A heavy metal compound reduction device and process

Abstract

This invention relates to the field of metal production equipment technology, and more specifically, to a heavy metal compound reduction device and process. The device includes a decomposition furnace, a reduction furnace, a gas collection box, and a monitoring mechanism. The decomposition furnace has a decomposition inlet, a decomposition outlet, and a decomposition gas outlet. The reduction furnace has a reduction inlet, a reduction outlet, a reduction gas inlet, and a reduction gas outlet. The gas collection box has a gas collection inlet, a gas collection return outlet, and a gas collection outlet. The decomposition gas outlet is connected to the reduction gas inlet, the reduction gas outlet is connected to the gas collection inlet, and the gas collection return outlet is connected to the reduction gas inlet. One end of the monitoring mechanism extends into the reduction furnace and can rise and fall with changes in the height of the carbon powder pile in the reduction furnace. The other end of the monitoring mechanism can drive the gas collection outlet to open. This solution has a high degree of automation, accurately determines the endpoint, reduces errors caused by human operation, ensures complete reaction of raw materials, and improves efficiency and economic benefits.

Description

Technical Field

[0001] This invention relates to the field of metal production equipment technology, and more specifically, to a heavy metal compound reduction device and process. Background Technology

[0002] Due to its low arsenic solubility, high arsenic removal efficiency, high arsenic content, good filtration performance, and relatively high stability and density under acidic to neutral conditions, arsenic-containing stone has attracted much attention in recent years. Gaseous elemental arsenic can be obtained by reducing arsenic-containing stone with carbon powder, and then condensing the gaseous elemental arsenic to obtain pure elemental arsenic. The reaction ultimately produces ferric oxide, elemental arsenic, and carbon monoxide.

[0003] However, in actual production, the reaction endpoint of the intermediate products arsenic trioxide and oxygen with carbon powder is difficult to monitor and determine in a timely and effective manner, resulting in some arsenic trioxide and oxygen being mixed in with the gaseous arsenic, which affects the resource utilization rate and economic benefits, and is not conducive to the promotion and large-scale application of the process. Summary of the Invention

[0004] To overcome the problem that the endpoint of the reduction preparation reaction of heavy metal compounds is difficult to determine in the prior art, the first aspect of the present invention provides a heavy metal compound reduction apparatus.

[0005] A second aspect of the present invention provides a process for reducing heavy metal compounds.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a heavy metal compound reduction device, comprising: a decomposition furnace, a reduction furnace, a gas collection box, and a monitoring mechanism. The decomposition furnace is provided with a decomposition feed inlet, a decomposition discharge inlet, and a decomposition gas outlet. The reduction furnace is provided with a reduction feed inlet, a reduction discharge inlet, a reduction gas inlet, and a reduction gas outlet. The gas collection box is provided with a gas collection inlet, a gas collection return inlet, and a gas collection outlet. The decomposition gas outlet is connected to the reduction gas inlet, the reduction gas outlet is connected to the gas collection inlet, and the gas collection return inlet is connected to the reduction gas inlet. One end of the monitoring mechanism extends into the reduction furnace and can rise and fall with the change in the height of the carbon powder pile in the reduction furnace. The other end of the monitoring mechanism can drive the gas collection outlet to open.

[0007] In the technical solution of this invention, the decomposition furnace is used to heat and decompose solid heavy metal compounds to produce gaseous compounds, and the reduction furnace is used to reduce the gaseous compounds with carbon powder to produce gaseous heavy metal elements. The gas collection box allows unreacted gaseous compounds to be circulated back into the reduction furnace for full reaction. The amount of carbon powder contained in the reduction furnace gradually decreases as the reaction proceeds. When the height of the carbon powder pile decreases to the point where it no longer changes, it indicates that the full reaction has reached its endpoint. At this time, one end of the monitoring mechanism has reached its lowest point, and the other end of the monitoring mechanism automatically opens the gas collection outlet to send the gas inside the device into the next process. This solution has a high degree of automation, accurately determines the endpoint, reduces errors caused by human operation, ensures full reaction of raw materials, and improves efficiency and economic benefits.

