CN114345549A - Method and device for removing heavy metal Cr in thermal desorption flue gas of polluted soil - Google Patents
Method and device for removing heavy metal Cr in thermal desorption flue gas of polluted soil Download PDFInfo
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- CN114345549A CN114345549A CN202210107157.9A CN202210107157A CN114345549A CN 114345549 A CN114345549 A CN 114345549A CN 202210107157 A CN202210107157 A CN 202210107157A CN 114345549 A CN114345549 A CN 114345549A
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Abstract
The invention discloses a method and a device for removing heavy metal Cr in thermal desorption flue gas of polluted soil, wherein the removing device comprises a magnetic separation adsorption device, the magnetic separation adsorption device is arranged between a cooling device and a bag-type dust collector, the cooling device is communicated with a secondary combustion chamber of an incineration device, and the flue gas enters the bag-type dust collector through the secondary combustion chamber, the cooling device and the magnetic separation adsorption device in sequence.
Description
Technical Field
The invention belongs to the technical field of restoration of polluted sites in ecological environment protection, and relates to a method and a device for removing heavy metal Cr in thermal desorption flue gas of polluted soil.
Background
The direct-fired ex-situ thermal desorption treatment technology has the advantages of high treatment efficiency, short period and the like, and is widely applied to the remediation of organic polluted sites.
The direct combustion type thermal desorption technology is used for treating the enrichment phenomenon of heavy metals in collected dust by using a bag-type dust collector generated in the process of treating specific polluted soil; furthermore, the current way of handling the dust is to dispose of it at the same time as the soil after thermal desorption, which potentially affects the ecological environment.
Patent CN111888890A discloses a system and method for circularly trapping coal-fired flue gas mercury by using magnetic adsorbent, the system includes an electrostatic dust collector, a dust separator, an adsorbent regenerator and an adsorbent injector which are arranged in sequence, a flue is arranged between the electrostatic dust collector and the adsorbent injector, the electrostatic dust collector, the dust separator, the adsorbent regenerator and the adsorbent injector form a circulation loop, the electrostatic dust collector is used for separating clean flue gas from magnetic adsorbent which adsorbs mercury, the dust separator is used for separating dust from magnetic adsorbent, the adsorbent regenerator is used for regenerating adsorbent and desorbing adsorbed mercury by heating, and the adsorbent injector realizes that regenerated magnetic adsorbent is re-injected into the flue. But this system presents a problem for subsequent disposal of the adsorbent material.
Therefore, a method and a device for removing heavy metal Cr in thermal desorption flue gas of polluted soil are needed to be designed to solve the technical problems existing at present.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a method and a device for removing heavy metal Cr in thermal desorption flue gas of polluted soil, which have reasonable structure, realize the recovery of heavy metal Cr, and effectively avoid the potential influence of heavy metal enrichment on ecological environment; in addition, the recovery of heavy metal Cr is beneficial to the reutilization of resources.
In order to solve the technical problems, the device for removing the heavy metal Cr in the thermal desorption flue gas of the polluted soil comprises a magnetic separation adsorption device, wherein the magnetic separation adsorption device is arranged between a cooling device and a bag-type dust remover, the cooling device is communicated with a secondary combustion chamber of an incineration device, and the flue gas sequentially enters the bag-type dust remover through the secondary combustion chamber, the cooling device and the magnetic separation adsorption device; the magnetic separation adsorption device is of a tubular structure, a pair of adsorption plates are arranged in the magnetic separation adsorption device, the adsorption plates are arranged along the length direction of the magnetic separation adsorption device, flue gas passes through a cavity formed by the inner side walls of the pair of adsorption plates and the tubular structure, and the outer side walls of the adsorption plates and the tubular structure form a dust temporary storage bin; the magnetic separation adsorption device further comprises a recovery hopper, the recovery hopper moves up and down along the adsorption plate, and dust attached to the adsorption plate is transported to a dust temporary storage bin through the recovery hopper.
In a preferred embodiment, a bin gate is arranged at the upper part of the adsorption plate, and the recovery bucket is turned over at the bin gate to dump the dust in the recovery bucket to the dust temporary storage bin.
As a preferred embodiment, the magnetic separation adsorption device is of a circular tubular structure, and the adsorption plate is arranged along the length direction of the magnetic separation adsorption device.
