CN106734169A - The processing method and processing equipment of repairing hexavalent chromium polluted soil - Google Patents
The processing method and processing equipment of repairing hexavalent chromium polluted soil Download PDFInfo
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- CN106734169A CN106734169A CN201611238058.5A CN201611238058A CN106734169A CN 106734169 A CN106734169 A CN 106734169A CN 201611238058 A CN201611238058 A CN 201611238058A CN 106734169 A CN106734169 A CN 106734169A
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- pulper
- processing method
- slurries
- hexavalent chromium
- water
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
-
- 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
Abstract
The invention discloses a kind of processing method and processing equipment of repairing hexavalent chromium polluted soil, the processing equipment includes oscillating feeder, stone scrubber, vibratory sieve, ball mill, pulper, regulating reservoir, stirring pool, concentrator, plate and frame filter press, water treatment facilities, and processing method comprises the following steps：1) by contaminated soil through vibrosieve or milled processed, 2) material is sent into pulper slurrying；3) regulating reservoir is then sent through, and adjusts pH value to 24,4) slurries are sent into stirring pool, slurries is formed chromium hydroxide precipitation, regulation pH value to 68；5) separation of solid and liquid, filter-press dehydration are carried out, mud cake is formed.Present device stable and reliable operation, convenient disassembly, drip washing works well；Waste water is used through processing Posterior circle, can meet roller-type stone washing machine and pulper water, greatlys save water resource, it also avoid the secondary pollution that wastewater disposition is caused；The drip washing recovery project of other heavy-metal contaminated soils is can also be used for, the service efficiency of equipment is improve.
Description
Technical field
The invention belongs to heavy-metal contaminated soil repairing and treating technical field, and in particular to be a kind of dirty repairing hexavalent chromium
Contaminate the processing method and processing equipment of 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 may cause sensitivity；Inherited genetic defects are more likely caused, suction is potentially carcinogenic, there is 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 mucous membrane.Harm it is maximum be it is long-term or
There is carcinogenic danger when short term contact or suction.
At present, the recovery technique both at home and abroad for chromium-polluted soil can be substantially divided three classes, i.e., electro reclamation, biology are repaiied
Multiple, chemical remediation,.The principle of electro reclamation refers under electric field action, by EOF, electromigration and electrophoretic by soil
In pollutant take electric anode or electric negative electrode to, so as to be separated, but electro reclamation is also in laboratory stage, international at present
The demonstration project of upper scale is less.In electro reclamation is applied to Practical Project on a large scale, in addition it is also necessary to further
Research and experiment.It is biological prosthetic to generally comprise microorganism remediation and phytoremediation, refer to in soil using plant or microorganism
Heavy metal extracted and be enriched with, its chemical form is changed by biological agent, it is fixed or is detoxified, and then reduce a huge sum of money
Belong to harm in soil, but repairing effect has certain limitation, for chromium slag muck class contaminated soil remediation not
It is very applicable.
Chemical restoration generally comprises curing/stabilizing, elution method and chemical reduction method, mainly by the one of heavy metal
A little chemical reactions change the existing forms of heavy metal in soil, and then reduce the ecological risk that heavy metal is caused, such as to soil
Middle addition organic matter, chemical reagent, curing agent, natural minerals etc., or change the physicochemical properties such as Eh, the pH value of soil, can be through oxygen
Change the biological effectiveness of the effect reduction heavy metal in soil such as reduction, absorption, suppression, precipitation, complexing chelating and antagonism, Huo Zheyong
Chemical method directly removes the heavy metal in soil, reaches reparation purpose, and the method repairing effect is substantially, economic and practical, has
Very strong marketing, the high density pollution soil remediation particularly with chromium slag muck class is more applicable.
The content of the invention
The technical problems to be solved by the invention are to provide processing method and the treatment of a kind of repairing hexavalent chromium polluted soil
Equipment, realizes easy to operate, stable, saving energy consumption and removal efficiency treatment effect high.