[0008] Furthermore, the monitoring mechanism includes a lifting monitoring component and a transmission drive component. The lifting monitoring component extends into the reduction furnace and is elastically and sealed to the reduction furnace. One end of the lifting monitoring component extending into the reduction furnace has a monitoring part for placing on the upper part of the toner pile surface. The other end of the lifting monitoring component located outside the reduction furnace is connected to the input end of the transmission drive component. The output end of the transmission drive component can drive the gas collection outlet to open.

[0009] In this solution, by extending the lifting monitoring component into the reduction furnace and sealing it elastically, and by having the monitoring part contact the upper end of the toner pile, the lifting monitoring component can automatically rise and fall according to the changes in the pile height of the toner during the reaction. When the reaction proceeds to the point where the toner is no longer consumed, the end of the lifting monitoring component located outside the reduction furnace drives the gas collection outlet to open through the transmission drive component, thus realizing the mechanical linkage between the reaction endpoint and the opening of the gas collection outlet, improving the reliability and automation of the reaction control.

[0010] Furthermore, the lifting monitoring assembly also includes a telescopic cover and a monitoring rod. The bottom of the telescopic cover has an opening and is connected to the reduction furnace. The monitoring rod passes through the telescopic cover and is sealed and fixedly connected to the telescopic cover. One end of the monitoring rod inside the telescopic cover is fixedly connected to the monitoring unit, and the other end of the monitoring rod outside the telescopic cover is connected to the transmission drive assembly.

[0011] In this design, a telescopic cover and a monitoring rod are installed, with the monitoring rod passing through the telescopic cover and being sealed and fixedly connected to it. The bottom opening of the telescopic cover is connected to the reduction furnace, which not only achieves a seal between the monitoring rod and the reduction furnace, preventing gas leakage from the furnace, but also allows the monitoring rod to rise and fall with the change in the height of the toner pile, ensuring that the monitoring unit can respond sensitively to toner consumption. The end of the monitoring rod located outside the telescopic cover is connected to the transmission drive assembly, which stably transmits the lifting motion to the drive mechanism, ensuring the sealing and transmission reliability of the device.

[0012] Furthermore, the transmission drive assembly includes a transmission component, a turntable component, and a walking drive component. The turntable component is connected to the lifting monitoring component via the transmission component. The turntable component can rotate in a first direction as the lifting monitoring component is lowered. The walking drive component is connected to the turntable component and can rotate around the turntable component in a second direction. The first direction is opposite to the second direction. When the walking drive component moves around the turntable component to a first stroke position, the walking drive component can open the air collection outlet.

[0013] In this scheme, the linear lifting motion of the monitoring rod is converted into the rotational motion of the turntable component. The walking drive component performs the opposite circular motion on the turntable component. When the initial speeds of the walking drive component and the turntable component are equal, the absolute position of the walking component remains stable. As the reaction proceeds and the carbon powder is consumed, the monitoring rod descends to the lowest point. At this point, the turntable component stops moving, while the walking drive component continues to move to the first stroke position, thereby opening the gas collection outlet.

[0014] Furthermore, the transmission component includes a lifting rack, a first gear, a transmission rod, a second gear, and a first gear ring. The lifting rack is arranged vertically and fixedly connected to the lifting monitoring component. One end of the transmission rod is coaxially fixedly connected to the first gear, and the other end of the transmission rod is coaxially fixedly connected to the second gear. The lifting rack meshes with the first gear, the second gear meshes with the first gear ring, and the first gear ring is fixedly connected to the first surface of the turntable component.

[0015] In this solution, the lifting monitoring component drives the lifting rack to move up and down. The lifting rack meshes with the first gear and drives the second gear to rotate through the transmission rod. The second gear drives the first gear ring to make a circular motion. The first gear ring is fixedly connected to the turntable component, thereby converting the vertical lifting motion of the lifting monitoring component into the rotational motion of the turntable component. By controlling the transmission ratio, the rotational speed of the turntable component can be precisely controlled to match the movement speed of the walking drive component, ensuring accurate control of the opening of the gas collection outlet.

