CN107470350A - A kind of heavy-metal contaminated soil purification method - Google Patents
A kind of heavy-metal contaminated soil purification method Download PDFInfo
- Publication number
- CN107470350A CN107470350A CN201710947316.5A CN201710947316A CN107470350A CN 107470350 A CN107470350 A CN 107470350A CN 201710947316 A CN201710947316 A CN 201710947316A CN 107470350 A CN107470350 A CN 107470350A
- Authority
- CN
- China
- Prior art keywords
- soil
- heavy
- purification method
- magnetic
- metal contaminated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a kind of heavy-metal contaminated soil purification method, comprise the following steps：Add bassanite and carry out dewater treatment；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, non-magnetic purification soil is obtained and magnetic thing soil；The soil of 0.15mm grade enriching pollutants and magnetic into thing soil addition stabilizer to mix, 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.Whole processing procedure, water consumption is few, and does not produce contaminant water and waste residue, contaminated soil can be all made to purification soil, process is simple, and cost is low, high treating effect.
Description
Technical field
The present invention relates to soil remediation technology field, particularly 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, smelting waste water, waste gas is selected to float
Heavy metal element in dirt is all the primary pollution source of environment of mining area, causes surrounding soil by polluting irrigation, atmospheric falling dust etc.
Middle content of beary metal increase, so that soil, surface water, underground water are contaminated.
Known method of soil decontamination has more using the smaller soil particle polluter adhesion amount of particle diameter in soil
Characteristic, the Soil slurry of heavy metal pollution is made using substantial amounts of water, then carry out wet classification processing and remove 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；If another problem is that 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 into thing into magnetic using wet magnetic separator or dry-type magnetic extractor, and carry out
The method of separation.But the method can reduce polluter, the problem of stripping property polluter removes scarce capacity be present.
In addition, also technology proposes to add iron powder adsorption polluter in contaminated soil, then will be adsorbed by magnetic separator
The iron powder recovery of polluter removes, so as to be purified the method for soil.The method can remove stripping property polluter, but
It is that the method is wet processed, it is necessary to which substantial amounts of water carries out sliming, and needs dehydration equipment to be dehydrated, cost is high, in addition
The soil containing polluter magneticly elected is also without progress subsequent treatment.
The content of the invention
It is an object of the invention to provide a kind of heavy-metal contaminated soil purification method, 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, comprises the following steps：
(1) pending contaminated soil addition bassanite is mixed, stands 2~3 hours, carry out dewater treatment；
(2) soil after dehydration is subjected to break process；
(3) soil after will be broken carries out dry classification processing, is classified out the purification soil of+2mm grades, 0.15mm~2mm grains
The soil of level, and the soil of -0.15mm grade enriching pollutants；
(4) iron powder is added in the soil of 0.15mm~2mm grades and mixed；
(5) soil after iron powder mixes will be added and carries out dry type magnetic separation, obtained non-magnetic purification soil and magnetic thing soil；
(6) soil of -0.15mm grade enriching pollutants and magnetic into thing soil addition stabilizer to mix, stabilizer addition is
The 10%~15% of soil quality；
(7) soil after stabilizer mixes will be added and carries out stockpiling 10~15 days, then natural air drying, is purified soil.
Further, step (1) the bassanite addition is 1.2~1.5 times of contaminated soil water content, soil after dehydration
Earth water content is below 5%.
Further, the preferred impact breaker of step (2) disintegrating machine.
Further, step (3) the classification preferred vibratory sieve of processing equipment.
Further, step (4) the iron powder addition 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, each component addition mass ratio is sulfuric acid modified flyash：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 pre-process,
Classification processing, dry type magnetic separation processing step are dry process, part purification soil are can obtain in the case of without using water, separately
Stabilization processes are carried out to the soil for being enriched with polluter outside purification soil is made.Whole processing procedure, water consumption is few, and does not produce
Raw contaminant water and waste residue, contaminated soil can be all made to purification soil, process is simple, and cost is low, high treating effect.
Embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that implement describedly
Example only part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
Embodiment 1
Certain Abandoned Land of Mine heavy-metal contaminated soil, soil moisture content 15%, wherein pollution factor Pb, As, Pb contents
1022mg/kg, As content 301mg/kg.
A kind of heavy-metal contaminated soil purification method of the present embodiment, comprises the following steps：
(1) bassanite that pending contaminated soil is added to 1.2 times of water content mixes, and stands 2 hours, carries out dewater treatment；
(2) soil after dehydration is subjected to break process with impact breaker；
(3) soil after being crushed with vibratory sieve carries out dry classification processing, is classified out the purification soil of+2mm grades, 0.15mm
The soil of~2mm grades, and the soil of -0.15mm grade enriching pollutants；
(4) 0.3% iron powder of soil quality is added in the soil of -0.15mm-2mm grades and mixed；
(5) soil for adding -0.15mm-2mm grades after iron powder mixes is subjected to dry type magnetic separation, magnetic field intensity 0.2T, obtained
Non-magnetic purification soil and magnetic thing soil；
(6) stabilizer that the soil of -0.15mm grade enriching pollutants and magnetic to thing soil addition 10% mixes；
(7) soil after stabilizer mixes will be added and carries out stockpiling 10 days, keep soil moisture 50%, then natural air drying, is obtained
To purification 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：Pb
Content is 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 is 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%, wherein pollution factor Pb, As, Cu, Pb contents
1132mg/kg, As content 314mg/kg, Cu content 241mg/kg.
