CN108905040B - Preparation and application method of incineration fly ash heavy metal stabilizing medicament - Google Patents
Preparation and application method of incineration fly ash heavy metal stabilizing medicament Download PDFInfo
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- CN108905040B CN108905040B CN201810742031.2A CN201810742031A CN108905040B CN 108905040 B CN108905040 B CN 108905040B CN 201810742031 A CN201810742031 A CN 201810742031A CN 108905040 B CN108905040 B CN 108905040B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
- A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
- A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/08—Toxic combustion residues, e.g. toxic substances contained in fly ash from waste incineration
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D2101/00—Harmful chemical substances made harmless, or less harmful, by effecting chemical change
- A62D2101/40—Inorganic substances
- A62D2101/43—Inorganic substances containing heavy metals, in the bonded or free state
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Abstract
The invention discloses a preparation method and an application method of an incineration fly ash heavy metal stabilizing agent. The preparation method comprises the following steps: (1) pretreating biomass; (2) ultrasonic liquid phase dispersion; (3) carbonizing; (4) and (5) post-treatment. The application method comprises the following steps: and mixing the incineration fly ash heavy metal stabilizing agent with the incineration fly ash, adding crystal, fully stirring and then maintaining. The preparation method of the incineration fly ash heavy metal stabilizing medicament optimizes the original source and reaction conditions, has mild reaction conditions, is easy for large-scale production, simultaneously obtains good adsorption and fixation effects, has comprehensive stabilization effect on incineration fly ash with complex heavy metal components and low leaching rate, and can realize safe landfill of the treated incineration fly ash.
Description
Technical Field
The invention belongs to the technical field of hazardous waste pollution remediation, and particularly relates to a preparation method and an application method of an incineration fly ash heavy metal stabilizing medicament.
Background
Along with the enlargement of the urban scale in China, the improvement of the economic level and the living standard of people, the quantity of garbage generated by cities is increasing day by day, and an incineration method is used as a novel urban garbage treatment technology, becomes a main disposal mode of urban garbage due to the advantages of good volume reduction, high harmless degree, high heat energy utilization rate and the like, and is widely popularized and applied in recent years. However, incineration fly ash generated in the incineration process is used as hazardous waste, the leaching toxicity of heavy metals is high, and a large environmental risk exists. At present, the solidification and stabilization technology is the most common incineration fly ash disposal method, and different types of chelating agents are utilized to perform a series of reactions such as precipitation, adsorption, ion exchange, oxidation reduction and the like with heavy metals in fly ash, so that the leaching toxicity of the incineration fly ash is lower than the landfill standard limit value of a refuse landfill.
The biochar is obtained by utilizing the pyrolysis charcoal burning of solid wastes such as biomass under the anoxic or anaerobic condition, has the characteristics of large specific surface area, developed pore distribution, stable chemical property and more organic functional groups, and has good heavy metal adsorption effect. The alkaline industrial solid waste is a large amount of solid waste discharged in the industrial generation process of aluminum, iron, gold and the like, has low overall comprehensive utilization rate, but has strong alkalinity and large specific surface area, and can reduce the leaching toxicity of heavy metals.
At present, modified biochar aiming at single heavy metal exists, however, the modified biochar aims at single metal treatment, the fixing effect on complex heavy metal components of incineration fly ash is poor, and heavy metal leaching risks still exist.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a preparation method and an application method of a incineration fly ash heavy metal stabilizing medicinal agent, aiming at forming modified biochar by compounding and carbonizing biomass and alkaline industrial solid waste, adsorbing and fixing heavy metal components of incineration fly ash with complex heavy metal components, and reducing the leaching rate of the heavy metal to a safe line, thereby solving the technical problem that the existing modified biochar has poor treatment effect on the complex heavy metal components.