[0016] Furthermore, the turntable component includes a turntable body, a turntable support, a connecting column, and a connecting ring. The turntable body is drivenly connected to the transmission component. One end of the turntable support is fixedly connected to the air collection box, and the other end of the turntable support is movably connected to the turntable body. One end of the connecting column is fixedly connected to the turntable body, and the other end of the connecting column is fixedly connected to the connecting ring. The connecting ring and the turntable body are arranged concentrically.

[0017] In this solution, the turntable support is fixedly connected to the air collection box and provides movable support for the turntable body, enabling the turntable body to rotate stably. The rotation of the turntable body is synchronously transmitted to the connecting ring through the connecting column, and the connecting ring and the turntable body are arranged in the same circle, which ensures the uniformity and stability of the trajectory of the walking drive component when it moves along the circumference on the connecting ring.

[0018] Furthermore, the walking drive component includes a walking motor, a motor support, a third gear, a second gear ring, and a starting column. One end of the motor support is movably connected to the turntable component in the circumferential direction, and the other end of the motor support is fixedly connected to the walking motor. The output shaft of the walking motor is coaxially and fixedly connected to the third gear. The third gear meshes with the second gear ring, and the second gear ring is fixedly connected to the second surface of the turntable component. The starting column is connected to the walking motor, and a first valve is provided on the air collection outlet. When the walking motor moves to the first stroke position, the starting column can push the first valve to open.

[0019] In this solution, the motor support component limits the movement of the walking motor. When the walking motor starts, the third gear meshes with the second gear ring, and the walking motor can move circumferentially around the turntable component. When the movement speed of the walking motor is matched in the opposite direction to the rotation speed of the turntable component, the position of the walking motor remains relatively stable. When the reaction reaches the end point, the turntable stops rotating, and the walking motor continues to move to the first stroke position. The first valve is opened by the starting column, so that the gas collection outlet is automatically opened after the reaction ends.

[0020] Furthermore, the reduction furnace is equipped with an ultrasonic vibration mechanism, which includes an ultrasonic vibrator, a vibrating cylinder, and a dust-suppressing plate. The ultrasonic vibrator is located outside the reduction furnace and is fixedly connected to it. The output end of the ultrasonic vibrator is connected to the vibrating cylinder, which is connected to the reduction furnace. One end of the vibrating cylinder that extends into the reduction furnace is connected to the dust-suppressing plate. The dust-suppressing plate covers the upper part of the internal space of the reduction furnace, and the end of the monitoring mechanism that contacts the carbon powder is located below the dust-suppressing plate.

[0021] In this design, the dust-suppressing plate covers the upper part of the internal space of the reduction furnace. It can shake off the carbon powder attached to the dust-suppressing plate through ultrasonic vibration, making the detection of changes in the height of the carbon powder pile more accurate and improving the reliability of the determination of the reduction reaction endpoint. At the same time, it can shake off the carbon powder adhering to the inner wall of the device, thereby increasing the service life of the device.

[0022] Furthermore, the reduction furnace is provided with a reduction stirring mechanism, which includes a reduction stirring motor, a reduction drive shaft, and a reduction stirring mesh. The reduction stirring motor is fixedly connected to the reduction furnace, and its output end is connected to the reduction drive shaft. The reduction drive shaft extends into the reduction furnace and is connected to the reduction stirring mesh. And / or the decomposition furnace is provided with a decomposition stirring mechanism, which includes a decomposition stirring motor, a decomposition drive shaft, and a decomposition stirring mesh. The decomposition stirring motor is fixedly connected to the decomposition furnace, and its output end is connected to the decomposition drive shaft. The decomposition drive shaft extends into the decomposition furnace and is connected to the decomposition stirring mesh.

[0023] In this scheme, the raw materials in the decomposition furnace can be stirred by the decomposition stirring mechanism to promote the heating and decomposition of the raw materials, and the raw materials in the reduction furnace can be stirred by the reduction stirring mechanism to promote the contact reduction of gaseous compounds with carbon powder to generate gaseous heavy metal elements.

