatment time in the step (3) is 10 to 60 min. In the treatment time range, lignin, hemicellulose and other components can be dissolved out, and the reduction of the paper pulp yield caused by overlong treatment time is avoided.
In another embodiment of the present invention, the pH of the hot alkaline water in step (3) is 9-14. The effect is best when the steam with the pH value is used for treatment.
In another embodiment of the invention, in the step (5), the mass ratio of the wastewater generated in the enzyme-alkali co-treatment stage to the pulping washing water is 2-5: 5 to 10.
In another embodiment of the invention, the mass ratio of the residue to the straw which cannot be used as a standby raw material in the step (1) is 5-7: 1-2.
In another embodiment of the invention, the specific process for preparing the fertilizer by acid blending comprises the following steps: adding phosphoric acid to adjust pH to 7, drying, pulverizing, and granulating. By adopting phosphoric acid treatment, the alkaline is neutralized and nutrient elements such as phosphorus and the like are introduced at the same time, so that the method is more economic and environment-friendly.
In yet another embodiment of the present invention, the grass is wheat straw.
In yet another embodiment of the present invention, there is provided a mechanical pulp and/or fertilizer prepared by the above-described method. The mechanical pulp obtained by the invention not only has high yield, but also obviously improves the tensile strength, the ring crush strength and the like. Meanwhile, the prepared fertilizer is rich in nutrient elements such as phosphorus, potassium and the like, thereby being beneficial to the growth of crops.
In a further embodiment of the present invention, there is provided the use of the above-described mechanical pulp for the preparation of primary coloured wrapping paper, paper based materials and/or the use of fertilizers for promoting crop growth.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
The biological enzyme is obtained from Shandong Longkote enzyme preparation Co., Ltd, and Novexin biological enzyme preparation China Co.
Embodiment 1 method for preparing biomechanical unbleached pulp by wheat straw and fully utilizing byproducts
The method comprises the following steps:
(1) the air-dried wheat straw which is physically selected and dedusted is cut into standby raw materials with the length of 3cm, and the straws which can not be used as the standby raw materials (such as rotten straws) are collected.
(2) Putting the standby raw materials into a normal-temperature processor or a reaction kettle, performing warm water and alkaline complex enzyme action treatment on wheat straw according to a liquid ratio of 1:5kg/L, adjusting the pH value with KOH in the treatment process to enable the pH value of the wheat straw to be 8, controlling the treatment time to be 90min, controlling the temperature to be 50 ℃, controlling the enzyme dosage to be 100IU/mL, and controlling the enzyme activity ratio of alkaline xylanase, alkaline cellulase and alkaline pectinase to be 8:3: 2; and collecting the wastewater generated in the enzyme-alkali co-treatment stage.
(3) And (3) taking out the wheat straw treated in the step (2), further treating and softening the wheat straw by using hot alkali (KOH) water vapor with the pH value of 14 and the temperature of 110 ℃ for 60min, and dissolving out partial substances such as hemicellulose, lignin, pectin and the like.
(4) And (4) grinding the wheat straw treated in the step (3) into pulp in one or more sections, so that the beating degree is 41 DEG SR.
(5) Washing the ground pulp with water to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and mixing uniformly to obtain the bio-mechanical pulp; collecting the milling washing water;
mixing the waste water generated in the enzyme-alkali co-treatment stage and the pulping washing water according to the mass ratio of 2:5, treating, evaporating and concentrating by using a multi-effect evaporator to obtain residues, and recovering heat energy for the hot alkali water vapor treatment section in the step (3); and (2) mixing the residues with straws (such as rotten straws) which cannot be used as standby raw materials in the step (1) according to a mass ratio of 6:1, adjusting the pH to 7 by adopting phosphoric acid, and drying, crushing and granulating to obtain the biomass compound fertilizer.
Example 2 method for preparing biomechanical unbleached pulp from wheat straw
(1) The air-dried wheat straw which is physically selected and dedusted is cut into 4cm long standby raw materials, and the straw which can not be used as the standby raw materials (such as rotten straw) is collected.
(2) Putting the standby raw materials into a normal-temperature processor or a reaction kettle, carrying out warm water and alkaline complex enzyme action treatment on wheat straw according to a liquid ratio of 1:4kg/L, adjusting the pH value by using KOH in the treatment process to ensure that the pH value of the wheat straw water content is 9, controlling the treatment time to be 60min, the temperature to be 55 ℃, the enzyme dosage to be 30IU/mL, and the enzyme activity ratio of alkaline xylanase, alkaline cellulase and alkaline pectinase to be 10:4:3, and collecting wastewater generated in an enzyme-alkali co-treatment stage;
(3) and (3) taking out the wheat straw treated in the step (2), further treating and softening the wheat straw by using hot alkali (KOH) water vapor with the pH value of 13 and the temperature of 120 ℃ for 10min, and dissolving out partial substances such as hemicellulose, lignin, pectin and the like.
(4) And (4) grinding the wheat straw treated in the step (3) into pulp in one or more sections to make the beating degree of the pulp be 40-degree SR.
(5) Washing the ground pulp with water to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and mixing uniformly to obtain the bio-mechanical pulp; collecting the milling washing water;
mixing the waste water generated in the enzyme-alkali co-treatment stage and the pulping washing water according to the mass ratio of 2:3, treating, evaporating and concentrating by using a multi-effect evaporator to obtain residues, and recovering heat energy for the hot alkali water vapor treatment section in the step (3); and (2) mixing the residues with straws (such as rotten straws) which cannot be used as standby raw materials in the step (1) according to a mass ratio of 3:1, adjusting the pH to 7 by adopting phosphoric acid, and drying, crushing and granulating to obtain the biomass compound fertilizer.
Example 3 method for preparing biomechanical unbleached pulp from wheat straw
(1) The air-dried wheat straw which is physically selected and dedusted is cut into 5 cm-long standby raw materials, and the straws (such as rotten straws) which can not be used as the standby raw materials are collected.
(2) Putting the standby raw materials into a normal-temperature processor or a reaction kettle, performing warm water and alkaline complex enzyme action treatment on wheat straw according to a liquid ratio of 1:6kg/L, adjusting the pH value with KOH in the treatment process to enable the pH value of the water content of the wheat straw to be 8, controlling the treatment time to be 60min, controlling the temperature to be 50 ℃, controlling the enzyme dosage to be 80IU/mL, and controlling the enzyme activity ratio of alkaline xylanase, alkaline cellulase and alkaline pectinase to be 10:4: 3; and collecting the wastewater generated in the enzyme-alkali co-treatment stage.
(3) And (3) taking out the wheat straw treated in the step (2), further treating and softening the wheat straw by using hot alkali (KOH) water vapor with the pH value of 12 and the temperature of 100 ℃ for 30min, and dissolving out partial substances such as hemicellulose, lignin, pectin and the like.
(4) And (4) grinding the wheat straw treated in the step (3) into pulp in one or more sections to make the pulp degree of the wheat straw 38 degrees SR.
(5) Washing the ground pulp with water to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and mixing uniformly to obtain the bio-mechanical pulp; collecting the milling washing water;
mixing the waste water generated in the enzyme-alkali co-treatment stage and the pulping washing water according to the mass ratio of 2:5, treating, evaporating and concentrating by using a multi-effect evaporator to obtain residues, and recovering heat energy for the hot alkali water vapor treatment section in the step (3); and (2) mixing the residues with straws (such as rotten straws) which cannot be used as standby raw materials in the step (1) according to a mass ratio of 2:7, adjusting the pH to 7 by adopting phosphoric acid, and drying, crushing and granulating to obtain the biomass compound fertilizer.
Experimental example 1: the method is the same as the example 1, and has the difference that the dosage proportion of the alkaline compound enzyme is adjusted, specifically, the enzyme activity proportion of the alkaline xylanase, the alkaline cellulase and the alkaline pectinase is controlled to be 12:5:2, and the total dosage is 100 IU/mL.
