Method for processing vegetation compressed nutrient soil from serpentine

Abstract

The invention discloses a method for processing vegetation compressed nutrient soil from serpentine, which comprises the following specific manufacturing steps: step S1, modifying serpentine, and activating magnesium and silicon mineral elements; s2, preparing a nutrient soil matrix; s3, mixing and processing the modified serpentine and an organic matrix according to a proportion of 30-60%; and step S4, carrying out compression treatment on the plant-growing nutrient soil. By adopting the steps of mechanical crushing, weak acid complexing, high-temperature roasting, hydrothermal synthesis and the like, mineral elements such as magnesium and silicon in serpentine are fully released, the absorbability of plants is improved, the serpentine subjected to coating treatment by adopting a biomimetic mineral slow-release film, chitosan, humic acid, algal polysaccharides and the like can prolong the release period of magnesium and silicon ions, and the biomimetic mineral slow-release film, the chitosan, the humic acid, the algal polysaccharides and the like are used for improving the biomimetic mineral slow-release film and the biomimetic mineral slow-release film and the biomimetic mineral slow-release film. The organic fertilizer has the advantages of improving the nutrient utilization efficiency, reducing the loss, optimizing the organic matrix and improving the soil fertility, and provides a good physical and chemical structure by scientifically proportioning the coco coir, the humus soil, the biochar, the expanded vermiculite and the trace elements.

Description

Technical Field

[0001] The present invention relates to the technical field of soil improvement, and in particular to a method for processing serpentine into vegetative compressed nutrient soil. Background Art

[0002] Serpentine is a magnesium-containing silicate mineral widely distributed in the earth's crust, with a relatively high magnesium content and certain mineral nutrients. However, due to its dense structure, slow weathering, and limited release of magnesium ions, when directly used in plant growth soil, it is difficult to meet the nutrient requirements of crops or greening plants. Existing soil improvement methods mostly use chemical additives or mechanical crushing to improve the availability of serpentine, but there are still problems such as uneven nutrient release, poor water holding capacity, and unstable soil structure. Therefore, here we propose a method for processing serpentine into vegetative compressed nutrient soil. Summary of the Invention

[0003] In order to solve the above technical deficiencies, the present invention adopts a modified technical solution, a method for processing serpentine into vegetative compressed nutrient soil, and the specific production steps are as follows.

[0004] Step S1, perform a modification treatment on serpentine to activate magnesium and silicon mineral elements.

[0005] Step S2, prepare a nutrient soil matrix.

[0006] Step S3, mix and process the modified serpentine and the organic matrix in a ratio of 30-60%.

[0007] Step S4, perform a compression treatment on the vegetative nutrient soil.

[0008] As a further preferred embodiment of the present invention, in step S1, first perform mechanical ultrafine pulverization, using air flow pulverization or ball milling technology to pulverize serpentine to 100-500 nanometers, improve mineral activity and increase specific surface area, break the mineral lattice through shear force, release potential magnesium and silicon nutrients, weak acid complexation activation: soak serpentine with dilute organic acids such as citric acid, oxalic acid or microbial fermentation broth to dissolve part of the magnesium ions, control the pH value at 6.5-7.5 to ensure stable release of mineral nutrients, then perform high-temperature hydrothermal modification, calcine at 600-800 °C to cause partial disintegration of the serpentine structure, and then perform hydrothermal synthesis, steam treatment at 150-200 °C to promote interlayer hydration of the mineral, and finally perform mineral functionalization coating, load chitosan, humic acid or algal polysaccharides on the surface of the treated serpentine particles to form a biomimetic mineral slow-release film to extend the release period of magnesium and silicon ions.

[0009] As a further preferred embodiment of the present invention, in step S2, the formulation of the organic matrix combination includes: 30-40% coconut coir, 20-30% humus soil, 10-15% straw biochar, 5-10% expanded vermiculite, 5-10% trace elements, and 5-10% bioactivator. The bioactivator includes phosphate-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-solubilizing bacteria, and the trace elements include boron, zinc, and calcium.

