A galvanized scrap steel dezincing system

Abstract

The application relates to the technical field of zinc recovery, in particular to a galvanized scrap steel dezincing system. The galvanized scrap steel dezincing system comprises a furnace body, the furnace body is used for containing galvanized scrap steel, a flue gas pipeline is arranged at least partially in the furnace body, the flue gas pipeline is used for circulating electric furnace flue gas, the inside of the furnace body and the inside of the flue gas pipeline are not communicated with each other, a heating device is arranged in the flue gas pipeline and is used for heating the electric furnace flue gas, a gas supply pipeline is communicated with the inside of the furnace body at one end and is used for connecting a protective gas at the other end, a condensing device comprises a condensing chamber, a cooling part, a suction part and a connecting pipeline, the two ends of the connecting pipeline are communicated with the inside of the furnace body and the inside of the condensing chamber respectively, the cooling part is used for cooling the condensing chamber, and the suction part is used for sucking the gas in the condensing chamber; wherein the on-off state of the gas supply pipeline and the on-off state of the connecting pipeline can be adjusted.

Description

Technical Field

[0001] This application relates to the field of zinc recycling technology, and more particularly to a zinc removal system for galvanized scrap steel. Background Technology

[0002] In related technologies, pyrometallurgical or hydrometallurgical methods are commonly used to recover zinc from galvanized scrap steel. However, pyrometallurgical dezincification often consumes a lot of energy, resulting in high zinc recovery costs, while the secondary zinc resources obtained by hydrometallurgical dezincification often contain more by-products, leading to relatively low purity of the recovered zinc. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, embodiments of this application propose a dezincification system for galvanized scrap steel, comprising: The furnace body, which is used to hold galvanized scrap steel; The flue gas duct, at least part of which is located inside the furnace body, is used to circulate the electric furnace flue gas. The interior of the furnace body and the interior of the flue gas duct are not connected. A heating device is installed in the flue gas duct and is used to heat the flue gas from the electric furnace. Gas supply pipeline, one end of which is connected to the inside of the furnace body, and the other end is used to connect to protective gas; The condensation device includes a condensation chamber, a cooling section, a suction section, and connecting pipes. The two ends of the connecting pipes are respectively connected to the interior of the furnace body and the interior of the condensation chamber. The cooling section is used to cool the condensation chamber, and the suction section is used to extract the gas inside the condensation chamber. Both the on / off status of the gas supply pipeline and the on / off status of the connecting pipeline can be adjusted.

[0005] In one feasible implementation, the zinc removal system for galvanized scrap steel further includes: The furnace cover has a feed inlet at the top of the furnace body and is set on the furnace body to open or cover the feed inlet; The feeding device is located above the furnace body, with the discharge end of the feeding device corresponding to the inlet. In this configuration, when the furnace cover covers the feed inlet, the furnace cover and the furnace body are sealed together.

[0006] In one feasible implementation, the zinc removal system for galvanized scrap steel further includes: A baffle is installed inside the furnace. The baffle has a cylindrical structure and a first opening at the top corresponding to the arrangement of the feed inlet. Multiple partitions are provided inside the enclosure component, and the multiple partitions are arranged at intervals to divide the interior of the enclosure component into multiple accommodating spaces, all of which are connected to the first opening; The storage space is used to hold galvanized scrap steel; there are multiple discharge ends, and each discharge end is arranged in a one-to-one correspondence with a storage space.

[0007] In one feasible implementation, the flue gas duct includes: The flue pipe has one end connected to the flue gas inlet of the heating device and the other end connected to the flue gas from the electric furnace. The first exhaust pipe is connected to the exhaust end of the heating device. A first installation space is formed between the inner peripheral wall of the furnace body and the outer peripheral wall of the enclosure. At least a portion of the first exhaust pipe is located within the first installation space. The second exhaust pipe is connected to the exhaust end of the heating device, and a second installation space is formed inside the partition, with at least a portion of the second exhaust pipe located within the second installation space.

[0008] In one possible implementation, the inner peripheral wall of the enclosure member has a raised structure; and / or, the surface of the partition facing the accommodating space has a raised structure.

[0009] In one feasible implementation, the zinc removal system for galvanized scrap steel further includes: The discharge section has a discharge port at the bottom of the furnace body. The discharge section is located in the furnace body and is used to open or cover the discharge port. The bottom of the enclosure has a second opening corresponding to the arrangement of the discharge port. Multiple accommodating spaces are connected to the second opening. In this configuration, the discharge section covers the discharge port, and the discharge section is sealed to the furnace body.

[0010] In one feasible implementation, the cooling section includes: Cooling pipes are installed in the condensation chamber and are used to circulate coolant.

[0011] In one feasible implementation, the condensation device further includes: The cleanroom connects the connecting pipes and the condensation chamber, and is used to contain carbon particles. The heating element is used to heat the cleanroom.

[0012] In one feasible implementation, the zinc removal system for galvanized scrap steel further includes: Temperature measuring device is used to detect the temperature information of electric furnace flue gas in flue gas duct; The control device, with signals connected to the temperature measuring device and the heating device, is used to control the operation of the heating device based on the temperature information of the electric furnace flue gas.

