CN110669524A - Cadmium-arsenic polluted soil remediation agent - Google Patents
Cadmium-arsenic polluted soil remediation agent Download PDFInfo
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- CN110669524A CN110669524A CN201910853631.0A CN201910853631A CN110669524A CN 110669524 A CN110669524 A CN 110669524A CN 201910853631 A CN201910853631 A CN 201910853631A CN 110669524 A CN110669524 A CN 110669524A
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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
- C09K17/40—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
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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
- C09K2101/00—Agricultural use
Abstract
The invention belongs to the technical field of soil repairing agents, and particularly relates to a cadmium-arsenic polluted soil repairing agent, which is prepared by mixing manganese ore slag and goethite slag, crushing the mixture, and sieving the crushed mixture with a 200-mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding 15-20% of surfactant into the mixed powder, carrying out heat preservation treatment for 20-30min, cooling to normal temperature, and carrying out flash explosion treatment and passivation treatment to obtain the catalyst; the repairing agent provided by the invention can be used for effectively repairing soil polluted by cadmium and arsenic, has a microbial inoculum with a function of inhibiting harmful microorganisms, and also has the function of preventing heavy metal from being redissolved. The goethite and manganese slag are used as curing agents of cadmium and arsenic, the ion mobility is reduced, the re-dissolution is realized, the curing effect is improved, and the surfactant is added into the molten state, so that the specific surface area is increased, the adsorption capacity of cadmium and arsenic in soil is improved, and the cadmium and arsenic in the soil can enter crystal lattices.
Description
Technical Field
The invention belongs to the technical field of soil remediation agents, and particularly relates to a cadmium-arsenic polluted soil remediation agent.
Background
The tailings waste land, also called a tailings pond, is the most common and most difficult-to-treat waste land bare land of a metal mine, and not only is serious in heavy metal pollution per se, but also is a durable heavy metal pollution source. Toxic and harmful substances in the tailings are easy to diffuse along with rainwater and flying dust, so that surrounding soil, water and atmosphere are polluted, serious ecological environment problems are caused, and the health of local people is threatened.
Cause heavy gold in soilThe main elements of the pollution include Cd, Ni, As, Cu, Hg, Pb, Cr and Zn, the point standard exceeding rates are respectively 7.0%, 4.8%, 2.7%, 2.1%, 1.6%, 1.5%, 1.1% and 0.9%, heavy metals often exist in a compound form, and the Cd-As compound pollution is particularly common. Cd and As in the soil can be transferred and amplified through a food chain and an ecological chain, and thus, the ecological safety and the human health are threatened. In order to reduce the migration and transformation capacity of Cd and As, a passivant is often applied to change the occurrence form of Cd-As in soil and reduce the bioavailability of Cd-As. The chemical behaviors of Cd and As in soil are quite different, and the single passivator is difficult to simultaneously reduce the biological effectiveness of Cd and As, so that a composite passivator is required. At present, partial researches on Cd-As composite pollution passivators are carried out, such As red mud and FeSO4The compound pair of Cd and As has good passivation effect, and the ground phosphate rock and FeSO4The compounding can effectively reduce the content of Cd and As in an effective state, CaCO3The content of exchange Cd and As can be effectively reduced by compounding with iron powder. However, the existing composite passivator still has certain defects, such as that the red mud may contain a certain amount of harmful components, and has the risk of causing secondary pollution; the eutrophication of the water body environment is easily caused by the excessive application of the phosphorus-containing substances. Therefore, an environment-friendly Cd-As composite pollution passivating agent is required to be searched.
The patent number CN201811616618.5 discloses a passivator for repairing cadmium and arsenic polluted farmland, a preparation method and a repairing method, wherein the passivator for repairing cadmium and arsenic polluted farmland comprises the following components in percentage by mass: biochar: 20 to 30 percent; active bacteria: 10% -20%; reduced iron powder: 10% -20%; calcium magnesium phosphate fertilizer: 10% -20%; bentonite: 20 to 30 percent. The invention aims to provide the passivating agent which is low in cost, green and environment-friendly and does not cause secondary pollution.