The present invention solves above-mentioned technical problem with following technical scheme：
The processing method of the repairing hexavalent chromium polluted soil of the present invention, including following operating procedure：
1) contaminated soil is carried out into vibrosieve or milled processed, to form material of the particle diameter less than 2mm, and controls soil
Moisture content is no more than 30%；
2) material by particle diameter less than 2mm sends into pulper slurrying；
3) slurries that will be obtained are sent to regulating reservoir, and adjust the pH value of slurries to 2-4, it is fully acidified；
3) slurries after acidifying are sent into stirring pool, and adds the mixed solution of calcium polysulfide and ferrous salt, after making acidifying
Cr (VI) in slurries is fully reduced into Cr (III), and slurries is formed chromium hydroxide precipitation, while pH value is adjusted to 6-8, then
Slurries are delivered into concentrator treatment；
4) separation of solid and liquid is carried out to slurries by concentrator, the underflow mud feeding sheet frame liquid filter of thickening is carried out into press filtration
Dehydration, forms mud cake.
Step 1) in, the vibrosieve is sieved including two-stage vibration, and first order vibrosieve is that particle separation diameter is less than
The material of 10mm, the material by particle diameter less than 10mm sends into second level vibrosieve, and the material feeding by particle diameter more than 10mm is washed
Stone machine carries out wash-out treatment, and second level vibrosieve is material of the particle separation diameter less than 2mm, and the material by particle diameter less than 2mm is straight
Pick slurrying in pulper；The milled processed is the material feeding ball mill treatment more than 2mm by particle diameter, to obtain particle diameter
Material less than 2mm, and the slurrying in sending into pulper after adding appropriate moisture.
Concentrator is revolved the material moisture after the supernatant liquid and the treatment of sheet frame liquid filter for stopping isolating through filter-cloth filtering
Feeding water treatment facilities carry out water treatment afterwards, after making that water body purification is up to standard and meeting reuse requirement, in feeding water pot, to be supplied to
Pulper and stone scrubber, the leacheate after being processed through stone scrubber wash-out are delivered in pulper again.
The collocation method of the mixed solution of the calcium polysulfide and ferrous salt is：By calcium polysulfide and green vitriol
In mass ratio it is 4:6 mixing are stirred in being put into water, and the mass concentration of two material summations is reached 50%, are completely cut off after stirring
Air is sealed up for safekeeping.
Analysis pure level product of the green vitriol from content up to 99%, the calcium polysulfide selects technical grade
Calcium polysulfide product.
Step 3) in, after the mixed solution of addition calcium polysulfide and ferrous salt, stir 60 minutes, after waiting fully reduction, then
To adding stabilization agent molysite or calcium salt slurries is formed chromium hydroxide precipitation in stirring pool, then it is stirred for 30 minutes.
The processing equipment of the repairing hexavalent chromium polluted soil of the present invention, including oscillating feeder, stone scrubber, vibratory sieve, ball milling
Machine, pulper, regulating reservoir, stirring pool, concentrator, plate and frame filter press, water treatment facilities, vibrating feed function particle separation diameter are less than
The material of 10mm, material of the vibratory sieve energy particle separation diameter less than 2mm, the small material outlet in bottom and the vibratory sieve phase of oscillating feeder
Connect, the big material outlet in side of oscillating feeder connects with stone scrubber, the small material outlet in bottom of vibratory sieve connects with pulper,
The big material outlet in side of vibratory sieve connects with ball mill, and the outlet of ball mill connects with pulper；The slurries of pulper go out
Mouth connects with regulating reservoir, and the outlet of regulating reservoir connects with stirring pool, the outlet connection concentrator of stirring pool, the thickening mud of concentrator
Slurry outlet connection plate and frame filter press, the liquid outlet of plate and frame filter press and the liquid outlet connection water treatment facilities of concentrator, water
The outlet of processing equipment connects water pot by the road, and water pot connects pulper and stone scrubber by the road, between stone scrubber and pulper
Also it is connected to slurries transfer pipeline.
The entrance connection hopper of the oscillating feeder.
The regulating reservoir is connected by the road with sour tank, to facilitate the material of input regulation pH value.
The stirring pool is connected by the road with pharmacy jar, alkali liquid tank, to facilitate input for the medicament and use of precipitation
In the material of regulation pH value.
