Device and method for collecting metal steam based on fused salt medium

Abstract

The invention discloses a device and method for collecting metal steam based on a fused salt medium, and belongs to the technical field of non-ferrous metal recovery. The device comprises a molten salt pond, a molten salt storage tank, a temperature control system, a one-way valve, a zinc discharge port and the like. The molten salt storage tank is connected with the molten salt pond through a one-way valve, the temperature control system maintains the temperature of molten salt at 400-500 DEG C, the bottom of the molten salt pond is provided with an inverted-taper zinc discharge port and pre-embedded with a heating wire, the top of the molten salt pond is provided with an exhaust pipeline, and the gas pipeline is provided with a nozzle. During working, molten salt enters the molten salt pond, zinc steam and CO enter the molten salt pond from the nozzle, the zinc steam is liquefied and deposited in the molten salt, the CO is discharged, and zinc liquid is discharged from the zinc discharge port regularly. According to the method, zinc steam is condensed through molten salt heat preservation, oxidation is avoided, zinc with the purity exceeding 98% is obtained, the molten salt temperature is uniform and stable, the device is simple in structure, low in energy consumption and low in maintenance cost, nitrate molten salt is low in price and durable, zinc in zinc-containing dust can be efficiently recycled, the recycling rate and purity are improved, and the method is suitable for recycling zinc in steel and non-ferrous metal smelting.

Description

Technical Field

[0001] This invention belongs to the field of non-ferrous metal recycling technology, and specifically relates to a device and method for collecting metal vapor based on molten salt medium, which is particularly suitable for the efficient recovery of zinc from zinc-containing dust generated in processes such as iron and steel smelting and non-ferrous metal smelting. Background Technology

[0002] Zinc-containing dust, a major solid waste generated during steel smelting, contains a large amount of valuable metals such as zinc and iron. Current traditional methods for treating this type of waste have significant drawbacks: direct dumping or landfilling not only wastes precious metal resources but also causes serious environmental pollution. Given the increasing scarcity of zinc ore resources in my country, how to efficiently recover and utilize the valuable metals from zinc-containing dust has become an urgent technical challenge.

[0003] Existing zinc recovery technologies are mainly divided into two categories: hydrometallurgy and pyrometallurgy. Hydrometallurgical processes have inherent drawbacks such as lengthy processes, high energy consumption, and severe environmental pollution. In contrast, vacuum carbothermal reduction technology in pyrometallurgy is gradually becoming a research focus due to its lower energy consumption, higher recovery rate, and environmental friendliness. This technology utilizes the high vapor pressure of zinc to convert zinc oxide into metallic zinc vapor through a carbothermal reduction reaction under vacuum conditions, and then recovers the zinc through condensation.

[0004] However, existing zinc vapor condensation equipment still has many shortcomings. Traditional splash condensers are not only bulky and complex in structure, but their condensation efficiency is also relatively limited, making it difficult to exceed the 96% upper limit for zinc recovery. Although multi-stage condensation technology reduces pipeline condensation losses to some extent, it significantly increases equipment complexity and operating energy consumption. These technical deficiencies severely restrict the economic viability and feasibility of zinc-containing dust resource utilization. Summary of the Invention

[0005] To overcome the shortcomings or defects in the prior art, the purpose of this invention is to provide an apparatus and method for collecting metal vapor based on molten salt medium, which improves the zinc vapor condensation method, increases the zinc recovery rate and purity, and reduces energy consumption and equipment complexity.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a device for collecting metal vapor based on molten salt medium, including a molten salt pool, which is connected to a molten salt storage tank to form a circulation loop, a circulation pump is provided between the molten salt pool and the molten salt storage tank, a zinc discharge port is provided at the bottom of the molten salt pool, and the molten salt pool is connected to a zinc liquid collection pool through the zinc discharge port; the top of the molten salt pool is connected to a gas pipeline, an exhaust pipe is provided at the top of the molten salt pool, and several nozzles are provided at the end of the gas pipeline (10) located in the molten salt pool; it also includes a temperature control system connected to the molten salt storage tank for heat preservation and heating of the molten salt storage tank.

[0007] Furthermore, the molten salt pool has a double-layer structure, with the inner layer being salt-corrosion-resistant stainless steel and the outer layer being an insulation layer made of ceramic fiber.

[0008] Furthermore, the molten salt pool and the molten salt storage tank are connected by pipes, which are made of carbon steel pipes lined with polytetrafluoroethylene or chlorinated polyvinyl chloride pipes. The molten salt pool is equipped with an outlet and an inlet, with the outlet positioned higher than the inlet.

[0009] Furthermore, a heating wire is installed in the zinc discharge port, and the heating wire is connected to the temperature control system.

[0010] Furthermore, the zinc outlet is an inverted cone-shaped pipe.

[0011] Furthermore, the nozzle distribution density on the sides and bottom of the gas pipeline is 0.16-0.25m. 2 / indivual.

[0012] This invention provides a method for collecting metal vapor based on a molten salt medium, comprising: When using the above-mentioned device for collecting metal vapor based on molten salt medium, the temperature control system is activated to heat the molten salt in the molten salt storage tank to a molten state during operation. Molten salt is pumped into the molten salt pool through a circulating pump. Once the molten salt level is above the nozzle at the end of the gas pipe, zinc vapor and CO are fed into the molten salt through the nozzle at the end of the gas pipe. The zinc vapor liquefies into liquid zinc and deposits at the bottom of the molten salt pool. After the liquid zinc has settled, the zinc outlet is opened to allow the liquid zinc to flow out and enter the liquid zinc collection pool. CO is discharged through the molten salt pool exhaust pipe.

[0013] Furthermore, the molten salt includes one or more of zinc chloride, potassium chloride, and sodium chloride.

[0014] Furthermore, the temperature of the molten salt is controlled at 400~500℃.

[0015] Furthermore, the temperature of the zinc discharge port (5) is maintained at 520~550℃ by the nickel-chromium alloy heating wire of the zinc discharge port (5).

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention relates to a zinc vapor collection system built around molten salt as the core medium. Through a circulation loop formed by the molten salt pool and storage tank, coupled with a temperature control system, the system continuously maintains the molten salt in a molten flow state, preventing production interruptions due to insufficient fluidity of the molten salt medium and ensuring continuous system operation. The multi-nozzle design at the end of the gas pipeline evenly disperses zinc vapor into the molten salt, significantly increasing the gas-liquid contact area and providing crucial support for efficient zinc vapor condensation. The overall structure of this invention is simple, requiring no complex auxiliary components. This not only significantly reduces the floor space required and saves space, but also lowers the difficulty of operation and maintenance costs. Routine checks of key components are sufficient, reducing the company's manpower and financial investment.

[0017] This invention involves directly introducing zinc vapor into molten salt for condensation, completely isolating the zinc vapor from air throughout the process. This fundamentally avoids oxidation reactions, ultimately yielding high-quality metallic zinc with a purity exceeding 98%, thus enhancing the product's market competitiveness. The excellent heat retention properties of the molten salt effectively reduce system heat loss, lowering the energy consumption required to maintain the temperature and saving energy costs for the enterprise. Furthermore, this method eliminates the need for complex multi-stage condensation and liquid metal circulation systems, simplifying the production process while reducing equipment investment and failure risks. The stable temperature environment of the molten salt ensures efficient condensation, shortening the production cycle and significantly improving overall production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the device for collecting metal vapor based on molten salt medium according to the present invention.

[0020] The markings in the diagram are as follows: 1. Molten salt pool; 2. Molten salt storage tank; 3. Temperature control system; 4. Circulation pump; 5. Zinc discharge port; 6. Exhaust pipe; 7. Nozzle; 8. Zinc liquid collection pool; 9. Zinc liquid; 10. Gas pipe; 11. Check valve. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this disclosure, it should be noted that the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the disclosed product is in use. These are merely for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0027] In existing technologies, the vacuum carbothermal reduction method for treating zinc-containing dust commonly employs splash condensers or multi-stage condensation devices. Traditional condensers suffer from large size and complex structure, resulting in large equipment footprints and high maintenance costs. While multi-stage condensation technology can reduce pipeline condensation losses, it increases system complexity and energy consumption. These methods face technical bottlenecks in practical applications, such as limited zinc recovery efficiency and high operating costs, making it difficult to meet the demands of industrial production for high efficiency and energy saving.

[0028] Traditional condensers rely on natural gas diffusion and contact with the cooling surface, resulting in insufficient contact area. To address this issue, analysis of the thermal conductivity characteristics of molten salt media revealed that molten salt systems possess high specific heat capacity and fluidity, enabling rapid gas dispersion and uniform heat transfer. Therefore, a device for collecting metal vapor based on molten salt media was constructed. This device leverages the flow characteristics of molten salt to enhance the gas-liquid mass transfer process while simplifying the multi-stage structure of traditional condensation devices.

[0029] The present invention will be further described below with reference to the accompanying drawings: This invention provides a device for collecting metal vapor based on molten salt medium, characterized in that it includes a molten salt pool 1, which is connected to a molten salt storage tank 2 to form a circulation loop, a circulation pump 4 is installed between the molten salt pool 1 and the molten salt storage tank 2, a zinc discharge port 5 is installed at the bottom of the molten salt pool 1, and the molten salt pool 1 is connected to a zinc liquid collection pool 8 through the zinc discharge port 5; the top of the molten salt pool 1 is connected to a gas pipe 10, an exhaust pipe 6 is installed at the top of the molten salt pool 1, and several nozzles 7 are installed at the end of the gas pipe 10 located in the molten salt pool 1; it also includes a temperature control system 3 connected to the molten salt storage tank 2 for heat preservation and heating of the molten salt storage tank 2.

[0030] In some embodiments, the molten salt pool 1 has a double-layer structure. The inner layer of the molten salt pool 1 is used to contain molten salt and capture zinc vapor through the molten salt, while the outer layer is an insulation layer for heat insulation. The inner layer can be formed by welding metal materials; the insulation layer is made of ceramic fiber; and the ceramic fiber is wrapped with waterproof aluminum foil to prevent moisture absorption. The ceramic fiber blanket attached to the outer surface of the inner layer can block the heat conduction path and reduce heat loss. This invention effectively improves the insulation efficiency of the molten salt pool, controls the molten salt temperature fluctuation range within the process requirements, and ensures the continuous and stable operation of the zinc vapor capture process.

[0031] In some embodiments, the molten salt pool 1 and the molten salt storage tank 2 are connected by pipes, which are made of carbon steel pipes lined with PTFE or chlorinated polyvinyl chloride pipes. These pipes are made of corrosion-resistant materials, ensuring the continuity of the molten salt circulation and guaranteeing normal system operation. A circulation pump 4 is installed on the pipe connecting the inlet of the molten salt pool 1 and the molten salt storage tank 2, and a one-way valve 11 is installed on the pipe connecting the outlet of the molten salt pool 1 and the molten salt storage tank 2. The one-way valve 11 allows the molten salt to flow from the molten salt pool 1 to the molten salt storage tank 2, preventing backflow and temperature fluctuations. Specifically, a spring-loaded or gravity-operated one-way valve can be used.

[0032] In some embodiments, the molten salt pool 1 is provided with an outlet and an inlet, with the outlet positioned higher than the inlet. During operation, molten salt from the molten salt storage tank 2 is injected into the pool through the bottom inlet, which is close to the bottom. When the molten salt level reaches the working height, the upper layer of molten salt flows back to the molten salt storage tank 2 through the upper outlet pipe, forming a circulation path. This low-inlet, high-outlet arrangement improves overall temperature uniformity through heat exchange.

[0033] In some embodiments, a heating wire is provided in the zinc discharge port 5, and the heating wire is connected to a temperature control system. The heating wire is a nickel-chromium alloy, which can ensure that the zinc is in a liquid state. Active heating prevents the zinc liquid from solidifying and blocking the channel during the discharge process, so that the zinc liquid can be discharged smoothly through the zinc discharge port 5.

[0034] In some embodiments, the zinc discharge port 5 is an inverted cone-shaped pipe. When the zinc liquid has settled to a certain level at the bottom of the molten salt pool 1, the zinc discharge port 5 is opened. The inverted cone-shaped pipe forms a stable guiding effect on the zinc liquid, effectively avoiding unstable phenomena such as turbulence and splashing during the flow of zinc liquid, ensuring that the zinc liquid always maintains a uniform and orderly flow state, and also reducing the amount of zinc liquid residue in the pipe, thereby improving the zinc liquid collection efficiency.

[0035] The inverted cone-shaped zinc outlet guides the molten zinc to form a stable flow state through its structure; the molten zinc flows downward along the inverted cone-shaped pipe under the action of gravity.

[0036] In some embodiments, the distribution density of nozzles 7 on the sides of the gas pipe 10 and on the ground is 0.16-0.25m. 2 / each. This ensures the mixed gas is evenly dispersed in the molten salt, enhancing gas-liquid contact efficiency and improving the liquefaction efficiency of zinc vapor.

[0037] This invention provides a method for collecting metal vapor based on a molten salt medium, comprising: When using the above-mentioned device for collecting metal vapor based on molten salt medium, the temperature control system 3 is activated to heat the molten salt in the molten salt storage tank 2 to a molten state during operation; Molten salt is fed into molten salt pool 1 via circulating pump 4. After the molten salt level is higher than the nozzle 7 at the end of the gas pipe, zinc vapor and CO are fed into the molten salt through the nozzle 7 at the end of the gas pipe. The zinc vapor liquefies into zinc liquid and deposits at the bottom of molten salt pool 1. After the zinc liquid is deposited, it will sink to the bottom because the zinc liquid is denser than the molten salt. There is a stratification between the zinc liquid and the molten salt. After a period of time, the zinc liquid settles to a certain amount. The zinc outlet 5 is opened and the zinc liquid enters the zinc liquid collection pool 8. Solid zinc is obtained by cooling in the zinc liquid collection pool 8. CO is discharged through the exhaust pipe 6 of molten salt pool 1.

[0038] Molten salt in the storage tank is kept liquid under the action of a temperature control system. A circulating pump 4 delivers the molten salt into the molten salt pool 1. When zinc vapor and CO mixed gas are injected into the molten salt pool through nozzles at the bottom of the gas pipeline, the high heat capacity of the molten salt causes the zinc vapor to liquefy and settle rapidly. Liquid zinc accumulates at the bottom of the pool and flows into a collection pool through the zinc outlet, while CO gas rises to the surface of the molten salt due to density differences and is discharged directionally through the top exhaust pipe 6. This process achieves continuous collection through dynamic circulation of the molten salt, avoiding the efficiency losses caused by the intermittent operation of traditional condensers.

[0039] This invention achieves efficient capture and continuous recovery of zinc vapor, with a stable zinc recovery rate exceeding 98%. The thermal buffering effect of the molten salt medium effectively avoids the impact of temperature fluctuations on the condensation process, and the nozzle dispersion structure significantly increases the gas-liquid contact area. The system reduces operating costs through molten salt recycling, simplifies equipment structure, and improves operational stability, providing a reliable solution for the resource-based treatment of zinc-containing dust.

