CN108176707A - Lead-cadmium composite polluted soil in-situ passivator and preparation method thereof - Google Patents
Lead-cadmium composite polluted soil in-situ passivator and preparation method thereof Download PDFInfo
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- CN108176707A CN108176707A CN201711462016.4A CN201711462016A CN108176707A CN 108176707 A CN108176707 A CN 108176707A CN 201711462016 A CN201711462016 A CN 201711462016A CN 108176707 A CN108176707 A CN 108176707A
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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
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention relates to a lead-cadmium composite polluted soil in-situ passivator which is prepared from the following raw materials in parts by mass: 6-10 parts of clay mineral, 45-60 parts of industrial waste, 4-6 parts of monocalcium phosphate and 2-5 parts of iron salt; wherein the industrial waste is any one or mixture of fly ash and red mud. The invention also relates to a preparation method and a use method of the lead-cadmium composite polluted soil in-situ passivator. The lead-cadmium composite polluted soil in-situ passivator can obviously reduce exchangeable state contents of lead, cadmium and other heavy metals in soil, and has the advantages of good passivation and repair effect, low repair cost, convenience in use, no damage to soil structure and the like.
Description
Technical field
The present invention relates to farmland soil modifying technical fields, are passivated more particularly to a kind of lead cadmium combined pollution soil in-situ
Agent and preparation method thereof.
Background technology
Soil is the core of resource, is basis and human survival and the important medium lived that animal and plant growth is bred.
Final receptor of the soil as atmosphere pollution, water pollution and solid waste, easily being damaged by mankind's activity causes to be contaminated,
Its pollute mainly by the adopting of mineral resources, select, smelting etc. industrial " three wastes " and dirty filling, pesticide, chemical fertilizer agriculturally
Caused by unreasonable application etc..
Often based on a certain heavy metal element, two or more heavy metal is first for heavy metal pollution in soil
Element exist simultaneously in the soil and its content obviously higher than national standard of soil environment quality or have reached influence soil ring
Border quality level, i.e. referred to as various heavy and the combined pollution deposited.
Due to the diversity of heavy metal pollution of soil, complexity, technical difficulty is brought for repairing and treating.At present, it is common
Remediation of heavy metal-contaminated soil can be divided into engineering measure, electro reclamation, chemical leaching method, chemical passivation repairing method, plant
Object reparation and microorganism remediation method.From the point of view of existing administering method, every recovery technique has its advantage, while all exists again
Certain limitation.
It is based on adding stabilization agent into soil, by adsorbing, precipitating, being complexed, ion exchange and oxidation that passivation, which is repaired,
The series reactions such as reduction, to reduce the biological effectiveness of pollutant and transportable property, so as to reach the method for repairing purpose.This
Kind method has the reparation of pollution in wide area soil because putting into the superiority such as low, efficient, reparation is quick, easy to operate
Preferable application prospect.
At present, the passivation reparation of heavy metal pollution of soil is concentrated mainly on single-element, to soil various heavy simultaneously
Repairing research is less while the combined pollution deposited.And soil is typically to be polluted by various heavy in reality, combined pollution soil
Different heavy metal ion have unique travelling performance in earth, and there are antagonism, collaboration, adductions between different elements or compound
Etc. reciprocations, it is difficult to which the mobility of contents of many kinds of heavy metal ion and a variety of pollutions of passivation can be reduced by finding out single substance
Object.Therefore, the renovation agent of multiple pollutant can be passivated simultaneously by developing, and be to repair successful key problem in technology, while can be greatly
Reduce rehabilitation cost, the direction worked hard as scientific and technical personnel.
Invention content
Based on this, it is an object of the present invention to for soil in reality usually by the situation of various heavy combined pollution,
A kind of lead cadmium combined pollution soil in-situ passivator is provided, the heavy metals such as lead (Pb), cadmium (Cd) can be significantly reduced in the soil
Exchangeable species content, have many advantages, such as be passivated repairing effect it is good, rehabilitation cost is low, it is easy to use, soil texture will not be destroyed.
