CN109847565B

CN109847565B - Mercury recovery device of mercury-containing waste gas

Info

Publication number: CN109847565B
Application number: CN201910222169.4A
Authority: CN
Inventors: 陈扬; 冯钦忠; 蒋芳
Original assignee: Zhongke Jingtou Environmental Science And Technology Jiangsu Co ltd
Current assignee: Zhongke Jingtou Environmental Science And Technology Jiangsu Co ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2024-02-13
Anticipated expiration: 2039-03-22
Also published as: CN109847565A

Abstract

The invention discloses a mercury recovery device for mercury-containing waste gas, which belongs to the field of mercury-containing waste gas treatment equipment and comprises a heating furnace, a reaction box body, a screening recovery device, a condensation tank body and an induced draft fan, wherein a first connecting pipeline is arranged between the heating furnace and the reaction box body, an electromagnetic valve is arranged on the first connecting pipeline, a second connecting pipeline is arranged between the reaction box body and the condensation tank body, a discharge pipeline is arranged at the bottom of the reaction box body, an iodine solution storage box is arranged at the top of the reaction box body, a first spraying device is arranged in the reaction box body, a circulating pumping assembly is arranged between the iodine solution (KI solution) storage box and the screening recovery device, a supporting frame is arranged on the side wall of the condensation tank body close to the top, a condensed water storage tank is arranged on the supporting frame, a second spraying device is arranged in the condensation tank body, a mercury receiving container is arranged at the bottom of the condensation tank body, an exhaust pipeline is arranged on the side wall of the condensation tank body, and the induced draft fan is arranged on the exhaust pipeline. The invention realizes effective treatment and recovery of mercury in the mercury-containing waste gas, and avoids environmental pollution.

Description

Mercury recovery device of mercury-containing waste gas

Technical Field

The invention relates to the field of mercury-containing waste gas treatment equipment, in particular to a mercury recovery device for mercury-containing waste gas.

Background

Mercury is a pollutant which can exist in the environment for a long time and has global mobility, and the sources of atmospheric mercury mainly comprise coal burning, nonferrous metal smelting, mercury mine exploitation, mercury-containing waste treatment and the like. Mercury and its compounds enter the human body through different routes of respiratory tract, and some directly produce harm, and some accumulate, which can seriously harm the health of the human body. A viable mercury-containing waste gas treatment plant is to be developed to achieve effective treatment and recovery of mercury.

Disclosure of Invention

The present invention is directed to a mercury recovery apparatus for mercury-containing waste gas, which solves the problems set forth in the background art.

The invention provides a mercury recovery device for mercury-containing waste gas, which comprises a heating furnace, a reaction tank body, a screening recovery device, a condensation tank body and an induced draft fan, wherein the condensation tank body is positioned at the side of the heating furnace, the screening recovery device is positioned between the heating furnace and the condensation tank body, the reaction tank body is positioned right above the screening recovery device, a first connecting pipeline for communicating the heating furnace and the reaction tank body is arranged between the heating furnace and the reaction tank body, an electromagnetic valve is arranged on the first connecting pipeline, a second connecting pipeline for communicating the reaction tank body and the condensation tank body is arranged between the reaction tank body and the condensation tank body, a discharge pipeline communicated with the reaction tank body is arranged at the bottom of the reaction tank body, an iodine liquid storage tank is arranged at the top of the reaction tank body, a circulation and delivery assembly for communicating the iodine liquid storage tank and the screening recovery device is arranged between the reaction tank body and the condensation tank body, a support frame is arranged on the side wall of the condensation tank body close to the top, a second spraying device communicated with the storage tank is arranged in the condensation tank body, a discharge pipeline communicated with the condensation tank body is arranged at the bottom of the condensation tank body, and the induced draft fan is arranged on the side wall of the condensation tank.

Further, the first sprinkler is the same with the structure of second sprinkler and all includes first water pump, fluid-discharge tube, connecting pipe and a plurality of evenly setting up the sprinkler tube at connecting pipe, first water pump is installed on the fluid-discharge tube, connecting pipe is the bottom of horizontal connection at the fluid-discharge tube, all is equipped with the sprinkler head that a plurality of equidistant setting on every sprinkler tube.

