CN112143501A - Stabilizing agent and stabilizing and repairing method for lead-polluted soil - Google Patents
Stabilizing agent and stabilizing and repairing method for lead-polluted soil Download PDFInfo
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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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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention relates to a stabilizing agent for lead-polluted soil and a stabilizing and repairing method for lead-polluted soil, which take waste red brick powder as a raw material, wherein the stabilizing agent comprises the following components in parts by weight: waste red brick powder: 18-22 parts; iron chloride: 1-5 parts; phosphate salt: 1-5 parts. The stabilizing agent can reduce Pb in soil to be treated from 2.13mg/L before treatment to 0.007mg/L, the stabilizing rate can reach 99.67%, the treatment time is not more than 10 days, the treatment time is short, the price of the used raw materials is low, and the repair cost is low.
Description
Technical Field
The invention belongs to the technical field of polluted soil treatment and restoration, and particularly relates to a lead-polluted soil stabilizing agent and a lead-polluted soil stabilizing and restoring method taking waste red brick powder as a raw material.
Background
Lead is an environmental heavy metal pollutant, is accumulated in human bodies, animals and plants, and has strong toxicity. With the acceleration of the industrialization process, the lead pollution of soil caused by artificial activities of the industrial and mining industry, the agriculture and the like seriously threatens the human health and the ecological environment.
At present, the lead polluted soil remediation method mainly comprises the technologies of physical remediation, chemical remediation, biological remediation and the like. Among them, the stabilization technique in chemical repair has become one of the main measures. The core of the stabilization repair technology lies in the selection of economic, effective and safe stabilization agents, common chemical stabilization agents are nano iron, biochar and the like, the cost is high in most cases, and the large-scale polluted soil repair engineering application is not facilitated.
The invention patent with publication number CN102965119B discloses a preparation method of a heavy metal contaminated soil stabilizer, which takes polyethyleneimine and magnesium compounds as raw materials, takes tetramethylammonium hydroxide as a carbon dioxide absorbent, uses various organic chemical materials, has good stabilizing effect, but has the problem of higher material cost.
The stabilizing material disclosed in patent publication No. CN 106825013A selects modified nano-iron and various organic polymers, has good stabilizing treatment effect, but has high price, high repair cost and higher risk of secondary pollution.
Therefore, a stabilizing agent having a good stabilizing effect and a low cost is demanded.
Disclosure of Invention
The invention provides a stabilizing agent for lead-polluted soil and a stabilizing and repairing method for lead-polluted soil, which take waste red brick powder as a raw material, and solve the technical problems of high price and high repairing cost of the raw material of the stabilizer used in the prior art on the premise of ensuring the treatment effect.
In a first aspect, the invention provides a lead-polluted soil stabilizing agent taking waste red brick powder as a raw material, which comprises the following components in parts by weight:
waste red brick powder: 18-22 parts;
iron chloride: 1-5 parts;
phosphate salt: 1-5 parts.
Further, the particle size of the waste red brick powder is2-110 mu m, and the specific surface area of the waste red brick powder is 350-400 m2/kg。
Further, in the waste red brick powder, Fe2O3Is 3-7% by mass, Al2O310-16% of SiO2The mass fraction of (A) is 50-60%.
Furthermore, in the ferric chloride, the mass fraction of impurities is less than 5%.
Further, the mass fraction of impurities in the phosphate is less than 5%.
In a second aspect, the embodiment of the invention also provides a method for stabilizing and repairing lead-contaminated soil, which is carried out by using the stabilizing agent, and the method comprises the following steps,
mixing ferric chloride with water to obtain an aqueous solution containing ferric chloride; the weight part of the ferric chloride is 1-5 parts;
mixing waste red brick powder, phosphate and soil to be treated to obtain first mixed polluted soil, wherein the waste red brick powder is 18-22 parts by weight, and the phosphate is 1-5 parts by weight;
and uniformly mixing the aqueous solution containing the ferric chloride and the first mixed contaminated soil, and performing stabilization treatment to obtain stabilized soil.
Further, the ratio of the mass of the soil to be treated to the mass sum of the waste red brick powder, the phosphate and the ferric chloride is 100: (1-10).
