A multi-source coal-based solid waste soil conditioner for alkalization and its processing method

Abstract

The present invention discloses a multi-source coal-based solid waste alkalized soil conditioner and its processing method, belonging to the technical field of alkalized soil conditioners. The multi-source coal-based solid waste alkalized soil conditioner comprises raw materials with the following mass percentages: 38-45% desulfurized gypsum, 25-30% fly ash, 18-25% furfural residue, 0.5-3% compound microbial inoculum, and the balance being modified coal gangue. The multi-source coal-based solid waste alkalized soil conditioner prepared by the present invention can significantly reduce the soil pH and alkalinity, improve the soil structure, increase the soil fertility, and provide good soil conditions for crop growth.

Description

Technical Field

[0001] The invention belongs to the technical field of alkalizing soil conditioners, and in particular relates to a multi-source coal-based solid waste alkalizing soil conditioner and a processing method thereof. Background Art

[0002] The area of ​​saline-alkali land in my country is about 1.5 billion mu, which is widely distributed throughout the country. Among them, there are large areas of alkaline soil in Ningxia. The soil is heavy and swells when absorbing water. It is impermeable, easy to compact when dry, and has poor permeability. The organic matter content and soil fertility of alkaline soil are very low. With the rapid development of the economy and society, the amount of cultivated land has shown a rigid downward trend, and it is more difficult to keep the 1.8 billion mu of cultivated land red line. The overall quality of cultivated land is not high and is seriously degraded in some areas. At the same time, the reserve resources of cultivated land are limited, and it is difficult to reclaim and utilize most of the reserve resources of cultivated land. Therefore, the rational development of saline-alkali land is of great significance to the expansion, quality improvement and efficiency improvement of cultivated land resources.

[0003] Regarding saline-alkali soil conditioners, a large number of research results have emerged at home and abroad. For example, the improver in the invention titled "A saline-alkali soil conditioner and its preparation method" disclosed in CN201110050644 is made of citric acid, maleic acid acrylic acid copolymer, sodium polyacrylate, fatty alcohol polyoxyethylene ether and water; the improver in the invention titled "A biological drip irrigation saline-alkali soil conditioner and its preparation method" disclosed in CN201610860371.6 is made of amino acids, potassium humate, urea, etc.; the improver in the invention titled "A pH controlled release microcapsule polymer saline-alkali soil conditioner and its preparation method" disclosed in CN201910192704.6 is mainly made of organic polymers, organic solvents, surfactants, etc. These products are mainly soil conditioners prepared using polymer organic matter, and the raw material cost is relatively high.

[0004] At present, the saline-alkali soil conditioner with organic polymer as raw material has the problem of high cost in large-scale application. If the soil conditioner can be prepared with local industrial and agricultural waste as the main raw material, it can not only make use of industrial and agricultural waste as a resource, but also improve the local saline-alkali land as a reserve arable land resource, which has good ecological and social and economic benefits. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention proposes a multi-source coal-based solid waste alkalizing soil conditioner and a processing method thereof, which can improve the physical and chemical properties of alkalized soil while reducing costs, and utilize industrial and agricultural waste as resources.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-source coal-based solid waste alkalized soil conditioner, comprising raw materials with the following mass percentages: 38-45% desulfurized gypsum, 25-30% fly ash, 18-25% furfural residue, 0.5-3% compound microbial inoculum, and the balance being modified coal gangue.

[0008] The desulfurized gypsum in the alkalized soil conditioner of the present invention is mainly a by-product of the wet desulfurization process in coal-fired power plants. Its main component is the same as that of natural gypsum, which is calcium sulfate dihydrate, with a content of more than 85%. The desulfurized gypsum also contains components such as silicon dioxide, sodium oxide, calcium carbonate, calcium sulfite, limestone, calcium chloride, and magnesium chloride. Compared with other gypsum powders, desulfurized gypsum powder has the characteristics of being renewable, having a small particle size, stable composition, low content of harmful impurities, and high purity. The calcium ions in the desulfurized gypsum can exchange with the sodium ions in the alkalized soil colloid, and after irrigation, the exchanged sodium ions flow away with the water, reducing both the soil pH and the alkalinity.

