CN115521787A - Lead-zinc smelting site heavy metal compound contaminated soil remediation agent and application thereof - Google Patents
Lead-zinc smelting site heavy metal compound contaminated soil remediation agent and application thereof Download PDFInfo
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- CN115521787A CN115521787A CN202211264612.2A CN202211264612A CN115521787A CN 115521787 A CN115521787 A CN 115521787A CN 202211264612 A CN202211264612 A CN 202211264612A CN 115521787 A CN115521787 A CN 115521787A
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- 239000002689 soil Substances 0.000 title claims abstract description 81
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 64
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- 238000005067 remediation Methods 0.000 title claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 19
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 150000002736 metal compounds Chemical class 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 21
- 230000000694 effects Effects 0.000 claims abstract description 17
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 14
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002910 solid waste Substances 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 8
- 239000011701 zinc Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000008439 repair process Effects 0.000 claims description 6
- 239000011133 lead Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 3
- 229910001297 Zn alloy Inorganic materials 0.000 claims 1
- 238000002386 leaching Methods 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 16
- 231100000419 toxicity Toxicity 0.000 abstract description 15
- 230000001988 toxicity Effects 0.000 abstract description 15
- 238000011282 treatment Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 8
- 238000002161 passivation Methods 0.000 abstract description 4
- 239000004568 cement Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 230000006641 stabilisation Effects 0.000 description 7
- 238000011105 stabilization Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- KIZFHUJKFSNWKO-UHFFFAOYSA-M calcium monohydroxide Chemical compound [Ca]O KIZFHUJKFSNWKO-UHFFFAOYSA-M 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 3
- 239000002440 industrial waste Substances 0.000 description 3
- 239000002905 metal composite material Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 238000004811 liquid chromatography Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- -1 magnesium modified montmorillonite Chemical class 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000000159 protein binding assay Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C09K2109/00—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE pH regulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The heavy metal compound contaminated soil remediation agent for the lead-zinc smelting site consists of a high-activity alkaline material and solid waste, wherein the high-activity alkaline material is magnesium oxide, the solid waste is at least one of blast furnace slag powder and red mud, the high-activity alkaline material accounts for 40-50 parts, and the solid waste accounts for 50-60 parts. By applying the method, the leaching toxicity of the heavy metals in the composite contaminated soil of the lead-zinc smelting site is reduced, the leaching toxicity index of the treated soil meets the relevant standard, and the passivation rate of the heavy metals such as lead, cadmium, copper and zinc in the soil can reach over 86.8 percent. The method has the advantages of easily obtained treatment materials, convenient and fast use process, rapidness, effectiveness, lower cost of the whole remediation process and strong practicability, and is an ideal remediation means for heavy metal contaminated soil, especially high-concentration heavy metal contaminated site soil. Therefore, the method provides a good demonstration for the remediation of the soil in the heavy metal contaminated site.
Description
Technical Field
The invention belongs to the technical field of soil pollution remediation, and particularly relates to a heavy metal compound contaminated soil remediation agent for a lead-zinc smelting site and application thereof.
Background
With the rapid improvement of the industrial development level in China, the production amount of solid wastes in China is greatly increased. According to statistics, the generation amount of general industrial solid wastes generated in 200 large and medium cities in 2018 is 15.5 hundred million tons, the generation amount of industrial hazardous wastes is 4643.0 million tons, and the standard exceeding rate of heavy metals in soil for industrial and mining enterprises in China exceeds 30%. Most of solid wastes subjected to open-air stockpiling not only encroach on a large amount of cultivated land resources, but also change the form of heavy metals in soil along with the passage of time under natural conditions, and the migration of the heavy metals poses serious threats and challenges to surrounding water bodies, regional ecological environment, healthy human living environment, economic sustainable development and even social stability. In recent years, the development speed of various heavy metal contaminated soil technologies is high. The leaching method is easy to cause secondary pollution, the leaching solution needs to be treated again, the liquid consumption is large, and the required cost is high. The soil solidification/stabilization (S/S) technology is a remediation technology that reduces the toxic degree of heavy metals by fixing toxic heavy metals in soil by physical or chemical methods, or converting heavy metals into chemically inactive forms to prevent the heavy metals from migrating or diffusing in the environment. The soil remediation technology has the advantages of short implementation period, strong standard-reaching capability, wide applicability and the like, quickly becomes one of the leading technologies for remediation of heavy metal contaminated soil, and is also the most main remediation technology for the US super-fund contaminated site.