Further, the screening recovery device comprises a connecting plate, a screening shell, a screening assembly, a balance assembly and two vibration motors, wherein the balance assembly is arranged on the connecting plate, the screening shell is arranged on the balance assembly, the screening assembly is arranged in the screening shell, and the two vibration motors are arranged on the side walls of the screening shell.

Further, the screening subassembly includes first screening swash plate, second screening swash plate and third screening swash plate, first screening swash plate, second screening swash plate are the alternative arrangement in screening casing with the third screening swash plate, and the three is with screening casing inner space separation for first space, second space, third space and fourth space, be equipped with a plurality of first screening hole on the first screening swash plate, be equipped with a plurality of second screening hole on the second screening swash plate, be equipped with a plurality of third screening hole on the third screening swash plate, the aperture of first screening hole is greater than the aperture of second screening hole, and the aperture of second screening hole is greater than the aperture of third screening hole, be equipped with on the screening casing lateral wall with first collection box of first space intercommunication, with the second collection box of second space intercommunication and with the third collection box of third space intercommunication.

Further, the circulation pumping assembly comprises a second water pump and a hose, a first pipeline communicated with the back of the iodine solution storage box is arranged at the back of the iodine solution storage box, a second pipeline communicated with a fourth space is arranged at the bottom of the screening shell, the second water pump is arranged on the second pipeline, and two ends of the hose are connected with the first pipeline and the second pipeline respectively.

Further, the balance assembly comprises four balance assemblies which are distributed in a rectangular mode, four U-shaped plates which are in one-to-one correspondence with the four balance assemblies are arranged on the outer wall of the screening shell, the balance assemblies comprise balance columns and balance springs, the balance columns are vertically arranged on the connecting plates, the balance springs are sleeved on the balance columns, and the bottoms of the balance springs are connected to the corresponding U-shaped plates.

Further, the top of iodine solution bin is equipped with the feeder hopper rather than inside intercommunication, be equipped with sealed lid on the feeder hopper.

Further, the iodine solution storage tank and the condensed water storage tank are internally provided with liquid level meters.

Compared with the prior art, the invention has the beneficial effects that:

firstly, the heating furnace can heat the mercury-containing waste gas, the iodine solution in the iodine solution storage box can be extracted through the first spraying device to spray, part of the mercury-containing waste gas in the reaction box can form solid mercury iodide with the iodine solution, the solid mercury iodide enters the screening and recycling device through the discharge pipeline, the solid mercury iodide can be screened and recycled through the screening and recycling device, and the iodine solution which does not form reaction can be pumped into the iodine solution storage box by the circulating pumping assembly, so that the purpose of recycling the iodine solution is achieved.

Secondly, the condensed water in the condensed water storage tank can be extracted through the second spraying device to spray, the interior of the condensed tank body is cooled, mercury can be separated out after the rest mercury-containing waste gas in the condensed tank body is cooled, the separated mercury flows into the mercury receiving container, and the induced draft operation can be carried out on the mercury-containing waste gas through the induced draft fan, and the pressure in the reaction box body and the condensed tank body can be increased, so that the recovery of mercury is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a first angular perspective structure of the present invention;

FIG. 2 is a schematic view of a second angle perspective structure of the present invention;

FIG. 3 is an enlarged view of FIG. 2 at A;

FIG. 4 is a partial cross-sectional view of the present invention;

FIG. 5 is an enlarged view at B in FIG. 4;

FIG. 6 is a schematic perspective view of a screening recovery apparatus;

FIG. 7 is a top view of the screen recovery apparatus;