The eluent that the inventive method is used is ferrous salt and the mixture of calcium polysulfide, ferrous salt and calcium polysulfide by
In having the advantages that easy to operate, security is good, with low cost, removal efficiency is high, do not cause secondary pollution, and whole equipment
Design there is stable and reliable operation, convenient disassembly again, drip washing such as works well at the advantage；And waste water makes through processing Posterior circle
With, roller-type stone washing machine and pulper water can be met, water resource is greatlyd save, it also avoid the secondary dirt that wastewater disposition is caused
Dye；Meanwhile, the equipment is improved appropriately and adjusted, it may also be used for work is repaired in the drip washing of other heavy-metal contaminated soils
Journey, considerably increases the service efficiency of equipment.
Brief description of the drawings
Fig. 1 is that the attachment structure and processing technological flow of the processing equipment of repairing hexavalent chromium polluted soil of the invention are illustrated
Figure.
In figure：Hopper 1, Bar strip type oscillating feeder 2, roller-type stone washing machine 3, circular shale shaker 4, ball mill 5, water pot 6, system
Pulp grinder 7, sour tank 8, regulating reservoir 9, stirring pool 10, pharmacy jar 11, alkali liquid tank 12, concentrator 13, plate and frame filter press 14, water process set
Standby 15.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples, but not as a limitation of the invention.
As shown in figure 1, the processing equipment of repairing hexavalent chromium polluted soil of the invention including hopper 1, Bar strip type vibrate to
Material machine 2, roller-type stone washing machine 3, circular shale shaker 4, ball mill 5, water pot 6, pulper 7, sour tank 8, regulating reservoir 9, stirring pool 10, medicament
Tank 11, alkali liquid tank 12, concentrator 13, plate and frame filter press 14, water treatment facilities 15.The outlet of hopper 1 and Bar strip type vibrate to
Material machine 2 is connected, and the bottom of Bar strip type oscillating feeder 2 is connected with circular shale shaker 4, and the discharging opening of side is connected with roller-type stone washing machine 3；
The bottom of circular shale shaker 4 is connected with pulper 7, and the discharging opening of side is connected with ball mill 5；The grout outlet of pulper 7 and regulating reservoir 9
Connection, the top of regulating reservoir 9 is connected with sour tank 8；The grout outlet of regulating reservoir 9 is connected with stirring pool 10, the top of stirring pool 10 and medicament
Tank 11 and alkali liquid tank 12 are connected, and its bottom grout outlet is connected with concentrator 13；The supernatant liquor discharge outlet and Shui Chu of concentrator 13
Reason equipment 15 is connected, and the outlet at bottom of concentrator 13 is connected with sheet frame liquid filter 14；The delivery port and water process of sheet frame liquid filter 14
Equipment 15 is connected, water treatment facilities 15 purify after delivery port be connected with water pot 6, water pot 6 by the road with roller-type stone washing machine 3 and make
Pulp grinder 7 is connected, and the drip washing serum outlet of roller-type stone washing machine 3 is connected with pulper 7 by the road.
Bar strip type oscillating feeder 2 of the present invention should be adjusted to 10mm rod spacing, 0 ° of its blind plate inclination angle, and rod inclines
10 ° of angle, 45 ° of vibrating direction angle, maximum material size 400mm.
The circular shale shaker mesh size is 2mm, cover surface 6.1m2, 2 layers of the compass screen surface number of plies, the maximum feed length of side
200mm。
Agitator inside stirring pool of the present invention is Double shaft stirring, the blade point of each agitating shaft in the vertical direction
Multilayer is arranged, and 3 blades of every layer of horizontal setting, the blade dimensions size and angle of inclination above same agitating shaft is identical.
In the course of work, an agitating shaft turns clockwise, and another agitating shaft does rotate counterclockwise, but velocity of rotation is identical, turns round
Square is identical, to form vortex in opposite direction.
Water treatment facilities of the present invention can by three-level inclined-plate clarifying basin (containing flocculation and help solidifying medicament add-on system),
Quartz sand filter tank and activated carbon adsorption tank are constituted, and reuse standard can be met after making water treatment.
The course of work using the repairing hexavalent chromium polluted soil of above-mentioned processing equipment is as follows：
After Polluted Soil is filled into hopper through equipment, dropped down onto on Bar strip type oscillating feeder from discharging opening, in Bar strip type
Under the vibration of oscillating feeder, more than 10mm particle diameters gravel uniform feeding to 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
Drip washing slurries, then carry out subsequent treatment by being pumped to pulper；Material less than 10mm particle diameters falls from the space between rod,
It is separated, into circular shale shaker.