[0024] This invention discloses a heavy metal compound reduction process, implemented using the aforementioned apparatus, comprising: decomposing the heavy metal compound in a decomposition furnace to generate a gaseous compound; inputting the gaseous compound into a reduction furnace to react with carbon powder to generate a mixed gas containing gaseous metal elements and byproduct gases; collecting the mixed gas in a gas collection box and re-introducing it into the reduction furnace for further reaction; and automatically opening the gas collection outlet to send the gas to the next process when the carbon powder pile height in the reduction furnace no longer decreases.

[0025] Compared with the prior art, the beneficial effects of the present invention are: I. The heavy metal compound reduction device of the present invention includes a decomposition furnace for heating and decomposing solid heavy metal compounds to produce gaseous compounds, and a reduction furnace for reacting the gaseous compounds with carbon powder to generate gaseous heavy metal elements. An unreacted gaseous compound is circulated back into the reduction furnace for complete reaction through a gas collection box. The amount of carbon powder in the reduction furnace gradually decreases as the reaction proceeds. When the carbon powder pile height decreases to a point where it no longer changes, it indicates that the reaction has reached its endpoint. At this point, one end of the monitoring mechanism has lowered to its lowest point, and the other end of the monitoring mechanism automatically opens the gas collection outlet, sending the gas inside the device into the next process. This solution has a high degree of automation, accurately determines the endpoint, reduces errors caused by human operation, ensures complete reaction of raw materials, and improves efficiency and economic benefits.

[0026] II. The heavy metal compound reduction process of the present invention, when used in conjunction with the device of the present invention, involves the mixed gas circulating in the reduction furnace and the gas collection box, allowing unreacted gaseous compounds to participate in the reaction again, thereby improving the utilization rate of raw materials. When the carbon powder pile height in the reduction furnace no longer decreases, the monitoring mechanism automatically opens the gas collection outlet to send the gas to the next process. The cessation of carbon powder consumption is used as the criterion for judging the reaction endpoint, ensuring the sufficiency of the reaction. At the same time, the automatic connection between the circulating reaction and the endpoint exhaust is realized, simplifying the operation process and facilitating subsequent condensation and separation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the heavy metal compound reduction device of the present invention; Figure 2 yes Figure 1 A diagram from the bottom perspective; Figure 3 This is a schematic diagram of the internal structure of the decomposition furnace and the reduction furnace; Figure 4 yes Figure 3 Enlarged view of point A; Figure 5 yes Figure 3 Enlarged view of point B; Figure 6 This is a schematic diagram from above, showing the heavy metal compound reduction apparatus of the present invention. Figure 7 yes Figure 6 Enlarged view of point C; Figure 8 yes Figure 6 Enlarged view of point D; Figure 9 This is a structural diagram of one side of the transmission component; Figure 10 This is a schematic diagram of the structure on the other side of the transmission component; Figure 11 This is a structural diagram of the turntable component; Figure 12 This is a schematic diagram of the air intake head; Figure 13 This is a schematic diagram of the cross-sectional shape of the reducing and decomposing mixing mesh.

[0028] In the attached diagram: 1. Decomposition furnace; 11. Decomposition feed inlet; 12. Decomposition discharge outlet; 13. Decomposition gas outlet; 2. Reduction furnace; 21. Reduction feed inlet; 22. Reduction discharge outlet; 23. Reduction gas inlet; 231. Gas inlet head; 232. Aeration inner pipe; 24. Reduction gas outlet; 3. Gas collection box; 31. Gas collection inlet; 32. Gas collection return outlet; 33. Gas collection outlet; 331. First valve; 34. Blocking component; 4. Monitoring mechanism; 41. Lifting monitoring assembly; 411. Monitoring section; 412. Telescopic cover; 413. Monitoring rod; 42. Transmission drive assembly; 421. Transmission component; 4211. Lifting rack; 4212. First gear; 4213. Transmission rod; 4214. Second gear; 4215. First gear ring; 4216. Transmission support. 422. Turntable assembly; 4221. Turntable body; 42211. Annular groove; 4222. Turntable support; 42221. Support base; 42222. Support crossbar; 42223. Support rotating component; 4223. Connecting column; 4224. Connecting ring; 423. Walking drive component; 4231. Walking motor; 4232. Motor support; 4233. Third gear; 4234. Second gear ring; 4235. Starting column; 5. Ultrasonic vibration mechanism; 51. Ultrasonic vibrator; 52. Vibrating cylinder; 53. Dust reducing plate; 6. Reduction stirring mechanism; 61. Reduction stirring motor; 62. Reduction drive shaft; 63. Reduction stirring mesh; 7. Decomposition stirring mechanism; 71. Decomposition stirring motor; 72. Decomposition drive shaft; 73. Decomposition stirring mesh. Detailed Implementation

[0029] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0030] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] The technical solution of the present invention will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example 1 refer to Figures 1 to 13 This embodiment discloses a heavy metal compound reduction device, including a decomposition furnace 1, a reduction furnace 2, a gas collection box 3, and a monitoring mechanism 4. The decomposition furnace 1 is provided with a decomposition feed inlet 11, a decomposition discharge outlet 12, and a decomposition gas outlet 13. The reduction furnace 2 is provided with a reduction feed inlet 21, a reduction discharge outlet 22, a reduction gas inlet 23, and a reduction gas outlet 24. The gas collection box 3 is provided with a gas collection inlet 31, a gas collection return outlet 32, and a gas collection outlet 33. The decomposition gas outlet 13 is connected to the reduction gas inlet 23, the reduction gas outlet 24 is connected to the gas collection inlet 31, and the gas collection return outlet 32 ​​is connected to the reduction gas inlet 23. One end of the monitoring mechanism 4 extends into the reduction furnace 2 and can rise and fall with the change in the height of the carbon powder pile in the reduction furnace. The other end of the monitoring mechanism 4 can drive the gas collection outlet 33 to open.

[0032] In this embodiment, the decomposition furnace 1 is used to heat and decompose solid heavy metal compounds to produce gaseous compounds, and the reduction furnace 2 is used to reduce the gaseous compounds with carbon powder to produce gaseous heavy metal elements. Unreacted gaseous compounds are circulated back into the reduction furnace 2 for complete reaction through the gas collection box 3. The amount of carbon powder in the reduction furnace gradually decreases as the reaction proceeds. When the carbon powder pile height decreases to a point where it no longer changes, it indicates that the reaction has reached its endpoint. At this time, one end of the monitoring mechanism 4 has reached its lowest point, and the other end of the monitoring mechanism 4 automatically opens the gas collection outlet 33, sending the gas inside the device into the next process. This solution has a high degree of automation, accurately determines the endpoint, reduces errors caused by human operation, ensures complete reaction of raw materials, and improves efficiency and economic benefits.

[0033] In a more specific embodiment, the material fed into the decomposition furnace can be ferrous arsenate, and carbon powder is placed in the reduction furnace. The ferrous arsenate undergoes primary decomposition in the decomposition furnace (500-650°C), converting anhydrous ferric arsenate into ferric oxide (Fe₂O₃) and arsenic pentoxide (As₂O₅) (gaseous). The arsenic pentoxide (As₂O₅) (gaseous) further decomposes into arsenic trioxide (As₂O₃) (gaseous) and oxygen (O₂). The arsenic trioxide (As₂O₃) (gaseous) and oxygen (O₂) further react with the carbon powder in the reduction furnace to generate gaseous arsenic and carbon monoxide. The mixed gas also includes unreacted gaseous arsenic trioxide and oxygen. This mixed gas is collected in a gas collection box and then reintroduced into the reduction furnace for further reaction. A gas pump can be installed on the connected pipeline. In other embodiments, other materials capable of generating gaseous products through oxidation-reduction reactions with carbon powder can also be produced using the apparatus of this embodiment.