In order to achieve the above object, according to one aspect of the present invention, there is provided a method for preparing an incineration fly ash modified biochar chelate, comprising the steps of:
(1) biomass pretreatment: drying the biomass in the air, drying to constant weight, and grinding into powder to obtain biomass powder; the biomass comprises cellulose-derived biomass and amorphous biomass, and the cellulose-derived biomass is plant residue; the amorphous biomass is animal remains or excrement;
(2) ultrasonic liquid phase dispersion: uniformly dispersing the biomass powder obtained in the step (1) and alkaline industrial solid waste powder in a liquid phase to obtain a precursor suspension; the alkaline industrial solid waste is selected from red mud, ferrochrome slag, gold tailings, steel slag and the like, and the liquid phase is preferably distilled water; the mass ratio of the alkaline industrial solid waste to the liquid phase is between 1:150 and 1: 300; the mass ratio of the biomass to the alkaline industrial solid waste powder is between 2:1 and 8: 1;
(3) carbonizing: roasting a solid phase obtained after solid-liquid separation is carried out on the precursor suspension liquid obtained in the step (2) in an oxygen-free environment until the biomass is carbonized to obtain a carbide;
(4) and (3) post-treatment: and (4) cleaning, drying and grinding the carbide obtained in the step (3) to obtain the incineration fly ash modified biochar chelating agent.
Preferably, in the preparation method of the incineration fly ash modified biochar chelating agent, the specification of the biomass powder in the step (1) is 20-100 meshes.
Preferably, the incineration fly ash modified biochar chelating agent is prepared by the method that the specific surface area of the solid phase in the step (2) is 200m 2 G to 230m 2 /g。
Preferably, the preparation method of the incineration fly ash modified biochar chelating agent comprises the following specific steps of (2):
ultrasonically dispersing alkaline industrial solid waste powder into a liquid phase to form a suspension, then adding the biomass powder into the suspension, and stirring for 2-8 hours.
Preferably, in the preparation method of the incineration fly ash modified biochar chelating agent, the carbonization temperature in the step (3) is 350-600 ℃, and the carbonization time is 3-6 hours.
Preferably, the preparation method of the incineration fly ash modified biochar chelating agent comprises the following specific steps of (4):
and (4) washing the carbide obtained in the step (3) by using deionized water until salt ions in leacheate are constant, drying, grinding and sieving to obtain the modified biochar.
Preferably, in the preparation method of the incineration fly ash modified biochar chelating agent, salt segregants are constantly calibrated by adopting the conductivity, and are ground and sieved by 60-100 meshes.
Preferably, the incineration fly ash modified biochar chelating agent is prepared by the steps of (1) the cellulose-derived biomass;
the specific surface area of the solid phase in the step (2) is 200m 2 G to 230m 2 /g；
The carbonization temperature of the step (3) is 350 ℃ to 450 ℃, and the carbonization time is 3 hours to 4 hours;
according to another aspect of the invention, the application method of the incineration fly ash modified biochar chelating agent prepared by the method comprises the following steps:
and mixing the incineration fly ash modified biochar chelating agent with the incineration fly ash, adding crystal, fully stirring and then maintaining.
Preferably, in the application method, the incineration fly ash modified biochar chelating agent and the incineration fly ash are mixed by mass at a ratio of 5-12%, the water and the incineration fly ash are mixed by mass at a ratio of 25-60%, the stirring time is 5-20 minutes, and the maintenance time is not less than 3 days.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the preparation method of the modified biochar optimizes the original source and reaction conditions, has mild reaction conditions, is easy for large-scale production, simultaneously obtains good adsorption and fixation effects, has comprehensive stabilization effect on incineration fly ash with complex heavy metal components and low leaching rate, and can realize safe landfill of the treated incineration fly ash.
In addition, raw materials required by the preparation of the modified biochar are solid wastes, so that the wastes are treated by the wastes, and the preparation method conforms to the concepts of sustainable development and solid waste recycling.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a preparation method of an incineration fly ash modified biochar chelating agent, which comprises the following steps:
(1) biomass pretreatment: drying the biomass in the air, drying to constant weight, and grinding into powder to obtain biomass powder; the biomass includes cellulose-derived biomass such as straw, bagasse and other plant residues, and amorphous biomass; the amorphous biomass earthworm manure, the cattle manure and other animal remains and excrement and the like. The specification of the biomass powder is 20-100 meshes.
