CN108723071A - One kind harmless treatment device containing chromium soil and processing method - Google Patents
One kind harmless treatment device containing chromium soil and processing method Download PDFInfo
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- CN108723071A CN108723071A CN201810496954.4A CN201810496954A CN108723071A CN 108723071 A CN108723071 A CN 108723071A CN 201810496954 A CN201810496954 A CN 201810496954A CN 108723071 A CN108723071 A CN 108723071A
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- grinding pot
- soil
- containing chromium
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- tank
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of harmless treatment device containing chromium soil and processing methods, the processing unit includes grinding pot, restore box and mashing tank, the inside of the grinding pot is fixedly connected with abrasive sheet, and solenoid valve is equipped in the intermediate discharge port of abrasive sheet, it is installed with variable-frequency motor at the top of cover at the top of the grinding pot, the output shaft of the variable-frequency motor is fixedly connected with mill ball, the side of the grinding pot is welded with charge pipe, position is installed with clockwise and anticlockwise motor among the cover of the mashing tank top, and the output shaft of clockwise and anticlockwise motor is sequentially connected with paddle stirring blade, the side bottom end of the grinding pot and mashing tank is equipped with outlet pipe, the side that the bottom of the grinding pot and mashing tank is located at filter screen is respectively equipped with drainage conduit and discharge nozzle.The processing unit and method advantages of simple, it is easy to operate, it is time saving and energy saving, reduce the wasting of resources, harm of the effective solution containing chromium soil, energy conservation and environmental protection, safety and stability.
Description
Technical field
The invention belongs to the fields of innoxious process for treating containing chromium soil in environmental protection, and in particular to one kind containing chromium soil
Harmless treatment device also relates to a kind of method for innocent treatment containing chromium soil.
Background technology
Chromium compound has toxic effect, wherein the Cr6+ toxicity with Strong oxdiative and permeation body film ability is most strong, is
100 times of Cr3+ cause greatly to poison, cause the diseases such as skin cancer, gland cancer and biology, vegetation big to human body, biology and vegetation
Amount is dead.
Now with industrial wastewater discharge discharge wantonly to suddenly caused by seriously pollute, the content of chromium is more next in soil
Higher, chromium can exist in the form of chromate in the soil, adsorb without in soil texture, can not degrade, for a long time can be impurely
Lower water.It can be absorbed by crops, into food chain, to be detrimental to health.In the prior art, to the innoxious place of chromium in soil
Reason has following methods：
Chinese patent application 201720459358.X discloses a kind of processing device containing chromium soil, as shown in Figure 1, including under
Open sbr reactor device, the sbr reactor device is held to be set to the liquid storage device inner cavity controlled by temperature control device, the sbr reactor device
Inner cavity be equipped with beer fermentation sludge, organic wastewater, sulphate additives and the mixture containing chromium soil, the liquid storage device it is upper
End is open setting, and the mixed liquor of water and ion titanium mixture is placed in the liquid storage device, and the liquid storage device passes through water circulating pump
And water pipe is connected to the upper end of sbr reactor device, the sbr reactor device side wall is provided with sample tap higher than the position of liquid storage device.It should
Scheme can not only be effectively removed the chromium in soil, and anaerobic sludge can be made to realize changing waste into resources with organic wastewater,
Achieve the purpose that " treatment of wastes with processes of wastes against one another " of comprehensive utilization of waste materials.
Chinese patent application 201010560541.1 discloses a kind of processing of soil remediation containing Cr VI restoring method, such as schemes
Shown in 2, using the dry chromium soil containing sexavalence that draws water, the Cr VI in water sweetening of the soil is handled into trivalent chromium, water qualified discharge contains
Chromium soil restores ecosystem；Fixed range containing chromium soil, ditches outside range, the ripe moulded pottery not yet put in a kiln to bake barrier dam water proof in outside in ditch,
Back-up sand on the inside of ditch, buries filter pipe, then fill and lead up ditch with net soil in sand；It filters water in water pipe to be handled, using Detoxicating liquid medicine
Cr VI in processing water becomes trivalent chromium, and through precipitating dehydration, water qualified discharge, dehydrate remakes waste processing；Simultaneously
Arrangement trench digging connection drainage pipeline drainage, teds dry soil, then be impregnated with using detoxicating liquid in drainage scope tube, impregnates reaction
Cr VI in soil is in neutrality at trivalent chromium, then lattice separates backfill, until the inspection of fetching earth that all continues to draw water after completion
It surveys, meets the requirements of the standard, earthing is used or directly used.