Further, the mass of the water is 15-23% of the mass of the soil to be treated.
Further, the stabilizing treatment time is 5-10 days.
Further, the grain size of the soil to be treated is less than or equal to 5 mm.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a stabilizing agent for lead-polluted soil and a stabilizing and repairing method for lead-polluted soil, wherein the stabilizing agent takes waste red brick powder as a raw material, and the stabilizing agent comprises waste red brick powder, ferric chloride and phosphate. The waste red brick powder isThe construction waste red brick is obtained by grinding the construction waste red brick, and the red brick is formed by firing a plurality of clay minerals at high temperature, so that the red brick powder has strong surface activity and adsorption performance and strong adsorption capacity on Pb, contains iron, aluminum oxide and silicate substances, and is difficult to migrate and convert by combining with Pb in soil through hydrolysis reaction, complexation reaction, precipitation reaction and the like in the reaction process. Phosphate radical in the phosphate can directly react with lead in the soil to form lead phosphate precipitate, and the lead phosphate precipitate and ferric chloride are subjected to synergistic reaction to finally form the lead phospho-chloride ore (Pb) through the processes of dissolution and precipitation5(PO4)3Cl) to stabilize the lead in the soil. According to the invention, through the synergistic relationship of the waste red brick powder, the ferric chloride and the phosphate, the Pb in the soil to be treated can be reduced to 0.007mg/L from 2.13mg/L before treatment, the stabilization rate can reach 99.67%, the treatment time does not exceed 10 days, the treatment time is short, the price of the used raw materials is low, and the repair cost is low.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
on one hand, the embodiment of the invention provides a lead-polluted soil stabilizing agent taking waste red brick powder as a raw material, and the stabilizing agent comprises the following components in parts by weight:
waste red brick powder: 18-22 parts;
iron chloride: 1-5 parts;
phosphate salt: 1-5 parts.
In the present invention, the effects of the components are as follows:
the red brick is formed by firing a plurality of clay minerals at high temperature, the waste red brick of the construction waste has strong surface activity after being subjected to grinding treatment, so that the waste red brick has strong ion exchange capacity and adsorption performance, has strong adsorption capacity on Pb in soil, contains iron, aluminum oxide and silicate substances, and is difficult to migrate and convert due to combination with Pb in the soil through hydrolysis reaction, complexation reaction, precipitation reaction and the like in the reaction process.
Phosphate radical in the phosphate can directly react with lead in the soil to form lead phosphate precipitate, and the lead phosphate precipitate and ferric chloride are subjected to synergistic reaction to finally form the lead phospho-chloride ore (Pb) through the processes of dissolution and precipitation5(PO4)3Cl) to stabilize the lead in the soil.
In the stabilizing agent proportion, the lead leaching concentration cannot reach the standard due to too few parts by weight of the waste red brick powder, the lead stabilizing rate is not obviously increased due to too many parts, and the cost is increased; similarly, the cost is also increased due to excessive parts by weight of ferric chloride and phosphate, and the cost is also increased due to too low parts by weight, so that the stabilizing reaction of heavy metal lead is limited, the reaction is incomplete, and the lead leaching concentration does not reach the standard.
In the embodiment of the present invention, the phosphate includes, but is not limited to, any one of the following: calcium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, calcium phosphate, potassium phosphate, and sodium phosphate. Preferably, monocalcium phosphate, which is a common phosphate fertilizer, can be selected for treating lead-contaminated soil, improving soil quality, changing the morphological distribution of heavy metal lead, and reacting with Pb to generate hydroxyl phosphorus lead ore (Pb)5(PO4)3OH)。
As an embodiment of the present invention, a method of making,the particle size of the waste red brick powder can be 2-110 mu m, and the specific surface area of the waste red brick powder can be 350-400 m2/kg。
The smaller the particle size of the waste red brick powder is, the larger the specific surface area of the waste red brick powder is, and the better the adsorption and ion exchange effects on lead in the lead-polluted soil are.