A kind of heavy-metal contaminated soil purification method of the present embodiment, comprises the following steps：
(1) bassanite that pending contaminated soil is added to 1.3 times of water content mixes, and stands 2.5 hours, carries out at dehydration
Reason；
(2) soil after dehydration is subjected to break process with impact breaker；
(3) soil after being crushed with vibratory sieve carries out dry classification processing, is classified out the purification soil of+2mm grades, 0.15mm
The soil of~2mm grades, and the soil of -0.15mm grade enriching pollutants；
(4) 0.6% iron powder of soil quality is added in the soil of 0.15mm~2mm grades and mixed；
(5) soil for adding 0.15mm~2mm grades after iron powder mixes is subjected to dry type magnetic separation, magnetic field intensity 0.35T is obtained
Non-magnetic purification soil and magnetic thing soil；
(6) stabilizer that the soil of -0.15mm grade enriching pollutants and magnetic to thing soil addition 13% mixes；
(7) soil after stabilizer mixes will be added and carries out stockpiling 13 days, keep soil moisture 55%, then natural air drying, is obtained
To purification 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；It is non-
Magnetic thing 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；At stabilisation
Purification soil after reason：Pb contents are reduced to 28mg/kg, and As contents are reduced to 11mg/kg, and Cu contents are reduced to 20mg/kg.At each purification
Soil after reason reaches safety standard.
Embodiment 3
Certain Abandoned Land of Mine heavy-metal contaminated soil, soil moisture content 20%, wherein pollution factor Pb, As, Cd, Pb contents
1103mg/kg, As content 325mg/kg, Cd content 6.8mg/kg.
A kind of heavy-metal contaminated soil purification method of the present embodiment, comprises the following steps：
(1) bassanite that pending contaminated soil is added to 1.5 times of water content mixes, and stands 3 hours, carries out dewater treatment；
(2) soil after dehydration is subjected to break process with impact breaker；
(3) soil after being crushed with vibratory sieve carries out dry classification processing, is classified out the purification soil of+2mm grades, 0.15mm
The soil of~2mm grades, and the soil of -0.15mm grade enriching pollutants；
(4) 1.0% iron powder of soil quality is added in the soil of 0.15mm~2mm grades and mixed；
(5) soil for adding 0.15mm~2mm grades after iron powder mixes is subjected to dry type magnetic separation, magnetic field intensity 0.5T obtains non-
Magnetic thing purification soil and magnetic thing soil；
(6) stabilizer that the soil of -0.15mm grade enriching pollutants and magnetic to thing soil addition 15% mixes；
(7) soil after stabilizer mixes will be added and carries out stockpiling 15 days, keep soil moisture 60%, then natural air drying, is obtained
To purification 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；It is stable
Purification soil after change processing：Pb contents are reduced to 27mg/kg, and As contents are reduced to 12mg/kg, and Cd contents are reduced to 0.6mg/kg.Respectively
Soil after 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
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (8)
1. a kind of heavy-metal contaminated soil purification method, comprises the following steps：
（1）Pending contaminated soil addition bassanite is mixed, 2 ~ 3 hours is stood, carries out dewater treatment；
（2）Soil after dehydration is subjected to break process；
（3）Soil after will be broken carries out dry classification processing, is classified out the purification soil of+2mm grades, 0.15mm ~ 2mm grades
Soil, and the soil of -0.15mm grade enriching pollutants；
（4）Iron powder is added in the soil of 0.15mm ~ 2mm grades and mixed；
（5）The soil after iron powder mixes will be added and carry out dry type magnetic separation, non-magnetic purification soil is obtained and magnetic thing soil；
（6）The soil of -0.15mm grade enriching pollutants and magnetic into thing soil addition stabilizer to mix, stabilizer addition is
The 10% ~ 15% of soil quality；
（7）The soil after stabilizer mixes will be added and carry out stockpiling 10 ~ 15 days, then natural air drying, is purified soil.
A kind of 2. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（1）Burn
Gypsum addition is 1.2 ~ 1.5 times of contaminated soil water content, and soil moisture content is below 5% after dehydration.
A kind of 3. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（2）It is broken
The broken preferred impact breaker of machine.
A kind of 4. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（3）Point
The level preferred vibratory sieve of processing equipment.
A kind of 5. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（4）Iron
Powder addition is the 0.3% ~ 1.0% of soil quality.
A kind of 6. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（5）It is dry
Formula magnet separator magnetic field intensity is 0.2 ~ 0.5T.
A kind of 7. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（6）Surely
Determine agent to be made up of sulfuric acid modified flyash, lime, phosphoric acid modification attapulgite, citric acid, each component addition mass ratio is sulfuric acid
Modified coal ash：Lime：Phosphoric acid modification attapulgite：Citric acid=1:2:1:0.01.
