An alkali salt precipitant, its preparation method and application

Abstract

The present invention provides an alkali-salt precipitant and its preparation method and application, which belong to the technical field of saline-alkali soil improvement. The alkali-salt precipitant of the present invention comprises the following raw materials in parts by weight: 20-25 parts of humic acid, 20-25 parts of modified medical stone, 18-23 parts of tribulus terrestris powder, 7-10 parts of small bone powder, 5-7 parts of barium sulfate, 3-5 parts of polyacrylamide, and 3-5 parts of composite microbial preparation. The present invention adopts a technology combining biological means and chemical means to improve saline-alkali land, so that the EPS value of the soil is reduced from 15.2% to 5.1% at most, and the pH value of the soil is also reduced from the original 9.3 to a normal level, and the saline-alkali soil is converted from severe salinization to mild salinization, that is, the alkali-salt precipitant provided by the present invention has a very significant effect on the improvement of saline-alkali soil.

Description

Technical Field

[0001] The present invention relates to the technical field of saline-alkali soil improvement, and in particular to an alkali-salt sedimentation agent, a preparation method thereof, and an application thereof. Background Art

[0002] Soil salinization is a global land resource issue. China has a vast area of saline-alkali land, widespread distribution, and diverse types. Timely management of saline-alkali land resources and improvement of the ecological environment play a vital role in the sustainable economic, social, and ecological development of local regions. It is also a key measure for promoting the sustainable development of Chinese agriculture. Soil salinization is an environmental geological phenomenon that not only disrupts ecosystems and affects agricultural production, but also leads to economic decline in saline-alkali regions. Soil salinization is caused by both natural and human factors. Soil salinization is caused by the dissolution of soluble salts into the soil and their accumulation in the surface layer. Under normal circumstances, groundwater and soil water maintain a certain dynamic balance, and the ion content in the surface soil is relatively stable. Once this stable state is disrupted, saline-alkali land is easily formed. Salt in saline-alkali land accumulates within and on the soil surface, deteriorating soil physical and chemical properties, such as reduced structural adhesion, high soil bulk density, poor air permeability, and reduced aerobic microbial activity. This further exacerbates the accumulation of salt in the surface soil, inhibiting plant growth and development, ultimately leading to plant death and reduced crop yields.

[0003] To address the problem of soil salinization, my country's existing improvement technologies include: water conservancy improvement measures such as establishing a complete drainage and irrigation system, reducing soil salinity through irrigation and flood diversion, combining wells, ditches and canals, and using machine wells to extract groundwater for irrigation, leaching salt in the surface soil to below the cultivated layer, while lowering the groundwater level and reducing salt accumulation in the soil surface; agricultural technology improvement measures such as deep plowing, loosening the cultivated layer, cutting off soil capillaries, reducing soil moisture evaporation, effectively controlling soil salt return, leveling the land to allow water to infiltrate evenly, and increasing rainfall salt and The effect of irrigation to wash away salt, prevent soil patchy salinization, increase the application of organic fertilizers, etc.; chemical improvement measures such as the use of improvers such as calcium sulfate, gypsum, humic acid, etc., neutralize soil pH, improve soil structure, apply special fertilizers such as urea phosphate, humic acid, etc., increase humus in the soil, and reduce the damage of salt to plants; biological improvement measures such as planting salt-tolerant plants: such as alfalfa, ryegrass, etc., absorb and transfer salt through their own growth metabolism, gradually improve the soil environment, afforestation: improve soil fertility, improve the microclimate of farmland, reduce surface water evaporation, and inhibit salt return.

[0004] Judging from the saline-alkali land improvement methods currently commonly used in China, the main problems are single function, high investment cost, slow improvement speed of 3-5 years to be effective, poor salt reduction effect, and difficulty in comprehensive promotion. Summary of the Invention

[0005] In view of this, the present invention provides an alkali salt precipitant, comprising the following raw materials in parts by weight: 20-25 parts of humic acid, 20-25 parts of modified medical stone, 18-23 parts of Tribulus terrestris powder, 7-10 parts of Ostreae chinensis powder, 5-7 parts of barium sulfate, 3-5 parts of polyacrylamide, and 3-5 parts of a composite microbial preparation.

[0006] Preferably, the humic acid is selected from at least one of fulvic acid, humic acid and palmitic acid.