[0034] Multiple reduction inlets 23 are located at the bottom of the reduction furnace 2, and each inlet 23 is connected to the decomposition outlet 13 or the gas collection return port 32 via pipelines. Valves can be installed on each pipeline to control the connection. One end of the reduction inlet 23 extending into the reduction furnace 2 is equipped with an inlet head 231. Multiple aeration inner tubes 232 connected to the pipelines are installed inside the inlet head 231. The outlets of the aeration inner tubes 232 face downwards and are higher than the bottom edge of the inlet head 231. A mesh cover can also be installed on the outside of the inlet head 231 to prevent blockage by materials. The multiple aeration inner tubes 232 on the inlet head 231 can send the mixed gas into the reduction furnace 2 in small streams to react with the carbon powder, ensuring sufficient contact between the mixed gas and the carbon powder, maximizing the reduction rate, and allowing more gaseous arsenic trioxide and oxygen to react with the carbon powder to generate gaseous arsenic and carbon monoxide. The monitoring unit 411 can be a hollow sphere with a large contact area with the carbon powder pile surface, so that it can descend together with the carbon powder pile surface when it descends, or rise with the pile surface when carbon powder is added to the reduction furnace.

[0035] refer to Figure 1 Support frames are provided at the bottom of the decomposition furnace 1, reduction furnace 2 and gas collection box 3 to support each component and provide installation space at the bottom, facilitating the installation of other pipes, valves or motors and other parts.

[0036] refer to Figure 1 and Figure 2 The monitoring mechanism 4 includes a lifting monitoring component 41 and a transmission drive component 42. The lifting monitoring component 41 extends into the reduction furnace 2 and is elastically and sealed to the reduction furnace 2. One end of the lifting monitoring component 41 extending into the reduction furnace 2 has a monitoring part 411 for placing on the upper part of the toner pile surface. The other end of the lifting monitoring component 41 located outside the reduction furnace 2 is connected to the input end of the transmission drive component 42. The output end of the transmission drive component 42 can drive the gas collection outlet 33 to open.

[0037] Specifically, the lifting monitoring component 41 is located on one side of the reduction furnace 2. A side cavity communicating with the main chamber can be provided on the side of the reduction furnace 2. One end of the lifting monitoring component 41 extends into the side cavity and contacts the carbon powder pile surface inside the reduction furnace. The transmission drive component 42 is connected from the side to the top of the gas collecting box 3, and can open the valve above the gas collecting box 3, thereby sending the gas inside the gas collecting box 3 to the next process, such as condensation and separation of solid metal elements.

[0038] In this embodiment, by extending the lifting monitoring component 41 into the reduction furnace 2 and sealing it elastically, the monitoring part 411 can contact the toner pile surface, allowing the lifting monitoring component 41 to automatically rise and fall according to the change in the pile height caused by the toner reaction. When the reaction proceeds to the point where the toner is no longer consumed, the end of the lifting monitoring component 41 located outside the reduction furnace 2 drives the gas collection outlet 33 to open through the transmission drive component 42, realizing the mechanical linkage between the reaction endpoint and the opening of the gas collection outlet 33, thereby improving the reliability and automation of the reaction control.

[0039] refer to Figure 1 and Figure 3 The lifting monitoring component 41 also includes a telescopic cover 412 and a monitoring rod 413. The bottom of the telescopic cover 412 has an opening and is connected to the reduction furnace 2. The monitoring rod 413 passes through the telescopic cover 412 and is sealed and fixedly connected to the telescopic cover 412. One end of the monitoring rod 413 located inside the telescopic cover 412 is fixedly connected to the monitoring part 411, and the other end of the monitoring rod 413 located outside the telescopic cover is connected to the transmission drive component 42.

[0040] Specifically, the lower opening of the telescopic cover 412 is connected to the top opening of the side of the reduction furnace 2, forming an integral sealed structure. The monitoring rod 413 passes through the telescopic cover 412, ensuring a seal at the connection point. Therefore, the change in the height of the carbon powder pile caused by the carbon powder reaction will change the degree of telescopic cover 412's extension and contraction. In the initial state, the carbon powder is heavier and the pile is higher, so the overall position of the monitoring rod is higher, and the telescopic cover 412 is extended to a higher position. As the carbon powder is gradually consumed, the weight decreases, the pile decreases, the monitoring rod decreases accordingly, and the telescopic cover 412 is gradually compressed to a lower position. When the reaction reaches its endpoint, the carbon powder is no longer consumed, and the monitoring rod 413 moves to its lowest point. The upper end of the monitoring rod 413 is connected to the transmission drive assembly 42, which can convert the change in the height of the carbon powder pile caused by the carbon powder reaction into physical motion, thereby driving the gas collection outlet 33 of the gas collection box 3 to open. The middle part of the monitoring rod 413 is connected to the gas collection box 3 through two positioning buckles, and the monitoring rod 413 can move up and down in the positioning buckles.

