A system for treating exhaust gas from a sulfuric acid plant and a rare metal leaching plant

Abstract

The application discloses a kind of sulfuric acid and rare and precious metal recyclable leaching waste gas treatment system, it is related to copper anode slime leaching process technical field, including with each acid mist generating system connection's acid mist conveying pipeline and for driving acid mist flow's air extractor, still including electrostatic collection system, for directly separating and recycling in flowing acid mist acid mist particle and rare and precious metal;Wherein, the air inlet of the electrostatic collection system is sealingly connected with the gas outlet of the acid mist conveying pipeline, and the air outlet of the electrostatic collection system is connected with the air inlet of the air extractor.This system uses electrostatic collection system to separate and recycle rare and precious metal and sulfuric acid in acid mist, avoids the generation of waste water and can further reduce acid mist emission concentration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copper anode slime leaching process, and particularly relates to a leaching waste gas treatment system capable of recycling sulfuric acid and rare and precious metals. BACKGROUND

[0002] Copper anode slime is an anode material used in metal electrolysis process. When the copper anode slime is immersed in the electrolyte, the copper in its composition will gradually dissolve and enter the electrolyte, which is called dissolution or leaching of the copper anode slime.

[0003] In the process of copper anode slime acid leaching, a small amount of acid mist (sulfuric acid mist) is generated in some storage tanks, and the concentration of the sulfuric acid mist is about 100-200 mg / m3. The conventional process uses an acid mist absorption tower and alkali liquid absorption process (main equipment includes an air suction machine for guiding the flow of acid mist and an acid mist absorption tower for treating the acid mist). After treatment, the concentration of the acid mist is about 30 mg / m3, and waste water is generated, which is mainly the washing circulating liquid discharged. This process can effectively remove the acid mist in the waste gas, has the advantages of low investment and relatively low operating cost; however, as the impurities in the circulating liquid increase, the washing effect decreases, there is a risk of exceeding the standard, and the waste water generated simultaneously takes away the trace valuable metals (as the treated anode slime particles are fine, the acid mist contains trace amounts of valuable rare and precious metal (specifically gold, silver, platinum, palladium, etc.) dust particles, and the dust concentration is <2 mg / Nm3. The reaction of the acid mist with the alkali liquid causes the sulfuric acid in the acid mist to be consumed and the valuable rare and precious metals to enter the generated waste water), which is not conducive to the recycling of sulfuric acid and valuable rare and precious metals. Therefore, the present application provides a leaching waste gas treatment system capable of recycling sulfuric acid and rare and precious metals to meet the needs. SUMMARY

[0004] The present application aims to provide a leaching waste gas treatment system capable of recycling sulfuric acid and rare and precious metals, which solves the technical problem that sulfuric acid and valuable rare and precious metals in the acid mist cannot be recycled and reused in the process of copper anode slime acid leaching.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a leaching waste gas treatment system capable of recycling sulfuric acid and rare and precious metals, comprising an acid mist conveying pipeline connected with each acid mist generating system and an air suction machine for driving the flow of acid mist, and further comprising an electrostatic collection system for directly separating and recycling acid mist particles and rare and precious metals in the flowing acid mist.

[0006] The gas inlet of the electrostatic collection system is sealingly connected with the gas outlet end of the acid mist conveying pipeline, and the gas outlet of the electrostatic collection system is connected with the gas inlet end of the air suction machine.

[0007] Preferably, the electrostatic collection system comprises a shell with an air inlet and an air outlet, the inner cavity of the shell is vertically and oppositely provided with a cathode plate and an anode plate, a receiving box is arranged immediately below the anode plate, a drain pipe is installed at the lower end of the receiving box, a slag receiving box is detachably installed on the receiving box, and a corrosion-resistant filter is installed in the inner cavity of the slag receiving box for separation of dilute noble metals and sulfuric acid liquid.

[0008] Preferably, it also comprises an atomization system for dispersing larger droplets in the flowing acid mist.

[0009] Preferably, the atomization system comprises a mounting pipe connected to the air outlet end of the air blower, the air outlet end of the mounting pipe is densely covered with a plurality of conical acceleration pipes with conical cavities inside, the narrow air outlet ends of the plurality of conical acceleration pipes are respectively connected to corresponding air whistles through connecting pipes, the plurality of air whistles are arranged in N rows, and N air whistles are arranged in each row, the plurality of air whistles are arranged in a soundproof box made of soundproof material, the soundproof box is installed at the bottom of the shell, an air outlet pipe is arranged on the soundproof box, the shell is made of soundproof material, the part opposite to the soundproof box at the bottom of the shell is provided with an opening communicating with the inner cavity of the shell, and a sealing plate is sealingly installed in the opening, the soundproof box is arranged close to the air inlet end of the shell, and the air whistles are horizontally spaced apart from the anode plate by a distance L.

