CN108672482A - One heavy metal species fixative and heavy-metal contaminated soil curing - Google Patents
One heavy metal species fixative and heavy-metal contaminated soil curing Download PDFInfo
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- CN108672482A CN108672482A CN201810360226.0A CN201810360226A CN108672482A CN 108672482 A CN108672482 A CN 108672482A CN 201810360226 A CN201810360226 A CN 201810360226A CN 108672482 A CN108672482 A CN 108672482A
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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
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a heavy metal species fixative and heavy-metal contaminated soil curings, include the following steps：S1, selection use tool and equipment：Crusher, vibrating screen, blender, cement storage tank, single bucket elevator, screw conveyor, proportioning machine, belt conveyor, chemical reagent storage tank, filtered water tank, clarified water pump/chemical pumping, loading machine, clay, HDPE film, curing agent；S2, heavy metal fixative is prepared：It is pretreatment solidification group to choose modified expanded vermiculite, and the solidification group of selection includes calcium hydroxide 5% -20%, chitosan 5% -10%, waterglass 15% -30% and flyash 15% -60%；S3, quenched contaminated soil：Contaminated soil is crushed using crusher first.Compared with other methods; it is simple for process, raw material sources are wide, it is cheap and easy to get, be easy to the advantages that construction, can be widely applied to the heavy metal soil remediation in China; it prevents heavy metal soil from generating toxic action to underground water and organism, plays a dual role of reparation and environmental protection.
Description
Technical field
The present invention relates to soil stabilization fields in environmental project, and more specifically more particularly to a heavy metal species are solid
Determine agent and heavy-metal contaminated soil curing.
Background technology
The mining industry in China is flourishing, and tailings quantity in stock is big, and being vulnerable to the climate change effects such as rainfall leads to the great thing such as dam break
Therefore occur, it causes farmland soil heavy metals at middle and lower reaches to pollute, loses agricultural production function, and pollute the huge sum of money in soil
Owner will be based on organically combine state, the lower occurrence patterns of residual form isoreactivity, and rapidly and efficiently filtering out can repair
The task of the curing materials of high concentration and the relatively low heavy-metal contaminated soil of activity is development trend from now on.
The disposition of heavy-metal contaminated soil is a costly and difficult task, and in-situ passivation reparation is a kind of
The Treatment process of economical and efficient.In the reparation of heavy-metal contaminated soil in-situ passivation, to improve the reparation of heavy-metal contaminated soil
Effect often adds some curing materials, and the relatively broad soil-solidified-agent main source of use scope includes organic, nothing
The materials such as machine class,
Restoration of soil polluted by heavy metal is always international difficult point and hot research problem.A currently used soil huge sum of money
It includes excavation, stabilisation/solidification, chemical leaching, air lift, heat treatment, biological prosthetic etc. to belong to recovery technique mainly.Wherein cure/
Stabilization technology is a kind of technology of waste disposal of comparative maturity, has been applied to the engineering field of heavy metal-polluted soil reparation.
Curing/stabilizing technology has the advantages such as processing time is short, the scope of application is wider compared with other recovery techniques,
Therefore, curing/stabilizing technology is known as handling the best-of-breed technology of harmful poisonous waste by Environmental Protection Agency.Between 1982-2005,
U.S.'s super fund to 977 places repair or intends repairing altogether, wherein there is 217 site remediations to use curing/stabilizing
Technology.The curing/stabilizing that the country such as the U.S. and Britain takes the lead in having carried out contaminated soil is studied, and has formulated corresponding fire protection technology.And
Lag is compared in the curing/stabilizing technical research of China's contaminated soil, and large-scale handling project is relatively deficient.
Heavy metal-polluted soil curing/stabilizing recovery technique refers to the method for utilization physically or chemically by the toxic huge sum of money in soil
Category is fixed up, or heavy metal is converted to the inactive form of chemical property, prevents it from migrating in the environment, spreads and waited
Journey, to reduce heavy metal murder by poisoning degree recovery technique.