A kind of 8. heavy-metal contaminated soil purification method according to claim 1, it is characterised in that the step（7）Heap
Soil water content 50% ~ 60% is kept during depositing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710947316.5A CN107470350B (en) | 2017-10-12 | 2017-10-12 | A kind of heavy-metal contaminated soil purification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107470350A true CN107470350A (en) | 2017-12-15 |
| CN107470350B CN107470350B (en) | 2018-08-17 |
Family
ID=60606243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710947316.5A Active CN107470350B (en) | 2017-10-12 | 2017-10-12 | A kind of heavy-metal contaminated soil purification method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107470350B (en) |
| WO (1) | WO2019071996A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109433816A (en) * | 2018-11-26 | 2019-03-08 | 天津大学前沿技术研究院有限公司 | A kind of restorative procedure of glyphosate-heavy-metal composite pollution agricultural land soil |
| WO2019071996A1 (en) * | 2017-10-12 | 2019-04-18 | 大连地拓环境科技有限公司 | Method for purifying heavy metal-contaminated soil |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002320954A (en) * | 2001-04-24 | 2002-11-05 | Onoda Chemico Co Ltd | Heavy metal elution inhibitor of heavy metal contaminated soil and method for inhibiting elution of heavy metal |
| 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 |
| 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 |
| KR20170012627A (en) * | 2015-07-21 | 2017-02-03 | 주식회사 산하이앤씨 | Method of Manufacturing Stabilizers for Heavy Metal-contaminated Soil |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| KR101726742B1 (en) * | 2010-07-15 | 2017-04-13 | 도와 에코 시스템 가부시키가이샤 | Soil cleaning method |
| CN103952156A (en) * | 2014-03-27 | 2014-07-30 | 黎虹 | Heavy metal passivating agent, farmland purifying method and use thereof |
| JP6692136B2 (en) * | 2015-09-01 | 2020-05-13 | Ｄｏｗａエコシステム株式会社 | Decontamination method for 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 |
-
2017
- 2017-10-12 CN CN201710947316.5A patent/CN107470350B/en active Active
-
2018
- 2018-07-31 WO PCT/CN2018/097783 patent/WO2019071996A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002320954A (en) * | 2001-04-24 | 2002-11-05 | Onoda Chemico Co Ltd | Heavy metal elution inhibitor of heavy metal contaminated soil and method for inhibiting elution of heavy metal |
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019071996A1 (en) * | 2017-10-12 | 2019-04-18 | 大连地拓环境科技有限公司 | Method for purifying heavy metal-contaminated soil |
| CN109433816A (en) * | 2018-11-26 | 2019-03-08 | 天津大学前沿技术研究院有限公司 | A kind of restorative procedure of glyphosate-heavy-metal composite pollution agricultural land soil |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107470350B (en) | 2018-08-17 |
| WO2019071996A1 (en) | 2019-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5923039B2 (en) | Soil purification method | |
| Abdelhafez et al. | Feasibility of biochar manufactured from organic wastes on the stabilization of heavy metals in a metal smelter contaminated soil | |
| CN107789787B (en) | Stabilizing agent for repairing arsenic-containing waste residue and using method | |
| Li et al. | The research of nanoparticle and microparticle hydroxyapatite amendment in multiple heavy metals contaminated soil remediation | |
| JP5647371B1 (en) | Detoxification method for contaminated soil | |
| CN104650921A (en) | Restoration agent for lowering cadmium/lead effective state content in soil, and use method and application thereof | |
| JP4235688B2 (en) | Purification method for contaminated soil | |
| JP6334263B2 (en) | Purification method for heavy metal contaminated soil | |
| CN107470350B (en) | A kind of heavy-metal contaminated soil purification method | |
| CN107098550A (en) | Sludge solidifying agent and utilize its solidfied material preparation method | |
| JP2000051835A (en) | Method for cleaning soil by using iron powder | |
| CN104438288B (en) | A kind of containing the stable of arsenic in arsenic waste material and separation method | |
| JP6850634B2 (en) | How to purify mercury-contaminated soil | |
| JP6688576B2 (en) | Decontamination method for contaminated soil | |
| CN107098549A (en) | Sludge solidifying agent and utilize its solidfied material preparation method | |
| Oh et al. | Evaluating heavy metal stabilization efficiency of chemical amendment in agricultural field: Field experiment | |
| CN108298854B (en) | Sludge solidification/stabilization curing agent and preparation method and application thereof | |
| Radjenovic et al. | Removal of Ni2+ from aqueous solution by blast furnace sludge as an adsorbent | |
| WO2021193571A1 (en) | Treatment method for incinerator fly ash | |
| JP2011195399A (en) | Method for treating coal ash | |
| Zhang et al. | Amendments for simultaneous stabilization of lead, zinc, and cadmium in smelter-contaminated topsoils | |
| JP2018103133A (en) | Soil treatment material and purification method of heavy metal contaminated soil | |
| CN113480118A (en) | Dredged sediment solidification modification method | |
| JP2004292806A (en) | Soil renewing agent and method for renewal of soil | |
| JP6578257B2 (en) | Detoxification method for contaminated soil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |