CN104289512A - Leaching system for Pb-polluted soil and leaching method - Google Patents
Leaching system for Pb-polluted soil and leaching method Download PDFInfo
- Publication number
- CN104289512A CN104289512A CN201410568519.XA CN201410568519A CN104289512A CN 104289512 A CN104289512 A CN 104289512A CN 201410568519 A CN201410568519 A CN 201410568519A CN 104289512 A CN104289512 A CN 104289512A
- Authority
- CN
- China
- Prior art keywords
- leaching
- contaminated soil
- leaching machine
- hydrocyclone
- entrance
- 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.)
- Pending
Links
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a leaching system for Pb-polluted soil and a leaching method. The leaching method comprises the following steps: stirring and conditioning the Pb-polluted soil and NaCl leaching liquid in a blade leaching machine by utilizing the leaching system, conveying the conditioned mixture into a vibrating sieve to carry out preliminary sieving, separating out sand particles with the particle diameter being 0.2 millimeter to 2 millimeters, conveying slurry with the particle diameter being smaller than 0.2 millimeter into a hydraulic cyclone for further separation, separating out fine-particle soil with the particle diameter being 25 microns to 0.2 millimeter, adding Na2CO3 or Ca(OH)2 into the remaining fine slurry with the particle diameter being smaller than 25 microns to carry out precipitating treatment in a precipitation tank, filtering and separating out PbCO3 or Pb(OH)2, carrying out chlorine-salt regeneration by adjusting pH of the solution obtained after filtration, and conveying the regenerated solution back into the blade leaching machine for repeated utilization. The leaching system and the leaching method provided by the invention have the advantages that the process is simple, the operation is easy, the leaching liquid can be repeatedly utilized and agents and water resources are saved and the like.
Description
Technical field
The invention belongs to Pb contaminated soil process field, especially relate to a kind of elution circuit and ELUTION METHOD of Pb contaminated soil.
Background technology
Lead is distributed more widely in heavy-metal contaminated soil, that tool is accumulative by force environmental contaminants.The natural origin of Lead In Soil is the mineral in decayed rock.Along with ore extraction, smelting and processing of metals, I T manufacture, sanitary sewage discharge, sewage irrigation, battery use and the use of doped fuel, the plumbous one of the chief elements having become soil pollution.In soil, Pb normally not easily moves, and is enriched in the upper layer of soil of subsurface several centimetres, and soil increases with pH, cation exchange capacity (CEC), organic carbon content and the ability increase of redox year the adsorption capacity of Pb.Due to high cumulative bad, the feature such as disguise and bio-refractory of Pb, not only cause a large amount of soils to cultivate and lie on the table, but also by food chain effect, the health of human body can be jeopardized.
Soil leaching technology be an application strong, thoroughly can remove the controlled and fireballing soil remediation Treatment process of pollutant, processing procedure, be usually used in the repairing and treating of contaminated site, be widely used in contaminated site reparation abroad, and achieve good repairing effect.Wherein the selection of eluent is the key of recovery technique.The heavy metal eluent reported is surfactant and acids eluent mainly.Surfactant divides the complexing agent of Prof. Du Yucang (EDTA etc.), biosurfactant (comprising rhamnolipid, sophorolipid, husky of ancient India graceful and saponin etc.).EDTA can be combined into stable chelate with most of metal ion because of it, higher removal efficiency is had to the heavy metal etc. in soil, thus be widely used in the reparation of heavy-metal contaminated soil, but there is the problems such as expensive, biological degradability is poor, recovery is difficult in EDTA.In recent years, people start biosurfactant to replace EDTA to be used for Soil leaching, but biosurfactant output is lower, and production cost is higher.Therefore, the plant-scale application of current biosurfactant does not have advantage.Acids eluent mainly comprises inorganic acid solution (HC1 and HNO
3deng), natural organic acids solution (citric acid, malic acid, oxalic acid, malonic acid, humic acid and fulvic acid etc.).Heavy metal in the maximized removal soil of inorganic acid energy, and cheap, but after drip washing, easily cause the physicochemical property of soil to change, make soil present acid, it is comparatively suitable for the soil of Industrial Wasteland serious pollution.Organic acid does not have too large harm to environment yet, and can large-arealy promote the use of.But can only for heavy-metal contaminated soil that is slight or intermediate pollution.For the soil of serious pollution, the problems such as eluent consumption is large, disposal cost is high can be brought.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of elution circuit of Pb contaminated soil, and provides a kind of use NaCl drip washing heavy-metal contaminated soil, and the ELUTION METHOD to the Pb contaminated soil that leacheate recycles.