[0013] In one feasible implementation, the gas supply pipe is arranged near the bottom of the furnace body at one end, which connects to the interior of the furnace body; the connecting pipe is arranged near the top of the furnace body at one end, which connects to the interior of the furnace body.

[0014] Compared with the prior art, this application has at least the following beneficial effects: The zinc removal system for galvanized scrap steel provided in this application can cause the zinc layer on the galvanized scrap steel to evaporate by heating it, and then recover the zinc by condensing the zinc vapor. This eliminates the need to use acidic or alkaline solutions to dissolve the zinc layer during the zinc removal process. At least part of the heat required to evaporate the zinc layer of the galvanized scrap steel can be obtained from the waste heat of the electric furnace flue gas, and the mixing of electric furnace flue gas and zinc vapor can be avoided. This helps to reduce energy consumption and cost in the zinc recovery process, and also reduces associated impurities, which helps to improve the purity of the recovered zinc.

[0015] The above description is only an overview of the technical solution provided in this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other features and effects of this application more obvious and easy to understand, the following are specific embodiments of this application. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic structural diagram from a first perspective of an embodiment of a zinc scrap dezincification system provided in this application; Figure 2 A schematic structural diagram from a second perspective of an embodiment of a zinc scrap dezincification system provided in this application; Figure 3 A schematic structural diagram from a third perspective of an embodiment of a zinc scrap dezincification system provided in this application; Figure 4 for Figure 3 A schematic enlarged view of a portion of region A in the middle.

[0017] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 110. Furnace body; 120. Furnace cover; 130. Discharge section; 200. Flue gas duct; 210. Inlet pipe; 220. First exhaust pipe; 230. Second exhaust pipe; 300. Heating device; 400. Gas supply pipe; 500. Condensation device; 510. Condensation chamber; 520. Cooling section; 530. Suction section; 540. Connecting pipe; 550. Purification chamber; 600. Feeding device; 601. Discharge end; 700. Enclosure; 702. Second opening; 703. First installation space; 800. Partition; 801. Second installation space; 802. Protruding structure; 900. Temperature measuring device; 1101. Accommodation space. Detailed Implementation

[0018] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0019] like Figures 1 to 4 As shown in the embodiment of this application, a dezincification system for galvanized scrap steel is proposed, comprising: a furnace body 110 for accommodating galvanized scrap steel; a flue gas duct 200, at least a portion of which is disposed within the furnace body 110 for circulating electric furnace flue gas, wherein the interior of the furnace body 110 and the interior of the flue gas duct 200 are not interconnected; a heating device 300 disposed within the flue gas duct 200 for heating the electric furnace flue gas; and a gas supply duct 400, one end of which is connected to... Inside the furnace body 110, one end is used to connect to the protective gas; the condensing device 500 includes a condensing chamber 510, a cooling section 520, a suction section 530, and a connecting pipe 540. The two ends of the connecting pipe 540 are respectively connected to the inside of the furnace body 110 and the inside of the condensing chamber 510. The cooling section 520 is used to cool the condensing chamber 510, and the suction section 530 is used to suction the gas in the condensing chamber 510. The on / off state of the gas supply pipe 400 and the on / off state of the connecting pipe 540 are both adjustable.

[0020] The zinc removal system for galvanized scrap steel proposed in this application includes the aforementioned furnace body 110, flue gas duct 200, heating device 300, gas supply duct 400, and condensation device 500. The condensation device 500 includes a condensation chamber 510, a cooling section 520, a suction section 530, and a connecting pipe 540. The interior of the furnace body 110 is used to accommodate the galvanized scrap steel to be dezincified, providing a relatively closed and stable environment for the dezincification process. At least a portion of the flue gas duct 200 is located inside the furnace body 110 and is used to circulate electric furnace flue gas. When the electric furnace flue gas flows through the portion of the flue gas duct 200 located inside the furnace body 110, heat can be released into the interior of the furnace body 110 through the flue gas duct 200 to heat the galvanized scrap steel inside the furnace body 110. Therefore, the aforementioned dezincification system can utilize the high-temperature electric furnace flue gas to promote the zinc layer formation on the galvanized scrap steel. The gas is evaporated into zinc vapor for subsequent zinc recovery. The interior of the flue gas duct 200 is not connected to the interior of the furnace body 110, preventing mixing of the electric furnace flue gas and zinc vapor and ensuring the purity of the recovered zinc. The heating device 300 is installed on the flue gas duct 200 and is used to heat the aforementioned electric furnace flue gas. Therefore, in practical applications, if the temperature of the electric furnace flue gas connected to the flue gas duct 200 is too low, the aforementioned zinc removal system can easily use the heating device 300 to supplement the heating of the electric furnace flue gas, ensuring the heating effect of the electric furnace flue gas on the galvanized scrap steel and improving the zinc layer evaporation efficiency. Provides protection; one end of the gas supply pipe 400 is connected to the inside of the furnace body 110, and the other end is used to connect to the protective gas. The condensing chamber 510 and the furnace body 110 are connected to each other through the connecting pipe 540. The suction unit 530 can suck the gas in the condensing chamber 510 during operation to create a negative pressure environment in the condensing chamber 510, thereby driving the gas inside the furnace body 110 to flow to the condensing chamber 510. The cooling unit 520 can cool the condensing chamber 510 to reduce the internal ambient temperature of the condensing chamber 510, thereby preventing the galvanized scrap steel inside the furnace body 110 from being heated. When the zinc vapor production reaches a certain level, the aforementioned dezincification system can use the suction unit 530 to provide power to drive the mixed gas containing the aforementioned protective gas and zinc vapor in the furnace body 110 to flow into the condensation chamber 510 through the connecting pipe 540 for cooling, so that the zinc vapor condenses into solid zinc and separates from the protective gas, thereby realizing the dezincification of galvanized scrap steel and the recovery of zinc materials. In addition, during the flow of the aforementioned mixed gas, the protective gas can be used to protect the zinc vapor, reducing the risk of zinc vapor reaction and helping to ensure the purity of the recovered solid zinc.Both the on / off states of the gas supply pipe 400 and the connecting pipe 540 are adjustable. That is, the gas supply pipe 400 can switch between on and off states, and the connecting pipe 540 can also switch between on and off states. This facilitates the controllability of the aforementioned dezincification system by regulating the access and cessation of protective gas, thus improving its controllability. Furthermore, before heating the galvanized scrap steel using electric furnace flue gas, the dezincification system can expel the initial gas inside the furnace body 110 by pre-cutting off the gas supply pipe 400 and activating the suction unit 530, thereby increasing the vacuum level inside the furnace body 110. Then, the connecting pipe 540 can be further cut off to improve the sealing of the furnace body 110, ensuring a vacuum level inside the furnace body 110. This facilitates vacuum heating of the galvanized scrap steel, improving the efficiency of the heating process, reducing energy consumption, and minimizing the impact of the initial gas on the purity of the recovered zinc, providing a reliable guarantee for the efficiency and quality of zinc recovery.