Curing and stabilization differ in their principles of operation and characteristics of action, but in practice are often used in combination as two closely related processes. The soil solidification/stabilization technology can realize the cooperative repair of high-concentration and various heavy metals and ensure that the leaching concentration of the heavy metals is maintained within an acceptable range. The heavy metal contaminated soil after curing/stabilizing treatment can be sealed or isolated in situ and used as roadbed, backfill of construction land, greening soil and the like.
In recent years, various materials for immobilizing/stabilizing heavy metals have been invented. The invention CN104804747A of China restores the polluted soil of lead-zinc mine area by using the calcium-containing base dust generated in the rotary kiln process. The invention CN113248195A in China discloses a heavy metal curing and repairing material in a metal sulfide mine acidic mining side slope, which mainly contains cement, calcium oxide, water-absorbent resin, chelating agent and the like, and can modify the acidic side slope, cure heavy metals and realize the ecological repair of the side slope. The sulfur content of the heavy metal contaminated soil in the mining area is high, the acid return phenomenon is easy to occur along with the time, and the acid resistance of the cement enables the heavy metal solidified by the cement to be dissolved out again in an acid environment.
The invention CN114538839A in China discloses a municipal solid waste incineration fly ash heavy metal curing material based on nano alumina and a preparation method thereof, wherein the alumina used in the patent is in the 10nm level, and the leaching rate of heavy metal ions is obviously reduced. The preparation process of the nano alumina is complex and the cost is high. According to the invention CN111234827A, the precipitate obtained by fully reacting glucose, basic magnesium carbonate and montmorillonite at 60-70 ℃ is calcined to obtain magnesium modified montmorillonite, and the magnesium modified montmorillonite is mixed with biochar to be used as a heavy metal composite contaminated soil remediation agent.
Aiming at the current situations that the concentration of heavy metal pollution in the soil of a smelting site is extremely high and multiple heavy metals coexist, the development of a soil solidification/stabilization repairing agent which is convenient to use, efficient and wide in applicability is urgently needed.
Disclosure of Invention
The technical problem to be solved is as follows: in order to solve the defects of the existing repairing material and realize the effective solidification/stabilization of various heavy metals in the contaminated soil of a smelting site, the repairing agent and the application thereof for the heavy metal compound contaminated soil of the lead-zinc smelting site are provided. The high-activity metal oxide is combined with the industrial waste residue, and the migration of heavy metals in the field soil is conveniently and rapidly reduced through mechanisms such as chemical precipitation, coprecipitation and the like, so that the waste is treated by waste, and the comprehensive utilization idea of the industrial waste residue is widened.
The technical scheme is as follows: the heavy metal composite polluted soil remediation agent for the lead-zinc smelting site consists of a high-activity alkaline material and solid waste, wherein the high-activity alkaline material is magnesium oxide, the solid waste is at least one of blast furnace slag powder and red mud, the high-activity alkaline material accounts for 40-50 parts, and the solid waste accounts for 50-60 parts.
Preferably, the highly active alkaline material in the repairing agent accounts for 40-50 wt.%, the blast furnace slag powder accounts for 30-50 wt.%, and the red mud accounts for 0-30wt.%.
Preferably, the highly active basic material is 150-mesh magnesium oxide.
Preferably, the solid waste is S95-grade blast furnace slag powder which passes through 400-600 meshes, or red mud which passes through 200 meshes.
The repairing agent is applied to repairing heavy metal composite polluted soil in a lead-zinc smelting site.
The specific application scheme is as follows: the repairing agent and the polluted soil are stirred according to the mass ratio of 1 (19-9), fully and uniformly mixed, and the water content of the soil is kept within the range of 10% -25%.
The polluted soil is high-concentration heavy metal copper, zinc, lead and cadmium composite polluted soil in a lead-zinc smelting site, and is obtained by sieving the soil with a 2mm sieve.
The pH value of the polluted soil is 8.03-8.92.
The repairing time is 7-49 days.
Has the advantages that: compared with the prior solidification/stabilization treatment technology, the high-efficiency accelerant high-activity magnesium oxide (amorphous powder, 150 magnesium oxide) provided by the invention is used for the high-concentration heavy metal zinc, lead, copper and cadmium composite polluted alkaline soil in a smelting site in cooperation with industrial wastes such as blast furnace slag powder (S95-grade mineral powder, high-fineness and high-activity powder), red mud and the like, and the leaching concentration measured by adopting a TCLP method is in accordance with the standard after the solidification for 7-49 days. The curing treatment process is simple and convenient to operate, the materials are easy to obtain, the effect is quick, the purpose of treating wastes with processes of wastes against one another is realized, and the market prospect is very wide.