But in above-mentioned technical proposal, the treatment effeciency for handling the device containing chromium soil is low, and the pollution of soil is usually big
Scale, so be difficult to carry out harmless treatment containing chromium soil on a large scale；And the processing of soil remediation containing Cr VI is also
It is chromium soil to be contained using dry sexavalence of drawing water, not only technique is multiple for this mode after soil is by pollution of chromium in original method
It is miscellaneous, and long processing period, while it is poor to the improved treatment effect of soil, by extraneous factor serious interference.
Invention content
The purpose of the present invention is to provide a kind of harmless treatment device containing chromium soil and processing methods, to solve the above-mentioned back of the body
The efficiency of harmless treatment containing chromium soil that is itd is proposed in scape technology is low, complex process, and long processing period, while changing to soil
Good poor processing effect, the problem of by extraneous factor serious interference.
To achieve the above object, present invention employs following technical solutions：
A kind of harmless treatment device containing chromium soil, including grinding pot, reduction box and mashing tank, the grinding pot and mashing tank
Top has been fixedly connected with cover, and the top movable for restoring box is equipped with box cover, and the inside of the grinding pot is fixedly connected with
Abrasive sheet, and solenoid valve is equipped in the intermediate discharge port of abrasive sheet, it is installed with change at the top of the cover at the top of the grinding pot
Frequency motor, and both sides are respectively welded feed hopper and water injection pipe, the output of the variable-frequency motor at the top of the cover at the top of grinding pot
Axis is fixedly connected with by bull stick through cover is located at abrasive sheet with the matched mill ball of abrasive sheet, the side of the grinding pot
Bottom end be welded with charge pipe, the inner bottom of the grinding pot is inlaid with PH sensor, and the front of grinding pot is equipped with and PH
The LED display of sensor signal connection, mashing tank top cover centre position are installed with clockwise and anticlockwise motor, and just
The output shaft for inverting motor is sequentially connected with paddle stirring blade through cover, and the grinding pot and the side bottom end for being beaten tank are equal
End equipped with outlet pipe, and outlet pipe is connected with filter screen, and the grinding pot and the bottom for being beaten tank are located at the one of filter screen
Side is respectively equipped with drainage conduit and discharge nozzle, and the drainage conduit bottom end on the grinding pot is fixedly connected on the one of mashing tank top cover
Side, and the outlet pipe on grinding pot is fixedly connected with reduction box.
Preferably, the inside of the reduction box is also movably installed with filter screen, and restores cassette bottom portion outlet pipe and be fixedly connected
In the other side of mashing tank top cover, the mashing pot bottom outlet pipe is fixedly connected with liquid-collecting box, and the side of liquid-collecting box
It is fixed with water pump, the side bottom end of the grinding pot is equipped with connecting tube, and the output end of water pump is fixed by pipeline and connecting tube
Connection.
Preferably, the inner bottom of the grinding pot and mashing tank is to be obliquely installed.
Preferably, the bottom of the reduction box is funnel type.
Preferably, the top of the abrasive sheet is semicircular arc-shaped.
Preferably, the surface of the abrasive sheet is equipped with antiskid thread.
Preferably, the outlet pipe, drainage conduit discharge nozzle inner tip be all provided with by solenoid valve, be beaten tank top cover
Top nose be equipped with charge pipe.
Preferably, in order to make to be fully ground in grinding pot containing chromium soil, preferably to remove harmful chromium in soil, institute
The abrasive sheet stated is metal casting tablet, and surface coats or be embedded with abrasive grains.
Preferably, the abrasive grains are quartz sand.The shape of the quartz sand is in irregular, has corner angle, with
Convenient for being fully ground to containing chromium soil.The largest contours diameter phi of the quartz sand is 0.25-0.75mm；Mohs' hardness P
For 6.7-7.5.Largest contours diameter phi and Mohs' hardness P meet φ P and are less than or equal to 5.45 more than or equal to 1.82.
Preferably, while ensureing to be fully ground to containing chromium soil, ensure the life-cycle of quartz sand, prevent it
The angle A of fragmentation, the corner angle is obtuse angle.Preferably, ranging from 95-165 ° of the angle A.
Preferably, the largest contours diameter phi of the quartz sand, Mohs' hardness P, angle A meet following relationship：
；
Wherein λ is the largest contours diameter adjustment factor of quartz sand, value range 0.45-1.72；Above formula only carries out numerical value meter
It calculates, without unit-distance code.
