CN117204304A - Artificial soil with conjugated property and preparation method thereof - Google Patents
Artificial soil with conjugated property and preparation method thereof Download PDFInfo
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Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The application provides artificial soil with conjugate property and a preparation method thereof, which are applied to the technical field of artificial soil, wherein the preparation method comprises the following steps: crushing the waste inorganic soil to obtain artificial soil matrix fine materials; mixing the matrix fine materials, water and a soil conditioner to obtain a soil mixture; the soil conditioner comprises a bio-based polymer material with a surface modification function, an organic matter and a mineral material for increasing soil fertility, and the soil hydrophilicity/hydrophobicity, agglomeration/loosening, water permeability/fertilizer retention and other conjugated characteristics are regulated through modification; and (3) modifying and granulating the soil mixture in a roller to obtain the artificial soil with a stable aggregate structure. The granular structure artificial soil prepared by the method can be used for efficiently and quickly constructing a proper soil-water-gas-habitat according to different demand scenes, so that the problems of quick construction and fertility maintenance of the soil habitat are effectively solved, and the granular structure artificial soil has wide prospects in the fields of waste soil resource utilization, ecology, environment, agriculture and the like.
Description
Technical Field
The application relates to the technical field of artificial soil, in particular to artificial soil with conjugated properties and a preparation method thereof.
Background
At present, the unreasonable disposal of the spoil of mass production construction projects wastes a large amount of soil (stone) resources, and also encroaches on a large amount of land resources, thereby causing environmental pollution and even causing disasters such as landslide, debris flow, collapse and the like. Therefore, research on recycling of engineering spoil is necessary.
The existing related documents at home and abroad are subjected to statistical analysis, and the resource utilization of engineering spoil is mainly carried out in the following six aspects at present: firstly, screening and crushing the mixture to obtain aggregate; secondly, stone in the spoil is treated to be used as a novel wall material; thirdly, part of waste soil can be used for manufacturing hollow bricks; fourthly, directly backfilling the waste soil and waste slag in a pit or a mining subsidence area; fifthly, the construction method is used for landscape greening micro-terrain construction; sixthly, the waste soil is treated in a certain way and then is mixed with a soil conditioner and a growth medium to be used as 'foreign soil'. The soil improvement treatment mode can improve and protect soil environment, prevent pollution and maintain ecological balance, and improve the stability and persistence of an ecological system. However, it is difficult to achieve the contradictory unification of multiple pairs of different properties of soil, such as hydrophilicity and hydrophobicity, at the same time by the conventional soil improvement technology, which results in many failed engineering cases. Therefore, it is necessary to develop a new type of multi-media, multi-scale artificial soil having multiple pairs of opposing properties.
Disclosure of Invention
First, the technical problem to be solved
In view of the above, the present application provides an artificial soil having conjugate properties and a method for preparing the same, wherein discrete soil particles are agglomerated into a multi-medium, multi-scale soil aggregate structure having a plurality of pairs of opposite properties simultaneously by a soil conditioner and a roller granulation technique.
(II) technical scheme
The embodiment of the specification provides the following technical scheme:
the embodiment of the specification provides a preparation method of artificial soil with conjugate property, which comprises the following steps:
s01, crushing waste inorganic soil generated by engineering excavation to obtain artificial soil matrix fine materials;
s02, mixing the matrix fine materials obtained in the step S01 with water and a soil conditioner to obtain a soil mixture;
s03, modifying and granulating the soil mixture in the step S02 in a roller to obtain conjugated artificial soil with a stable aggregate structure;
wherein the soil conditioner comprises a bio-based polymer material with a surface modification function, an organic matter and a mineral material for increasing soil fertility; the soil conditioner can enable soil particles to be fully adhered to form a stable aggregate structure, and a rich pore structure among the aggregates is built; the adsorption effect of the soil conditioner on water can effectively lock capillary water in the aggregate, so that good hydrophilicity and water retention of soil are realized. Meanwhile, the bio-based polymer material can realize surface modification of soil aggregate and improve the hydrophobicity of soil; the porous structure of the organic matter can further improve the porosity in the aggregate, thereby realizing good water permeability and air permeability of soil; the addition of organic matters and mineral materials also provides nutrient substances for the growth and propagation of microorganisms in the soil, the process of decomposing the organic matters enables the temperature in the soil to be increased, and the generated fermentation liquor can coordinate the bacterial colony balance in the soil and maintain the temperature stable.
The addition amount of the soil conditioner is 0.01-0.08 per mill of the matrix fine materials.