Patent No. CN201910370087.4 provides a cadmium-arsenic composite pollution repairing agent based on natural macromolecular organic matters, and the preparation method comprises the following steps: (1) preprocessing straws to obtain a mixture A; (2) adding metal ions into the mixture A to precipitate water-soluble macromolecular organic matters and OH < - >, filtering to obtain filter residues, cleaning, filtering, drying and crushing to obtain a mixture B; (3) compounding the calcium carbonate, the wollastonite and the mixture B to obtain the cadmium-arsenic composite pollution repairing agent. The cadmium-arsenic composite pollution repairing agent provided by the invention can effectively reduce the activity of cadmium and influence the dissolution of arsenic; the heavy metal adsorption and passivation effect is good, soil organic matters can be increased, the soil structure is improved, and the plant growth is promoted.
In the prior art, the modified biochar is adopted to treat cadmium and arsenic pollution to obtain a certain effect, but the biochar and the carbon nitrogen phosphorus modifier play a positive role in microbial activity, so that the unbalanced distribution of microorganisms is easily caused.
Disclosure of Invention
The invention provides a cadmium-arsenic polluted soil remediation agent for solving the technical problems.
The method is realized by the following technical scheme:
a cadmium-arsenic contaminated soil remediation agent is prepared by mixing manganese ore slag and goethite slag, pulverizing, and sieving with 200 mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding 15-20% of surfactant into the mixed powder, carrying out heat preservation treatment for 20-30min, cooling to normal temperature, and carrying out flash explosion treatment and passivation treatment to obtain the catalyst.
The surfactant comprises the following components in parts by weight: 30-36 parts of binding material, 5-9 parts of active material and 1-6 parts of excitant.
The binding material is cement and glass fiber, and the weight ratio of the binding material to the cement is 1: (5-9) mass ratio.
The active material comprises the following materials in parts by weight: 1-5 parts of tricalcium aluminate, 7-11 parts of sodium thiosulfate and 5-13 parts of sodium lignosulfonate.
The excitant consists of the following materials in parts by weight: 10-13 parts of urea, 3-7 parts of sodium carbonate and 1-2 parts of sodium hydroxide.
The preparation method of the surfactant comprises the following steps: weighing the bonding material, the active material and the excitant, and grinding the materials until the Boehringer specific surface area is 5000-7000cm2And/g, fully mixing, placing in a reaction kettle, and performing ultrasonic activation at the temperature of 70-90 ℃ for 30-40min to obtain the product.
The working conditions of the ultrasonic activation are as follows: the frequency is 55-60kHz, and the power is 300-400W.
During the flash explosion treatment, the flash explosion pressure is 0.5-1.2MPa, the pressure maintaining time is 10-30s, and then the flash explosion pressure is 2-3.8MPa, and the pressure maintaining time is 60-120 s.
The passivation treatment is to immerse the substance obtained by flash explosion treatment into phosphoric acid passivation solution for the first passivation treatment, heat the substance to keep the temperature of the phosphoric acid passivation solution at 50-60 ℃, dry the substance after passivation treatment for 120-200s, immerse the substance into silane passivation solution for the second passivation treatment, heat the substance to keep the temperature of the silane passivation solution at 65-70 ℃, and simultaneously introduce a current density of 100-118mA/dm into the silane passivation solution2And (4) passivating for 5-10 s.
The phosphoric acid passivation solution used in the first passivation treatment is prepared from deionized water and 65-75% phosphoric acid by mass concentration; the amount of the phosphoric acid passivation solution used is 1.5-2.0ml per gram of the mixed powder.
In the second passivation treatment, the silane passivation solution comprises the following components in parts by weight: 1-5ml/L of silane coupling agent, 1-4mg/L of active carbon, 0.3-0.8mg/L of lithium carbonate, 0.1-0.3mg/L of zinc oxide and the balance of water; the amount of the silane passivation solution used is 1.5-2.0ml per gram of the mixed powder.
Has the advantages that:
the repairing agent provided by the invention can be used for effectively repairing soil polluted by cadmium and arsenic, has a microbial inoculum with a function of inhibiting harmful microorganisms, and also has the function of preventing heavy metal from being redissolved. The goethite and manganese slag are used as curing agents of cadmium and arsenic, the ion mobility is reduced, the re-dissolution is realized, the curing effect is improved, and the surfactant is added into the molten state, so that the specific surface area is increased, the adsorption capacity of cadmium and arsenic in soil is improved, and the cadmium and arsenic in the soil can enter crystal lattices.