In one embodiment of the present invention, the waste red brick powder contains Fe2O3Can be 3-7% by mass, Al2O3The mass fraction of (A) may be 10-16%, SiO2The mass fraction of (b) may be 50 to 60%. Iron oxide, aluminum oxide and silicate in the waste red brick powder are beneficial to improving the lead adsorption and exchange capacity of the stabilizing agent, so that Pb in soil exists in a state of low solubility and low mobility.
In one embodiment of the present invention, the mass fraction of impurities in the ferric chloride is less than 5%.
In one embodiment of the present invention, the phosphate is less than 5% by mass of impurities.
In a second aspect, the embodiment of the invention provides a method for stabilizing and repairing lead-contaminated soil, which is carried out by using the stabilizing agent, and the method comprises the steps of,
s1, mixing ferric chloride with water to obtain an aqueous solution containing ferric chloride; the weight part of the ferric chloride is 1-5 parts;
the ferric chloride is a chemical substance which is very easy to absorb water, and in humid air, the ferric chloride absorbs water in the air to form blocks, so that the ferric chloride is dissolved in the water firstly, and is beneficial to being uniformly mixed with the soil to be treated. If the ferric chloride is mixed with the waste red brick powder, the phosphate and the soil to be treated at the same time, the raw materials are not uniformly mixed due to the characteristic that the ferric chloride is easy to form blocks, and the treatment effect is poor.
S2, mixing the waste red brick powder, phosphate and soil to be treated to obtain first mixed polluted soil, wherein the waste red brick powder is 18-22 parts by weight, and the phosphate is 1-5 parts by weight;
the dry waste red brick powder of the raw materials, the phosphate and the soil to be treated are mixed, which is beneficial to uniform mixing. The grain diameter of the soil to be treated is not more than 5mm, so that the stabilizing agent can be in full contact reaction with the soil.
And S3, uniformly mixing the aqueous solution containing the ferric chloride and the first mixed contaminated soil, and performing stable maintenance treatment to obtain the stabilized soil.
And the stabilizing treatment comprises covering the soil after uniformly mixing the water solution containing the ferric chloride and the first mixed contaminated soil by using tarpaulin, and sealing and maintaining.
As an embodiment of the present invention, a ratio of the mass of the soil to be treated to the sum of the mass of the waste red brick powder, the phosphate and the ferric chloride may be 100: (1-10).
The addition amount of the stabilizing agent is not more than 10 percent, no obvious compatibilization effect exists, repair caused by dilution is almost avoided, the stabilizing agent and the polluted soil are subjected to precipitation, hydrolysis, adsorption, complexation and other interactions to realize repair, and the stabilizing agent is suitable for repairing the lead polluted soil with the leaching concentration of less than or equal to 3mg/L, so that the lead polluted soil reaches the related standard of underground water. For the soil with serious lead pollution, the addition amount of the stabilizing agent can be increased for repairing.
In one embodiment of the invention, the mass of the water may be 15-23% of the mass of the soil to be treated.
In one embodiment of the present invention, the stabilizing time may be 5 to 10 days.
The following will explain in detail a lead-contaminated soil stabilizing agent and a lead-contaminated soil stabilizing and restoring method using waste red brick powder as a raw material according to the present invention, with reference to examples, comparative examples, and experimental data.
Example 1
Embodiment 1 provides a lead-contaminated soil stabilizing agent and a lead-contaminated soil stabilizing and remediating method using waste red brick powder as a raw material, wherein the contaminated soil is obtained from a certain ferrous metallurgy industrial site, and the concentration of lead ions in the treated leachate is 0.347 mg/L.
Preparing a stabilizer:
taking 10.0g of red brick powder, 0.5g of ferric chloride and 1.5g of monocalcium phosphate, uniformly spreading the red brick powder and the monocalcium phosphate on the surface of 300g of the polluted soil to be treated, and fully stirring and mixing to obtain first mixed polluted soil.
Dissolving ferric chloride in a proper amount of water, and fully and uniformly mixing and stirring the ferric chloride and the first mixed contaminated soil, wherein the mass of the water is 18% of that of the contaminated soil to be treated. Covering with preservative film and curing for 7 days. And then sampling and leaching, collecting the leaching solution and detecting the concentration of Pb.