[0021] In summary, the zinc removal system for galvanized scrap steel provided in this application can promote the evaporation of the zinc layer on the galvanized scrap steel by heating it, and realize zinc recovery by condensing the zinc vapor. It eliminates the need to use acidic or alkaline solutions to dissolve the zinc layer during the zinc removal process. At least part of the heat required to evaporate the zinc layer of the galvanized scrap steel can be obtained from the waste heat of the electric furnace flue gas, and the mixing of electric furnace flue gas and zinc vapor can be avoided. This helps to reduce energy consumption and cost in the zinc recovery process, and also reduces the associated impurities in the zinc recovery process, which helps to improve the purity of the recovered zinc.

[0022] It is understood that the aforementioned furnace body 110 can have a feed inlet and a discharge outlet to allow the galvanized scrap steel to be dezincified to be fed in through the feed inlet and discharged through the discharge outlet; the opening and closing states of the aforementioned feed inlet and discharge outlet are both adjustable. Since the galvanized scrap steel undergoes heating during the dezincification process, the temperature of the dezincified scrap steel is usually relatively high. In practical applications, the dezincified scrap steel can be fed into the smelting process before cooling to room temperature, which further helps to save energy consumption in scrap steel smelting. Furthermore, because the zinc layer has been removed, the dezincified scrap steel has good cleanliness, making it easy to smelt directly. Therefore, the aforementioned dezincification system can provide cleaner smelting raw materials for scrap steel smelting, further reducing scrap steel smelting costs.

[0023] It is understood that the aforementioned flue gas duct 200 can be entirely located inside the furnace body 110 to improve the heat dissipation effect of the flue gas duct 200 on the interior of the furnace body 110. Correspondingly, the inlet end of the flue gas duct 200 can be connected to the aforementioned electric furnace flue gas through other external pipes, and the outlet end of the flue gas duct 200 can also discharge the electric furnace flue gas through other external pipes. Alternatively, the flue gas duct 200 can be installed through the furnace body 110, with both the inlet and outlet ends of the flue gas duct 200 located outside the furnace body 110, so that the flue gas duct 200 can be directly connected to and discharge the electric furnace flue gas to the outside. In this case, at least a portion of the flue gas duct 200 is located inside the furnace body 110 to utilize the electric furnace flue gas to heat the galvanized scrap steel inside the furnace body 110.

[0024] It is understood that the start / stop state of the aforementioned heating device 300 is adjustable, meaning that the heating device 300 can switch between an operating state and a closed state. In practical applications, this allows for easy control of the heating device 300's operation based on the temperature of the electric furnace flue gas connected to the flue gas duct 200, which helps to ensure the heating effect of the electric furnace flue gas on the galvanized scrap steel while saving energy consumption. Accordingly, when the heating device 300 is in the operating state, it can heat the flowing electric furnace flue gas; when the heating device 300 is in the closed state, it can stop heating the flowing electric furnace flue gas. The heating method of the electric furnace flue gas by the heating device 300 can include, but is not limited to, at least one of electric heating, combustion heating, and heat exchange heating. Correspondingly, the heating device 300 can include at least one of an electric heating element, a burner, and a heat exchanger.

[0025] It is understood that there can be multiple gas supply pipes 400, which can be arranged at intervals in the furnace body 110 to allow the furnace body 110 to be supplied with protective gas from multiple directions, thereby improving the mixing degree of zinc vapor and protective gas and enhancing the protective effect on zinc vapor. The aforementioned protective gas can be an inert gas such as argon, or a commonly used protective gas such as nitrogen.