FIG. 8 is a cross-sectional view taken along line C-C of FIG. 7;

reference numerals: the heating furnace 1, the first connection pipe 1a, the electromagnetic valve 1b, the reaction tank 2, the discharge pipe 2a, the iodine solution storage tank 3, the first pipe 3a, the feed hopper 3b, the seal cap 3b1, the screening recovery device 4, the connection plate 4a, the screening housing 4b, the first space 4b1, the second space 4b2, the third space 4b3, the fourth space 4b4, the first collection box 4b5, the second collection box 4b6, the third collection box 4b7, the second pipe 4b8, the U-shaped plate 4b9, the screening assembly 4c, the first screening inclined plate 4c1, the second screening inclined plate 4c2, the third screening inclined plate 4c3, the first screening hole 4c4, the balance assembly 4d, the balance column 4d1, the balance spring 4d2, the vibration motor 4e, the condensation tank 5, the second connection pipe 5a, the support frame 5b, the storage tank 5c, the mercury receiving container 5d, the induced draft fan 7, the first device 7, the first water pump 7a, the second pipe 7b, the discharge pipe 7c 7d, the second water pump assembly 8b, the spray pipe 8 d, the spray hose assembly 8b, the spray hose assembly 8.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown.

The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 8, the embodiment of the invention provides a mercury recovery device for mercury-containing waste gas, which comprises a heating furnace 1, a reaction tank 2, a screening recovery device 4, a condensation tank 5 and an induced draft fan 6, wherein the condensation tank 5 is positioned beside the heating furnace 1, the screening recovery device 4 is positioned between the heating furnace 1 and the condensation tank 5, the reaction tank 2 is positioned right above the screening recovery device 4, a first connecting pipeline 1a for communicating the heating furnace 1 and the reaction tank 2 is arranged between the heating furnace 1 and the reaction tank 2, a solenoid valve 1b is arranged on the first connecting pipeline 1a, a second connecting pipeline 5a for communicating the reaction tank 2 and the condensation tank 5 is arranged between the reaction tank 2 and the condensation tank 5, an iodine solution storage tank 3 is arranged at the top of the reaction tank 2, a first spraying device 7 communicated with the iodine solution storage 3 is arranged in the reaction tank 2, a first connecting pipeline 1a for communicating the iodine solution storage 3 with the screening device 4 is arranged between the heating furnace 1 and the reaction tank 2, a second connecting pipeline 5b is arranged on the condensation tank 5, a second connecting pipeline 5c is arranged on the condensation tank 5 and is arranged on the condensation tank 5, a side wall of the condensation tank 5 is communicated with the condensation tank 5, and a side wall of the condensation tank 5 is arranged on the condensation tank 5, and the side wall of the condensation tank is communicated with the condensation tank is arranged, and the condensation tank is provided with the side wall of the condensation tank is provided with the condensation tank 5.

Specifically, as shown in fig. 3 to 5, fig. 3 is an enlarged view at a in fig. 2, fig. 4 is a partial sectional view of the present invention, and fig. 5 is an enlarged view at B in fig. 4; the first spraying device 7 and the second spraying device 9 have the same structure and comprise a first water pump 7a, a liquid discharge pipe 7b, a connecting pipe 7c and a plurality of spraying pipes 7d uniformly arranged on the connecting pipe 7c, wherein the first water pump 7a is arranged on the liquid discharge pipe 7b, the connecting pipe 7c is horizontally connected to the bottom of the liquid discharge pipe 7b, and each spraying pipe 7d is provided with a plurality of spraying heads 7d1 which are arranged at equal intervals; the first water pump 7a pumps iodine liquid or condensed water into the liquid discharge pipeline 7b, then enters the connecting pipe 7c and all spraying pipes 7d from the liquid discharge pipeline 7b, finally sprays out from all spraying heads 7d1, the sprayed iodine liquid can form solid mercuric iodide with mercury-containing waste gas, and the sprayed condensed water can quickly cool the interior of the condensing tank body 5.

