Method for preparing soil conditioner by using fly ash as raw material

Abstract

The invention discloses a method for preparing a soil conditioner by using fly ash as a raw material. The invention belongs to the technical field of soil improvement, the industrial waste fly ash of a power plant is fully utilized and converted into a soil conditioner with practical value, dependence on natural resources is reduced, the production cost is reduced, meanwhile, the problem of environmental pollution caused by fly ash is solved, and the method is suitable for large-scale popularization and application. The cyclic utilization of resources and the improvement of environmental benefits are realized; the fly ash subjected to magnetic reduction treatment can effectively improve the physical structure of soil, increase the porosity and air permeability of the soil, reduce the bulk density of the soil, improve the water retention and water permeability of the soil, and facilitate the growth and development of crops; activated iron elements and other beneficial elements in the fly ash can be slowly released and supplemented into soil, the photosynthesis, stress resistance and quality of crops are enhanced, the yield and quality of the crops are improved, meanwhile, the problems of soil nutrient imbalance and environmental pollution caused by excessive use of chemical fertilizers are reduced, and the soil quality is improved. The sustainable development of agriculture can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of soil improvement, and specifically refers to a method for preparing a soil improver by taking fly ash as a raw material. Background Art

[0002] In today's era of accelerated industrialization, the power industry, as an important support for economic development, continues to expand in scale. However, power plants generate a large amount of fly ash waste during the production process. According to statistics, the annual global fly ash emissions are as high as hundreds of millions of tons, and this number continues to rise with the growth of electricity demand. In my country, the annual production of fly ash is also considerable, and its accumulation occupies a large amount of precious land resources. Many regions are facing the problem of tight fly ash storage space.

[0003] The long-term storage of fly ash not only wastes land resources, but also causes a series of serious environmental problems. On the one hand, fly ash particles are fine and easily generate dust under the action of wind, causing air pollution, affecting the quality of life and health of surrounding residents. It will also have an adverse impact on atmospheric visibility and bring safety hazards to industries such as transportation. On the other hand, heavy metals (such as lead, mercury, cadmium, etc.) and soluble salt substances in fly ash may penetrate into the soil and water under the action of rainwater leaching, causing soil pollution and water pollution, thereby destroying the ecological balance and posing a potential threat to agricultural production and the ecological environment.

[0004] At present, although the technology for handling and utilizing fly ash has made some progress, there are still many limitations. In the traditional treatment method, most fly ash is simply landfilled or piled up, and its potential value is not fully tapped. Although some fly ash is used in the field of building materials, such as preparing cement and bricks, this can only consume a limited part of the fly ash, which is far from meeting the growing demand for fly ash disposal.

[0005] In the agricultural sector, the degradation of soil quality is becoming increasingly prominent, and soil compaction is common, which seriously affects the growth of crops and the sustainable development of agriculture. Soil compaction leads to poor soil aeration and water permeability, restricted root growth, and difficulty in nutrient absorption, which reduces crop yield and quality. Existing soil conditioner products and methods are either expensive and unsuitable for large-scale agricultural production; or the effects are not long-lasting and cannot fundamentally solve problems such as soil compaction and nutrient imbalance.

[0006] Therefore, it is of great practical significance and urgency to develop an efficient, environmentally friendly and economically feasible fly ash resource utilization technology to transform it into a soil conditioner that can effectively improve soil structure and supplement soil nutrients. This will not only help solve the environmental pollution problem caused by fly ash, but also provide a cheap and high-quality soil improvement resource for agricultural production, realize the organic combination of industrial waste and agricultural production needs, and promote the construction of a resource-saving and environmentally friendly society. Summary of the invention

[0007] The purpose of the present invention is to provide a method for preparing a soil conditioner using fly ash as a raw material. The present invention makes full use of fly ash from power plants as industrial waste to convert it into a soil conditioner with practical value, thereby reducing dependence on natural resources and production costs, while solving the environmental pollution problem of fly ash and realizing resource recycling and environmental benefit improvement. The fly ash treated by magnetic reduction can effectively improve the physical structure of the soil, increase the porosity and air permeability of the soil, reduce the soil bulk density, and improve the water retention and water permeability of the soil, thereby solving the problem of soil compaction, creating a good soil environment for the growth of crop roots, promoting the respiration and nutrient absorption of the root system, and being beneficial to the growth and development of crops. The activated iron element and other beneficial elements (such as silicon, calcium, magnesium, etc.) in the fly ash can be slowly released and supplemented into the soil to meet the needs of crop growth for these elements, enhance the photosynthesis, stress resistance and quality of crops, improve the yield and quality of crops, and simultaneously reduce the soil nutrient imbalance and environmental pollution problems caused by excessive use of chemical fertilizers, thereby helping to achieve sustainable agricultural development.

[0008] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a method for preparing a soil conditioner using fly ash as raw material, wherein the soil conditioner comprises the following components in parts by weight: 50-100 parts of reduced fly ash, 10-40 parts of a binder, 1-20 parts of a microbial agent, and 2-15 parts of humic acid.

[0009] Preferably, the soil conditioner comprises the following components in parts by weight: 60-80 parts of reduced fly ash, 15-20 parts of a binder, 2-10 parts of a microbial agent, and 3-7 parts of humic acid.

[0010] Preferably, the binder consists of starch and bentonite.

[0011] Preferably, the microbial agent consists of one or more of Bacillus subtilis, Pseudomonas fluorescens and arbuscular mycorrhizal fungi.

[0012] The present invention also provides a method for preparing a soil conditioner using fly ash as a raw material, the preparation method comprising the following steps:

[0013] (1) Raw material pretreatment: fly ash from a power plant is selected and screened through a vibrating screen to obtain fly ash particles with uniform particle size;

[0014] (2) Magnetic reduction treatment: fly ash particles are placed in a magnetic field, hydrogen is introduced at a flow rate of 10 L / min, and the reaction is carried out at a temperature of 600 °C for 2 hours;

[0015] (3) Post-processing and molding: The fly ash after the reaction is naturally cooled, and then crushed into a particle size of 0.05-0.2 mm using a ball mill. A binder and a microbial agent are added as auxiliary additives. After mixing evenly, a granulation process is used to make a granular soil conditioner, and the finished product is obtained after drying.

[0016] Preferably, the particle size of the fly ash particles in step (1) is 0.1-1 mm.

[0017] Preferably, the intensity of the magnetic field in step (2) is 0.5-2 Tesla.

[0018] Preferably, the granulation process in step (3) is a disc granulation process.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The present invention makes full use of fly ash from power plants, an industrial waste, and converts it into a soil conditioner with practical value, thereby reducing dependence on natural resources and reducing production costs. At the same time, it solves the environmental pollution problem of fly ash, realizes the recycling of resources and the improvement of environmental benefits; (2) The fly ash treated by magnetic reduction in the present invention can effectively improve the physical structure of the soil, increase the porosity and air permeability of the soil, reduce the soil bulk density, and improve the water retention and permeability of the soil, which is beneficial to the growth and development of crops; the activated iron and other beneficial elements in the fly ash of the present invention can be slowly released and supplemented into the soil, thereby enhancing the photosynthesis, stress resistance and quality of crops, improving the yield and quality of crops, and reducing the soil nutrient imbalance and environmental pollution caused by excessive use of chemical fertilizers, which is conducive to the realization of sustainable agricultural development. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Effect of a method for preparing soil conditioner using fly ash as raw material on wheat yield.

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0024] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials and test strains used in the following examples are purchased from commercial channels unless otherwise specified.

[0025] Example 1

[0026] A method for preparing soil conditioner using fly ash as raw material

[0027] The soil conditioner comprises the following components in parts by weight: 60 parts of fly ash treated with reduction, 20 parts of a binder, 2 parts of a microbial agent, and 7 parts of humic acid.

[0028] Wherein, the binder consists of starch and bentonite.

[0029] Wherein, the microbial agent consists of Bacillus subtilis.

[0030] The present invention also provides a method for preparing a soil conditioner using fly ash as a raw material, the preparation method comprising the following steps:

[0031] (1) Raw material pretreatment: fly ash from a power plant is selected and screened through a vibrating screen to obtain fly ash particles with uniform particle size;

[0032] (2) Magnetic reduction treatment: fly ash particles are placed in a magnetic field, hydrogen is introduced at a flow rate of 10 L / min, and the reaction is carried out at a temperature of 600 °C for 2 hours;

[0033] (3) Post-processing and molding: The fly ash after the reaction is naturally cooled, and then crushed into a particle size of 0.05-0.2 mm using a ball mill. A binder and a microbial agent are added as auxiliary additives. After mixing evenly, a granulation process is used to make a granular soil conditioner, and the finished product is obtained after drying.

