CN113969174A - Soil heavy metal pollution repairing agent and preparation method and use method thereof - Google Patents
Soil heavy metal pollution repairing agent and preparation method and use method thereof Download PDFInfo
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- CN113969174A CN113969174A CN202010713827.2A CN202010713827A CN113969174A CN 113969174 A CN113969174 A CN 113969174A CN 202010713827 A CN202010713827 A CN 202010713827A CN 113969174 A CN113969174 A CN 113969174A
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the technical field of soil remediation, and discloses a soil heavy metal pollution remediation agent, and a preparation method and a use method thereof. The soil heavy metal pollution remediation agent comprises a heavy metal adsorbent, coated magnetic particles and an outer coating. By utilizing the soil heavy metal pollution remediation agent comprising the heavy metal adsorbent, the coated magnetic particles and the outer coating, the heavy metal pollution remediation agent can effectively adsorb heavy metals such as lead, cadmium, nickel, mercury, copper and the like in soil, can be easily separated from the soil, is simple to operate and low in implementation difficulty, and effectively realizes remediation of the heavy metal pollution of the soil. After the soil heavy metal pollution repairing agent is adsorbed in soil for a period of time, the soil heavy metal pollution repairing agent adsorbed with heavy metal pollutants can be easily separated from the soil through ploughing and magnetic adsorption, so that the subsequent sealing or treatment is facilitated, and secondary pollution is avoided.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a soil heavy metal pollution remediation agent and a preparation method and a use method thereof.
Background
With the mining, processing and application of human beings to the mining industry, heavy metals gradually diffuse into the surrounding environments such as soil, water and the like, and become one of the important factors threatening the health of plants, animals and human beings.
The ministry of environmental protection and the ministry of national soil resources jointly release a national soil pollution condition survey bulletin, 16.1% of national soil survey points are polluted, namely, the polluted soil accounts for 1/6 of all sampled soils. Wherein the pollution proportion of the farmland part is up to more than 19.4 percent, namely the polluted farmland accounts for 1/5 of the whole sampled farmland.
With the situation of heavy metal pollution of soil becoming more and more serious, the technology for remedying the heavy metal pollution of the soil is also more and more emphasized.
Disclosure of Invention
Technical problem to be solved
In view of the above, the main object of the present invention is to provide a soil heavy metal pollution remediation agent, a preparation method thereof and a use method thereof, so as to achieve remediation of soil heavy metal pollution.
(II) technical scheme
In order to achieve the above object, the present invention provides a soil heavy metal pollution remediation agent, comprising: the heavy metal adsorbent is used for adsorbing heavy metal pollutants in soil; the coated magnetic particles are used for enabling the soil heavy metal pollution remediation agent to be easily separated from soil; and the outer coating is used for coating the heavy metal adsorbent and the coated magnetic particles.
In one embodiment of the invention, the heavy metal adsorbent comprises phosphate rock powder, pyrite powder and biochar which are mixed according to a mass ratio of 5-8: 1-3: 1-2, wherein the average particle size of the phosphate rock powder and the average particle size of the pyrite powder are both less than or equal to 8 microns, and the average particle size of the biochar is 60-80 meshes.
In one embodiment of the invention, the biochar is replaced by cation exchange resin or humic acid, and the average particle size of the cation exchange resin or humic acid is 60-80 meshes.
In one embodiment of the invention, the particle size of the heavy metal adsorbent is 0.5-2 mm.
In one embodiment of the present invention, the coated magnetic particle includes: grinding to remove edges and corners, and then grinding to obtain iron powder or ferrite magnetic materials with the diameter of 1-4 mm; and a resin film coated on the iron powder or ferrite magnetic material.
In one embodiment of the invention, the outer wrapping film is a resin film with micropores, and the diameter of each micropore is 0.1-0.25 mm.
In one embodiment of the invention, the soil heavy metal pollution remediation agent is round or rod-shaped, the diameter is 5-10 mm, and the length is 10-30 mm.
In order to achieve the aim, the invention also provides a preparation method of the soil heavy metal pollution repairing agent, which comprises the following steps: grinding and mixing the ground phosphate rock, the pyrite and the biochar, and adding water to prepare a heavy metal adsorbent; grinding iron powder or ferrite magnetic materials to remove edges and corners, and coating the edges and corners with a resin film to prepare coated magnetic particles; and (3) coating the heavy metal adsorbent and the coated magnetic particles by using a microporous resin film as an outer coating to obtain the granular soil heavy metal pollution remediation agent.