Circular shale shaker mesh size is 2mm, and after being sieved through vibratory sieve, falling into pulper less than the material of 2mm particle diameters is carried out
Slurrying；Fed to ball mill more than the material of 2mm particle diameters, polished fines is discharged from overfall, and its particle diameter is less than 2mm,
The appropriate moisture of mixing, is then equally sent in pulper；Now, pulper is to the fines from circular shale shaker and ball mill
Slurrying is carried out, stone waste water is washed and through the recycle-water after water treatment facilities purified treatment from roller-type stone washing machine with water.
After slurrying terminates, slurries deliver to regulating reservoir through pumping of screw pump, and regulating reservoir top is connected with sour tank, and control is sour to be added
Amount, to adjust the pH value of slurries between 2-4；Slurries fully after acidifying are sent to stirring pool through screw pump, while to stirring
The mixed solution of calcium polysulfide and ferrous salt is added in pond, the Cr (VI) being acidified in rear slurry Cr (III) is reduced into, during stirring
Between be 60 minutes, after after fully reduction, by pharmacy jar 11 to adding stabilization agent molysite, calcium salt etc. to form slurries in pond
Chromium hydroxide precipitation, and add NaOH to adjust by alkali liquid tank 12 to mix solution ph in pond and, to 6-8, be again stirring for about 30 points
Zhong Hou, slurries are pumped to concentrator.
Concentrator is separated using the effect of its gravitational settling to solid-liquid, and the underflow after sedimentation concentration is dense by being installed on
The effect of the rake of microrunning (1/3~1/5r/min) in machine, makes the underflow mud of thickening be unloaded by the underflow opening of dense motor spindle
Go out.Underflow opening connecting screw rod pump, screw pump will concentrate mud and push and enter sheet frame liquid filter, and carrying out press filtration to concentration mud takes off
Water, moisture enters water treatment facilities after filter-cloth filtering, and clay press filtration is into mud cake realizing minimizing.Concentrator rotation stops isolating
Supernatant liquid pumped to water treatment facilities using water pump, carry out subsequent treatment.
The collocation method of the mixed solution of calcium polysulfide of the present invention and ferrous salt is：Technical grade calcium polysulfide is produced
Product (content 45%) are 4 with green vitriol (analyzing pure, content 99%) in mass ratio:6 mixing are put into water, two materials
The mass concentration of summation is 50%, air is completely cut off after stirring and is sealed up for safekeeping.
The ferrous salt, calcium polysulfide and Cr VI reaction ionic equation be：
Ferrous salt：Cr2O7 2-+6Fe2++14H+=2Cr3++6Fe3++7H2O
Calcium polysulfide：Cr2O7 2-+3S2-+14H+=2Cr3++3S+7H2O
The present invention makes slurries form chromium hydroxide precipitation, its cardinal principle from stabilization agent molysite, NaOH etc.
It is as follows：
2Na++CrO4 2-→Na2CrO4Ksp=7.1x 10-4
xFe3++yCr3++OH-→FexCry(OH)3
Cr3++OH-→Cr(OH)3
The following is concrete application example of the invention：
Embodiment 1
By taking the chromium salt factory of Gansu as an example, using the above method to low concentration (Cr (VI) pollution concentration<1000mg/kg) chromium is dirty
Dye soil carries out dystopy drip washing treatment, and concrete technology flow process and repairing effect are as follows：
After testing, soil pH is 214.30~786.7mg/kg in 7.2~8.8 or so, Cr (VI) pollution concentrations scope.Pin
To the containing chromium slag contaminated soil of this kind of sour solvent Cr (VI) content, only providing reduction stabilization agent cannot thoroughly detoxify, and must enter
Row wet-milling destroys the physical arrangement of dregs particle, makes sour solvable state therein, oxidable state, reducible state and residual form by medicament
More fully reacted with reduction medicament after leaching.