The invention reasonably mixes the components according to the properties, chemical component properties and the like of the bonding material, the active material and the excitant to form firm polycrystalline aggregates on the interfaces of the goethite and the manganese slag, thereby improving the essence of the contact of the solid-phase interfaces of the goethite and the manganese slag and leading the solid-phase interfaces to generate higher strength and stability.
The invention carries out the first passivation to promote the generation of the ferrous phosphate film layer, and carries out the second passivation treatment by using the silane passivation solution, the silane film formed by the passivation not only has the hole sealing effect on the ferrous phosphate film layer, but also has the bacteriostasis and adsorption effects to adjust the soil microorganism state, simultaneously effectively adsorbs cadmium and arsenic, and carries out the activity excitation on the adsorption component and the antibacterial component under the action of current through the current application treatment. Through two times of passivation treatment, the surfaces of the particles of the repairing agent are passivated, the surface charges of the particles are reduced, and the agglomeration among the nano particles is reduced.
According to the invention, through flash explosion treatment, huge molecular net structures can be formed on the surfaces of the goethite and the manganese slag, so that the goethite and the manganese slag are combined into a winding structure of the damaged glass fiber.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
A cadmium-arsenic contaminated soil remediation agent is prepared by mixing manganese ore slag and goethite slag, pulverizing, and sieving with 200 mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding 20% of surfactant into the mixed powder, carrying out heat preservation treatment for 30min, cooling to normal temperature, and carrying out flash explosion treatment and passivation treatment to obtain the catalyst;
the surfactant comprises the following components in parts by weight: 36 parts of binding material, 9 parts of active material and 6 parts of excitant;
the binding material is cement and glass fiber, and the weight ratio of the binding material to the cement is 1: 9 in mass ratio;
the active material comprises the following materials in parts by weight: 5 parts of tricalcium aluminate, 11 parts of sodium thiosulfate and 13 parts of sodium lignosulfonate;
the excitant consists of the following materials in parts by weight: 13 parts of urea, 7 parts of sodium carbonate and 2 parts of sodium hydroxide;
the preparation method of the surfactant comprises the following steps: weighing the binding material, the active material and the activator, and grinding the materials to reach the Brinell specific surface area7000cm2Mixing thoroughly, placing in a reaction kettle, and ultrasonically activating at 90 deg.C for 40min to obtain the final product;
the working conditions of the ultrasonic activation are as follows: the frequency is 60kHz, and the power is 400W;
during the flash explosion treatment, firstly, the flash explosion pressure is 1.2MPa, the pressure maintaining time is 30s, and then, the flash explosion pressure is 3.8MPa, and the pressure maintaining time is 120 s;
the passivation treatment is to immerse the substance obtained by flash explosion treatment into a phosphoric acid passivation solution for the first passivation treatment, heat the substance to keep the temperature of the phosphoric acid passivation solution at 60 ℃ during the first passivation treatment, spin-dry the substance after the passivation treatment is carried out for 200s, immerse the substance into a silane passivation solution for the second passivation treatment, heat the substance to keep the temperature of the silane passivation solution at 70 ℃ during the second passivation treatment, and simultaneously introduce a current with the density of 118mA/dm into the silane passivation solution2Passivation treatment for 10 s;
the phosphoric acid passivation solution used in the first passivation treatment is prepared from deionized water and phosphoric acid with the mass concentration of 75%; the amount of the phosphoric acid passivation solution used is 2.0ml for each gram of the mixed powder;
in the second passivation treatment, the silane passivation solution comprises the following components in parts by weight: 5ml/L of silane coupling agent, 4mg/L of active carbon, 0.8mg/L of lithium carbonate, 0.3mg/L of zinc oxide and the balance of water; the amount of the silane passivation solution used was 2.0ml per gram of the powder mixture.