The present invention also provides a kind of methods of harmless treatment containing chromium soil, include the following steps：
S1, elder generation chromium slag and contaminated soil are added in grinding pot from feed hopper, while being added clearly in grinding pot from water injection pipe
Then water controls variable-frequency motor and mill ball is driven to be rotatably assorted abrasive sheet to soil progress wet-milling；
Then S2, wet-milling are ground containing solenoid valve is opened after chromium soil grinding pot inner bottom is passed through containing chromium soil from charge pipe is past
Injection acid solution enters acidification in grinding jar, and PH sensor and LED display is coordinated to observe the acid-base value of solution in real time；
S3, it does not make the solenoid valve in water pipe in rebound time control when ph values and opens, makes filtering out impurity under the cooperation of filter screen
Liquid enters in reduction box, while being successively added in reduction box and reconciling liquid and sulphur, and first the pH value of solution is mediated,
Solution is restored；
From reduction cassette bottom portion, outlet pipe enters mashing tank to solution after S4, reduction after filter screen filters out impurity, controls simultaneously
Solenoid valve inside drainage conduit is opened, and mashing tank is added in the impurity in grinding pot, the filter cake restored at this time in box can carry out
Market sale；
S5, clockwise and anticlockwise motor band movable paddle type stirring blade rotation is controlled again while reducing agent is added in mashing tank from charge pipe,
So that mashing between solution and impurity is reacted, using acid passivation is adjusted, cures, so that filtrate is entered in liquid-collecting box after filtering, and filter plate
It is discharged from discharge nozzle as progress roadbed embedding material；
S6, solution in pump handle liquid-collecting box is finally utilized to be pumped into recycling in grinding pot.
Preferably, it is detected in the step S1 and carries out adding water operation when soil is higher than 0.5% containing chromium again, and water addition ratio example 1：
0.5 to 1：5.
Preferably, the acid in the step S2 includes sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, acetic acid, in lactic acid and citric acid
It is one or more.
Preferably, Cr VI is filtered after being less than 0.5ppm in solution after being restored in the step S4, and in step S5
Total chromium is less than 1.5ppm in leachate, and Cr VI is filtered after being less than 0.5ppm.
Preferably, reducing agent is ferrous sulfate, sodium pyrosulfite, sodium hydrogensulfite, sodium thiosulfate in the step S5
Or vitamins ascorbic acid.
Compared with prior art, technique effect of the invention and advantage：
1, harmless treatment device containing chromium soil of the invention and processing method, by grinding pot, reduction box and mashing tank to chromium
Slag, contaminated soil carries out wet-milling, acidification, reduction and mashing can be effectively chromium slag and contaminated soil improvement at being useful for
Sale is comprehensively utilized for road brick, reduces energy consumption；
2, harmless treatment device containing chromium soil of the invention and processing method are coordinated by liquid-collecting box and water pump filtrate cycle
It uses, improves to chromium slag, energy conservation and environmental protection while being contaminated soil treatment improved effect；
3, harmless treatment device containing chromium soil of the invention and processing method, by directly being carried out to chromium slag and contaminated soil
The mode that reagent improvement is added in mitigation grinding can reduce labour, and easy to operate, safe operation reduces extraneous factor
Interference；
4, harmless treatment device containing chromium soil of the invention and processing method, by the material that abrasive sheet and abrasive grains is arranged
Matter, so as to be fully ground in grinding pot containing chromium soil, preferably to remove harmful chromium in soil；
5, harmless treatment device containing chromium soil of the invention and processing method, by the largest contours diameter of setting quartz sand,
The relationship of Mohs' hardness, the value range of angle and satisfaction reduces processing week to further increase the grinding efficiency to soil
Phase.
Description of the drawings
Fig. 1 is a kind of processing schematic device containing chromium soil in the prior art；
Fig. 2 is that a kind of soil remediation containing Cr VI in the prior art handles restoring method schematic diagram；
Fig. 3 is the schematic diagram of harmless treatment device containing chromium soil of the present invention；
Fig. 4 is the sectional view of the grinding pot of harmless treatment device containing chromium soil of the present invention；
Fig. 5 is that the harmless treatment device containing chromium soil of the present invention is beaten the section view of tank.