[0009] The fly ash in the alkalized soil conditioner of the present invention is the fine ash captured from the flue gas after coal combustion and is the main solid waste discharged from coal-fired power plants. With the rapid development of industry, the discharge of fly ash from coal-fired power plants increases year by year. If a large amount of fly ash is not treated, it will cause dust pollution to the environment. In order to better protect the environment, the resource utilization of fly ash is the main way and development trend. Fly ash is mainly composed of porous particles. After being applied to alkalized soil, it can increase the porosity, reduce the bulk density, and effectively prevent the appearance of alkali patches on the soil surface. The porous fly ash has a certain adsorption property and has a certain water retention function. At the same time, fly ash contains various elemental components, and some elements are beneficial to improving the effectiveness of soil phosphorus and increasing the contents of trace elements such as iron, manganese, zinc, boron, and copper in the soil, promoting the growth and development of crops.

[0010] The furfural residue in the alkalized soil conditioner of the present invention is a biomass waste generated by the hydrolysis of pentosan components in biomass substances such as corncobs, cornstalks, rice husks, cottonseed hulls, and agricultural and sideline product processing residues to produce furfural. The furfural residue is acidic and can neutralize the base ions in the soil, reducing the soil pH and alkalinity after irrigation. At the same time, as a biomass waste, the furfural residue contains a large amount of cellulose, hemicellulose, and lignin, and the particles are loose. When applied to solonetz, it can reduce the soil bulk density. In addition, the organic matter content of the furfural residue can reach more than 76%, which has the effect of reducing the soil bulk density and increasing soil fertility.

[0011] Furthermore, the compound microbial inoculum is composed of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, and Streptococcus cinereus.

[0012] Further, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, and Streptococcus cinereus is 1∶(0.5 - 0.8)∶2∶1∶3∶1.5∶(0.1 - 0.4).

[0013] Further, the preparation method of the modified coal gangue is as follows: After crushing the coal gangue, it is calcined at 300 - 450 °C for 8 - 12 min, and then heated to 600 - 750 °C and continuously calcined for 3 - 5 min.

[0014] The present invention also provides a processing method of the multi-source coal-based solid waste alkaline soil conditioner described above, including the following steps:

[0015] Step 1: Weigh the raw materials by mass, and air-dry the desulfurized gypsum, fly ash, furfural residue, and modified coal gangue until the moisture content is 0 - 10%;

[0016] Step 2: Crush and sieve the air-dried desulfurized gypsum and furfural residue respectively;

[0017] Step 3: Mix the powdered desulfurized gypsum, fly ash, furfural residue, and modified coal gangue, stir at a speed of 300 - 430 rpm for 5 - 13 min, then add the compound microbial inoculant, and stir at a temperature of 30 - 35 °C and a speed of 1400 - 1600 rpm for 2 - 6 min to prepare the multi-source coal-based solid waste alkaline soil conditioner.

[0018] Further, the crushing in Step 2 is to crush to a particle size of 0.5 - 2 mm.

[0019] The present invention also provides an application of the multi-source coal-based solid waste alkaline soil conditioner described above in conditioning alkaline soil, and the application amount of the multi-source coal-based solid waste alkaline soil conditioner is 1.2 - 2.5 tons per mu.

[0020] The application method of the alkaline soil conditioner of the present invention is as follows: Before planting, after leveling the land, mix the above alkaline soil conditioner with organic fertilizer and spread it on the soil surface, then use a large rotary tiller to turn it over so that all the materials are evenly mixed with the 0 - 20 cm soil, and achieve the purpose of reducing alkali and desalting through irrigation.