[0034] Wherein, the particle size of the fly ash particles in step (1) is 0.1-1 mm.

[0035] Wherein, the intensity of the magnetic field in step (2) is 0.5-2 Tesla.

[0036] Wherein, the granulation process in step (3) is a disc granulation process.

[0037] Example 2

[0038] A method for preparing soil conditioner using fly ash as raw material

[0039] The soil conditioner comprises the following components in parts by weight: 80 parts of fly ash treated by reduction, 15 parts of a binder, 10 parts of a microbial agent, and 3 parts of humic acid.

[0040] Wherein, the binder consists of starch and bentonite.

[0041] Wherein, the microbial agent consists of Bacillus subtilis.

[0042] The present invention also provides a method for preparing a soil conditioner using fly ash as a raw material, and the preparation method is implemented with reference to Example 1.

[0043] Example 3

[0044] A method for preparing soil conditioner using fly ash as raw material

[0045] The soil conditioner comprises the following components in parts by weight: 70 parts of fly ash treated with reduction, 18 parts of a binder, 6 parts of a microbial agent, and 5 parts of humic acid.

[0046] Wherein, the binder consists of starch and bentonite.

[0047] Wherein, the microbial agent consists of Bacillus subtilis.

[0048] The present invention also provides a method for preparing a soil conditioner using fly ash as a raw material, and the preparation method is implemented with reference to Example 1.

[0049] Experimental Example 1

[0050] Effect of a method for preparing soil conditioner using fly ash as raw material on wheat yield

[0051] The experimental field was divided into 9 plots and randomly divided into three groups, each with an area of ​​30m 2, the soil conditioner prepared in Example 1-3 was used as a test product, and isolation belts were set between the plots to prevent the soil conditioner and water from penetrating each other; according to the experimental design, the corresponding soil conditioner was evenly applied to each plot before sowing each year, and then ploughing, land preparation, ridge formation and other operations were carried out, wheat seedlings were planted, the plant spacing and row spacing were kept consistent, and conventional field management was carried out, including irrigation, pruning, disease and pest control, etc.; the wheat yield was recorded when it was mature.

[0052] Result analysis: The wheat yields of Example 1-3 groups were all at a high level, among which Example 2 group had the highest yield, followed by Example 1 group and Example 3 group.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0054] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for preparing a soil conditioner using fly ash as raw material, characterized in that: The soil conditioner comprises the following components in parts by weight: 50-100 parts of fly ash treated by reduction, 10-40 parts of a binder, 1-20 parts of a microbial agent, and 2-15 parts of humic acid.

2. The method for preparing a soil conditioner using fly ash as raw material according to claim 1, characterized in that: The soil conditioner comprises the following components in parts by weight: 60-80 parts of fly ash treated by reduction, 15-20 parts of a binder, 2-10 parts of a microbial agent, and 3-7 parts of humic acid.

3. The method for preparing a soil conditioner using fly ash as raw material according to claim 2, characterized in that: The binder consists of starch and bentonite.

4. The method for preparing a soil conditioner using fly ash as raw material according to claim 3, characterized in that: The microbial agent is composed of one or more of Bacillus subtilis, Pseudomonas fluorescens and arbuscular mycorrhizal fungi.

5. The method for preparing a soil conditioner using fly ash as raw material according to claim 4, characterized in that: The preparation method comprises the following steps: (1) Raw material pretreatment: fly ash from a power plant is selected and screened through a vibrating screen to obtain fly ash particles with uniform particle size; (2) Magnetic reduction treatment: fly ash particles are placed in a magnetic field, hydrogen is introduced at a flow rate of 10 L / min, and the reaction is carried out at a temperature of 600 °C for 2 hours; (3) Post-processing and molding: The fly ash after the reaction is naturally cooled, and then crushed into a particle size of 0.05-0.2 mm using a ball mill. A binder and a microbial agent are added as auxiliary additives. After mixing evenly, a granulation process is used to make a granular soil conditioner, and the finished product is obtained after drying.

6. The method for preparing a soil conditioner using fly ash as raw material according to claim 5, characterized in that: The particle size of the fly ash particles in step (1) is 0.1-1 mm.

7. The method for preparing a soil conditioner using fly ash as raw material according to claim 6, characterized in that: The intensity of the magnetic field in step (2) is 0.5-2 Tesla.

8. The method for preparing a soil conditioner using fly ash as raw material according to claim 7, characterized in that: The granulation process in step (3) is a disc granulation process.

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