CN111205872A - Lead-polluted soil stabilization composite reagent and use method thereof - Google Patents
Lead-polluted soil stabilization composite reagent and use method thereof Download PDFInfo
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- CN111205872A CN111205872A CN202010049510.3A CN202010049510A CN111205872A CN 111205872 A CN111205872 A CN 111205872A CN 202010049510 A CN202010049510 A CN 202010049510A CN 111205872 A CN111205872 A CN 111205872A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/04—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only applied in a physical form other than a solution or a grout, e.g. as granules or gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention relates to a lead-polluted soil stabilization composite reagent and a use method thereof, belonging to the technical field of heavy metal-polluted soil remediation. The composite medicament comprises, by mass, 35-90% of acid-activated blast furnace slag and 10-65% of phosphate source, wherein the phosphorus content in the phosphate source is more than 5 wt%. By reasonably controlling the using amounts of the acid activated blast furnace slag and the phosphate radical source, the acid activated blast furnace slag replaces part of the phosphate radical source to stabilize the lead in the polluted soil, the synergistic effect between the acid activated blast furnace slag and the phosphate radical source accelerates the stabilization speed of the composite medicament on the lead, improves the treatment capacity of the medicament on the lead, enables the finally formed composite medicament to have a better repairing effect on the chromium-polluted soil, and the soil repaired by the composite medicament can meet the requirement of in-situ backfilling. The introduction of the acid activated blast furnace slag reduces the dosage of the phosphate source and avoids the problem of secondary soil pollution caused by excessive use of the phosphate source. The raw materials used by the compound medicament are cheap and easy to obtain, the cost is low, and the compound medicament is suitable for popularization and use.
Description
Technical Field
The invention belongs to the technical field of heavy metal contaminated soil remediation, and particularly relates to a lead contaminated soil stabilizing compound agent and a using method thereof.
Background
Lead is a heavy metal element with the largest content in the earth crust, has high toxicity and long half-life period, and is easy to be absorbed and enriched by the human body. Lead can enter human body by means of contact with food, air and body, and can cause damage to nervous system, hematopoietic system, digestive system, cardiovascular system, immune system and kidney. At present, lead is used as a gasoline explosion-proof agent, a paint stabilizer and the like in a large amount, wherein 40 ten thousand tons of lead is discharged into the atmosphere through gasoline combustion, and 500 ten thousand tons of lead is discharged into the environment through paint, so that the soil beside a road, a lead mine, a paint factory and the surrounding soil of a chemical plant are seriously polluted by lead.
The remediation method of lead-contaminated soil mainly comprises a leaching method, a solidification/stabilization method, an electrokinetic remediation method and a bioremediation method, wherein the solidification/stabilization technology is widely concerned and applied due to low treatment cost, simple operation and easy implementation. The stabilizing agent of lead mainly comprises phosphate, sulfide and some organic polymer chelating agents, wherein the lead phosphate precipitate formed by the phosphate and the lead is most stable in property. Phosphate is often used as a stabilizing agent of lead, the action mechanism of the phosphate is mainly to produce low-solubility lead phosphate precipitates through the reaction of phosphorus and water-soluble lead in soil, the leaching concentration of the lead in the soil is reduced, but the phosphate serving as a stabilizing agent of the lead only has a good stabilizing effect on water-soluble lead, and the phosphate has the problems of low reaction speed, limited stabilizing capability, secondary pollution caused by soil eutrophication due to excessive use and the like. Therefore, a lead-polluted soil stabilizing compound medicament which has a stabilizing effect on various forms of lead, has a high reaction speed and strong stabilizing capability and can effectively avoid the problem of secondary pollution caused by excessive use of phosphate is urgently needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a composite stabilizing agent for lead-contaminated soil; the other purpose is to provide a use method of the lead polluted soil stabilizing compound agent.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a lead-contaminated soil stabilization composite reagent comprises, by mass, 35-90% of acid-activated blast furnace slag and 10-65% of a phosphate source; the phosphorus content in the phosphate source is more than 5 wt%.
Preferably, the acid-activated blast furnace slag is prepared as follows: grinding and sieving blast furnace slag, adding the ground blast furnace slag into an acid solution to form a suspension, stirring and activating, and then filtering, washing, drying and grinding to obtain the iron-based composite material.