Detailed Description
The following binding assays further illustrate the invention:
example 1
The soil used in the test is collected from surface soil 1 polluted by high-concentration heavy metals in a lead-zinc smelting field in a certain city in Henan, the content of zinc (5811 mg/kg), lead (55440 mg/kg), cadmium (411 mg/kg) and copper (3572 mg/kg) is high, and particularly, the pollution caused by lead and cadmium is extremely serious and exceeds the risk control value of the second-class land of the soil of the construction land in China (GB 36600-2018, lead is 2500mg/kg and cadmium is 172 mg/kg). Collecting surface soil of excavation site, if there is large soil block, breaking with mallet, and sieving with 2.0mm sieve. All the soil sieved by the 2.0mm sieve is gathered together and stirred uniformly for later use.
9.0g of contaminated soil was weighed and 1.0g of remediation material was added. The curing repair material treatment comprises the following steps: 1. cement; 2. 1, mixing the blast furnace slag powder and hydroxyapatite in a mass ratio of 1; 3. the mass ratio of the steel slag/calcium hydroxide mixture is 1; 4. and the mass ratio of the red mud to the blast furnace slag powder to the active magnesium oxide is 3. And (3) uniformly mixing the soil and the repair materials in a container, adding water, keeping the water content of 10%, and curing and stabilizing in a room for 17 days for sampling. The samples were air dried and ground through a 2.0mm mesh screen. And (3) determining the leaching toxicity of the heavy metal in the repaired soil by adopting a TCLP (thermal chemical liquid chromatography) method, and determining the leaching solution by using an inductively coupled plasma atomic emission spectrometer (ZX-2018) (ICP-OES). The results are shown in Table 1.
TABLE 1 EXAMPLE 1 test soil samples TCLP Leaching heavy metals content (mg/L)
As can be seen from the table, the leaching toxicity of four heavy metals in contrast soil exceeds the international standard value, the leaching toxicity of copper and zinc in all curing and repairing processes reaches the standard, wherein the leaching toxicity of lead and cadmium in the soil treated by cement, blast furnace slag powder/hydroxyapatite and steel slag/calcium hydroxide exceeds the standard, and the leaching toxicity of lead and cadmium in the soil treated by red mud/blast furnace slag powder/active magnesium oxide composite process reaches the standard, which indicates that the curing and stabilizing effect of the repairing agent is superior to that of the traditional cement, blast furnace slag powder/hydroxyapatite and steel slag/calcium hydroxide treatment.
Meanwhile, the soil pH after the culture is measured by adopting the ratio of 1 to 2.5, the soil heavy metal solidification rate is calculated according to the leaching toxicity condition of the soil heavy metal before and after the remediation, and the results are listed in Table 2.
Table 2 passivation rate of heavy metals and pH change of soil sample under the conditions of example 1
As can be seen from the table, the pH of the control soil was 8.03, and the pH of the cement, steel slag/calcium hydroxide treatment and red mud/blast furnace slag powder/active magnesium oxide composite treatment increased by 1.49-1.83 units. Compared with other three curing repair materials, the passivation rate of the red mud/blast furnace slag powder/active magnesium oxide composite treatment is highest, and even under the condition of high-concentration composite pollution of heavy metals in the soil of a smelting site, the passivation rate of four heavy metals of copper, zinc, lead and cadmium reaches 86.8% -100%.
Example 2
The test site and the soil are from the same smelting site in example 1, but the sampling positions are slightly different, so that the heavy metal contents are different. The pH of soil sample 2 was 8.92 and the pH of soil 3 was 8.70. The sample analysis was performed as in example 1. The heavy metal content in soil samples 2 and 3 is shown in table 3. 60.0g of a mixture of soil over 10 mesh and cured remediation material was weighed into a culture vessel, with the cured remediation material used in amounts of 5% and 10%. Water was added to maintain the water content at 15%. Soil samples were collected after 7 days. The samples were air dried and ground through a 2.0mm mesh screen. And (3) determining the leaching toxicity of the heavy metal in the repaired soil by adopting a TCLP (thermal chemical liquid chromatography) method, and determining the leaching solution by using an inductively coupled plasma atomic emission spectrometer (ZX-2018) (ICP-OES). The results are shown in Table 4.
As can be seen from Table 3, the soil of the two lead-zinc smelting sites is in combined pollution of copper, zinc, lead and cadmium, the lead content is high, and the cadmium content of the soil sample 2 is also high.