The detection results of the leaching toxicity of lead in the soil before and after treatment are shown in Table 1, and the treated soil meets the requirement that the class III limit value is less than or equal to 0.01mg/L in the underground water environmental quality standard (GB/T14848-2017).
Example 2
The polluted soil is taken from a certain coking field, and is subjected to leaching treatment, and then leachate is collected, wherein the concentration of lead ions in the leachate is 0.068 mg/L.
Preparing a stabilizer:
2.73g of red brick powder, 0.13g of ferric chloride and 0.14g of monocalcium phosphate are taken, the red brick powder and the monocalcium phosphate are uniformly spread on the surface of 300g of the polluted soil to be treated, the mixture is fully stirred and mixed to obtain first mixed polluted soil, the ferric chloride is dissolved in a proper amount of water, and the mixture and the first mixed polluted soil are fully mixed and stirred uniformly, wherein the mass of the water is 15% of that of the polluted soil to be treated. Covering with preservative film and curing for 5 days. And then sampling and leaching, collecting the leaching solution and detecting the concentration of Pb.
The detection results of the leaching toxicity of lead in the soil before and after treatment are shown in Table 1, and the treated soil meets the requirement that the class III limit value is less than or equal to 0.01mg/L in the underground water environmental quality standard (GB/T14848-2017).
Example 3
The polluted soil is taken from a certain ferrous metallurgy polluted site, and the leachate is collected after leaching treatment, wherein the concentration of lead ions in the leachate is 2.13 mg/L.
Preparing a stabilizer: and (3) taking 20g of red brick powder, 5g of ferric chloride and 5g of sodium dihydrogen phosphate, and fully and uniformly mixing. Uniformly spreading red brick powder and monocalcium phosphate on the surface of 300g of the to-be-treated polluted soil, fully stirring and mixing to obtain first mixed polluted soil, dissolving ferric chloride in a proper amount of water, and fully mixing and stirring the ferric chloride and the first mixed polluted soil uniformly, wherein the mass of the water is 20% of that of the to-be-treated polluted soil. Covering with preservative film and curing for 10 days. And then sampling and leaching, collecting the leaching solution and detecting the concentration of Pb.
The detection results of the leaching toxicity of lead in the soil before and after treatment are shown in Table 1, and the treated soil meets the requirement that the class III limit value is less than or equal to 0.01mg/L in the underground water environmental quality standard (GB/T14848-2017).
Example 4
The polluted soil is taken from a certain coking pollution site, and leachate is collected after leaching treatment, wherein the concentration of lead ions in the leachate is 0.593 mg/L.
Preparing a stabilizer: taking 15g of red brick powder, 0.75g of ferric chloride and 2.25g of monopotassium phosphate, and fully and uniformly mixing. Uniformly spreading red brick powder and monocalcium phosphate on the surface of 300g of the polluted soil to be treated, and fully stirring and mixing to obtain first mixed polluted soil. Dissolving ferric chloride in a proper amount of water, and fully and uniformly mixing and stirring the ferric chloride and the first mixed contaminated soil, wherein the mass of the water is 20% of that of the contaminated soil to be treated. Covering with preservative film and curing for 8 days. And then sampling and leaching, collecting the leaching solution and detecting the concentration of Pb.
The detection results of the leaching toxicity of lead in the soil before and after treatment are shown in Table 1, and the treated soil meets the requirement that the class III limit value is less than or equal to 0.01mg/L in the underground water environmental quality standard (GB/T14848-2017).
Comparative example 1
Comparative example 1 referring to example 4, the difference from example 4 is that the mass of the waste red brick dust is 27g, and the results of the test of leaching toxicity of lead in the soil before and after the treatment are shown in table 1.
Comparative example 2
Comparative example 2 referring to example 4, the difference from example 4 is that the mass of the waste red brick powder is 3g, and the results of the test of the leaching toxicity of lead in the soil before and after the treatment are shown in table 1.