Preferably, H in the acid solution+The concentration is 1-4 mol/L; the mass fraction of the blast furnace slag in the suspension is 5-20%; the activation is specifically activated for 0.5-2h at 25-95 ℃.
Preferably, the blast furnace slag is ground to a particle size of-80 mesh.
Preferably, Al in the blast furnace slag2O3、SiO2The CaO and the MgO are sequentially 10-20%, 30-40% and 0-15% in percentage by mass.
Preferably, the drying is carried out at 60-105 ℃ to constant weight.
Preferably, the acid solution is one of hydrochloric acid, sulfuric acid or nitric acid.
Preferably, the particle size of the acid-activated blast furnace slag is-100 mesh.
Preferably, the phosphate source is one or more of phosphate or a phosphorus-containing fertilizer.
Preferably, the phosphate is one of potassium dihydrogen phosphate or sodium dihydrogen phosphate; the phosphorus-containing fertilizer is one of calcium superphosphate, calcium magnesium phosphate, triple superphosphate or monoammonium phosphate.
Preferably, the compound medicament comprises 80-90% of acid activated blast furnace slag and 10-20% of monopotassium phosphate by mass percentage.
Preferably, the compound medicament comprises 35-60% of acid activated blast furnace slag and 40-65% of calcium magnesium phosphate fertilizer by mass percent; the phosphorus content in the calcium magnesium phosphate fertilizer is 5.2 to 7.86 weight percent.
Preferably, the compound medicament comprises 57-77% of acid activated blast furnace slag, 3-10% of monopotassium phosphate and 20-35% of calcium magnesium phosphate fertilizer by mass percent; the phosphorus content in the calcium magnesium phosphate fertilizer is 5.2 to 7.86 weight percent.
2. The use method of the lead-polluted soil stabilization composite reagent comprises the following steps: and uniformly mixing the composite medicament and the lead-polluted soil according to the total adding amount of the composite medicament being 1-10% of the mass of the lead-polluted soil, then adding water until the water content in the lead-polluted soil is 30-40 wt%, uniformly mixing again, and then sealing and maintaining for 3-7 days.
The invention has the beneficial effects that: the invention provides a lead-polluted soil stabilizing compound medicament and a use method thereof, the lead-polluted soil stabilizing compound medicament comprises acid activated blast furnace slag and a phosphate source, the acid activated blast furnace slag is used for replacing part of the phosphate source to stabilize lead in the polluted soil by reasonably controlling the use amount of the acid activated blast furnace slag and the phosphate source, the synergistic effect between the acid activated blast furnace slag and the phosphate source accelerates the stabilizing speed of the compound medicament on the lead, the treatment capacity of the medicament on the lead is improved, the finally formed compound medicament has a better repairing effect on chromium-polluted soil, and the soil repaired by the compound medicament can meet the requirement of in-situ backfilling. Wherein, the blast furnace slag is solid waste generated in iron making, has larger specific surface area and abundant pore structure, and Al in the blast furnace slag structure3+And Si4+Is easy to be replaced by low-valent cations and takes negative charges, so that the blast furnace slag has good cation adsorption performance, the specific surface area of the blast furnace slag can be further increased after the blast furnace slag is activated by acid, and the Pb of the blast furnace slag is improved2+The adsorption capacity of the acid activated blast furnace slag is mainly dependent on physical adsorption effects such as Van der Waals force, electrostatic adsorption and the like, the action speed is high, and the acid activated blast furnace slag has certain adsorption effect on various forms of lead. The stabilization of lead by phosphate sources is mainly dependent on its interaction with Pb2+By chemical reaction to give a compound of low solubilityThe lead phosphate precipitates have stable action, but slow reaction speed and poor treatment effect on the water-insoluble lead, the acid activated blast furnace slag and the phosphate source are prepared into the composite medicament according to a certain proportion, the adsorption and enrichment effect of the acid activated blast furnace slag on the lead is utilized, the contact chance of the phosphate source and the lead is increased, and the reaction of the phosphate source and the lead is promoted, so that the acid activated blast furnace slag and the phosphate source play a good synergistic effect, the reaction speed of the lead precipitation is accelerated, and the stabilization capability of the composite medicament on various forms of lead is effectively enhanced. In addition, the introduction of the acid activated blast furnace slag reduces the dosage of the phosphate source, and avoids the problem of secondary soil pollution caused by excessive use of the phosphate source. The raw materials used by the composite medicament are cheap and easy to obtain, the cost of the medicament is effectively reduced, and the composite medicament is suitable for popularization and use.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
A composite stabilizing agent for lead-polluted soil comprises 37.5% of acid activated blast furnace slag with a granularity of-100 meshes and 62.5% of calcium magnesium phosphate with a phosphorus content of 5.2 wt%. Wherein the acid-activated blast furnace slag is prepared by the following method:
grinding blast furnace slag, sieving with 80 mesh sieve, and adding H+Forming a suspension in 2.5mol/L hydrochloric acidThe mass fraction of blast furnace slag is 10%, stirring and activating for 2h at 25 ℃, then drying to constant weight at 100 ℃ after filtering and washing, and grinding and sieving with a 100-mesh sieve to obtain the product, wherein the blast furnace slag contains Al2O3、SiO2And the mass percentages of CaO and MgO are 15%, 40%, 30% and 12% in sequence.