In Fig. 3-5：1 grinding pot, 2 reduction boxes, 3 mashing tanks, 4 covers, 5 box covers, 6 variable-frequency motors, 7 feed hoppers, 8 water fillings
Pipe, 9 mill balls, 10 abrasive sheets, 11 solenoid valves, 12 charge pipes, 13 PH sensors, 14 LED displays, 15 outlet pipes, 16 mistakes
Strainer, 17 drainage conduits, 18 clockwise and anticlockwise motors, 19 paddle stirring blades, 20 discharge nozzles, 21 liquid-collecting box, 22 water pumps, 23 connecting tubes.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Herein
Described specific embodiment is only used to explain the present invention, is not intended to limit the present invention.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Embodiment 1
As shown in Figs. 1-3, a kind of harmless treatment device containing chromium soil, including grinding pot 1, reduction box 2 and mashing tank 3, it is described
The top of grinding pot 1 and mashing tank 3 has been fixedly connected with cover 4, and the top movable for restoring box 2 is equipped with box cover 5, described to grind
The inside of grinding jar 1 is fixedly connected with abrasive sheet 10, and solenoid valve 11, the grinding pot are equipped in the intermediate discharge port of abrasive sheet 10
The top of cover 4 at 1 top is installed with variable-frequency motor 6, and the 4 top both sides of cover at 1 top of grinding pot be respectively welded into
Hopper 7 and water injection pipe 8, the output shaft of the variable-frequency motor 6 is fixedly connected with by bull stick through cover 4 to match with abrasive sheet 10
The mill ball 9 of conjunction, the bottom end that the side of the grinding pot 1 is located at abrasive sheet 10 are welded with charge pipe 12, the grinding pot 1 it is interior
Portion bottom end is inlaid with PH sensor 13, and the front of grinding pot 1 is equipped with the LED display 14 being connect with 13 signal of PH sensor,
3 top cover of mashing tank, the 4 intermediate position is installed with clockwise and anticlockwise motor 18, and the output shaft of clockwise and anticlockwise motor 18 runs through
Cover 4 is sequentially connected with paddle stirring blade 19, and the grinding pot 1 and the side bottom end for being beaten tank 3 are equipped with outlet pipe 15, and
The end of outlet pipe 15 is connected with filter screen 16, and the grinding pot 1 and the bottom for being beaten tank 3 are located at the side difference of filter screen 16
Equipped with drainage conduit 17 and discharge nozzle 20,17 bottom end of drainage conduit on the grinding pot 1 is fixedly connected on mashing 3 top cover 4 of tank
Side, and the outlet pipe 15 on grinding pot 1 with reduction box 2 be fixedly connected, it is described reduction box 2 inside be also movably installed with
Strainer 16, and restore the other side that 2 bottom outlet pipe 15 of box is fixedly connected on mashing 3 top cover 4 of tank, 3 bottom of mashing tank
Portion's outlet pipe is fixedly connected with liquid-collecting box 21, and the side of liquid-collecting box 21 is fixed with water pump 22, the side bottom end of the grinding pot 1
Equipped with connecting tube 23, and the output end of water pump 22 is fixedly connected by pipeline with connecting tube 23.
The inner bottom of the grinding pot 1 and mashing tank 3 is that the bottom for being obliquely installed, and restoring box 2 is funnel type.
The top of abrasive sheet 10 is semicircular arc-shaped, and the surface of abrasive sheet 10 is equipped with antiskid thread.
The outlet pipe 15,17 discharge nozzle 20 of drainage conduit inner tip be also all provided with by solenoid valve 11, and be beaten tank 3 and push up
The top nose of portion's cover 4 also is provided with charge pipe 12.
The present invention also provides a kind of methods of harmless treatment containing chromium soil, include the following steps：
S1, elder generation chromium slag and contaminated soil are added in grinding pot from feed hopper, while being added clearly in grinding pot from water injection pipe
Then water controls variable-frequency motor and mill ball is driven to be rotatably assorted abrasive sheet to soil progress wet-milling；
Then S2, wet-milling are ground containing solenoid valve is opened after chromium soil grinding pot inner bottom is passed through containing chromium soil from charge pipe is past
Injection acid solution enters acidification in grinding jar, and PH sensor and LED display is coordinated to observe the acid-base value of solution in real time；
S3, it does not make the solenoid valve in water pipe in rebound time control when ph values and opens, makes filtering out impurity under the cooperation of filter screen
Liquid enters in reduction box, while being successively added in reduction box and reconciling liquid and sulphur, and first the pH value of solution is mediated,
Solution is restored；
From reduction cassette bottom portion, outlet pipe enters mashing tank to solution after S4, reduction after filter screen filters out impurity, controls simultaneously
Solenoid valve inside drainage conduit is opened, and mashing tank is added in the impurity in grinding pot, the filter cake restored at this time in box can carry out
Market sale；
S5, clockwise and anticlockwise motor band movable paddle type stirring blade rotation is controlled again while reducing agent is added in mashing tank from charge pipe,
So that mashing between solution and impurity is reacted, using acid passivation is adjusted, cures, so that filtrate is entered in liquid-collecting box after filtering, and filter plate
It is discharged from discharge nozzle as progress roadbed embedding material；
S6, solution in pump handle liquid-collecting box is finally utilized to be pumped into recycling in grinding pot.
