Carbon-based soil conditioner based on coal slime as well as preparation method, system and application of carbon-based soil conditioner

Abstract

The invention discloses a carbon-based soil conditioner based on coal slime as well as a preparation method, system and application thereof, and belongs to the technical field of environment-friendly agriculture, the carbon-based soil conditioner is prepared from the following raw materials in parts by mass: 10-90 parts of coal slime, 2-15 parts of an activator, 4-40 parts of a nutrient substance, 10-50 parts of an organic matter and 4-20 parts of a pH value regulator; the activating agent is formed by compounding a sulfuric acid solution, a nitric acid solution and a phosphoric acid solution; the pH value regulator is formed by compounding copper sulfate, ferrous sulfate and monopotassium phosphate. The carbon-based soil conditioner is obtained by activating the coal slime and mixing the activated coal slime with the nutrient substances, the organic matters and the pH value regulator, so that the utilization rate of the coal slime is effectively increased, meanwhile, the soil can be better improved, and the yield and quality of crops can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmentally friendly agriculture, and in particular relates to a carbon-based soil conditioner based on coal slime and a preparation method, system and application thereof. Background Art

[0002] Coal slime refers to a semi-solid substance formed by coal powder containing water, which is alkaline. It mainly includes the flotation tailings of coking coal preparation plants, coal slime produced by coal-water mixtures, coal slime carried by mine drainage, and coal slime washed down by rainwater from waste rock mountains. Due to the many unfavorable conditions of coal slime, such as high moisture, high viscosity, high water holding capacity and low calorific value, it is difficult to make comprehensive use of it. The composition of coal slime is also very complex, containing organic matter and nutrients of different components and contents, such as phosphorus, potassium, calcium, magnesium, sulfur, iron, copper, zinc, manganese, molybdenum, and boron; beneficial elements for plants, such as silicon, titanium, nickel, etc., or harmful heavy metal elements such as lead, cadmium, and chromium. A large number of different types of coal slime are produced every year. In addition to occupying a large amount of land, dry coal slime will produce coal powder, and the coal powder will be blown away by the wind, which will have a serious impact on the ecological environment. If it is not effectively treated, it will greatly endanger people's health.

[0003] Prior art CN112079673A is an organic fertilizer made from coal slime and agricultural products, which directly mixes coal slime with Chinese medicine waste residue to reduce the loss of organic matter, humic acid, active bacteria and other substances in the coal slime. However, the above is to directly utilize coal slime, which contains heavy metal elements, and direct utilization will cause certain damage to the soil. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a carbon-based soil conditioner based on coal slime and a preparation method thereof.

[0005] To achieve the above objectives, the specific technical solutions of the present invention are as follows.

[0006] The first aspect of the present invention provides a carbon-based soil conditioner based on coal slime. The carbon-based soil conditioner is prepared from the following raw materials in parts by mass:

[0007] 10 to 90 parts of coal slime, 2 to 15 parts of activator, 4 to 40 parts of nutrients, 10 to 50 parts of organic matter, and 4 to 20 parts of pH regulator;

[0008] The activator is prepared by compounding sulfuric acid solution, nitric acid solution and phosphoric acid solution; the mass ratio of sulfuric acid solution, nitric acid solution and phosphoric acid solution is 20-22:30-33:50-53;

[0009] The pH value regulator is compounded from copper sulfate, ferrous sulfate and potassium dihydrogen phosphate; the mass ratio of copper sulfate, ferrous sulfate and potassium dihydrogen phosphate is 40-44:30-32:30-32;

[0010] The coal slime-based carbon-based soil conditioner is obtained by first mixing the coal slime with an activator, and then adding a pH value regulator, nutrients and organic matter.