[0040] In some embodiments, the molten salt is a chloride molten salt, preferably one or a mixture of zinc chloride, potassium chloride, and sodium chloride; the temperature of the molten salt is controlled at 400~500℃. During the vacuum carbothermic reduction process, when zinc vapor enters the molten salt pool 1 through the gas pipeline, the chloride molten salt system remains liquid at high temperature and forms a continuous phase. The chloride ion activity of the molten salt can inhibit the oxidation reaction and avoid the loss of zinc vapor due to re-oxidation. This invention can effectively improve the dissolution rate and liquefaction efficiency of zinc vapor in molten salt, and avoid the interruption of collection caused by premature solidification or decomposition of molten salt. The chemical stability of the molten salt system reduces the frequency of medium replenishment, and the adjustability of the mixing ratio allows the device to adapt to different zinc vapor concentrations and flow rates. When the molten salt temperature is maintained within the set range, the fluidity and heat capacity characteristics of the molten salt allow the zinc vapor to quickly complete the gas-liquid phase change, forming zinc droplets that sink and aggregate. The lower temperature limit setting can prevent the molten salt viscosity from being too high, resulting in uneven gas dispersion, and the upper temperature limit setting can prevent the molten salt from thermally decomposing and producing corrosive gases. The heating power is adjusted in real time by the temperature control module to keep the axial temperature difference in the molten salt pool within a reasonable range.

[0041] In some embodiments, the temperature of the zinc outlet 5 is maintained at 520~550°C by a nickel-chromium alloy heating wire. Heating keeps the molten zinc in a molten state and prevents solidification and retention due to temperature drop.

[0042] In some embodiments, the relevant gas and liquid flow pipelines are wrapped with thermal insulation material, and flanges are used to achieve a sealing effect between pipelines and between pipelines and relevant equipment.

[0043] Example 1 A device for collecting metal vapor based on molten salt medium includes a molten salt pool 1, which is connected to a molten salt storage tank 2 to form a circulation loop. A circulation pump 4 is fixed on the pipeline between the inlet of the molten salt pool 1 and the molten salt storage tank 2, and a one-way valve 11 is fixed on the pipeline between the outlet of the molten salt pool 1 and the molten salt storage tank 2. A zinc discharge port 5 is provided at the bottom of the molten salt pool 1. The inlet of the molten salt pool 1 is 50 mm from the bottom, and the outlet of the molten salt pool 1 is 50 mm from the top. The molten salt pool 1 is connected to a zinc liquid collection pool 8 through the zinc discharge port 5. The top of the molten salt pool 1 is connected to a gas pipeline 10. Two exhaust ports 6 are provided at the top of the molten salt pool 1, and 16 nozzles 7 are provided at the end of the gas pipeline 10 located in the molten salt pool 1. The device also includes a temperature control system 3 connected to the molten salt storage tank 2 for heat preservation and heating of the molten salt storage tank 2.

[0044] The pipes used are made of carbon steel lined with PTFE. A nickel-chromium alloy heating wire is installed in the zinc discharge port 5 and connected to the temperature control system 3. The zinc discharge port 5 is an inverted cone-shaped pipe with an upper inner diameter of Φ50mm and a lower inner diameter of Φ55mm.

[0045] The temperature control system 3 is activated to heat the molten salt in the molten salt storage tank 2 to a temperature of 430-480℃. Zinc vapor and CO are introduced into the molten salt through the nozzle 7 at the end of the gas pipe. The zinc vapor liquefies into liquid zinc and deposits at the bottom of the molten salt pool 1. After the liquid zinc is deposited, the temperature of the zinc discharge port is controlled at 520-550℃. The zinc discharge port 5 is opened to allow the liquid zinc to flow out and enter the liquid zinc collection pool 8. CO is discharged through the exhaust pipe 6 of the molten salt pool 1. After the liquid zinc solidifies in the liquid zinc collection pool 8, a zinc ingot with a metallic luster is obtained, and its zinc content can reach 99.56%.