Contaminated soil is transported to dystopy treatment region, contaminated soil enters Bar strip type oscillating feeder, and removal particle diameter is more than
The gravel of 10mm.Material less than 10mm particle diameters enters circular shale shaker, and its mesh size is 2mm, thing of the particle diameter in 2mm-10mm
Material is ground into ball mill, and pulper slurrying is fallen into less than the material of 2mm particle diameters.It is maximum through the powder after ball mill grinding
Particle diameter is about 3mm-5mm, is equally sent to pulper.Herein, soil moisture content must not exceed 30% during screening.In addition, slurrying
After end, slurries deliver to regulating reservoir (high 2 meters, about 3 meters of diameter, 14m through pumping of screw pump3Left and right volume), with acid at the top of regulating reservoir
Tank is connected, and addition technical grade (content 50%) sulfuric acid 100L is sufficiently stirred for, and makes soluble Cr (VI) abundant under conditions of acidity
Leach, optimal pH value is controlled between 2-4.Slurries fully after acidifying are sent to stirring pool through screw pump, while to stirring
The mixed solution that calcium polysulfide and ferrous salt are added in pond is mixed, the Cr (VI) being acidified in rear slurry is reduced into Cr (III), and
Cr (VI) concentration in adding procedure in sampling and testing liquid phase, dosing is stopped when liquid phase Cr (VI) concentration is less than 0.05mg/L,
Mixing time is 60 minutes.After fully reduction after, alkali liquid tank in pond add sodium hydroxide solution 250L (content 40%), by pH
Value is adjusted to 6-8, Cr (III) is precipitated completely, is again stirring for about 30 minutes, and slurries are pumped to concentrator, carry out separation of solid and liquid；
It is dehydrated subsequently into plate and frame filter press and volume reduction；The sewage and concentrator rotation that plate compression goes out stop the upper strata clarification isolated
Liquid, pumps to water treatment facilities, carries out purified treatment.
By using " soil sieves pretreatment-mechanical-physical crushing-material acidifying-Cr (VI) reduction and detoxication-stabilization
After change-separation of solid and liquid " technique is repaired to contaminated soil, its hexavalent chromium concentration is by 214.30 initial~786.7mg/
Kg is down to 1.57mg/kg -0.32mg/kg, and Cr (VI) concentration after reparation 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 are down to respectively<0.05mg/L and<
0.15mg/L, is below《Chromium slag contaminated Environment control protection technique specification》Chromium slag is used as in (provisional) (HJ/T 301-2007)
Environmental capacity index limits when roadbed material and aggregate, i.e., according to《Solid waste Leaching leaching method-sulphur
Acid+nitric acid method》Cr (VI)≤0.5mg/L, total chromium≤1.5mg/L in leachate prepared by (HJ/T 299-2007).According to the party
Total lattice and hexavalent chromium concentration are satisfied by the requirement of existing national standards in soil and its leachate after method reparation.
Embodiment 2
By taking the chromium salt factory of Gansu as an example, using above method centering concentration (1000mg/kg<Cr (VI) pollution concentration<
5000mg/kg) chromium-polluted soil carries out dystopy drip washing treatment, and concrete technology flow process and repairing effect are as follows：
After testing, soil pH is 1245.3~4866.5mg/kg in 7.2~8.8 or so, Cr (VI) pollution concentrations scope.
For this kind of sour solvent Cr (VI) content containing chromium slag contaminated soil higher, only providing reduction stabilization agent cannot thoroughly solve
Poison, must carry out the physical arrangement that wet-milling destroys dregs particle, make sour solvable state therein, oxidable state, reducible state and residue
State is more fully reacted after being leached by medicament with reduction medicament.