It is detected in the step S1 and carries out adding water operation, and water addition ratio example 1 again when soil is higher than 0.5% containing chromium：0.5 to 1：
5。
Operation principle：The present invention is by the way that chromium slag, being contaminated soil progress wet-milling, acidification, reduction and mashing can be effective
Chromium slag and contaminated soil improvement at being useful for selling or be comprehensively utilized for road brick, reduce energy consumption, profit
Coordinated with water pump 22 with liquid-collecting box 21 and filtrate cycle is used, improved to chromium slag, while being contaminated soil treatment improved effect
Energy conservation and environmental protection.
The processing method of the invention simultaneously reduces labour, and easy to operate, safe operation reduces the dry of extraneous factor
It disturbs, it is time saving and energy saving, reduce the wasting of resources, harm of the effective solution containing chromium soil, energy conservation and environmental protection, safety and stability, the scope of application
Extensively.
Embodiment 2
A kind of harmless treatment device containing chromium soil, including grinding pot 1, reduction box 2 and mashing tank 3, the grinding pot 1 and mashing
The top of tank 3 has been fixedly connected with cover 4, and the top movable for restoring box 2 is equipped with box cover 5, and the inside of the grinding pot 1 is solid
Surely it is connected with abrasive sheet 10, and is equipped with solenoid valve 11 in the intermediate discharge port of abrasive sheet 10, the cover 4 at 1 top of the grinding pot
Top is installed with variable-frequency motor 6, and the 4 top both sides of cover at 1 top of grinding pot are respectively welded feed hopper 7 and water injection pipe
8, the output shaft of the variable-frequency motor 6 by bull stick through cover 4 be fixedly connected with 10 matched mill ball 9 of abrasive sheet,
The bottom end that the side of the grinding pot 1 is located at abrasive sheet 10 is welded with charge pipe 12, and the inner bottom of the grinding pot 1 is inlaid with
PH sensor 13, and the front of grinding pot 1 is equipped with the LED display 14 being connect with 13 signal of PH sensor, the mashing tank 3 pushes up
Cover 4 intermediate position in portion's is installed with clockwise and anticlockwise motor 18, and the output shaft of clockwise and anticlockwise motor 18 is sequentially connected through cover 4
There are paddle stirring blade 19, the grinding pot 1 and the side bottom end for being beaten tank 3 to be equipped with outlet pipe 15, and the end of outlet pipe 15
Portion is connected with filter screen 16, and the side that the grinding pot 1 and the bottom for being beaten tank 3 are located at filter screen 16 is respectively equipped with drainage conduit 17
With discharge nozzle 20,17 bottom end of drainage conduit on the grinding pot 1 is fixedly connected on the side of mashing 3 top cover 4 of tank, and grinds
Outlet pipe 15 on tank 1 is fixedly connected with reduction box 2, and the inside of the reduction box 2 is also movably installed with filter screen 16, and restores
2 bottom outlet pipe 15 of box is fixedly connected on the other side of mashing 3 top cover 4 of tank, and 3 bottom outlet pipe of the mashing tank, which is fixed, to be connected
It being connected to liquid-collecting box 21, and the side of liquid-collecting box 21 is fixed with water pump 22, the side bottom end of the grinding pot 1 is equipped with connecting tube 23,
And the output end of water pump 22 is fixedly connected by pipeline with connecting tube 23.
The inner bottom of the grinding pot 1 and mashing tank 3 is that the bottom for being obliquely installed, and restoring box 2 is funnel type.
The top of abrasive sheet 10 is semicircular arc-shaped, and the surface of abrasive sheet 10 is equipped with antiskid thread.
The outlet pipe 15,17 discharge nozzle 20 of drainage conduit inner tip be also all provided with by solenoid valve 11, and be beaten tank 3 and push up
The top nose of portion's cover 4 also is provided with charge pipe 12.
In order to make to be fully ground in grinding pot containing chromium soil, preferably to remove harmful chromium in soil, described grinds
Nog plate is metal casting tablet, and surface coats or be embedded with abrasive grains.
The abrasive grains are quartz sand.The shape of the quartz sand is in irregular, has corner angle, in order to containing
Chromium soil is fully ground.The largest contours diameter phi of the quartz sand is 0.25-0.75mm；Mohs' hardness P is 6.7-
7.5.Largest contours diameter phi and Mohs' hardness P meet φ P and are less than or equal to 5.45 more than or equal to 1.82.
