CN106583436A - Leaching method for remediating hexavalent chromium contaminated soil - Google Patents
Leaching method for remediating hexavalent chromium contaminated soil Download PDFInfo
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- CN106583436A CN106583436A CN201611169911.2A CN201611169911A CN106583436A CN 106583436 A CN106583436 A CN 106583436A CN 201611169911 A CN201611169911 A CN 201611169911A CN 106583436 A CN106583436 A CN 106583436A
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- reduction
- hexavalent chromium
- elution method
- neutralization
- acidifying
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a leaching method for remediating hexavalent chromium contaminated soil. The method comprises the following steps: (1) slurrying the contaminated soil; (2) fully acidizing materials; (3) adding a reducing agent which is a mixture of calcium polysulfide and ferrite to reduce hexavalent chromium; (4) adding a neutralizing precipitant to precipitate trivalent chromium; and (5) separating solid and liquid, and preparing slurry through supernate. According to the method, a leaching agent and the leaching step are correspondingly simple and convenient to operate, high in safety, low in cost, high in hexavalent chromium recovering efficiency, and hard to cause secondary contamination; meanwhile, wastewater can be recycled, so that the requirement on water for leaching can be met, and as a result, the water resource can be greatly saved, and the secondary contamination caused by drained sewage can be avoided.
Description
Technical field
The present invention relates to field of environment engineering, in particular it relates to a kind of ELUTION METHOD of repairing hexavalent chromium polluted soil.
Background technology
Chromium is a kind of argenteous hard metal, is mainly occurred with crome metal, three kinds of forms of trivalent chromium and Cr VI.It is all
The compound of chromium is all toxic, and wherein Cr VI toxicity is maximum.Cr VI is the property swallowed poisonous substance/extremely toxic thing of imbedibility, and skin connects
Touching to cause sensitivity；More likely cause inherited genetic defects, suction to be potentially carcinogenic, have lasting danger to environment.Sexavalence
Chromium is easy to be absorbed by the body, and it can invade human body by digestion, respiratory tract, skin and mucosa.What harm was maximum be it is long-term or
There is carcinogenic danger when short term contact or suction.
At present, both at home and abroad for the recovery technique of hexavalent chromium polluted soil can substantially be divided three classes, i.e. electro reclamation, life
Thing is repaired and chemical redemption.The principle of electro reclamation is referred under electric field action, is incited somebody to action by EOF, electromigration and electrophoretic
Pollutant in soil take electric anode or electric negative electrode to, and so as to be separated, but electro reclamation is also in laboratory stage, at present
The demonstration project of scale is less in the world.To on a large scale electro reclamation is applied in Practical Project, in addition it is also necessary to enter one
The research and experiment of step.Biological restoration generally comprises microorganism remediation and phytoremediation, refers to using plant or microorganism to soil
Heavy metal in earth is extracted and is enriched with, and changes its chemical form by biological agent so as to fixed or removing toxic substances, and then is reduced
Harm of the heavy metal in soil, but repairing effect has certain limitation, for the contaminated soil remediation of chromium slag muck field class
It is not very applicable.Chemical restoration generally comprises curing/stabilizing and elution method, mainly by some chemistry of heavy metal
Reaction changes the existing forms of heavy metal in soil, and then reduces the ecological risk that heavy metal is caused, and adds such as in soil
Organic matter, chemical reagent, firming agent, natural minerals etc., or change the physicochemical properties such as the Eh of soil, pH value, oxidized can reduce,
Absorption, suppress, precipitation, the effect such as complexation chelating and antagonism reduce the biological effectiveness of heavy metal in soil, or with chemistry side
Method directly removes the heavy metal in soil, reaches reparation purpose.
In said method, chemical leaching method is to quote most commonly used method at present, and such as CN103521513A is disclosed
A kind of chemical leaching repairing method of hexavalent chromium polluted soil, the method add hydrochloric acid to be acidified in including contaminated soil, quiet
Put, reducing substanceses etc. are added in supernatant.Although the method can be to a certain degree
It is upper to administer hexavalent chromium polluted, but, the water consumption of the method is larger and easily causes secondarily polluted water.
Therefore, need badly for hexavalent chromium polluted soil research and development water consumption it is less, it is easy to operate, do not easily cause secondary pollution and
Hexavalent chromium polluted ELUTION METHOD in high efficiency removal soil.
The content of the invention
The purpose of the present invention be overcome the chemical leaching repairing method water consumption of existing hexavalent chromium polluted soil larger and
Easily cause the defect of secondarily polluted water, there is provided a kind of water consumption is low, easy to operate, safety is good, with low cost, removal efficiency
The method of repairing hexavalent chromium polluted soil that is high, not causing secondary pollution.
To achieve these goals, the present invention provides a kind of ELUTION METHOD of repairing hexavalent chromium polluted soil, concrete to adopt
Following step is realized：A hexavalent chromium polluted soil and dispersion liquid are mixed and made into serosity by (), the usage amount of the dispersion liquid causes institute
It is 500-600g/L to state the solid content in serosity；B the serosity is mixed by () with acidulant, the material after being acidified；
The usage amount of the acidulant causes the pH value of the material after the acidifying to be not higher than 4；C () adds in the material after the acidifying
Enter reducing agent and mix so that the hexavalent chrome reduction in material after the acidifying be trivalent chromium, the material after being reduced；Institute
State reducing agent and contain calcium polysulfide and ferrous salt, and calcium polysulfide and the mol ratio of ferrous salt are (1.5-5.5):1；Reducing agent
Addition causes Cr VI not higher than 15 weight % in the liquid phase of the material after reduction；(d) by the material after the reduction with
Neutralization precipitation agent mixes so that the trivalent chromium Precipitation in the liquid phase of the material after reduction, obtains the material after neutralization precipitation；
E material after the neutralization precipitation is carried out solid-liquid separation by (), obtain supernatant, and using the supernatant as the dispersion liquid
Part or all of return to step (a).
By above-mentioned technical proposal, eluent and rinsing step in the present invention are easy to operate, safety is good, cost
Cheap, hexavalent chromium removal efficiency high, secondary pollution is not easily caused, while waste water can be recycled, meet and drench scouring water, significantly
Water resource is saved, it is to avoid the secondary pollution of wastewater disposition.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 implements the elution circuit of the repairing hexavalent chromium polluted soil of the present invention
Description of reference numerals
1 hopper, 2 Bar strip type oscillating feeder
3 roller-type stone washing machine, 4 circular shale shaker
5 ball mill 6 disperses flow container
7 pulping agitator, 8 acid solution tank
The 9 acidifying reduction neutralization agitators of blender 10
11 reducing solution holding vessel, 12 neutralizer holding vessel
13 concentrator, 14 filter press
15 water treatment facilities
Specific embodiment
The following is and the specific embodiment of the present invention is described in detail.It should be appreciated that tool described herein
Body embodiment is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides a kind of ELUTION METHOD of repairing hexavalent chromium polluted soil, methods described can include following step
Suddenly：A hexavalent chromium polluted soil and dispersion liquid are mixed and made into serosity by (), during the usage amount of the dispersion liquid causes the serosity
Solid content is 500-600g/L；B the serosity is mixed by () with acidulant, the material after being acidified；The acidulant
Usage amount cause the pH value of the material after the acidifying to be not higher than 4；C () adds reducing agent simultaneously in the material after the acidifying
Mixing so that the hexavalent chrome reduction in material after the acidifying be trivalent chromium, the material after being reduced；The reducing agent contains
There are calcium polysulfide and ferrous salt, and calcium polysulfide and the mol ratio of ferrous salt are (1.5-5.5):1；The addition of reducing agent is caused
Content of 6-valence Cr ions in the liquid phase of the material after reduction is not higher than 15 weight %；D () is heavy with neutralization by the material after the reduction
Shallow lake agent mixing so that the trivalent chromium Precipitation in the liquid phase of the material after reduction, obtains the material after neutralization precipitation；E () will
Material after the neutralization precipitation carries out solid-liquid separation, obtains supernatant, and using the supernatant as the dispersion liquid portion
Divide or whole return to step (a).
By the technical scheme, eluent and rinsing step in the present invention are easy to operate, safety is good, low cost
Honest and clean, hexavalent chromium removal efficiency high, secondary pollution is not easily caused, while waste water can be recycled, meet and drench scouring water, save significantly
About water resource, it is to avoid the secondary pollution of wastewater disposition.
In above-mentioned technical proposal, in step (a), wet grinding can be carried out after hexavalent chromium polluted soil is mixed with dispersion liquid,
And serosity is made by wet grinding, the dispersion liquid contains water, can destroy the physical arrangement of dregs granule by the step so as to
In sour solvable state, oxidable state, reducible state and residual form by after medicament leaching more fully with subsequent step in reduction
Agent is reacted.