[0010] Preferably, it also comprises a blocking piece for reducing the length L, the blocking piece comprises N energy-consuming filter screens arranged in rows in the inner cavity of the shell, and the N energy-consuming filter screens are located between the soundproof box and the anode plate, the resonance frequency of the energy-consuming filter screens is inconsistent with the ultrasonic wave frequency emitted by the air whistles when the air whistles are working.

[0011] Preferably, it also comprises N resonance filter screens, the number of the energy-consuming filter screens is greater than the number of the resonance filter screens, the resonance frequency of the resonance filter screens is consistent with the ultrasonic wave frequency emitted by the air whistles when the air whistles are working, the resonance filter screens are located between the soundproof box and the anode plate, the resonance filter screens and the energy-consuming filter screens are fixedly connected through connecting rods, and the N resonance filter screens are arranged close to the air whistles.

[0012] Preferably, the upper and lower ends of the resonance filter screens and the energy-consuming filter screens are provided with sliding blocks, the sliding blocks are slidingly arranged in the sliding grooves provided on the inner walls of the shell, the end faces of the sliding blocks in contact with the sliding grooves are provided with rolling balls, and the sliding blocks of the outermost energy-consuming filter screens are fixedly connected with the inner walls of the sliding grooves through springs.

[0013] Preferably, the shell comprises a left half and a right half, the left half and the right half are connected by a flexible sound insulation piece, and the two ends of the exhaust fan are connected with the mounting pipe and the shell through flexible expansion pipes.

[0014] Preferably, the sealing plate is a thin plate, and the sealing plate is made of a low sound wave blocking material, and the working frequency of the sealing plate is inconsistent with the ultrasonic frequency generated by the air whistle when the air whistle works.

[0015] In summary, the technical effects and advantages of the present application are:

[0016] The present application has reasonable structure, the system adopts the electrostatic collection system to separate and recover the rare and precious metals and sulfuric acid in the acid mist, avoids the generation of waste water, and can further reduce the acid mist emission concentration.

[0017] In the present application, an atomization system is provided, and the large droplets in the acid mist are scattered by the atomization system, so that the large droplets are dispersed into small droplets, the surface area of the droplets is increased, the acting area of the electrostatic force is increased, the mass of the droplets is reduced, the influence of gravity on the droplets is reduced, and the droplets are more quickly gathered on the anode plate.

[0018] In the present application, the mounting pipe, the conical accelerating pipe, the connecting pipe and the air whistle form an atomization system, the treated gas is accelerated by the conical accelerating pipe and discharged from the connecting pipe by using the original exhaust fan, the flowing gas drives the air whistle to emit ultrasonic waves, the ultrasonic waves emitted by the air whistle scatter the large droplets in the acid mist, the power of the air whistle is provided by the original process exhaust fan, no additional power consumption and power source equipment are needed, electricity is effectively saved, and production cost is reduced.

[0019] In the present application, the blocking piece comprises N energy-consuming filter screens, the N energy-consuming filter screens are used to block the ultrasonic waves and consume the energy in the ultrasonic waves, so that there is not enough energy in the sound waves transmitted to the anode plate to scatter the large droplets on the anode plate.

[0020] In the present application, N resonance filter screens connected with the N energy-consuming filter screens form an integral whole, the resonance generated by the resonance filter screens drives the N energy-consuming filter screens to vibrate, and the vibration effect of the energy-consuming filter screens is improved, so that the droplets attached to the energy-consuming filter screens and the resonance filter screens are scattered by vibration.