The present invention also provides a kind of methods of harmless treatment containing chromium soil, include the following steps：
S1, elder generation chromium slag and contaminated soil are added in grinding pot from feed hopper, while being added clearly in grinding pot from water injection pipe
Then water controls variable-frequency motor and mill ball is driven to be rotatably assorted abrasive sheet to soil progress wet-milling；
Then S2, wet-milling are ground containing solenoid valve is opened after chromium soil grinding pot inner bottom is passed through containing chromium soil from charge pipe is past
Injection acid solution enters acidification in grinding jar, and PH sensor and LED display is coordinated to observe the acid-base value of solution in real time；
S3, it does not make the solenoid valve in water pipe in rebound time control when ph values and opens, makes filtering out impurity under the cooperation of filter screen
Liquid enters in reduction box, while being successively added in reduction box and reconciling liquid and sulphur, and first the pH value of solution is mediated,
Solution is restored；
From reduction cassette bottom portion, outlet pipe enters mashing tank to solution after S4, reduction after filter screen filters out impurity, controls simultaneously
Solenoid valve inside drainage conduit is opened, and mashing tank is added in the impurity in grinding pot, the filter cake restored at this time in box can carry out
Market sale；
S5, clockwise and anticlockwise motor band movable paddle type stirring blade rotation is controlled again while reducing agent is added in mashing tank from charge pipe,
So that mashing between solution and impurity is reacted, using acid passivation is adjusted, cures, so that filtrate is entered in liquid-collecting box after filtering, and filter plate
It is discharged from discharge nozzle as progress roadbed embedding material；
S6, solution in pump handle liquid-collecting box is finally utilized to be pumped into recycling in grinding pot.
It is detected in the step S1 and carries out adding water operation, and water addition ratio example 1 again when soil is higher than 0.5% containing chromium：0.5 to 1：
5。
Acid in the step S2 includes sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, acetic acid, one kind or more in lactic acid and citric acid
Kind.
Embodiment 3
A kind of harmless treatment device containing chromium soil, including grinding pot 1, reduction box 2 and mashing tank 3, the grinding pot 1 and mashing
The top of tank 3 has been fixedly connected with cover 4, and the top movable for restoring box 2 is equipped with box cover 5, and the inside of the grinding pot 1 is solid
Surely it is connected with abrasive sheet 10, and is equipped with solenoid valve 11 in the intermediate discharge port of abrasive sheet 10, the cover 4 at 1 top of the grinding pot
Top is installed with variable-frequency motor 6, and the 4 top both sides of cover at 1 top of grinding pot are respectively welded feed hopper 7 and water injection pipe
8, the output shaft of the variable-frequency motor 6 by bull stick through cover 4 be fixedly connected with 10 matched mill ball 9 of abrasive sheet,
The bottom end that the side of the grinding pot 1 is located at abrasive sheet 10 is welded with charge pipe 12, and the inner bottom of the grinding pot 1 is inlaid with
PH sensor 13, and the front of grinding pot 1 is equipped with the LED display 14 being connect with 13 signal of PH sensor, the mashing tank 3 pushes up
Cover 4 intermediate position in portion's is installed with clockwise and anticlockwise motor 18, and the output shaft of clockwise and anticlockwise motor 18 is sequentially connected through cover 4
There are paddle stirring blade 19, the grinding pot 1 and the side bottom end for being beaten tank 3 to be equipped with outlet pipe 15, and the end of outlet pipe 15
Portion is connected with filter screen 16, and the side that the grinding pot 1 and the bottom for being beaten tank 3 are located at filter screen 16 is respectively equipped with drainage conduit 17
With discharge nozzle 20,17 bottom end of drainage conduit on the grinding pot 1 is fixedly connected on the side of mashing 3 top cover 4 of tank, and grinds
Outlet pipe 15 on tank 1 is fixedly connected with reduction box 2, and the inside of the reduction box 2 is also movably installed with filter screen 16, and restores
2 bottom outlet pipe 15 of box is fixedly connected on the other side of mashing 3 top cover 4 of tank, and 3 bottom outlet pipe of the mashing tank, which is fixed, to be connected
It being connected to liquid-collecting box 21, and the side of liquid-collecting box 21 is fixed with water pump 22, the side bottom end of the grinding pot 1 is equipped with connecting tube 23,
And the output end of water pump 22 is fixedly connected by pipeline with connecting tube 23.