[0021] Compared with the prior art, the present invention has the following advantages and technical effects:

[0022] The multi-source coal-based solid waste alkaline soil conditioner prepared by the present invention can significantly reduce the soil pH and alkalinity, improve the soil structure, increase the soil fertility, and provide good soil conditions for crop growth. Specific Embodiments

[0023] The various exemplary embodiments of the present invention will be described in detail below. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and implementation schemes of the present invention.

[0024] It should be understood that the terms described in the present invention are only for describing specific embodiments and are not used to limit the present invention. Additionally, for the numerical ranges in the present invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each intermediate value within any stated value or stated range, as well as each smaller range between any other stated value or intermediate value within the stated range, is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded from the range.

[0025] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention pertains. Although the present invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the said documents. In case of conflict with any incorporated document, the content of this specification shall prevail.

[0026] Without departing from the scope or spirit of the present invention, various improvements and changes can be made to the specific embodiments of the present invention specification, which are obvious to those skilled in the art. Other embodiments obtained from the specification of the present invention are obvious to those skilled in the art. The specification and examples of this application are merely exemplary.

[0027] Regarding the use of "comprising", "including", "having", "containing", etc. in this article, they are all open-ended terms, meaning including but not limited to.

[0028] Unless otherwise specified, the "parts" mentioned in the present invention are all in parts by mass.

[0029] All raw materials used in the following examples of the present invention are obtained commercially.

[0030] A multi-source coal-based solid waste alkaline soil conditioner, comprising raw materials in the following mass percentages: 38 - 45% desulfurized gypsum, 25 - 30% fly ash, 18 - 25% furfural residue, 0.5 - 3% compound microbial inoculum, and the balance being modified coal gangue.

[0031] The desulfurized gypsum in the soil conditioner for alkaline soil improvement of the present invention is mainly a by-product of the wet flue gas desulfurization process in coal-fired power plants. Its main components are the same as those of natural gypsum, namely calcium sulfate dihydrate, with a content of over 85%. The desulfurized gypsum also contains components such as silicon dioxide, sodium oxide, calcium carbonate, calcium sulfite, limestone, calcium chloride, and magnesium chloride. Compared with other gypsum powders, the desulfurized gypsum powder has the characteristics of being renewable, having a small particle size, stable composition, low content of harmful impurities, and high purity. The calcium ions in the desulfurized gypsum can exchange with the sodium ions in the alkaline soil colloid. After irrigation, the exchanged sodium ions flow away with the water, and both the soil pH and alkalinity are reduced.

[0032] The fly ash in the soil conditioner for alkaline soil improvement of the present invention is the fine ash captured from the flue gas after coal combustion and is the main solid waste discharged from coal-fired power plants. With the rapid development of industry, the discharge of fly ash from coal-fired power plants has been increasing year by year. If a large amount of fly ash is not treated, it will cause dust pollution to the environment. In order to better protect the environment, the resource utilization of fly ash is the main way and development trend. Fly ash is mainly composed of porous particles. After being applied to alkaline soil, it can increase the porosity, reduce the bulk density, and effectively prevent the appearance of alkali patches on the soil surface. The porous fly ash has a certain adsorption property and a certain water retention function. At the same time, fly ash contains various elemental components, and some elements are beneficial to improving the effectiveness of soil phosphorus and increasing the contents of trace elements such as iron, manganese, zinc, boron, and copper in the soil, thus promoting the growth and development of crops.

[0033] The furfural residue in the soil conditioner for alkaline soil improvement of the present invention is a biomass waste generated by hydrolyzing the pentosan component in biomass substances such as corncobs, cornstalks, rice husks, cottonseed hulls, and agricultural and sideline product processing residues to produce furfural. The furfural residue is acidic and can neutralize the base ions in the soil. After irrigation, it reduces the soil pH and alkalinity. At the same time, as a biomass waste, the furfural residue contains a large amount of cellulose, hemicellulose, and lignin, and the particles are loose. When applied to solonetz soil, it can reduce the soil bulk density. In addition, the organic matter content of the furfural residue can reach over 76%, which has the effect of reducing the soil bulk density and increasing soil fertility.