In a preferred embodiment, the length of the recovery bucket is matched with that of the adsorption plate, the recovery bucket is parallel to the axial direction of the magnetic separation adsorption device, and the lower part of the recovery bucket is tightly attached to the adsorption plate.
In a preferred embodiment, a gap is provided between the ridge plate at the upper part of the recovery bucket and the adsorption plate.
As a preferred embodiment, the magnetic separation adsorption device comprises a slide rail, and the slide rail is arranged in parallel to the adsorption plate; the recovery hopper comprises a recovery hopper fixing part and a recovery hopper overturning part; the recovery bucket fixing part is fixed on the sliding rail through a lifting motor so as to enable the recovery bucket to move up and down along the sliding rail; the recycling hopper overturning part is connected with the overturning motor, and the recycling hopper overturning part is overturned relative to the recycling hopper fixing part so as to empty dust in the recycling hopper into the dust temporary storage bin.
As a preferred embodiment, the recovery bucket further comprises a contact assembly which is arranged at the lower edge of the recovery bucket; the contact assembly comprises a contact and a spring, and the spring pushes the contact to abut against the surface of the adsorption plate; the peripheral surface of contact is the circular arc structure, the contact subassembly contact in the surface of adsorption plate.
In a preferred embodiment, the adsorption plate is a magnetic adsorption plate, which generates a magnetic attraction force through an electromagnetic field, and dust formed by the heavy metal Cr in the flue gas is attached to the adsorption plate.
In a preferred embodiment, a dust collection bag connection port is disposed at the bottom of the dust temporary storage bin.
In addition, the invention also discloses a method for removing heavy metal Cr in the thermal desorption flue gas of the polluted soil, which uses the removing device and comprises the following steps:
s1, enabling the flue gas to enter a chamber of the magnetic separation adsorption device through a secondary combustion chamber and a cooling device of the incineration device;
s2, electrifying an adsorption plate in the magnetic separation adsorption device to generate an electromagnetic field, and attaching dust formed by the accompanying heavy metal Cr in the flue gas to the adsorption plate;
s3, a lifting motor in the magnetic separation adsorption device drives a recovery hopper to move to the upper bin gate from bottom to top along an adsorption plate on a slide rail, the bin gate is opened, a turnover motor drives a turnover part of the recovery hopper to turn over so as to dump dust in the recovery hopper to a dust temporary storage bin of the magnetic separation adsorption device, then the turnover motor drives the turnover part of the recovery hopper to turn over and return to an initial state, the bin gate is closed, and the lifting motor drives the recovery hopper to move to the bottom of a cavity from top to bottom along the adsorption plate on the slide rail;
and S4, the operator intensively recovers the dust containing the heavy metal Cr through the dust recovery bag connecting port of the magnetic separation adsorption device.
The invention has the beneficial effects that:
the method and the device for removing the heavy metal Cr in the thermal desorption flue gas of the polluted soil, which are provided by the invention, have reasonable structure, realize the recovery of the heavy metal Cr and effectively avoid the potential influence of heavy metal enrichment on the ecological environment; in addition, the recovery of heavy metal Cr is beneficial to the reutilization of resources.
Drawings
The above advantages of the present invention will become more apparent and more readily appreciated from the detailed description set forth below when taken in conjunction with the drawings, which are intended to be illustrative, not limiting, of the invention and in which:
FIG. 1 is a BCR sequential extraction diagram of heavy metals Cr and Ni;
FIG. 2 is a schematic diagram of a device for removing heavy metal Cr in thermal desorption flue gas of contaminated soil according to the invention;
FIG. 3 is a schematic structural diagram of the magnetic separation and adsorption device of the present invention;
FIG. 4 is a cross-sectional view of the magnetic separation and adsorption device of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
FIG. 6 is a schematic view of a recovery bucket positioned above an adsorption plate in the magnetic separation adsorption device of the present invention;
FIG. 7 is a schematic view of the recovery bucket on the track of the present invention relative to the adsorption plate;
fig. 8 is an enlarged view of the layout at B in fig. 7;
FIG. 9 is an enlarged view of the layout at C in FIG. 7;
FIG. 10 is a flow chart of the method for removing heavy metal Cr in the thermal desorption flue gas of the contaminated soil according to the invention.