According to the definition of EPA, solidification and stabilisation have different meanings.Immobilization technology be pollutant is encapsulated in it is lazy
Property base material in, or outside pollutant add low permeability material, by reduce pollutant exposure leaching area reach limitation
The purpose of contaminant transportation；Stabilisation refers to that the validity from pollutant is converted not pollutant to by Forms Transformation
Soluble, transfer ability or the smaller form of toxicity are innoxious to realize, to reduce its harm risk to the ecosystem.Solidification
Product can be transported easily, without any additional reservoir；And it stabilizes and not necessarily changes the physical of contaminated soil
Shape.
Curing technology has many advantages, such as that technological operation is simple, cheap, curing agent is easy to get, but conventional solidified technology also has
It has the disadvantage that, if soil volume has a different degrees of increase after curing reaction, the long-time stability of firming body are poor etc..And
Stabilization technology can then overcome the problems, such as this, the chemical agent stabilization technology such as developed in recent years, can realize waste
While innoxious, reach waste and reduce perhaps not increase-volume, to improve hazardous waste handle disposal system overall efficiency and
Economy；It can also make the chemical chela between the ingredients such as itself and heavy metal in waste by the structure and performance for improving chelating agent
Cooperation improves the long-time stability for stabilizing product with being strengthened, and reduces and stabilizes product pair during final disposal
The influence of environment.It can be seen that stabilization technology is expected to the main force as heavy metal pollution of soil recovery technique field.
In the prior art, the restorative procedure mainly probed into most of patent that heavy-metal contaminated soil reparation is the theme is
The method of Phytoremediation of Soils Contaminated by Heavy Metals, but there are low output, repairing efficiency is longer the problems such as.And at present about Polluted Soil
Earth heavy metals immobilization method is less, for this purpose, it is proposed that a heavy metal species fixative and heavy-metal contaminated soil curing.
Invention content
The purpose of the present invention is to solve disadvantage existing in the prior art, and the heavy metal species fixative that proposes and
Heavy-metal contaminated soil curing.
To achieve the above object, the present invention provides the following technical solutions：One heavy metal species fixative and heavy metal polluted soil
Earth curing, includes the following steps：
S1, selection use tool and equipment：Crusher, vibrating screen, blender, cement storage tank, single bucket elevator, spiral transferring
Send machine, proportioning machine, belt conveyor, chemical reagent storage tank, filtered water tank, clarified water pump/chemical pumping, loading machine, clay, HDPE film,
Curing agent；
S2, heavy metal fixative is prepared：It is pretreatment solidification group, the solidification group packet of selection to choose modified expanded vermiculite
Calcium hydroxide 5% -20%, chitosan 5% -10%, waterglass 15% -30% and flyash 15% -60% are included；
S3, quenched contaminated soil：Contaminated soil is crushed using crusher first, then contaminated soil is utilized into vibration
It is screened, water is added in the container after screening, the water content of contaminated soil is adjusted to 20%~35%；
S4, pretreatment solidification group：Modified expanded vermiculite and heavy-metal contaminated soil are passed through 1：35~45 mass ratio into
Row mix, ageing placement 1 day -3 days after fully mixing；
S5, solidification group：Soil after ageing is pressed 1：20-30 mix proportions mix solidification component, make it
Cured；
S6, solidification are stablized：Cure in 25 ± 5 DEG C of temperature, humidity are more than 90% and stablizes 5-10 days.
Preferably, the processing method of the modified expanded vermiculite of pretreatment solidification group is to be put into after first grinding expanded vermiculite
It is screened in vibrating screen, the expanded vermiculite after screening is then put into inside heating furnace, calcination processing is carried out to it,
Calcination temperature is 150 DEG C -300 DEG C, and calcination time is 1 hour to 3 hours, will finally be taken out after its natural cooling.
Preferably, the acquisition modes of calcium hydroxide are that quick lime is placed into inside container first, and suitable quantity of water is added to container
After stirred evenly, reaction after the completion of obtain calcium hydroxide, calcium hydroxide screens calcium hydroxide using vibrating screen.
Preferably, quick lime includes calcium oxide, manganese oxide, di-iron trioxide, alundum (Al2O3) and the crystallization water, wherein aoxidizing
The content of calcium accounts for 70% or more of quick lime gross mass.
Preferably, the N- deacetylation contents in chitosan are 55%~70%；The form of waterglass is fixing shape and is
Soluble solids, it is desirable that solubility >=95% of waterglass.