Contaminated soil is transported to dystopy treatment region, contaminated soil enters Bar strip type oscillating feeder, and removal particle diameter is more than
The gravel of 10mm.Material less than 10mm particle diameters enters circular shale shaker, and its mesh size is 2mm, thing of the particle diameter in 2mm-10mm
Material is ground into ball mill, and pulper slurrying is fallen into less than the material of 2mm particle diameters.It is maximum through the powder after ball mill grinding
Particle diameter is about 3mm-5mm, is equally sent to pulper.Herein, soil moisture content must not exceed 30% during screening.In addition, slurrying
After end, slurries deliver to regulating reservoir (about 3 meters of diameter, 14m through pumping of screw pump3Left and right volume), regulating reservoir top is connected with sour tank,
Addition technical grade (content 50%) sulfuric acid 110L is sufficiently stirred for, and soluble Cr (VI) is fully leached under conditions of acidity, most
Good pH value is controlled between 2-4.Slurries fully after acidifying are sent to stirring pool through screw pump, while being thrown in stirring pool
The mixed solution of calcium sulfide and ferrous salt is added, the Cr (VI) being acidified in rear slurry is reduced into Cr (III), and in adding procedure
Cr (VI) concentration in middle sampling and testing liquid phase, dosing, mixing time are stopped when liquid phase Cr (VI) concentration is less than 0.05mg/L
It is 60 minutes.After after fully reduction, pH value is adjusted to 6- by alkali liquid tank to sodium hydroxide solution 275L (content 40%) is added in pond
8, Cr (III) is precipitated completely, it is again stirring for about 30 minutes, slurries are pumped to concentrator, carry out separation of solid and liquid；Subsequently into
Plate and frame filter press is dehydrated and volume reduction；The sewage and concentrator rotation that plate compression goes out stop the supernatant liquid isolated, and take out
Water treatment facilities are delivered to, purified treatment is carried out.
By using " soil sieves pretreatment-mechanical-physical crushing-material acidifying-Cr (VI) reduction and detoxication-stabilization
After change-separation of solid and liquid " technique is repaired to contaminated soil, its hexavalent chromium concentration is by 1245.3 initial~4866.5mg/
Kg mg/kg are down to 12.67mg/kg -5.56mg/kg, and Cr (VI) concentration after reparation is not higher than《Place soil environmental risk is commented
Valency screening value》Middle residential land standard, i.e. 30mg/Kg, and its Cr (VI) and total chromium leaching concentration are down to respectively<0.05mg/L and
<0.15mg/L, is below《Chromium slag contaminated Environment control protection technique specification》Chromium slag is used as in (provisional) (HJ/T 301-2007)
Environmental capacity index limits when roadbed material and aggregate, i.e., according to《Solid waste Leaching leaching method-sulphur
Acid+nitric acid method》Cr (VI)≤0.5mg/L, total chromium≤1.5mg/L in leachate prepared by (HJ/T 299-2007).According to the party
Total lattice and hexavalent chromium concentration are satisfied by the requirement of existing national standards in soil and its leachate after method reparation.
Embodiment 3
By taking the chromium salt factory of Gansu as an example, using the above method to high concentration (Cr (VI) pollution concentration>5000mg/kg) chromium is dirty
Dye soil carries out dystopy drip washing treatment, and concrete technology flow process and repairing effect are as follows：
After testing, soil pH is 6734.70~17883.2mg/ in 7.2~8.8 or so, Cr (VI) pollution concentrations scope
kg.For this kind of sour solvent Cr (VI) content containing chromium slag contaminated soil higher, only providing reduction stabilization agent cannot be thorough
Removing toxic substances, must carry out the physical arrangement that wet-milling destroys dregs particle, make sour solvable state therein, oxidable state, reducible state and residual
Slag state is more fully reacted after being leached by medicament with reduction medicament.
Contaminated soil is transported to dystopy treatment region, contaminated soil enters Bar strip type oscillating feeder, and removal particle diameter is more than
The gravel of 10mm.Material less than 10mm particle diameters enters circular shale shaker, and its mesh size is 2mm, thing of the particle diameter in 2mm-10mm
Material is ground into ball mill, and pulper slurrying is fallen into less than the material of 2mm particle diameters.It is maximum through the powder after ball mill grinding
Particle diameter is about 3mm-5mm, is equally sent to pulper.Herein, soil moisture content must not exceed 30% during screening.In addition, slurrying
After end, slurries deliver to regulating reservoir (about 3 meters of diameter, 14m through pumping of screw pump3Left and right volume), regulating reservoir top is connected with sour tank,
Addition technical grade (content 50%) sulfuric acid 120L is sufficiently stirred for, and soluble Cr (VI) is fully leached under conditions of acidity, most
Good pH value is controlled between 2-4.Slurries fully after acidifying are sent to stirring pool through screw pump, while being thrown in stirring pool
The mixed solution of calcium sulfide and ferrous salt is added, the Cr (VI) being acidified in rear slurry is reduced into Cr (III), and in adding procedure
Cr (VI) concentration in middle sampling and testing liquid phase, dosing, mixing time are stopped when liquid phase Cr (VI) concentration is less than 0.05mg/L
It is 60 minutes.After after fully reduction, pH value is adjusted to 6- by alkali liquid tank to sodium hydroxide solution 300L (content 40%) is added in pond
8, Cr (III) is precipitated completely, it is again stirring for about 30 minutes, slurries are pumped to concentrator, carry out separation of solid and liquid；Subsequently into
Plate and frame filter press is dehydrated and volume reduction；The sewage and concentrator rotation that plate compression goes out stop the supernatant liquid isolated, and take out
Water treatment facilities are delivered to, purified treatment is carried out.