In the drawings, the reference numerals denote the following components:
10. a magnetic separation adsorption device; 10a. a chamber; 10b, temporarily storing the dust in a bin;
11. an adsorption plate;
12. a recovery hopper; 12a, a recovery bucket fixing part; 12b, a turnover part of the recovery hopper; 12c. a contact assembly;
13. a bin gate; 14. a hoisting motor;
15. turning over a motor; 16. a dust recovery bag connecting port; 17. a slide rail;
20. a cooling device;
30. a bag-type dust collector;
40. and a second combustion chamber.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.
The final outlet of the direct-fired thermal desorption process is not only the soil treated by the thermal desorption of the rotary kiln, but also a large amount of dust collected at the dust remover. The problem that the bag-type dust collector collects heavy metals in dust is worth paying attention to when organic contaminated soil is treated through a thermal desorption process. The heavy metal in the dust in the thermal desorption system is seriously enriched, and the air quality of the surrounding environment of the thermal desorption site and the post-treatment problem of the dust are seriously damaged.
According to experimental data, the phenomenon of total enrichment of heavy metal Cr in a dust sample is obvious in a direct-fired thermal desorption bag-type dust remover, and as shown in table 1, compared with a soil sample after thermal desorption, the enrichment times of Ni and Cr are the closest and are respectively 3.1 times and 3.7 times. The total concentration of the original soil sample and the soil sample after thermal desorption is lower than a first screening value of a construction land specified in the national standard, the total concentration of Ni in the dust is far higher than the first screening value of the construction land and is close to 2 times of the screening value, and the total concentration of Cr is far higher than the screening value of Cr (VI) in the national standard.
TABLE 1 heavy Metal concentration Table
Further, the proportion of active heavy metal ions in the soil is measured, and the change trend of the residue state and the change trend of the weak acid extractable state in three types of samples are found to be the same in a BCR (bulk continuous cycle) sequential extraction experiment, and as shown in figure 1, the change trend is firstly reduced and then increased in the original soil sample, the soil sample after thermal desorption and dust. Based on the above research results, if the dust is directly backfilled for disposal or reuse, the dust can become a heavy metal pollution source in the environment.
Further, in order to better treat two heavy metals of Cr and Ni which exceed the screening value, the occurrence forms of Cr and Ni are further researched, and the results of SEM-EDS show that the Cr and Ni generate aggregation phenomenon in the thermal desorption process and occur together with Fe, namely, particles which take Fe-Cr-Ni as a main/important component and have magnetism are formed.
Based on the above research, the schematic diagram of the device for removing the heavy metal Cr in the thermal desorption flue gas of the contaminated soil, as shown in fig. 2, includes a magnetic separation adsorption device 10, the magnetic separation adsorption device 10 is disposed between a cooling device 20 and a bag-type dust collector 30, the cooling device 20 is communicated with a secondary combustion chamber 40 of an incineration device, and the flue gas sequentially enters the bag-type dust collector 30 through the secondary combustion chamber 40, the cooling device 20 and the magnetic separation adsorption device 10.
Further, the magnetic separation adsorption device 10 is of a tubular structure, as shown in fig. 3, a pair of adsorption plates 11 shown in fig. 4 is arranged inside the magnetic separation adsorption device 10, the adsorption plates 11 are arranged along the length direction of the magnetic separation adsorption device 10, flue gas passes through a chamber 10a formed by the inner side walls of the pair of adsorption plates 11 and the tubular structure, and the outer side wall of the adsorption plate 11 and the tubular structure form a dust temporary storage bin 10 b;
the magnetic separation adsorption device 10 further comprises a recovery hopper 12, and the recovery hopper 12 transports the dust attached to the adsorption plate 11 to the dust temporary storage bin 10b from bottom to top through the recovery hopper 12. Because the magnetic separation adsorption device adsorbs magnetic dust particles in the dynamic flow process of flue gas, the dust cleaning mode of the adsorption plate 11 does not need a vibration mode, and the vibration mode is used for preventing the magnetic particles from being taken away under the normal flow of the flue gas or leading the particles to be irregularly scattered in the device after the adsorption plate is vibrated and knocked, so that the particles are not beneficial to recovery.
In the embodiment shown in fig. 4, a bin gate 13 is disposed at the upper part of the adsorption plate 11, and the recovery bucket 12 is turned over at the bin gate 13 to dump the dust in the recovery bucket 12 to the dust temporary storage bin 10b.
