CN104479686A - Curing agent and method for heavy metal - Google Patents
Curing agent and method for heavy metal Download PDFInfo
- Publication number
- CN104479686A CN104479686A CN201410745013.1A CN201410745013A CN104479686A CN 104479686 A CN104479686 A CN 104479686A CN 201410745013 A CN201410745013 A CN 201410745013A CN 104479686 A CN104479686 A CN 104479686A
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- heavy metals
- peat
- lime
- soil
- flyash
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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
- 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 discloses a curing agent and method for heavy metal and particularly discloses a curing agent for heavy metal in polluted soil. The curing agent is characterized by comprising the three components in percentage by weight: 30-40% of pulverized fuel ash, 35-51% of lime and 19-35% of peat. When the curing agent is used for treating the polluted soil, the curing method comprises the steps of sufficiently mixing the curing agent and heavy metal polluted soil according to the ratio of 1:10 (weight ratio); then, adding water accounting for 40% (weight ratio) of the mixture; and then, sufficiently stirring and mixing. The curing agent for heavy metal in polluted soil, disclosed by the invention, is prepared by taking natural minerals as raw materials, so that no secondary pollution is caused, the soil fertilizer efficiency can be effectively improved while the heavy metal is cured, and the technical problems that the pH value of the soil is remarkably changed and the soil is hardened in the existing chemical remediation method are solved.
Description
Technical field
The invention belongs to field of environment engineering technology, particularly relate to a kind of heavy metals immobilization agent and using method.
Background technology
Heavy metal generally refers to the about 45 kind elements of proportion at more than 5.0g/cm3.A huge sum of money in Study on environmental pollution
Owner will refer to the significant element of bio-toxicity such as Pb, Cd, Hg, Cr and metalloid As, also comprises the element such as heavy metal Zn, Cu, Co, Ni and Sn with certain toxicity.The cadmium rice event of domestic priority generation, caused party and state to show great attention in recent years.On February 18th, 2011, " heavy metal contamination integrated control " 12 " planning " obtains State Council and formally gives an written reply, become first granted " 12 " planning, according to this planning requirement, following 5 years, the special fund that state revenue will drop into about 75,000,000,000 yuan, integrated control heavy metal contamination.
Heavy metal pollution of soil refers to that heavy metal inputs in soil by mankind's activity, causes heavy metal content in soil apparently higher than background content, and the phenomenon causing eco-environmental quality to worsen.Current heavy-metal contaminated soil restorative procedure mainly contains following several:
First is visitor's (changing) local method: change new uncontamination soil after partly or entirely being removed by table soil, or in contaminated soil Surface mulch uncontamination soil or mixing, make the contact of Pollutant levels reduction or decreasing pollution thing and root system of plant, reach the object alleviating harm.This methods engineering amount is large, investment cost is high, destructible soil structures, and the dirt soil swapped out need be dealt carefully with, and is not suitable for the improvement of pollution in wide area soil.
Second is Electroremediation: plug electrode at contaminated soil two ends, after switching on power, charged particle in soil moves on the different electrode of polarity, then to be collected by electrode by engineering measure and processes, to reach the object removing Heavy Metals in Contaminated Soils.Galvanic action distance is too little because actual contaminated soil area is generally comparatively large for this method, be therefore difficult to promote, and running cost is too high.
3rd is phytoremediation: absorb heavy metal in soil mainly through super enriching plant, heavy metal is transferred to plant
Over-ground part, then gathers in the aboveground vegetation part of enriching heavy metal, reclaims heavy metal after burning, reaches the order repaired and pollute
.This method affects comparatively large by envrionment conditions and disease and pest, and is subject to the restriction of plant growing and growth, and the cycle is longer, repairs
Efficiency is lower.
4th is chemical leaching method: adopt specific chemical reagent to be leached out by the heavy metal in contaminated soil, then
The waste liquid leached out is processed.This method cost is higher, and enters soil for the chemical reagent of washed off soil and easily cause secondary pollution.
5th is solidification and stabilization: general solidifying agent and the Heavy Metals in Contaminated Soils of adopting reacts, and generates stable material, thus reduces the Leaching of heavy metal, reach reparation object.