Specifically, as shown in fig. 2, 6 and 7, fig. 2 is a schematic view of a second angle perspective structure of the present invention, fig. 6 is a schematic perspective view of a screening and recovering device, and fig. 7 is a top view of the screening and recovering device; the screening and recycling device 4 comprises a connecting plate 4a, a screening shell 4b, a screening assembly 4c, a balance assembly 4d and two vibration motors 4e, wherein the balance assembly 4d is installed on the connecting plate 4a, the screening shell 4b is installed on the balance assembly 4d, the screening assembly 4c is installed in the screening shell 4b, and the two vibration motors 4e are installed on the side wall of the screening shell 4 b; two vibrating motors 4e can drive the screening housing 4b to shake, and the screening assembly 4c can screen and recover solid mercury iodide along with shake, and balance of the screening housing 4b can be maintained through the balance assembly 4 d.

Specifically, as shown in fig. 6 to 8, fig. 6 is a perspective view of the screening and recovering apparatus, fig. 7 is a plan view of the screening and recovering apparatus, and fig. 8 is a sectional view taken along line C-C in fig. 7; the screening assembly 4c comprises a first screening inclined plate 4c1, a second screening inclined plate 4c2 and a third screening inclined plate 4c3, the first screening inclined plate 4c1, the second screening inclined plate 4c2 and the third screening inclined plate 4c3 are alternately arranged in a screening shell 4b, the three separate the inner space of the screening shell 4b into a first space 4b1, a second space 4b2, a third space 4b3 and a fourth space 4b4, a plurality of first screening holes 4c4 are formed in the first screening inclined plate 4c1, a plurality of second screening holes are formed in the second screening inclined plate 4c2, a plurality of third screening holes are formed in the third screening inclined plate 4c3, the aperture of the first screening holes 4c4 is larger than that of the second screening holes, the aperture of the second screening holes is larger than that of the third screening holes, and a first collecting box 4b5 communicated with the first space 4b1, a second collecting box 4b6 communicated with the second space 4b2 and a third collecting box 4b3 are formed in the side wall of the screening shell 4 b; after the solid mercury iodide falls onto the first screening sloping plate 4c1 from the discharge pipeline 2a, larger mercury iodide is screened out through the first screening holes 4c4 and can fall into the first collecting box 4b5 for collecting, and the screening method of the residual solid mercury iodide is the same as that of the first screening sloping plate 4c1, so that the effective recovery of all the mercury iodide is realized, omission is avoided, and unreacted iodine liquid can enter the fourth space 4b 4.

Specifically, as shown in fig. 1, fig. 1 is a schematic view of a first angle perspective structure of the present invention; the circulating pumping assembly 8 comprises a second water pump 8a and a hose 8b, a first pipeline 3a communicated with the inside of the iodine solution storage box 3 is arranged at the back of the iodine solution storage box 3, a second pipeline 4b8 communicated with a fourth space 4b4 is arranged at the bottom of the screening shell 4b, the second water pump 8a is arranged on the second pipeline 4b8, and two ends of the hose 8b are respectively connected with the first pipeline 3a and the second pipeline 4b 8; the second water pump 8a can pump the iodine solution in the fourth space 4b4 into the second pipeline 4b8, and then the iodine solution is conveyed into the first pipeline 3a through the hose 8b, and finally the iodine solution can enter the iodine solution storage box 3, so that the purpose of recycling the iodine solution is achieved, and the waste of the iodine solution is avoided.

Specifically, as shown in fig. 6, fig. 6 is a schematic perspective view of the screening and recycling device; the balance assembly 4d comprises four balance assemblies 4d which are distributed in a rectangular shape, four U-shaped plates 4b9 which are in one-to-one correspondence with the four balance assemblies 4d are arranged on the outer wall of the screening shell 4b, the balance assemblies 4d comprise balance columns 4d1 and balance springs 4d2, the balance columns 4d1 are vertically arranged on the connecting plates 4a, the balance springs 4d2 are sleeved on the balance columns 4d1, and the bottoms of the balance springs 4d2 are connected to the corresponding U-shaped plates 4b 9; the balance of the sieving housing 4b is maintained by the restoring force of the four balance springs 4d 2.

