CN107470350B - A kind of heavy-metal contaminated soil purification method - Google Patents
A kind of heavy-metal contaminated soil purification method Download PDFInfo
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- CN107470350B CN107470350B CN201710947316.5A CN201710947316A CN107470350B CN 107470350 B CN107470350 B CN 107470350B CN 201710947316 A CN201710947316 A CN 201710947316A CN 107470350 B CN107470350 B CN 107470350B
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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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Abstract
The present invention provides a kind of heavy-metal contaminated soil purification methods, include the following steps：Addition bassanite is carried out dehydrating；Break process；Dry classification is the purification soil of+2mm grades, the soil of 0.15mm ~ 2mm grades and the soil of 0.15mm grade enriching pollutants；Iron powder is added in the soil of 0.15mm ~ 2mm grades and carries out dry type magnetic separation, obtains non-magnetic purification soil and magnetic object soil；The soil of 0.15mm grade enriching pollutants and magnetic into object soil and add stabilizer mixing, is stored up 10 ~ 15 days, then natural air drying, is purified soil.The present invention can effectively remove the various heavy in soil, especially preferable to Pb, As treatment effect.Entire processing procedure, water consumption is few, and does not generate contaminant water and waste residue, contaminated soil can be all made to purification soil, process is simple, at low cost, high treating effect.
Description
Technical field
The present invention relates to soil remediation technology field, especially a kind of heavy-metal contaminated soil purification method.
Background technology
In mining mineral resource, especially metallic mineral resources recovery process, barren rock mine tailings select smelting waste water, exhaust gas floating
Heavy metal element in dirt is all the primary pollution source of environment of mining area, leads to surrounding soil by polluting irrigation, atmospheric falling dust etc.
Middle content of beary metal increases, to make soil, surface water, underground water be contaminated.
Known method of soil decontamination has more using the smaller soil particle polluter adhesion amount of grain size in soil
Characteristic makes the Soil slurry of heavy metal pollution using a large amount of water, then carries out wet classification processing and removes fine product.
But the problems of the method is：Sewage treatment step caused by sliming and for handling the dehydration cost of residue
It is larger；Another problem is that if in contaminated soil in the case of polluter too high levels, after removing bulky grain soil, can not produce
Raw recycling clean earth.
In addition, there is technology to propose that enriching pollutants object at magnetic using wet magnetic separator or dry-type magnetic extractor, and carry out
The method of separation.But the method can reduce polluter, there are problems that stripping property polluter removes scarce capacity.
In addition, also technology proposes to add iron powder adsorption polluter in contaminated soil, then will be adsorbed by magnetic separator
The iron powder recycling of polluter removes, the method to be purified soil.The method can remove stripping property polluter, but
Be the method it is wet processed, needs a large amount of water to carry out sliming, and dehydration equipment is needed to be dehydrated, it is of high cost, in addition
The soil containing polluter magneticly elected is also without carrying out subsequent processing.
Invention content
The purpose of the present invention is to provide a kind of heavy-metal contaminated soil purification methods, to solve present in background technology
Problem.
The technical proposal of the invention is realized in this way：
A kind of heavy-metal contaminated soil purification method, includes the following steps：
(1) pending contaminated soil is added into bassanite mixing, stands 2~3 hours, is carried out dehydrating；
(2) dewatered soil is subjected to break process by crusher；
(3) broken soil is subjected to dry classification processing by being classified processing equipment, is classified out the net of+2mm grades
Change the soil of soil, the soil of 0.15mm~2mm grades, and -0.15mm grade enriching pollutants；
(4) iron powder is added to mixing in the soil of 0.15mm~2mm grades；
(5) soil after addition iron powder mixing is subjected to dry type magnetic separation by dry-type magnetic extractor, obtains non-magnetic purification
Soil and magnetic object soil；
(6) soil of -0.15mm grade enriching pollutants and magnetic into object soil and adds stabilizer mixing, stabilizer addition
Amount is the 10%~15% of soil quality；
(7) soil after addition stabilizer mixing is subjected to stockpiling 10~15 days, then natural air drying, is purified soil
Earth.