For solving the problems of the technologies described above, the invention provides a kind of elution circuit of Pb contaminated soil, comprise leaching machine (1), vibratory sieve (2), hydrocyclone (3), sedimentation basin (4), pH regulating reservoir (5), described blade leaching machine (1) outlet is connected with vibratory sieve (2) entrance, described vibratory sieve (2) bottom is connected with described hydrocyclone (3) entrance, the top of described hydrocyclone (3) is connected with described sedimentation basin (4) top, described sedimentation basin (4) taphole is connected with described pH regulating reservoir (5) entrance, described pH regulating reservoir (5) outlet is connected with described leaching machine (1) entrance.
Further, described leaching machine (1) is blade leaching machine (1).
Further, described vibratory sieve (2) bottom is connected with described hydrocyclone (3) entrance by pipeline, pump.
Further, the top of described hydrocyclone (3) is connected with described sedimentation basin (4) top by pipeline.
Further, described pH regulating reservoir (5) outlet is connected with described leaching machine (1) entrance by pipeline, pump.
The present invention also provides a kind of ELUTION METHOD of Pb contaminated soil, first Pb contaminated soil and NaCl leacheate are stirred in described leaching machine (1) and nurse one's health, send into described vibratory sieve (2) after conditioning tentatively to sieve, isolate the sand grains of particle diameter 0.2 ~ 2mm, the mud being less than 0.2mm is sent into described hydrocyclone (3) and is separated further, isolate the fine-grained soil of 25 μm ~ 0.2mm, remaining being less than in the screened stock of 25 μm adds Na
2cO
3or Ca (OH)
2carry out precipitation process at described sedimentation basin (4), after filtering, surplus solution carries out villaumite regeneration described pH regulating reservoir (5) by pH adjustment, and after regeneration, solution sends back to recycling in described leaching machine (1).
Further, the liquid-solid ratio of described NaCl leacheate and contaminated soil is 6:1 ~ 1:1.。
Further, the concentration of described NaCl leacheate is 5 ~ 10mol/L.
The advantage that the present invention has and good effect are: owing to adopting technique scheme, NaCl can as EDTA, the same energy of HCl is efficient and from high pollution soil, remove Pb fast, simultaneously, vibratory sieve is utilized to be separated by soil particle clean for drip washing with hydraulic cyclone method, remaining waste liquid has carried out chemical precipitation process and isolated by filtration, after being separated, solution is regulated as leacheate regeneration by pH value, not only effectively prevent the waste liquid producing secondary pollution, heavy metal in timely Recycling of waste liquid, and reusable edible leacheate, a large amount of NaCl and water resource can be saved.
Accompanying drawing explanation
Fig. 1 is the structural representation of the elution circuit of Pb contaminated soil provided by the invention;
Fig. 2 is the process flow diagram of the ELUTION METHOD of Pb contaminated soil provided by the invention.
In figure:
1, leaching machine 2, vibratory sieve 3, hydrocyclone
4, sedimentation basin 5, pH regulating reservoir
Detailed description of the invention
For a better understanding of the present invention, below in conjunction with specific embodiments and the drawings, the present invention is conducted further description.
The invention provides a kind of elution circuit of Pb contaminated soil, as shown in Figure 1, comprise leaching machine 1, vibratory sieve 2, hydrocyclone 3, sedimentation basin 4, pH regulating reservoir 5, blade leaching machine 1 exports and is connected with vibratory sieve 2 entrance, be connected with hydrocyclone 3 entrance by pipeline, pump bottom vibratory sieve 2, the top of hydrocyclone 3 is connected with sedimentation basin 4 top by pipeline, and sedimentation basin 4 taphole is connected with pH regulating reservoir 5 entrance, and pH regulating reservoir 5 is exported and is connected with leaching machine 1 entrance by pipeline, pump.The present invention also provides a kind of ELUTION METHOD of Pb contaminated soil, and in embodiment 1,2 and 3, leaching machine 1 is blade leaching machine, and process chart as shown in Figure 2.
Embodiment 1
Close Battery Plant's contaminated site at certain and get Pb contaminated soil 20kg, in soil, the content of Pb is 358.4mg/kg, the NaCl leacheate adding 20L in this soil is put into blade leaching machine and is stirred drip washing 120min, the concentration of NaCl leacheate is 5mol/L and allocates pH value=4 with hydrochloric acid, drip washing terminates rear laboratory screen shaker and tentatively sieves, isolate the sand grains of particle diameter >0.2mm, the mud of <0.2mm is sent into laboratory room small-sized hydrocyclone and is separated further, screen out the silt particle of >25 μm, the Na of 0.8mol/L is added in the waste liquid of remaining≤25 μm
2cO
3carry out precipitation process, filter to isolate PbCO
3precipitation, the rear solution of filtration adds HCl and regulates pH to carry out villaumite regeneration.Carry out Pb content analysis to being separated rear sand grains, silt particle, ring waste and the regeneration leacheate after filtering, find that the Pb of in soil 83.2% is removed, in ring waste, the Pb of 96.7% is recovered.