The inner bottom of the grinding pot 1 and mashing tank 3 is that the bottom for being obliquely installed, and restoring box 2 is funnel type.
The top of abrasive sheet 10 is semicircular arc-shaped, and the surface of abrasive sheet 10 is equipped with antiskid thread.
The outlet pipe 15,17 discharge nozzle 20 of drainage conduit inner tip be also all provided with by solenoid valve 11, and be beaten tank 3 and push up
The top nose of portion's cover 4 also is provided with charge pipe 12.
In order to make to be fully ground in grinding pot containing chromium soil, preferably to remove harmful chromium in soil, described grinds
Nog plate is metal casting tablet, and surface coats or be embedded with abrasive grains.
The abrasive grains are quartz sand.The shape of the quartz sand is in irregular, has corner angle, in order to containing
Chromium soil is fully ground.The largest contours diameter phi of the quartz sand is 0.25-0.75mm；Mohs' hardness P is 6.7-
7.5.Largest contours diameter phi and Mohs' hardness P meet φ P and are less than or equal to 5.45 more than or equal to 1.82.
While ensureing to be fully ground to containing chromium soil, ensures the life-cycle of quartz sand, prevent its fragmentation, institute
The angle A for stating corner angle is obtuse angle.Preferably, ranging from 95-165 ° of the angle A.
Largest contours diameter phi, Mohs' hardness P, the angle A of the quartz sand meet following relationship：
；
Wherein λ is the largest contours diameter adjustment factor of quartz sand, value range 0.45-1.72；Above formula only carries out numerical value meter
It calculates, without unit-distance code.
The present invention also provides a kind of methods of harmless treatment containing chromium soil, include the following steps：
S1, elder generation chromium slag and contaminated soil are added in grinding pot from feed hopper, while being added clearly in grinding pot from water injection pipe
Then water controls variable-frequency motor and mill ball is driven to be rotatably assorted abrasive sheet to soil progress wet-milling；
Then S2, wet-milling are ground containing solenoid valve is opened after chromium soil grinding pot inner bottom is passed through containing chromium soil from charge pipe is past
Injection acid solution enters acidification in grinding jar, and PH sensor and LED display is coordinated to observe the acid-base value of solution in real time；
S3, it does not make the solenoid valve in water pipe in rebound time control when ph values and opens, makes filtering out impurity under the cooperation of filter screen
Liquid enters in reduction box, while being successively added in reduction box and reconciling liquid and sulphur, and first the pH value of solution is mediated,
Solution is restored；
From reduction cassette bottom portion, outlet pipe enters mashing tank to solution after S4, reduction after filter screen filters out impurity, controls simultaneously
Solenoid valve inside drainage conduit is opened, and mashing tank is added in the impurity in grinding pot, the filter cake restored at this time in box can carry out
Market sale；
S5, clockwise and anticlockwise motor band movable paddle type stirring blade rotation is controlled again while reducing agent is added in mashing tank from charge pipe,
So that mashing between solution and impurity is reacted, using acid passivation is adjusted, cures, so that filtrate is entered in liquid-collecting box after filtering, and filter plate
It is discharged from discharge nozzle as progress roadbed embedding material；
S6, solution in pump handle liquid-collecting box is finally utilized to be pumped into recycling in grinding pot.
It is detected in the step S1 and carries out adding water operation, and water addition ratio example 1 again when soil is higher than 0.5% containing chromium：0.5 to 1：
5。
Acid in the step S2 includes sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, acetic acid, one kind or more in lactic acid and citric acid
Kind.
Cr VI is filtered after being less than 0.5ppm in solution after being restored in the step S4, and in step S5 in leachate
Total chromium is less than 1.5ppm, and Cr VI is filtered after being less than 0.5ppm.