Weighing 200g of lead-contaminated soil sample into a 1L polypropylene box, adding 16g of the compound medicament in the embodiment 1, stirring for 1min in a dry mixing mode, adding 75.6mL of deionized water to enable the water content of the soil to be 35%, stirring for 2min, uniformly mixing, covering, sealing and maintaining for 5 days, drying the sample at 35 ℃ after maintenance, and testing the lead leaching concentration of the dried sample according to a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300 + 2007).
And (3) testing results: through the stabilization of the composite medicament obtained by the embodiment, the lead leaching concentration of the polluted soil is reduced to 1.91mg/L from 34.96mg/L, and the reduction rate is 94.5%.
Example 2
A lead contaminated soil stabilization composite reagent comprises 83.3% of acid activated blast furnace slag with a granularity of-100 meshes and 16.7% of monopotassium phosphate by mass percent. Wherein the acid-activated blast furnace slag is prepared by the following method:
grinding blast furnace slag, sieving with 80 mesh sieve, and adding H+Forming suspension in 4mol/L sulfuric acid, wherein the mass fraction of blast furnace slag in the suspension is 20%, stirring and activating for 2h at 25 ℃, then drying to constant weight at 80 ℃ after filtering and washing, and grinding and sieving with a 100-mesh sieve to obtain the product, wherein Al in the blast furnace slag2O3、SiO2And the mass percentages of CaO and MgO are 15%, 35%, 40% and 10% in sequence.
Weighing 200g of lead-contaminated soil sample into a 1L polypropylene box, adding 6g of the compound agent in the embodiment 2, stirring for 1min in a dry mixing mode, adding 72.1mL of deionized water to enable the water content of the soil to be 35%, stirring for 2min, uniformly mixing, covering, sealing and maintaining for 5 days, drying the sample at 35 ℃ after maintenance, and testing the lead leaching concentration of the dried sample according to a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300 + 2007).
And (3) testing results: through the stabilization of the composite medicament obtained by the embodiment, the lead leaching concentration of the polluted soil is reduced to 2.61mg/L from 34.35mg/L, and the reduction rate is 92.4%.
Example 3
A composite stabilizing agent for lead-polluted soil comprises, by mass, 60% of acid-activated blast furnace slag with a particle size of-100 meshes, 10% of monopotassium phosphate and 30% of calcium magnesium phosphate fertilizer with a phosphorus content of 7.86 wt%. Wherein the acid-activated blast furnace slag is prepared by the following method:
grinding blast furnace slag, sieving with 80 mesh sieve, and adding H+Forming suspension in 1mol/L nitric acid, wherein the mass fraction of blast furnace slag in the suspension is 5%, stirring and activating for 0.5h at 95 ℃, then drying to constant weight at 60 ℃ after filtering and washing, and grinding and sieving with a 100-mesh sieve to obtain the product, wherein Al in the blast furnace slag2O3、SiO2And the mass percentages of CaO and MgO are 20%, 35% and 15% in sequence.