[0026] It is understood that the aforementioned condensation chamber 510 can be a hollow box-shaped structure to accommodate the aforementioned mixed gas and the condensed solid zinc; for example, such as Figure 1 and Figure 2As shown, the upper part of the condensing chamber 510 can be rectangular, and the lower part can be an inverted conical structure with end faces matching the bottom surface of the aforementioned rectangular prism. The internal space of the condensing chamber 510 is similar to its external shape, which helps to improve the uniformity of the wall thickness of the condensing chamber 510, further ensuring the temperature uniformity inside the condensing chamber 510. It also allows the internal space of the condensing chamber 510 to gradually shrink from top to bottom, which is conducive to the accumulation of solid zinc in the bottom area inside the condensing chamber 510, improving the concentration of solid zinc distribution inside the condensing chamber 510. Correspondingly, the bottom end of the condensing chamber 510 can be provided with an openable and closable recovery port to facilitate the collection of solid zinc through the recovery port.

[0027] It is understood that the aforementioned cooling unit 520 can cool and reduce the temperature of the condensing chamber 510 and the gas inside the condensing chamber 510 by cooling the shell wall of the condensing chamber 510 and / or directly absorbing the heat inside the condensing chamber 510. The specific cooling method of the cooling unit 520 for the condensing chamber 510 can be set according to actual needs, and no further restrictions are imposed here.

[0028] It is understood that the aforementioned suction unit 530 may include an exhaust pump, which, for example, may be a vacuum pump.

[0029] It is understood that the outer side of the aforementioned connecting pipe 540 may be covered with a heat insulation layer or a heat insulation layer to reduce the heat loss when the aforementioned mixed gas flows through the connecting pipe 540, which helps to prevent zinc vapor from condensing inside the connecting pipe 540.

[0030] It is understood that, in practical applications, the aforementioned zinc removal system may also include a first shut-off valve and a second shut-off valve. The first shut-off valve is located in the aforementioned gas supply pipeline 400 and is used to control the on / off state of the gas supply pipeline 400, and the second shut-off valve is located in the aforementioned connecting pipeline 540 and is used to control the on / off state of the connecting pipeline 540. The aforementioned first shut-off valve and the aforementioned second shut-off valve can be electric shut-off valves or manual shut-off valves, which can be set according to actual needs, and no further restrictions are imposed here.

[0031] It should be noted that the aforementioned flue gas duct 200 can be used, but is not limited to, for circulating electric furnace flue gas. In practical applications, the aforementioned flue gas duct 200 can also be used for circulating converter flue gas or coke oven gas, which have higher outlet temperatures, to provide heat for heating galvanized scrap steel.

[0032] To facilitate understanding of the use of the zinc removal system for galvanized scrap steel proposed in this application, a zinc removal method based on the aforementioned zinc removal system is provided herein, which includes the following steps: Step S1: After loading the galvanized scrap steel to be degalvanized into the furnace body 110, cut off the gas supply pipe 400 and connect the connecting pipe 540.

[0033] Step S2: Start the aforementioned suction unit 530 until the internal air pressure of the furnace body 110 reaches the preset air pressure, then shut down the aforementioned suction unit 530 and disconnect the connecting pipe 540. The aforementioned preset air pressure is less than or equal to 50 Pa and greater than or equal to 10 Pa, which facilitates subsequent heating of galvanized scrap steel under approximately vacuum conditions.

[0034] Step S3: Electric furnace flue gas is introduced into flue gas duct 200 to heat the galvanized scrap steel inside the furnace body 110. Specifically, when the temperature of the electric furnace flue gas entering the flue gas duct 200 is less than or equal to 1200℃, the heating device 300 is activated; when the temperature of the electric furnace flue gas entering the flue gas duct 200 is greater than or equal to 1300℃, the heating device 300 is deactivated. This ensures that the electric furnace flue gas in the flue gas duct 200 has a high heat content, which is beneficial for ensuring the heating effect on the galvanized scrap steel.

[0035] Step S4: When the galvanized scrap steel in the furnace body 110 is heated for a duration greater than or equal to 1 hour and less than or equal to 2 hours, the gas supply pipe 400 and the connecting pipe 540 are connected, and the suction unit 530 is activated to allow the mixed gas in the furnace body 110 to flow into the condensation chamber 510. Based on this, the zinc vapor generated in the furnace body 110 can be condensed into solid zinc in the condensation chamber 510. After condensation, the collected solid zinc can be removed from the condensation chamber 510, completing the dezincification and zinc recovery operation of the galvanized scrap steel. It is understood that the cooling unit 520 is used to cool the internal ambient temperature of the condensation chamber 510 to below the melting point of zinc, so that the zinc vapor can condense into solid zinc in the condensation chamber 510.

[0036] It should be noted that, according to the test, when using the aforementioned dezincification system to dezincify 5 tons of galvanized scrap steel with a zinc content of about 0.5%, the recovered zinc powder weighed about 24.15 kg, and the recovery rate was about 96.6%.

[0037] like Figures 2 to 4 As shown, in one feasible embodiment, the dezincification system for galvanized scrap steel further includes: a furnace cover 120, with a feed inlet at the top of the furnace body 110, the furnace cover 120 being disposed on the furnace body 110 and used to open or cover the feed inlet; a feeding device 600, disposed above the furnace body 110, with the discharge end 601 of the feeding device 600 corresponding to the feed inlet; wherein, when the furnace cover 120 covers the feed inlet, the furnace cover 120 and the furnace body 110 are sealed together.