The technical solution that the present invention takes is as follows：
A kind of lead cadmium combined pollution soil in-situ passivator, is made of the raw material of following mass fraction：
6-10 parts of clay mineral, 45-60 parts of trade waste, 4-6 parts of calcium dihydrogen phosphate, 2-5 parts of molysite；Wherein, it is described
Trade waste is any one or two kinds of mixing in flyash, red mud.
Wherein, for clay mineral mainly by suction-operated come the metal in rehabilitating soil, suction-operated includes surface
Absorption is adsorbed with ion exchange, and adsorption is because it is with huge surface area, and surface can be larger, causes system free energy
It reduces；Ion-exchange absorption supplemental provisions are to make clay mineral band permanent charge by isomorph replacement, so as to adsorb different electron ion
Ensure charge balance, the interlayer of clay mineral also has a large amount of negative electrical charge (hydroxyl), matches with the heavy metal ion in soil
After cooperation is used, the exchange state of heavy metal is substantially reduced.
Flyash and red mud are generated by-product in industrial processes, contain a large amount of Fe2O3、Al2O3And CaO,
Their large specific surface area, therefore have stronger adsorption capacity to heavy metal in soil (Cu, Pb, Cd, Zn).Annual China generates
Red mud, flyash quantity be up to millions of tons it is right so that the trade waste largely stacked seriously occupies a large amount of soils
Ecological environment adversely affects, and trade waste is used as to the passivator of combined contamination soil, can realize with pollution treatment of giving up,
Turn waste into wealth.
Calcium dihydrogen phosphate (Ca (H2PO4)2), Pb and di(2-ethylhexyl)phosphate in soil different to the repair mechanisms of different metals
Hydrogen calcium can generate the mineral of solubility very little, and a variety of effects such as absorption, co-precipitation occur, wherein making using precipitation mechanism to be leading
With；Cd, Zn, Cu in soil mainly enter the indefinite form lattice of calcium dihydrogen phosphate by ion exchange, surface complexing
Middle that passivation and precipitation occurs, wherein Cd is more likely to and the Ca in calcium dihydrogen phosphate2+Ion exchange occurs, so as to enter di(2-ethylhexyl)phosphate
In the lattice of hydrogen calcium.
Molysite plays the role of activating other raw materials, and compared with single passivator, calcium dihydrogen phosphate is used in compounding with molysite
Can promote oxidable state Cd to can reduction-state conversion and the conversion of residual form Cd, therefore passivator can be improved integrally to Polluted Soil
The passivation of earth, repairing effect.
When administering combined contamination soil, each group split-phase in lead cadmium combined pollution soil in-situ passivator of the present invention
Mutually cooperation, collective effect so that the exchangeable species content of heavy metal in the soil substantially reduces, and mobility is remarkably decreased.Pass through
Find that the leaching rate of lead cadmium arsenic after passivation is repaired in soil etc. is very low to being passivated forward and backward soil progress Leaching detection.And
And the primary raw material of the lead cadmium combined pollution soil in-situ passivator is nonmetallic mineral material, itself is widely present in
In soil, and additive amount very little is used, soil texture will not be destroyed, physical and chemical index, nutritive index to soil etc. do not have
It influences.
Relative to the prior art, passivator formula of the invention is reasonable, and raw material is cheap and easy to get, and with preparation process letter
It is single, input is low, repairs the superiority such as rapidly and efficiently, have preferable application prospect for the reparation of pollution in wide area soil.
Further, the clay mineral be kaolin, sepiolite, bentonite, zeolite, in diatomite any one or
A variety of mixing.
Further, the clay mineral is 1 by mass ratio:1 sepiolite is mixed with zeolite.Sepiolite and zeolite
It is natural clay mineral, derives from a wealth of sources that there is larger specific surface area and good mechanical stability, have to environment preferably
Self-purification capacity.
Further, the trade waste is 6 by mass ratio:1 flyash is mixed with red mud.