[0010] As a further preferred embodiment of the present invention, in step S2, the method for preparing the organic matrix combination includes the following steps: first, crushing and screening: crushing the coconut coir into particles with a size of 0.5-2 mm, removing large impurities to improve the mixing uniformity, salt removal, soaking in 1-2% dilute acetic acid or water for 12-24 hours to remove excess salt, drying and adjusting: air-drying at a low temperature to a moisture content of 8-12%, sieving the humus soil through a sieve with a pore size of 2-5 mm to remove unrotted impurities, microbial fermentation: standing for 7-14 days at 30-40 °C to promote the decomposition of organic matter, straw biochar, high-temperature carbonization, controlling the temperature at 300-500 °C, alkaline adjustment: adjusting the pH value with a buffer solution of pH 5.5-6.5, expanded vermiculite, heat treatment, 850-1000 °C, to expand it to 8-12 times, and passing through electrostatic screening with a particle size of 0.5-2 mm, biochar loaded with minerals, loading montmorillonite and zeolite clay minerals on the surface of the biochar to enhance the slow-release ability, and then performing a mixing process.

[0011] As a further preferred embodiment of the present invention, in step S2, there is also a microbial culture process. Preparation of microbial fermentation broth: Culturing for 24-48 hours at 28-32 °C and pH 6.8-7.2 to obtain a high-activity bacterial liquid concentration of 10 7 -10 9 CFU / mL, using bentonite or humic acid as a carrier to enable microbial colonization and improve the survival rate. Spraying and mixing: Uniformly spraying the cultured microbial solution on the mineral materials and the organic matrix, and standing for 12-24 hours to ensure successful microbial colonization;

[0012] As a further preferred embodiment of the present invention, in step S3, for the mixing and processing, first add the mineral materials, ensure the gradual addition of the organic matrix, maintain a humidity of 40-50%, add the microbial inoculant, and stir for 10-15 minutes. Adjust the moisture content by spray humidification to adjust the moisture content of the mixture to 40-50%, and then perform compression molding.

[0013] As a further preferred embodiment of the present invention, in step S4, during the compression process, high-pressure compression is carried out at 5-15 MPa to form a compressed nutrient soil block with a pore structure, and then drying treatment is carried out, with the temperature controlled between 50-80 °C, and it is wrapped with a degradable biofilm to form a water control layer, and the degradable biofilm is one of a chitosan-sodium alginate composite film or a cellulose-protein film.

[0014] Beneficial effects

[0015] The present invention provides a method for processing serpentine into phytogenic compressed nutrient soil. It has the following beneficial effects:

[0016] By adopting steps such as mechanical crushing, weak acid complexation, high-temperature roasting, and hydrothermal synthesis, the present invention fully releases mineral elements such as magnesium and silicon in serpentine, improves plant absorbability. By using a bionic mineral slow-release film and coating serpentine with chitosan, humic acid, algal polysaccharides, etc., it can extend the release period of magnesium and silicon ions, improve nutrient utilization efficiency, reduce loss, optimize the organic matrix, and improve soil fertility. By scientifically proportioning coconut coir, humus soil, biochar, expanded vermiculite, and trace elements, it provides a good physical and chemical structure, enhances soil water retention, fertilizer retention, and air permeability, and promotes plant growth. By introducing microorganisms such as phosphate-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria, and using bentonite or humic acid as a carrier, it improves the survival rate of microorganisms, improves the soil ecological environment, and promotes plant nutrient absorption. By using straw biochar and buffer solution to adjust the pH value, the soil pH is maintained within an appropriate range, reducing acidification and salinization problems, improving soil stability. By using a chitosan-sodium alginate or cellulose-protein film to wrap the compressed nutrient soil block, a degradable water control layer is formed, reducing chemical pollution and improving ecological friendliness. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] The present invention provides a technical solution: a method for processing serpentine into phytogenic compressed nutrient soil, and the specific production steps include the following.

[0019] Step S1, modify the serpentine to activate magnesium and silicon mineral elements;

[0020] Step S2, prepare the nutrient soil matrix;

[0021] Step S3, mix and process the modified serpentine and the organic matrix in a ratio of 30-60%;

[0022] Step S4, compress the vegetation nutrient soil.

[0023] In step S1, first perform mechanical ultrafine grinding. Using air jet milling or ball milling technology, grind the serpentine to the 100 - 500 nanometer level, improve the mineral activity and increase the specific surface area. Break the mineral lattice through shear force to release potential magnesium and silicon nutrients. Weak acid complexation activation: Soak the serpentine with dilute organic acids such as citric acid, oxalic acid or microbial fermentation broth to dissolve part of the magnesium ions, control the pH value at 6.5 - 7.5 to ensure stable release of mineral nutrients. Then perform high-temperature hydrothermal modification. Roast at a high temperature of 600 - 800 °C to cause partial disintegration of the serpentine structure. Subsequently, perform hydrothermal synthesis, steam treatment at 150 - 200 °C to promote interlayer hydration of the mineral. Finally, perform mineral functional coating, load chitosan, humic acid or seaweed polysaccharide on the surface of the treated serpentine particles to form a biomimetic mineral slow-release membrane and extend the release period of magnesium and silicon ions.