At present, solidification treatment administers one of wider technology of heavy metal pollution of soil application both at home and abroad.Research comparative maturity is lime, flyash fixing Pb, Cr, Cu, Zn.But for Pb, As combined pollution, also there is no effective administering method.Because be conducive to the fixing of Pb in higher pH situation, but be unfavorable for that As's is fixing, otherwise what in lower pH situation, be conducive to As is fixedly unfavorable for that Pb's is fixing; Pb easily leaches at a low ph.Therefore, prepare that suitable solidifying agent, solidification effect are good, non-secondary pollution, cheap heavy metals immobilization agent become the gordian technique that heavy-metal contaminated soil is repaired, explore and prepare heavy metals immobilization agent with natural mineral or waste for starting material and become the important research direction that heavy-metal contaminated soil repairs.
Summary of the invention
1, the technical problem to be solved in the present invention overcomes the deficiencies in the prior art, organic curing agent and inorganic solidification agent combinationally used, and enables to reach to Pb, As two heavy metal species object of solidifying simultaneously.And the collaborative effect strengthening heavy metals immobilization between component, the heavy metal-polluted soil Leaching leaching yield after solidification can reach " the related request of Hazardous wastes judging standard leaching characteristic identification (GB5085.3-2007).
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of heavy metals immobilization agent and curing thereof, and by weight percentage, described solidifying agent is grouped into by following three kinds of one-tenth: flyash 30%-40%, lime 35%-51%, peat 19%-35%.
Preferably, described dye heavy metal-polluted soil solidifying agent adds the flyash of 30%, the lime of 35%, the peat of 35%; Or 40% flyash, 40% lime, 20% peat; Or 30% flyash, 51% lime, 19% peat, or 37% flyash, 41% lime, 22% peat.
The invention provides the preparation method of heavy metals immobilization agent, present method comprises:
1) flyash, lime, peat is taken in the ratio of setting, for subsequent use:
2) by peat 450 DEG C of calcining 4.5h in retort furnace.
3) fully mixed by the peat after flyash, lime, calcining, obtain heavy metals immobilization agent, wherein first to utilize ball milling instrument powder fully to pulverize remix even for coal ash, lime, peat.
The present invention also provides heavy metals immobilization agent to solidify the method for Heavy Metals in Contaminated Soils, and the method comprises the following steps:
1) be that 1:10 mixes by described heavy metals immobilization agent and the weight ratio of heavy-metal contaminated soil, stir, obtain compound;
2) add described compound 40%(weight ratio) water, stir, leave standstill shaping, carry out maintenance, complete solidification.
The method of described heavy metals immobilization agent solidification Heavy Metals in Contaminated Soils, in described step 1), is that 1:10 mixes by described heavy metals immobilization agent weight and the weight ratio of contaminated soil.
The method of described heavy metals immobilization agent solidification Heavy Metals in Contaminated Soils, described step 2) in churning time be 10min, solidify 15 days.
The method of described heavy metals immobilization agent solidification Heavy Metals in Contaminated Soils, described step 2) surface of solidifying in maintenance processes adopts diaphragm seal.
The method of described heavy metals immobilization agent solidification Heavy Metals in Contaminated Soils, the heavy metal ion in described heavy metal pollution of soil is Pb, As.
The present invention has following beneficial effect:
The inorganic amendment heavy metal that mainly utilizes of the present invention has stronger inhibition, plays the principle of organic materials to the stronger regulatory function of Soil Fertility Quality simultaneously.Flyash is comparatively large in China's quantity discharged at present, and it not only has stronger metal adsorption ability, and can generate the material with pozzolanic activity under the high temperature conditions, and its main component is silicon-dioxide and aluminium sesquioxide, and major part is in amorphous state.The principle of solidification of flyash importantly can generate precipitate metal hydroxides with heavy metal, also there is the surface complexation effect of flocs unit surface mass simultaneously, by adding the mode of industrial flyash as Curing agent, mix heavy metal contaminated soil to be cured with lime, can effective curing heavy metal, and with low cost.Again this basis adds peat and can not affect fixing Pb on the whole, be conducive to the absorption to As, can also change due to problems such as soil pH that lime fly ash causes are too high, soil compaction, increase soil microorganisms and enzymic activity, thus strengthen soil fertility level.
Use the heavy-metal contaminated soil of solidification treatment of the present invention, " dangerous according to People's Republic of China's standard
Refuse judging standard leaching characteristic identification " the Hazardous wastes leaching characteristic identification of (GB5085.3-2007), its experimental result data is lower than Extraction Toxicity Identification Standard of Hazardous Waste value.Compared with prior art, the invention has the advantages that: technical scheme of the present invention is cured by utilizing lime, flyash and peat heavy metal contaminated soil, utilizes inorganic organic curing material to solidify Pb and As simultaneously.Both process the pollution problem of heavy metal, make use of again this kind of industrial waste of flyash simultaneously.In addition, solidifying agent of the present invention and curing not only raw material sources are extensive, low cost of manufacture, and solidification treatment cost relative moderate especially, heavy metal soil after overcuring, under extreme conditions its Leaching of Heavy Metals concentration is still lower than the limit value in Hazardous wastes judging standard, and toxicity risk obviously reduces, and solidification effect is ideal.