(2) Ultrasonic liquid phase dispersion: uniformly dispersing the biomass powder obtained in the step (1) and alkaline industrial solid waste powder in a liquid phase to obtain a precursor suspension; the alkaline industrial solid waste is selected from red mud, ferrochrome slag, gold tailings, steel slag and the like, and the liquid phase is preferably distilled water; the mass ratio of the alkaline industrial solid waste to the liquid phase is between 1:150 and 1: 300; the mass ratio of the biomass to the alkaline industrial solid waste powder is 2:1 to 8:1, preferably 8: 1. The specific surface area of the solid phase is 200m 2 G to 230m 2 /g。
Specifically, alkaline industrial solid waste powder is ultrasonically dispersed in a liquid phase to form a suspension, and then the biomass powder is added to the suspension and stirred for 2 to 8 hours.
(3) Carbonizing: roasting a solid phase obtained after solid-liquid separation is carried out on the precursor suspension obtained in the step (2) in an oxygen-free environment until the biomass is carbonized to obtain a carbonized substance; the carbonization temperature is 350 ℃ to 600 ℃, preferably 350 ℃ to 450 ℃, and the carbonization time is 3 hours to 6 hours, preferably 3 hours to 4 hours.
(4) And (3) post-treatment: and (4) cleaning, drying and grinding the carbide obtained in the step (3) to obtain the incineration fly ash modified biochar chelating agent.
Specifically, the carbide obtained in the step (3) is washed by deionized water until salt separating particles in the leacheate are constant, and then the modified biochar is obtained by drying, grinding and sieving. Wherein the salt ion constancy can be calibrated by conductivity (measured by conductivity meter), and the grinding and sieving mesh number range is 60-100 meshes.
The biochar chelating agent provided by the invention is modified biochar formed by combining biochar and alkaline industrial solid waste powder according to a certain proportion, wherein the biochar has the function of adsorbing heavy metals, and the alkaline industrial solid waste has the function of changing the chemical form of the heavy metals in incineration fly ash and reducing the leaching toxicity of the heavy metals. The presence form of the biochar and the combination form of the alkaline industrial solid waste and the biochar thus determine the adsorption effect and the immobilization effect of the heavy metals.
A large number of experiments show that the source and the property of the biomass determine the adsorption effect of the final modified biochar to a great extent, and the dispersion method, the proportion of the biomass to the alkaline industrial waste and the carbonization parameters influence the adsorption effect and the fixing effect. Meanwhile, different biomass sources have different tolerance to carbonization parameters. Through continuous exploration and selection, the modified biochar prepared from biomass from cellulose has better adsorption effect on various heavy metals including lead, cadmium and arsenic, such as plant residues including straws, bagasse and the like, wherein the effect of the straws and the bagasse is better. Meanwhile, the modified biomass has certain sensitivity to carbonization conditions in the preparation process, namely different carbonization conditions obviously influence the adsorption effect of the modified biochar on heavy metals, which is probably because the carbonization parameters directly influence the micro-morphological structure of the biochar. Simultaneous carbonization parameterAlso affects the combination form of the alkaline industrial solid waste and the biochar, so the selection of the carbonization parameters is strict: firstly, the roasting temperature is lower than that in the common preparation of the biochar, the common roasting temperature is generally above 500 ℃, the roasting temperature in the carbonization of the incineration fly ash modified biochar chelating agent provided by the invention is 350-600 ℃, and the preferable temperature of the cellulose source is 350-450 ℃; meanwhile, the roasting time is shorter during carbonization, the roasting time is 3 to 6 hours, and the biomass from cellulose is preferably 3 to 4 hours; in addition, as the roasting temperature is low and the roasting time is short, the carbonization effect of the biomass is ensured, the ratio of the biomass to the alkaline industrial solid waste powder in the precursor suspension and the specific surface area of the solid phase obtained after solid-liquid separation in the step (3) are important, wherein the mass ratio of the biomass to the alkaline industrial solid waste powder in the precursor suspension is 2:1 to 8:1, preferably 8: 1; the specific surface area of the solid phase is 200m 2 G to 230m 2 /g。
The invention utilizes alkaline industrial solid waste to modify the biochar to prepare the incineration fly ash heavy metal stabilizing agent, has low cost and simple process, and has better stabilizing effect on the incineration fly ash heavy metal. Meanwhile, a new solution is provided for resource utilization of the alkaline industrial solid waste and the biomass, and the method has good environmental and economic benefits.