Further, the molysite is ferrous sulfate (FeSO4), ferric sulfate (Fe2(SO4)3), bodied ferric sulfate, six hydration
Iron chloride (FeCl3·6H2O any one or more mixing in).
Further, it is made of the raw material of following mass fraction：8.5 parts of clay mineral, 50 parts of trade waste, di(2-ethylhexyl)phosphate
5 parts of hydrogen calcium, 2.5 parts of molysite.
Another object of the present invention is to provide lead cadmium combined pollution soil in-situ passivator described in any one of the above embodiments
Preparation method, the preparation method include the following steps：
(1) in mass ratio 1:1 weighs sepiolite and zeolite, crushed after mixing, grinding, sieving, obtain mixture, then
Mixture is calcined, crushes, be sieved after cooling, obtain clay mineral；
(2) in mass ratio 6:1 weighs flyash and red mud, compound material is obtained after mixing, then compound material is put into mixed acid
In activated, be filtered, washed, dried, be sieved after activation, obtain trade waste；
(3) by proportioning by trade waste, calcium dihydrogen phosphate and molysite obtained by clay mineral obtained by step (1), step (2)
It is uniformly mixed, obtains the lead cadmium combined pollution soil in-situ passivator.
The preparation method step of the present invention is simple, is easily achieved.Step (1) carries out heat modification, energy to sepiolite and zeolite
Further increase specific surface area and raising mechanical stability, improve its clean-up effect.Step (2) lives to flyash and red mud
Change is handled, and can be increased considerably its specific surface area, be improved the adsorption capacity to heavy metal in soil.
Further, in step (1), calcination temperature is 400-450 DEG C, and calcination time is 2 hours.
Further, in step (2), the mixed acid is the sulphur of the hydrochloric acid and a concentration of 1mol/L by a concentration of 1mol/L
Acid by volume 1:3 mix, and the solid-to-liquid ratio of compound material and mixed acid is 1g:8mL, activation temperature are 80 DEG C, soak time
It is 90 minutes.
Another object of the present invention is to provide lead cadmium combined pollution soil in-situ passivator described in any one of the above embodiments
Application method, the application method include the following steps：500-700kg passivator is applied to the polluted agricultural land per acre after loosening the soil, so
After dig 3-5 times, and soil moisture content is made to maintain in the range of the 35~50% of field capacity in soil surface spray water, apply
It spreads passivator and completes soil remediation after 10-20 days.
The application method of the lead cadmium combined pollution soil in-situ passivator is easy, using additive amount very little, and repairs effect
Rate is high.
Specific embodiment
Lead cadmium combined pollution soil in-situ passivator provided by the invention, is made of the raw material of following mass fraction：
6-10 parts of clay mineral, 45-60 parts of trade waste, 4-6 parts of calcium dihydrogen phosphate, 2-5 parts of molysite.
Wherein, the trade waste is any one in flyash, red mud or two kinds of mixing；The clay mineral is
Any one or more mixing in kaolin, sepiolite, bentonite, zeolite, diatomite；The molysite is ferrous sulfate, sulphur
Any one or more mixing in sour iron, bodied ferric sulfate, ferric chloride hexahydrate.
Specifically, the lead cadmium combined pollution soil in-situ passivator is made of the raw material of following mass fraction：Clay pit
8.5 parts of object, 50 parts of trade waste, 5 parts of calcium dihydrogen phosphate, 2.5 parts of molysite.
As further preferred, the clay mineral is 1 by mass ratio:1 sepiolite is mixed with zeolite, the work
Industry waste is 6 by mass ratio:1 flyash is mixed with red mud, and the molysite is ferric sulfate.
The step of preparing the lead cadmium combined pollution soil in-situ passivator is as follows：
(1) clay mineral is prepared：
1. in mass ratio 1:1 weighs the sepiolite and zeolite air-dried under natural conditions, pours into jaw crusher after mixing
It is crushed, then with disc grinder grinding, then is sieved with vibrating screen, cross 160 mesh sieve, obtain mixture.