[0011] The activator in the present invention can release the nutrients in the coal slime, thereby fully utilizing the nutrients in the coal slime, thereby increasing the active nutrients in the carbon-based soil conditioner. In addition, the sulfuric acid in the activator and the copper sulfate in the pH regulator both contain sulfate ions, which can form stable sulfates with the harmful heavy metal elements lead, cadmium, chromium and other ions contained in the coal slime, causing them to lose their biological activity, thereby achieving harmless treatment of the coal slime. The conditioning effect of the carbon-based soil conditioner on the soil is further improved by adding nutrients and organic matter.

[0012] In another preferred embodiment, in the activator, the mass percentage concentration of the sulfuric acid solution is 96% to 98%, the mass percentage concentration of the nitric acid solution is 65% to 69%, and the mass percentage concentration of the phosphoric acid solution is 83% to 85%.

[0013] In another preferred embodiment, the nutrient is compounded from calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag; and the organic matter is compounded from straw, sawdust, chicken manure and kitchen waste.

[0014] In another preferred embodiment, the mass ratio of calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag in the nutrient is 10-12:40-43:30-33:20-22. The calcium, magnesium, potassium, phosphorus and other elements contained in the biomass ash can provide nutrients for the soil and improve the nutrient absorption capacity of plants; the pore structure in the water-quenched slag can increase the porosity and air permeability of the soil; the boron slag can provide boron elements, promote the root development of crops and the photosynthesis of leaves, and improve the yield and quality of crops.

[0015] In another preferred embodiment, the mass ratio of straw, sawdust, chicken manure and kitchen waste in the organic matter is 30-33:20-22:20-22:30-33.

[0016] The second aspect of the present invention provides a method for preparing a carbon-based soil conditioner, wherein the carbon-based soil conditioner is the carbon-based soil conditioner provided in the first aspect of the present invention, comprising the following steps:

[0017] Weigh each raw material according to the mass ratio;

[0018] Slice the coal slime, ball-mill, and sieve to obtain coal slime powder, and mix the coal slime powder with an activator to obtain activated coal slime;

[0019] The activated coal slime is mixed with a pH regulator, nutrients and organic matter, granulated, dried, cooled and sieved to obtain a carbon-based soil conditioner.

[0020] The specific surface area of ​​coal slime can be increased after ball milling. After activation by an activator, pits will be formed on the surface of the coal slime, further increasing the specific surface area of ​​the coal slime powder particles. Through the combined action of ball milling and activator, the contact area between coal slime and soil is expanded, making the obtained carbon-based soil conditioner more conducive to soil adsorption and plant absorption.

[0021] In another preferred embodiment of the present invention, the chemical activation time is 3 min to 10 min; the temperature is 5° C. to 40° C.; and the sieving mesh size is 80 mesh to 200 mesh to increase the specific surface area of ​​the coal slime.

[0022] In another preferred embodiment of the present invention, the particle size of the carbon-based soil conditioner is 2 mm to 6 mm.

[0023] The third aspect of the present invention provides an application of a carbon-based soil conditioner based on coal slime in increasing crop yields, wherein the carbon-based soil conditioner based on coal slime is the carbon-based soil conditioner based on coal slime provided in the first aspect of the present invention.

[0024] The fourth aspect of the present invention provides a system for preparing a carbon-based soil conditioner based on coal slime, wherein the carbon-based soil conditioner based on coal slime is provided by the first aspect of the present invention, and the system for preparing a carbon-based soil conditioner based on coal slime comprises a coal slime slicer, a coal slime dryer 5, a ball mill 6, an activation mixer 7, a stirring mixer 11, a granulator 17, a dryer 19, a cooler 20, a sieving machine 21, a packaging machine 23, a loader 24 and a finished product warehouse connected in sequence;

[0025] A crusher 22 is connected to the bottom of the sieving machine 21 for crushing particles at the bottom of the sieving machine 21 . The crusher 22 is connected to the granulator 17 .