[0046] The device provided by this invention can maintain the molten salt in a molten state, keeping it within its optimal operating temperature range while minimizing heat loss during transmission. Furthermore, this device completely isolates zinc vapor from air, preventing the reaction of zinc vapor with oxygen during the cooling and liquefaction stage to form zinc oxide impurities. This effectively improves the purity and grade of the final zinc product, meeting the production requirements for high-purity zinc products. In addition, the process flow of this invention is clear, easy to operate, and requires no complex specialized equipment. Process parameters can be flexibly adjusted according to the physicochemical properties of different metal vapors, making it widely applicable to the collection and treatment of various metal vapors such as zinc, lead, and mercury. It provides an efficient and economical solution for the metal smelting and recycling industry and has high potential for widespread application.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still make modifications or equivalent substitutions to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending approval.

Claims

1. An apparatus for collecting metal vapors based on a molten salt medium, characterized in that, The device comprises a molten salt pool (1), the molten salt pool (1) and a molten salt storage tank (2) are connected to form a circulating loop, a circulating pump (4) is arranged between the molten salt pool (1) and the molten salt storage tank (2), a zinc discharge port (5) is arranged at the bottom of the molten salt pool (1), and the molten salt pool (1) is connected with a zinc liquid collecting pool (8) through the zinc discharge port (5); the top of the molten salt pool (1) is connected with a gas pipeline (10), and a gas discharge pipeline (6) is arranged at the top of the molten salt pool (1); a plurality of nozzles (7) are arranged at the end of the gas pipeline (10) in the molten salt pool (1); A temperature control system (3) is connected with the molten salt storage tank (2) and used for heat preservation and heating of the molten salt storage tank (2).

2. A device for collecting metal vapour based on molten salt medium as claimed in claim 1 wherein, The molten salt pool (1) has a double-layer structure, the inner layer is a salt corrosion-resistant stainless steel, and the outer layer is a heat preservation layer made of ceramic fiber.

3. A device for collecting metal vapors based on molten salt medium according to claim 1, characterized in that, The molten salt pool (1) and the molten salt storage tank (2) are connected through a pipeline, and the pipeline is made of a carbon steel pipeline lined with tetrafluoroethylene or a chlorinated polyvinyl chloride pipeline; The molten salt pool (1) is provided with an outlet and an inlet, and the outlet is located higher than the inlet.

4. A device for collecting metal vapors based on molten salt medium according to claim 1, characterized in that, A heating wire is arranged in the zinc discharge port (5), and the heating wire is connected with the temperature control system (3).

5. A device for collecting metal vapors based on molten salt medium according to claim 1, characterized in that, The zinc discharge port (5) is a reverse conical pipeline.

6. The method of claim 1, wherein the molten salt medium comprises a mixture of NaCl, KCl, and NaF. The distribution density of the nozzles (7) on the side and bottom surface of the gas duct (10) is 0.16-0.25 m 2 / each.

7. A method of collecting a metal vapor based on a molten salt medium, characterized in that, The device comprises: The device for collecting metal vapor based on a molten salt medium according to any one of claims 1-6 is used in working, wherein the temperature control system (3) is started to heat the molten salt in the molten salt storage tank (2) to a molten state; The molten salt in the molten state is sent into the molten salt pool (1) through the circulating pump (4), the zinc vapor and CO are sent into the molten salt in the molten state through the nozzles (7) at the end of the gas pipeline after the molten salt liquid level is higher than the nozzles (7), the zinc vapor is liquefied into zinc liquid and deposited at the bottom of the molten salt pool (1), the zinc liquid flows out after the zinc liquid is deposited, enters the zinc liquid collecting pool (8), and the CO is discharged through the gas discharge pipeline (6) of the molten salt pool (1).

8. A device and method for collecting metal vapors based on molten salt medium according to claim 7, characterized in that, The molten salt comprises one or more of a mixture of zinc chloride, potassium chloride and sodium chloride.

9. The method for collecting metal vapor based on molten salt medium according to claim 7, characterized in that, The temperature of the molten salt is controlled to be 400-500 DEG C.

10. The method for collecting metal vapor based on molten salt medium according to claim 7, characterized in that, The temperature of the zinc discharge port is maintained at 520-550 DEG C through the nickel-chromium alloy heating wire of the zinc discharge port (5).

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