CN104907329A - Mining heavy metal polluted soil solidifying/stabilizing method - Google Patents
Mining heavy metal polluted soil solidifying/stabilizing method Download PDFInfo
- Publication number
- CN104907329A CN104907329A CN201510412337.8A CN201510412337A CN104907329A CN 104907329 A CN104907329 A CN 104907329A CN 201510412337 A CN201510412337 A CN 201510412337A CN 104907329 A CN104907329 A CN 104907329A
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- Prior art keywords
- heavy metal
- stabilizing
- curing agent
- apatite
- polluted 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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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a mining heavy metal polluted soil solidifying/stabilizing method, and relates to the technical field of mining heavy metal pollution treatment. The method employs coal ash and quick lime as curing agent, and employs apatite as stabilizer, wherein the apatite is firstly modified, and then the soil is solidified and stabilized through different solidifying/stabilizing formulations, thereby forming the optimal solidifying/stabilizing formulation. The curing agent and the stabilizer employed by the method are widely sourced with low cost, and certain parts of them are industrial wastes, therefore, a good economical benefit is provided by applying the industrial wastes into repairing the mining spoil area, and using the wastes for treating the pollution. The heavy metal leaching concentration of the processed solid is in accordance with the standard limit according to the express provisions of 'standard for pollution control on the landfill site of municipal solid waste'; and being analyzed from the microstructure characteristics, the processed substances are substances of low mobility and low solubility.
Description
Technical field
The present invention relates to heavy metals mining area pollutant abatement technology field, belong to heavy-metal contaminated soil and repair field, can protection of the environment effectively.
Background technology
Along with developing rapidly of China's mining industry, create a large amount of mine tailing waste residues.The process of these waste residues generally adopts the mode of Tailings Dam to stockpile with disposal, not only account for a large amount of soils, also by the contaminating action such as acidifying, rainfall eluviation soil, underground water and surface water.The build of Tailings Dam and maintenance need to drop into a large amount of funds in addition.
Heavy-metal contaminated soil for metal current mining area and surrounding area, the waste residue containing heavy metal and discarded object, conventional harmless treat is curing/stabilizing.Curing/stabilizing adds the physicochemical property that additive changes soil, its form existed in soil is changed by the absorption of heavy metal or co-precipitation, reduce the Leaching of heavy metal in soil environment, biological effectiveness and dissolving animal migration, reduce because rain or infiltration work the mischief to animals and plants.
Application number be 201310732102.8 Chinese invention patent disclose a kind of heavy metals immobilization agent and use the method for this heavy metals immobilization stabilisation heavy metal-polluted soil, this heavy metals immobilization agent is made up of curing agent A and curing agent B, in curing agent A, each constituent mass percentage is: flyash 40% ~ 80%, cement 5% ~ 20% and carbide slag 20% ~ 40%; Curing agent B is the sodium silicate of modulus 2.0.The curing agent solidification effect of this invention is good, and the heavy-metal contaminated soil leaching rate after solidification can reach the related request of " hazardous waste discriminating leaching characteristic identification " (GB5085.3-2007).
Summary of the invention
The present invention for raw material, prepares a kind of solidification/stabilizing agent for solidification and stabilization heavy metal pollution of soil with apatite, flyash and quick lime.Described apatite is modified with organic acids apatite; Described flyash is high-calcium fly ass, the raw material used is cheap, has both utilized a part of industry byproduct, with useless pollution treatment, the solidification effect of the curing agent simultaneously prepared is good, and the firming body leaching rate after process meets the prescribed limits in " household refuse landfill sites Environmental capacity standard ".
Described organic acid is preferably acetic acid and tartaric acid, is preferably tartaric acid.
The object of the present invention is to provide a kind of method of heavy metal polluted soil in mine field curing/stabilizing.
The present invention mainly process for process heavy metal be As, Pb, Zn, Cd, Cr.
The object of the invention is to be achieved through the following technical solutions:
First modification is carried out to apatite, by the tartaric acid of 0.4mol/L by liquid-solid ratio 20:1 and apatites mixed, be placed in after 7d cultivates in culturing room 28 DEG C and apatite is taken out.
Quick lime and flyash are as curing agent, and each component percentages of curing agent is: flyash 35% ~ 45%, quick lime 55% ~ 65%, and curing agent is 0.25 ~ 0.35 with heavy metal polluted soil in mine field ratio; Apatite, as stabilizing agent, accounts for 3% ~ 5% of heavy metal polluted soil in mine field weight.Each material adds in soil and all mixes.
The invention has the beneficial effects as follows:
The present invention adopts flyash, quick lime as curing agent, and apatite, as stabilizing agent, by different curing/stabilizing formulas, is cured stabilization processes to soil, forms the Optimization design of curing/stabilizing.Its stabilization effect is analyzed by danger wastes toxicity leaching experiment, microscopic sdIBM-2+2q.p.approach experiment (XRD, SEM), by processing mensuration, the comparative analysis of rear indices, to determine preferably stabilizing formulation, can prevent other unexpected bad feedbacks from occurring better.
Curing agent of the present invention, stabilizing agent source is relatively more extensive, cheap, and some is industrial waste, and it is applied in the reparation of mine waste residue field, with useless pollution treatment, has good economic benefit.The middle Leaching of Heavy Metals concentration of the firming body after process meets specified standard limit value in " household refuse landfill sites Environmental capacity standard ".
Accompanying drawing explanation
Fig. 1 is the XRD figure of mining soil before and after process, ◆ represent SiO
2; represents that K ▽ represents K; △ represents PbS; ◇ represents phosphoric acid lead salt; ● represent C-S-H; Zero represents Ca (OH)
2; ▽ represents (Fe, Mn)
2siO
4.
Fig. 2 is mining soil SEM figure (× 3000) before process
Fig. 3 is process Post RDBMS body SEM figure
Detailed description of the invention
Be convenient to for making technical scheme of the present invention understand, be described in further detail below in conjunction with the method for concrete test example to a kind of mining area polluted heavy metals contaminated soil curing/stabilizing process in the present invention, embodiment can not repeat one by one at this, but therefore embodiments of the present invention are not defined in following examples.
Embodiment 1
Heavy-metal contaminated soil takes from plumbous cadmia field, certain mining area, and heavy metal Pb content is 15167.63mg/kg, Zn content be 9481.93mg/kg, Cu content be 3273.62mg/kg, Cr content is 831.39mg/kg, the content of organic matter is 2.83g/kg.Curing/stabilizing material: quick lime, apatite are bought from market, flyash takes from Changsha coal-burning power plant.Most preferably be flyash 45% in curing agent in the present embodiment, quick lime 55%, curing agent is 0.35 with heavy metal polluted soil in mine field ratio, and apatite accounts for heavy metal polluted soil in mine field weight 5%.
Curing agent, stabilizing agent are mixed all with contaminated soil in mining areas, adds a certain amount of water by the ratio of mud 0.2, again stir, be placed in maintenance 28d under Indoor Natural condition.
" solid waste Leaching leaching method hac buffer method " (HJ/T300-2007) is adopted to carry out toxicity leaching to firming body, specified standard limit value during leaching concentration meets " household refuse landfill sites Environmental capacity standard ".
Toxicity leaches and the results are shown in Table 1, the leaching concentration (mg/L) in table before and after heavy-metal contaminated soil process
Said determination data illustrate, curing agent flyash, quick lime and stabilizing agent apatite be combined the leaching concentration that significantly can reduce contaminated soil in mining areas heavy metal.
Microscopic sdIBM-2+2q.p.approach is analyzed
As can be seen from Figure 1, crystalline substance main in former contaminated soil in mining areas is quartz phase and kaolinite (K) as material, and main component is SiO
2and aluminum silicate, after curing/stabilizing, in firming body, crystal mainly contains SiO mutually
2, C-S-H, ferrimanganic silicide, CaCO
3, Ca (OH)
2, PbS.Forming these materials is SiO in flyash
2, Al
2o
3and occur in activating oxide in quick lime and waste residue mixed process aquation send out should, generate Ca (OH)
2, hydrated calcium silicate gel (C-S-H), the material such as drated calcium aluminate, entringite and sulfide.After adding apatite, phosphate in apatite can with heavy metal element formed dissolubility very low, compound that stability is very high, to the heavy metal ion of divalence, there is efficient removal effect, and the alkaline environment of firming body colloidal dispersion is more stable, impel the generation of hydrated calcium silicate isocolloid further.Ca (OH)
2, heavy metal ion is wrapped in gel particle by effects such as absorption, precipitation, complexings by hydrated calcium silicate gel (C-S-H), the material such as calcium phosphate precipitation and heavy metallic mineral matter, forms the material of Hypomobility and low-solubility.