[0021] In the present application, a sliding block, a spring and a ball are further included, and the purpose is to reduce the friction between the resonance filter screens, the energy-consuming filter screens and the shell, and to improve the overall vibration effect of the resonance filter screens and the energy-consuming filter screens. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of the present application;

[0024] Figure 2 Schematic diagram of the partially split structure of the present application;

[0025] Figure 3 Schematic diagram of the internal structure of the soundproof box in the present application; Figure 2

[0026] Figure 4 Schematic diagram of the blocking piece structure in the present application; Figure 2

[0027] Figure 5 Schematic diagram of the mounting pipe structure in the present application; Figure 2

[0028] Schematic diagram of the split structure of the sealing plate in the present application. Figure 6 Figure 2 In the figure: 1, electrostatic collection system; 101, shell; 102, material receiving box; 103, liquid discharge pipe; 104, anode plate; 105, cathode plate; 106, slag receiving box; 2, atomization system; 21, mounting pipe; 22, conical acceleration pipe; 23, connecting pipe; 24, air whistle; 25, sealing plate; 26, soundproof box; 27, exhaust pipe; 3, flexible soundproof piece; 4, blocking piece; 41, resonance filter screen; 42, energy consumption filter screen; 43, connecting rod; 44, ball; 45, sliding block; 46, spring.

[0029] Embodiment The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort also belong to the protection scope of the present application.

[0030] Embodiment: refer to

[0031] Figure 1 ​​​​The leaching waste gas treatment system for recyclable sulfuric acid and rare and precious metals shown includes acid mist conveying pipes connected to each acid mist generating system and an exhaust fan for driving the flow of acid mist. It also includes an electrostatic collection system 1 for directly separating and recovering acid mist particles and rare and precious metals in the flowing acid mist. The inlet of the electrostatic collection system 1 is sealed to the outlet of the acid mist conveying pipe, and the outlet of the electrostatic collection system 1 is connected to the inlet of the exhaust fan.

[0032] It should be noted that this electrostatic collection system 1 can directly use commercially available wet electrostatic precipitators.

[0033] As a preferred embodiment of this example, Figure 2 As shown, the electrostatic collection system 1 includes a housing 101 with an air inlet and an air outlet. A cathode plate 105 and an anode plate 104 are vertically arranged opposite each other in the inner cavity of the housing 101. A receiving box 102 is arranged directly below the anode plate 104, and a drain pipe 103 is installed at the lower end of the receiving box 102. A slag receiving box 106 is detachably installed on the receiving box 102, and a corrosion-resistant filter element is installed in the inner cavity of the slag receiving box 106 for separating rare and precious metals from sulfuric acid liquid.

[0034] This electrostatic collection system 1 creates an electric field between the cathode plate 105 and the anode plate 104, causing acid mist particles and rare and precious metal particles in the acid mist to become charged and accumulate on the vertically set anode plate 104. The acid mist particles converge into droplets and drip downwards, carrying away the rare and precious metal particles. The dripping droplets (i.e., acidic liquid) enter the slag collection box 106, where the rare and precious metal particles are separated from the liquid by a filter. The liquid is finally discharged into the storage pipe through the drain pipe 103, while the rare and precious metal particles are trapped on the filter. This effectively separates the rare and precious metal particles and sulfuric acid from the acid mist, enabling resource recovery and reuse. This electrostatic collection system recovers rare and precious metals and sulfuric acid while avoiding wastewater generation and further reducing the concentration of acid mist emissions (in actual experiments, the concentration of acid mist discharged after purification is less than 15 mg / m3, while the concentration of acid mist discharged after purification using an acid mist absorption tower with alkaline solution absorption is 30 mg / m3), meeting the special emission limit requirements of the copper smelting industry.

[0035] It should be noted that: one, the filter is acid-resistant filter cloth, the number of which can be selected according to the size of the rare metal particles; two, for the rare metal particles remaining on the anode plate 104, manual scraping can be used, or a scraping structure can be provided inside the shell to automatically scrape; three, since the acid mist enters the shell 101 from the acid mist conveying pipeline, the internal space of the shell is larger than that of the acid mist conveying pipeline, which will slow down the flow of the acid mist in the shell 101, thereby prolonging the processing time of the electrostatic collection system 1, and facilitating the separation and collection of sulfuric acid and rare metal particles.

[0036] As a preferred embodiment in this embodiment, as shown in Figure 2 and Figure 3 It also includes a atomizing system 2 for breaking up larger droplets in the flowing acid mist. By breaking up the large droplets in the acid mist through the atomizing system 2, the large droplets are dispersed into small droplets, which can increase the surface area of the droplets, increase the acting area of the electrostatic force, and also can reduce the mass of the droplets, reduce the influence of gravity on the droplets, thereby facilitating the droplets to gather on the anode plate 104 more quickly.

