CN112170472A - A new technology for emergency remediation of heavy metal contaminated soil - Google Patents
A new technology for emergency remediation of heavy metal contaminated soil Download PDFInfo
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- CN112170472A CN112170472A CN201910588140.8A CN201910588140A CN112170472A CN 112170472 A CN112170472 A CN 112170472A CN 201910588140 A CN201910588140 A CN 201910588140A CN 112170472 A CN112170472 A CN 112170472A
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- soil
- heavy metal
- flotation
- sulfide
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- 239000002689 soil Substances 0.000 title claims abstract description 71
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 54
- 238000005067 remediation Methods 0.000 title claims abstract description 19
- 238000005516 engineering process Methods 0.000 title claims description 8
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 238000005188 flotation Methods 0.000 claims abstract description 24
- 239000006260 foam Substances 0.000 claims abstract description 14
- 239000004088 foaming agent Substances 0.000 claims abstract description 8
- 150000002500 ions Chemical class 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract description 3
- 238000005728 strengthening Methods 0.000 claims abstract 4
- 229910052793 cadmium Inorganic materials 0.000 claims abstract 2
- 229910052804 chromium Inorganic materials 0.000 claims abstract 2
- 229910052745 lead Inorganic materials 0.000 claims abstract 2
- 229910052753 mercury Inorganic materials 0.000 claims abstract 2
- 229910052759 nickel Inorganic materials 0.000 claims abstract 2
- 238000007873 sieving Methods 0.000 claims abstract 2
- 229910052725 zinc Inorganic materials 0.000 claims abstract 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 230000002000 scavenging effect Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000002101 nanobubble Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 7
- 239000003153 chemical reaction reagent Substances 0.000 claims 4
- 238000012216 screening Methods 0.000 claims 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims 2
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims 2
- 239000001099 ammonium carbonate Substances 0.000 claims 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims 1
- WVYWICLMDOOCFB-UHFFFAOYSA-N 4-methyl-2-pentanol Chemical compound CC(C)CC(C)O WVYWICLMDOOCFB-UHFFFAOYSA-N 0.000 claims 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims 1
- 239000004604 Blowing Agent Substances 0.000 claims 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 1
- 238000003723 Smelting Methods 0.000 claims 1
- WQHONKDTTOGZPR-UHFFFAOYSA-N [O-2].[O-2].[Mn+2].[Fe+2] Chemical compound [O-2].[O-2].[Mn+2].[Fe+2] WQHONKDTTOGZPR-UHFFFAOYSA-N 0.000 claims 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims 1
- 235000012501 ammonium carbonate Nutrition 0.000 claims 1
- 235000019270 ammonium chloride Nutrition 0.000 claims 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims 1
- 235000011130 ammonium sulphate Nutrition 0.000 claims 1
- CJDPJFRMHVXWPT-UHFFFAOYSA-N barium sulfide Chemical compound [S-2].[Ba+2] CJDPJFRMHVXWPT-UHFFFAOYSA-N 0.000 claims 1
- TUZCOAQWCRRVIP-UHFFFAOYSA-N butoxymethanedithioic acid Chemical compound CCCCOC(S)=S TUZCOAQWCRRVIP-UHFFFAOYSA-N 0.000 claims 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 claims 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims 1
- 235000019838 diammonium phosphate Nutrition 0.000 claims 1
- ZSFDBVJMDCMTBM-UHFFFAOYSA-N ethane-1,2-diamine;phosphoric acid Chemical compound NCCN.OP(O)(O)=O ZSFDBVJMDCMTBM-UHFFFAOYSA-N 0.000 claims 1
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims 1
- 235000019580 granularity Nutrition 0.000 claims 1
- 230000002209 hydrophobic effect Effects 0.000 claims 1
- 238000005342 ion exchange Methods 0.000 claims 1