Example 2
A cadmium-arsenic contaminated soil remediation agent is prepared by mixing manganese ore slag and goethite slag, pulverizing, and sieving with 200 mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding 15% of surfactant into the mixed powder, carrying out heat preservation treatment for 20min, cooling to normal temperature, and carrying out flash explosion treatment and passivation treatment to obtain the catalyst;
the surfactant comprises the following components in parts by weight: 30 parts of binding material, 5 parts of active material and 1 part of excitant;
the binding material is cement and glass fiber, and the weight ratio of the binding material to the cement is 1: 5 in mass ratio;
the active material comprises the following materials in parts by weight: 1 part of tricalcium aluminate, 7 parts of sodium thiosulfate and 5 parts of sodium lignosulfonate;
the excitant consists of the following materials in parts by weight: 10 parts of urea, 3 parts of sodium carbonate and 1 part of sodium hydroxide;
the preparation method of the surfactant comprises the following steps: weighing the bonding material, the active material and the activator, and grinding to reach a Brinell specific surface area of 5000cm2Mixing thoroughly, placing in a reaction kettle, and ultrasonically activating at 70 deg.C for 30min to obtain the final product;
the working conditions of the ultrasonic activation are as follows: the frequency is 55kHz, and the power is 300W;
during the flash explosion treatment, firstly, the flash explosion pressure is 0.5MPa, the pressure maintaining time is 10s, and then, the flash explosion pressure is 2MPa, and the pressure maintaining time is 60 s;
the passivation treatment is to immerse the substance obtained by flash explosion treatment into a phosphoric acid passivation solution for the first passivation treatment, heat the substance to keep the temperature of the phosphoric acid passivation solution at 50 ℃ during the first passivation treatment, spin-dry the substance after the passivation treatment is carried out for 120s, immerse the substance into a silane passivation solution for the second passivation treatment, heat the substance to keep the temperature of the silane passivation solution at 65 ℃ during the second passivation treatment, and simultaneously introduce a current with the density of 100mA/dm into the silane passivation solution2Passivating for 5 s;
the phosphoric acid passivation solution used in the first passivation treatment is prepared from deionized water and phosphoric acid with the mass concentration of 65%; the amount of the phosphoric acid passivation solution used is 1.5ml per gram of the mixed powder;
in the second passivation treatment, the silane passivation solution comprises the following components in parts by weight: 1ml/L of silane coupling agent, 1mg/L of active carbon, 0.3mg/L of lithium carbonate, 0.1mg/L of zinc oxide and the balance of water; the amount of the silane passivation solution used was 1.5ml per gram of the powder mixture.
Example 3
A cadmium-arsenic contaminated soil remediation agent is prepared by mixing manganese ore slag and goethite slag, pulverizing, and sieving with 200 mesh sieve to obtain mixed powder; calcining the mixed powder to a molten state, adding 18% of surfactant into the mixed powder, carrying out heat preservation treatment for 25min, cooling to normal temperature, and carrying out flash explosion treatment and passivation treatment to obtain the catalyst;
the surfactant comprises the following components in parts by weight: 33 parts of binding material, 7 parts of active material and 4 parts of excitant;
the binding material is cement and glass fiber, and the weight ratio of the binding material to the cement is 1: 7 in a mass ratio;
the active material comprises the following materials in parts by weight: 3 parts of tricalcium aluminate, 9 parts of sodium thiosulfate and 9 parts of sodium lignosulfonate;
the excitant consists of the following materials in parts by weight: 12 parts of urea, 5 parts of sodium carbonate and 1.5 parts of sodium hydroxide;
the preparation method of the surfactant comprises the following steps: weighing the bonding material, the active material and the excitant, and grinding to reach a Brinell specific surface area of 6000cm2Mixing thoroughly, placing in a reaction kettle, and ultrasonically activating at 80 deg.C for 35min to obtain the final product;
the working conditions of the ultrasonic activation are as follows: the frequency is 57kHz, and the power is 350W;
during flash explosion treatment, firstly, the flash explosion pressure is 0.8MPa, the pressure maintaining time is 20s, and then, the flash explosion pressure is 3MPa, and the pressure maintaining time is 90 s;
the passivation treatment is to immerse the substance obtained by flash explosion treatment into a phosphoric acid passivation solution for the first passivation treatment, heat the substance to keep the temperature of the phosphoric acid passivation solution at 55 ℃ during the first passivation treatment, spin-dry the substance after the passivation treatment is carried out for 150s, immerse the substance into a silane passivation solution for the second passivation treatment, heat the substance to keep the temperature of the silane passivation solution at 67 ℃ during the second passivation treatment, and simultaneously introduce a current with the density of 109mA/dm into the silane passivation solution2Passivating for 8 s;
the phosphoric acid passivation solution used in the first passivation treatment is prepared from deionized water and phosphoric acid with the mass concentration of 70%; the amount of the phosphoric acid passivation solution used is 1.7ml per gram of the mixed powder;
in the second passivation treatment, the silane passivation solution comprises the following components in parts by weight: 3ml/L of silane coupling agent, 2mg/L of active carbon, 0.5mg/L of lithium carbonate, 0.2mg/L of zinc oxide and the balance of water; the amount of the silane passivation solution used was 1.8ml per gram of the powder mixture.