[0007] Preferably, the preparation method of the modified medical stone comprises: crushing the medical stone to a particle size of 20-50 μm, then placing the medical stone in hydrochloric acid and applying ultrasonic wave-assisted soaking for 3-4 hours, wherein the ultrasonic wave has an ultrasonic wave power of 60-100 W, washing with deionized water, then roasting at 350-420° C. for 4-6 hours, cooling to room temperature and soaking in hydrogen peroxide with a mass concentration of 8-10% for 3-4 hours, then washing with deionized water until neutral and drying, then adding cetyltrimethylammonium bromide solution equivalent to 3-5% by weight of the medical stone and 2-3% of polyethylene glycol, stirring at a speed of 2000-3000 r / min for 10-20 minutes, filtering and drying to obtain the modified medical stone.

[0008] Preferably, the particle size of the Tribulus terrestris powder is 2-5 mm and the moisture content is 2-5%.

[0009] Preferably, the particle size of the small bone powder is 2.5-6 mm, and the moisture content is 2-5%.

[0010] Preferably, the polyacrylamide is anionic polyacrylamide.

[0011] Preferably, the composite microbial preparation comprises Chaetomium, Trichoderma and Cryptococcus.

[0012] Preferably, the mass ratio of Chaetomium, Trichoderma and Cryptococcus in the composite microbial preparation is 2-5:1-3:0.1-0.5.

[0013] The invention also provides a preparation method of the alkali salt precipitant, which comprises the steps of uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, scutellaria baicalensis powder, barium sulfate and polyacrylamide in proportion, granulating, screening, drying and cooling.

[0014] The alkali-salt sedimentation agent provided by the present invention can be used to improve saline-alkali land with high salinity, high alkalinity, no sedimentation, poor soil permeability, and the like.

[0015] Compared with the existing technology, the present invention has the following beneficial effects: the present invention adopts a technology that combines biological means and chemical means to improve saline-alkali land, effectively regulates the physical and chemical properties of saline-alkali land, and can also improve the microenvironment in saline-alkali soil, enhance the disease resistance of crops, improve crop quality, and increase yield. The present invention combines modified medical stone with a composite microbial preparation to promote the exchange and release of metal ions in the soil, thereby reducing the salt content. The composite microorganisms carried by the porous carrier produce extracellular enzymes through metabolic activities, which have an adsorption and chelation effect, thereby mineralizing the salt in the soil, thereby achieving the effect of reducing the salinity of saline-alkali land. The composite microbial preparation added to the formula of the present invention can secrete acidic substances, which can effectively neutralize the alkaline components in the soil, and does not cause any harm to plants and the soil itself, which is in line with the future development direction of green agriculture. At the same time, the composite microbial preparation used in the present invention has a good preventive and therapeutic effect on crop diseases, and can effectively prevent and control the occurrence of crop seedling diseases. The tribulus terrestris powder, small sclerotium powder and humic acid added to the formula of the present invention have the effect of synergistically absorbing salt in the soil, reducing the salt content in saline-alkali land, and improving soil fertility. The present invention promotes the formation of soil aggregate structure, increases soil porosity, enhances soil water permeability and air permeability, balances pH value, facilitates salt leaching, and inhibits salt return. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a comparison chart of the ESP values of the soil after 60 days of using the alkali salt precipitants prepared in Examples 1-5 of the present invention and Comparative Examples 1-6.

[0017] Figure 2 This is a comparison chart of the pH values of the soil after 60 days of using the alkali salt precipitants prepared in Examples 1-5 of the present invention and Comparative Examples 1-6. DETAILED DESCRIPTION

[0018] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0019] Unless otherwise specified, the experimental methods or test methods described in the following examples are all conventional methods; the raw materials and auxiliary agents, unless otherwise specified, are all obtained from conventional commercial channels or prepared by conventional methods.

[0020] The invention provides an alkali salt precipitator. The alkali salt precipitator comprises the following raw materials in parts by weight: 20-25 parts of humic acid, 20-25 parts of modified medical stone, 18-23 parts of tribulus terrestris powder, 7-10 parts of scutellaria baicalensis powder, 5-7 parts of barium sulfate, 3-5 parts of polyacrylamide and 3-5 parts of a composite microbial preparation.

[0021] In the present invention, the alkali salt precipitant preferably comprises the following raw materials in parts by weight: 21-23 parts of humic acid, 21-23 parts of modified medical stone, 19-21 parts of Tribulus terrestris powder, 8-9 parts of Ostreae powder, 6-7 parts of barium sulfate, 4-5 parts of polyacrylamide, and 4-5 parts of composite microbial preparation.

[0022] In the present invention, the humic acid is selected from at least one of fulvic acid, humic acid, and fulvic acid, and the humic acid is preferably fulvic acid.

[0023] In the present invention, the preparation method of the modified medical stone comprises: crushing the medical stone to a particle size of 20-50 μm, then placing the medical stone in hydrochloric acid and applying ultrasonic wave-assisted soaking for 3-4 hours, wherein the ultrasonic wave has a power of 60-100 W, washing with deionized water, then roasting at 350-420° C. for 4-6 hours, cooling to room temperature, soaking in hydrogen peroxide with a mass concentration of 8-10% for 3-4 hours, then washing with deionized water until neutral, and drying, then adding cetyltrimethylammonium bromide solution equivalent to 3-5% by weight of the medical stone and 2-3% of polyethylene glycol, stirring at a speed of 2000-3000 r / min for 10-20 minutes, filtering, and drying to obtain the modified medical stone.

[0024] The present invention utilizes a modifier to carry out modification treatment on medical stone, greatly improving the absorption and dissolving function, ion exchange capacity and biological activity of medical stone. It can activate the calcium ions solidified in the soil, absorb and remove unnecessary sodium ions, accelerate the activation and decomposition of sparingly soluble phosphates in saline-alkali soils, contribute to the formation of soil aggregates, and suppress salt return. The modified medical stone reaches the effect of reducing salt in the soil by giving play to the ion exchange effect. In addition, the present invention's formula contains a large amount of carbon ions and hydrogen ions, wherein the hydrogen ions can react with the carbonate and bicarbonate radicals in the soil, play the effect of reducing soil acidity and alkalinity, and the carbon ions can improve the air permeability of the soil, promote the growth and development of crops, balance the soil pH value, and further reduce soil salinity.

[0025] In the present invention, the particle size of the Tribulus terrestris powder is 2-5 mm, preferably 3 mm, and the moisture content is 2-5%, preferably 3%.

[0026] In the present invention, the particle size of the small bone powder is 2.5-6 mm, preferably 3 mm, and the moisture content is 2-5%, preferably 3%.

[0027] In the present invention, the cooling includes but is not limited to natural cooling to room temperature.

[0028] Preferably, the polyacrylamide is anionic polyacrylamide. The anionic polyacrylamide used in the formula of the present invention easily reacts with water in the soil to form a viscous colloid, which plays a role in adjusting the permeability, porosity and moisture content of the soil, reshaping the soil structure, improving the stability of aggregates, reducing surface runoff, and promoting crop yields.

[0029] In the present invention, the composite microbial preparation comprises Chaetomium, Trichoderma and Cryptococcus, wherein the mass ratio of Chaetomium, Trichoderma and Cryptococcus is 2-5:1-3:0.1-0.5.

[0030] The inventors discovered that the composite microbial preparation obtained by compounding Chaetomium, Trichoderma and Cryptococcus in the above proportions can effectively promote the dissolution of nutrients in modified medical stone, which is beneficial to the absorption and utilization of crops. At the same time, the acidic substances produced in its metabolic activities can neutralize the alkalinity in the soil, balance the pH value, and help improve saline-alkali soil.

[0031] In the present invention, the Chaetomium is one or more of Chaetomium globosum, Chaetomium angularis, and Chaetomium spiralis, and the effective viable bacteria count in the powder of the Chaetomium is 8×10 9 CFU / g.

[0032] In the present invention, the Trichoderma is one or more of Trichoderma longibrachiatum, Trichoderma harzianum, and Trichoderma viride, and the effective viable bacteria count in the Trichoderma powder is 9×10 9 CFU / g.

[0033] In the present invention, the cryptococcus is at least one of Cryptococcus neoformans and Cryptococcus gattii, and the effective viable bacteria count in the cryptococcus powder is 8×10 9 CFU / g.

[0034] The invention also provides a preparation method of the alkali salt precipitant, which comprises the steps of uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, scutellaria baicalensis powder, barium sulfate and polyacrylamide in proportion, granulating, screening, drying and cooling.

[0035] The alkali-salt sedimentation agent provided by the present invention can be used to improve defects of saline-alkali land, such as high salinity, high alkalinity, no sedimentation, and poor soil permeability.

[0036] The application amount of the alkali salt sedimentation agent of the present invention is 50-150kg / hm 2 , adjust the application amount according to the actual soil conditions.

[0037] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] Example 1

[0039] An alkali salt sedimentation agent is composed of the following raw materials in parts by weight: 20 parts of fulvic acid, 20 parts of modified medical stone, 18 parts of Tribulus terrestris powder, 7 parts of Ostreae chinensis powder, 5 parts of barium sulfate, 3 parts of anionic polyacrylamide, and 3 parts of a composite microbial preparation;

[0040] The modified medical stone is prepared by the following steps: crushing the medical stone to a particle size of 20 μm, placing the medical stone in hydrochloric acid and simultaneously applying ultrasonic wave-assisted soaking for 3 hours, wherein the ultrasonic wave has a power of 60 W, washing with deionized water, and then roasting at 350° C. for 6 hours. After cooling to room temperature, soaking the medical stone in hydrogen peroxide with a mass concentration of 8% for 3 hours, washing the medical stone with deionized water until neutral, and drying the medical stone. Then, adding a cetyltrimethylammonium bromide solution with a weight percentage of 3% and polyethylene glycol with a weight percentage of 2% equivalent to the weight of the medical stone, stirring the medical stone at a speed of 2000 r / min for 20 minutes, filtering, and drying the medical stone to obtain the modified medical stone.

[0041] The particle size of the Tribulus terrestris powder is 2 mm and the moisture content is 3%;

[0042] The particle size of the small bone powder is 2.5 mm and the moisture content is 3%;

[0043] The composite microbial preparation consists of Chaetomium, Trichoderma and Cryptococcus in a mass ratio of 2:1:0.1.

[0044] The preparation method of the alkali salt precipitant comprises the following steps: uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, sclerotium sclerotium powder, barium sulfate and polyacrylamide in proportion, granulating, sieving, drying at 60° C. and cooling to room temperature.

[0045] Example 2

[0046] An alkali salt sedimentation agent is composed of the following raw materials in parts by weight: 25 parts of humic acid, 25 parts of modified medical stone, 23 parts of Tribulus terrestris powder, 10 parts of Ostreae chinensis powder, 7 parts of barium sulfate, 5 parts of anionic polyacrylamide, and 5 parts of a composite microbial preparation;

[0047] The modified medical stone is prepared by the following method: crushing the medical stone to a particle size of 50 μm, then placing the medical stone in hydrochloric acid while applying ultrasonic wave-assisted soaking for 4 hours, wherein the ultrasonic wave has a power of 100 W, washing with deionized water, then roasting at 420° C. for 6 hours, cooling to room temperature, soaking in hydrogen peroxide with a mass concentration of 10% for 4 hours, washing with deionized water until neutral, and then drying, adding a cetyltrimethylammonium bromide solution equivalent to 5% by weight of the medical stone and 3% of polyethylene glycol, stirring at a speed of 3000 r / min for 20 minutes, filtering, and drying to obtain the modified medical stone;

[0048] The particle size of the Tribulus terrestris powder is 5 mm and the moisture content is 5%;

[0049] The particle size of the small bone powder is 6mm and the moisture content is 5%;

[0050] The composite microbial preparation consists of Chaetomium, Trichoderma and Cryptococcus in a mass ratio of 5:3:0.5.

[0051] The preparation method of the alkali salt precipitant comprises the following steps: uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, sclerotium sclerotium powder, barium sulfate and polyacrylamide in proportion, granulating, sieving, drying at 60° C. and cooling to room temperature.

[0052] Example 3

[0053] An alkali salt sedimentation agent is composed of the following raw materials in parts by weight: 20 parts of humic acid, 20 parts of modified medical stone, 18 parts of Tribulus terrestris powder, 7 parts of Ostreae chinensis powder, 5 parts of barium sulfate, 3 parts of anionic polyacrylamide, and 3 parts of a composite microbial preparation;

[0054] The modified medical stone is prepared by the following method: crushing the medical stone to a particle size of 20 μm, then placing the medical stone in hydrochloric acid while applying ultrasonic wave-assisted soaking for 3 hours, wherein the ultrasonic wave has an ultrasonic power of 800 W, washing with deionized water, and then roasting at 380° C. for 6 hours. After cooling to room temperature, soaking the medical stone in 10% hydrogen peroxide solution for 4 hours, washing the solution with deionized water until neutral, and drying the solution. Then, adding 3% hexadecyltrimethylammonium bromide solution and 2% polyethylene glycol equivalent to the weight of the medical stone, stirring the solution at a speed of 3000 r / min for 20 minutes, filtering, and drying the solution to obtain the modified medical stone.

[0055] The particle size of the Tribulus terrestris powder is 3 mm and the moisture content is 3%;

[0056] The particle size of the small bone powder is 3mm and the moisture content is 4%;

[0057] The composite microbial preparation consists of Chaetomium, Trichoderma and Cryptococcus in a mass ratio of 3:2:0.3.

[0058] The preparation method of the alkali salt precipitant comprises the following steps: uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, sclerotium sclerotium powder, barium sulfate and polyacrylamide in proportion, granulating, sieving, drying at 60° C. and cooling to room temperature.

[0059] Example 4

[0060] An alkali salt sedimentation agent is composed of the following raw materials in parts by weight: 23 parts of fulvic acid, 22 parts of modified medical stone, 20 parts of Tribulus terrestris powder, 8 parts of Ostreae chinensis powder, 6 parts of barium sulfate, 4 parts of anionic polyacrylamide, and 4 parts of a composite microbial preparation;

[0061] The modified medical stone is prepared by the following steps: crushing the medical stone to a particle size of 30 μm, placing the medical stone in hydrochloric acid and simultaneously applying ultrasonic wave-assisted soaking for 3.5 hours, wherein the ultrasonic wave has a power of 90 W, washing with deionized water, and then roasting at 420° C. for 4 hours. After cooling to room temperature, soaking in hydrogen peroxide with a mass concentration of 10% for 3 hours, washing with deionized water until neutral, and drying. Then, adding a cetyltrimethylammonium bromide solution equivalent to 3% by weight of the medical stone and 3% polyethylene glycol, stirring at a speed of 3000 r / min for 15 minutes, filtering, and drying to obtain the modified medical stone.

[0062] The particle size of the Tribulus terrestris powder is 4 mm and the moisture content is 3%;

[0063] The particle size of the small bone powder is 3mm and the moisture content is 3%;

[0064] The composite microbial preparation consists of Chaetomium, Trichoderma and Cryptococcus in a mass ratio of 4:1:0.1.

[0065] The preparation method of the alkali salt precipitant comprises the following steps: uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, sclerotium sclerotium powder, barium sulfate and polyacrylamide in proportion, granulating, sieving, drying at 60° C. and cooling to room temperature.

[0066] Example 5

[0067] An alkali salt sedimentation agent is composed of the following raw materials in parts by weight: 24 parts of fulvic acid, 24 parts of modified medical stone, 22 parts of Tribulus terrestris powder, 9 parts of Ostreae chinensis powder, 7 parts of barium sulfate, 5 parts of anionic polyacrylamide, and 5 parts of a composite microbial preparation;

[0068] The modified medical stone is prepared by the following steps: crushing the medical stone to a particle size of 45 μm, placing the medical stone in hydrochloric acid and simultaneously applying ultrasonic wave-assisted soaking for 3.5 hours, wherein the ultrasonic wave has an ultrasonic power of 80 W, washing the medical stone with deionized water, and then roasting the medical stone at 420° C. for 5 hours. After cooling the medical stone to room temperature, soaking the medical stone in hydrogen peroxide with a mass concentration of 10% for 4 hours, washing the medical stone with deionized water until the stone is neutral, and drying the medical stone. Then, adding a cetyltrimethylammonium bromide solution with a mass concentration of 3% and polyethylene glycol with a mass concentration of 3% of the medical stone by weight and stirring the medical stone at a speed of 3000 r / min for 18 minutes, filtering the medical stone, and drying the medical stone to obtain the modified medical stone.

[0069] The particle size of the Tribulus terrestris powder is 5 mm and the moisture content is 5%;

[0070] The particle size of the small bone powder is 26mm and the moisture content is 4%;

[0071] The composite microbial preparation consists of Chaetomium, Trichoderma and Cryptococcus in a mass ratio of 2:3:0.5.

[0072] The preparation method of the alkali salt precipitant comprises the following steps: uniformly mixing the composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, sclerotium sclerotium powder, barium sulfate and polyacrylamide in proportion, granulating, sieving, drying at 60° C. and cooling to room temperature.

[0073] Comparative Example 1

[0074] The difference between this comparative example and Example 1 is that unmodified medical stone is added, and the other steps are consistent with Example 1.

[0075] Comparative Example 2

[0076] The difference between this comparative example and Example 1 is that the Tribulus terrestris powder is not added, and the other steps are consistent with Example 1.

[0077] Comparative Example 3

[0078] The difference between this comparative example and Example 1 is that the small bone powder is not added, and the other steps are consistent with Example 1.