[0038] In this technical solution, the degalvanizing system for galvanized scrap steel may further include the aforementioned furnace cover 120 and feeding device 600. Based on the aforementioned configuration, the degalvanizing system can utilize the feeding device 600 to buffer the galvanized scrap steel to be degalvanized. When galvanized scrap steel needs to be loaded into the furnace body 110, the aforementioned furnace cover 120 can be manipulated to open the feed inlet, allowing the galvanized scrap steel in the feeding device 600 to fall into the furnace body 110 under gravity through the aforementioned feed inlet, which improves the loading convenience of the aforementioned degalvanizing system. When the aforementioned furnace cover 120 covers the feed inlet, it can seal with the furnace body 110, thereby ensuring the sealing of the interior of the furnace body 110, preventing heat loss from the furnace, and reducing the risk of impurities from the external environment mixing into the interior of the furnace body 110.

[0039] like Figures 2 to 4 As shown, in one feasible embodiment, the degalvanizing system for galvanized scrap steel further includes: a baffle 700 disposed within the furnace body 110, the baffle 700 having a cylindrical structure and a first opening at the top corresponding to the feed inlet; a plurality of partitions 800 disposed within the baffle 700, the partitions 800 being spaced apart to divide the interior of the baffle 700 into a plurality of accommodating spaces 1101, the plurality of accommodating spaces 1101 being connected to the first opening; wherein, the accommodating spaces 1101 are used to accommodate galvanized scrap steel; and the number of discharge ends 601 is plurality, and the discharge ends 601 are arranged in a one-to-one correspondence with the accommodating spaces 1101.

[0040] In this technical solution, the degalvanizing system for galvanized scrap steel may further include the aforementioned enclosure 700 and multiple partitions 800. Based on the aforementioned configuration, the degalvanizing system can utilize the enclosure 700 and multiple partitions 800 to define multiple aforementioned accommodating spaces 1101 inside the furnace body 110. These multiple accommodating spaces 1101 are all connected to the aforementioned first opening and are arranged in a one-to-one correspondence with the multiple discharge ends 601 of the feeding device 600. Thus, during the process of filling the furnace body 110 with galvanized scrap steel, the feeding device 600 can disperse and fill the multiple accommodating spaces 1101 through the multiple discharge ends 601, which is beneficial for improving the material distribution effect and the stacking state of the galvanized scrap steel inside the furnace body 110, thereby enhancing the heating effect of the galvanized scrap steel inside the furnace body 110.

[0041] It is understood that the first opening faces the aforementioned feed inlet and is located below the aforementioned feed inlet; each of the aforementioned accommodating spaces 1101 is correspondingly arranged below one of the aforementioned discharge ends 601.

[0042] For example, such as Figure 3As shown, the aforementioned furnace body 110 and the aforementioned enclosure 700 are aligned in the same height direction and both have circular cross-sectional outlines. The cross-sectional outline of the internal space of the furnace body 110 can also be circular. The aforementioned cross-section refers to the cross-section perpendicular to the height direction. Multiple partitions 800 can be arranged in parallel and spaced radially along the enclosure 700 to divide the internal space of the enclosure 700 into multiple radially arranged accommodating spaces 1101. Correspondingly, the arrangement direction of the aforementioned multiple discharge ends 601 is consistent with the arrangement direction of the multiple accommodating spaces 1101.

[0043] For example, the enclosure 700 and the partition 800 may be made of a thermally conductive material.

[0044] like Figures 1 to 4 As shown, in one feasible embodiment, the flue gas duct 200 includes: a flue gas inlet pipe 210, one end of which is connected to the flue gas inlet of the heating device 300, and the other end of which is used to access the flue gas from the electric furnace; a first exhaust pipe 220, which is connected to the exhaust gas outlet of the heating device 300, and a first installation space 703 is formed between the inner peripheral wall of the furnace body 110 and the outer peripheral wall of the enclosure member 700, at least a portion of the first exhaust pipe 220 being located within the first installation space 703; and a second exhaust pipe 230, which is connected to the exhaust gas outlet of the heating device 300, and a second installation space 801 is formed within the partition 800, at least a portion of the second exhaust pipe 230 being located within the second installation space 801.

[0045] In this technical solution, the flue gas duct 200 may include the aforementioned inlet pipe 210, first exhaust pipe 220, and second exhaust pipe 230. The flue gas duct 200 can connect to the electric furnace flue gas through the inlet pipe 210, and the heating device 300 distributes the connected electric furnace flue gas to the first exhaust pipe 220 and second exhaust pipe 230. Accordingly, the heating device 300 can heat the flowing electric furnace flue gas during operation to increase the temperature of the electric furnace flue gas connected to the first exhaust pipe 220 and second exhaust pipe 230. At least a portion of the first exhaust pipe 220 is located within the first installation space 703 formed between the inner peripheral wall of the furnace body 110 and the outer peripheral wall of the enclosure member 700. The heat released by the first exhaust pipe 220 can then be applied to multiple accommodating spaces 1101 through the enclosure 700, thereby heating the galvanized scrap steel inside the enclosure 700 as a whole and enhancing the heating of the outer periphery of the galvanized scrap steel pile. At least a portion of the second exhaust pipe 230 is located within the second installation space 801 formed inside the partition 800, so the heat released by the second exhaust pipe 230 can act on the galvanized scrap steel in the adjacent accommodating spaces 1101 of the corresponding partition 800, enhancing the heating of the central part of the galvanized scrap steel pile. Based on this, the heating effect of the aforementioned dezincification system on the galvanized scrap steel can be further enhanced, the heating uniformity of the galvanized scrap steel pile can be improved, and the zinc vapor production efficiency can be increased.