In one embodiment of the present invention, the step of forming the heavy metal adsorbent comprises: grinding the phosphate rock powder and the pyrite until the average particle size is less than or equal to 8 mu m; grinding the biochar to an average particle size of 60-80 meshes; and mixing the ground phosphate rock powder, the pyrite and the biochar according to the mass ratio of 5-8: 1-3: 1-2, and adding 30% of water to prepare the heavy metal adsorbent with the particle size of 0.5-2 mm.
In one embodiment of the invention, the biochar is replaced by cation exchange resin or humic acid, and the average particle size of the cation exchange resin or humic acid is 60-80 meshes.
In one embodiment of the present invention, the step of forming the coated magnetic particles comprises: grinding iron powder or ferrite magnetic material with the diameter of 1-4 mm to remove sharp edges and corners; and coating the iron powder or ferrite magnetic material with the diameter of 1-4 mm by adopting a resin film to obtain coated magnetic particles.
In one embodiment of the present invention, the step of coating the heavy metal adsorbent and the coated magnetic particles with a resin film having micropores as an outer coating film comprises: uniformly mixing the coated magnetic particles and the heavy metal adsorbent according to the mass ratio of 1-3: 9-7, extruding the mixture into a cylinder with the diameter of 5mm and the length of 20mm, and drying the cylinder at a low temperature of 50-70 ℃ until the water content is less than or equal to 10%; and (3) adopting a resin film with the diameter of a micropore of 0.1-0.25 mm as an outer wrapping film, and wrapping the column body with the diameter of 5mm and the length of 20mm to obtain the granular soil heavy metal pollution repairing agent.
In order to achieve the purpose, the invention also provides a using method of the soil heavy metal pollution repairing agent, which comprises the following steps: the soil heavy metal pollution remediation agent is scattered into soil and raked or raked into the soil; heavy metal pollutants in the soil enter the soil solution through exchange, and are adsorbed to the soil heavy metal pollution remediation agent; after the soil heavy metal pollution repairing agent is adsorbed in soil, the soil heavy metal pollution repairing agent with the adsorbed heavy metal pollutants is taken out of the soil through turning and magnetic adsorption, and is sealed and stored or treated.
(III) advantageous effects
According to the technical scheme, the invention has the following beneficial effects:
1. according to the soil heavy metal pollution restoration agent, the preparation method and the use method thereof, the soil heavy metal pollution restoration agent comprising the heavy metal adsorbent, the coated magnetic particles and the outer coating can effectively adsorb heavy metals such as lead, cadmium, nickel, mercury, copper and the like in soil, and can be easily separated from the soil, so that the operation is simple, the implementation difficulty is low, and the restoration of the soil heavy metal pollution is effectively realized.
2. According to the soil heavy metal pollution remediation agent and the preparation method and the using method thereof, after the soil heavy metal pollution remediation agent is adsorbed in soil for a period of time, the soil heavy metal pollution remediation agent adsorbed with heavy metal pollutants can be easily separated from the soil through turning and magnetic adsorption, so that the subsequent sealing or treatment is facilitated, and secondary pollution is avoided.
Drawings
FIG. 1 is a schematic diagram of a soil heavy metal pollution remediation agent according to an embodiment of the present invention.
FIG. 2 is a flow chart of a preparation method of the soil heavy metal pollution remediation agent according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
At present, soil heavy metal restoration methods mainly adopt a soil leaching method, a bioremediation method, soil in-situ fixation restoration and other methods, but all have the problems of subsequent treatment and the like, and the application and popularization of the soil heavy metal restoration methods are influenced.
For example, in the case of soil leaching, the heavy metals in the soil are leached out by a leaching agent. The heavy metals in the soil are usually dissolved in a solution state by using water and a chemical leaching agent, and the solution is discharged out of the soil body. And the heavy metal content of the soil is reduced by repeatedly washing. The soil leaching method has the defects that the subsequent treatment of the leaching solution has more problems and great difficulty; if the cleaning liquid is directly discharged, secondary pollution is easily caused; if the concentrate is evaporated to dryness, the workload is large, and the operation is difficult in reality.
For the bioremediation method, the bioremediation method for heavy metal pollution is a method for reducing the heavy metal content in soil by planting plants with strong heavy metal adsorption capacity on the polluted soil and adsorbing heavy metals in the soil through the plants. The bioremediation method has long working period, and the plants absorb heavy metal and are difficult to treat, so that a special incineration treatment device is needed, and the practical implementation difficulty is high.