[0024] In step S2, the formula of the organic matrix combination includes: 30 - 40% coconut coir, 20 - 30% humus soil, 10 - 15% straw biochar, 5 - 10% expanded vermiculite, 5 - 10% trace elements, 5 - 10% bioactive agents. The bioactive agents include phosphate-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria. The trace elements include boron, zinc, and calcium.

[0025] In step S2, the production method of the organic matrix combination includes the following steps. First, crushing and screening: Crush the coconut coir into 0.5 - 2 mm particles, remove large impurities to improve mixing uniformity. Salt removal, soak with 1 - 2% dilute acetic acid or clear water for 12 - 24 hours to remove excess salt. Drying and adjustment: Air-dry at low temperature to a moisture content of 8 - 12%. Sieve the humus soil through a 2 - 5 mm sieve pore to remove unrotted impurities. Microbial fermentation: Let it stand for 7 - 14 days at 30 - 40 °C to promote decomposition of organic matter. Straw biochar, high-temperature carbonization, control the temperature at 300 - 500 °C. Alkaline adjustment: Adjust the pH value with a buffer solution of pH 5.5 - 6.5. Expanded vermiculite, heat treatment at 850 - 1000 °C to expand it to 8 - 12 times, and then screen the particle size of 0.5 - 2 mm through electrostatic screening. Biochar loaded with minerals, load montmorillonite and zeolite clay minerals on the surface of the biochar to enhance the slow-release ability, and then perform mixing treatment.

[0026] In step S2, it also includes a microbial culture process. Preparation of microbial fermentation broth: Culture at 28 - 32 °C and pH 6.8 - 7.2 for 24 - 48 hours to obtain a high-activity bacterial liquid concentration of 10 7 -10 9CFU / mL, using bentonite or humic acid as a carrier to enable the colonization of microorganisms and improve the survival rate. Spraying and mixing: evenly spray the cultured microbial solution on the mineral materials and organic matrix, and let it stand for 12 - 24 hours to ensure the successful colonization of microorganisms;

[0027] In step S3, for the mixing and processing, first add the mineral materials, ensure the gradual addition of the organic matrix, maintain the humidity at 40 - 50%, add the microbial inoculant, and stir for 10 - 15 minutes. For moisture adjustment, use the spray humidification method to adjust the moisture content of the mixture to 40 - 50%, and then carry out compression molding.

[0028] In step S4, during the compression process, use a high pressure of 5 - 15 MPa for compression to form a compressed nutrient soil block with a pore structure, and then carry out drying treatment with the temperature controlled between 50 - 80 °C. Wrap it with a biodegradable biofilm to form a water control layer, and the biodegradable biofilm is one of chitosan - sodium alginate composite film or cellulose - protein film.

[0029] Example 1

[0030] A method for processing and vegetating compressed nutrient soil from serpentine

[0031] Preparation of modified serpentine

[0032] Use the air flow crushing technology to crush serpentine to 200 nanometers to improve the mineral activity and specific surface area; soak serpentine in 0.5% citric acid solution for 12 hours and adjust the pH to 7.0 to promote the partial dissolution of magnesium ions; carry out high - temperature roasting treatment with the temperature set at 700 °C to partially destroy the mineral lattice; treat it under hydrothermal synthesis conditions at 180 °C for 6 hours to enhance the mineral hydration performance; surface - load 0.5% chitosan solution to form a bionic mineral slow - release film and adjust the nutrient release period.

[0033] Preparation of nutrient soil matrix

[0034] Formulation: coconut coir 35%, humus soil 25%, straw biochar 12%, expanded vermiculite 8%, trace elements 7%, bio - activator 7%;

[0035] Treatment: crush coconut coir into 1 - mm particles, soak it in dilute acetic acid for 12 hours for desalination, and air - dry it at low temperature to a moisture content of 10%; screen humus soil to less than 2 mm and let it stand for fermentation for 10 days; carbonize straw at 450 °C and adjust the pH to 6.0; heat - treat expanded vermiculite at 900 °C to expand it 10 times and screen it to 1 mm; Microbial activation: phosphate - solubilizing bacteria, nitrogen - fixing bacteria, and potassium - releasing bacteria are cultured for 48 hours, with a concentration of 10 8 CFU / mL, the spraying carrier is humic acid, and let it stand for 18 hours to ensure the colonization of microorganisms.