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention can release a large amount of nutrients in the coal slime through the activator, effectively increasing the active nutrients of the carbon-based soil conditioner. The sulfuric acid in the activator and the copper sulfate in the pH regulator both contain sulfate ions, which can form stable sulfates with the harmful heavy metal elements such as lead, cadmium, and chromium contained in the coal slime, causing them to lose their biological activity, thereby achieving harmless treatment of the coal slime. By adding nutrients and organic matter, the quality and application effect of the carbon-based soil conditioner are significantly better than similar soil conditioners and fertilizers, which can better improve the soil, increase soil fertility, increase crop yields, and improve the quality of agricultural products. The carbon-based soil conditioner in the present invention eliminates the pollution of the ecological environment by coal slime and realizes the comprehensive utilization of resources.

[0028] (2) In the preparation of the carbon-based soil conditioner, the coal slime is first ball-milled to significantly increase the specific surface area of ​​the coal slime powder particles, and then an activator is used to form pits of different sizes on the surface of the coal slime, further increasing the specific surface area of ​​the coal slime powder particles. The combination of ball milling and the activator effectively increases the contact area between the coal slime and the soil, and the obtained carbon-based soil conditioner is more conducive to soil adsorption and plant absorption.

[0029] (3) The present invention can better release the nutrients in the coal slime, greatly improving the utilization rate of plant nutrients in the coal slime. Compared with the prior art, the harmless treatment and comprehensive resource utilization are more thorough. The present invention requires less equipment investment, has low resource utilization cost, excellent product quality, and good application effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a system of a carbon-based soil conditioner based on coal slime in an embodiment of the present invention.

[0031] Explanation of the reference numerals in the accompanying drawings: 1 - coal slime yard, 2 - coal slime transport vehicle, 3 - coal slime storage yard, 4 - coal slime slicer, 5 - coal slime dryer, 6 - ball mill, 7 - activation mixer, 8 - spray gun, 9 - hose, 10 - activator storage tank, 11 - stirring mixer, 12 - metering device, 13 - nutrient feed hopper, 14 - organic matter feed hopper, 15 - pH adjuster feed hopper, 16 - tail gas dust removal system, 17 - granulator, 18 - spraying device, 19 - dryer, 20 - cooler, 21 - screening machine, 22 - crusher, 23 - packaging machine, 24 - loader, 25 - finished product warehouse. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Unless otherwise specified, the experimental methods described in the following examples are all conventional methods; the reagents and materials described are all commercially available unless otherwise specified.

[0034] The biomass ash comes from the biomass power plant, the water-quenched slag comes from the ironmaking waste slag, and the boron slag comes from the boron mine waste slag; the particle size of the water-quenched slag and the boron slag is 80 mesh to 200 mesh.

[0035] The coal slime-based carbon-based soil conditioners in the following examples are all prepared by using a coal slime-based carbon-based soil conditioner system, such as Figure 1 As shown, the system of the coal slime-based carbon-based soil conditioner comprises:

[0036] The outlet of the coal slime slicer 4 is connected to the inlet of the coal slime dryer 5 through a conveyor belt; the outlet of the coal slime dryer 5 is connected to the inlet of the ball mill 6 through a conveyor belt. The outlet of the ball mill 6 is connected to the inlet of the activation mixer 7 through a conveyor belt. The top of the activation mixer 7 is provided with a spray gun 8, which is connected to the activator storage tank 10 through a hose 9. The activator storage tank 10 is provided with an activator for activating the coal slime; the outlet of the activation mixer 7 is connected to the inlet of the mixing mixer 11 through a conveyor belt. The top of the mixing mixer 11 is respectively provided with three nutrient feeding hoppers 13 with metering devices 12, an organic matter feeding hopper 14, and a pH value adjusting agent feeding hopper 15. The bottom of the mixing mixer 11 is provided with an exhaust dust removal system 16. The outlet of the mixing mixer 11 is connected to the inlet of the activation mixer 7 through a conveyor belt. The inlet of the granulator 17 is connected, a spraying device 18 is provided on the top of the granulator 17, the outlet of the granulator 17 is connected to the inlet of the dryer 19 through a conveyor belt, the outlet of the dryer 19 is connected to the inlet of the cooler 20 through a conveyor belt, the outlet of the cooler 20 is connected to the inlet of the sifter 21 through a conveyor belt, the outlet of the sifter 21 is connected to the inlet of the packaging machine 23 through a conveyor belt, the outlet of the sifter 21 is connected to the inlet of the granulator 17 through a conveyor belt, the top of the granulator 17 sends the sieved residual granular material to the pulverizer 22 through a conveyor belt, and the pulverizer 22 is connected to the granulator 17 through a conveyor belt.