[0037] As a preferred embodiment in this embodiment, as shown in Figure 2 and Figure 3 The atomizing system 2 includes a mounting pipe 21 connected between the air inlet end and the air outlet end of the air blower, a plurality of conical acceleration pipes 22 with conical cavities inside are densely arranged on the air outlet end of the mounting pipe 21, the narrow air outlet ends of the plurality of conical acceleration pipes 22 are respectively connected to corresponding air whistles 24 through connecting pipes 23, the plurality of air whistles 24 are arranged in N rows, and N air whistles are arranged in each row. The plurality of air whistles 24 are arranged in a soundproof box 26 made of soundproof material, the soundproof box 26 is installed at the bottom of the shell 101, and the soundproof box 26 is provided with an exhaust pipe 27, the shell 101 is made of soundproof material, the part opposite to the soundproof box 26 at the bottom of the shell 101 is provided with an opening communicating with the inner cavity of the shell 101, and a sealing plate 25 is sealingly installed in the opening. The soundproof box 26 is arranged close to the air inlet end of the shell 101, and the air whistles 24 are horizontally spaced apart from the anode plate 104 by a distance L.

[0038] The treated gas is accelerated by the conical acceleration pipes 22 and discharged into the connecting pipes 23 through the original air blower, the flowing gas drives the air whistles 24 to emit ultrasonic waves, the ultrasonic waves emitted by the air whistles 24 break up the larger droplets in the acid mist (which mainly relies on the energy in the ultrasonic waves to break up the droplets), and the acid mist with the broken-up larger droplets flows to the electric field region between the anode plate 104 and the cathode plate 105 under the guidance of the air blower, the smaller droplets are accelerated to gather on the anode plate 104, promoting the recovery of the acid liquid and increasing the amount of acid liquid recovered. At the same time, the power of the air whistles 24 is provided by the original process air blower, without additional consumption of electric energy and addition of power source equipment, effectively saving electricity and reducing production cost.

[0039] It should be noted that: first, the large droplets in the flowing acid mist are generally located in the lower part of the flowing gas, so the whistle 24 is arranged below, close to the large droplets, which is beneficial to disperse the large droplets concentrated below; second, by adjusting the flow rate of the acid mist in the shell 101 or adjusting the size of the electric field between the anode plate 104 and the cathode plate 105 by the air extractor, the effect of the electric field on the droplets is avoided to affect the accumulation effect of the droplets on the anode plate 104; third, although the shell 101 and the soundproof box 26 are both soundproof materials, they can consume part of the energy in the ultrasonic wave, but there is still a lot of energy in the ultrasonic wave transmitted to the anode plate 104, which is easy to disperse the large droplets condensed and falling on the anode plate 104, which is not conducive to the collection of acid liquid, so the whistle 24 needs to be horizontally spaced from the anode plate 104 by a distance L. The farther the distance is, the smaller the energy in the ultrasonic wave is, until it is not enough to disperse the large droplets condensed and falling on the anode plate 104.

[0040] As a preferred embodiment in the present embodiment, as shown in Figure 2 、 Figure 4 and Figure 5 , it further comprises a blocking piece 4 for reducing the length L, the blocking piece 4 comprises N energy-consuming filter screens 42 installed in the inner cavity of the shell 101 in a row, and the N energy-consuming filter screens 42 are located between the soundproof box 26 and the anode plate 104, and the resonance frequency of the energy-consuming filter screen 42 is inconsistent with the frequency of the ultrasonic wave emitted by the whistle 24 when it is working.

[0041] In order to ensure that the droplets condensed and falling on the anode plate 104 are not dispersed by the ultrasonic wave, the distance L needs to be a long distance, which is easy to make the whole device occupy a large space, so the blocking piece 4 is arranged, the N energy-consuming filter screens 42 are used to block the ultrasonic wave and consume the energy in the ultrasonic wave, so that there is not enough energy in the sound wave transmitted to the anode plate 104 to disperse the large droplets on the anode plate 104, and the resonance frequency of the energy-consuming filter screen 42 is inconsistent with the frequency of the ultrasonic wave emitted by the whistle 24 when it is working. It is to prevent the energy-consuming filter screen 42 from resonating (resonance will make the energy transmission of the ultrasonic wave more effective, and thus the efficiency of the energy-consuming filter screen 42 is reduced).

[0042] It should be noted that the acid mist can flow through the gap between the energy-consuming filter screens 42.