Preferably, flyash includes silica, alundum (Al2O3), di-iron trioxide, calcium oxide, iron oxide, titanium dioxide
The components such as titanium, magnesia, sodium oxide molybdena and potassium oxide screen utilization of fly ash vibrating screen, and the loss on ignition of flyash is less than
15%.
Preferably, the quenched method of contaminated soil is：Contaminated soil is screened using vibrating screen, after screening
Water is added in container, the water content of contaminated soil is adjusted to 20%~35%.
Preferably, the mass ratio of heavy metal fixative and Polluted Soil is 1:10-100.
The technique effect and advantage of the present invention：
1, the fixed component modification expanded vermiculite of the pretreatment being arranged is a kind of with excellent absorption property, ion exchangeable
Can lamellar aluminosilicate mineral, heavy metal ion that can be effectively in the exchange adsorption soil liquid is fixed in its interlamination region
It is interior, reduce its mobility and the toxic action to organism.
2, solidification component can be acted on by self-excitation, and the activity structure of silicon containing component containing aluminium wherein contained is gelled
Reconstruct is formed with the gel solidification structural unit of aluminum-oxygen tetrahedron and oxygen-octahedron, in the process by the huge sum of money in soil
Belong to and carry out further effective solidification, promotes its cured effect.Dual cure effect may be used also to the solidification of heavy metal soil
By according to the property of soil, content of beary metal and its it is existing in the form of adjust between component in ratio and component shared by active principle
Mass fraction, to improve for various pollution types heavy metal soil fixed effect.
3, it can obtain that solidification is close, soil body shrinkage is small and is not likely to produce the firming body of cracking when curing soil, therefore
Impervious, freeze proof/cracking resistance of firming body is preferable, and it is that existing water is stablized preferably to solve conventional curing material solidification soil
Property it is poor, drying shrinkage is big, easy to crack the problems such as, and cured soil be not easy to occur " secondary argillization " phenomenon.
4, simple for process compared with other methods, raw material sources are wide, it is cheap and easy to get, be easy to the advantages that construction, can be extensive
For the heavy metal soil remediation in China, prevents heavy metal soil from generating toxic action to underground water and organism, play reparation
With the double action of environmental protection.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.Based on the embodiments of the present invention, those of ordinary skill in the art are not before making creative work
The every other embodiment obtained is put, shall fall within the protection scope of the present invention.
Embodiment
One heavy metal species fixative and heavy-metal contaminated soil curing, include the following steps：
S1, selection use tool and equipment：Crusher, vibrating screen, blender, cement storage tank, single bucket elevator, spiral transferring
Send machine, proportioning machine, belt conveyor, chemical reagent storage tank, filtered water tank, clarified water pump/chemical pumping, loading machine, clay, HDPE film,
Curing agent；
S2, heavy metal fixative is prepared：It is pretreatment solidification group, the solidification group packet of selection to choose modified expanded vermiculite
Calcium hydroxide 5% -20%, chitosan 5% -10%, waterglass 15% -30% and flyash 15% -60% are included；
S3, quenched contaminated soil：Contaminated soil is crushed using crusher first, then contaminated soil is utilized into vibration
It is screened, water is added in the container after screening, the water content of contaminated soil is adjusted to 20%~35%；
S4, pretreatment solidification group：Modified expanded vermiculite and heavy-metal contaminated soil are passed through 1：35~45 mass ratio into
Row mix, ageing placement 1 day -3 days after fully mixing；
S5, solidification group：Soil after ageing is pressed 1：20-30 mix proportions mix solidification component, make it
Cured；
S6, solidification are stablized：Cure in 25 ± 5 DEG C of temperature, humidity are more than 90% and stablizes 5-10 days.
In summary：Heavy metal species fixative and heavy-metal contaminated soil curing provided by the invention, setting
The fixed component modification expanded vermiculite of pretreatment is a kind of lamellar aluminosilicate with excellent absorption property, ion-exchange performance
Mineral, heavy metal ion that can be effectively in the exchange adsorption soil liquid are fixed in its interlamination region, reduce its mobility and
Toxic action to organism.