In order to facilitate smooth gas path and avoid dead angle deposition of particles in the equipment caused by physical impact, the magnetic separation adsorption device 10 is set to be a circular tubular structure, and the two combustion chambers at the front end and the cooling device are both cylindrical, so that the whole set of equipment can be more harmonious and attractive.
The adsorption plate 11 is arranged along the length direction of the magnetic separation adsorption device 10. The length of the recovery bucket 12 matches with the length of the adsorption plate 11, and the recovery bucket is parallel to the axial direction of the magnetic separation adsorption device 10, and the lower part of the recovery bucket is tightly attached to the adsorption plate 11.
A gap is provided between the edge plate at the upper part of the recovery bucket 12 and the adsorption plate 11, as shown in fig. 5. When the recycling hopper 12 moves from bottom to top along the adsorption plate 11, the dust can be thoroughly scraped into the recycling hopper through the gap. The lower part of the collection bucket 12 is closely attached to the adsorption plate 11 to collect the dust attached to the adsorption plate 11 into the collection bucket 12. And adopt from bottom to top mode to strike off and collect the dust in order to retrieve the dust temporary storage storehouse 10b to both sides, because if adopt from top to bottom mode to strike off, then need set up the export that the dust was retrieved in the cavity 10a lower part of flue gas circulation, and need set up extra dust temporary storage storehouse and bin gate, avoid the dust to be taken away to next link by new flue gas again, its two, if meet abnormal conditions equipment outage back, the adsorption plate only has residual magnetism, partial dust particulate matter drops, therefore, when retrieving the intermittent type of fighting and not upwards striking off, stay in cavity 10a bottom, can also retrieve these magnetic dust particles, can not let these magnetic dust particles be taken away by new flue gas once more and cause the pollution to the environment.
The magnetic separation adsorption device 10 comprises a slide rail 17, wherein the slide rail 17 is arranged in parallel to the adsorption plate 11, as shown in fig. 7; the recovery bucket 12 includes a recovery bucket fixing portion 12a and a recovery bucket turning portion 12b, as shown in fig. 8 and 9; the recycling hopper fixing part 12a is fixed on the slide rail 17 through a lifting motor 14, so that the recycling hopper moves up and down along the slide rail, and the vertical position of the recycling hopper 12 is changed; the recycling hopper overturning part 12b is connected with an overturning motor 15, so that the recycling hopper overturning part 12b is overturned relative to the recycling hopper fixing part 12a, and the dust in the recycling hopper 12 is dumped into the dust temporary storage bin 10b.
Further, the recycling bin 12 further includes a contact assembly 12c disposed at a lower edge of the recycling bin 12; the contact assembly 12c includes a contact and a spring, as shown in fig. 8, the spring pushes the contact to abut against the surface of the adsorption plate 11; wherein, the contact is a plate-shaped structure and is arranged along the length direction of the recovery bucket 12.
The outer peripheral surface of the contact end is in an arc structure, and the contact assembly 12c is in contact with the surface of the adsorption plate 11. Under the action of the spring, the contact of the arc structure is tightly abutted against the surface of the adsorption plate 11 to collect the dust attached to the adsorption plate 11. When the bin mouth is reached, the turnover part 12b of the recovery bucket overturns, the contact of the contact assembly 12c loses the abutting of the adsorption plate 11 and extends out of a part to the dust temporary storage bin 10b under the action of the spring, and by the arrangement, the dust in the recovery bucket 12 cannot fall into the cavity 10a during overturning.
In an embodiment of the present invention, the adsorption plate 11 is a magnetic adsorption plate, which generates a magnetic attraction force through an electromagnetic field, and dust formed by the heavy metal Cr in the flue gas adheres to the adsorption plate 11.
In the embodiment shown in fig. 2, a dust collection bag connection port 16 is provided at the bottom of the dust temporary storage bin 10b to collectively handle collected dust particles containing heavy metal Cr.
The present invention designs a non-magnetic high temperature resistant recovery hopper 12, which works intermittently and designs a suitable working time according to different textures of the treated soil and different amounts of generated dust. The dust temporary storage bin 10b (left/right bin) is respectively provided with a bin door 13 and a controllable switch for closing and opening the bin opening.