[0079] Comparative Example 4

[0080] The difference between this comparative example and Example 1 is that the composite microbial preparation does not contain Chaetomium, and the other steps are consistent with Example 1.

[0081] Comparative Example 5

[0082] The difference between this comparative example and Example 1 is that the composite microbial preparation does not contain Trichoderma, and the other steps are consistent with Example 1.

[0083] Comparative Example 6

[0084] The difference between this comparative example and Example 1 is that the composite microbial preparation does not contain Cryptococcus, and the other steps are consistent with Example 1.

[0085] The alkali salt precipitants prepared in Examples 1-5 and Comparative Examples 1-6 were applied to a heavily saline-alkali area. The amounts of the alkali salt precipitants applied in the Examples and Comparative Examples were the same during the test. After 60 days, the ESP value and pH value of the soil were tested. The results are shown in Table 1.

[0086] Table 1 Test results of ESP value and pH value of soil after 60 days of alkali salt sedimentation agents prepared in Examples 1-5 and Comparative Examples 1-6

[0087] Group ESP value of soil (%) Soil pH Test soil 15.2 9.3 Example 1 5.1 7.1 Example 2 5.8 7.5 Example 3 5.9 7.2 Example 4 5.3 7.9 Example 5 5.1 7.8 Comparative Example 1 12.7 8.2 Comparative Example 2 11.5 8.0 Comparative Example 3 10.2 8.3 Comparative Example 4 12.5 8.9 Comparative Example 5 10.9 8.5 Comparative Example 6 10.1 8.6

[0088] From Table 1 and Figure 1 、 Figure 2 It can be seen that after the saline-alkali land was improved using the alkali-salt precipitant prepared in Examples 1-5, the salinity of the soil decreased significantly, the EPS value of the soil decreased from 15.2% to 5.1% at most, the pH value of the soil decreased from the original 9.3 to a normal level, and the saline-alkali soil was transformed from severe salinization to mild salinization. It can be seen that the alkali-salt precipitant provided by the present invention plays a very significant role in the improvement of saline-alkali soil.

[0089] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An alkali salt precipitant, characterized in that The invention comprises the following raw materials in parts by weight: 20-25 parts of humic acid, 20-25 parts of modified medical stone, 18-23 parts of tribulus terrestris powder, 7-10 parts of scutellaria baicalensis powder, 5-7 parts of barium sulfate, 3-5 parts of polyacrylamide, and 3-5 parts of a composite microbial preparation; The preparation method of the modified medical stone comprises: crushing the medical stone to a particle size of 20-50 μm, then placing the medical stone in hydrochloric acid and simultaneously applying ultrasonic wave-assisted soaking for 3-4 hours, wherein the ultrasonic wave has a power of 60-100 W, washing with deionized water, then roasting at 350-420° C. for 4-6 hours, cooling to room temperature, soaking in hydrogen peroxide with a mass concentration of 8-10% for 3-4 hours, then washing with deionized water until neutral, and then drying, then adding a cetyltrimethylammonium bromide solution equivalent to 3-5% by weight of the medical stone and 2-3% of polyethylene glycol, stirring at a speed of 2000-3000 r / min for 10-20 minutes, filtering, and drying to obtain the modified medical stone; The composite microbial preparation includes Chaetomium, Trichoderma and Cryptococcus; The mass ratio of Chaetomium, Trichoderma and Cryptococcus in the composite microbial preparation is 2-5:1-3:0.1-0.

5.

2. The alkali salt sedimentation agent according to claim 1, characterized in that The humic acid is selected from at least one of fulvic acid, humic acid and palmitic acid.

3. The alkali salt sedimentation agent according to claim 1, characterized in that The particle size of the Tribulus terrestris powder is 2-5 mm, and the moisture content is 2-5%.

4. The alkali salt sedimentation agent according to claim 1, characterized in that The particle size of the small bone powder is 2.5-6 mm, and the moisture content is 2-5%.

5. The alkali salt sedimentation agent according to claim 1, characterized in that The polyacrylamide is anionic polyacrylamide.

6. The method for preparing the alkali salt precipitant according to any one of claims 1 to 5, characterized in that: The composite microbial preparation, modified medical stone, humic acid, tribulus terrestris powder, osmanthus fragrans powder, barium sulfate and polyacrylamide are mixed evenly in proportion, granulated, sieved, dried and cooled.

7. Use of the alkali salt precipitator according to any one of claims 1 to 5 or the alkali salt precipitator prepared by the method according to claim 6 in improving saline-alkali land.

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