Embodiment
Detailed description below by embodiment illustrates the present invention further, but is not to limit of the present invention
System, only does example explanation.
Embodiment 1
1) take the flyash that weight percent is 30%, the lime of 35%, the peat of 35%, peat first calcines 4.5h at retort furnace under 450 DEG C of high temperature, utilizes ball milling instrument to be fully pulverized and mixed, obtains heavy metals immobilization agent;
2) take Pb, As contaminated soil 100g, add the above-mentioned solidifying agent of 10g, stir, add described compound 40%(weight ratio) tap water, fully stir 10min, mix, adopt diaphragm seal, leave standstill maintenance 15 days;
3) 15 days after fixing bodies use solid waste Leaching leaching method-hac buffer method (HJ/T300-2007) to obtain leach liquor respectively, and adopt " mensuration of soil pH " (agricultural industry criteria NY/T 1377-2007) to measure soil pH value.
After testing, after the leaching concentration of Pb drops to solidification by 34.1 mg/L before solidifying, 3.6mg/L is lower than detected value, and the leaching concentration of As drops to the 1.8mg/L after solidification lower than detectability by 21.2 mg/L before solidifying, and pH value stabilization is about 5.78.
Embodiment 2
1) take the flyash that weight percent is 40%, the lime of 40%, the peat of 20%, peat first calcines 4.5h at retort furnace under 450 DEG C of high temperature, utilizes ball milling instrument to be fully pulverized and mixed, obtains heavy metals immobilization agent;
2) take Pb, As contaminated soil 100g, add the above-mentioned solidifying agent of 10g, stir, add described compound 40%(weight ratio) tap water, fully stir 10min, mix, adopt diaphragm seal, leave standstill maintenance 15 days;
3) 15 days after fixing bodies use solid waste Leaching leaching method-hac buffer method (HJ/T300-2007) to obtain leach liquor respectively, and adopt " mensuration of soil pH " (agricultural industry criteria NY/T 1377-2007) to measure soil pH value.
After testing, after the leaching concentration of Pb drops to solidification by 34.8 mg/L before solidifying, 3.1mg/L is lower than detected value, and the leaching concentration of As drops to the 1.9mg/L after solidification lower than detectability by 21.5 mg/L before solidifying, and pH value stabilization is about 5.82.
Embodiment 3
1) take the flyash that weight percent is 30%, the lime of 51%, the peat of 19%, peat first calcines 4.5h at retort furnace under 450 DEG C of high temperature, utilizes ball milling instrument to be fully pulverized and mixed, obtains heavy metals immobilization agent;
2) take Pb, As contaminated soil 100g, add the above-mentioned solidifying agent of 10g, stir, add described compound 40%(weight ratio) tap water, fully stir 10min, mix, adopt diaphragm seal, leave standstill maintenance 15 days;
3) 15 days after fixing bodies use solid waste Leaching leaching method-hac buffer method (HJ/T300-2007) to obtain leach liquor respectively, and adopt " mensuration of soil pH " (agricultural industry criteria NY/T 1377-2007) to measure soil pH value.
After testing, after the leaching concentration of Pb drops to solidification by 33.6 mg/L before solidifying, 2.3mg/L is lower than detected value, and the leaching concentration of As drops to the 2.2mg/L after solidification lower than detectability by 22.3 mg/L before solidifying, and pH value stabilization is about 5.8.
Claims (9)
1. a heavy metals immobilization agent, is characterized in that: by weight percentage, and described solidifying agent is grouped into by following three kinds of one-tenth: flyash 30%-40%, lime 35%-51%, peat 19%-35%.
2. heavy metals immobilization agent according to claim 1, is characterized in that: add the flyash of 30%, the lime of 35%, the peat of 35%; Or 40% flyash, 40% lime, 20% peat; Or 30% flyash, 51% lime, 19% peat, or 37% flyash, 41% lime, 22% peat.