The invention provides an application method of an incineration fly ash modified biochar chelating agent, which comprises the following steps:
and mixing the incineration fly ash modified biochar chelating agent with the incineration fly ash, adding crystal, fully stirring and then maintaining.
Wherein the mass ratio of the incineration fly ash modified biochar chelating agent to the incineration fly ash is 5-12%, the mass ratio of water to the incineration fly ash is 25-60%, the stirring time is 5-20 minutes, and the maintenance time is not less than 3 days.
The following are examples:
example 1
A preparation method of an incineration fly ash modified biochar chelating agent comprises the following steps:
(1) biomass pretreatment: drying the biomass in the air, drying to constant weight, and grinding into powder to obtain biomass powder; the biomass is rice straw. The specification of the biomass powder is 60 meshes.
(2) Ultrasonic liquid phase dispersion: uniformly dispersing the biomass powder obtained in the step (1) and alkaline industrial solid waste powder in a liquid phase to obtain a precursor suspension; the alkaline industrial solid waste is selected from Bayer process red mud, and the liquid phase is distilled water; the mass ratio of the alkaline industrial solid waste to the liquid phase is 1: 200; the mass ratio of the biomass to the alkaline industrial solid waste powder is 5: 1. The specific surface area of the solid phase is 220m 2 /g
Specifically, alkaline industrial solid waste powder was ultrasonically dispersed in a liquid phase to form a suspension, and then the biomass powder was added to the suspension and stirred for 5 hours.
(3) Carbonizing: roasting a solid phase obtained after solid-liquid separation is carried out on the precursor suspension liquid obtained in the step (2) in an oxygen-free environment until the biomass is carbonized to obtain a carbide; the carbonization temperature is 450 ℃, and the carbonization time is 4 hours.
(4) And (3) post-treatment: and (4) cleaning, drying and grinding the carbide obtained in the step (3) to obtain the incineration fly ash modified biochar chelating agent.
Specifically, the carbide obtained in the step (3) is washed by deionized water until salt separating particles in the leacheate are constant, and then the modified biochar is obtained by drying, grinding and sieving. Wherein the salt ion constancy can be calibrated by adopting the conductivity (measured by a conductivity meter), and the grinding mesh is 80 meshes.
The application method of the incineration fly ash modified biochar chelating agent prepared by the embodiment comprises the following steps:
and mixing the incineration fly ash modified biochar chelating agent with the incineration fly ash, adding crystal, fully stirring and then maintaining.
Wherein the mass ratio of the incineration fly ash modified biochar chelating agent to the incineration fly ash is 8%, the mass ratio of water to the incineration fly ash is 40%, the stirring time is 10 minutes, and the maintenance time is 3 days.
The solid waste leaching toxicity leaching method-acetic acid buffer solution method (HJ/T300-2007) respectively measures the heavy metal leaching toxicity of the incineration fly ash, and compares the measured value with the limit value specified in the domestic garbage landfill pollution control Standard (GB16889-2008), and the result shows that the concentration of the heavy metal leaching toxicity of the incineration fly ash after stabilization is lower than the limit value in GB 16889-2008.
Example 2
A preparation method of an incineration fly ash modified biochar chelating agent comprises the following steps:
(1) biomass pretreatment: drying the biomass in the air, drying to constant weight, and grinding into powder to obtain biomass powder; the biomass is bagasse. The specification of the biomass powder is 100 meshes.
(2) Ultrasonic liquid phase dispersion: uniformly dispersing the biomass powder obtained in the step (1) and alkaline industrial solid waste powder in a liquid phase to obtain a precursor suspension; the alkaline industrial solid waste is selected from ferrochrome slag, and the liquid phase is distilled water; the mass ratio of the alkaline industrial solid waste to the liquid phase is 1: 300; the mass ratio of the biomass to the alkaline industrial solid waste powder is 8: 1. The specific surface area of the solid phase is 230m 2 /g
Specifically, alkaline industrial solid waste powder was ultrasonically dispersed in a liquid phase to form a suspension, and then the biomass powder was added to the suspension and stirred for 8 hours.