Comparative example 3
Comparative example 3 provides a contaminated soil stabilizing agent, taking 10g of polyethyleneimine, wherein the weight ratio of polyethyleneimine, magnesium oxide, tetramethylammonium hydroxide and ferrous sulfate is 1: 0.2: 0.1: 0.4; preparing a stabilizer, and preparing a stabilizer solution with the mass fraction of 20% for later use. 40g of lead contaminated soil is taken, 40mL of stabilizer solution is added, the mixture is stirred by a glass rod for 2min and is uniformly mixed, the maintenance is carried out for 24h, a leaching method in GB5086 'solid waste leaching toxicity leaching method' is adopted for carrying out a leaching test, and the experimental result is shown in Table 1.
TABLE 1
The leaching treatment and the detection of the Pb concentration of the leachate of the contaminated soil and the treated soil obtained in the embodiments 1 to 4 and the comparative examples 1 to 3 of the invention are carried out by the following methods:
leaching treatment: leaching by adopting a method specified in a solid waste leaching toxicity method sulfuric acid-nitric acid method (HJ 299-2007), and specifically comprises the following steps: adding a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a mass ratio of 2:1 into distilled water (1L of mixed solution of 2 drops of water) to enable the pH value to be 3.20 +/-0.05, calculating the volume of a required leaching agent according to a liquid-solid ratio of 10:1(L/kg) for 150 plus-soil and 200g of polluted soil, adding the leaching agent, covering a bottle cap, fixing the bottle cap on a turnover type oscillation device, adjusting the rotation speed to be 30 +/-2 r/min, and oscillating the bottle cap at 23 +/-2 ℃ for 18 +/-2 h. When gas is generated during the shaking process, the extraction bottle is opened in the fume hood at regular time to release excessive pressure. Loading a filter membrane on a pressure filter, leaching the filter and the filter membrane by using dilute nitric acid, discarding leacheate, filtering and collecting leachate.
And (3) detecting the Pb concentration of the leachate: the content of lead ions in the leachate is analyzed by a method in appendix A (GB 5085.3-2007) for identifying leaching toxicity of hazardous waste identification standards, and the concentration of Pb is detected.
In table 1, the calculation formula of the Pb stabilization rate is:
wherein η is the stabilization efficiency (%); c0The concentration (mg.L) of Pb ions in the leachate of the polluted soil to be treated-1)；CSFor stabilizing the concentration (mg. L) of Pb ions in the soil leachate-1)。
Generally, the higher the stabilization rate of Pb, the better the surface soil stabilization restoration effect.
In Table 1, data analysis of examples 1-4 to comparative examples 1-3:
the soil treated in the embodiments 1 to 4 is subjected to leaching treatment, and the leachate is collected, and the concentration of Pb in the leachate is detected to be 0.001-0.0092 mg/L by the method, wherein the stabilization rate is 97.34-99.67%, the stabilization rate is high, the stabilization treatment time is 5-10 days, and the treatment time is short. In comparative example 2, the added weight part of the waste red brick powder is too small, the stabilizing rate is 57.84%, and the stabilizing treatment time is 8 h. The stabilizing rate after the treatment in the comparative example 3 is 86%, the stabilizing treatment time is 24h, the cost of the used raw materials is high, the stabilizing treatment rate is low, the stabilizing treatment time is long, and the concentration after the treatment is high, which can only reach the pollution control standard for hazardous waste landfill (GB 18598-2001).
From the above embodiments, the stabilizer provided by the invention is suitable for the field soil polluted by heavy metal lead, has a good repairing effect, can meet the requirement of class III limit in the Standard for environmental quality of underground Water (GB/T14848-2017), has a small addition amount of the medicament, is within 10% of the soil quality, has a short repairing period and low raw material cost, and is simple and easy to operate in preparation and use methods.
The stabilizing agent for the lead-polluted soil provided by the invention takes the construction waste red bricks as a base material, and is supplemented with ferric chloride and phosphate after being subjected to grinding treatment, wherein the phosphate and ferric chloride can react with heavy metals through precipitation, hydrolysis and the like to stabilize the heavy metals, the waste red brick powder can adsorb, complex, precipitate and the like to fix the heavy metal lead in the polluted soil, the three substances play a role in synergy, the Pb in a soil leachate to be treated can be reduced to 0.007mg/L from 2.13mg/L before treatment, the stabilizing rate of the heavy metals can reach 99.67%, the treatment time does not exceed 10 days, the treatment time is short, the price of the used raw materials is low, and the repair cost is low.