Solidification component can be acted on by self-excitation, and the activity structure glue of silicon containing component containing aluminium wherein contained is dignified
Structure is formed with the gel solidification structural unit of aluminum-oxygen tetrahedron and oxygen-octahedron, in the process by the heavy metal in soil
Further effective solidification is carried out, its cured effect is promoted.Dual cure effect can be with to the solidification of heavy metal soil
It is adjusted between component in ratio and component shared by active principle according to the property of soil, content of beary metal and its existing form
Mass fraction, to improve the fixed effect of the heavy metal soil for various pollution types.
It can obtain that solidification is close, soil body shrinkage is small and is not likely to produce the firming body of cracking when curing soil, therefore solid
The impervious, freeze proof/cracking resistance for changing body is preferable, and it is existing water stability preferably to solve conventional curing material solidification soil
Difference, the problems such as drying shrinkage is big, easy to crack, and cured soil are not easy to " secondary argillization " phenomenon occur.
It is simple for process compared with other methods, raw material sources are wide, it is cheap and easy to get, be easy to the advantages that construction, can use extensively
Heavy metal soil remediation in China prevents heavy metal soil from generating toxic action to underground water and organism, play reparation and
The double action of environmental protection.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (8)
1. a heavy metal species fixative and heavy-metal contaminated soil curing, it is characterised in that：Include the following steps：
S1, selection use tool and equipment：Crusher, vibrating screen, blender, cement storage tank, single bucket elevator, helical feed
Machine, belt conveyor, chemical reagent storage tank, filtered water tank, clarified water pump/chemical pumping, loading machine, clay, HDPE film, is consolidated proportioning machine
Agent；
S2, heavy metal fixative is prepared：It is pretreatment solidification group to choose modified expanded vermiculite, and the solidification group of selection includes
Calcium hydroxide 5% -20%, chitosan 5% -10%, waterglass 15% -30% and flyash 15% -60%；
S3, quenched contaminated soil：Contaminated soil is crushed using crusher first, then by contaminated soil using vibrating screen into
Row screening, is added water in the container after screening, the water content of contaminated soil is adjusted to 20%~35%；
S4, pretreatment solidification group：Modified expanded vermiculite and heavy-metal contaminated soil are passed through 1：35~45 mass ratio is mixed
It closes, ageing placement 1 day -3 days after fully mixing；
S5, solidification group：Soil after ageing is pressed 1：20-30 mix proportions mix solidification component, make its progress
Solidification；
S6, solidification are stablized：Cure in 25 ± 5 DEG C of temperature, humidity are more than 90% and stablizes 5-10 days.
2. heavy metal species fixative according to claim 1 and heavy-metal contaminated soil curing, it is characterised in that：
Pre-process solidification group modified expanded vermiculite processing method be expanded vermiculite is ground first after be put into vibrating screen to its into
Row screening, is then put into inside heating furnace by the expanded vermiculite after screening, calcination processing, calcination temperature 150 is carried out to it
DEG C -300 DEG C, calcination time is 1 hour to 3 hours, will finally be taken out after its natural cooling.
3. heavy metal species fixative according to claim 1 and heavy-metal contaminated soil curing, it is characterised in that：
The acquisition modes of calcium hydroxide are that quick lime is placed into inside container first, are stirred evenly after suitable quantity of water is added to container,
Calcium hydroxide is obtained after the completion of reaction, calcium hydroxide screens calcium hydroxide using vibrating screen.
4. heavy metal species fixative according to claim 3 and heavy-metal contaminated soil curing, it is characterised in that：
Quick lime includes calcium oxide, manganese oxide, di-iron trioxide, alundum (Al2O3) and the crystallization water, and the content of wherein calcium oxide accounts for raw stone
70% or more of grey gross mass.
5. heavy metal species fixative according to claim 1 and heavy-metal contaminated soil curing, it is characterised in that：
N- deacetylation contents in chitosan are 55%~70%；The form of waterglass is fixing shape and is soluble solids, it is desirable that
Solubility >=95% of waterglass.
6. heavy metal species fixative according to claim 1 and heavy-metal contaminated soil curing, it is characterised in that：
Flyash includes silica, alundum (Al2O3), di-iron trioxide, calcium oxide, iron oxide, titanium dioxide, magnesia, sodium oxide molybdena
And the components such as potassium oxide, utilization of fly ash vibrating screen is screened, the loss on ignition of flyash is less than 15%.