Embodiment 2
Close Battery Plant's contaminated site at certain and get Pb contaminated soil 20kg, in soil, the content of Pb is 358.4mg/kg, the NaCl leacheate adding 60L in this soil is put into blade leaching machine and is stirred drip washing 120min, the concentration of NaCl leacheate is 8mol/L and allocates pH value=4 with hydrochloric acid, drip washing terminates rear laboratory screen shaker and tentatively sieves, isolate the sand grains of particle diameter >0.2mm, the mud of <0.2mm is sent into laboratory room small-sized hydrocyclone and is separated further, screen out the silt particle of >25 μm, the Na of 1.2mol/L is added in the waste liquid of remaining≤25 μm
2cO
3carry out precipitation process, filter to isolate PbCO
3precipitation, the rear solution of filtration adds HCl and regulates pH to carry out villaumite regeneration.Carry out Pb content analysis to being separated rear sand grains, silt particle, ring waste and the regeneration leacheate after filtering, find that the Pb of in soil 88.6% is removed, in ring waste, the Pb of 99.1% is recovered.
Embodiment 3
Close Battery Plant's contaminated site at certain and get Pb contaminated soil 20kg, in soil, the content of Pb is 358.4mg/kg, the NaCl leacheate adding 120L in this soil is put into blade leaching machine and is stirred drip washing 120min, the concentration of NaCl leacheate is 8mol/L and allocates pH value=4 with hydrochloric acid, drip washing terminates rear laboratory screen shaker and tentatively sieves, isolate the sand grains of particle diameter >0.2mm, the mud of <0.2mm is sent into laboratory room small-sized hydrocyclone and is separated further, screen out the silt particle of >25 μm, the Ca (OH) of 0.8mol/L is added in the waste liquid of remaining≤25 μm
2carry out precipitation process, filter to isolate Pb (OH)
2precipitation, the rear solution of filtration adds HCl and regulates pH to carry out villaumite regeneration.Carry out Pb content analysis to being separated rear sand grains, silt particle, ring waste and the regeneration leacheate after filtering, find that the Pb of in soil 81.7% is removed, in ring waste, the Pb of 96.4% is recovered.
Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (8)
1. the elution circuit of a Pb contaminated soil, it is characterized in that: comprise leaching machine (1), vibratory sieve (2), hydrocyclone (3), sedimentation basin (4), pH regulating reservoir (5), described blade leaching machine (1) outlet is connected with vibratory sieve (2) entrance, described vibratory sieve (2) bottom is connected with described hydrocyclone (3) entrance, the top of described hydrocyclone (3) is connected with described sedimentation basin (4) top, described sedimentation basin (4) taphole is connected with described pH regulating reservoir (5) entrance, described pH regulating reservoir (5) outlet is connected with described leaching machine (1) entrance.
2. the elution circuit of Pb contaminated soil according to claim 1, is characterized in that: described leaching machine (1) is blade leaching machine (1).
3. the elution circuit of Pb contaminated soil according to claim 1 and 2, is characterized in that: described vibratory sieve (2) bottom is connected with described hydrocyclone (3) entrance by pipeline, pump.
4. the elution circuit of Pb contaminated soil according to claim 3, is characterized in that: the top of described hydrocyclone (3) is connected with described sedimentation basin (4) top by pipeline.
5. the elution circuit of the Pb contaminated soil according to any one of claim 1,2,3 or 4, is characterized in that: described pH regulating reservoir (5) outlet is connected with described leaching machine (1) entrance by pipeline, pump.
6. utilize the ELUTION METHOD of a kind of Pb contaminated soil of the elution circuit of the Pb contaminated soil described in claim 5, it is characterized in that: first Pb contaminated soil and NaCl leacheate are stirred in described leaching machine (1) and nurse one's health, send into described vibratory sieve (2) after conditioning tentatively to sieve, isolate the sand grains of particle diameter 0.2 ~ 2mm, the mud being less than 0.2mm is sent into described hydrocyclone (3) and is separated further, isolate the fine-grained soil of 25 μm ~ 0.2mm, remaining being less than in the screened stock of 25 μm adds Na
2cO
3or Ca (OH)
2carry out precipitation process at described sedimentation basin (4), after filtering, surplus solution carries out villaumite regeneration described pH regulating reservoir (5) by pH adjustment, and after regeneration, solution sends back to recycling in described leaching machine (1).