In above-mentioned technical proposal, in step (b), the acidulant includes dilute sulfuric acid, hydrochloric acid, ferrous sulfate, ferrous chloride
With at least one in organic acid, the mass percent of the dilute sulfuric acid is not higher than 70%；The consumption of acidulant causes the acid
The pH value of the material after change is 2-4, and the dilute sulfuric acid of the concentration used according to the invention can more easily control to adjust pH, and
And when pH value is between 2-4, Cr VI can be made fully to be leached, be conducive to chromic reduction reaction in subsequent step.
In above-mentioned technical proposal, in step (c), calcium polysulfide is preferably (2-4) with the mol ratio of ferrous salt:1.At this
Used in bright, the calcium polysulfide of the mol ratio is reduced sufficiently can Cr VI with the mixture of ferrous salt.Further to carry
High chromic reduction efficiency, in the step (c), the ferrous salt includes ferrous sulfate, ferrous chloride and Ferrous ammonium sulfate
In at least one；In the step (d), the neutralization precipitation agent includes calcium hydroxide, calcium oxide, calcium bicarbonate and Calcium Carbonate
In at least one.
In above-mentioned technical proposal, in step (d), the consumption of the neutralization precipitation agent causes the pH of the material after neutralization precipitation
It is worth for 7-8, under the pH value, chromic deposition efficiency is best.
In above-mentioned technical proposal, in step (e), the operation that the material after the neutralization precipitation carries out solid-liquid separation is passed through
Gravitational settling and/or filter carrying out.
In above-mentioned technical proposal, the ELUTION METHOD is carried out by elution circuit, and the elution circuit includes passing sequentially through thing
Soil pulping equipment, acidizing unit, reduction neutralizing device and solid-liquid separating equipment that material transfer passage is connected；The soil slurrying
Equipment is included for by the slurrying agitator (7) of hexavalent chromium polluted soil and dispersion liquid stirring pulping and for slurrying agitator
(7) the dispersion flow container (6) of dispersion liquid is provided；The acidizing unit includes what is mixed with acidulant for the serosity for obtaining slurrying
Acidifying blender (9) and the acid solution tank (8) for acidulant is provided to acidifying blender (9)；The reduction neutralizing device
Reducing solution holding vessel including reduction neutralization agitator (10) and for reducing agent is provided to reduction neutralization agitator (10)
(11) for the neutralizer holding vessel (12) to reduction neutralization agitator (10) the offer nertralizer.
In above-mentioned technical proposal, the solid-liquid separating equipment includes concentrator (13) and filter press (14), described dense
Close machine (13) be connected with the outlet of the reduction neutralization agitator, the underflow opening of the concentrator (13) pass through screw pump with it is described
Filter press (14) connects, and the concentrator (13) and the filter press (14) pass through water pump and water treatment facilities respectively
(15) connect.
The present invention is further described below in conjunction with the accompanying drawings, but not as a limitation of the invention.The drip washing in the present invention
Method is carried out by elution circuit, and lessivation is as follows：
Polluted Soil is dropped down onto on Bar strip type oscillating feeder (2) from discharging opening, rod Jing after equipment is filled to hopper (1)
Spacing is set to 8-10mm, and under the vibration of Bar strip type oscillating feeder (2), particle diameter uniformly enters more than the gravel of rod spacing
Expect to roller-type stone washing machine (3), add dispersion liquid by disperseing flow container (6) in roller-type stone washing machine；Gravel is connected in agitator
Continuous helical blade rolling, the mutual rubbing action between pushing and gravel, the pollutant that gravel surface is loosely adsorbed are eluted entrance
Dispersion liquid, being then pumped to slurrying agitator (7) carries out subsequent treatment；Particle diameter is less than the material of rod spacing from the sky between rod
Gap falls, and is separated, into circular shale shaker (4).
The aperture of circular shale shaker screen cloth is set to 2mm, Jing after circular shale shaker (4) screening, thing of the particle diameter less than mesh size
Material falls in slurrying agitator (7) and carries out slurrying；Particle diameter is fed to ball mill (5) more than the material of mesh size, polished
Fines from overfall discharge, be then sent to after blended dispersion liquid in slurrying agitator (7)；Now, slurrying agitator pair
Fines from circular shale shaker and ball mill carries out slurrying, washes stone waste water and Jing water process from roller-type stone washing machine (3) with water
Recycle-water after equipment (15) purified treatment, and in serosity, the content of solid content is less than 100g/L.