[0037] The specific process of the coal slime-based carbon-based soil conditioner system is as follows:

[0038] The coal slime is transported from the coal slime yard 1 to the coal slime storage yard 3 by a coal slime special transport vehicle 2, and then sent to the coal slime slicer 4 by a conveyor belt. After the coal slime is sliced, it is sent to the coal slime dryer 5 by a conveyor belt for drying. The dried coal slime powder is sent to the ball mill 6, and then sent to the activation mixer 7 by a conveyor belt after ball milling. The top of the activation mixer 7 is provided with a spray gun 8 and a coal slime activator storage tank 10. The spray gun 8 sprays the coal slime activator into the activation mixer 7 and stirs it to further activate the coal slime powder. The ground and activated coal slime powder is sent to a stirring mixer 11 through a conveyor belt. Three nutrient feeding hoppers 13, an organic matter feeding hopper 14 and a pH regulator feeding hopper 15 with metering devices 12 are respectively arranged on the top of the stirring mixer 11. The coal slime powder, nutrients, organic matter and pH regulator are mixed by the stirring mixer 11 and then sent to a granulator 17. A spraying device 18 is arranged on the top of the granulator 17. The spraying device 18 sprays water or steam into the granulator 17 for granulation.

[0039] The granular material after granulation is sent to the dryer 19 for drying. The dried material is sent to the cooler 20. The material is cooled to below 40°C and sent to the screening machine 21 for screening. The screened 2mm to 6mm particles are sent to the packaging machine 23 for packaging as a carbon-based soil conditioner. The packaged product is transported to the finished product warehouse 25 by the loader 24. The remaining granular material after screening by the screening machine 21 is crushed by the crusher 22 and sent to the granulator 17 with the powder for re-granulation.

[0040] Example 1

[0041] A carbon-based soil conditioner based on coal slime is prepared from the following raw materials, calculated by mass fraction: 10 parts of coal slime, 2 parts of activator, 4 parts of nutrients, 10 parts of organic matter, and 4 parts of pH regulator; wherein the coal slime comes from flotation tail coal of a coking coal preparation plant.

[0042] The activator is compounded from a sulfuric acid solution, a nitric acid solution and a phosphoric acid solution; wherein the mass ratio of the sulfuric acid solution, the nitric acid solution and the phosphoric acid solution is 20:30:50; the mass percentage concentration of the sulfuric acid solution is 98%, the mass percentage concentration of the nitric acid solution is 69%, and the mass percentage concentration of the phosphoric acid solution is 85%.

[0043] The nutrient is compounded from calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag; wherein the mass ratio of calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag is 10:40:30:20.

[0044] The organic matter is compounded from straw, sawdust, chicken manure and kitchen waste; wherein the mass ratio of straw, sawdust, chicken manure and kitchen waste is 30:20:20:30.

[0045] The pH regulator includes copper sulfate, ferrous sulfate and potassium dihydrogen phosphate; wherein the mass ratio of copper sulfate, ferrous sulfate and potassium dihydrogen phosphate is 40:30:30.

[0046] The coal slime needs to be sliced ​​and dried before use; the thickness of the slices is 6 mm; and the drying temperature is 80°C.

[0047] The method for preparing the above-mentioned coal slime-based carbon-based soil conditioner comprises the following steps:

[0048] S1. Coal slime is transported from the coal slime yard 1 to the coal slime storage yard 3 by a coal slime special transport vehicle 2, and then sent to the coal slime slicer 4 by a conveyor belt to slice the coal slime. The thickness of the slices is 6 mm. After slicing, the coal slime is sent to the coal slime dryer 5 by a conveyor belt and dried at 80°C. The dried coal slime powder is sent to the ball mill 6. After ball milling, 80-mesh coal slime powder is obtained. The coal slime powder is sent to the activation mixer 7 by a conveyor belt. A spray gun 8 and a coal slime activator storage tank 10 are provided on the top of the activation mixer 7. The spray gun 8 sprays the coal slime activator into the activation mixer 7 and stirs it. The coal slime powder and the activator are mixed at 5°C and activated for 3 minutes to obtain activated coal slime.

[0049] S2. The activated coal slime is sent to the stirring mixer 11 through a conveyor belt. Three nutrient feeding hoppers 13, organic matter feeding hopper 14 and pH value adjusting agent feeding hopper 15 with metering devices 12 are respectively arranged on the top of the stirring mixer 11. The nutrients, organic matter and pH value adjusting agent of the activated coal slime are mixed by the activation mixer 7 and sent to the granulator 17. A spraying device 18 is arranged on the top of the granulator 17. The spraying device 18 sprays water or steam into the granulator 17 for granulation. The granulated granular material is sent to the dryer 19 for drying. The dried material is sent to the cooler 20. The material is cooled to 35° C. and sent to the screening machine 21 for screening. The screened granules of 2mm to 6mm are sent to the packaging machine 23 for packaging as carbon-based soil conditioners. The packaged products are transported to the finished product warehouse 25 by the loader 24. The granular material remaining after screening is crushed by the crusher 22 and sent to the granulator 17 with the powder for re-granulation.

[0050] Example 2

[0051] A carbon-based soil conditioner based on coal slime, which comprises the following raw materials, measured by mass fraction: 50 parts of coal slime, 10 parts of activator, 20 parts of nutrients, 25 parts of organic matter, and 15 parts of pH regulator; wherein the coal slime comes from the coal slime produced from a coal-water mixture.

[0052] The activator is compounded from a sulfuric acid solution, a nitric acid solution and a phosphoric acid solution; wherein the mass ratio of the sulfuric acid solution, the nitric acid solution and the phosphoric acid solution is 21:31:52; the mass percentage concentration of the sulfuric acid solution is 98%, the mass percentage concentration of the nitric acid solution is 69%, and the mass percentage concentration of the phosphoric acid solution is 85%.

[0053] The nutrient is compounded from calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag; wherein the mass ratio of calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag is 11:42:31:21.

[0054] The organic matter is compounded from straw, sawdust, chicken manure and kitchen waste; wherein the mass ratio of straw, sawdust, chicken manure and kitchen waste is 31:21:22:31.

[0055] The pH regulator includes copper sulfate, ferrous sulfate and potassium dihydrogen phosphate; wherein the mass ratio of copper sulfate, ferrous sulfate and potassium dihydrogen phosphate is 42:31:31.

[0056] The coal slime needs to be sliced ​​and dried before use; the thickness of the slices is 8 mm; and the drying temperature is 100°C.

[0057] The method for preparing the above-mentioned coal slime-based carbon-based soil conditioner comprises the following steps:

[0058] S1. Coal slime is transported from the coal slime yard 1 to the coal slime storage yard 3 by a coal slime special transport vehicle 2, and then sent to the coal slime slicer 4 by a conveyor belt to slice the coal slime. The thickness of the slices is 8 mm. After slicing, the coal slime is sent to the coal slime dryer 5 by a conveyor belt and dried at 100°C. The dried coal slime powder is sent to the ball mill 6. After ball milling, 100-mesh coal slime powder is obtained. The coal slime powder is sent to the activation mixer 7 by a conveyor belt. A spray gun 8 and a coal slime activator storage tank 10 are provided on the top of the activation mixer 7. The spray gun 8 sprays the coal slime activator into the activation mixer 7 and stirs it. The coal slime powder and the activator are mixed at 20°C and activated for 5 minutes to obtain activated coal slime.