The repairing agent can be used independently or mixed with base fertilizer and/or compound fertilizer, and the annual usage amount per mu is 10-15 kg. The repairing agent can obviously reduce the total content and the effective state content of cadmium and arsenic in soil and can kill pathogenic bacteria and nematodes in the soil.
Collecting As and Cd combined pollution soil near a mining area in the copper-nut city of Guizhou province from 5 months 1 days in 2017 to 6 months 10 days in 2017, wherein the Cd content of the soil is 28.7 times of the national soil environment quality secondary standard (GB 15618-. The addition amount of the repairing agent is set to be 0.02kg/m2. The soil and the repairing agent are fully mixed and then are put into a plastic pot, a plastic film is used for sealing, and a plurality of small holes are punched to ensure that air inside and outside the pot freely circulates. Periodically adding deionized water to keep the water content at 70% of the maximum field water capacity of the soil, and culturing at room temperature for 30 d;
full digestion of all samples was digested with HF-HCLO4-HNO3 mixed acid in a Teflon crucible and then assayed with ICPOES. The specific test method comprises the following steps: atomic absorption and atomic fluorescence. The total cadmium content in the soil is determined according to GB/T17141-1997, the total arsenic content in the soil is determined by adopting an atomic fluorescence method, and the effective state content of the cadmium and the arsenic in the soil is determined by adopting diethylenetriamine pentaacetic acid extraction/inductively coupled plasma atomic emission spectrometry.
The result shows that after the repairing agent is applied to the composite contaminated soil, the contents of the available As and the available Cd in the soil are respectively reduced by 20.1 percent and 23.5 percent.
Test example 1
The repairing agent test is carried out on a Wanshan area konjak demonstration field block of cupren City of Guizhou province. The konjak is susceptible to bacterial soft rot, and the konjak generally grows for 2-3 years, because the soft rot is a soil-borne disease, continuous cropping can not be realized. This test followed two years on the same field, 2016 from 5 months to 2018 from 12 months.
The plot control test was performed on 2 acres of test plots. The experimental design was as follows:
control group: 50kg of nitrogen-phosphorus-potassium compound fertilizer is applied to each mu;
test groups: applying 50kg of nitrogen-phosphorus-potassium compound fertilizer and a repairing agent (10 kg/mu) per mu;
wherein the mixing ratio of the nitrogenous fertilizer, the phosphate fertilizer and the potash fertilizer is 18:5: 7;
the seeds for the test are the same in batch, the seed treatment method is the same, the fertility and the drainage level of the selected test field of the control group and the test group are equivalent, and the interplanting of corn is adopted to shade. The cell is repeated for three times, and each cell is provided with a protection row for planting the corn. The test investigation period was two years, including the incidence of soft rot. The incidence of soft rot is investigated twice a year, in the early 6 middle of the onset and in the high-grade of the onset respectively. The mode of investigation of the incidence of disease is as follows: randomly selecting a line of konjak, and investigating the number of diseased plants. The results of the disease incidence survey are shown in table 1:
TABLE 1 survey table of incidence of soft rot of konjak
| Investigation time | Control group | EXAMPLE 1 group | EXAMPLE 2 group | EXAMPLE 3 group |
| 2016 month 6 | 7.3％ | 1.8％ | 2.2％ | 1.7％ |
| 2016 (8 months) year | 21.5％ | 3.6％ | 3.9％ | 3.2％ |
| 6 months in 2017 | 8.8％ | 1.5％ | 1.9％ | 1.2％ |
| 8 months in 2017 | 24.9％ | 3.7％ | 3.7％ | 2.9％ |
Claims (9)
1. A cadmium-arsenic contaminated soil remediation agent is characterized in that manganese ore slag and goethite slag are mixed and then crushed to be sieved by a 200-mesh sieve, and mixed powder is obtained; calcining the mixed powder to a molten state, adding 15-20% of surfactant into the mixed powder, carrying out heat preservation treatment for 20-30min, cooling to normal temperature, and carrying out flash explosion treatment and passivation treatment to obtain the catalyst.