After slurrying terminates, serosity Jing pumping of screw pump delivers to acidifying blender (9), and acid solution tank (8) is thrown in acidifying blender
Enter acid solution, the pH value for adjusting serosity is acidity, and Optimal pH is between 2-4；Serosity Jing screw pumps after being fully acidified are sent to also
Former neutralization agitator (10), while reducing agent is added by reducing solution holding vessel (11) into reduction neutralization agitator (10), also
Former agent is the mixed solution of calcium polysulfide and ferrous salt, and the calcium polysulfide is (1.5-5.5) with the mol ratio of ferrous salt：1, stir
30-60 minutes are mixed, the Cr (VI) in acidifying rear slurry is reduced into into Cr (III).After fully reducing, neutralized liquid holding vessel
(12) into pond adding nertralizer etc. to adjust pH precipitates Cr (III) for 7-8, and nertralizer is calcium hydroxide, calcium oxide, bicarbonate
At least one in calcium and calcium carbonate soln, after stirring 30 minutes, serosity is pumped to concentrator (13).
Concentrator (13) is separated to solid-liquid using the effect of its gravitational settling, and the underflow after sedimentation concentration is by being installed on
The effect of the rake of microrunning (1/3～1/5 rev/min) in concentrator, makes the underflow mud of thickening by the bottom of dense motor spindle
Head piece draws off.Underflow opening connecting screw rod pump, screw pump will concentrate mud and push into filter press (14), enter to concentrating mud
Row filter-press dehydration, moisture enter water treatment facilities Jing after filter-cloth filtering, and cosmid filter pressing is into mud cake realizing minimizing.Concentrator revolves
The supernatant liquid for stopping isolating is pumped to water treatment facilities (15) using water pump, carries out subsequent treatment.
Water treatment facilities (15) meet water body purification after III class water standard of standard (GB/T14848-93), are pumped to water
Tank, reuse is to the elution circuit again.
Embodiment 1
By taking the chromium salt factory of Gansu as an example, dystopy drip washing process, concrete technology flow process and reparation effect are carried out to chromium-polluted soil
Fruit is as follows：
Jing Site Detections, soil pH 7.2～8.8 or so, hexavalent chromium polluted concentration range be 534.70～
17883.2mg/kg.For the higher containing chromium slag contaminated soil of this kind of sour solvent content of 6-valence Cr ions, reducing agent, nertralizer are only provided
Cannot thoroughly detoxify, the physical arrangement that wet grinding destroys dregs granule must be carried out so as in sour solvable state, oxidable state, can also
Ortho states and residual form are more fully reacted with reduction medicament after being leached by medicament.
Contaminated soil is transported to into dystopy treatment region, and contaminated soil is filled to hopper (1), Bar strip type is dropped down onto from discharging opening and shaken
Dynamic batcher (2), rod spacing are 10mm, enter the gravel more than 10mm and add in roller-type stone washing machine (3) dispersion liquid cleaning,
Dispersion liquid after cleaning is pumped to slurrying agitator (7) subsequent treatment.Enter from rod gap less than the unclassified stores of 10mm particle diameters
Enter circular shale shaker (4) to be sieved, wherein the mesh size of the circular shale shaker is 2mm, screen area is 6.1m2, compass screen surface 2
Layer；Material after screening less than 2mm particle diameters is entered in slurrying agitator (7), enters ball mill (5) more than the material of 2mm particle diameters
Grinding, is pumped in pulper after the blended dispersion liquid of the fines after grinding, the same slurrying of polished powder.Herein, sieve
Timesharing soil moisture content must not exceed 30%.
After slurrying terminates, serosity Jing pumping of screw pump delivers to acidifying blender (9), and Jing acid solutions tank manually adds concentration for 60 weights
The dilute sulfuric acid of amount % is 3 and to stir to pH value, solubility Cr VI is fully leached under conditions of acidity.
Serosity Jing screw pumps after being fully acidified are sent to reduction neutralization agitator (10), while to reduction neutralization agitator
Interior every kilogram of contaminated soil adds 1000L reductant solutions (concentration is 0.05g/L), and the reducing agent is calcium polysulfide, sulphuric acid
Ferrous mixture, and the mol ratio of calcium polysulfide, ferrous sulfate is 4：1；By acidifying rear slurry in hexavalent chrome reduction into
Trivalent chromium, and the hexavalent chromium concentration in adding procedure in sampling and testing liquid phase, when in liquid phase, content of 6-valence Cr ions is less than 0.05mg/
Stop adding reducing agent during L, mixing time is 45 minutes.