Table 3 example 2 heavy metal content of test soil sample 2 and test soil sample 3
As can be seen from Table 4, after 7 days of curing and stabilization, the leaching toxicity of the soil sample 2 in example 2 is high compared with that of lead and cadmium, is reduced after the cement treatment but still higher than the standard value, and the leaching toxicity of the four heavy metal elements is significantly reduced and lower than the standard value after the combination treatment of the high-activity magnesium oxide/blast furnace slag powder. The heavy metal solidification rate is reduced from 48-72% of cement treatment to 94.3-99.7% of high-activity magnesium oxide/blast furnace slag powder combined treatment.
Similarly, in example 3, the leaching toxicity of the soil sample 3 compared with heavy metals of lead, cadmium and copper exceeds the international standard value. The leaching toxicity after the cement treatment is reduced, but still higher than the standard value, and the heavy metal curing rate of the cement treatment is 40-72.4%. After the high-activity magnesium oxide/blast furnace slag powder is subjected to combined treatment, the leaching toxicity of the four heavy metal elements is greatly reduced and is lower than a standard value, and the heavy metal curing rate reaches 90.9-99.8%.
TABLE 4 test soil samples TCLP leach toxicity and heavy metal cure rate conditions in example 2
Claims (9)
1. The heavy metal compound contaminated soil remediation agent for the lead-zinc smelting site is characterized by comprising a high-activity alkaline material and solid waste, wherein the high-activity alkaline material is magnesium oxide, the solid waste is at least one of blast furnace slag powder and red mud, the high-activity alkaline material accounts for 40-50 parts, and the solid waste accounts for 50-60 parts.
2. The lead-zinc smelting site heavy metal compound contaminated soil remediation agent of claim 1, wherein the highly active alkaline material is 40-50 wt.%, the blast furnace slag powder is 30-50 wt.%, and the red mud is 0-30wt.%.
3. The agent for remediating lead-zinc smelting site heavy metal contaminated soil according to claim 1, wherein the high-activity alkaline material is 150-mesh magnesium oxide.
4. The agent for remediating lead-zinc smelting site heavy metal combined contaminated soil as recited in claim 1, wherein the solid waste is 400-600 mesh S95-grade blast furnace slag powder, or 200 mesh red mud.
5. The application of the repairing agent of any one of claims 1 to 4 in repairing lead-zinc smelting site heavy metal combined contaminated soil.
6. The application of the repairing agent as claimed in claim 5, wherein the repairing agent and the contaminated soil are stirred according to the mass ratio of 1 (19-9), and are fully and uniformly mixed, so that the water content of the soil is kept within the range of 10% -25%.
7. The application of the lead-zinc alloy as claimed in claim 5, wherein the polluted soil is high-concentration heavy metal copper, zinc, lead and cadmium composite polluted soil in a lead-zinc smelting site, and is obtained by sieving the soil with a 2mm sieve.
8. Use according to claim 5, wherein the contaminated soil has a pH in the range of from 8.03 to 8.92.
9. Use according to claim 5, wherein the repair time is 7-49 days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211264612.2A CN115521787A (en) | 2022-10-17 | 2022-10-17 | Lead-zinc smelting site heavy metal compound contaminated soil remediation agent and application thereof |
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| CN202211264612.2A CN115521787A (en) | 2022-10-17 | 2022-10-17 | Lead-zinc smelting site heavy metal compound contaminated soil remediation agent and application thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009155414A (en) * | 2007-12-26 | 2009-07-16 | Taiheiyo Cement Corp | Insolubilizing material and insolubilizing process |
| CN102071029A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Green low-carbon curing agent for soil curing |
| CN105499262A (en) * | 2016-01-22 | 2016-04-20 | 户园凌 | Alkaline chromium-contaminated soil solidifying, stabilizing and repairing method |
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| CN112920807A (en) * | 2021-02-03 | 2021-06-08 | 清华大学 | Heavy metal contaminated soil remediation material, preparation method thereof and remediation method of heavy metal contaminated soil |
| CN114644929A (en) * | 2020-12-17 | 2022-06-21 | 湖北工业大学 | Novel composite curing agent for heavy metal Cd-polluted soil and use method thereof |
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| CN106811201A (en) * | 2017-01-24 | 2017-06-09 | 东南大学 | A kind of magnesium oxide-based curing agent and its application process |
| CN106866052A (en) * | 2017-02-07 | 2017-06-20 | 郑州大学 | A kind of red mud slag geo-polymer and preparation method thereof |
| CN107057705A (en) * | 2017-05-27 | 2017-08-18 | 南京大学（苏州）高新技术研究院 | A kind of heavy-metal contaminated soil repair materials, preparation method and purposes |
| CN114644929A (en) * | 2020-12-17 | 2022-06-21 | 湖北工业大学 | Novel composite curing agent for heavy metal Cd-polluted soil and use method thereof |
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