[0036] Mixing and compression

[0037] Use 40% of modified serpentine, evenly mix with the nutrient soil matrix, and control the humidity at 45%; mechanically stir for 15 minutes, and gradually add microbial inoculants; compress and form at a pressure of 10 MPa to form a pore structure; dry at a low temperature of 60 °C for 8 hours, and wrap the surface with a chitosan-sodium alginate composite film to form a water control layer.

[0038] Example 2

[0039] A method for processing and vegetating compressed nutrient soil from serpentine

[0040] Preparation of modified serpentine

[0041] Use ball milling technology to crush serpentine to 300 nanometers to increase the specific surface area; soak in 0.8% oxalic acid solution for 24 hours, control the pH at 6.8 to promote the slow release of magnesium ions; roast at 800 °C to disintegrate part of the mineral structure; perform hydrothermal synthesis treatment at 150 °C for 4 hours to enhance the mineral activity; load 0.3% humic acid on the surface to form a mineral slow-release film and improve the stability of magnesium and silicon nutrient release.

[0042] Preparation of nutrient soil matrix

[0043] Formula: 40% coconut coir, 20% humus soil, 15% straw biochar, 5% expanded vermiculite, 10% trace elements, 10% bioactivator;

[0044] Treatment: Crush coconut coir to 2 mm, soak in clear water for 24 hours to desalt, and air dry to a moisture content of 8%; screen humus soil to less than 5 mm and ferment for 14 days; carbonize straw at 500 °C and adjust the pH to 6.2; treat expanded vermiculite at 850 °C and screen to 2 mm; Microbial activation: Cultivate phosphate-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria for 48 hours, with a concentration of 10 9 CFU / mL, with bentonite as the carrier, and let it stand for 24 hours before spraying and mixing.

[0045] Mixing and compression

[0046] Use 50% of modified serpentine, evenly mix with the nutrient soil matrix, and control the humidity at 50%; mechanically stir for 10 minutes, and gradually add microbial inoculants; compress and form at a pressure of 12 MPa to form a porous structure; dry at a low temperature of 70 °C for 6 hours, and wrap the surface with a cellulose-protein film to form a degradable water control layer.

[0047] Example 3

[0048] Preparation of modified serpentine

[0049] The serpentine is pulverized to 150 nm using airflow pulverization technology to improve the mineral activity. It is soaked in 0.6% microbial fermentation broth for 18 hours, and the pH is controlled to 7.2 to promote the release of magnesium and silicon ions. It is calcined at 750 °C for 3.5 hours to disintegrate part of the mineral structure and improve the nutrient release rate. It is hydrothermally synthesized at 200 °C for 5 hours to enhance the interlayer hydration ability of the mineral. 0.4% seaweed polysaccharide is loaded on the surface to form a slow-release film and improve the persistence of mineral nutrients.

[0050] Preparation of nutrient soil substrate

[0051] Formulation: 32% coconut coir, 28% humus soil, 12% straw biochar, 6% expanded vermiculite, 10% trace elements, 12% bioactivator. Treatment: The coconut coir is pulverized to 1.5 mm, soaked in dilute acetic acid for 18 hours for desalination, and air-dried to a moisture content of 9%. The humus soil is screened to 3 mm and fermented for 7 days to improve the activity of organic matter. The straw is carbonized at 400 °C and the pH is adjusted to 6.4 to improve the slow-release ability. The expanded vermiculite is treated at 880 °C and screened to 1.5 mm. Microbial activation: Phosphorus-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria are cultured for 36 hours at a concentration of 10 7 CFU / mL. Humic acid is used as a carrier, and after standing for 16 hours, it is sprayed and mixed to improve the survival rate of microorganisms.

[0052] Mixing and compression

[0053] 45% of the modified serpentine is used and evenly mixed with the nutrient soil substrate, and the humidity is controlled at 47%. Mechanically stirred for 12 minutes, and the microbial inoculant is gradually added. Compressed and formed under a pressure of 8 MPa to form a uniform porous structure. Low-temperature dried at 65 °C for 7 hours, and the surface is wrapped with a chitosan-sodium alginate composite film to form a degradable water control layer.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0055] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for processing serpentine into vegetative compressed nutrient soil, characterized in that: The specific manufacturing steps are as follows: Step S1: Modify serpentine to activate magnesium and silicon mineral elements. Step S2: Prepare the nutrient soil matrix. Step S3: Mix and process the modified serpentine and the organic matrix in a ratio of 30 - 60%. Step S4: Compress the vegetative nutrient soil.