After fully reducing, neutralized liquid holding vessel (12) is gradually added into calcium hydroxide to (10) in reduction neutralization agitator
Powder solid, adjusts pH to 7, precipitates trivalent chromium；It is again stirring for about 30 minutes, serosity is pumped to concentrator (13), carries out
Solid-liquid separation；Then solid is dehydrated and volume reduction into filter press (14)；Sewage and concentrator rotation that filter press goes out
Stop the supernatant liquid isolated, pump to water treatment facilities (15), carry out purified treatment, the water after purified treatment meets mark
After accurate (GB/T14848-93) III class water standard, then the water after the purified treatment is reused as dispersion liquid.
By adopting, " soil sieves pretreatment-mechanical-physical crushing-material acidifying-hexavalent chrome reduction removing toxic substances-neutralization
After precipitation-solid-liquid separation " method is repaired to contaminated soil, its hexavalent chromium concentration is by initial 534.70-
17883.2mg/kg is down to 0.32-1.57mg/kg, and in soil, chromic removal efficiency can reach 99%, the sexavalence after reparation
Chromium concn is not higher than《Place soil environmental risk assessment screening value》Middle residential land standard, i.e. 30mg/kg, and its Cr VI and
Total chromium leaching concentration is down to respectively<0.05mg/L and<0.15mg/L, is below《Chromium slag contaminated Environment control resist technology specification》
In (provisional) (HJ/T 301-2007), chromium slag is used as roadbed material and Environmental capacity index limits during aggregate, that is, press
According to《Solid waste Leaching leaching method-sulfonitric method》Cr VI in leachate prepared by (HJ/T 299-2007)≤
0.5mg/L, total chromium≤1.5mg/L.And the eluent that this method is adopted is (1.5-5.5) for mol ratio：1 calcium polysulfide and Asia
The mixture of iron salt, wherein calcium polysulfide are (2-4) with the mol ratio of ferrous salt：There is when 1 more preferable reduction effect, combine
When ferrous salt is used alone, the chromic response time is short, and chromic high removal efficiency when calcium polysulfide is used alone, tool
Have the advantages that easy to operate, safety is good, with low cost, removal efficiency is high, do not cause secondary pollution, to hexavalent chromium polluted soil
Reparation it is highly effective.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, various letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The compound mode of energy is no longer separately illustrated.
Additionally, combination in any between a variety of embodiments of the present invention, can also be carried out, as long as which is without prejudice to this
The thought of invention, which should equally be considered as content disclosed in this invention.
Claims (10)
1. a kind of ELUTION METHOD of repairing hexavalent chromium polluted soil, it is characterised in that the method comprising the steps of：
A hexavalent chromium polluted soil and dispersion liquid are mixed and made into serosity by (), during the usage amount of the dispersion liquid causes the serosity
Solid content be 500-600g/L；
B the serosity is mixed by () with acidulant, the material after being acidified；The usage amount of the acidulant causes the acidifying
The pH value of material afterwards is not higher than 4；
C () adds reducing agent in the material after the acidifying and mixes so that the Cr VI in material after the acidifying is also
Originally it was trivalent chromium, the material after being reduced；The reducing agent contains calcium polysulfide and ferrous salt, and calcium polysulfide and ferrous salt
Mol ratio be (1.5-5.5):1；The addition of reducing agent cause reduce after material liquid phase in Cr VI be not higher than 15
Weight %；
D material after the reduction is mixed by () with neutralization precipitation agent so that the trivalent chromium in the liquid phase of the material after reduction sinks
Precipitation goes out, and obtains the material after neutralization precipitation；
E material after the neutralization precipitation is carried out solid-liquid separation by (), obtain supernatant, and using the supernatant as described point
The part or all of return to step (a) of dispersion liquid.
2. ELUTION METHOD according to claim 1, wherein, in step (a), hexavalent chromium polluted soil is mixed with dispersion liquid
After carry out wet grinding, and serosity is made by wet grinding；The dispersion liquid contains water.
3. ELUTION METHOD according to claim 1, wherein, in step (b), the acidulant includes dilute sulfuric acid, hydrochloric acid, sulfur
At least one in sour ferrous, ferrous chloride and organic acid, the mass percent of the dilute sulfuric acid are not higher than 70%；Acidulant
It is 2-4 that consumption causes the pH value of the material after the acidifying.
4. ELUTION METHOD according to claim 1, wherein, in step (c), calcium polysulfide with the mol ratio of ferrous salt is
(2-4):1。
5. the ELUTION METHOD according to claim 1 or 4, wherein, in step (c), the ferrous salt includes ferrous sulfate, chlorine
Change at least one in ferrous and Ferrous ammonium sulfate.