Weighing 200g of lead-contaminated soil sample into a 1L polypropylene box, adding 10g of the compound agent in the embodiment 3, stirring for 1min in a dry mixing mode, adding 84.0mL of deionized water to enable the water content of the soil to be 40%, stirring for 2min, uniformly mixing, covering, sealing and maintaining for 7 days, drying the sample at 35 ℃ after maintenance is finished, and testing the lead leaching concentration of the dried sample according to a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300 + 2007).
And (3) testing results: through the stabilization of the composite medicament obtained by the embodiment, the lead leaching concentration of the polluted soil is reduced to 0.56mg/L from 34.35mg/L, and the reduction rate is 98.4%.
Example 4
A lead contaminated soil stabilization composite reagent comprises 80% of acid activated blast furnace slag with the granularity of-100 meshes and 20% of sodium dihydrogen phosphate in percentage by mass. Wherein the acid-activated blast furnace slag is prepared by the following method:
grinding blast furnace slag, sieving with 80 mesh sieve, and adding H+Forming a suspension of blast furnace slag in 3mol/L sulfuric acid, wherein the mass fraction of the blast furnace slag in the suspension is 15%Stirring and activating for 1.5h at 50 ℃, then drying to constant weight at 105 ℃ after filtering and washing, and grinding and sieving with a 100-mesh sieve to obtain the product, wherein Al in blast furnace slag2O3、SiO2CaO and MgO in the following mass percentage of 10%, 40% and 8%.
Weighing 200g of lead-contaminated soil sample into a 1L polypropylene box, adding 8g of the compound agent in the embodiment 4, stirring for 1min in a dry mixing mode, adding 62.4mL of deionized water to enable the water content of the soil to be 30%, stirring for 2min, uniformly mixing, covering, sealing and maintaining for 3 days, drying the sample at 35 ℃ after maintenance is finished, and testing the lead leaching concentration of the dried sample according to a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300 + 2007).
And (3) testing results: through the stabilization of the composite medicament obtained by the embodiment, the lead leaching concentration of the polluted soil is reduced to 2.75mg/L from 30.59mg/L, and the reduction rate is 91.0%.
Example 5
A composite chemical for stabilizing lead-polluted soil contains (by mass%) 62.5% of acid-activated blast furnace slag with a particle size of-100 meshes and 37.5% of monoammonium phosphate with a phosphorus content of 20 wt%. Wherein the acid-activated blast furnace slag is prepared by the following method:
grinding blast furnace slag, sieving with 80 mesh sieve, and adding H+Forming a suspension in hydrochloric acid with the concentration of 3.5mol/L, wherein the mass fraction of blast furnace slag in the suspension is 18 percent, stirring and activating for 1 hour at the temperature of 60 ℃, then drying to constant weight at the temperature of 60 ℃ after filtering and washing, and grinding and sieving with a 100-mesh sieve to obtain the product, wherein Al in the blast furnace slag2O3、SiO2And the mass percentages of CaO and MgO are 20%, 30% and 7% in sequence.
Weighing 200g of lead-contaminated soil sample into a 1L polypropylene box, adding 15g of the compound agent in the embodiment 5, stirring for 1min in a dry mixing mode, adding 64.5mL of deionized water to enable the water content of the soil to be 30%, stirring for 2min, uniformly mixing, covering, sealing and maintaining for 3 days, drying the sample at 35 ℃ after maintenance is finished, and testing the lead leaching concentration of the dried sample according to a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300 + 2007).
And (3) testing results: through the stabilization of the composite medicament obtained by the embodiment, the lead leaching concentration of the polluted soil is reduced to 2.43mg/L from 30.59mg/L, and the reduction rate is 92.1%.
Example 6
A composite agent for stabilizing lead-contaminated soil comprises 57% by mass of acid-activated blast furnace slag with a particle size of-100 meshes and 43% by mass of triple superphosphate with a phosphorus content of 15% by weight. Wherein the acid-activated blast furnace slag is prepared by the following method:
grinding blast furnace slag, sieving with 80 mesh sieve, and adding H+Forming suspension in 2mol/L nitric acid, wherein the mass fraction of blast furnace slag in the suspension is 10%, stirring and activating for 2h at 25 ℃, then drying to constant weight at 80 ℃ after filtering and washing, and grinding and sieving with a 100-mesh sieve to obtain the product, wherein Al in the blast furnace slag2O3、SiO2CaO and MgO in the following mass percentage of 10%, 30%, 35% and 15%.