The soil in-situ fixation restoration method is to utilize the precipitator to precipitate the heavy metals in the soil, reduce the activity of the heavy metals in the soil and reduce the absorption of the heavy metals by crops. The in-situ soil fixation and restoration only reduces the absorption of plants to heavy metals, but does not reduce the content of the heavy metals in the soil, and the heavy metals always have hidden troubles in the soil.
In order to overcome the defects in the prior art, the invention provides the soil heavy metal pollution restoration agent and the preparation method and the use method thereof.
As shown in fig. 1, fig. 1 is a schematic diagram of a soil heavy metal pollution remediation agent according to an embodiment of the present invention, the soil heavy metal pollution remediation agent includes a heavy metal adsorbent 1, coated magnetic particles 2 and an outer coating 3, wherein the heavy metal adsorbent 1 is used for adsorbing heavy metal pollutants in soil, the coated magnetic particles 2 are used for facilitating separation of the soil heavy metal pollution remediation agent from the soil, and the outer coating 3 is used for coating the heavy metal adsorbent and the coated magnetic particles. The soil heavy metal pollution remediation agent can be generally round or rod-shaped, the diameter is 5-10 mm, and the length is 10-30 mm.
In one embodiment of the invention, the heavy metal adsorbent 1 has a particle size of 0.5-2 mm, and comprises powdered rock phosphate, pyrite powder and biochar which are mixed according to a mass ratio of 5-8: 1-3: 1-2, wherein the powdered rock phosphate and pyrite powder are ultrafine particles, and the average particle size of the powdered rock phosphate and pyrite powder is less than or equal to 8 microns; the biochar is of common fineness, and the average particle size is 60-80 meshes. The biochar can be replaced by cation exchange resin or humic acid, the cation exchange resin or humic acid also has common fineness, and the average particle size is 60-80 meshes.
In one embodiment of the present invention, the coated magnetic particle 2 includes: the grinding and chamfering device comprises iron powder or ferrite magnetic materials with the diameter of 1-4 mm after edges and corners are removed, and a resin film coated on the iron powder or ferrite magnetic materials, wherein the resin film is used for preventing the iron powder or ferrite magnetic materials from being corroded to lose magnetism.
In one embodiment of the present invention, the outer film 3 is a resin film having micropores with a diameter of 0.1 to 0.25 mm.
Based on the schematic diagram of the soil heavy metal pollution remediation agent shown in fig. 1 according to the embodiment of the invention, fig. 2 shows a flow chart of a preparation method of the soil heavy metal pollution remediation agent according to the embodiment of the invention, and the method comprises the following steps:
step S1: grinding and mixing the ground phosphate rock, the pyrite and the biochar, and adding water to prepare a heavy metal adsorbent;
in this step, the step of preparing the heavy metal adsorbent specifically includes: grinding the phosphate rock powder and the pyrite to ultrafine particles, wherein the average particle size is less than or equal to 8 mu m; grinding the biochar to common fineness, namely average particle size is 60-80 meshes; and mixing the ground phosphate rock powder, the pyrite and the biochar according to the mass ratio of 5-8: 1-3: 1-2, and adding 30% of water to prepare the heavy metal adsorbent with the particle size of 0.5-2 mm.
The biochar can be replaced by cation exchange resin or humic acid, the cation exchange resin or humic acid also has common fineness, and the average particle size is 60-80 meshes.
Step S2: grinding iron powder or ferrite magnetic materials to remove edges and corners, and coating the edges and corners with a resin film to prepare coated magnetic particles;
in this step, the step of producing coated magnetic particles specifically includes: grinding iron powder or ferrite magnetic material with the diameter of 1-4 mm to remove sharp edges and corners; and coating the iron powder or ferrite magnetic material with the diameter of 1-4 mm by adopting a resin film to obtain coated magnetic particles. Among them, the resin film is used to prevent iron powder or ferrite magnetic material from being corroded to lose magnetism.
Step S3: coating the heavy metal adsorbent and the coated magnetic particles by using a resin film with micropores as an outer coating to obtain a granular soil heavy metal pollution remediation agent;
in this step, the step of coating the heavy metal adsorbent and the coated magnetic particles with a resin film having micropores as an outer coating film specifically includes: uniformly mixing the coated magnetic particles and the heavy metal adsorbent according to the mass ratio of 1-3: 9-7, extruding the mixture into a cylinder with the diameter of 5mm and the length of 20mm, and drying the cylinder at a low temperature of 50-70 ℃ until the water content is less than or equal to 10%; and (3) adopting a resin film with the diameter of a micropore of 0.1-0.25 mm as an outer wrapping film, and wrapping the column body with the diameter of 5mm and the length of 20mm to obtain the granular soil heavy metal pollution repairing agent.