[0046] For example, the first exhaust pipe 220 is spirally wound around the outer peripheral wall of the enclosure 700, and the exhaust end of the first exhaust pipe 220 is located outside the furnace body 110; there are multiple second exhaust pipes 230, at least a portion of each second exhaust pipe 230 is disposed within the second installation space 801 of a partition 800, and the second exhaust pipe 230 extends in a curved shape along the height direction of the corresponding partition 800, with the exhaust end of the second exhaust pipe 230 located outside the furnace body 110. Based on this, the heating effect and heating efficiency of the flue gas pipe 200 on galvanized scrap steel can be enhanced, the heating uniformity of the galvanized scrap steel pile can be further improved, and the zinc vapor production efficiency can be increased.

[0047] For example, the space between the first exhaust pipe 220 and the outer peripheral wall of the enclosure 700 is filled with a thermally conductive material, and the enclosure 700 is made of steel. Based on this, the heating effect of the first exhaust pipe 220 on galvanized scrap steel can be improved, and the heat utilization efficiency of the electric furnace flue gas can be increased.

[0048] For example, the space between the first exhaust pipe 220 and the inner peripheral wall of the furnace body 110 is filled with thermal insulation material, and the furnace wall of the furnace body 110 is made of thermal insulation material or heat insulation material. Based on this, heat loss inside the furnace body 110 can be reduced, and the heat utilization efficiency of the electric furnace flue gas can be improved.

[0049] For example, the second installation space 801 may be filled with a thermally conductive material, and the partition 800 may be made of steel; based on this, the heat transfer efficiency between the second exhaust pipe 230 and the partition 800 may be enhanced, the heating effect of the second exhaust pipe 230 on galvanized scrap steel may be improved, and the heat utilization efficiency of the electric furnace flue gas may be increased.

[0050] like Figure 4 As shown, in one possible embodiment, the inner peripheral wall of the enclosure 700 is formed with a protruding structure 802; and / or, the partition 800 is formed with a protruding structure 802 on the plate surface facing the accommodating space 1101.

[0051] In this technical solution, the inner peripheral wall of the enclosure 700 can be formed with a protruding structure 802. Based on this, the inner surface area of ​​the enclosure 700 can be increased, the radiative heat release efficiency of the enclosure 700 to the internal space can be improved, the heating effect on the galvanized scrap steel can be enhanced, and the contact area between the enclosure 700 and the galvanized scrap steel can be reduced, thereby reducing the risk of the galvanized scrap steel sticking to the enclosure 700.

[0052] In this technical solution, the surface of the partition 800 facing the accommodating space 1101 can be formed with a protruding structure 802. Based on this, the surface area of ​​the partition 800 facing the accommodating space 1101 can be increased, thereby improving the radiative heat release efficiency of the partition 800 to the accommodating space 1101, enhancing the heating effect on the galvanized scrap steel, and also helping to reduce the contact area between the partition 800 and the galvanized scrap steel, thereby reducing the risk of the galvanized scrap steel sticking to the partition 800.

[0053] It is understandable that the enclosure 700 and the partition 800 can simultaneously have the aforementioned protruding structure 802.

[0054] For example, the inner peripheral wall of the enclosure member 700 is formed with a plurality of protrusions 802, and the plurality of protrusions 802 are arranged in an array along the circumferential and height directions of the enclosure member 700.

[0055] For example, the partition 800 has a plurality of protrusions 802 formed on the surface of the partition facing the accommodating space 1101, and the plurality of protrusions 802 are arranged in an array along the width and height directions of the partition 800.

[0056] like Figure 2 and Figure 3 As shown, in one feasible embodiment, the dezincification system for galvanized scrap steel further includes: a discharge section 130, a discharge port is provided at the bottom of the furnace body 110, the discharge section 130 is disposed in the furnace body 110 and is used to open or cover the discharge port, the bottom of the enclosure member 700 forms a second opening 702 corresponding to the arrangement of the discharge port, and a plurality of accommodating spaces 1101 are all connected to the second opening 702; wherein, when the discharge section 130 covers the discharge port, the discharge section 130 is sealed to the furnace body 110.

[0057] In this technical solution, the dezincification system for galvanized scrap steel may further include the aforementioned discharge section 130. Based on the aforementioned configuration, the dezincification system can open the discharge port through the discharge section 130 to discharge the dezincified galvanized scrap steel, which is beneficial to improving the discharge convenience of the aforementioned dezincification system, facilitating the reuse of the aforementioned dezincification system, and allowing the discharge section 130 to cover the aforementioned discharge port after discharge to ensure the sealing of the furnace body 110.