- -1 ion sulfide Chemical class 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- KIACEOHPIRTHMI-UHFFFAOYSA-N o-propan-2-yl n-ethylcarbamothioate Chemical compound CCNC(=S)OC(C)C KIACEOHPIRTHMI-UHFFFAOYSA-N 0.000 claims 1
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 claims 1
- 239000004576 sand Substances 0.000 claims 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-N sodium polysulfide Chemical compound [Na+].S HYHCSLBZRBJJCH-UHFFFAOYSA-N 0.000 claims 1
- 238000010408 sweeping Methods 0.000 claims 1
- 238000004073 vulcanization Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 8
- 238000002386 leaching Methods 0.000 description 7
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 229910001431 copper ion Inorganic materials 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 2
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229910001453 nickel ion Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical group [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000003100 immobilizing effect Effects 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- YIBBMDDEXKBIAM-UHFFFAOYSA-M potassium;pentoxymethanedithioate Chemical compound [K+].CCCCCOC([S-])=S YIBBMDDEXKBIAM-UHFFFAOYSA-M 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000005837 radical ions Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
本发明是一种针对突发重金属污染事故时土壤中重金属离子快速脱除的应急处理方法，其特征在于：利用自制纳米气浮浮选装置脱除土壤重金属，取突发污染事件中重度重金属污染的土壤，经过两次湿筛，依次分离出粗颗粒和细颗粒的石子，筛下产物调浆，泥浆浓度控制在15%～55%之间，经过“一粗三精三扫”，泡沫产物为脱除的重金属产品，泡沫产品回收重金属，浮选装置排出物为修复后土壤，在流程合适的点分别加入硫化剂、强化硫化剂、捕收剂和起泡剂等，重污染土壤中重金属（Hg、Cd、Pb、Cr、Cu、Zn和Ni等）脱除率大于90%。本发明适宜重度污染土壤的快速修复，重金属脱除率高，能有效回收土壤中重金属。
The invention is an emergency treatment method for rapid removal of heavy metal ions in soil in the event of a sudden heavy metal pollution accident. After two wet sievings, the coarse and fine-grained stones are separated in turn, and the sieved products are slurried, and the slurry concentration is controlled between 15% and 55%. In order to remove heavy metal products, heavy metals are recovered from foam products, and the discharge from the flotation device is the soil after remediation. At appropriate points in the process, vulcanizing agents, strengthening vulcanizing agents, collectors and foaming agents are added respectively to prevent heavy metals in heavily polluted soil. (Hg, Cd, Pb, Cr, Cu, Zn and Ni, etc.) removal rate is greater than 90%. The invention is suitable for rapid restoration of heavily polluted soil, has high removal rate of heavy metals, and can effectively recover heavy metals in soil.
Description
Technical Field
The invention relates to an emergency air-floatation repair technology for heavy metal contaminated soil in the field of mineral processing engineering, which is particularly suitable for emergency repair treatment of heavy contaminated soil caused by sudden heavy metal leakage.
Background
Heavy metal pollution of soil has become one of the major environmental hazards worldwide. The emergency repair treatment method for the heavily polluted soil caused by sudden heavy metal leakage has less research. At present, the technology for removing heavy metals in soil at home and abroad mainly aims at the condition of light pollution degree, and can be roughly divided into three categories of physical remediation, chemical remediation and biological remediation from the remediation principle.
The physical restoration mainly comprises three methods of turning soil, replacing soil, soil dressing and the like, has the characteristics of rapidness, thoroughness and stability, but has larger engineering quantity and large investment. According to the relevant reports, the method has the advantage of 1 hm2The polluted soil in the area is subjected to engineering treatment (soil replacement), the cost of soil body per 1.0 m deep is up to $ 800-2400 ten thousand, and soil fertility is easy to weaken, so that the method is only suitable for a small-area polluted area at present.