3. the preparation method of heavy metals immobilization agent according to claim 1 or 2, is characterized in that,
1) flyash, lime, peat is taken in the ratio of setting, for subsequent use:
2) by peat 450 DEG C of calcining 4.5h in retort furnace;
3) peat after flyash, lime, calcining is fully mixed, obtain heavy metals immobilization agent.
4. the preparation method of heavy metals immobilization agent according to claim 3, is characterized in that, first utilizes ball milling instrument that flyash, lime, peat are fully pulverized remix even.
5. the method for Heavy Metals in Contaminated Soils is solidified in heavy metals immobilization agent according to claim 4, it is characterized in that:
1) be that 1:10 mixes by described heavy metals immobilization agent and the weight ratio of heavy-metal contaminated soil, stir, obtain compound;
2) add described compound 40%(weight ratio) water, stir, leave standstill shaping, carry out maintenance, complete solidification.
6. the method for Heavy Metals in Contaminated Soils is solidified in heavy metals immobilization agent according to claim 5, and it is characterized in that, in described step 1), be that 1:10 mixes by described heavy metals immobilization agent weight and the weight ratio of contaminated soil.
7. according to claim 6 heavy metals immobilization agent solidification Heavy Metals in Contaminated Soils method, it is characterized in that, described step 2) in churning time be 10min, solidify 15 days.
8. the method for heavy metals immobilization agent solidification Heavy Metals in Contaminated Soils according to claim 7, is characterized in that, described step 2) surface of solidifying in maintenance processes adopts diaphragm seal.
9. the method for Heavy Metals in Contaminated Soils is solidified in heavy metals immobilization agent according to claim 8, and it is characterized in that, the heavy metal ion in described heavy metal pollution of soil is Pb, As.
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| CN201410745013.1A CN104479686B (en) | 2014-12-09 | 2014-12-09 | A kind of heavy metal curing agent and its curing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598156A (en) * | 2016-01-14 | 2016-05-25 | 中国矿业大学 | Heavy metal curing agent and method for treating heavy metal compound contaminated soil by same |
| CN105838380A (en) * | 2016-04-22 | 2016-08-10 | 广西喷施宝股份有限公司 | Soil restoration conditioner for treating cadmium pollution |
| CN105855283A (en) * | 2016-06-15 | 2016-08-17 | 中科院广州化灌工程有限公司 | Treatment method for heavy metal contaminated soil |
| CN106350079A (en) * | 2016-08-26 | 2017-01-25 | 夏百庆 | Soil heavy metal pollution curing agent |
| CN109526523A (en) * | 2019-01-04 | 2019-03-29 | 杰瑞(莱州)矿山治理有限公司 | A method of carrying out restoration of the ecosystem on acid Tailings Dam |
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| CN102746850A (en) * | 2012-07-02 | 2012-10-24 | 浩蓝环保股份有限公司 | Preparation method of fly ash stabilizing agent for managing heavy metal pollution |
| CN104056855A (en) * | 2014-06-27 | 2014-09-24 | 山鑫科陶科技（北京）股份有限公司 | Reparation method of polluted soil |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105598156A (en) * | 2016-01-14 | 2016-05-25 | 中国矿业大学 | Heavy metal curing agent and method for treating heavy metal compound contaminated soil by same |
| CN105838380A (en) * | 2016-04-22 | 2016-08-10 | 广西喷施宝股份有限公司 | Soil restoration conditioner for treating cadmium pollution |
| CN105855283A (en) * | 2016-06-15 | 2016-08-17 | 中科院广州化灌工程有限公司 | Treatment method for heavy metal contaminated soil |
| CN106350079A (en) * | 2016-08-26 | 2017-01-25 | 夏百庆 | Soil heavy metal pollution curing agent |
| CN109526523A (en) * | 2019-01-04 | 2019-03-29 | 杰瑞(莱州)矿山治理有限公司 | A method of carrying out restoration of the ecosystem on acid Tailings Dam |
| CN109526523B (en) * | 2019-01-04 | 2021-04-20 | 杰瑞(莱州)矿山治理有限公司 | Method for carrying out ecological restoration on acid tailing pond |
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| CN104479686B (en) | 2018-11-27 |
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Effective date of registration: 20181015 Address after: 410152 Hunan province Changsha Changsha County Beishan town Beishan village Wan Valley ridge Applicant after: Hunan Hanyang Environmental Protection Technology Co., Ltd. Address before: 237000 Meng Feng Group, Peng Dian village, Feng Jing Town, Huoqiu County, Lu'an, Anhui Applicant before: Meng Tao |
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