[0058] For example, the enclosure 700 can be a frustum-shaped structure with open ends and a hollow interior. The angle between the inner peripheral wall of the enclosure 700 and its height direction can be, but is not limited to, 5°. Based on this, it is possible to facilitate the discharge of galvanized scrap steel inside the enclosure 700.

[0059] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the cooling unit 520 includes a cooling pipe disposed in the condensation chamber 510, the cooling pipe being used to circulate coolant.

[0060] In this technical solution, the cooling unit 520 may include the aforementioned cooling pipes. Based on the aforementioned configuration, the aforementioned zinc stripping system can cool the condensation chamber 510 by liquid cooling, which is beneficial to improving the gas cooling efficiency in the condensation chamber 510 and increasing the production efficiency of solid zinc.

[0061] It is understood that the aforementioned coolant can be, but is not limited to, water.

[0062] For example, there can be multiple cooling pipes, with at least one cooling pipe spirally wound around the outer wall of the condensing chamber 510 and at least one cooling pipe passing through the internal space of the condensing chamber 510. Based on this, the cooling unit 520 can cool the zinc vapor inside the condensing chamber 510 by cooling the shell wall of the condensing chamber 510 and by directly absorbing the heat inside the condensing chamber 510, thereby improving the cooling efficiency of the zinc vapor.

[0063] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the condensation device 500 further includes: a purification chamber 550 connected between the connecting pipe 540 and the condensation chamber 510, the purification chamber 550 being used to contain carbon particles; and a heating unit for heating the purification chamber 550.

[0064] In this technical solution, the condensation device 500 may further include the aforementioned purification chamber 550 and the aforementioned heat replenishment section. Based on the aforementioned configuration, zinc vapor can pre-contact with carbon particles in the purification chamber 550 before flowing into the condensation chamber 510. Thus, the aforementioned zinc removal system can utilize the carbon particles to adsorb impurities in the zinc vapor, and the aforementioned heat replenishment section can heat the purification chamber 550, preventing zinc vapor from condensing inside the purification chamber 550. This facilitates the concentrated distribution of solid zinc in the condensation chamber 510 and promotes the reduction reaction between zinc oxide flowing through the carbon particles and the carbon particles, thereby improving the zinc recovery rate.

[0065] For example, the heating element is used to heat the cleanroom 550 so that the internal ambient temperature of the cleanroom 550 is greater than or equal to 600°C. Based on this, the condensation of zinc vapor in the cleanroom 550 can be avoided, and the redox reaction between carbon particles and zinc oxide can be facilitated.

[0066] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the zinc stripping system for galvanized scrap steel further includes: a temperature measuring device 900 for detecting the temperature information of the electric furnace flue gas in the flue gas duct 200; and a control device, signal-connected to the temperature measuring device 900 and the heating device 300, for controlling the operation of the heating device 300 according to the temperature information of the electric furnace flue gas.

[0067] In this technical solution, the zinc stripping system for galvanized scrap steel may further include the aforementioned temperature measuring device 900 and control device. Based on the aforementioned configuration, the zinc stripping system can utilize the control device to control the operation of the heating device 300 according to the electric furnace flue gas temperature information in the flue gas duct 200. This facilitates automatic control of the electric furnace flue gas reheating during the zinc recovery process, thereby improving the automation level and ease of operation of the aforementioned zinc stripping system, and helping to save energy consumption of the aforementioned heating device 300, further reducing zinc recovery costs.

[0068] For example, the temperature measuring device 900 is used to detect the temperature information of the electric furnace flue gas in the aforementioned flue gas inlet pipe 210. The control device is configured to control the heating device 300 to start when the temperature of the electric furnace flue gas in the flue gas inlet pipe 210 is less than or equal to 1200°C, and to control the heating device 300 to shut down when the temperature of the electric furnace flue gas in the flue gas inlet pipe 210 is greater than or equal to 1300°C. The aforementioned temperature measuring device 900 may include a temperature sensor. In practical applications, the temperature measuring device 900 can be arranged close to the connection between the flue gas inlet pipe 210 and the heating device 300, so that the aforementioned electric furnace flue gas temperature information can also reflect the flue gas temperature accessed by the heating device 300, which is beneficial to improving the temperature control accuracy of the heating device 300.

[0069] like Figure 1 and Figure 2 As shown, in one feasible embodiment, the gas supply pipe 400 is arranged near the bottom of the furnace body 110 at one end connected to the interior of the furnace body 110; the connecting pipe 540 is arranged near the top of the furnace body 110 at one end connected to the interior of the furnace body 110.

[0070] In this technical solution, the positions of the gas supply pipe 400 and the connecting pipe 540 that connect to the interior of the furnace body 110 are constrained. Based on the aforementioned settings, during the discharge of the mixed gas inside the furnace body 110, a flow field with bottom air intake and top air exhaust can be formed inside the furnace body 110, which can enhance the mixing effect of the protective gas and zinc vapor, and enhance the flow efficiency of the mixed gas, thereby enhancing the zinc recovery efficiency.