(3) Carbonizing: roasting a solid phase obtained after solid-liquid separation is carried out on the precursor suspension obtained in the step (2) in an oxygen-free environment until the biomass is carbonized to obtain a carbonized substance; the carbonization temperature is 350 ℃, and the carbonization time is 3 hours.
(4) And (3) post-treatment: and (4) cleaning, drying and grinding the carbide obtained in the step (3) to obtain the incineration fly ash modified biochar chelating agent.
Specifically, the carbide obtained in the step (3) is washed by deionized water until salt separating particles in the leacheate are constant, and then the modified biochar is obtained by drying, grinding and sieving. Wherein the salt ion constancy can be calibrated by conductivity (measured by a conductivity meter), and the grinding mesh is 100 meshes.
The application method of the incineration fly ash modified biochar chelating agent prepared by the embodiment comprises the following steps:
and mixing the incineration fly ash modified biochar chelating agent with the incineration fly ash, adding crystal, fully stirring and then curing.
Wherein the mass ratio of the incineration fly ash modified biochar chelating agent to the incineration fly ash is 5%, the mass ratio of water to the incineration fly ash is 25%, the stirring time is 20 minutes, and the maintenance time is 3 days.
The solid waste leaching toxicity leaching method-acetic acid buffer solution method (HJ/T300-2007) respectively measures the heavy metal leaching toxicity of the incineration fly ash, and compares the measured value with the limit value specified in the domestic garbage landfill pollution control Standard (GB16889-2008), and the result shows that the concentration of the heavy metal leaching toxicity of the incineration fly ash after stabilization is lower than the limit value in GB 16889-2008.
Example 3
A preparation method of an incineration fly ash modified biochar chelating agent comprises the following steps:
(1) biomass pretreatment: drying the biomass in the air, drying to constant weight, and grinding into powder to obtain biomass powder; the biomass is cow dung. The specification of the biomass powder is 20 meshes.
(2) Ultrasonic liquid phase dispersion: uniformly dispersing the biomass powder obtained in the step (1) and alkaline industrial solid waste powder in a liquid phase to obtain a precursor suspension; the alkaline industrial solid waste is selected from sintering process red mud, and the liquid phase is distilled water; the mass ratio of the alkaline industrial solid waste to the liquid phase is 1: 300; the mass ratio of the biomass to the alkaline industrial solid waste powder is 2: 1. The specific surface area of the solid phase is 200m 2 /g
Specifically, alkaline industrial solid waste powder is ultrasonically dispersed in a liquid phase to form a suspension, and then the biomass powder is added to the suspension and stirred for 2 hours.
(3) Carbonizing: roasting a solid phase obtained after solid-liquid separation is carried out on the precursor suspension obtained in the step (2) in an oxygen-free environment until the biomass is carbonized to obtain a carbonized substance; the carbonization temperature is 600 ℃, and the carbonization time is 6 hours.
(4) And (3) post-treatment: and (4) cleaning, drying and grinding the carbide obtained in the step (3) to obtain the incineration fly ash modified biochar chelating agent.
Specifically, the carbide obtained in the step (3) is washed by deionized water until salt separating particles in the leacheate are constant, and then the modified biochar is obtained by drying, grinding and sieving. Wherein the salt ion constancy can be calibrated by adopting the conductivity (measured by a conductivity meter), and the grinding mesh is 60 meshes.
The application method of the incineration fly ash modified biochar chelating agent prepared by the embodiment comprises the following steps:
and mixing the incineration fly ash modified biochar chelating agent with incineration fly ash, adding water, fully stirring and then maintaining.
Wherein the mass ratio of the incineration fly ash modified biochar chelating agent to the incineration fly ash is 12%, the mass ratio of water to the incineration fly ash is 60%, the stirring time is 5 minutes, and the maintenance time is 3 days.
The solid waste leaching toxicity leaching method-acetic acid buffer solution method (HJ/T300-2007) respectively measures the heavy metal leaching toxicity of the incineration fly ash, and compares the measured value with the limit value specified in the domestic garbage landfill pollution control Standard (GB16889-2008), and the result shows that the concentration of the heavy metal leaching toxicity of the incineration fly ash after stabilization is lower than the limit value in GB 16889-2008.