[0034] In some preferred embodiments, the compound microbial inoculant is composed of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, and Streptococcus cinereus, and the mass ratio is 1∶(0.5 - 0.8)∶2∶1∶3∶1.5∶(0.1 - 0.4). Preferably, it is 1∶0.6∶2∶1∶3∶1.5∶0.3. The present invention rationally controls the dosage relationship of each inoculant, and each inoculant complements each other, effectively compounding the soil repair ability of the microbial inoculant.

[0035] In some preferred embodiments, the preparation method of the modified coal gangue is as follows: After crushing the coal gangue, it is calcined at 300 - 450 °C for 8 - 12 minutes, and then heated to 600 - 750 °C and continuously calcined for 3 - 5 minutes. Crushing the coal gangue is to break through the outer film, thereby increasing its specific surface area and porosity. Then, through the treatment method of first low temperature and then high temperature, the carbon volume of the coal gangue expands and the micropores increase. When the composite microbial inoculant meets the multi-microporous coal gangue, it will increase the loading amount of the microbial inoculant, thereby effectively carrying the microbial inoculant into the soil, increasing the probability of contact between the microbial inoculant and the soil, and enhancing the repair ability.

[0036] The present invention also provides a processing method of the multi-source coal-based solid waste alkaline soil conditioner described above, including the following steps:

[0037] Step 1: Weigh the raw materials by mass, and air-dry the desulfurized gypsum, fly ash, furfural residue and modified coal gangue until the moisture content is 0 - 10%;

[0038] Step 2: Crush and sieve the air-dried desulfurized gypsum and furfural residue respectively;

[0039] Step 3: Mix the powdered desulfurized gypsum, fly ash, furfural residue and modified coal gangue, stir at a speed of 300 - 430 rpm for 5 - 13 minutes, then add the composite microbial inoculant, and stir at a temperature of 30 - 35 °C and a speed of 1400 - 1600 rpm for 2 - 6 minutes to prepare the multi-source coal-based solid waste alkaline soil conditioner.

[0040] In some preferred embodiments, the crushing in Step 2 is to crush to a particle size of 0.5 - 2 mm.

[0041] The present invention also provides an application of the multi-source coal-based solid waste alkaline soil conditioner described above in conditioning alkaline soil, and the application amount of the multi-source coal-based solid waste alkaline soil conditioner is 1.2 - 2.5 tons per mu.

[0042] The application method of the alkaline soil conditioner of the present invention is that before planting, after leveling the land, mix the above alkaline soil conditioner with organic fertilizer and spread it on the soil surface, and then use a large rotary tiller to turn it over so that all materials are evenly mixed with the 0 - 20 cm soil, and achieve the purpose of reducing alkalinity and desalting through irrigation.

[0043] When using the multi-source coal-based solid waste alkaline soil conditioner prepared by the present invention, the application amount can be adjusted according to the soil alkalinity and pH. Specifically:

[0044] According to the classification of alkalized soil in Chinese saline soil, for severely alkalized soil with 20% ≤ surface soil alkalization degree < 30% and pH ≥ 9.5, the application rate is 2.0 - 2.5 tons per mu; for moderately alkalized soil with 10% ≤ surface soil alkalization degree < 20% and 8.5 ≤ pH < 9.5, the application rate is 1.5 - 2.0 tons per mu; for slightly alkalized soil with 5% ≤ surface soil alkalization degree < 10% and pH < 8.5, the application rate is 1.2 - 1.5 tons per mu.

[0045] The following examples are further illustrations of the technical solutions of the present invention.

[0046] In the following examples, the specific preparation method of the modified coal gangue is as follows: The coal gangue is crushed to 1.2 mm, then calcined at 400 °C for 10 min, heated to 680 °C at a rate of 5 °C / min, and then calcined for 3 min.