From Fig. 2, Fig. 3, before residue stabilization lenticular and bulk particle less and very little, and unordered in a jumble, therefore mobility of particle is large, not easily landfill.When after interpolation curing agent and stabilizing agent, present the crystalline lens and bulk particle that there are certain rule, and structure is closely knit, this is the surface morphology characteristics of C-S-H, carbonate and the phosphoric acid lead salt that hydration is formed.Heavy metal ion wraps up by these colloidal substances, forms stable colloidal dispersion in firming body, and heavy metal ion is difficult to leach.
Above-described embodiment is only preferred embodiment of the present invention, is not used for limiting practical range of the present invention.Namely all equalizations done according to content of the present invention change and modify, all by the claims in the present invention scope required for protection is contained.
Claims (5)
1. the method for heavy metal polluted soil in mine field curing/stabilizing process, it is characterized in that, the proportioning of curing agent and stabilizing agent: flyash and quick lime are as curing agent, each component percentages of curing agent is: flyash 35% ~ 45%, quick lime 55% ~ 65%, curing agent is 0.25 ~ 0.35 with heavy metal polluted soil in mine field ratio; Apatite, as stabilizing agent, accounts for 3% ~ 5% of heavy metal polluted soil in mine field weight.
2. stabilizing agent apatite according to claim 1, is characterized in that, modified with organic acids apatite, and described organic acid is acetic acid or tartaric acid.
3. organic acid according to claim 2, is characterized in that, described organic acid is tartaric acid.
4. curing agent flyash according to claim 1, is characterized in that, described flyash is high-calcium fly ass.
5. the method for heavy metal polluted soil in mine field curing/stabilizing according to claim 1 process, is characterized in that, the heavy metal of described heavy-metal contaminated soil is at least one in As, Pb, Zn, Cd and Cr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510412337.8A CN104907329A (en) | 2015-07-14 | 2015-07-14 | Mining heavy metal polluted soil solidifying/stabilizing method |
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| CN201510412337.8A CN104907329A (en) | 2015-07-14 | 2015-07-14 | Mining heavy metal polluted soil solidifying/stabilizing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107814544A (en) * | 2017-11-13 | 2018-03-20 | 东南大学 | A kind of curing agent and methods for making and using same for Compound Heavy Metals soil |
| CN109796982A (en) * | 2019-01-31 | 2019-05-24 | 河北工业大学 | A kind of soil remediation stabilizer and its preparation method and application prepared by high iron tailings |
| CN114158456A (en) * | 2021-11-26 | 2022-03-11 | 中冶南方都市环保工程技术股份有限公司 | Heavy metal mine side slope spray-seeding material and preparation method and application thereof |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104560046A (en) * | 2015-01-27 | 2015-04-29 | 上海绿强新材料有限公司 | Contaminated soil passivator and preparation method and application thereof |
| CN104726104A (en) * | 2015-03-27 | 2015-06-24 | 盱眙欧佰特粘土材料有限公司 | Preparation method of modification mineral composition for improving heavy metal polluted soil |
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2015
- 2015-07-14 CN CN201510412337.8A patent/CN104907329A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104560046A (en) * | 2015-01-27 | 2015-04-29 | 上海绿强新材料有限公司 | Contaminated soil passivator and preparation method and application thereof |
| CN104726104A (en) * | 2015-03-27 | 2015-06-24 | 盱眙欧佰特粘土材料有限公司 | Preparation method of modification mineral composition for improving heavy metal polluted soil |
Non-Patent Citations (3)
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| 丁振亮等: "改性天然磷灰石促进Pb /Zn 复合污染土壤的稳定化修复", 《环境化学》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107814544A (en) * | 2017-11-13 | 2018-03-20 | 东南大学 | A kind of curing agent and methods for making and using same for Compound Heavy Metals soil |
| CN109796982A (en) * | 2019-01-31 | 2019-05-24 | 河北工业大学 | A kind of soil remediation stabilizer and its preparation method and application prepared by high iron tailings |
| CN114158456A (en) * | 2021-11-26 | 2022-03-11 | 中冶南方都市环保工程技术股份有限公司 | Heavy metal mine side slope spray-seeding material and preparation method and application thereof |
| CN114158456B (en) * | 2021-11-26 | 2023-05-16 | 中冶南方都市环保工程技术股份有限公司 | Heavy metal mine slope spray seeding material and preparation method and application thereof |
| 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: 20150916 |
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