2. The cadmium arsenic contaminated soil remediation agent of claim 1 wherein said surfactant comprises, in parts by weight: 30-36 parts of binding material, 5-9 parts of active material and 1-6 parts of excitant.
3. The cadmium arsenic contaminated soil remediation agent of claim 2 wherein said active material comprises, in parts by weight: 1-5 parts of tricalcium aluminate, 7-11 parts of sodium thiosulfate and 5-13 parts of sodium lignosulfonate.
4. The cadmium-arsenic contaminated soil remediation agent of claim 2, wherein the activator comprises the following materials in parts by weight: 10-13 parts of urea, 3-7 parts of sodium carbonate and 1-2 parts of sodium hydroxide.
5. As in claimThe cadmium-arsenic contaminated soil remediation agent of claim 2, wherein the surfactant is prepared by the following steps: weighing the bonding material, the active material and the excitant, and grinding the materials until the Boehringer specific surface area is 5000-7000cm2And/g, fully mixing, placing in a reaction kettle, and performing ultrasonic activation at the temperature of 70-90 ℃ for 30-40min to obtain the product.
6. The cadmium-arsenic contaminated soil remediation agent of claim 1, wherein during said flash explosion treatment, the flash explosion pressure is first 0.5-1.2MPa, the pressure holding time is 10-30s, and then the flash explosion pressure is placed at 2-3.8MPa, and the pressure holding time is 60-120 s.
7. The cadmium-arsenic contaminated soil remediation agent of claim 1, wherein the passivation treatment comprises immersing the substance obtained from the flash explosion treatment in a phosphoric acid passivation solution for a first passivation treatment, wherein the temperature of the phosphoric acid passivation solution is maintained at 50-60 ℃ by heating, and the passivation treatment is performed by spin-drying after 120-200s, and then immersing the substance in a silane passivation solution for a second passivation treatment, wherein the temperature of the silane passivation solution is maintained at 65-70 ℃ by heating, and the current density is increased to 100-118mA/dm2And (4) passivating for 5-10 s.
8. The cadmium-arsenic contaminated soil remediation agent of claim 7 wherein the phosphoric acid passivating solution used in the first passivating treatment is formulated from deionized water and 65-75% phosphoric acid by mass concentration; the amount of the phosphoric acid passivation solution used is 1.5-2.0ml per gram of the mixed powder.
9. The cadmium arsenic contaminated soil remediation agent of claim 7 wherein said silane passivating solution of said second passivating treatment has the following composition and corresponding content: 1-5ml/L of silane coupling agent, 1-4mg/L of active carbon, 0.3-0.8mg/L of lithium carbonate, 0.1-0.3mg/L of zinc oxide and the balance of water; the amount of the silane passivation solution used is 1.5-2.0ml per gram of the mixed powder.
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| CN112495373A (en) * | 2020-12-10 | 2021-03-16 | 重庆大学 | Manganese-containing soil low-temperature denitration catalyst and preparation method thereof |
| CN114769282A (en) * | 2022-04-07 | 2022-07-22 | 楚雄滇中有色金属有限责任公司 | Harmless treatment method for arsenic-precipitating slag of copper smelting waste acid |
| WO2022155832A1 (en) * | 2021-01-21 | 2022-07-28 | 中国科学院南京土壤研究所 | Remediation material for reducing cadmium bioavailability in soil and application thereof in passivation remediation for weakly alkaline soil |
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| CN111961474A (en) * | 2020-08-10 | 2020-11-20 | 山东达源环保工程有限公司 | Heavy metal dirt soil repairing agent and preparation method thereof |
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| CN114769282A (en) * | 2022-04-07 | 2022-07-22 | 楚雄滇中有色金属有限责任公司 | Harmless treatment method for arsenic-precipitating slag of copper smelting waste acid |
| CN114769282B (en) * | 2022-04-07 | 2023-10-27 | 楚雄滇中有色金属有限责任公司 | Harmless treatment method for copper smelting waste acid arsenic precipitation slag |
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