The soil heavy metal pollution remediation agent can be generally round or rod-shaped, the diameter is 5-10 mm, and the length is 10-30 mm.
In the embodiment of preparing the soil heavy metal pollution remediation agent shown in fig. 2, the heavy metal adsorbent is prepared, the coated magnetic particles are prepared, and then the prepared heavy metal adsorbent and the coated magnetic particles are coated by using a microporous resin film as an outer coating film, so that the granular soil heavy metal pollution remediation agent is obtained. In practical application, the coated magnetic particles can be prepared first, then the heavy metal adsorbent is prepared, and then the prepared coated magnetic particles and the prepared heavy metal adsorbent are coated by adopting a microporous resin film as an outer coating, so that the granular soil heavy metal pollution remediation agent can be obtained, and details are not repeated here.
Based on the preparation method of the soil heavy metal pollution remediation agent shown in fig. 2, the embodiment of the invention also provides a use method of the soil heavy metal pollution remediation agent, and the method comprises the following steps: the soil heavy metal pollution remediation agent is scattered into soil and raked or raked into the soil; heavy metal pollutants in the soil enter the soil solution through exchange, and are adsorbed to the soil heavy metal pollution remediation agent; after the soil heavy metal pollution repairing agent is adsorbed in soil, the soil heavy metal pollution repairing agent with the adsorbed heavy metal pollutants is taken out of the soil through turning and magnetic adsorption, and is sealed and stored or treated.
Example 1: a use method of a soil heavy metal pollution remediation agent specifically comprises the following steps:
step 1: preparing a heavy metal adsorbent, specifically grinding ground phosphate rock and pyrite until the average particle sizes are less than or equal to 8 mu m, and grinding biochar (or cation exchange resin and humic acid) until the average particle size is 60-80 meshes; then mixing ground phosphate rock powder, pyrite and biochar (or cation exchange resin and humic acid) according to the mass ratio of 7: 1.5, adding 30% of water to prepare a heavy metal adsorbent with the particle size of 0.5-2 mm;
step 2: preparing coated magnetic particles, specifically grinding an iron powder or ferrite magnetic material with the diameter of 1-4 mm to remove sharp edges and corners, and coating the iron powder or ferrite magnetic material with the diameter of 1-4 mm with a resin film to obtain the coated magnetic particles;
and step 3: preparing a cylinder containing coated magnetic particles and a heavy metal adsorbent, wherein the coated magnetic particles and the heavy metal adsorbent are mixed according to the ratio of 1-3: uniformly mixing 9-7 mass ratio, extruding into a cylinder with the diameter of 5mm and the length of 20mm, and drying at low temperature (50-70 ℃) until the water content is less than or equal to 10%;
and 4, step 4: and (3) wrapping the column body with the diameter of 5mm and the length of 20mm by using a resin film with micropores as an outer wrapping film to obtain the granular soil heavy metal pollution repairing agent, wherein the diameter of the micropores of the resin film is 0.1-0.25 mm. The soil heavy metal pollution remediation agent can be generally round or rod-shaped, the diameter is 5-10 mm, and the length is 10-30 mm.
And 5: the prepared soil heavy metal pollution remediation agent is scattered into the ploughed soil, and the soil is harrowed or raked into the soil, and is applied with fertilizer, so that the heavy metal in the soil is exchanged into the soil solution and is adsorbed to the soil heavy metal pollution remediation agent. After the soil heavy metal pollution repairing agent is adsorbed in the soil for a period of time, the soil heavy metal pollution repairing agent with the adsorbed heavy metals is taken out of the soil through turning and magnetic adsorption, and is sealed or treated.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A soil heavy metal pollution remediation agent, comprising:
the heavy metal adsorbent is used for adsorbing heavy metal pollutants in soil;
the coated magnetic particles are used for enabling the soil heavy metal pollution remediation agent to be easily separated from soil;
and the outer coating is used for coating the heavy metal adsorbent and the coated magnetic particles.
2. The soil heavy metal pollution remediation agent of claim 1, wherein the heavy metal adsorbent comprises ground phosphate rock, pyrite powder and biochar which are mixed according to a mass ratio of 5-8: 1-3: 1-2, wherein the average particle size of the ground phosphate rock and the average particle size of the pyrite powder are both less than or equal to 8 μm, and the average particle size of the biochar is 60-80 meshes.