In some embodiments, the mass ratio of the bio-based polymer material, the organic matter and the mineral material is 1-3: 4 to 7:0.5 to 1.5.
In some embodiments, the bio-based polymer material comprises starch ferment, polyacrylamide, peanut shell powder and wood chip charcoal, wherein the mass ratio of the starch ferment to the polyacrylamide to the peanut shell powder to the wood chip charcoal is 2-4: 0.5 to 1.5:13 to 18:1 to 3.
In some embodiments, the organic matter comprises chicken manure or sheep manure.
In some embodiments, the mineral material comprises potassium fulvate and lime in a mass ratio of 1: 4-1: 7.
in some embodiments, the mass ratio of the bio-based polymer material, the organic matter and the mineral material is specifically 2:5:1, a step of; the mass ratio of the starch ferment to the polyacrylamide to the peanut shell powder to the wood chip charcoal is specifically 3:1:15:2; the mass ratio of the potassium fulvate to the lime is specifically 1:5.
in some embodiments, the higher the concentration of the soil conditioner, the slower the soil moisture evaporation rate of the artificial soil.
In some embodiments, the surface solid-liquid contact angle and the drop profile height value of the drop formed after the artificial soil is contacted with water are respectively proportional to the addition amount of the soil conditioner.
In some embodiments, the particle diameter of the matrix fines is less than 0.2mm; the porosity of the artificial soil is 40% -60%.
The embodiment of the specification also provides artificial soil with conjugate property, which is prepared based on the preparation method of the artificial soil with conjugate property in any embodiment of the specification.
(III) beneficial effects
Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least:
1) The application can realize the fertility improvement of the barren soil structure, is beneficial to the improvement of the agricultural yield increase, ecological restoration and carbon sink capacity of the soil, and realizes the power-assisted double-carbon target.
2) The application can construct soil habitat different from the existing soil habitat in the nature, and optimally regulate succession and sustainable development of a natural ecological system through the functions of biological coupling, ecological conjugation, ground force lifting and the like.
3) The application can efficiently and quickly construct a proper soil-water-gas-habitat (habitat is ecological environment) aiming at different demand scenes, can effectively solve the difficult problems of quick construction and fertility maintenance of the soil habitat under complex soil-water-gas-habitat conditions, and has wide prospects in the fields of waste soil resource utilization, ecology, environment, agriculture and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a preparation flow in an embodiment of the present application;
FIG. 2 is a schematic view of the structure of soil agglomerates in the artificial soil of the present application;
FIG. 3 is a schematic structural view of the artificial soil of the present application;
FIG. 4 is a graph showing experimental results of stability test of a conjugate soil structure in the embodiment of the application;
FIG. 5 is a graph showing the results of experimental tests of the water retention of conjugate soil in the examples of the present application;
FIG. 6 is a graph showing the results of experimental test surface droplet morphology of conjugate soil hydrophobicity in an embodiment of the present application;
FIG. 7 is a graph showing the results of experimental tests of hydrophobicity of conjugate soil in the examples of the present application;
FIG. 8 is a flow chart of a method of preparation of the present application;
in the figure: 1-soil particles, 2-soil aggregates, 3-polyacrylamide, 4-wood dust carbon and 5-conjugate soil water-permeable and breathable structures.
Detailed Description
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatus may be implemented and/or methods practiced using any number and aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present application may be practiced without these specific details.
Referring to fig. 8, an embodiment of the present disclosure provides a method for preparing artificial soil having conjugated properties, including the steps of:
s01, crushing waste inorganic soil generated by engineering excavation to obtain artificial soil matrix fine materials;
s02, mixing the matrix fine materials obtained in the step S01 with water and a soil conditioner to obtain a soil mixture;
s03, modifying and granulating the soil mixture in the step S02 in a roller to obtain conjugated artificial soil with a stable aggregate structure;
the soil conditioner comprises a bio-based polymer material with a surface modification function, and organic matters and mineral materials for increasing soil fertility; the addition amount of the soil conditioner is 0.01 to 0.08 per mill of the matrix fine materials, preferably 0.01 to 0.03 per mill, 0.05 to 0.08 per mill.
It should be noted that: in the present application, the waste inorganic soil is engineering spoil, and the source of the engineering spoil is not particularly limited. The waste inorganic soil is preferably crushed and sieved and then mixed with the soil conditioner.