[0043] As a preferred embodiment in the present embodiment, as shown in Figure 4As shown, the device also includes N resonance filter screens 41, the number of energy-consuming filter screens 42 is greater than the number of resonance filter screens 41, the resonance frequency of the resonance filter screens 41 is consistent with the ultrasonic frequency emitted by the air whistle 24 when it is working, the resonance filter screens 41 are located between the soundproof box 26 and the anode plate 104, and the resonance filter screens 41 and the energy-consuming filter screens 42 are fixedly connected through the connecting rods 43. The N resonance filter screens 41 are all arranged close to the air whistle 24.

[0044] Since the energy-consuming filter screens 42 will have droplets attached thereto after being used for a period of time, although the ultrasonic waves generated by the air whistle 24 can cause the energy-consuming filter screens 42 to vibrate slightly (and the energy contained in the ultrasonic waves becomes less and less as the air whistle 24 and the energy-consuming filter screens 42 become farther and farther apart, and the droplets on the energy-consuming filter screens 42 far from the air whistle 24 are less likely to be dispersed), the slight vibration may not be able to shake off and disperse the droplets on the energy-consuming filter screens 42. Therefore, the resonance filter screens 41 are arranged to assist in the process. When the air whistle 24 emits ultrasonic waves, the resonance filter screens 41 will resonate, and the resonance generated by the resonance filter screens 41 will drive the N energy-consuming filter screens 42 to vibrate, thereby assisting in improving the vibration effect of the energy-consuming filter screens 42, so as to shake off and disperse the droplets attached to the energy-consuming filter screens 42 and the resonance filter screens 41.

[0045] It should be noted that the number of energy-consuming filter screens 42 is generally 3 to 5 times the number of resonance filter screens 41, so that the ultrasonic waves generated by the resonance of the resonance filter screens 41 (which have a lower frequency than the ultrasonic waves generated by the air whistle 24) can be consumed by the energy-consuming filter screens 42 to disperse the droplets condensed on the anode plate 104.

[0046] As a preferred embodiment in this embodiment, as shown in Figure 4 As shown, the upper and lower ends of the resonance filter screens 41 and the energy-consuming filter screens 42 are provided with sliding blocks 45, the sliding blocks 45 are slidingly arranged in the sliding grooves provided on the inner wall of the shell 101, the end surface of the sliding block 45 in contact with the sliding groove is provided with a ball 44, and the sliding block 45 of the outermost energy-consuming filter screen 42 is fixedly connected with the inner wall of the sliding groove through a spring 46. In order to ensure that the resonance filter screens 41 and the energy-consuming filter screens 42 can vibrate well as a whole so as to shake off and disperse the droplets thereon, the sliding block 45, the ball 44 and the spring 46 are arranged, and the purpose is to reduce the friction between the resonance filter screens 41, the energy-consuming filter screens 42 and the shell 101, which is conducive to improving the overall vibration effect of the resonance filter screens 41 and the energy-consuming filter screens 42.

[0047] It should be noted that the spring 46 is used to limit the position of the resonance filter screens 41 and the energy-consuming filter screens 42 and to assist in resetting through the rebounding force of the spring 46.

[0048] As a preferred embodiment in this embodiment, as shown inFigure 1 and Figure 2 As shown, the housing 101 includes a left half and a right half, which are sealed together by a flexible sound insulation component 3. The two ends of the exhaust fan are flexibly connected to the installation pipe 21 and the housing 101 by flexible telescopic pipes, respectively. The flexible sound insulation component 3 can buffer vibration, which can prevent the left half from vibrating strongly when the right half vibrates strongly due to ultrasonic action. If the left half vibrates strongly, it will cause the anode plate 104 in the left half to vibrate strongly, which will easily disperse the liquid droplets condensed on the anode plate 104, which is not conducive to the collection of sulfuric acid.

[0049] It should be noted that: First, the resonant filter 41 and the energy-dissipating filter 42 are located in the inner cavity of the right half. The vibration of the right half of the housing 101 will assist in driving the resonant filter 41 and the energy-dissipating filter 42 to vibrate, which is conducive to the shaking and dispersing of the droplets attached to the filter screen; Second, the flexible sound insulation component 3 can be a flexible sound insulation strip.

[0050] As a preferred embodiment of this example, Figure 2 As shown, the sealing plate 25 is a thin plate (the thinner it is, the worse its sound wave blocking efficiency), and the sealing plate 25 is made of a material with low sound wave blocking effect to avoid excessive energy loss in the ultrasonic waves, so that it has enough energy to disperse large droplets in the acid mist. The working frequency of the sealing plate 25 is not the same as the ultrasonic wave frequency emitted by the air whistle 24 when it is working, to avoid the sealing plate 25 from resonating and being damaged.