[0041] In this embodiment, by setting a telescopic cover 412 and a monitoring rod 413, the monitoring rod 413 passes through the telescopic cover 412 and is sealed and fixedly connected to it. The bottom opening of the telescopic cover 412 is connected to the reduction furnace 2, which not only achieves the sealing between the monitoring rod 413 and the reduction furnace 2, preventing gas leakage from the furnace, but also allows the monitoring rod 413 to rise and fall with the change in the height of the carbon powder reaction, ensuring that the monitoring unit 411 can sensitively respond to carbon powder consumption. The end of the monitoring rod 413 located outside the telescopic cover is connected to the transmission drive assembly 42, which stably transmits the lifting motion to the drive mechanism, ensuring the sealing and transmission reliability of the device.

[0042] refer to Figures 6 to 11 The transmission drive assembly 42 includes a transmission component 421, a turntable component 422, and a walking drive component 423. The turntable component 422 is connected to the lifting monitoring assembly 41 via the transmission component 421. The turntable component 422 can rotate in a first direction as the lifting monitoring assembly 41 is lowered. The walking drive component 423 is connected to the turntable component 422 and can rotate around the turntable component 422 in a second direction. The first direction is opposite to the second direction. When the walking drive component 423 moves around the turntable component 422 to a first stroke position, the walking drive component 423 can open the air collection outlet 33.

[0043] In this embodiment, the linear lifting motion of the monitoring rod 413 is converted into the rotational motion of the turntable component 422. The walking drive component 423 performs the opposite circular motion on the turntable component 422. When the initial speeds of the walking drive component 423 and the turntable component 422 are equal, the absolute position of the walking component remains stable. As the reaction proceeds and the carbon powder is consumed, the monitoring rod 413 descends to the lowest point. At this point, the turntable component 422 stops moving, while the walking drive component 423 continues to move to the first stroke position, thereby opening the gas collection outlet 33.

[0044] refer to Figure 9 and Figure 10 The transmission component 421 includes a lifting rack 4211, a first gear 4212, a transmission rod 4213, a second gear 4214, and a first gear ring 4215. The lifting rack 4211 is arranged vertically and fixedly connected to the lifting monitoring component 41. One end of the transmission rod 4213 is coaxially fixedly connected to the first gear 4212, and the other end of the transmission rod 4213 is coaxially fixedly connected to the second gear 4214. The lifting rack 4211 meshes with the first gear 4212, and the second gear 4214 meshes with the first gear ring 4215. The first gear ring 4215 is fixedly connected to the first surface of the turntable component 422.

[0045] Specifically, the transmission rod 4213 can be connected to the air collection box 3 via a transmission support 4216. The bottom of the transmission support 4216 is fixedly connected to the air collection box 3, and the top of the transmission support 4216 is rotatably connected to the transmission rod 4213, providing support for the transmission rod 4213. Multiple transmission bases can be provided to offer more stable support. The outer diameter of the second gear 4214 can be larger than the outer diameter of the first gear 4212. For example, the outer diameter of the second gear 4214 is approximately seven times that of the first gear 4212, which can amplify the slight descent of the monitoring rod 413 and convert it into a large rotation of the turntable component 422.

[0046] In this embodiment, the lifting monitoring component 41 drives the lifting rack 4211 to move up and down. The lifting rack 4211 meshes with the first gear 4212 and drives the second gear 4214 to rotate through the transmission rod 4213. The second gear 4214 drives the first gear ring 4215 to perform circumferential motion. The first gear ring 4215 is fixedly connected to the turntable component 422, thereby converting the vertical lifting motion of the lifting monitoring component 41 into the rotational motion of the turntable component 422. By controlling the transmission ratio, the rotational speed of the turntable component 422 can be precisely controlled to match the movement speed of the walking drive component 423, ensuring accurate control of the opening of the air collection outlet 33.