By using " soil sieves pretreatment-mechanical-physical crushing-material acidifying-Cr (VI) reduction and detoxication-stabilization
After change-separation of solid and liquid " technique is repaired to contaminated soil, its hexavalent chromium concentration by initial 6734.70~
17883.2mg/kgmg/kg is down to 25.59mg/kg -10.52mg/kg, and Cr (VI) concentration after reparation 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 are down to respectively<
0.05mg/L and<0.15mg/L, is below《Chromium slag contaminated Environment control protection technique specification》(provisional) (HJ/T 301-2007)
Middle chromium slag be used as roadbed material and aggregate when Environmental capacity index limits, i.e., according to《Solid waste Leaching soaks
Go out method-sulfonitric method》Cr (VI)≤0.5mg/L, total chromium≤1.5mg/ in leachate prepared by (HJ/T 299-2007)
L.Total lattice and hexavalent chromium concentration are satisfied by the requirement of existing national standards in soil and its leachate after repairing in the method.
Claims (10)
1. the processing method of repairing hexavalent chromium polluted soil, it is characterised in that the method includes following operating procedure：
1) contaminated soil is carried out into vibrosieve or milled processed, to form material of the particle diameter less than 2mm, and controls soil water-containing
Rate is no more than 30%；
2) material by particle diameter less than 2mm sends into pulper slurrying；
3) slurries that will be obtained are sent to regulating reservoir, and adjust the pH value of slurries to 2-4, it is fully acidified；
4) slurries after acidifying are sent into stirring pool, and adds the mixed solution of calcium polysulfide and ferrous salt, make acidifying rear slurry
In Cr (VI) be fully reduced into Cr (III), and slurries is formed chromium hydroxide precipitation, while adjust pH value to 6-8, then will slurry
Liquid delivers to concentrator treatment；
5) separation of solid and liquid is carried out to slurries by concentrator, the underflow mud feeding sheet frame liquid filter of thickening is carried out into press filtration takes off
Water, forms mud cake.
2. the processing method of repairing hexavalent chromium polluted soil according to claim 1, it is characterised in that step 1) in, it is described
Vibrosieve is sieved including two-stage vibration, and first order vibrosieve is material of the particle separation diameter less than 10mm, and particle diameter is less than
The material feeding second level vibrosieve of 10mm, the material feeding stone scrubber by particle diameter more than 10mm carries out wash-out treatment, second
Level vibrosieve is material of the particle separation diameter less than 2mm, and the material by particle diameter less than 2mm is sent directly into slurrying in pulper；Institute
It is the material feeding ball mill treatment by particle diameter more than 2mm to state milled processed, to obtain material of the particle diameter less than 2mm, and is passed through
Slurrying in pulper is sent into after adding appropriate moisture.
3. the processing method of repairing hexavalent chromium polluted soil according to claim 2, it is characterised in that stop point concentrator rotation
Material moisture after supernatant liquid and sheet frame liquid the filter treatment for separating out sends into water treatment facilities after filter-cloth filtering and enters water-filling
Matter treatment, after making that water body purification is up to standard and meeting reuse requirement, in feeding water pot, with supplied to pulper and stone scrubber, through washing stone
Leacheate after the de- treatment of machine washing is delivered in pulper again.