In some embodiments, the mass ratio of the bio-based polymeric material, the organic matter and the mineral material is 1-3: 4 to 7:0.5 to 1.5; the bio-based polymer material comprises 2 to 4 mass ratio of starch ferment, polyacrylamide, peanut shell powder and wood chip carbon: 0.5 to 1.5:13 to 18:1 to 3.
In some embodiments, the organic matter comprises chicken manure or sheep manure.
In some embodiments, the mineral material includes potassium fulvate and lime; the mass ratio of the potassium fulvate to the lime is 1: 4-1: 7.
in the application, the soil conditioner can fully bond soil particles to form a stable aggregate structure, and a rich pore structure among the aggregates is created; the adsorption effect of the soil conditioner on water can effectively lock capillary water in the aggregate, so that good hydrophilicity and water retention of soil are realized. Meanwhile, the bio-based polymer material can realize surface modification of soil aggregate and improve the hydrophobicity of soil; the porous structure of the organic matter can further improve the porosity in the aggregate, thereby realizing good water permeability and air permeability of soil; the addition of organic matters and mineral materials also provides nutrient substances for the growth and propagation of microorganisms in the soil, the process of decomposing the organic matters enables the temperature in the soil to be increased, and the generated fermentation liquor can coordinate the bacterial colony balance in the soil and maintain the temperature stable.
In some embodiments, the higher the concentration of soil conditioner, the slower the soil moisture evaporation rate of the artificial soil; the surface solid-liquid contact angle and the liquid drop profile height value of the liquid drop formed after the artificial soil is contacted with water are respectively in direct proportion to the addition amount of the soil conditioner, namely, the addition amount of the soil conditioner is more nearly 0.08 per mill, and the surface solid-liquid contact angle of the liquid drop formed after the artificial soil is contacted with water is more larger, and the liquid drop profile height is higher.
In some embodiments, the particle diameter of the matrix fines is less than 0.2mm; the porosity of the artificial soil is 40% -60%.
According to the application, soil particles are fully bonded through the bonding effect of polyacrylamide to form a stable aggregate structure, so that a rich pore structure among the aggregates is created; meanwhile, the porous structure of the wood chip carbon can further improve the porosity in the aggregate body, so that good hydrophobicity, water permeability and air permeability of soil are realized. In addition, the adsorption effect of polyacrylamide on water can effectively lock capillary water in the aggregate, so that good hydrophilicity and water-retaining property of soil are realized. The addition of the peanut shell powder, the amylase and the potassium fulvate provides nutrient substances for the growth and propagation of microorganisms in the soil, the temperature in the soil is increased in the process of decomposing organic matters, and the generated fermentation liquid can coordinate the bacterial colony balance in the soil and maintain the temperature stable. Lime has the functions of regulating the pH of soil and improving the acid-base buffering property of the soil. In the application, the soil aggregate structure has good water stability, force stability and multi-stage porosities, can promote the nutrient availability and acid-base buffering property, and simultaneously achieves the purpose of saving water and fertilizer.
In the present application, the artificial soil having the conjugated property is referred to as "conjugated soil", and the conjugated property means that the conjugated soil material can realize the opposites unification of a plurality of pairs of different properties, and has hydrophilicity and hydrophobicity, water permeability and water retention, air permeability and temperature retention, etc. simultaneously.
According to the application, the obtained soil mixture is subjected to modification and granulation in a roller to obtain the artificial soil with a stable aggregate structure, and the conjugation properties of soil, such as hydrophilicity/hydrophobicity, agglomeration/loosening, water permeability/fertilizer retention, and the like, are regulated through modification.
Example 1:
as shown in fig. 1, the preparation method of the novel artificial soil with conjugation property in this embodiment specifically includes the following steps:
firstly, crushing waste inorganic soil generated by engineering excavation to obtain artificial soil matrix fine materials; the method comprises the following steps: firstly, throwing waste inorganic soil into a raw soil bin by using a loader, and then conveying the waste inorganic soil to a crushing system by using a conveyor for crushing treatment and screening treatment; the diameter of the sieved matrix fine material particles is smaller than 0.2mm.
The second step, the matrix fine materials treated in the first step and the soil conditioner are premixed and mixed to obtain a soil mixture, specifically, the matrix fine materials and the soil conditioner are put into a roller through a conveyor to be fully mixed to obtain the soil mixture; wherein the total addition amount of the soil conditioner is 0.01 per mill of the weight of the matrix fine materials, the soil conditioner substances are bio-based high polymer materials, organic matters and mineral materials, and the mass ratio is 2:5:1, the bio-based polymer material is starch ferment, polyacrylamide, peanut shell powder and wood chip charcoal, and the mass ratio is 3:1:15:2; the organic matter is chicken manure or sheep manure; the mineral materials are potassium fulvate and lime, and the mass ratio is 1:5, a step of;
and thirdly, modifying and granulating the soil mixture obtained in the second step in a roller to obtain artificial soil with a stable aggregate structure, namely preparing the conjugate soil material with a good water-permeable and air-permeable structure.