[0051] It should be noted that the sealing plate 25 can be made of lightweight wood. Although wood is a solid material, lighter wood is relatively less effective at blocking sound waves. Sound waves can pass through the tiny pores or gaps between fibers of the wood, causing sound waves to propagate.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A leaching waste gas treatment system for the recyclable use of sulfuric acid and rare and precious metals, comprising acid mist conveying pipes connected to various acid mist generating systems and an exhaust fan for driving the flow of acid mist, characterized in that: It also includes an electrostatic collection system (1) for directly separating and recovering acid mist particles and rare and precious metals in flowing acid mist; The air inlet of the electrostatic collection system (1) is sealed to the air outlet of the acid mist conveying pipeline, and the air outlet of the electrostatic collection system (1) is connected to the air inlet of the exhaust fan. The electrostatic collection system (1) includes a housing (101) with an air inlet and an air outlet. The inner cavity of the housing (101) is vertically and oppositely provided with a cathode plate (105) and an anode plate (104). A receiving box (102) is provided directly below the anode plate (104), and a drain pipe (103) is installed at the lower end of the receiving box (102). A slag receiving box (106) is detachably installed on the receiving box (102), and a corrosion-resistant filter element is installed in the inner cavity of the slag receiving box (106) for separating rare and precious metals from sulfuric acid liquid. It also includes an atomization system (2) for breaking up larger droplets in flowing acid mist; The atomizing system (2) includes an installation pipe (21) with an air inlet end connected to the air outlet end of the exhaust fan. The air outlet end of the installation pipe (21) is densely covered with several conical acceleration pipes (22) each having an internal conical cavity. The narrow air outlet ends of each conical acceleration pipe (22) are connected to corresponding air whistles (24) via connecting pipes (23). The air whistles (24) are arranged in N rows, with N whistles in each row. All air whistles (24) are housed in a soundproof box (26) made of soundproofing material. (26) Installed at the bottom of the housing (101), and an exhaust pipe (27) is provided on the soundproof box (26). The housing (101) is made of soundproof material. The bottom of the housing (101) is provided with an opening that communicates with the inner cavity of the housing (101) at the part opposite to the soundproof box (26). A sealing plate (25) is installed in the opening. The soundproof box (26) is located near the air inlet end of the housing (101). The air whistle (24) and the anode plate (104) are laterally spaced by a distance L. It also includes a blocking element (4) for reducing the length L, the blocking element (4) comprising N energy-consuming filters (42) arranged in a row inside the housing (101), and all N energy-consuming filters (42) are located between the soundproof box (26) and the anode plate (104), the resonant frequency of the energy-consuming filters (42) being inconsistent with the ultrasonic frequency emitted by the air whistle (24) when it is working; It also includes N resonant filters (41), the number of energy-consuming filters (42) is greater than the number of resonant filters (41), the resonant frequency of the resonant filters (41) is consistent with the ultrasonic frequency emitted by the air whistle (24) when it is working, the resonant filters (41) are located between the soundproof box (26) and the anode plate (104), the resonant filters (41) and the energy-consuming filters (42) are fixedly connected by connecting rods (43), and the N resonant filters (41) are all set close to the air whistle (24).

2. The leaching waste gas treatment system for recyclable sulfuric acid and rare and precious metals according to claim 1, characterized in that: Both the upper and lower ends of the resonant filter (41) and the energy-consuming filter (42) are provided with sliders (45). The sliders (45) are slidably disposed in the grooves provided on the inner wall of the housing (101). The end face of the slider (45) that contacts the groove is provided with balls (44). The slider (45) of the outermost energy-consuming filter (42) is fixedly connected to the inner wall of the groove by a spring (46).

3. The leaching waste gas treatment system for recyclable sulfuric acid and rare and precious metals according to claim 1, characterized in that: The housing (101) includes a left half and a right half, which are sealed together by a flexible sound insulation component (3). The two ends of the exhaust fan are flexibly connected to the mounting pipe (21) and the housing (101) by flexible telescopic pipes respectively.

4. The leaching waste gas treatment system for recyclable sulfuric acid and rare and precious metals according to claim 1, characterized in that: The sealing plate (25) is a thin plate and is made of a material with low sound wave blocking effect. The operating frequency of the sealing plate (25) is inconsistent with the ultrasonic frequency emitted by the air whistle (24) when it is working.

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