It is calcined 2 hours 2. mixture is placed in the furnace body that temperature is 400-450 DEG C, is crushed after cooling, crosses 160 mesh sieve,
Obtain clay mineral.
(2) trade waste is prepared：
1. in mass ratio 6:1 weighs the flyash and red mud air-dried under natural conditions, obtains compound material after mixing, then
By in round tank diameter of the compound material input equipped with mixed acid, activated 90 minutes at a temperature of 80 DEG C, the mixed acid is by dense
Spend the sulfuric acid by volume 1 of the hydrochloric acid and a concentration of 1mol/L for 1mol/L:3 mix, the solid-liquid of compound material and mixed acid
Than for 1g:8mL.
2. after the completion of activation, the mixture of compound material and mixed acid is filtered, then with originally using plate and frame filter press
Gained filter cake twice, is then placed in the baking oven that temperature is 120-150 DEG C and dries, then sieve with 100 mesh sieve, obtain by water washing filter cake
Trade waste.
(3) batch mixing：
Clay mineral, step (2) gained trade waste, calcium dihydrogen phosphate, molysite obtained by step (1) are mixed by proportioning
Uniformly, the calcium dihydrogen phosphate and molysite are the solid powder that grain size is less than 2mm, and the compound dirt of lead cadmium is obtained after mixing
Contaminate soil in-situ passivator.
The application method of the lead cadmium combined pollution soil in-situ passivator is as follows：
First, the soil of pine polluted agricultural land to be repaired is dug.Then, 500- is uniformly applied to the polluted agricultural land per acre after loosening the soil
700kg passivator, then dig 3-5 times, passivator is made to be uniformly mixed with soil.Then, a small amount of water can be sprayed in soil surface, made
Soil moisture content is maintained in the range of the 35~50% of field capacity, and soil particle diameter reaches 1-20 mesh, then takes capping film
Etc. measures on soil carry out moisturizing.It applies passivator and completes soil remediation after 10-20 days.
Application Example one
Using certain heavy-metal composite pollution leave unused arable land soil as experiment soil, in the upper soll layer (0~20cm)
Lead, cadmium content are more than《Standard of soil environment quality》(GB15618-1995) secondary standard index.
Implementation process carries out as follows：
1st, area to be repaired delimited：The arable land of long 10m × wide 3.33m delimited as area to be repaired, in its periphery indwelling
One ditch is simultaneously manually repaiied and makees ridge, is separated with other soil；The height of ridge will exceed arable land more than 15cm.
2nd, it loosens the soil with acquiring preprosthetic pedotheque：Surface layer (0~20cm) soil of area to be repaired is dug into loose (reference
The mode of loosening the soil of conventional farming) after, the preprosthetic pedotheque of acquisition of layouting.
3rd, passivator is applied：By area (667m per acre2) apply 550kg passivator usage ratio, will be of the present invention
Lead cadmium combined pollution soil in-situ passivator uniformly dissipate be spread across on the mellow soil of the digging surface of area to be repaired, then repeat to turn over
It digs 3-5 times, passivator is made to be sufficiently mixed uniformly with soil.
4th, 2-5 days after passivator are applied, primary to a small amount of water of the soil surface of area to be repaired sprinkling daily, sprinkling
Water do not outflow dehydration using soil as maximum limit.
5th, the 6-14 days after passivator are applied, by the soil natural air dry of area to be repaired.
6th, the pedotheque after acquisition is repaired：In a manner of step 2, the pedotheque after acquisition reparation of layouting.
7th, repair process is completed.
To repairing, forward and backward pedotheque carries out leaching test and detection and analysis, detection method are with standard respectively：《Soil
Loamy texture amount lead, Cadmium detrmination》(GB/T17141-1997) graphite furnace atomic absorption spectrometry；《Soil quality Available Lead
And Cadmium detrmination》(GB/T23739-2009) atomic absorption method.Testing result is as shown in table 1：
Table 1 repairs forward and backward pedotheque testing result
Lead, cadmium content are below in soil after reparation《Standard of soil environment quality》(GB15618-1995) two level mark
Quasi- index.
Potting contrast experiment：Each 20kg of soil after taking the preprosthetic soil in the region respectively and repairing, transplants pakchoi,
General field planting management 30 days.The pakchoi to grow out in two kinds of different soils is detected, analysis result is shown in Table 2.
Table 2 repairs the lead of the pakchoi of forward and backward soil plantation, cadmium content testing result
Lead, cadmium content are below in the pakchoi that soil is planted after reparation《National food safety standard》(GB2762-
2012) to the Limited Doses of pakchoi in.
The above results show：Lead cadmium combined pollution soil in-situ passivator of the present invention is highest by biological effectiveness
The heavy metal ion of (being easiest to what is be absorbed by plants) exchangeable species be converted into biological effectiveness it is minimum (least easily by plant
Absorb) residual form, passivation effect is notable.
Application Example two
Using certain heavy-metal composite pollution leave unused nonirrigated farmland soil as experiment soil, in the upper soll layer (0~20cm)
Lead, cadmium content are more than《Standard of soil environment quality》(GB15618-1995) secondary standard index.
Implementation process carries out as follows：
1st, area to be repaired delimited：The arable land of long 8.3m × wide 4.0m delimited as area to be repaired, in its periphery indwelling
One ditch is simultaneously manually repaiied and makees the ridge, is separated with other soil；The height on the ridge will exceed ground level.
2nd, it loosens the soil with acquiring preprosthetic pedotheque：Surface layer (0~20cm) soil of area to be repaired is dug into loose (reference
The mode of loosening the soil of conventional farming) after, the preprosthetic pedotheque of acquisition of layouting.
3rd, passivator is applied：By area (667m per acre2) apply 600kg passivator usage ratio, will be of the present invention
Lead cadmium combined pollution soil in-situ passivator uniformly dissipate be spread across on the mellow soil of the digging surface of area to be repaired, then repeat to turn over
It digs 3-5 times, passivator is made to be sufficiently mixed uniformly with soil.
4th, 2-5 days after passivator are applied, primary to a small amount of water of the soil surface of area to be repaired sprinkling daily, sprinkling
Water do not outflow dehydration using soil as maximum limit.
5th, the 6-14 days after passivator are applied, by the soil natural air dry of area to be repaired.
6th, the pedotheque after acquisition is repaired：In a manner of step 2, the pedotheque after acquisition reparation of layouting.
7th, repair process is completed.
To repairing, forward and backward pedotheque carries out leaching test and detection and analysis, detection method are with standard respectively：《Soil
Loamy texture amount lead, Cadmium detrmination》(GB/T17141-1997) graphite furnace atomic absorption spectrometry；《Soil quality Available Lead
And Cadmium detrmination》(GB/T23739-2009) atomic absorption method.Testing result is as shown in table 3：
Table 3 repairs forward and backward pedotheque testing result
Lead, cadmium content are below in soil after reparation《Standard of soil environment quality》(GB15618-1995) three-level mark
Quasi- index.
Potting contrast experiment：Each 20kg of soil after taking the preprosthetic soil in the region respectively and repairing, transplants southeast scape
My god, general field planting management 54 days.The pakchoi to grow out in two kinds of different soils is detected, analysis result is shown in Table
4。
Table 4 repairs the lead of the Sedum alfredii Hance of forward and backward soil plantation, cadmium content testing result
The above results show：Lead cadmium combined pollution soil in-situ passivator of the present invention is highest by biological effectiveness
The heavy metal ion of (being easiest to what is be absorbed by plants) exchangeable species be converted into biological effectiveness it is minimum (least easily by plant
Absorb) residual form, passivation effect is notable.
Application Example three
Using certain heavy-metal composite pollution leave unused arable land soil as experiment soil, in the upper soll layer (0~20cm)
Lead, cadmium content are more than《Standard of soil environment quality》(GB15618-1995) secondary standard index.
Implementation process carries out as follows：
1st, area to be repaired delimited：The arable land of long 10m × wide 3.33m delimited as area to be repaired, in its periphery indwelling
One ditch is simultaneously manually repaiied and makees ridge, is separated with other soil；The height of ridge will exceed arable land more than 15cm.
2nd, it loosens the soil with acquiring preprosthetic pedotheque：Surface layer (0~20cm) soil of area to be repaired is dug into loose (reference
The mode of loosening the soil of conventional farming) after, the preprosthetic pedotheque of acquisition of layouting.
3rd, passivator is applied：By area (667m per acre2) apply 650kg passivator usage ratio, will be of the present invention
Lead cadmium combined pollution soil in-situ passivator uniformly dissipate be spread across on the mellow soil of the digging surface of area to be repaired, then repeat to turn over
It digs 3-5 times, passivator is made to be sufficiently mixed uniformly with soil.
4th, 2-5 days after passivator are applied, primary to a small amount of water of the soil surface of area to be repaired sprinkling daily, sprinkling
Water do not outflow dehydration using soil as maximum limit.
5th, the 6-14 days after passivator are applied, by the soil natural air dry of area to be repaired.
6th, the pedotheque after acquisition is repaired：In a manner of step 2, the pedotheque after acquisition reparation of layouting.
7th, repair process is completed.
To repairing, forward and backward pedotheque carries out leaching test and detection and analysis, detection method are with standard respectively：《Soil
Loamy texture amount lead, Cadmium detrmination》(GB/T17141-1997) graphite furnace atomic absorption spectrometry；《Soil quality Available Lead
And Cadmium detrmination》(GB/T23739-2009) atomic absorption method.Testing result is as shown in table 5：
Table 5 repairs forward and backward pedotheque testing result
Lead, cadmium content are below in soil after reparation《Standard of soil environment quality》(GB15618-1995) two level mark
Quasi- index.
Potting contrast experiment：Each 20kg of soil after taking the preprosthetic soil in the region respectively and repairing, transplanting three-coloured amaranth, one
As field planting management 35 days.The three-coloured amaranth to grow out in two kinds of different soils is detected, analysis result is shown in Table 6.
Table 6 repairs the lead of the three-coloured amaranth of forward and backward soil plantation, cadmium content testing result
Lead, cadmium content are below in the three-coloured amaranth that soil is planted after reparation《National food safety standard》(GB2762-2012)
In to the Limited Doses of three-coloured amaranth.
The above results show：Lead cadmium combined pollution soil in-situ passivator of the present invention is highest by biological effectiveness
The heavy metal ion of (being easiest to what is be absorbed by plants) exchangeable species be converted into biological effectiveness it is minimum (least easily by plant
Absorb) residual form, passivation effect is notable.
Embodiment described above only expresses the several embodiments of the present invention, and description is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that those of ordinary skill in the art are come
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.
Claims (10)
1. a kind of lead cadmium combined pollution soil in-situ passivator, it is characterised in that：It is made of the raw material of following mass fraction：
6-10 parts of clay mineral, 45-60 parts of trade waste, 4-6 parts of calcium dihydrogen phosphate, 2-5 parts of molysite；Wherein, the industry
Waste is any one or two kinds of mixing in flyash, red mud.
2. lead cadmium combined pollution soil in-situ passivator according to claim 1, it is characterised in that：The clay mineral is
Any one or more mixing in kaolin, sepiolite, bentonite, zeolite, diatomite.
3. lead cadmium combined pollution soil in-situ passivator according to claim 2, it is characterised in that：The clay mineral by
Mass ratio is 1:1 sepiolite is mixed with zeolite.
4. lead cadmium combined pollution soil in-situ passivator according to claim 1, it is characterised in that：The trade waste
It is 6 by mass ratio:1 flyash is mixed with red mud.
5. lead cadmium combined pollution soil in-situ passivator according to claim 1, it is characterised in that：The molysite is sulfuric acid
Any one or more mixing in ferrous iron, ferric sulfate, bodied ferric sulfate, ferric chloride hexahydrate.
6. according to claim 1-5 any one of them lead cadmium combined pollution soil in-situ passivator, it is characterised in that：By following
The raw material of mass fraction is made：8.5 parts of clay mineral, 50 parts of trade waste, 5 parts of calcium dihydrogen phosphate, 2.5 parts of molysite.
7. the preparation method of claim 1-6 any one of them lead cadmium combined pollution soil in-situ passivator, it is characterised in that：
Include the following steps：
(1) in mass ratio 1:1 weighs sepiolite and zeolite, crushed after mixing, grinding, sieving, obtain mixture, then will be mixed
Material calcining is closed, crushes, be sieved after cooling, obtain clay mineral；
(2) in mass ratio 6:1 weighs flyash and red mud, obtains compound material after mixing, then by compound material put into mixed acid into
Row activation, is filtered, washed after activation, is dried, is sieved, obtain trade waste；
(3) clay mineral, step (2) gained trade waste, calcium dihydrogen phosphate and molysite obtained by step (1) are mixed by proportioning
Uniformly, the lead cadmium combined pollution soil in-situ passivator is obtained.
8. the preparation method of the lead cadmium combined pollution soil in-situ passivator described in claim 7, it is characterised in that：Step (1)
In, calcination temperature is 400-450 DEG C, and calcination time is 2 hours.
9. the preparation method of the lead cadmium combined pollution soil in-situ passivator described in claim 7, it is characterised in that：Step (2)
In, the mixed acid is the sulfuric acid by volume 1 of the hydrochloric acid and a concentration of 1mol/L by a concentration of 1mol/L:3 mix, multiple
The solid-to-liquid ratio for closing material and mixed acid is 1g:8mL, activation temperature are 80 DEG C, and soak time is 90 minutes.
10. the application method of claim 1-6 any one of them lead cadmium combined pollution soil in-situ passivator, feature exist
In：Include the following steps：500-700kg passivator is applied to the polluted agricultural land per acre after loosening the soil, is then dug 3-5 times, and
Soil surface spray water makes soil moisture content maintain in the range of the 35~50% of field capacity, applies passivator 10-20 days
After complete soil remediation.
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| CN109575926A (en) * | 2018-11-26 | 2019-04-05 | 华中农业大学 | Cadmium arsenic combined contamination soil renovation agent |
| CN110791292A (en) * | 2019-05-13 | 2020-02-14 | 湘潭海泡石科技有限公司 | Repairing agent suitable for lead-polluted soil and preparation method thereof |
| CN111057553A (en) * | 2018-10-17 | 2020-04-24 | 武汉市秀谷科技有限公司 | Cadmium and arsenic composite pollution passivator for farmland, preparation method and use method thereof |
| CN111690416A (en) * | 2020-06-24 | 2020-09-22 | 青岛智邦炉窑设计研究有限公司 | Method for producing novel soil conditioning functional material by utilizing industrial solid waste |
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| CN113875343A (en) * | 2021-09-22 | 2022-01-04 | 贵州大学 | Method for rapidly increasing species abundance and diversity of mercury thallium ore waste storage yard |
| CN114517095A (en) * | 2022-01-11 | 2022-05-20 | 中交三航局第八工程(湖南)有限公司 | Roadbed improver for heavy metal contaminated soil and application thereof |
| CN114538722A (en) * | 2022-01-25 | 2022-05-27 | 湖南海澍环保科技有限公司 | In-situ passivator for sludge and process |
| CN115651663A (en) * | 2022-10-10 | 2023-01-31 | 昆明理工大学 | Heavy metal contaminated soil remediation agent and preparation method and application thereof |
| CN115651663B (en) * | 2022-10-10 | 2024-04-12 | 昆明理工大学 | Heavy metal contaminated soil restoration agent and preparation method and application thereof |
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