As shown in fig. 2, the discrete soil particles 1 form soil agglomerates 2 through the bonding action of the polyacrylamide 3, the irregular embedding among the soil particles 1 provides a porous ventilation structure for the soil agglomerates 2, and the self-loose and porous structure of the wood dust carbon 4 further improves the internal porosity of the soil agglomerates 2; as shown in fig. 3, adjacent soil aggregates 2 form a conjugate soil water-permeable and air-permeable structure 5 (the conjugate soil water-permeable and air-permeable structure 5 is pores between the soil aggregates 2, which indicates that the soil aggregates are stacked to form a conjugate soil with a good structure).
Example 2:
the difference from example 1 is that: the total addition of the soil conditioner was 0.03% by weight of the engineering raw soil, and the rest was the same as in example 1.
Example 3:
the difference from example 1 is that: the total addition of the soil conditioner was 0.05% by weight of the engineering raw soil, and the rest was the same as in example 1.
Example 4:
the difference from example 1 is that: the total addition of the soil conditioner was 0.08% by weight of the engineering raw soil, and the rest was the same as in example 1.
Example 5:
experimental tests were performed on the properties of the conjugate earth materials prepared in examples 1 to 4, including structural stability and holding/hydrophobicity of the conjugate earth materials.
(1) Structural stability of the conjugate soil material
Soil structural stability can be categorized into mechanical stability, which is generally assessed by measuring the force stability of the agglomerates, and water stability, which can be assessed by measuring the water stable agglomerates. In this example, the force stability and water stability aggregate distribution characteristics of the conjugate soil material were determined using dry and wet screening methods.
In example 4, the particle size distribution characteristics of the conjugate soil agglomerates measured by the dry and wet screening methods are shown in FIG. 4. As can be seen from FIG. 4, the particle size distribution of the agglomerates obtained by the dry-wet screening method is respectively in a single-peak distribution and a double-peak distribution, but the particle size distribution of the agglomerates of the conjugate soil under the dry-wet screening treatment is obviously different. As can be seen from FIG. 4, in the particle size distribution of the air-dried agglomerate obtained by the dry sieving method, the agglomerate content with the particle size of 0.25-2 mm is the highest, and is more than half of the total agglomerates, and is far higher than other particle size grades, and the agglomerate content with the particle size of <0.054mm is the smallest, and is only 1.63%. The agglomerate content of 5-10 mm, 2-5 mm and 0.054-0.25 mm is 14.79%, 27.76% and 3.02% respectively. Agglomerates are divided into large agglomerates (> 0.25 mm) and micro-agglomerates (< 0.25 mm) by agglomerate particle size, 0.25 mm. According to the dry screening result, the content of the non-water stable large aggregate exceeds 90%.
As is clear from FIG. 4, in the particle size distribution measured by wet screening, the content of aggregates having a particle size of 0.053 to 0.25mm was the highest, 27.27%, and the proportion of aggregates having a particle size of >5mm of the conjugate soil particles was the lowest, 1.28%. The agglomerate content of 3-5 mm, 2-3 mm, 1-2 mm, 0.5-1 mm, 0.25-0.5 and <0.053mm is 4.49%, 3.95%, 11.84%, 16.50%, 19.46% and 15.21% respectively.
Soil agglomerates obtained by dry and wet screening methods are described for stability using the average weight diameter (MWD, mean weight diameter), geometric average diameter (GMD, geometric mean diameter), and structure failure rate (PAD, diameter), as shown in formulas 2.1-2.3. Soil agglomerates can be classified into large agglomerates and small agglomerates, where the diameter >0.25mm is known as large agglomerates. Large agglomerates can be classified into two types, water-stable and non-water-stable, depending on their resistance to water-dispersing action. The content of the water-stable large aggregate is an important index for evaluating the structural stability of soil, and has important significance. The calculation formulas of the large aggregate and the water stability large aggregate content are shown in the formulas 2.4-2.5.
Wherein: x is x i An average diameter (mm) of water-stable granules in any size fraction range; w (w) i To correspond to x i Is a percentage of agglomerates.