Further, step (1) the bassanite additive amount is 1.2~1.5 times of contaminated soil water content, soil after dehydration
5% or less earth water content.
Further, the preferred impact breaker of step (2) crusher.
Further, the step (3) is classified the preferred vibrating screen of processing equipment.
Further, step (4) the iron powder additive amount is the 0.3%~1.0% of soil quality.
Further, step (5) the dry-type magnetic extractor magnetic field intensity is 0.2~0.5T.
Further, step (6) stabilizer is by sulfuric acid modified flyash, lime, phosphoric acid modification attapulgite, lemon
Acid composition, it is sulfuric acid modified flyash that each component, which adds mass ratio,：Lime：Phosphoric acid modification attapulgite：Citric acid=1:2:1:
0.01。
Further, soil water content 50%~60% is kept during step (7) stockpiling.
Beneficial effects of the present invention are：
The present invention can effectively remove the various heavy in soil, especially preferable to Pb, As treatment effect, and locate in advance
Reason, classification processing, dry type magnetic separation processing step are dry process, and a part of purification can be obtained without using water
In addition soil carries out stabilization processes to the soil for being enriched with polluter and purification soil is made.Entire processing procedure, water consumption is few,
And contaminant water and waste residue are not generated, contaminated soil can be all made to purification soil, process is simple, at low cost, treatment effect
It is good.
Specific implementation mode
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that implement describedly
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
Certain Abandoned Land of Mine heavy-metal contaminated soil, soil moisture content 15%, pollution factor Pb, As, wherein Pb contents
1022mg/kg, As content 301mg/kg.
A kind of heavy-metal contaminated soil purification method of the present embodiment, includes the following steps：
(1) the bassanite mixing that pending contaminated soil is added to 1.2 times of water content, stands 2 hours, carries out at dehydration
Reason；
(2) dewatered soil is subjected to break process with impact breaker；
(3) broken soil is subjected to dry classification processing with vibrating screen, is classified out the purification soil of+2mm grades,
The soil of 0.15mm~2mm grades, and -0.15mm grade enriching pollutants soil；
(4) 0.3% iron powder of soil quality is added to mixing in the soil of -0.15mm-2mm grades；
(5) by add iron powder mixing after -0.15mm-2mm grades soil carry out dry type magnetic separation, magnetic field intensity 0.2T,
It obtains non-magnetic purification soil and magnetic object soil；
(6) soil of -0.15mm grade enriching pollutants and magnetic to the stabilizer mixing of object soil addition 10%；
(7) soil after addition stabilizer mixing is subjected to stockpiling 10 days, keeps soil moisture 50%, then natural wind
It is dry, it is purified soil.
Soil pollution factor content after processing：
+ 2mm grade purification soils：Pb contents are reduced to 33mg/kg, and As contents are reduced to 15mg/kg；Non-magnetic purification soil
Earth：Pb contents are reduced to 30mg/kg, and As contents are reduced to 15mg/kg；Purification soil after stabilization processes：Pb contents are reduced to 25mg/
Kg, As content are reduced to 13mg/kg.Soil after each purified treatment reaches safety standard.
Embodiment 2
Certain Abandoned Land of Mine heavy-metal contaminated soil, soil moisture content 18%, pollution factor Pb, As, Cu, wherein Pb contain
Measure 1132mg/kg, As contents 314mg/kg, Cu content 241mg/kg.
A kind of heavy-metal contaminated soil purification method of the present embodiment, includes the following steps：
(1) the bassanite mixing that pending contaminated soil is added to 1.3 times of water content, stands 2.5 hours, is dehydrated
Processing；
(2) dewatered soil is subjected to break process with impact breaker；
(3) broken soil is subjected to dry classification processing with vibrating screen, is classified out the purification soil of+2mm grades,
The soil of 0.15mm~2mm grades, and -0.15mm grade enriching pollutants soil；
(4) 0.6% iron powder of soil quality is added to mixing in the soil of 0.15mm~2mm grades；
(5) soil of 0.15mm~2mm grades after addition iron powder mixing is subjected to dry type magnetic separation, magnetic field intensity 0.35T
It obtains non-magnetic purification soil and magnetic object soil；
(6) soil of -0.15mm grade enriching pollutants and magnetic to the stabilizer mixing of object soil addition 13%；
(7) soil after addition stabilizer mixing is subjected to stockpiling 13 days, keeps soil moisture 55%, then natural wind
It is dry, it is purified soil.