Specifically, as shown in fig. 3, fig. 3 is an enlarged view at a in fig. 2; the top of the iodine solution storage box 3 is provided with a feed hopper 3b communicated with the inside of the iodine solution storage box, and the feed hopper 3b is provided with a sealing cover 3b1; the iodine solution can be rapidly added into the iodine solution storage box 3 through the feeding hopper 3b, and the volatilization of the iodine solution can be reduced through the sealing cover 3b 1.

Specifically, the iodine solution storage tank 3 and the condensed water storage tank 5c are respectively provided with a liquid level meter; the remaining amount of iodine solution in the iodine solution storage tank 3 and the remaining amount of condensed water in the condensed water storage tank 5c can be detected by the level gauge.

The working principle of the invention is as follows: the induced draft fan 6 can not only carry out induced draft operation on the mercury-containing waste gas, but also increase the pressure intensity in the reaction box body 2 and the condensation tank body 5; the heating furnace 1 can heat the mercury-containing waste gas, the heated mercury-containing waste gas can rise to enter the first connecting pipeline 1a, the electromagnetic valve 1b is opened, the mercury-containing waste gas can enter the reaction box body 2, then the first water pump 7a of the first spraying device 7 pumps the iodine liquid in the iodine liquid storage box 3 into the liquid discharge pipeline 7b, then the iodine liquid sprayed out of all the spraying heads 7d1 can form solid-state mercuric iodide with the mercury-containing waste gas, the solid-state mercuric iodide enters the first screening inclined plate 4c1 in the screening shell 4b through the discharge pipeline 2a, the larger mercuric iodide is screened out through the first screening hole 4c4 and can fall into the first collecting box 4b5 in a rolling way, the screening method of the residual solid-state iodized chemical is the same as that of the first screening inclined plate 4c1, therefore, the effective recovery of all the iodine liquid is avoided, the unreacted iodine liquid can enter the fourth space 4b, the second water pump 8a can enter the fourth space 4b, the iodine liquid can be circulated into the second water pump 8b through the first pipeline 8b, and the iodine liquid can be prevented from being wasted, and finally the iodine liquid can be circulated into the first collecting box 4b 3b through the second pipeline 8 b; the mercury-containing waste gas which does not finish the reaction can enter the condensation tank body 5 through the second connecting pipeline 5a, the first water pump 7a of the second spraying device 9 pumps the condensed water in the condensed water storage tank 5c into the liquid discharge pipeline 7b, and then the condensed water is sprayed out of all the spraying heads 7d1, the condensed water can quickly cool the interior of the condensation tank body 5, mercury can be separated out from the residual mercury-containing waste gas in the condensation tank body 5 after cooling, and the separated mercury flows into the mercury receiving container 5d for recycling.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. The mercury recovery device for mercury-containing waste gas is characterized by comprising a heating furnace (1), a reaction box body (2), a screening recovery device (4), a condensing tank body (5) and a draught fan (6), wherein the condensing tank body (5) is positioned beside the heating furnace (1), the screening recovery device (4) is positioned between the heating furnace (1) and the condensing tank body (5), the reaction box body (2) is positioned right above the screening recovery device (4), a first connecting pipeline (1 a) for communicating the heating furnace (1) and the reaction box body (2) is arranged between the heating furnace (1) and the reaction box body (2), an electromagnetic valve (1 b) is arranged on the first connecting pipeline (1 a), a second connecting pipeline (5 a) for communicating the reaction box body (2) and the condensing tank body (5) is arranged between the first connecting pipeline (1 a), the bottom of the reaction box body (2) is provided with a discharge pipeline (2 a) communicated with the inside of the reaction box body, the top of the reaction box body (2) is provided with an iodine solution storage box (3), the reaction box body (2) is internally provided with a first connecting pipeline (1 a) for communicating the first connecting component (7) with the first connecting component (5), the first connecting component (7) is arranged between the reaction box body and the first connecting component (5) and the first component (5), the device comprises a support frame (5 b), a condensate water storage tank (5 c), a second spraying device (9) communicated with the condensate water storage tank (5 c) is arranged in the condensate water storage tank (5), a mercury receiving container (5 d) communicated with the inside of the condensate water storage tank is arranged at the bottom of the condensate water storage tank (5), an exhaust pipeline is arranged on the side wall of the condensate water storage tank (5), and an induced draft fan (6) is arranged on the exhaust pipeline; the structure of the first spraying device (7) is the same as that of the second spraying device (9), the first spraying device comprises a first water pump (7 a), a liquid discharge pipe (7 b), a connecting pipe (7 c) and a plurality of spraying pipes (7 d) which are uniformly arranged on the connecting pipe (7 c), the first water pump (7 a) is arranged on the liquid discharge pipe (7 b), the connecting pipe (7 c) is horizontally connected to the bottom of the liquid discharge pipe (7 b), and a plurality of spraying heads (7 d 1) which are arranged at equal intervals are arranged on each spraying pipe (7 d).