Compared with the prior art, the stabilizing agent disclosed by the invention has the following advantages:
(1) the red brick powder contains various iron oxides, aluminum oxides, silicates and the like, and the red brick is formed by firing clay minerals, has extremely strong surface adsorption and ion exchange capacities, and can effectively stabilize unstable lead in site-polluted soil. Calcium dihydrogen phosphate is a common phosphate fertilizer, and can improve soil quality and change the shape distribution of heavy metal Pb after being added into soil, and reacts with Pb to generate hydroxyl phosphorus lead ore (Pb)5(PO4)3OH). With the presence of Pb in the soil2+By a dissolution-precipitation process with H2PO4 -And Cl-Combined to form the chlorophosphorite (Pb)5(PO4)3Cl) to stabilize the lead in the soil.
(2) The application range of the agent is wide, and the agent can be suitable for lead polluted soil with different concentrations (0.068-2.13 mg/L) by adjusting the proportion, the addition amount and the water content of each component.
(3) The medicament has the advantages of wide raw material source, low cost, simple preparation method, convenient operation, short repair period and good effect.
(4) The material is easy to obtain and low in cost when being used as a stabilizing material for treating heavy metal lead polluted soil, can well utilize the waste red bricks of the construction waste, is an economic, efficient and environment-friendly heavy metal stabilizing and repairing material, and the treated soil has no secondary pollution.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The stabilizing agent for the lead-polluted soil by taking waste red brick powder as a raw material is characterized by comprising the following components in parts by weight:
waste red brick powder: 18-22 parts;
iron chloride: 1-5 parts;
phosphate salt: 1-5 parts.
2. The agent for stabilizing lead-contaminated soil using waste red brick powder as raw material according to claim 1, wherein the particle size of the waste red brick powder is 2 to 110 μm, and the specific surface area of the waste red brick powder is 350 to 400m2/kg。
3. The agent for stabilizing lead-contaminated soil using waste red brick powder as raw material as claimed in claim 1, wherein Fe is contained in the waste red brick powder2O3Is 3-7% by mass, Al2O310-16% of SiO2The mass fraction of (A) is 50-60%.
4. The agent for stabilizing lead-contaminated soil using waste red brick powder as a raw material according to claim 1, wherein the iron chloride contains impurities in a mass fraction of < 5%.
5. The agent for stabilizing lead-contaminated soil using waste red brick powder as a raw material according to claim 1, wherein the mass fraction of impurities in the phosphate is less than 5%.
6. A method for stabilizing and remediating lead-contaminated soil by using the stabilizing agent according to any one of claims 1 to 5, which comprises,
mixing ferric chloride with water to obtain an aqueous solution containing ferric chloride; the weight part of the ferric chloride is 1-5 parts;
mixing waste red brick powder, phosphate and soil to be treated to obtain first mixed polluted soil, wherein the waste red brick powder is 18-22 parts by weight, and the phosphate is 1-5 parts by weight;
and uniformly mixing the aqueous solution containing the ferric chloride and the first mixed contaminated soil, and performing stabilization treatment to obtain stabilized soil.
7. The method for stabilizing and remediating lead-contaminated soil according to claim 6, wherein the ratio of the mass of the soil to be treated to the sum of the mass of the waste red brick powder, the mass of phosphate and the mass of the iron chloride is 100: (1-10).
8. The method for stabilizing and restoring lead-contaminated soil according to claim 7, wherein the mass of the water is 15-23% of the mass of the soil to be treated.
9. The method for stabilizing and remediating lead-contaminated soil according to claim 7, wherein the stabilizing treatment time is 5-10 days.
10. The method for stabilizing and remediating lead-contaminated soil according to claim 7, wherein the particle size of the soil to be treated is less than or equal to 5 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985444A (en) * | 2022-05-26 | 2022-09-02 | 重庆汇亚环保工程有限公司 | Stabilized remediation of lead-contaminated soil |
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