During each work, the dust recovery bag connecting port 16 is closed, the recovery hopper 12 clings to the adsorption plate 11 to slide upwards along the wall, magnetic dust particles are scraped and recovered into the recovery hopper 12 until the bin mouth in the schematic diagram of fig. 7, the left/right bin mouths are opened by utilizing control equipment, the contact part extends into the dust temporary storage bin 10b on the other side of the adsorption plate 11, the recovery hopper 12 is turned over, the collected magnetic dust particles are dumped into the left/right bin, then the bin mouths are closed, the recovery hopper 12 returns to the state shown in fig. 4, 1 circulation is completed, and the next work is waited.
Meanwhile, the invention also discloses a method for removing heavy metal Cr in the thermal desorption flue gas of the polluted soil, which uses the removing device, and the flow chart of the method is shown in figure 10 and comprises the following steps:
s1, the flue gas enters the chamber 10a of the magnetic separation adsorption device 10 through the secondary combustion chamber 40 and the cooling device 20 of the incineration device;
s2, electrifying the adsorption plate 11 in the magnetic separation adsorption device 10 to generate an electromagnetic field, and attaching dust formed by the heavy metal Cr in the flue gas to the adsorption plate 11;
s3, the lifting motor 14 in the magnetic separation adsorption device 10 drives the recovery bucket 12 to move to the upper bin gate 13 from bottom to top along the adsorption plate 11 on the slide rail 17, the bin gate 13 is opened, and the turnover motor 15 drives the turnover part 12b of the recovery bucket to turn over so as to dump the dust in the recovery bucket 12 to the dust temporary storage bin 10b of the magnetic separation adsorption device 10; then, the turnover motor 15 drives the turnover part 12b of the recovery bucket to turn over and return to the initial state, the bin door 13 is closed, and the lifting motor 14 drives the recovery bucket 12 to move from top to bottom on the slide rail 17 to the bottom of the cavity 10a along the adsorption plate 11;
s4, the operator collects the dust containing the heavy metal Cr through the dust collection bag connection port 16 of the magnetic separation/adsorption apparatus 10.
In the invention, the polluted soil has associated and enriched phenomena of heavy metals Cr and Ni in dust under the action of the secondary combustion chamber 40 of the incineration device, and the heavy metals Cr and Ni are gathered on iron oxide particles. The invention rapidly removes Cr by a magnetic separation mode by means of the magnetism of other elements in 'associated' dust particles, and realizes the resource recycling of metals such as Fe-Cr-Ni.
The dust sample generally has a smaller particle distribution, and in some embodiments the dust particle size is measured in the range of 0-30 μm, d0.54.65 μm, high fluidity, easy diffusion to the atmosphere, and high environmental risk, therefore, the embodiment shown in fig. 2 is added with the applicable magnetic separation and adsorption device 10 according to the power of the air pump and the particle size range of the particles.
According to the invention, the magnetic adsorption device 10 is additionally arranged behind the second combustion chamber and the cooling device and in front of the bag-type dust remover to absorb and collect metal particles with high iron or nickel element proportion and prevent the metal particles from entering the bag-type dust remover.
Compared with the defects and shortcomings of the prior art, the device and the method for removing the heavy metal Cr in the thermal desorption flue gas of the polluted soil provided by the invention have the advantages that the structure is reasonable, the recovery of the heavy metal Cr is realized, and the potential influence of heavy metal enrichment on the ecological environment is effectively avoided; in addition, the recovery of heavy metal Cr is beneficial to the reutilization of resources.
The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.
Claims (9)
1. The device for removing the heavy metal Cr in the thermal desorption flue gas of the polluted soil is characterized by comprising a magnetic separation adsorption device (10), wherein the magnetic separation adsorption device (10) is arranged between a cooling device (20) and a bag-type dust remover (30), the cooling device (20) is communicated with a secondary combustion chamber (40) of an incineration device, and the flue gas enters the bag-type dust remover (30) through the secondary combustion chamber (40), the cooling device (20) and the magnetic separation adsorption device (10) in sequence; the magnetic separation adsorption device (10) is of a tubular structure, a pair of adsorption plates (11) is arranged in the magnetic separation adsorption device (10), the adsorption plates (11) are arranged along the length direction of the magnetic separation adsorption device (10), flue gas passes through a chamber (10a) formed by the inner side walls of the pair of adsorption plates (11) and the tubular structure, and the outer side wall of each adsorption plate (11) and the tubular structure form a dust temporary storage bin (10 b); the magnetic separation adsorption device (10) further comprises a recovery hopper (12), wherein the recovery hopper (12) moves up and down along the adsorption plate (11), and dust attached to the adsorption plate (11) is transported to the dust temporary storage bin (10b) through the recovery hopper (12).