The chemical remediation is that heavy metal ions react with coordination compounds to form stable complexes or react with acid radical ions to form precipitates, so that the existence form of the heavy metals in the soil is changed, the bioavailability and the mobility of the heavy metals in the soil are reduced, and the chemical remediation mainly comprises solidification/stabilization, leaching, an electrochemical method and a flotation method. Solidification/stabilization refers to the technique of mixing contaminated soil with a binder that can coalesce into a solid, capturing or immobilizing the contaminant in a solid structure. The soil leaching method is a method for transferring heavy metal pollutants in soil to a liquid phase by using a leaching agent and then treating the generated waste liquid. Electrochemical remediation of soil refers to a technique for in situ remediation of contaminated soil by placing suitable anodes and cathodes vertically underground and applying a low power dc electric field to remove inorganic or organic contaminants from the soil. The bioremediation technology is to utilize certain specific animals, plants and microorganisms to enable the specific animals, plants and microorganisms to absorb or degrade heavy metal pollutants in soil quickly so as to achieve the aim of purifying the soil.
The flotation method is initially applied to separation of useful minerals and gangue, and as early as 1860, Willianm Hayneo applies for the flotation method, which is one of the most important methods for mineral separation, and has more research reports on treatment of wastewater containing heavy metals and less reports on application of the flotation method to heavy metal contaminated soil. The Sunweishi application of a foam flotation method to separate heavy metal in soil, sodium dodecyl sulfate (SDS, 6 mg/g) is used as a foaming agent, potassium amyl xanthate (1 mg/g) or kerosene (15 mg/g) is used as a collecting agent, and when the concentration of sodium sulfide is 3 times that of the heavy metal in the soil, the removal rate of the heavy metal reaches 80%, which indicates that the foam flotation method can effectively remove the heavy metal ions in the soil.
At present, the heavy metal contaminated soil treatment methods mainly aim at the condition of light pollution degree, and have the following defects:
(1) the physical method has large energy consumption and large investment, thereby limiting the application range of the method.
(2) The biological method has long repair period and cannot be used for emergency pollution events.
(3) The chemical method has short restoration time, high efficiency, easy generation of secondary pollution and poor removal effect on heavy metals adsorbed on the surface of the soil.
Disclosure of Invention
At present, emergency repair treatment methods for severely polluted soil caused by sudden heavy metal leakage are few. The conventional methods such as physical remediation, chemical remediation and biological remediation have respective defects and are not suitable for remediation of contaminated soil in sudden pollution events. Therefore, the novel emergency remediation technology for the heavy metal contaminated soil provided by the invention can treat about 0.5-10 tons of soil per hour, is particularly suitable for emergency remediation treatment of the heavily contaminated soil caused by sudden heavy metal leakage, simultaneously recovers the heavy metals in the soil, realizes resource utilization, has the advantages of high treatment efficiency, high treatment speed, capability of simultaneously remedying various heavy metals and the like, does not need to carry the soil for the second time, removes the soil with the heavy metals, stacks the soil in situ after dehydration, and settles and exposes the filtered water to reach the surface water discharge standard.
Drawings
The attached figure 1 is a process flow chart of emergency repair treatment of heavily polluted soil caused by sudden heavy metal leakage, and the process scheme of the invention is explained by combining the process flow chart: an excavator or other similar mechanical equipment feeds polluted soil into a small buffer bin, the polluted soil is washed by a rough screen to separate coarse-particle stones, products under the rough screen enter a fine screen, products on the fine screen are fine-particle stones, products under the fine screen enter a stirring barrel to be subjected to size mixing, a vulcanizing agent, a reinforced vulcanizing agent, a collecting agent, a foaming agent and the like are added, rough-selection foam products enter primary fine selection, rough-selection underflow enters primary scavenging, primary fine-selection foam enters secondary fine selection, secondary fine-selection foam enters third fine selection, third fine-selection underflow flows back to secondary fine selection, secondary fine-selection underflow flows back to primary fine selection, primary fine-selection underflow flows back to rough selection, underflow of primary scavenging flows to secondary scavenging, underflow of secondary scavenging flows into third scavenging, and foam products return sequentially.