Wherein: p is the mass percent (%) of the air-dried aggregate with the thickness of more than 0.25 mm; q is the mass percent (%) of the water-stable agglomerate of more than 0.25 mm.
Wherein: r is R 0.25 Is the content of large agglomerates with the diameter of more than 0.25 mm; m is M T Is the total mass of the agglomerate.
Wherein: r is R 0.25wet Is the content (by weight) of water stable agglomerates with a diameter greater than 0.25 mm.
In this example, agglomerates of the conjugate soil were obtained by the dry/wet screening method, and MWD, GMD and R0.25 were selected as the agglomerate stability evaluation indexes, and the results are shown in table 1 below. The average MWD of the agglomerates was 2.68cm and the average GMD was 1.30cm in the dry screen treatment, while the average MWD of the agglomerates was 0.79cm and the average GMD was 0.62cm in the wet screen treatment. The larger the MWD and GMD indices, the more stable the agglomerates. It is known that the structural stability evaluation index of the conjugate soil shows that the force stability and the water stability of the aggregate are poor, but the force stability is relatively high, namely, the aggregation state can still be kept stable under the action of certain external force.
Meanwhile, as can be seen from Table 1, the wet screen showed a lower content of large agglomerates than the dry screen. Large agglomerates can be classified as water stable and non-water stable. The water-stable aggregate is not easy to disperse or disintegrate immediately after being soaked in water, and the original structural form and the binding capacity are maintained. The water-stable aggregate content is one of the important indexes for evaluating the structural stability of soil, and can be determined by a wet sieve test. The different proportions of aggregates with different particle sizes are one of the inherent causes of the soil fertility difference. For example, water stable aggregates with diameters between 0.25 and 0.5mm are relatively stable and contribute the most to the soil base nutrients. Therefore, soil aggregate is also an important marker for evaluating soil fertility level.
According to the results of Table 1, the results of the agglomerate stability evaluation of the conjugate soil showed that the average content of water-stable agglomerates of >0.25mm was 55.76% and the content of water-stable agglomerates of 0.25 to 0.5mm was 19.46% in the wet sieve treatment. The conjugated soil is proved to have poor resistance to water dispersion and low supply capacity of soil basic nutrients due to easy dispersion and easy breakage of the aggregate structure after being soaked in water.
TABLE 1 stability index of conjugate soil agglomerates under Dry and Wet Screen treatment
(2) Conjugate soil material holding/hydrophobicity
The water retention of soil means the ability of the soil to absorb and retain a certain amount of moisture, and it is important to improve the water retention of the soil for effective use of the moisture. The hydrophobicity of the soil can improve the physical structure to a certain extent, enhance the water stability, effectively conservation the water source and improve the soil pore environment.
In the embodiment, the conjugate soil material water retention research adopts a ring cutter weighing method to measure the maximum water retention of the soil capillary and the saturated water content of the soil. I.e. after the soil sample is hygroscopic, the soil sample is placed in the same temperature environment (60 ℃) for 24 hours, the soil is weighed every one hour, and the soil moisture evaporation rate is measured.
The test results are shown in FIG. 5, and it is clear from the graph that the moisture content is 36.93% when all capillary pores in the undisturbed soil are filled with water. After evaporation for 24 hours at a constant temperature of 60 ℃, the water content is reduced to 2.93%. The water content of the conjugate soil material is changed from 38.21% -39.92% to 4.60% -8.07%. According to the change curve of the water content of the soil, the water content curve is basically parallel to decrease at the beginning of evaporation, which indicates that the water loss rate of the soil is similar, and then the water content of the conjugate soil material is slower than that of the original soil along with time. As can be seen from the figure, the moisture loss rate in the soil during evaporation of undisturbed soil is very high. The conjugated soil material can slow down the evaporation rate of water, and the water content of soil in the evaporation process is always higher than that of undisturbed soil, but the change is not obvious in the initial stage of evaporation. After 7 hours of evaporation, according to the relationship between the moisture content of the soil and time, the moisture content of the undisturbed soil is 18.63%, the moisture content is close to the lower limit of available effective water of the soil, and at the moment, the plant cannot absorb moisture from the soil well, so that the plant growth is negatively influenced.
In contrast, the conjugate soil material can effectively inhibit the evaporation of soil moisture in the evaporation process, so that more moisture is maintained for a longer time, and the water retention capacity of the soil is improved. Different applied concentrations of soil conditioner have different effects on slowing the rate of moisture evaporation. Overall, the higher the soil conditioner concentration, the slower the evaporation rate of soil moisture. It can be seen that the soil conditioner has a certain effect in reducing ineffective water consumption, and is suitable for the soil in the water-deficient area to improve the water-retaining capacity of the soil.