2. The removing apparatus according to claim 1, wherein a bin gate (13) is provided at an upper portion of the adsorption plate (11), and the recovery bucket (12) is turned over at the bin gate (13) to dump the dust in the recovery bucket (12) to the dust temporary storage bin (10 b).
3. The removal device according to claim 1 or 2, characterized in that the length of the recovery bucket (12) matches the length of the adsorption plate (11), it is parallel to the axial direction of the magnetic separation adsorption device (10) and its lower part is arranged in close proximity to the adsorption plate (11).
4. The removal device according to claim 1 or 2, wherein a gap is provided between the upper edge plate of the recovery bucket (12) and the adsorption plate (11).
5. The removing device according to any one of claims 1 to 4, wherein the magnetic separation adsorption device (10) comprises a slide rail (17), and the slide rail (17) is arranged in parallel to the adsorption plate (11); the recovery bucket (12) comprises a recovery bucket fixing part (12a) and a recovery bucket overturning part (12 b); the recovery bucket fixing part (12a) is fixed on the sliding rail (17) through a lifting motor (14) so that the recovery bucket (12) moves up and down along the sliding rail (17); the recycling hopper overturning part (12b) is connected with an overturning motor (15), so that the recycling hopper overturning part (12b) is overturned relative to the recycling hopper fixing part (12a) to dump dust in the recycling hopper (12) into the dust temporary storage bin (10 b).
6. The removal device according to claim 5, characterized in that the recovery bucket (12) further comprises a contact assembly (12c) arranged at a lower edge of the recovery bucket (12); the contact assembly (12c) comprises a contact and a spring, and the spring pushes the contact to abut against the surface of the adsorption plate (11); the peripheral surface of the contact is in an arc structure, and the contact assembly (12c) is in contact with the surface of the adsorption plate (11).
7. The removing device according to any one of the preceding claims, characterized in that the adsorption plate (11) is a magnetic adsorption plate, which generates magnetic attraction force through an electromagnetic field, and dust formed by the heavy metal Cr in the flue gas is attached to the adsorption plate (11).
8. The removal device according to any one of the preceding claims, characterized in that the bottom of the dust temporary storage bin (10b) is provided with a dust recovery bag connection port (16).
9. A method for removing heavy metal Cr in thermal desorption flue gas of polluted soil, which is characterized in that the removing device of any one of claims 1 to 8 is used, and comprises the following steps:
s1, the flue gas enters a chamber (10a) of the magnetic separation adsorption device (10) through a secondary combustion chamber (40) of the incineration device and a cooling device (20);
s2, electrifying an adsorption plate (11) in the magnetic separation adsorption device (10) to generate an electromagnetic field, and attaching dust formed by the heavy metal Cr in the flue gas to the adsorption plate (11);
s3, a lifting motor (14) in the magnetic separation adsorption device (10) drives a recovery hopper (12) to move to the upper bin gate (13) from bottom to top along an adsorption plate (11) on a slide rail 17, the bin gate (13) is opened, a turnover motor (15) drives a recovery hopper turnover part (12b) to turn over so as to dump dust in the recovery hopper (12) to a dust temporary storage bin (10b) of the magnetic separation adsorption device (10), then the turnover motor (15) drives the recovery hopper turnover part (12b) to turn over to return to an initial state, the bin gate (13) is closed, and the lifting motor (14) drives the recovery hopper (12) to move to the bottom of a cavity (10a) from top to bottom along the adsorption plate (11) on the slide rail (17);
s4, the operator collects the dust containing the heavy metal Cr through the dust collection bag connection port (16) of the magnetic separation and adsorption device (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210107157.9A CN114345549A (en) | 2022-01-28 | 2022-01-28 | Method and device for removing heavy metal Cr in thermal desorption flue gas of polluted soil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210107157.9A CN114345549A (en) | 2022-01-28 | 2022-01-28 | Method and device for removing heavy metal Cr in thermal desorption flue gas of polluted soil |
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| CN202210107157.9A Pending CN114345549A (en) | 2022-01-28 | 2022-01-28 | Method and device for removing heavy metal Cr in thermal desorption flue gas of polluted soil |
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