2. The mercury recovery apparatus of claim 1, wherein the screening and recovery apparatus (4) comprises a connection plate (4 a), a screening housing (4 b), a screening assembly (4 c), a balancing assembly (4 d) and two vibration motors (4 e), the balancing assembly (4 d) is mounted on the connection plate (4 a), the screening housing (4 b) is mounted on the balancing assembly (4 d), the screening assembly (4 c) is mounted in the screening housing (4 b), and the two vibration motors (4 e) are mounted on the side walls of the screening housing (4 b).

3. The mercury recycling device of mercury-containing waste gas according to claim 2, wherein the screening assembly (4 c) comprises a first screening inclined plate (4 c 1), a second screening inclined plate (4 c 2) and a third screening inclined plate (4 c 3), the first screening inclined plate (4 c 1), the second screening inclined plate (4 c 2) and the third screening inclined plate (4 c 3) are alternately arranged in the screening shell (4 b), the three separate the inner space of the screening shell (4 b) into a first space (4 b 1), a second space (4 b 2), a third space (4 b 3) and a fourth space (4 b 4), a plurality of first screening holes (4 c 4) are formed in the first screening inclined plate (4 c 1), a plurality of second screening holes are formed in the second screening inclined plate (4 c 2), a plurality of third screening holes are formed in the third screening inclined plate (4 c 3), the aperture of the first screening holes (4 c 4) is larger than that of the second screening holes, the aperture of the second screening holes is larger than that of the third screening holes is formed in the third screening holes (4 b) and the first screening holes (4 b) are communicated with the first space (4 b) and the third collecting box (4 b) and the second collecting box (4 b) are communicated with the first space (4 b) and the second collecting box (4 b) respectively.

4. The mercury recycling apparatus for mercury-containing waste gas according to claim 3, wherein the circulating pumping assembly (8) comprises a second water pump (8 a) and a hose (8 b), a first pipeline (3 a) communicated with the inside of the iodine solution storage box (3) is arranged at the back of the iodine solution storage box, a second pipeline (4 b 8) communicated with a fourth space (4 b 4) is arranged at the bottom of the screening shell (4 b), the second water pump (8 a) is arranged on the second pipeline (4 b 8), and two ends of the hose (8 b) are respectively connected with the first pipeline (3 a) and the second pipeline (4 b 8).

5. The mercury recycling device of the mercury-containing waste gas according to claim 2, wherein the balance component (4 d) comprises four balance components (4 d) which are distributed in a rectangular shape, four U-shaped plates (4 b 9) which are in one-to-one correspondence with the four balance components (4 d) are arranged on the outer wall of the screening shell (4 b), the balance components (4 d) comprise balance columns (4 d 1) and balance springs (4 d 2), the balance columns (4 d 1) are vertically arranged on the connecting plates (4 a), the balance springs (4 d 2) are sleeved on the balance columns (4 d 1), and the bottoms of the balance springs (4 d 2) are connected to the corresponding U-shaped plates (4 b 9).

6. The mercury recovery apparatus for mercury-containing waste gas according to claim 1, wherein the top of the iodine solution storage tank (3) is provided with a feed hopper (3 b) communicated with the inside thereof, and the feed hopper (3 b) is provided with a sealing cover (3 b 1).