7. the ELUTION METHOD of Pb contaminated soil according to claim 6, is characterized in that: the liquid-solid ratio of described NaCl leacheate and contaminated soil is 6:1 ~ 1:1.
8. the ELUTION METHOD of Pb contaminated soil according to claim 6, is characterized in that: the concentration of described NaCl leacheate is 5 ~ 10mol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410568519.XA CN104289512A (en) | 2014-10-22 | 2014-10-22 | Leaching system for Pb-polluted soil and leaching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410568519.XA CN104289512A (en) | 2014-10-22 | 2014-10-22 | Leaching system for Pb-polluted soil and leaching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104289512A true CN104289512A (en) | 2015-01-21 |
Family
ID=52309591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410568519.XA Pending CN104289512A (en) | 2014-10-22 | 2014-10-22 | Leaching system for Pb-polluted soil and leaching method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104289512A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889150A (en) * | 2015-06-15 | 2015-09-09 | 武汉都市环保工程技术股份有限公司 | Technology for chemical leaching remediation of heavy metal polluted soil |
| CN105750316A (en) * | 2015-11-24 | 2016-07-13 | 北京建工环境修复股份有限公司 | Method for washing and remedying soil at different positions in engineering multi-level sieving manner |
| CN108080396A (en) * | 2017-12-14 | 2018-05-29 | 付朝品 | A kind of primary dregs regeneration method |
-
2014
- 2014-10-22 CN CN201410568519.XA patent/CN104289512A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889150A (en) * | 2015-06-15 | 2015-09-09 | 武汉都市环保工程技术股份有限公司 | Technology for chemical leaching remediation of heavy metal polluted soil |
| CN104889150B (en) * | 2015-06-15 | 2018-03-06 | 武汉都市环保工程技术股份有限公司 | The chemical leaching renovation technique of heavy-metal contaminated soil |
| CN105750316A (en) * | 2015-11-24 | 2016-07-13 | 北京建工环境修复股份有限公司 | Method for washing and remedying soil at different positions in engineering multi-level sieving manner |
| CN108080396A (en) * | 2017-12-14 | 2018-05-29 | 付朝品 | A kind of primary dregs regeneration method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103316907B (en) | Heavy-metal-polluted site soil leaching remediation method and device | |
| CN104889149B (en) | Ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil | |
| CN104475441B (en) | A kind of Soil leaching repair system and method thereof concentrating design concept based on decrement | |
| CN104984992B (en) | A kind of method that heavy-metal contaminated soil press filtration elution is repaired | |
| CN105268737B (en) | Heavy metal contaminated soil remediation equipment and remediation process thereof | |
| CN103316903B (en) | The chemical combined leaching repairing method of a kind of heavy-metal contaminated soil | |
| CN204148232U (en) | A kind of heavy-metal contaminated soil elution circuit | |
| CN104014583A (en) | Heavy metal polluted soil eluting and heavy metal concentrating method and equipment | |
| CN204247681U (en) | A kind of heavy-metal contaminated soil treatment facility | |
| CN105057340A (en) | Chromium-contaminated soil different-position leaching repairing technology and device | |
| Li et al. | Combined sieving and washing of multi-metal-contaminated soils using remediation equipment: A pilot-scale demonstration | |
| CN103861867A (en) | Elution-method soil remediation process | |
| CN104984986A (en) | Rapid environment-friendly heavy soil metal pollution treatment and purification system | |
| CN101985692A (en) | Method for removing arsenic and recycling tungsten from tungsten smelting wastewater | |
| CN103521512A (en) | Sepiolite-chitosan composite material capable of repairing soils containing lead and cadmium and preparation method thereof | |
| CN104190701A (en) | Leaching method for remediation of arsenic polluted soil by using magnetic separation | |
| CN103752599A (en) | Equipment and method for restoring heavy metal contaminated soil by combining leaching and electro-deposition | |
| CN104724876A (en) | Coal mine underground water processing method | |
| CN104275341B (en) | Treatment method for heavy metal polluted sediment | |
| CN105327773B (en) | The method for reclaiming nepheline ore deposit in nepheline ore deposit mine tailing | |
| CN104289512A (en) | Leaching system for Pb-polluted soil and leaching method | |
| CN204079666U (en) | One is applied to shale gas recirculation water circulation and stress treatment unit | |
| CN105903551A (en) | Environment-protective harmless one-time ecological restoration method for mine tailing | |
| CN204769857U (en) | Get rid of drip washing device of soil heavy metal | |
| CN204974702U (en) | Chromium -contaminated soil dystopy drip washing prosthetic devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150121 |
|
| WD01 | Invention patent application deemed withdrawn after publication |