[0047] Example 1

[0048] A multi-source coal-based solid waste alkalized soil conditioner is composed of raw materials with the following mass percentages: 43% desulfurized gypsum, 25% fly ash, 20% furfural residue, 2% compound microbial inoculant (wherein, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, and Streptococcus cinereus is 1∶0.6∶2∶1∶3∶1.5∶0.3), and the balance is modified coal gangue.

[0049] The preparation method is as follows:

[0050] Step 1: Weigh the raw materials according to the above masses, and air-dry the desulfurized gypsum, fly ash (Class II fly ash), furfural residue, and modified coal gangue to a moisture content of 8%;

[0051] Step 2: Respectively crush and sieve the air-dried desulfurized gypsum and furfural residue to a particle size of 1.5 mm;

[0052] Step 3: Mix the powdered desulfurized gypsum, fly ash, furfural residue, and modified coal gangue, stir at a speed of 380 rpm for 8 min, then add the compound microbial inoculant, and stir at a temperature of 35 °C and a speed of 1500 rpm for 4 min to obtain the multi-source coal-based solid waste alkalized soil conditioner.

[0053] Example 2

[0054] A multi-source coal-based solid waste alkaline soil conditioner is composed of raw materials with the following mass percentages: 38% desulfurized gypsum, 27% fly ash, 23% furfural residue, 0.5% compound microbial inoculum (wherein, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is 1:0.6:2:1:3:1.5:0.3), and the balance is modified coal gangue.

[0055] The preparation method is the same as that of Example 1.

[0056] Example 3

[0057] A multi-source coal-based solid waste alkaline soil conditioner is composed of raw materials with the following mass percentages: 42% desulfurized gypsum, 26% fly ash, 20% furfural residue, 2.5% compound microbial inoculum (wherein, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is 1:0.6:2:1:3:1.5:0.3), and the balance is modified coal gangue.

[0058] The preparation method is the same as that of Example 1.

[0059] Example 4

[0060] A multi-source coal-based solid waste alkaline soil conditioner is composed of raw materials with the following mass percentages: 40% desulfurized gypsum, 25% fly ash, 24% furfural residue, 3% compound microbial inoculum (wherein, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is 1:0.6:2:1:3:1.5:0.3), and the balance is modified coal gangue.

[0061] The preparation method is the same as that of Example 1.

[0062] Example 5

[0063] A multi-source coal-based solid waste alkaline soil conditioner is composed of raw materials with the following mass percentages: 41% desulfurized gypsum, 26% fly ash, 24% furfural residue, 1% compound microbial inoculum (wherein, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is 1:0.6:2:1:3:1.5:0.3), and the balance is modified coal gangue.

[0064] The preparation method is the same as that of Example 1.

[0065] Example 6

[0066] A multi-source coal-based solid waste alkalized soil conditioner is composed of raw materials with the following mass percentages: 38% desulfurized gypsum, 25% fly ash, 25% furfural residue, 1.5% compound microbial inoculum (wherein, the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is 1∶0.6∶2∶1∶3∶1.5∶0.3), and the balance is modified coal gangue.

[0067] The preparation method is the same as that of Example 1.

[0068] Example 7

[0069] Same as Example 1, except that the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is 1∶0.5∶2∶1∶3∶1.5∶0.1.

[0070] Comparative Example 1

[0071] Same as Example 1, except that the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum and Streptococcus cinereus is adjusted to 1∶1∶1∶1∶1∶1∶1.

[0072] Comparative Example 2

[0073] Same as Example 1, except that the compound microbial inoculum is adjusted to be compounded by Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, Streptococcus cinereus and Bacillus pumilus according to the mass ratio of 1∶0.6∶2∶1∶3∶1.5∶0.3∶1.

[0074] Comparative Example 3

[0075] Same as Example 1, except that the modified coal gangue is replaced with attapulgite.

[0076] Comparative Example 4

[0077] Same as Example 1, except that the preparation method of the multi-source coal-based solid waste alkalized soil conditioner is as follows:

[0078] Step 1: Weigh the raw materials according to the above mass, and air-dry the desulfurized gypsum, fly ash (Class II fly ash), furfural residue and modified coal gangue until the moisture content is 8%;

[0079] Step 2: Crush and sieve the air-dried desulfurized gypsum and furfural residue to a particle size of 1.5 mm;

[0080] Step 3: Mix powdered desulfurized gypsum, fly ash, furfural residue, and modified coal gangue, and then mix with a compound microbial inoculant. Stir at 800 rpm for 10 min at room temperature to prepare a multi-source coal-based solid waste alkalized soil conditioner.

[0081] Application Example 1

[0082] Application method of the alkalized soil conditioner:

[0083] (1) Application period: Autumn of the year before planting.

[0084] (2) Application method: After leveling the land, mix the above-mentioned alkalized soil conditioner with organic fertilizer and spread it on the soil surface. Rototill with a large rotary tiller to evenly mix all the materials with the 0 - 20 cm soil layer. Achieve the purpose of reducing alkalinity and desalination through irrigation. The interval between irrigation is 2 weeks, and the irrigation amount per time is 100 m 3 / mu, and irrigate 4 times in total. Irrigate once a month 2 months later, with the irrigation amount of 100 m 3 / mu, and the experiment ends after 12 months.

[0085] Apply the alkalized soil conditioners prepared in Examples 1 - 7 and Comparative Examples 1 - 4 to the soil according to the above method. Use the plot without adding the alkalized soil conditioner as the control group (apply organic fertilizer normally, and the amount of organic fertilizer is the same as that in the example group and the comparative example group. It should be noted that the organic fertilizer will not affect the effect of the alkalized soil conditioner, so the fertilizer amount is not limited here, and the same amount for each group of experiments is sufficient). Set 3 replicated plots for each experimental group and record the average value. The application rate of the alkalized soil conditioner is 2 tons / mu, and the soil is severely alkalized soil (soil surface alkalinity = 28.3%, pH = 9.8, bulk density = 1.62 g / cm 3 , salt content = 3.5‰), and the results are shown in Table 1.

[0086] Table 1

[0087] Alkalinity / % Salt content / ‰ <![CDATA[Bulk density (g / cm 3 )]]> Porosity / % pH Control group 25.36 3.15 1.52 40.32 9.4 Example 1 11.34 1.21 1.29 52.89 8.28 Example 2 13.57 1.34 1.32 52.32 8.38 Example 3 13.41 1.37 1.39 50.64 8.35 Example 4 14.02 1.40 1.40 49.00 8.42 Example 5 12.67 1.32 1.34 51.21 8.32 Example 6 11.87 1.35 1.27 52.07 8.29 Example 7 11.56 1.23 1.30 52.55 8.30 Comparative example 1 17.07 1.68 1.48 46.03 8.68 Comparative example 2 13.09 1.41 1.33 49.45 8.31 Comparative example 3 16.78 2.04 1.44 47.01 8.65 Comparative example 4 13.32 1.55 1.43 47.34 8.42

[0088] It can be seen from Table 1 that the soil salt content, soil bulk density, and pH value of the soil conditioned by the alkalized soil conditioner prepared in the examples of the present invention decrease, while the porosity increases. Although the soil conditioned by the alkalized soil conditioners prepared in Comparative Example 1 and Comparative Example 3 has been improved compared to the control group, the effect is still worse than that of the examples.

[0089] Application Example 2

[0090] The exploration of different types of saline-alkali soil was carried out in the same method as in Application Example 1, with the difference that the soil conditioner prepared in Example 1 was used in moderately alkalized soil (soil surface alkalinity = 18%, pH = 9.18, salt content = 2.1‰, bulk density = 1.51). The application rate remained unchanged at 2 tons per mu, and the results are shown in Table 2.

[0091] Table 2 (Please adjust the corresponding data in the text according to the modified data)

[0092] Alkalinity / % Salt content / ‰ <![CDATA[Bulk density (g / cm 3 )]]> Porosity / % pH Control group 15.89 1.58 1.43 43.57 8.78 Example 1 8.59 0.95 1.34 56.81 8.28

[0093] It can be seen from Table 2 that the effect of the alkalized soil conditioner prepared in Example 1 in conditioning slightly alkalized soil is weaker than that in conditioning severely alkalized soil. Specifically, for example, the alkalinity in Example 1 decreased by 46% compared with the control group, while the alkalinity in Example 1 in Application Example 1 decreased by 55% compared with the control group; the salt content in Example 1 decreased by 40% compared with the control group, while the salt content in Example 1 in Application Example 1 decreased by 61% compared with the control group; the bulk density in Example 1 decreased by 6% compared with the control group, while the bulk density in Example 1 in Application Example 1 decreased by 15% compared with the control group; the porosity in Example 1 increased by 23% compared with the control group, while the porosity in Example 1 in Application Example 1 increased by 24% compared with the control group; the pH value in Example 1 decreased by 6% compared with the control group, while the pH value in Example 1 in Application Example 1 decreased by 12% compared with the control group. This shows that soil conditioners with different raw material compositions need to be targeted at soils with different degrees of alkalization.

[0094] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-source coal-based solid waste soil conditioner for alkalization, characterized in that, Raw materials including the following mass percentages: 38 - 45% desulfurized gypsum, 25 - 30% fly ash, 18 - 25% furfural residue, 0.5 - 3% compound microbial inoculum, and the balance being modified coal gangue; The compound microbial inoculum is composed of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, and Streptococcus cinereus, and the mass ratio of Bacillus subtilis, Bacillus megaterium, Bacillus licheniformis, Bacillus amyloliquefaciens, Pseudomonas cepacia, Lactobacillus plantarum, and Streptococcus cinereus is 1∶(0.5 - 0.8)∶2∶1∶3∶1.5∶(0.1 - 0.4); The preparation method of the modified coal gangue is as follows: After crushing the coal gangue, it is calcined at 300 - 450°C for 8 - 12 min, and then heated to 600 - 750°C and continuously calcined for 3 - 5 min; The processing method of the multi-source coal-based solid waste soil conditioner for alkalized soil includes the following steps: Step 1: Weigh the raw materials by mass, and air-dry the desulfurized gypsum, fly ash, furfural residue, and modified coal gangue until the water content is 0 - 10%; Step 2: Respectively crush and sieve the air-dried desulfurized gypsum and furfural residue; Step 3: Mix the powdered desulfurized gypsum, fly ash, furfural residue, and modified coal gangue, stir at a speed of 300 - 430 rpm for 5 - 13 min, then add the compound microbial inoculum, and stir at a temperature of 30 - 35°C and a speed of 1400 - 1600 rpm for 2 - 6 min to obtain the multi-source coal-based solid waste soil conditioner for alkalized soil.

2. A processing method of the multi-source coal-based solid waste soil conditioner for alkalizing soil as described in claim 1, characterized in that, Including the following steps: Step 1: Weigh the raw materials by mass, and air-dry the desulfurized gypsum, fly ash, furfural residue, and modified coal gangue until the water content is 0 - 10%; Step 2: Respectively crush and sieve the air-dried desulfurized gypsum and furfural residue; Step 3: Mix the powdered desulfurized gypsum, fly ash, furfural residue, and modified coal gangue, stir at a speed of 300 - 430 rpm for 5 - 13 min, then add the compound microbial inoculum, and stir at a temperature of 30 - 35°C and a speed of 1400 - 1600 rpm for 2 - 6 min to obtain the multi-source coal-based solid waste soil conditioner for alkalized soil.

3. Use of a multi-source coal-based solid waste alkaline soil conditioner as described in claim 1 in conditioning alkaline soil, characterized in that, The application rate of the multi-source coal-based solid waste soil conditioner for alkalized soil is 1.2 - 2.5 tons per mu.