[0059] S2. The activated coal slime is sent to the stirring mixer 11 through a conveyor belt. Three nutrient feeding hoppers 13, organic matter feeding hopper 14 and pH value adjusting agent feeding hopper 15 with metering devices 12 are respectively arranged on the top of the stirring mixer 11. The nutrients, organic matter and pH value adjusting agent of the activated coal slime are mixed by the activation mixer 7 and sent to the granulator 17. A spraying device 18 is arranged on the top of the granulator 17. The spraying device 18 sprays water or steam into the granulator 17 for granulation. The granulated granular material is sent to the dryer 19 for drying. The dried material is sent to the cooler 20. The material is cooled to 30° C. and sent to the screening machine 21 for screening. The screened granules of 2mm to 6mm are sent to the packaging machine 23 for packaging as carbon-based soil conditioners. The packaged products are transported to the finished product warehouse 25 by the loader 24. The granular material remaining after screening is crushed by the crusher 22 and sent to the granulator 17 with the powder for re-granulation.

[0060] Example 3

[0061] A carbon-based soil conditioner based on coal slime, which comprises the following raw materials, measured by mass fraction: 90 parts of coal slime, 15 parts of activator, 40 parts of nutrients, 50 parts of organic matter, and 20 parts of pH regulator; wherein the coal slime comes from the coal slime entrained in mine drainage.

[0062] The activator is compounded from sulfuric acid solution, nitric acid solution and phosphoric acid solution; the mass ratio of the sulfuric acid solution, the nitric acid solution and the phosphoric acid solution is 22:33:53; the mass percentage concentration of the nitric acid solution is 69%, and the mass percentage concentration of the phosphoric acid solution is 85%.

[0063] The nutrient is compounded from calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag; wherein the mass ratio of calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag is 12:43:33:22.

[0064] The organic matter is compounded from straw, sawdust, chicken manure and kitchen waste; wherein the mass ratio of straw, sawdust, chicken manure and kitchen waste is 33:22:22:33.

[0065] The pH regulator includes copper sulfate, ferrous sulfate and potassium dihydrogen phosphate; wherein the mass ratio of copper sulfate, ferrous sulfate and potassium dihydrogen phosphate is 44:32:32.

[0066] The coal slime needs to be sliced ​​and dried before use; the thickness of the slices is 10 mm; and the drying temperature is 200°C.

[0067] The method for preparing the above-mentioned coal slime-based carbon-based soil conditioner comprises the following steps:

[0068] S1. Coal slime is transported from the coal slime yard 1 to the coal slime storage yard 3 by a coal slime special transport vehicle 2, and then sent to the coal slime slicer 4 by a conveyor belt to slice the coal slime. The thickness of the slices is 10 mm. After slicing, the coal slime is sent to the coal slime dryer 5 by a conveyor belt and dried at 200°C. The dried coal slime powder is sent to the ball mill 6. After ball milling, 200-mesh coal slime powder is obtained. The coal slime powder is sent to the activation mixer 7 by a conveyor belt. A spray gun 8 and a coal slime activator storage tank 10 are provided on the top of the activation mixer 7. The spray gun 8 sprays the coal slime activator into the activation mixer 7 and stirs it. The coal slime powder and the activator are mixed at 40°C and activated for 10 minutes to obtain activated coal slime.

[0069] S2. The activated coal slime is sent to the stirring mixer 11 through a conveyor belt. Three nutrient feeding hoppers 13, organic matter feeding hopper 14 and pH value adjusting agent feeding hopper 15 with metering devices 12 are respectively arranged on the top of the stirring mixer 11. The nutrients, organic matter and pH value adjusting agent of the activated coal slime are mixed by the activation mixer 7 and sent to the granulator 17. A spraying device 18 is arranged on the top of the granulator 17. The spraying device 18 sprays water or steam into the granulator 17 for granulation. The granulated granular material is sent to the dryer 19 for drying. The dried material is sent to the cooler 20. The material is cooled to 35° C. and sent to the screening machine 21 for screening. The screened granules of 2mm to 6mm are sent to the packaging machine 23 for packaging as carbon-based soil conditioners. The packaged products are transported to the finished product warehouse 25 by the loader 24. The granular material remaining after screening is crushed by the crusher 22 and sent to the granulator 17 with the powder for re-granulation.

