CN107365589A - A kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material - Google Patents
A kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material Download PDFInfo
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- CN107365589A CN107365589A CN201610313970.6A CN201610313970A CN107365589A CN 107365589 A CN107365589 A CN 107365589A CN 201610313970 A CN201610313970 A CN 201610313970A CN 107365589 A CN107365589 A CN 107365589A
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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
- C09K17/48—Organic compounds mixed with inorganic active ingredients, e.g. polymerisation catalysts
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Abstract
The invention discloses a kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material.It is formed by magnesia host and heavy metals immobilization, insoluble auxiliary combination.Magnesia is obtained by light dolomite high-temperature firing, and addition is the 1 30% of contaminated soil, and because its alkalescence is low, the insoluble effect of heavy metal is good, and speed is fast, and the intensity of solidfied material is high, is adapted to building etc. to utilize；Heavy metals immobilization, insoluble auxiliary agent are combined by curing accelerator, reinforcing agent and organic agglutinant, can improve solidification intensity, promote curing rate, and the insoluble compound of heavy metal is steady in a long-term.Heavy metals immobilization, the addition of insoluble auxiliary agent are the 0.1 10% of contaminated soil, and material of the present invention can be rapidly and efficiently lasting by heavy metal in soil ion（Mainly water-soluble state and exchangeable species）Solidify, be insoluble, reducing its toxicity to ecological environment.The advantages of material is that persistence is good, the lead especially to high concentration（Pb）, mercury（Hg）, cadmium（Cd）, chromium（Cr）, nickel（Ni）, copper（Cu）, zinc（Zn）, silver（Ag）With metalloid arsenic（As）Deng there is good treatment effect.
Description
Technical field
The present invention relates to a kind of heavy-metal contaminated soil to handle material, more particularly to a kind of based on the heavy metal-polluted of magnesia
Contaminate soil solidification, insoluble material.
Background technology
In recent years, city factory is moved, and former address will be used to build the use such as densely populated apartment and flats or business block
During way, the substantial amounts of harmful substance due to soil long term accumulation, thus soil contamination problem receives much concern, and excavates, soil moved in improve the original displacement
And in-situ treatment technology is conventional method.Because quantities is big, input cost is high and is seldom adopted for excavation, soil moved in improve the original displacement
With；In-situ treatment needs to inject medicament into contaminated soil, can cause domain intensity decreases, it is thus proposed that is mixed into direct soil
The methods of ordinary cement, blast-furance cement, improves the intensity of processing soil, but this method can cause soil to become highly basic again
Property, so as to cause the decline of soil remediation effect.
Therefore it is badly in need of developing a kind of rapidly and efficiently pollution administration soil sanitation material, had both required easy to operate, cost
It is cheap, require that purification soil has enough intensity again, be adapted to landfill disposal, while soil secondary pollution will not be caused, safely may be used
Lean on.
The content of the invention
Problem to be solved by this invention is to provide a kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material
Material, can be rapidly and efficiently lasting by heavy metal in soil ion（Mainly water-soluble state and exchangeable species）Solidification, insoluble, drop
Its low toxicity to ecological environment.The advantages of material is that persistence is good, the lead especially to high concentration（Pb）, mercury（Hg）, cadmium
（Cd）, chromium（Cr）, nickel（Ni）, copper（Cu）, zinc（Zn）, silver（Ag）With metalloid arsenic（As）Deng there is good treatment effect.
The present invention is to provide a kind of heavy metal based on magnesia to solve the technical scheme that above-mentioned technical problem uses
Contaminated soil solidification, insoluble material, it is formed by magnesia host and heavy metals immobilization, insoluble auxiliary combination.Oxidation
Magnesium is because its alkalescence is low, and the insoluble effect of heavy metal is good, and speed is fast, and the intensity of solidfied material is high, is adapted to building etc. to utilize；With much money
Category solidification, insoluble auxiliary agent are combined by curing accelerator, reinforcing agent and organic agglutinant, can improve solidification intensity,
Promotion curing rate, the insoluble compound of heavy metal are steady in a long-term.
The above-mentioned heavy-metal contaminated soil solidification based on magnesia, insoluble material, wherein magnesia is by light-burned white clouds
Stone high-temperature firing obtains, and addition is the 1-30% of contaminated soil, and addition is less than 1%, then solidification effect is bad, low intensity, adds
Dosage is higher than 30%, then alkalescence is big, is unfavorable for the insoluble processing of heavy metal.
The above-mentioned heavy-metal contaminated soil solidification based on magnesia, insoluble material, wherein heavy metals immobilization, insoluble help
Agent is that heavy metals immobilization, insoluble auxiliary agent are combined by curing accelerator, reinforcing agent and organic agglutinant.Heavy metal is consolidated
Change, insoluble auxiliary dosage are the 0.1-10% of contaminated soil.Addition is less than 0.1%, then the insoluble effect of heavy metal reduces, Gu
It is relatively low to change body intensity；Addition is higher than 10%, then firming body hardness is big, is unfavorable for the application of curing soil, and cost is high.
The above-mentioned heavy-metal contaminated soil solidification based on magnesia, insoluble material, wherein curing accelerator is peroxophosphoric acid
It is more than one or both of calcium, calcium salt, magnesium salts, blast-furnace cinder, silica.Curing accelerator dosage account for heavy metals immobilization,
The 0.1-60% of insoluble auxiliary agent, preferably 30-50%, less than 0.1%, then do not reach promote solidification effect, hardening time compared with
It is long, higher than 60%, reduce firming body intensity and heavy metals immobilization, insoluble effect.
It is above-mentioned based on magnesia heavy-metal contaminated soil solidification, insoluble material, wherein solidification intensifier be activated carbon,
It is more than one or both of zeolite, diatomite.Solidification intensifier accounts for heavy metals immobilization, the 0.1-60% of insoluble auxiliary agent, best
It is 30-50%, less than 0.1%, does not then have the effect of enhancing firming body, firming body insufficient strength, higher than 60%, then firming body is hard
Degree is big, is unfavorable for the application of curing soil.
The above-mentioned heavy-metal contaminated soil solidification based on magnesia, insoluble material, wherein organic agglutinant is polypropylene
It is more than one or both of sour sodium, polyacrylamide, sodium acrylate-acrylamide copolymer, polyethylene glycol oxide.Organic aggegation
Agent accounts for heavy metals immobilization, the preferably 0.1-40% of insoluble auxiliary agent, 10-20%, and less than 0.1%, then heavy metal stabilizing is poor, its
Less than enhancing heavy metals immobilization, insoluble effect, higher than 40%, then firming body intensity is influenceed, is unfavorable for the application of curing soil.
Present invention contrast prior art has following beneficial effect：Heavy metal pollution provided by the invention based on magnesia
Soil solidification, insoluble material, using low alkalinity magnesia as host, curing heavy metal contaminated soil, while add solidification and promote
Heavy metals immobilization, the insoluble auxiliary agent of agent, reinforcing agent and organic agglutinant composition, multicomponent coordinative role, substantially increase solid
Change speed, the solidifying of the intensity of firming body and heavy metal, insoluble effect.Purification soil neutralisation, intensity is good, will be harmful
Pollutant is thoroughly stable will not to cause secondary pollution in soil, be adapted to soil to recycle.And technique is simple, the material that uses
Expect that cost is cheap.
Embodiment
With reference to embodiment, the invention will be further described.
Embodiment 1
Simulate heavy-metal contaminated soil
402.7mg Copper dichloride dihydrates, 562.66mg zinc chloride, 565.75mg potassium bichromates, 768.7mg tri-chlorinations are weighed first
Chromium, 159.85mg plumbi nitras, 4.21mg cadmium nitrates dissolve the aqueous solution to form 50g, are added to the soil of the 100g mesh sieve of mistake 100
In, 24 hours are stood, crushed 100 mesh sieves again.Obtain the simulation heavy-metal contaminated soil of table 1.
Embodiment 1-5 and comparative example 1-3
The simulation heavy-metal contaminated soil 10g of above-mentioned table 1 is weighed, adds deionized water 5g, is well mixed, according to table 2
Proportioning combination is mixed into above-mentioned soil, and mixed volume is the 30% of contaminated soil, is stirred, and stands 24 hours, and embodiment 1- is made
5 and comparative example 1-3 soil sample to be measured.
According to Tessier continuous extractions, soluble state heavy metal in soil is extracted with deionized water, pH7,25 DEG C, according to
Water and soil ratio 100：1 adds water, shakes 2 hours, and 6000r/min centrifugations 20min takes supernatant liquor, then the MgC1 with 1mol/L2
Solution extraction exchangeable species heavy metal, pH7,25 DEG C, according to MgC12Solution and soil ratio 100：1 plus MgC12Solution, concussion 2 are small
When, 6000r/min centrifugations 20min takes supernatant liquor.The heavy metal tested again with inductance coupled plasma device in solution contains
Amount, so as to evaluate the treatment effect of heavy metal-polluted soil cleaning treatment material heavy metal of the present invention, the results are shown in Table 3.
In terms of result of the test：Heavy-metal contaminated soil solidification/insoluble material based on magnesia include magnesia host and
Solidification/insoluble auxiliary agent（Curing accelerator, reinforcing agent and organic agglutinant）, only use magnesia host solidification effect and a huge sum of money
Belong to that insoluble effect is poor, do not reach safe concentration range, add curing accelerator, curing rate can be accelerated；Add solidification
Reinforcing agent, firming body intensity can be strengthened；Organic agglutinant is added, the insoluble effect of heavy metal can be improved, what three was formed
Solidification/insoluble auxiliary agent acts synergistically with magnesia host, substantially increase material heavy metal contaminated soil solidification of the present invention/
Insoluble effect.