Fig. 2 and 3 show a nanobubble flotation device of the present invention, and the structure and the operation principle of the device are described as follows: 3-6 slurry feeding ports are arranged from the bottom surface of the column bottom of the flotation column to 1/3 parts of the cylinder, the top is a foam product overflow port, a foam product groove, the bottom is a mine discharge port, and the flotation column can be connected with the next flotation device to realize series connection. The water pump inhales gas, liquid and solid mixing arrangement with mud, then mud gets into column separator through nanometer air supporting generator, and the nanometer bubble carries adhesion heavy metal sulphide granule to get into the foam product, separates out the heavy metal through scraping the bubble, and the soil after the restoration is stayed in the air supporting device, can change the volume of heavy metal contaminated soil as required, designs the nanometer air supporting device of different models.
Detailed Description
The first embodiment is as follows: a liquid return pipe of an electrolytic tank in an electrolytic workshop of a certain copper industry Limited liability company bursts, electrolyte leaks, and workers directly wash and discharge the copper-containing waste liquid out of a factory, so that soil around the factory is polluted, and the Cu content in the polluted soil is up to 15000 mg/kg. By adopting a self-made nanometer bubble flotation device and through 'one-rough three-fine three-sweep', the consumption of the vulcanizing agent is 3 times of a theoretical value, the concentration of the strengthened vulcanizing agent is 20 mg/L, the concentration of the collecting agent is 60 mg/L, the concentration of the foaming agent is 30 mg/L, the content of copper ions in the restored soil is reduced to 1325 mg/kg, and the removal rate of the copper ions reaches 91.17%.
Example two: in the heap leaching of certain nickel oxide ore, dilute sulfuric acid is adopted for leaching, a dam body of a pregnant solution pool collapses, so that pregnant solution leaks to pollute soil around the pregnant solution pool, and the Ni content in the polluted soil is up to 30000 mg/kg. By adopting a self-made nanometer bubble flotation device and through 'one-rough three-fine three-sweep', the consumption of the vulcanizing agent is 3.5 times of the theoretical value, the concentration of the reinforced vulcanizing agent is 30 mg/L, the concentration of the collecting agent is 80 mg/L, the concentration of the foaming agent is 30 mg/L, the content of nickel ions in the restored soil is reduced to 1405 mg/kg, and the removal rate of the nickel ions reaches 95.32%.
Example three: in the microbial heap leaching of certain secondary copper sulfide ore, as the dam body of the microbial leaching liquid pool collapses due to rain washing, the pregnant solution leaks, the soil around the pregnant solution pool is polluted, and the Cu content in the polluted soil is up to 10000 mg/kg. By adopting a self-made nanometer bubble flotation device and through 'one-rough three-fine three-sweep', the consumption of the vulcanizing agent is 2.5 times of the theoretical value, the concentration of the reinforced vulcanizing agent is 15 mg/L, the concentration of the collecting agent is 50 mg/L, the concentration of the foaming agent is 30 mg/L, the content of copper ions in the restored soil is reduced to 925 mg/kg, and the removal rate of the copper ions reaches 90.75%.
Claims (2)
1. A new technology for emergency remediation of heavy metal contaminated soil is characterized by comprising the following steps:
(1) wet sieving and separating stones: the method adopts twice screening to sequentially separate stones with different granularities, the equipment for coarse screening can select one or more of a vibrating screen, a cylindrical screen, a rotary screen, a shaking screen, a grid screen and the like, and the equipment for fine screening can select a fine screen, a sand washer and the like.
(2) Soil size mixing: according to the content of heavy metal ions in the soil and the degree of argillization, the concentration of the slurry is controlled to be between 10 and 55 percent.
