Method for preparing soil conditioner through resource utilization of coal-based solid waste

Abstract

The invention belongs to the field of environmental protection and agriculture, and particularly relates to a method for preparing a soil conditioner by using coal-based solid waste, which comprises the following steps: pretreating the coal-based solid waste, adding a mixing agent, adjusting the pH value, fermenting, drying and crushing. According to the method, the coal-based solid waste is converted into the soil conditioner, so that resource utilization of industrial waste is realized. According to the method, pollution of coal-based solid waste to the environment is reduced, land resources are saved, and environmental risks caused by solid waste landfill or stacking are avoided. Meanwhile, through resource utilization, exploitation of natural resources is reduced, and the concept of sustainable development is met.

Description

[0001] Methodology Area

[0002] The invention belongs to the fields of environmental protection and agriculture, and in particular relates to a method for preparing a soil conditioner by utilizing coal-based solid waste.

[0003] Background Methods

[0004] With the continuous development of the coal industry, the amount of coal-based solid waste has increased year by year. If these solid wastes are not treated, they will cause serious pollution to the environment. Coal-based solid wastes include coal gangue, fly ash, and gasification ash produced during coal gasification. If these solid wastes are not handled properly, they will not only occupy a large amount of land resources, but may also cause pollution through water, air and soil. At present, the development of circular economy faces problems such as insufficient utilization of bulk solid wastes and low added value of comprehensive utilization products, which puts forward higher requirements for the treatment of coal-based solid wastes. Gradually transform from reduced treatment to resource utilization, high value and large-scale utilization, so that it can produce greater social and economic benefits. At the same time, the problem of soil degradation is becoming more and more serious, and effective soil conditioners are needed to improve soil structure and increase soil fertility. Soil conditioners can improve the physical, chemical and biological properties of soil, making it more suitable for plant growth. By using soil conditioners, we can effectively improve soil moisture, increase the temperature of the cultivated layer, improve soil structure, coordinate the relationship between soil water, fertilizer, air, heat and organisms, prevent soil erosion, enhance the anti-seepage capacity of channels, inhibit secondary salinization of soil, and improve the development and utilization of sandy wasteland.

[0005] Therefore, developing a method for preparing soil conditioners by resource utilization of coal-based solid waste can not only effectively solve the environmental problems of coal-based solid waste, but also provide solutions for soil degradation, thus achieving the dual goals of environmental protection and sustainable agricultural development. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing a soil conditioner by resource utilization of coal-based solid waste, which can effectively utilize coal-based solid waste, reduce environmental pollution, and prepare a soil conditioner with good improvement effect. In order to solve the above method problems, the method scheme provided by the present invention is as follows:

[0007] A method for preparing a soil conditioner by resource utilization of coal-based solid waste, the method comprising the following steps:

[0008] S1. Collect coal-based solid waste;

[0009] S2. Pre-processing of coal-based solid waste, including crushing, drying and screening;

[0010] S3. mixing the pretreated coal-based solid waste with additives, the additives including but not limited to microbial agents, organic fertilizers and minerals;

[0011] S4. Adding a weak acid to the mixture to adjust the pH to 6.5-7, wherein the weak acid is carbonic acid (H2CO3) and acetic acid (CH3COOH);

[0012] S5. fermenting the mixture after adjusting the pH;

[0013] S6. Drying and crushing the fermented mixture to obtain a soil conditioner.

[0014] As an improvement, the coal-based solid waste includes fly ash, coal gangue or a mixture of both.

[0015] As an improvement, the mixing ratio of the fly ash and coal gangue is 2-3:1.

[0016] As an improvement, the amount of microbial agent added in the additive is 1%-5% of the weight of the coal-based solid waste.

[0017] As an improvement, the amount of organic fertilizer added in the additive is 5%-15% of the weight of the coal-based solid waste.

[0018] As an improvement, the amount of minerals added in the additive is 2%-10% of the weight of the coal-based solid waste.

[0019] As an improvement, the temperature of the fermentation treatment is controlled between 30°C and 45°C, and the time is 7-14 days.

[0020] As an improvement, the particle size of the soil conditioner after drying and crushing is 0.1-1.0 mm.

[0021] As an improvement, the mineral substance includes one or more of limestone, vermiculite, oyster shell, diatomaceous earth and peat.

[0022] The advantages of the present invention are:

[0023] 1. The present invention realizes the resource utilization of industrial waste by converting coal-based solid waste into soil conditioner. The present invention not only reduces the pollution of coal-based solid waste to the environment, but also saves land resources and avoids the environmental risks caused by landfill or stacking of solid waste. At the same time, through resource utilization, the exploitation of natural resources is reduced, which is in line with the concept of sustainable development.

[0024] 2. The soil conditioner prepared by the present invention can improve soil structure and soil fertility, thereby increasing soil water retention and air permeability, and providing a better growth environment for plant roots. The present invention can improve crop yield and quality, which is of great significance for sustainable agricultural development and food safety. At the same time, the microbial agents and organic fertilizers in the conditioner can also increase organic matter and trace elements in the soil, promote soil microbial activity, and further improve soil health. DETAILED DESCRIPTION

[0025] In order to make the purpose, method scheme and advantages of the embodiments of the present invention clearer, the method scheme in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1

[0027] This example discloses a method for preparing a soil conditioner by utilizing coal-based solid waste resources, comprising the following steps:

[0028] S1. Collection of coal-based solid waste

[0029] Collect 100 tons of fly ash and 40 tons of coal gangue.

[0030] S2. Preprocessing

[0031] The mixture is crushed, dried and sieved for subsequent processing.

[0032] S3. Mixed additives

[0033] Among them, microbial agent: 2% microbial agent; organic fertilizer: add 10% organic fertilizer; minerals: add 5% limestone and 3% vermiculite.