Experimental example 2: the method is the same as the example 1, and has the difference that the dosage proportion of the alkaline compound enzyme is adjusted, specifically, the enzyme activity proportion of the alkaline xylanase, the alkaline cellulase and the alkaline pectinase is controlled to be 11:4:1.5, and the total dosage is 100 IU/mL.
Experimental example 3: the method is the same as the example 1, and is characterized in that the mass ratio of the waste water generated in the enzyme-alkali co-treatment stage to the pulping washing water is controlled to be 2: 1.
experimental example 4: the method is the same as the embodiment 1, and is characterized in that the mass ratio of the waste water generated in the enzyme-alkali co-treatment stage to the pulping washing water is controlled to be 1: 6.
experimental example 5: the method is the same as example 1, except that the mass ratio of the residue to the straw which cannot be used as a standby material in step (1) is controlled to be 2: 1.
Experimental example 6: the method is the same as example 1, except that the mass ratio of the residue to the straw which cannot be used as a standby material in step (1) is controlled to 1: 3.
Effect verification：
1. Table 1 shows a comparison of the physical properties of the pulps prepared in example 1 and experimental examples 1 and 2, and it can be seen that the physical properties of the respective constituent pulps are better, and the requirements for producing natural-color wrapping paper and paper-based materials are met. Examples 3-6 the physical properties of the resulting slurry were the same as those of example 1.
TABLE 1 determination of the Properties of the different methods of biomechanical slurries
2. Example 1 and Experimental examples 1-6 detection of fertilizer efficiency of biomass compound fertilizer
(1) Corn pot test
The results of the experiment in which the biomass compound fertilizer prepared in example 1 and experimental examples 1 to 6 was applied to potted corn and the biomass compound fertilizer (3g/kg soil) was applied to the seedling stage of corn are shown in table 2, which indicates that both example 1 and experimental examples 1 to 6 increase the biomass of corn compared to the control group CK without fertilizer application, and the effect is the best in example 1.
TABLE 2
(2) Wheat potting test
The results of experiments in which the biomass compound fertilizers prepared in examples 1 and 1 to 6 were applied to potted wheat and the biomass compound fertilizers (5g/kg soil) were applied to the seedling stage of the wheat are shown in table 3, which indicates that both examples 1 and 1 to 6 increase the biomass of the wheat as compared with the control group CK without fertilization, wherein the effect is the best in example 1.
TABLE 3
Examples of the invention
Biomass (g/basin)
Increase (%)
CK
8.69
-
Example 1
10.52
21.1
Experimental example 1
9.47
9.0
Experimental example 2
9.32
7.2
Experimental example 3
9.86
13.5
Experimental example 4
9.79
12.7
Experimental example 5
9.59
10.4
Experimental example 6
9.21
6.0
3. Example 1, Experimental examples 1-6 detection of storage stability of Biomass Compound fertilizers
The caking problem affects the appearance quality of the compound fertilizer and brings inconvenience to the transportation and application of the compound fertilizer, so that the storage stability (anti-caking performance) of the prepared biomass compound fertilizer is tested by a briquetting method, 50g of compound fertilizer samples are filled in a circular ring under the conditions of 50 ℃ of temperature, 147N of pressure and 15 days, and the test result is shown in table 4. It can be seen that the biomass compound fertilizer prepared in example 1 of the present application has the highest storage stability, which is superior to the biomass compound fertilizers prepared in experimental examples 1-6.
TABLE 4
Examples of the invention
Shear force (N)
Blocking prevention Rate (%)
Example 1
27.51
63.1
Experimental example 1
38.57
48.3
Experimental example 2
41.72
44.1
Experimental example 3
49.34
33.9
Experimental example 4
45.29
39.3
Experimental example 5
35.25
52.8
Experimental example 6
42.83
42.6
Note: the blocking resistance was (blank shear force-sample shear force)/blank shear force × 100%, and the blank shear force was 74.62N.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.