(3) Removing heavy metal by nano air flotation: after size mixing, through 'one-coarse three-fine three-sweep', foam products are removed heavy metal products, the discharge of a flotation device is restored soil, and the removal rate of heavy metals (Hg, Cd, Pb, Cr, Cu, Zn, Ni and the like) in the heavily polluted soil is more than 90%.
(4) Flotation reagent: the flotation reagents comprise vulcanizing agents, strengthening vulcanizing agents, collecting agents, foaming agents and the like, 4 types of reagents are added in rough concentration, the vulcanizing agents and the collecting agents are added in scavenging, and no reagent can be added in a concentration stage.
(5) And (3) recovering heavy metals: the foam product has high heavy metal content, and the metal elements in the foam product can be recovered by a chemical method or sold to a smelting plant, so that the comprehensive utilization of resources is realized.
2. The novel technology for emergency remediation of heavy metal contaminated soil according to claim 1, characterized in that:
(1) self-control nanometer air supporting device: utilize self-control novel controllable nanometer bubble flotation device to be reactor (application number 201811081629.8), its characterized in that, the water pump inhales gas, liquid and solid mixing arrangement with mud, then mud gets into column separator through nanometer air supporting generator, the nanometer bubble carries adhesion heavy metal sulphide granule to get into the foam product, through scraping the bubble and separate out the heavy metal, soil after the restoration is stayed in the air supporting device (see figure 2), can revise the volume of heavy metal soil as required, design the nanometer air supporting device of different models.
(2) The heavy metal removing agent comprises: the vulcanizing agents comprise calcium sulfide, sodium sulfide, barium sulfide, potassium sulfide, sodium hydrosulfide, sodium polysulfide and the like, and the dosage of the vulcanizing agents is 1.5-6 times of the theoretical dosage; the strengthening vulcanizing agent comprises ammonium sulfate, ammonium chloride, ethylenediamine phosphate, ammonium bicarbonate, ammonium nitrate, ammonium carbonate, diammonium hydrogen phosphate and the like, and the concentration of the strengthening vulcanizing agent is 10 mg/L-1000 mg/L; the collecting agent comprises ethyl xanthate, butyl xanthate, Z-200, Sodium Dodecyl Sulfate (SDS), Sodium Dodecyl Benzene Sulfonate (SDBS) and Cetyl Trimethyl Ammonium Bromide (CTAB), and the concentration of the collecting agent is 30 mg/L-1000 mg/L; the blowing agent comprises 2#Oil, MIBC and 11#The foaming agent concentration is 10 mg/L to 500 mg/L.
(3) The nano air flotation process structure: the flow of 'one coarse and three fine sweeping' is adopted, and the flotation time is determined according to the flotation time of the self-made nano bubble flotation device.
(4) After the heavy metal ions are converted into sulfide particles, heavy metal ion sulfide particles and soil need to be separated through an air floatation method, so that the heavy metal contaminated soil is repaired. Heavy metal ions in the soil exist in a water-soluble state, an ion exchange state, a carbonate combination state, an iron-manganese oxide combination state, an organic combination state, a sulfide combination state, a residual state and the like, after the vulcanization pretreatment, the particle size of the formed hydrophobic sulfide particles is small, some particles even reach the nanometer level, bubbles matched and coordinated with the nanometer level sulfide particles are formed, and the key for efficiently separating the sulfide particles from the soil is that. Therefore, the nano-bubble flotation equipment is developed into key equipment for repairing heavy metal contaminated soil by a vulcanization-air floatation method (application number 201811081629.8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910588140.8A CN112170472A (en) | 2019-07-02 | 2019-07-02 | A new technology for emergency remediation of heavy metal contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910588140.8A CN112170472A (en) | 2019-07-02 | 2019-07-02 | A new technology for emergency remediation of heavy metal contaminated soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112170472A true CN112170472A (en) | 2021-01-05 |
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| CN201910588140.8A Pending CN112170472A (en) | 2019-07-02 | 2019-07-02 | A new technology for emergency remediation of heavy metal contaminated soil |
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