[0034] S4. Adjust pH: Add carbonic acid (H2CO3) and acetic acid (CH3COOH) to adjust the pH of the mixture to 6.8.

[0035] S5. Fermentation: Fermentation at 35°C for 10 days.

[0036] S6. Drying and pulverizing: The fermented mixture is dried to a moisture content of less than 10%, and pulverized to a soil conditioner with a particle size of 0.5 mm.

[0037] Example 2

[0038] This example discloses a method for preparing a soil conditioner by utilizing coal-based solid waste resources, comprising the following steps:

[0039] S1. Collection of coal-based solid waste

[0040] 120 tons of fly ash and 60 tons of coal gangue were collected.

[0041] S2. Preprocessing

[0042] The mixture is crushed, dried and sieved for subsequent processing.

[0043] S3. Mixed additives

[0044] Among them, microbial agent: 3% microbial agent; organic fertilizer: add 12% organic fertilizer; minerals: add 6% oyster shell and 4% diatomaceous earth.

[0045] S4. Adjust pH: Add carbonic acid (H2CO3) and acetic acid (CH3COOH) to adjust the pH of the mixture to 6.8.

[0046] S5. Fermentation: Fermentation was performed at 40°C for 12 days.

[0047] S6. Drying and pulverizing: The fermented mixture is dried to a moisture content of less than 8%, and pulverized to a soil conditioner with a particle size of 0.8 mm.

[0048] Example 3

[0049] This example discloses a method for preparing a soil conditioner by utilizing coal-based solid waste resources, comprising the following steps:

[0050] S1. Collection of coal-based solid waste

[0051] 150 tons of fly ash and 75 tons of coal gangue were collected.

[0052] S2. Preprocessing

[0053] The mixture is crushed, dried and sieved for subsequent processing.

[0054] S3. Mixed additives

[0055] Among them, microbial agents: 4% microbial agents; organic fertilizer: add 8% organic fertilizer; minerals: add 7% peat.

[0056] S4. Adjust pH: Add carbonic acid (H2CO3) and acetic acid (CH3COOH) to adjust the pH of the mixture to 6.8.

[0057] S5. Fermentation: Fermentation was performed at 30°C for 7 days.

[0058] S6. Drying and pulverizing: The fermented mixture is dried to a moisture content of less than 12%, and pulverized to a soil conditioner with a particle size of 0.3 mm.

[0059] Example 4

[0060] This example discloses a method for preparing a soil conditioner by utilizing coal-based solid waste resources, comprising the following steps:

[0061] S1. Collection of coal-based solid waste

[0062] Collect 200 tons of fly ash and 100 tons of coal gangue.

[0063] S2. Preprocessing

[0064] The mixture is crushed, dried and sieved for subsequent processing.

[0065] S3. Mixed additives

[0066] Among them, microbial agent: 1% microbial agent; organic fertilizer: add 15% organic fertilizer; minerals: add 9% limestone and 1% vermiculite.

[0067] S4. Adjust pH: Add carbonic acid (H2CO3) and acetic acid (CH3COOH) to adjust the pH of the mixture to 6.8.

[0068] S5. Fermentation: Fermentation was performed at 45°C for 14 days.

[0069] S6. Drying and pulverizing: The fermented mixture is dried to a moisture content of less than 12%, and pulverized to a soil conditioner with a particle size of 0.3 mm.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any method personnel familiar with the field of the method can make equivalent replacements or changes according to the method scheme and inventive concept of the present invention within the scope of the method disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a soil conditioner by utilizing coal-based solid waste resources, characterized in that: The method comprises the following steps: S1. Collection of coal-based solid waste; S2. Pre-treatment of coal-based solid waste, including crushing, drying and screening; S3. mixing the pretreated coal-based solid waste with additives, the additives including but not limited to microbial agents, organic fertilizers and minerals; S4. Adding a weak acid to the mixture to adjust the pH to 6.5-7, wherein the weak acid is carbonic acid (H2CO3) and acetic acid (CH3COOH); S5. The pH-adjusted mixture is subjected to fermentation treatment; S6. The fermented mixture is dried and crushed to obtain a soil conditioner.

2. The method for preparing a soil conditioner by utilizing coal-based solid waste as a resource according to claim 1, characterized in that: The coal-based solid waste includes fly ash, coal gangue or a mixture of the two.

3. The method for preparing a soil conditioner by resource utilization of coal-based solid waste according to claim 2, characterized in that: The mixing ratio of the fly ash and coal gangue is 2-3:

1.

4. The method for preparing a soil conditioner by resource utilization of coal-based solid waste according to claim 1, characterized in that: The amount of microbial agent added in the additive is 1%-5% of the weight of the coal-based solid waste.

5. The method for preparing a soil conditioner by resource utilization of coal-based solid waste according to claim 1, characterized in that: The amount of organic fertilizer added in the additive is 5%-15% of the weight of the coal-based solid waste.

6. The method for preparing a soil conditioner by resource utilization of coal-based solid waste according to claim 1, characterized in that: The amount of minerals added in the additive is 2%-10% of the weight of the coal-based solid waste.

7. The method for preparing a soil conditioner by utilizing coal-based solid waste as a resource according to claim 1, characterized in that: The temperature of the fermentation treatment is controlled between 30°C and 45°C, and the time is 7-14 days.

8. The method for preparing a soil conditioner by utilizing coal-based solid waste as a resource according to claim 1, characterized in that: The particle size of the soil conditioner after drying and crushing is 0.1-1.0 mm.

9. The method for preparing a soil conditioner by utilizing coal-based solid waste as a resource according to claim 6, characterized in that: The minerals include one or more of limestone, vermiculite, oyster shells, diatomaceous earth and peat.