Example 4
In this example, the modified biochar obtained in examples 1 to 3 was used to evaluate the stabilization effect of heavy metals in fly ash, which is the solidification effect of modified biochar chelating agent material on heavy metals in fly ash, and the method includes the following steps:
(1) the fly ash to be incinerated was obtained from a refuse incineration power plant of a certain province in Guangdong, and the leaching toxicity of the heavy metals from the fly ash is shown in Table 1.
(2) Incineration of fly ash: medicament: the mass ratio of water is 100:5:30, and medicaments comprising the modified biochar B1, B2 and B3 prepared in the examples 1 to 3 are added, stirred for 10 minutes respectively and then maintained for 3 days.
(3) After the maintenance is finished, the heavy metal leaching toxicity of the incineration fly ash is respectively measured according to a solid waste leaching toxicity leaching method-acetic acid buffer solution method (HJ/T300-2007), and the result is compared with the limit value specified in the domestic garbage landfill pollution control standard (GB16889-2008), and the result shows that the stabilized incineration fly ash heavy metal leaching toxicity concentration is lower than the limit value in GB 16889-2008.
TABLE 1 Effect of chelating agent in the present invention on the stabilization of incineration fly ash heavy metals
Note: "-" is not detected.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A preparation method of an incineration fly ash modified biochar chelating agent is characterized by comprising the following steps:
(1) biomass pretreatment: drying biomass in air, drying to constant weight, and grinding into powder to obtain biomass powder; the biomass comprises cellulose-derived biomass, the cellulose-derived biomass being plant residue;
(2) ultrasonic liquid phase dispersion: uniformly dispersing the biomass powder obtained in the step (1) and alkaline industrial solid waste powder in a liquid phase to obtain a precursor suspension; the alkaline industrial solid waste is selected from red mud, chromite slag, gold tailings or steel slag, and the liquid phase distilled water; the mass ratio of the alkaline industrial solid waste to the liquid phase is between 1:150 and 1: 300; the mass ratio of the biomass to the alkaline industrial solid waste powder is between 2:1 and 8: 1; the specific surface area of the biomass powder and the alkaline industrial solid waste powder in the step (2) is 200m 2 G to 230m 2 /g；
(3) Carbonizing: roasting a solid phase obtained after solid-liquid separation is carried out on the precursor suspension obtained in the step (2) in an oxygen-free environment until the biomass is carbonized to obtain a carbonized substance; the carbonization temperature of the step (3) is 350 ℃ to 450 ℃, and the carbonization time is 3 hours to 4 hours;
(4) and (3) post-treatment: and (4) cleaning, drying and grinding the carbide obtained in the step (3) to obtain the incineration fly ash modified biochar chelating agent.
2. The method for preparing the incineration fly ash modified biochar chelating agent according to claim 1, wherein the biomass powder in the step (1) is 20-100 meshes in specification.
3. The method for preparing the incineration fly ash modified biochar chelate according to claim 1, wherein the step (2) is specifically as follows:
ultrasonically dispersing alkaline industrial solid waste powder into a liquid phase to form a suspension, then adding the biomass powder into the suspension, and stirring for 2-8 hours.
4. The method for preparing the incineration fly ash modified biochar chelating agent according to claim 1, wherein the step (4) is specifically as follows:
and (4) washing the carbide obtained in the step (3) by using deionized water until salt separating molecules in the leacheate are constant, drying, grinding and sieving to obtain the modified biochar.
5. The method of claim 4, wherein the salt ion is constant and calibrated by conductivity, and the particle size of the grinding sieve is 60-100 mesh.
6. The method for using incineration fly ash modified biochar chelant prepared according to the method of any one of claims 1 to 5, comprising the steps of:
and mixing the incineration fly ash modified biochar chelating agent with the incineration fly ash, adding water, fully stirring and then maintaining.
7. The application method of claim 6, wherein the mass ratio of the incineration fly ash modified biochar chelating agent to the incineration fly ash is 5-12%, the mass ratio of water to the incineration fly ash is 25% -60%, the stirring time is 5-20 minutes, and the curing time is not less than 3 days.
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