[0070] Comparative Example 1

[0071] A carbon-based soil conditioner based on coal slime, which is the same as Example 2 except that there is no nutrient substance. The carbon-based soil conditioner is prepared from the following raw materials, measured by mass fraction: 50 parts of coal slime, 10 parts of activator, 25 parts of organic matter, and 15 parts of pH regulator; wherein the coal slime comes from the coal slime produced from a coal-water mixture.

[0072] The activator is compounded from a sulfuric acid solution, a nitric acid solution and a phosphoric acid solution; the mass ratio of the sulfuric acid solution, the nitric acid solution and the phosphoric acid solution is 21:31:52; the mass percentage of the sulfuric acid solution is 98%, the mass percentage of the nitric acid solution is 69%, and the mass percentage of the phosphoric acid solution is 85%.

[0073] The organic matter is compounded from straw, sawdust, chicken manure and kitchen waste; wherein the mass ratio of straw, sawdust, chicken manure and kitchen waste is 31:21:22:31.

[0074] The pH value regulator is compounded by copper sulfate, ferrous sulfate and potassium dihydrogen phosphate; wherein the mass ratio of copper sulfate, ferrous sulfate and potassium dihydrogen phosphate is 42:31:31.

[0075] The coal slime needs to be sliced ​​and dried before use; the thickness of the slices is 8 mm; and the drying temperature is 100°C.

[0076] The method for preparing the above-mentioned coal slime-based carbon-based soil conditioner comprises the following steps:

[0077] S1. Grinding the coal slime to 100 meshes with a ball mill to increase the specific surface area of ​​the coal slime. Mixing the ball-milled coal slime with an activator at 20° C. and activating the mixture for 5 minutes to obtain activated coal slime.

[0078] S3. Mix the chemically activated coal slime with organic matter and pH regulator, granulate, spray water during granulation, dry, cool to 30°C, and sieve out particles with a particle size of 2mm to 6mm, which are carbon-based soil conditioners; crush the remaining particles and re-granulate.

[0079] In order to further demonstrate the effect of the carbon-based soil conditioner in the present invention, we conducted the following experiment: an experimental plot was divided into 6 parts, and peanuts of the same density and variety were planted on each plot; 3 of them were applied with the carbon-based soil conditioners in Examples 1 to 3 of the present invention as the experimental group; one was applied with the carbon-based soil conditioner in Comparative Example 1, and one was applied with silicon calcium potassium, a soil conditioner commonly used in the market, and the above two were used as the control group; one was not applied with any soil conditioner, as the blank group. Among them, the application amount of the above soil conditioners was 75kg / mu, the application method was broadcasting and bottom application, and the application time was before land preparation and plowing. The peanut yield was statistically analyzed separately, and the results are shown in Table 1.

[0080] Table 1 Experimental results on peanut yield after planting using different carbon-based soil conditioners

[0081]

[0082] From the results in Table 1, it can be seen that the use of the soil conditioners in Examples 1 to 3 of the present invention can effectively increase the yield of peanuts, indicating that the soil conditioners in Examples 1 to 3 of the present invention are more conducive to plant growth than the blank group and the control group, and can better improve the soil and improve soil fertility, thereby significantly increasing the yield of peanuts.