Reducing agent is ferrous sulfate, sodium pyrosulfite, sodium hydrogensulfite, sodium thiosulfate or dimension life in the step S5
Plain ascorbic acid.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (9)
1. a kind of harmless treatment device containing chromium soil, including grinding pot（1）, reduction box（2）With mashing tank（3）, feature exists
In：The grinding pot（1）With mashing tank（3）Top be fixedly connected with cover（4）, and restore box（2）Top movable peace
Equipped with box cover（5）, the grinding pot（1）Inside be fixedly connected with abrasive sheet（10）, and abrasive sheet（10）Intermediate discharge port
It is interior to be equipped with solenoid valve（11）, the grinding pot（1）The cover at top（4）Top is installed with variable-frequency motor（6）, and grinding pot
（1）The cover at top（4）Top both sides are respectively welded feed hopper（7）And water injection pipe（8）, the variable-frequency motor（6）Output
Axis runs through cover by bull stick（4）It is fixedly connected with and abrasive sheet（10）Matched mill ball（9）, the grinding pot（1）'s
Side is located at abrasive sheet（10）Bottom end be welded with charge pipe（12）, the grinding pot（1）Inner bottom be inlaid with PH sensing
Device（13）, and grinding pot（1）Front be equipped with and PH sensor（13）The LED display of signal connection（14）, the mashing tank
（3）Top cover（4）Intermediate position is installed with clockwise and anticlockwise motor（18）, and clockwise and anticlockwise motor（18）Output shaft run through tank
Lid（4）It is sequentially connected with paddle stirring blade（19）, the grinding pot（1）With mashing tank（3）Side bottom end be equipped with water outlet
Pipe（15）, and outlet pipe（15）End be connected with filter screen（16）, the grinding pot（1）With mashing tank（3）Bottom be located at
Filter screen（16）Side be respectively equipped with drainage conduit（17）And discharge nozzle（20）.
2. one kind harmless treatment device containing chromium soil according to claim 1, it is characterised in that：The grinding pot（1）
With mashing tank（3）Inner bottom be obliquely installed, and restore box（2）Bottom be funnel type.
3. one kind harmless treatment device containing chromium soil according to claim 1 or 2, it is characterised in that：Abrasive sheet（10）
Top be semicircular arc-shaped, and abrasive sheet（10）Surface be equipped with antiskid thread.
4. one kind harmless treatment device containing chromium soil according to claim 1-3, it is characterised in that：The outlet pipe
（15）, drainage conduit（17）Discharge nozzle（20）Inner tip be also all provided with by solenoid valve（11）, and it is beaten tank（3）Top cover（4）
Top nose also be provided with charge pipe（12）.
5. a kind of according to claim 1-4 any one of them method for innocent treatment containing chromium soil, which is characterized in that described
Processing method includes the following steps：
S1, elder generation chromium slag and contaminated soil are added in grinding pot from feed hopper, while being added clearly in grinding pot from water injection pipe
Then water controls variable-frequency motor and mill ball is driven to be rotatably assorted abrasive sheet to soil progress wet-milling；
Then S2, wet-milling are ground containing solenoid valve is opened after chromium soil grinding pot inner bottom is passed through containing chromium soil from charge pipe is past
Injection acid solution enters acidification in grinding jar, and PH sensor and LED display is coordinated to observe the acid-base value of solution in real time；
S3, it does not make the solenoid valve in water pipe in rebound time control when ph values and opens, makes filtering out impurity under the cooperation of filter screen
Liquid enters in reduction box, while being successively added in reduction box and reconciling liquid and sulphur, and first the pH value of solution is mediated,
Solution is restored；
From reduction cassette bottom portion, outlet pipe enters mashing tank to solution after S4, reduction after filter screen filters out impurity, controls simultaneously
Solenoid valve inside drainage conduit is opened, and mashing tank is added in the impurity in grinding pot, the filter cake restored at this time in box can carry out
Market sale；
S5, clockwise and anticlockwise motor band movable paddle type stirring blade rotation is controlled again while reducing agent is added in mashing tank from charge pipe,
So that mashing between solution and impurity is reacted, using acid passivation is adjusted, cures, so that filtrate is entered in liquid-collecting box after filtering, and filter plate
It is discharged from discharge nozzle as progress roadbed embedding material；
S6, solution in pump handle liquid-collecting box is finally utilized to be pumped into recycling in grinding pot.
6. a kind of method of harmless treatment containing chromium soil according to claim 5, it is characterised in that：In the step S1
Detection soil is carried out again when being higher than 0.5% containing chromium plus water operation, and water addition ratio example 1：0.5 to 1：5.
7. a kind of method of harmless treatment containing chromium soil according to claim 5, it is characterised in that：In the step S2
Acid include sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, acetic acid is one or more in lactic acid and citric acid.
8. a kind of method of harmless treatment containing chromium soil according to claim 5, it is characterised in that：In the step S4
Cr VI is filtered after being less than 0.5ppm in solution after reduction, and total chromium is less than 1.5ppm, sexavalence in leachate in step S5
Chromium is filtered after being less than 0.5ppm.
9. a kind of method of harmless treatment containing chromium soil according to claim 5, it is characterised in that：In the step S5
Reducing agent is ferrous sulfate, sodium pyrosulfite, sodium hydrogensulfite, sodium thiosulfate or vitamins ascorbic acid.
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