Weighing 200g of lead-contaminated soil sample into a 1L polypropylene box, adding 20g of the compound agent in the embodiment 6, stirring for 1min in a dry mixing mode, adding 88mL of deionized water to enable the water content of the soil to be 40%, stirring for 2min, uniformly mixing, covering, sealing and maintaining for 7 days, drying the sample at 35 ℃ after maintenance, and testing the lead leaching concentration of the dried sample according to a solid waste leaching toxicity leaching acetic acid buffer solution method (HJ/T300-plus 2007).
And (3) testing results: through the stabilization of the composite medicament obtained by the embodiment, the lead leaching concentration of the polluted soil is reduced to 2.34mg/L from 34.35mg/L, and the reduction rate is 93.2%.
Examples 1-6 show that the prepared acid activated blast furnace slag and phosphate source composite medicament has good stabilizing effect on lead in the polluted soil, and the lead leaching concentration of the polluted soil is reduced by more than 90% after the composite material is treated.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The lead-polluted soil stabilization composite agent is characterized by comprising, by mass, 35-90% of acid-activated blast furnace slag and 10-65% of phosphate source; the phosphorus content in the phosphate source is more than 5 wt%.
2. The lead-contaminated soil stabilization composite agent according to claim 1, wherein the acid-activated blast furnace slag is prepared by the following method: grinding and sieving blast furnace slag, adding the ground blast furnace slag into an acid solution to form a suspension, stirring and activating, and then filtering, washing, drying and grinding to obtain the iron-based composite material.
3. The lead-contaminated soil stabilization composite agent according to claim 2, wherein H in the acid solution+The concentration is 1-4 mol/L; the mass fraction of the blast furnace slag in the suspension is 5-20%; the activation is specifically activated for 0.5-2h at 25-95 ℃.
4. The lead-contaminated soil stabilization composite reagent according to claim 3, wherein the acid solution is one of hydrochloric acid, sulfuric acid or nitric acid.
5. The lead-contaminated soil stabilization composite agent according to any one of claims 1 to 4, wherein the phosphate source is one or more of phosphate or a phosphorus-containing fertilizer.
6. The lead-contaminated soil stabilization complex reagent according to claim 5, wherein the phosphate is one of potassium dihydrogen phosphate or sodium dihydrogen phosphate; the phosphorus-containing fertilizer is one of calcium superphosphate, calcium magnesium phosphate, triple superphosphate or monoammonium phosphate.
7. The compound agent for stabilizing lead-contaminated soil according to claim 6, wherein the compound agent comprises 80-90% by mass of acid-activated blast furnace slag and 10-20% by mass of monopotassium phosphate.
8. The compound medicament for stabilizing lead-contaminated soil according to claim 6, wherein the compound medicament comprises 35-60% by mass of acid-activated blast furnace slag and 40-65% by mass of calcium magnesium phosphate; the phosphorus content in the calcium magnesium phosphate fertilizer is 5.2 to 7.86 weight percent.
9. The compound medicament for stabilizing lead-contaminated soil according to claim 6, wherein the compound medicament comprises 57-77% by mass of acid-activated blast furnace slag, 3-10% by mass of monopotassium phosphate and 20-35% by mass of calcium magnesium phosphate; the phosphorus content in the calcium magnesium phosphate fertilizer is 5.2 to 7.86 weight percent.
10. The use method of the lead-contaminated soil stabilization composite reagent according to any one of claims 1 to 9, characterized in that the method comprises the following steps: and uniformly mixing the composite medicament and the lead-polluted soil according to the total adding amount of the composite medicament being 1-10% of the mass of the lead-polluted soil, then adding water until the water content in the lead-polluted soil is 30-40 wt%, uniformly mixing again, and then sealing and maintaining for 3-7 days.
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Cited By (1)
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| CN114574215A (en) * | 2022-04-08 | 2022-06-03 | 湖南省和清环境科技有限公司 | Mining area soil stabilizer and preparation method and application thereof |
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Application publication date: 20200529 |