3. The soil heavy metal pollution remediation agent of claim 2, wherein the biochar is replaced by cation exchange resin or humic acid, and the average particle size of the cation exchange resin or humic acid is 60-80 meshes.
4. The soil heavy metal pollution remediation agent of claim 2, wherein the particle size of the heavy metal adsorbent is 0.5-2 mm.
5. The soil heavy metal pollution remediation agent of claim 1, wherein the coated magnetic particles comprise:
grinding to remove edges and corners, and then grinding to obtain iron powder or ferrite magnetic materials with the diameter of 1-4 mm; and
a resin film coated on the iron powder or ferrite magnetic material.
6. The soil heavy metal pollution remediation agent of claim 1, wherein the outer coating is a resin film having micropores, and the diameter of the micropores is 0.1-0.25 mm.
7. The soil heavy metal pollution remediation agent of claim 1, wherein the soil heavy metal pollution remediation agent is round or rod-shaped, and has a diameter of 5-10 mm and a length of 10-30 mm.
8. The preparation method of the soil heavy metal pollution remediation agent of any one of claims 1 to 7, comprising:
grinding and mixing the ground phosphate rock, the pyrite and the biochar, and adding water to prepare a heavy metal adsorbent;
grinding iron powder or ferrite magnetic materials to remove edges and corners, and coating the edges and corners with a resin film to prepare coated magnetic particles;
and (3) coating the heavy metal adsorbent and the coated magnetic particles by using a microporous resin film as an outer coating to obtain the granular soil heavy metal pollution remediation agent.
9. The method for preparing the soil heavy metal pollution remediation agent of claim 8, wherein the step of preparing the heavy metal adsorbent comprises:
grinding the phosphate rock powder and the pyrite until the average particle size is less than or equal to 8 mu m;
grinding the biochar to an average particle size of 60-80 meshes; and
mixing the ground phosphate rock powder, pyrite and biochar according to the mass ratio of 5-8: 1-3: 1-2, and adding 30% of water to prepare the heavy metal adsorbent with the particle size of 0.5-2 mm.
10. The preparation method of the soil heavy metal pollution remediation agent of claim 9, wherein the biochar is replaced by cation exchange resin or humic acid, and the average particle size of the cation exchange resin or humic acid is 60-80 meshes.
11. The method for preparing the soil heavy metal pollution remediation agent of claim 8, wherein the step of preparing the coated magnetic particles comprises:
grinding iron powder or ferrite magnetic material with the diameter of 1-4 mm to remove sharp edges and corners; and
and coating the iron powder or ferrite magnetic material with the diameter of 1-4 mm by using a resin film to obtain coated magnetic particles.
12. The method for preparing a soil heavy metal pollution remediation agent according to claim 8, wherein the step of coating the heavy metal adsorbent and the coated magnetic particles with a microporous resin film as an outer coating comprises:
uniformly mixing the coated magnetic particles and the heavy metal adsorbent according to the mass ratio of 1-3: 9-7, extruding the mixture into a cylinder with the diameter of 5mm and the length of 20mm, and drying the cylinder at a low temperature of 50-70 ℃ until the water content is less than or equal to 10%;
and (3) adopting a resin film with the diameter of a micropore of 0.1-0.25 mm as an outer wrapping film, and wrapping the column body with the diameter of 5mm and the length of 20mm to obtain the granular soil heavy metal pollution repairing agent.
13. The use method of the soil heavy metal pollution remediation agent of any one of claims 1 to 7, comprising:
the soil heavy metal pollution remediation agent is scattered into soil and raked or raked into the soil;
heavy metal pollutants in the soil enter the soil solution through exchange, and are adsorbed to the soil heavy metal pollution remediation agent;
after the soil heavy metal pollution repairing agent is adsorbed in soil, the soil heavy metal pollution repairing agent with the adsorbed heavy metal pollutants is taken out of the soil through turning and magnetic adsorption, and is sealed and stored or treated.
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| CN202211177943.2A CN115678566A (en) | 2020-07-22 | 2020-07-22 | Soil heavy metal pollution remediation agent and preparation method and use method thereof |
| CN202010713827.2A CN113969174A (en) | 2020-07-22 | 2020-07-22 | Soil heavy metal pollution repairing agent and preparation method and use method thereof |
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Cited By (1)
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| CN115678566A (en) | 2023-02-03 |
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