In this example, in order to investigate the hydrophobicity of the conjugate soil material, the solid-liquid contact angle of the soil surface with water before and after the application of the additive was measured by a contact angle measuring instrument, and the morphology of the droplet on the soil surface was observed, as shown in fig. 6. As can be seen from fig. 6, the outline and morphology of the conjugate soil surface droplets are similar to those of undisturbed soil, but with a certain difference. The contact area of the liquid drops on the undisturbed soil surface is larger, and the contour height is lower. The outline height of the conjugate soil liquid drop is higher than that of undisturbed soil, and the surface contact area is smaller. The higher the concentration of soil conditioner, the more pronounced the drop profile change, with the profile height generally exhibiting an increasing trend with increasing additive concentration. At an additive concentration of 0.08%o, the drop profile height reached a maximum and was hemispherical. In addition, fig. 6 and 7 show the variation of the contact angle size with time, with a contact angle of 80.8 ° at an additive concentration of 0.08%.
As can be seen from fig. 7, the evaporation time of the droplet having a volume of 2 μm on the surface of the undisturbed soil takes about 15.5 seconds, and the evaporation time of the conjugate soil takes longer than that of the undisturbed soil to be complete. The evaporation time of the conjugate soil is 19.6-23.5 s, and the residence time of the liquid drops on the soil surface is increased by 26.45-54.61%.
In addition, based on the same inventive concept, the embodiment of the present disclosure also provides an artificial soil with conjugate properties, which is prepared and obtained based on the preparation method of the artificial soil with conjugate properties described in any one of the foregoing embodiments.
In this specification, identical and similar parts of the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the description is relatively simple for the embodiments described later, and reference is made to the description of the foregoing embodiments for relevant points.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. The preparation method of the artificial soil with the conjugate property is characterized by comprising the following steps of:
s01, crushing waste inorganic soil generated by engineering excavation to obtain artificial soil matrix fine materials;
s02, mixing the matrix fine materials obtained in the step S01 with water and a soil conditioner to obtain a soil mixture; wherein the soil conditioner comprises a bio-based polymer material with a surface modification function, an organic matter and a mineral material for increasing soil fertility; the addition amount of the soil conditioner is 0.01-0.08 per mill of the matrix fine materials;
and S03, modifying and granulating the soil mixture in the step S02 in a roller to obtain the conjugated artificial soil with a stable aggregate structure.
2. The method for preparing artificial soil with conjugated property according to claim 1, wherein the mass ratio of the bio-based polymer material to the organic matter to the mineral material is 1-3: 4 to 7:0.5 to 1.5.
3. The preparation method of the artificial soil with conjugated property according to claim 2, wherein the bio-based polymer material comprises starch ferment, polyacrylamide, peanut shell powder and wood chip carbon, and the mass ratio of the starch ferment to the polyacrylamide to the peanut shell powder to the wood chip carbon is 2-4: 0.5 to 1.5:13 to 18:1 to 3.
4. The method for preparing artificial soil having conjugated properties according to claim 1, wherein the organic matter comprises chicken manure or sheep manure.
5. A method for preparing artificial soil having conjugated properties according to claim 3, wherein the mineral material comprises potassium fulvate and lime in a mass ratio of 1: 4-1: 7.
6. the method for preparing artificial soil with conjugated properties according to claim 5, wherein the mass ratio of the bio-based polymer material to the organic matter to the mineral material is specifically 2:5:1, a step of; the mass ratio of the starch ferment to the polyacrylamide to the peanut shell powder to the wood chip charcoal is specifically 3:1:15:2; the mass ratio of the potassium fulvate to the lime is specifically 1:5.
7. a method for producing artificial soil having conjugate properties according to claim 3, wherein the higher the concentration of said soil conditioner is, the slower the soil moisture evaporation rate of said artificial soil is.
8. The method for preparing artificial soil having conjugated properties according to claim 3, wherein the surface solid-liquid contact angle and the drop profile height value of the drops formed after the artificial soil is contacted with water are respectively proportional to the addition amount of the soil conditioner.
9. The method for preparing artificial soil having conjugated properties according to claim 1, wherein the particle diameter of the matrix fine material is less than 0.2mm; the porosity of the artificial soil is 40% -60%.
10. An artificial soil having conjugate properties, prepared based on the method for preparing an artificial soil having conjugate properties according to any one of claims 1 to 9.
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