Claims (11)
1. a kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material, it is characterised in that include magnesia and consolidate
Change host and heavy metals immobilization, insoluble auxiliary combination form.
2. a kind of heavy-metal contaminated soil solidification based on magnesia as claimed in claim 1, insoluble material, its feature exist
In magnesia be host.
3. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1 and 2, insoluble material, it is special
Sign is that the dosage of magnesia host is the 1-30% of contaminated soil.
4. a kind of heavy-metal contaminated soil solidification based on magnesia as claimed in claim 1, insoluble material, its feature exist
Heavy metals immobilization, insoluble auxiliary agent are that heavy metals immobilization, insoluble auxiliary agent are by curing accelerator, reinforcing agent and organic agglutinant
Combine.
5. a kind of heavy-metal contaminated soil solidification based on magnesia as claimed in claim 1, insoluble material, its feature exist
Heavy metals immobilization, insoluble auxiliary dosage are the 0.1-10% of contaminated soil.
6. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1,4 and 5, insoluble material, its
Feature is more than one or both of calcium superphosphate, calcium salt, magnesium salts, blast-furnace cinder, silica in curing accelerator.
7. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1,4,5 and 6, insoluble material,
Its feature accounts for the 0.1-60% of heavy metals immobilization, insoluble auxiliary agent in curing accelerator dosage.
8. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1,4 and 5, insoluble material, its
Feature is more than one or both of activated carbon, zeolite, diatomite in solidification intensifier.
9. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1,4,5 and 8, insoluble material,
Its feature accounts for the 0.1-60% of heavy metals immobilization, insoluble auxiliary agent in solidification intensifier.
10. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1,4 and 5, insoluble material, its
Feature is in organic agglutinant is Sodium Polyacrylate, polyacrylamide, sodium acrylate-acrylamide copolymer, polyethylene glycol oxide
One or more.
11. a kind of heavy-metal contaminated soil solidification based on magnesia as described in claim 1,4,5 and 10, insoluble material
Material, its feature account for the 0.1-40% of heavy metals immobilization, insoluble auxiliary agent in organic agglutinant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610313970.6A CN107365589A (en) | 2016-05-13 | 2016-05-13 | A kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material |
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| CN201610313970.6A CN107365589A (en) | 2016-05-13 | 2016-05-13 | A kind of heavy-metal contaminated soil solidification based on magnesia, insoluble material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107057705A (en) * | 2017-05-27 | 2017-08-18 | 南京大学（苏州）高新技术研究院 | A kind of heavy-metal contaminated soil repair materials, preparation method and purposes |
| CN108795430A (en) * | 2018-05-22 | 2018-11-13 | 北京市农林科学院 | A kind of renovation agent and soil remediation method of cadmium pollution soil |
| CN110615585A (en) * | 2019-09-20 | 2019-12-27 | 麻城市众创科技有限公司 | Sludge curing agent and application method thereof |
| CN115637154A (en) * | 2021-07-20 | 2023-01-24 | 和协环保科技股份有限公司 | Metal remover and soil remediation method |
| CN116143468A (en) * | 2022-12-29 | 2023-05-23 | 沈阳工业大学 | Premixed fluid state solidified salty soil and preparation method thereof |
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| JP2014184437A (en) * | 2001-11-30 | 2014-10-02 | Matsuda Giken Kogyo Kk | Solidification insolubilization agent for contaminated soil |
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| CN104312591A (en) * | 2014-10-13 | 2015-01-28 | 贵州美瑞特环保科技有限公司 | Stabilized curing agent for heavy metal contaminated soil or solid waste treatment and treatment method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107057705A (en) * | 2017-05-27 | 2017-08-18 | 南京大学（苏州）高新技术研究院 | A kind of heavy-metal contaminated soil repair materials, preparation method and purposes |
| CN107057705B (en) * | 2017-05-27 | 2020-09-22 | 南京大学（苏州）高新技术研究院 | Heavy metal contaminated soil remediation material, preparation method and application |
| CN108795430A (en) * | 2018-05-22 | 2018-11-13 | 北京市农林科学院 | A kind of renovation agent and soil remediation method of cadmium pollution soil |
| CN110615585A (en) * | 2019-09-20 | 2019-12-27 | 麻城市众创科技有限公司 | Sludge curing agent and application method thereof |
| CN115637154A (en) * | 2021-07-20 | 2023-01-24 | 和协环保科技股份有限公司 | Metal remover and soil remediation method |
| CN116143468A (en) * | 2022-12-29 | 2023-05-23 | 沈阳工业大学 | Premixed fluid state solidified salty soil and preparation method thereof |
| CN116143468B (en) * | 2022-12-29 | 2024-05-17 | 沈阳工业大学 | Premixed fluid state solidified salty soil and preparation method thereof |
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