6. ELUTION METHOD according to claim 1, wherein, in step (d), the neutralization precipitation agent include calcium hydroxide,
At least one in calcium oxide, calcium bicarbonate and Calcium Carbonate.
7. the ELUTION METHOD according to claim 1 or 6, wherein, in step (d), the consumption of the neutralization precipitation agent is caused
The pH value of the material after neutralization precipitation is 7-8.
8. ELUTION METHOD according to claim 1, wherein, in step (e), the material after the neutralization precipitation is carried out solid
The detached operation of liquid is carried out by gravitational settling and/or filtration.
9. ELUTION METHOD according to claim 1, wherein, the ELUTION METHOD is carried out by elution circuit, the drip washing system
System includes soil pulping equipment, acidizing unit, reduction neutralizing device and the solid-liquid separation for passing sequentially through material conveying passage connection
Equipment；The soil pulping equipment is included for by the slurrying agitator (7) of hexavalent chromium polluted soil and dispersion liquid stirring pulping
With for slurrying agitator (7) provide dispersion liquid dispersion flow container (6)；The acidizing unit is included for slurrying is obtained
The acidifying blender (9) that serosity is mixed with acidulant and the acid solution tank for acidulant is provided to acidifying blender (9)
(8)；The reduction neutralizing device includes reduction neutralization agitator (10) and for providing to reduction neutralization agitator (10)
The reducing solution holding vessel (11) of reducing agent is for the neutralizer holding vessel to reduction neutralization agitator (10) the offer nertralizer
(12)。
10. ELUTION METHOD according to claim 9, wherein, the solid-liquid separating equipment includes concentrator (13) and sheet frame
Pressure filter (14), the concentrator (13) are connected with the outlet of the reduction neutralization agitator, the underflow of the concentrator (13)
Mouth is connected with the filter press (14) by screw pump, and the concentrator (13) and the filter press (14) lead to respectively
Cross water pump to be connected with water treatment facilities (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611169911.2A CN106583436A (en) | 2016-12-16 | 2016-12-16 | Leaching method for remediating hexavalent chromium contaminated soil |
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|---|---|---|---|
| CN201611169911.2A CN106583436A (en) | 2016-12-16 | 2016-12-16 | Leaching method for remediating hexavalent chromium contaminated soil |
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| CN107214186A (en) * | 2017-08-07 | 2017-09-29 | 北京高能时代环境技术股份有限公司 | A kind of renovation technique of chromyl contaminated soil |
| CN107297386A (en) * | 2017-07-25 | 2017-10-27 | 上海第二工业大学 | A kind of mechanochemistry reduction restorative procedure of hexavalent chromium polluted soil |
| CN108555007A (en) * | 2018-03-28 | 2018-09-21 | 中冶华天工程技术有限公司 | The reduction of soil-repairing agent and hexavalent chromium polluted soil stabilizes restorative procedure |
| CN108941173A (en) * | 2018-05-31 | 2018-12-07 | 河北科技大学 | The elution extracting method of soil Cr VI |
| CN109647873A (en) * | 2018-11-29 | 2019-04-19 | 河南大学 | One kind to pollution farming land in biologically effective state Cr(VI) passivating method |
| CN110369471A (en) * | 2019-09-05 | 2019-10-25 | 中国科学院过程工程研究所 | A kind of method of chromium-polluted soil reparation |
| CN110665960A (en) * | 2019-11-15 | 2020-01-10 | 安徽国祯环境修复股份有限公司 | Chemical leaching remediation process for chromium-contaminated soil |
| CN111718718A (en) * | 2020-04-16 | 2020-09-29 | 福建省环境保护设计院有限公司 | Repairing agent for repairing hexavalent chromium-polluted soil and method for repairing hexavalent chromium-polluted soil by using repairing agent |
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| CN114192565A (en) * | 2021-11-30 | 2022-03-18 | 广东省农业科学院农业资源与环境研究所 | Novel method for repairing heavy metal cadmium, arsenic, mercury, lead and chromium composite contaminated soil |
| CN114192565B (en) * | 2021-11-30 | 2023-09-08 | 广东省农业科学院农业资源与环境研究所 | Novel method for repairing heavy metal cadmium, arsenic, mercury, lead and chromium composite contaminated soil |
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| CN115006776A (en) * | 2022-07-06 | 2022-09-06 | 中南大学 | Combined treatment method for leaching, detoxifying and mineralizing stable chromium-containing hazardous waste |
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