Soil pollution factor content after processing：
+ 2mm grade purification soils：Pb contents are reduced to 32mg/kg, and As contents are reduced to 14mg/kg, and Cu contents are reduced to 22mg/
kg；Non-magnetic purification soil：Pb contents are reduced to 32mg/kg, and As contents are reduced to 13mg/kg, and Cu contents are reduced to 21mg/kg；Surely
Fixedization treated purification soil：Pb contents are reduced to 28mg/kg, and As contents are reduced to 11mg/kg, and Cu contents are reduced to 20mg/kg.Respectively
Soil after purified treatment reaches safety standard.
Embodiment 3
Certain Abandoned Land of Mine heavy-metal contaminated soil, soil moisture content 20%, pollution factor Pb, As, Cd, wherein Pb contain
Measure 1103mg/kg, As contents 325mg/kg, Cd content 6.8mg/kg.
A kind of heavy-metal contaminated soil purification method of the present embodiment, includes the following steps：
(1) the bassanite mixing that pending contaminated soil is added to 1.5 times of water content, stands 3 hours, carries out at dehydration
Reason；
(2) dewatered soil is subjected to break process with impact breaker；
(3) broken soil is subjected to dry classification processing with vibrating screen, is classified out the purification soil of+2mm grades,
The soil of 0.15mm~2mm grades, and -0.15mm grade enriching pollutants soil；
(4) 1.0% iron powder of soil quality is added to mixing in the soil of 0.15mm~2mm grades；
(5) soil of 0.15mm~2mm grades after addition iron powder mixing is subjected to dry type magnetic separation, magnetic field intensity 0.5T is obtained
Object soil to non-magnetic purification soil and magnetic；
(6) soil of -0.15mm grade enriching pollutants and magnetic to the stabilizer mixing of object soil addition 15%；
(7) soil after addition stabilizer mixing is subjected to stockpiling 15 days, keeps soil moisture 60%, then natural wind
It is dry, it is purified soil.
Soil pollution factor content after processing：
+ 2mm grade purification soils：Pb contents are reduced to 30mg/kg, and As contents are reduced to 15mg/kg, and Cd contents are reduced to 0.8mg/
kg；Non-magnetic purification soil：Pb contents are reduced to 29mg/kg, and As contents are reduced to 14mg/kg, and Cd contents are reduced to 0.8mg/kg；Surely
Fixedization treated purification soil：Pb contents are reduced to 27mg/kg, and As contents are reduced to 12mg/kg, and Cd contents are reduced to 0.6mg/kg.
Soil after each purified treatment reaches safety standard.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (8)
1. a kind of heavy-metal contaminated soil purification method, includes the following steps：
(1) pending contaminated soil is added into bassanite mixing, stands 2~3 hours, is carried out dehydrating；
(2) dewatered soil is subjected to break process by crusher；
(3) broken soil is subjected to dry classification processing by being classified processing equipment, is classified out the purification soil of+2mm grades
The soil of earth, the soil of 0.15mm~2mm grades, and -0.15mm grade enriching pollutants；
(4) iron powder is added to mixing in the soil of 0.15mm~2mm grades；
(5) soil after addition iron powder mixing is subjected to dry type magnetic separation by dry-type magnetic extractor, obtains non-magnetic purification soil
Object soil with magnetic；
(6) soil of -0.15mm grade enriching pollutants and magnetic into object soil and adds stabilizer mixing, stabilizer additive amount is
The 10%~15% of soil quality；
(7) soil after addition stabilizer mixing is subjected to stockpiling 10~15 days, then natural air drying, is purified soil.
2. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that the step (1) is burnt
Gypsum additive amount is 1.2~1.5 times of contaminated soil water content, 5% or less soil moisture content after dehydration.
3. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that the step (2) is broken
The broken preferred impact breaker of machine.
4. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that the step (3) point
The grade preferred vibrating screen of processing equipment.
5. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that step (4) iron
Powder additive amount is the 0.3%~1.0% of soil quality.
6. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that the step (5) is dry
Formula magnet separator magnetic field intensity is 0.2~0.5T.
7. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that the step (6) is steady
Determine agent to be made of sulfuric acid modified flyash, lime, phosphoric acid modification attapulgite, citric acid, it is sulfuric acid that each component, which adds mass ratio,
Modified coal ash：Lime：Phosphoric acid modification attapulgite：Citric acid=1:2:1:0.01.
8. a kind of heavy-metal contaminated soil purification method according to claim 1, which is characterized in that step (7) heap
Soil water content 50%~60% is kept during depositing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710947316.5A CN107470350B (en) | 2017-10-12 | 2017-10-12 | A kind of heavy-metal contaminated soil purification method |
| PCT/CN2018/097783 WO2019071996A1 (en) | 2017-10-12 | 2018-07-31 | Method for purifying heavy metal-contaminated soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710947316.5A CN107470350B (en) | 2017-10-12 | 2017-10-12 | A kind of heavy-metal contaminated soil purification method |
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| CN107470350B true CN107470350B (en) | 2018-08-17 |
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| CN107470350B (en) * | 2017-10-12 | 2018-08-17 | 大连地拓环境科技有限公司 | A kind of heavy-metal contaminated soil purification method |
| CN109433816B (en) * | 2018-11-26 | 2021-07-06 | 天津大学前沿技术研究院有限公司 | Remediation method for glyphosate-heavy metal combined contaminated farmland soil |
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| JP4663905B2 (en) * | 2001-04-24 | 2011-04-06 | 小野田ケミコ株式会社 | Heavy metal elution inhibitor and heavy metal elution control method for heavy metal contaminated soil |
| JP2005097069A (en) * | 2002-09-19 | 2005-04-14 | Natoo Kenkyusho:Kk | Cold hydraulic treating material, effective utilization method for treating material, modified article modified with treating material, and inorganic formed article worked and prepared by treating material |
| SG187047A1 (en) * | 2010-07-15 | 2013-02-28 | Dowa Eco System Co Ltd | Soil cleaning method |
| CN103952156A (en) * | 2014-03-27 | 2014-07-30 | 黎虹 | Heavy metal passivating agent, farmland purifying method and use thereof |
| CN104609684A (en) * | 2014-12-31 | 2015-05-13 | 华南师范大学 | Application of magnetic grain in in-situ remediation of heavy metal polluted bottom mud or soil |
| KR20170012627A (en) * | 2015-07-21 | 2017-02-03 | 주식회사 산하이앤씨 | Method of Manufacturing Stabilizers for Heavy Metal-contaminated Soil |
| JP6692136B2 (en) * | 2015-09-01 | 2020-05-13 | Ｄｏｗａエコシステム株式会社 | Decontamination method for contaminated soil |
| CN106064178A (en) * | 2016-06-02 | 2016-11-02 | 东莞市环境科学研究所 | A kind of method for safely planting in heavy metal pollution farmland |
| CN106345795A (en) * | 2016-08-22 | 2017-01-25 | 李荣华 | Method for promoting symphytum officinale to enrich and absorb heavy metal from heavy metal contaminated soil |
| CN106734129A (en) * | 2016-12-22 | 2017-05-31 | 胡自田 | A kind of sulfide modifier maize straw soil remediation conditioner and preparation method thereof |
| CN107470350B (en) * | 2017-10-12 | 2018-08-17 | 大连地拓环境科技有限公司 | A kind of heavy-metal contaminated soil purification method |
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| WO2019071996A1 (en) | 2019-04-18 |
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