[0071] In this application, the terms “first,” “second,” and “third” are used for descriptive purposes only to distinguish one entity or operation from another, and should not be construed as indicating or implying relative importance, nor necessarily requiring or implying any such actual relationship or order between these entities or operations. The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The term “a plurality” refers to two or more unless expressly defined otherwise. The terms “installed,” “connected,” “joined,” “fixed,” etc., should be interpreted broadly; for example, “connected” can be a fixed connection, a detachable connection, or an integral connection; “joined” can be a direct connection or an indirect connection via an intermediate medium. Without further limitations, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or unit 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 application.

[0073] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A zinc removal system for galvanized scrap steel, characterized in that, include: Furnace body (110), the furnace body (110) being used to contain galvanized scrap steel; A flue gas duct (200), at least a portion of which is disposed within the furnace body (110), is used to circulate electric furnace flue gas, and the interior of the furnace body (110) is not connected to the interior of the flue gas duct (200). A heating device (300) is disposed in the flue gas duct (200) and is used to heat the electric furnace flue gas; Gas supply pipe (400), one end of which is connected to the interior of the furnace body (110), and the other end is used to connect to protective gas; The condensing device (500) includes a condensing chamber (510), a cooling section (520), a suction section (530), and a connecting pipe (540). The two ends of the connecting pipe (540) are respectively connected to the interior of the furnace body (110) and the interior of the condensing chamber (510). The cooling section (520) is used to cool the condensing chamber (510), and the suction section (530) is used to suction the gas in the condensing chamber (510). The on / off states of the gas supply pipe (400) and the connecting pipe (540) are both adjustable.

2. The zinc removal system for galvanized scrap steel according to claim 1, characterized in that, Also includes: A furnace cover (120) is provided on the top of the furnace body (110) for opening or covering the feed inlet; A feeding device (600) is disposed above the furnace body (110), and the discharge end (601) of the feeding device (600) is arranged corresponding to the feed inlet; When the furnace cover (120) covers the feed inlet, the furnace cover (120) and the furnace body (110) are in a sealed fit.

3. The zinc removal system for galvanized scrap steel according to claim 2, characterized in that, Also includes: A baffle (700) is disposed inside the furnace body (110). The baffle (700) has a cylindrical structure and a first opening at the top corresponding to the arrangement of the feed inlet. Multiple partitions (800) are disposed within the enclosure (700), and the multiple partitions (800) are spaced apart to divide the interior of the enclosure (700) into multiple accommodating spaces (1101), and the multiple accommodating spaces (1101) are all connected to the first opening; The accommodating space (1101) is used to accommodate the galvanized scrap steel; there are multiple discharge ends (601), and the discharge ends (601) are arranged in a one-to-one correspondence with the accommodating spaces (1101).

4. The zinc removal system for galvanized scrap steel according to claim 3, characterized in that, The flue gas duct (200) includes: A flue gas inlet pipe (210) is provided, one end of which is connected to the flue gas inlet of the heating device (300), and the other end is used to access the flue gas from the electric furnace. The first exhaust pipe (220) is connected to the exhaust end of the heating device (300). A first installation space (703) is formed between the inner peripheral wall of the furnace body (110) and the outer peripheral wall of the enclosure (700). At least a portion of the first exhaust pipe (220) is located within the first installation space (703). The second exhaust pipe (230) is connected to the exhaust end of the heating device (300), and a second installation space (801) is formed in the partition (800), at least a portion of the second exhaust pipe (230) is located in the second installation space (801).

5. The zinc removal system for galvanized scrap steel according to claim 4, characterized in that, The inner peripheral wall of the enclosure (700) is formed with a protruding structure (802); and / or, the surface of the partition (800) facing the accommodating space (1101) is formed with a protruding structure (802).

6. The zinc removal system for galvanized scrap steel according to claim 3, characterized in that, Also includes: The discharge section (130) is provided at the bottom of the furnace body (110) and is used to open or cover the discharge port. The bottom of the enclosure member (700) is formed with a second opening (702) corresponding to the arrangement of the discharge port. The plurality of accommodating spaces (1101) are all connected to the second opening (702). Wherein, when the discharge section (130) covers the discharge port, the discharge section (130) is sealed to the furnace body (110).

7. The zinc removal system for galvanized scrap steel according to any one of claims 1 to 6, characterized in that, The cooling section (520) includes: A cooling pipe is provided in the condensation chamber (510) for circulating coolant.

8. The zinc removal system for galvanized scrap steel according to any one of claims 1 to 6, characterized in that, The condensation device (500) further includes: A cleanroom (550) is connected between the connecting pipe (540) and the condensation chamber (510), and the cleanroom (550) is used to contain carbon particles. A heating element is used to heat the purification chamber (550).

9. The zinc removal system for galvanized scrap steel according to any one of claims 1 to 6, characterized in that, Also includes: Temperature measuring device (900) is used to detect the temperature information of the electric furnace flue gas in the flue gas duct (200); The control device is connected to the temperature measuring device (900) and the heating device (300) and is used to control the operation of the heating device (300) according to the temperature information of the electric furnace flue gas.

10. The zinc removal system for galvanized scrap steel according to any one of claims 1 to 6, characterized in that, The gas supply pipe (400) is located near the bottom of the furnace body (110) at one end, which is connected to the interior of the furnace body (110); the connecting pipe (540) is located near the top of the furnace body (110) at one end, which is connected to the interior of the furnace body (110).

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