[0083] From the results of Comparative Example 1 and Examples 1 to 3, it can be seen that without adding nutrients, the effect of the soil conditioner is greatly affected. The calcium, magnesium, potassium, phosphorus and other elements contained in the biomass ash in the nutrients can provide nutrients for the soil and improve the nutrient absorption capacity of the plant; the pore structure in the water-quenched slag can increase the porosity and air permeability of the soil; the boron slag can provide boron elements, promote the root development of crops and the photosynthesis of leaves, and improve the yield and quality of crops. In Comparative Example 1, if no nutrients are added, it will affect the normal growth of plants and then affect the crop yield. At the same time, there is a certain synergistic effect between different nutrients to promote better growth of plants.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon-based soil conditioner based on coal slime, It is characterized in that The carbon-based soil conditioner is prepared from the following raw materials in parts by mass: 10 to 90 parts of coal slime, 2 to 15 parts of activator, 4 to 40 parts of nutrients, 10 to 50 parts of organic matter, 4 to 20 parts of pH regulator; The activator is prepared by compounding sulfuric acid solution, nitric acid solution and phosphoric acid solution; the mass ratio of sulfuric acid solution, nitric acid solution and phosphoric acid solution is 20-22:30-33:50-53; The pH value regulator is compounded from copper sulfate, ferrous sulfate and potassium dihydrogen phosphate; the mass ratio of copper sulfate, ferrous sulfate and potassium dihydrogen phosphate is 40-44:30-32:30-32; The coal slime-based carbon-based soil conditioner is obtained by first mixing the coal slime with an activator, and then adding a pH value regulator, nutrients and organic matter.

2. A carbon-based soil conditioner based on coal slime according to claim 1, It is characterized in that In the activator, the mass percentage concentration of the sulfuric acid solution is 96% to 98%, the mass percentage concentration of the nitric acid solution is 65% to 69%, and the mass percentage concentration of the phosphoric acid solution is 83% to 85%.

3. A carbon-based soil conditioner based on coal slime according to claim 1, It is characterized in that The nutrient is compounded from calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag; the organic matter is compounded from straw, sawdust, chicken manure and kitchen waste.

4. A carbon-based soil conditioner based on coal slime according to claim 3, It is characterized in that Among the nutrients, the mass ratio of calcium ammonium nitrate, biomass ash, water-quenched slag and boron slag is 10-12:40-43:30-3:20-22.

5. A carbon-based soil conditioner based on coal slime according to claim 3, It is characterized in that Among the organic matter, the mass ratio of straw, sawdust, chicken manure and kitchen waste is 30-33:20-22:20-22:30-33.

6. A method for preparing the carbon-based soil conditioner according to any one of claims 1 to 5, It is characterized in that The following steps are involved: Weigh each raw material according to the mass ratio; Slice the coal slime, ball-mill, and sieve to obtain coal slime powder, mix the coal slime powder with an activator, and activate it to obtain activated coal slime; The activated coal slime is mixed with a pH regulator, nutrients and organic matter, granulated and dried to obtain a carbon-based soil conditioner.

7. The method for preparing a carbon-based soil conditioner according to claim 6, It is characterized in that The activation time is 3 min to 10 min, and the activation temperature is 5° C. to 40° C.; The mesh size for sieving is 80 to 200 mesh.

8. The method for preparing a carbon-based soil conditioner according to claim 6, It is characterized in that The particle size of the carbon-based soil conditioner is 2 mm to 6 mm.

9. Use of the coal slime-based carbon-based soil conditioner according to claim 1 in increasing crop yields.

10. A system for preparing the coal slime-based carbon-based soil conditioner of claim 1, It is characterized in that The system of the coal slime-based carbon-based soil conditioner comprises a coal slime slicer (4), a coal slime dryer (5), a ball mill (6), an activation mixer (7), a stirring mixer (11), a granulator (17), a dryer (19), a cooler (20), a sifter (21), a packaging machine (23), a loader (24) and a finished product warehouse (25) which are connected in sequence; The bottom of the sieving machine (21) is connected to a crusher (22) for crushing the particles at the bottom of the sieving machine (21), and the crusher (22) is connected to the granulator (17).

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