2. The method for processing serpentine into vegetative compressed nutrient soil according to claim 1, characterized in that, In step S1, first conduct mechanical ultrafine pulverization. Using air jet pulverization or ball milling technology, pulverize the serpentine to 100 - 500 nanometers to improve mineral activity and increase the specific surface area. Break the mineral lattice through shear force to release potential magnesium and silicon nutrients. Weak acid complexation activation: Soak the serpentine with dilute organic acids such as citric acid, oxalic acid, or microbial fermentation broth to dissolve part of the magnesium ions, control the pH value at 6.5 - 7.5 to ensure stable release of mineral nutrients. Then conduct high-temperature hydrothermal modification. Roast at a high temperature of 600 - 800 °C to cause partial disintegration of the serpentine structure. Subsequently, conduct hydrothermal synthesis and steam treatment at 150 - 200 °C to promote interlayer hydration of the mineral. Finally, conduct mineral functional coating, load chitosan, humic acid, or seaweed polysaccharide on the surface of the treated serpentine particles to form a biomimetic mineral slow-release membrane and extend the release period of magnesium and silicon ions.

3. The method for processing serpentine into vegetative compressed nutrient soil according to claim 2, characterized in that, In step S2, the formula of the organic matrix combination includes: 30 - 40% coconut coir, 20 - 30% humus soil, 10 - 15% straw biochar, 5 - 10% expanded vermiculite, 5 - 10% trace elements, and 5 - 10% biological activators. The biological activators include phosphorus-solubilizing bacteria, nitrogen-fixing bacteria, and potassium-dissolving bacteria. The trace elements include boron, zinc, and calcium.

4. A method for processing serpentine into vegetative compressed nutrient soil according to claim 3, characterized in that, In step S2, the manufacturing method of the organic matrix combination includes the following steps. First, pulverize and screen: Pulverize the coconut coir into particles of 0.5 - 2 mm, remove large impurities to improve mixing uniformity. Salt removal: Soak with 1 - 2% dilute acetic acid or clean water for 12 - 24 hours to remove excess salt. Drying adjustment: Air-dry at a low temperature to a moisture content of 8 - 12%. Sieve the humus soil through a sieve with a pore size of 2 - 5 mm to remove unrotted impurities. Microbial fermentation: Let it stand for 7 - 14 days at 30 - 40 °C to promote decomposition of organic matter. Straw biochar, high-temperature carbonization, control the temperature at 300 - 500 °C. Alkalinity adjustment: Adjust the pH value with a buffer solution of pH 5.5 - 6.

5. Expanded vermiculite, heat treatment, 850 - 1000 °C, to expand it to 8 - 12 times, and then screen the particle size of 0.5 - 2 mm through electrostatic screening. Load minerals on the biochar, load montmorillonite and zeolite clay minerals on the surface of the biochar to enhance the slow-release ability, and then conduct mixing treatment.

5. A method for processing serpentine into vegetative compressed nutrient soil according to claim 4, characterized in that, In step S2, a microbial culture process is also included for the preparation of microbial fermentation broth: Cultivate for 24 - 48 hours under the conditions of 28 - 32 °C and pH 6.8 - 7.2 to obtain a high - activity bacterial liquid concentration of 10 7 -10 9 CFU / mL. Use bentonite or humic acid as a carrier to enable the colonization of microorganisms and improve the survival rate. Spray mixing: Uniformly spray the cultured microbial solution on the mineral materials and organic matrix, and let it stand for 12 - 24 hours to ensure the successful colonization of microorganisms.

6. A method for processing serpentine into vegetative compressed nutrient soil according to claim 1, characterized in that, In step S3, for the mixing and processing, first add the mineral materials, ensure the gradual addition of the organic matrix, maintain the humidity at 40 - 50%, add the microbial inoculant, and stir for 10 - 15 minutes. Adjust the moisture content, adopt the spray humidification method to adjust the moisture content of the mixture to 40 - 50%, and then conduct compression molding.

7. A method for processing serpentine into vegetative compressed nutrient soil according to claim 1, characterized in that, In step S4, during the compression process, high-pressure compression is carried out at 5 - 15 MPa to form a compressed nutrient soil block with a pore structure, and then drying treatment is carried out with the temperature controlled between 50 - 80 °C. It is wrapped with a degradable biofilm to form a water control layer, and the degradable biofilm is one of a chitosan-sodium alginate composite film or a cellulose-protein film.