4. the processing method of repairing hexavalent chromium polluted soil according to claim 1 or claim 2, it is characterised in that many vulcanizations
The collocation method of the mixed solution of calcium and ferrous salt is：In mass ratio it is 4 by calcium polysulfide and green vitriol:6 mixing
Stirring in water is put into, and the mass concentration of two material summations is reached 50%, air completely cut off after stirring and is sealed up for safekeeping.
5. the processing method of repairing hexavalent chromium polluted soil according to claim 4, it is characterised in that seven hydrated sulfuric acid
Analysis pure level product of the ferrous iron from content up to 99%, the calcium polysulfide selects technical grade calcium polysulfide product.
6. the processing method of repairing hexavalent chromium polluted soil according to claim 1, it is characterised in that step 3) in, addition
After the mixed solution of calcium polysulfide and ferrous salt, stir 60 minutes, after waiting fully reduction, then to addition stabilization chemical drug in stirring pool
Agent molysite or calcium salt make slurries form chromium hydroxide precipitation, are then stirred for 30 minutes.
7. the processing equipment that the processing method of repairing hexavalent chromium polluted soil is used according to claim 1, it is characterised in that
The equipment includes oscillating feeder, stone scrubber, vibratory sieve, ball mill, pulper, regulating reservoir, stirring pool, concentrator, sheet frame pressure
Filter, water treatment facilities, material of the vibrating feed function particle separation diameter less than 10mm, vibratory sieve energy particle separation diameter are less than 2mm's
Material, the small material outlet in bottom of oscillating feeder connects with vibratory sieve, the big material outlet in side of oscillating feeder with wash stone
Machine connects, and the small material outlet in bottom of vibratory sieve connects with pulper, the big material outlet in side and the ball mill phase of vibratory sieve
Connect, the outlet of ball mill connects with pulper；The serum outlet of pulper connects with regulating reservoir, the outlet of regulating reservoir and stirring pool
Connect, the outlet connection concentrator of stirring pool, the thickened mud outlet connection plate and frame filter press of concentrator, the liquid of plate and frame filter press
Body is exported and the liquid outlet of concentrator connects water treatment facilities, and the outlet of water treatment facilities connects water pot, water pot warp by the road
Pipeline connects pulper and stone scrubber, and slurries transfer pipeline is connected between stone scrubber and pulper.
8. the processing equipment that the processing method of repairing hexavalent chromium polluted soil is used according to claim 6, it is characterised in that
The entrance connection hopper of the oscillating feeder.
9. the processing equipment that the processing method of repairing hexavalent chromium polluted soil is used according to claim 6, it is characterised in that
The regulating reservoir is connected by the road with sour tank, to facilitate the material of input regulation pH value.
10. the processing equipment that the processing method of repairing hexavalent chromium polluted soil is used according to claim 6, its feature exists
In the stirring pool is connected by the road with pharmacy jar, alkali liquid tank, to facilitate input for the medicament of precipitation and for adjusting
The material of pH value.
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| CN109092870A (en) * | 2018-11-05 | 2018-12-28 | 北京建工环境修复股份有限公司 | A kind of pollution of chromium building waste immersion systems and its embathe method |
| CN109092870B (en) * | 2018-11-05 | 2023-10-03 | 北京建工环境修复股份有限公司 | Chromium-polluted building rubbish pickling system and pickling method thereof |
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| CN112718794A (en) * | 2020-12-14 | 2021-04-30 | 深圳市卓域环保科技有限公司 | Harmless muck treatment system |
| CN112718794B (en) * | 2020-12-14 | 2021-11-16 | 深圳市卓域环保科技有限公司 | Harmless muck treatment system |
| CN112974509A (en) * | 2021-03-15 | 2021-06-18 | 湖南新九方科技有限公司 | Treatment method for heavy metal waste residue and soil mixed pollution medium |
| CN113926840A (en) * | 2021-10-21 | 2022-01-14 | 生态环境部南京环境科学研究所 | Biological pile repairing method for organic contaminated soil |
| CN114029327A (en) * | 2021-11-30 | 2022-02-11 | 中国原子能科学研究院 | Method for cleaning and decontaminating radioactive contaminated soil |
| CN114535274A (en) * | 2022-03-11 | 2022-05-27 | 江西鑫泉固废处理有限公司 | Surging filtering adsorption type heavy metal contaminated soil treatment equipment |
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Application publication date: 20170531 |