7. heavy metal species fixative according to claim 1 and heavy-metal contaminated soil curing, it is characterised in that：
The quenched method of contaminated soil is：Contaminated soil is screened using vibrating screen, water is added in the container after screening, it will
The water content of contaminated soil is adjusted to 20%~35%.
8. heavy metal species fixative according to claim 1 and heavy-metal contaminated soil curing, it is characterised in that：
The mass ratio of heavy metal fixative and Polluted Soil is 1:10-100.
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| CN201810360226.0A CN108672482A (en) | 2018-04-20 | 2018-04-20 | One heavy metal species fixative and heavy-metal contaminated soil curing |
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| CN201810360226.0A CN108672482A (en) | 2018-04-20 | 2018-04-20 | One heavy metal species fixative and heavy-metal contaminated soil curing |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220934A (en) * | 2019-06-03 | 2019-09-10 | 东方电气集团东方锅炉股份有限公司 | For improving the method and fixative of specific fuel measuring ash fusion temperature accuracy |
| CN110216139A (en) * | 2019-05-24 | 2019-09-10 | 广州市华南自然资源科学技术研究院 | A kind of water transfer heavy metals in farmland of improving the soil removes the construction method of system |
| CN110449458A (en) * | 2019-08-30 | 2019-11-15 | 广东省生态环境技术研究所 | A kind of safe handling of contaminated soil utilizes method |
| CN111040769A (en) * | 2019-12-17 | 2020-04-21 | 河南省地质环境规划设计院有限公司 | Soil restoration improving agent and soil restoration improving method |
| CN111375630A (en) * | 2020-03-27 | 2020-07-07 | 浙江易承环境科研有限公司 | Soil remediation method |
| CN114989832A (en) * | 2022-05-13 | 2022-09-02 | 华侨大学 | CSGP reagent for repairing beach polluted soil and application method thereof |
| CN115232630A (en) * | 2022-06-23 | 2022-10-25 | 周陈科 | Quality restoration method for improving soil quality |
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| CN106433668A (en) * | 2016-08-30 | 2017-02-22 | 广州润土环境治理有限公司 | Heavy metal pollution soil restoration agent and use method thereof |
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| CN105505399A (en) * | 2015-12-10 | 2016-04-20 | 无锡桥良环境工程技术有限公司 | Heavy-metal solidifying agent and heavy metal contaminated soil solidifying method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110216139A (en) * | 2019-05-24 | 2019-09-10 | 广州市华南自然资源科学技术研究院 | A kind of water transfer heavy metals in farmland of improving the soil removes the construction method of system |
| CN110220934A (en) * | 2019-06-03 | 2019-09-10 | 东方电气集团东方锅炉股份有限公司 | For improving the method and fixative of specific fuel measuring ash fusion temperature accuracy |
| CN110449458A (en) * | 2019-08-30 | 2019-11-15 | 广东省生态环境技术研究所 | A kind of safe handling of contaminated soil utilizes method |
| CN110449458B (en) * | 2019-08-30 | 2022-07-01 | 广东省生态环境技术研究所 | Safe treatment and utilization method of polluted soil |
| CN111040769A (en) * | 2019-12-17 | 2020-04-21 | 河南省地质环境规划设计院有限公司 | Soil restoration improving agent and soil restoration improving method |
| CN111040769B (en) * | 2019-12-17 | 2021-03-23 | 河南省地质环境规划设计院有限公司 | Soil restoration improving agent and soil restoration improving method |
| CN111375630A (en) * | 2020-03-27 | 2020-07-07 | 浙江易承环境科研有限公司 | Soil remediation method |
| CN111375630B (en) * | 2020-03-27 | 2021-08-31 | 浙江易承环境科研有限公司 | Soil remediation method |
| CN114989832A (en) * | 2022-05-13 | 2022-09-02 | 华侨大学 | CSGP reagent for repairing beach polluted soil and application method thereof |
| CN115232630A (en) * | 2022-06-23 | 2022-10-25 | 周陈科 | Quality restoration method for improving soil quality |
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