[0047] refer to Figure 10 and Figure 11 The turntable component 422 includes a turntable body 4221, a turntable support 4222, a connecting column 4223, and a connecting ring 4224. The turntable body 4221 is connected to the transmission component 421. One end of the turntable support 4222 is fixedly connected to the air collection box 3, and the other end of the turntable support 4222 is movably connected to the turntable body 4221. One end of the connecting column 4223 is fixedly connected to the turntable body 4221, and the other end of the connecting column 4223 is fixedly connected to the connecting ring 4224. The connecting ring 4224 and the turntable body 4221 are arranged concentrically.

[0048] Specifically, the turntable support 4222 includes a support base 42221, a support crossbar 42222, and a support rotating component 42223. The support base 42221 is fixedly connected to the air collection box 3, the support crossbar 42222 is fixedly connected to the support base 42221, and the support rotating component 42223 is rotatably connected to the support crossbar 42222. An annular groove 42211 is provided at the bottom of the turntable body 4221, and the support rotating component 42223 is rotatably disposed in the annular groove 42211. Two annular grooves 42211 can be provided, respectively located on both sides of the first toothed ring 4215, and two turntable support components 4222 are provided thereon to provide stable support and guidance.

[0049] In this embodiment, the turntable support 4222 is fixedly connected to the air collection box 3 and provides movable support for the turntable body 4221, enabling the turntable body 4221 to rotate stably. The rotation of the turntable body 4221 is synchronously transmitted to the connecting ring 4224 through the connecting column 4223. The connecting ring 4224 and the turntable body 4221 are arranged at the same center, ensuring the uniformity and stability of the trajectory of the walking drive component 423 when it moves along the circumference on the connecting ring 4224.

[0050] refer to Figure 7 and Figure 8 The walking drive component 423 includes a walking motor 4231, a motor support 4232, a third gear 4233, a second gear ring 4234, and a starting column 4235. One end of the motor support 4232 is movably connected to the turntable component 422 in the circumferential direction, and the other end of the motor support 4232 is fixedly connected to the walking motor 4231. The output shaft of the walking motor 4231 is coaxially fixedly connected to the third gear 4233. The third gear 4233 meshes with the second gear ring 4234, and the second gear ring 4234 is fixedly connected to the second surface of the turntable component 422. The starting column 4235 is connected to the walking motor 4231. A first valve 331 is provided on the air collection outlet 33. When the walking motor 4231 moves to the first stroke position, the starting column 4235 can push the first valve 331 to open.

[0051] Specifically, after the travel motor 4231 moves to the first established position, a blocking member 34 connected to the air collection box 3 can be installed at a position behind it to restrict the travel motor 4231 from continuing to move. One end of the motor support member 4232 can be slidably connected to the connecting ring 4224 of the turntable component 422 via a sleeve, thereby restricting the travel motor 4231 from moving circumferentially along the turntable component 422. The starting column 4235 can be fixedly connected to the fixed end of the travel motor 4231, or it can be coaxially fixedly connected to the third gear 4233, as long as the starting column 4235 can be relatively stable when the travel drive component 423 moves.

[0052] In this embodiment, the motor support 4232 limits the movement of the walking motor 4231. When the walking motor 4231 starts, the third gear 4233 meshes with the second gear ring 4234, and the walking motor 4231 can move circumferentially around the turntable component 422. When the movement speed of the walking motor 4231 is matched in the opposite direction to the rotation speed of the turntable component, the position of the walking motor 4231 remains relatively stable. When the reaction reaches the end point, the turntable stops rotating, and the walking motor 4231 continues to move to the first stroke position. The first valve 331 is opened by the starting column 4235, so that the gas collection outlet 33 is automatically opened after the reaction ends.

[0053] refer to Figure 5 The reduction furnace 2 is equipped with an ultrasonic vibration mechanism 5, which includes an ultrasonic vibrator 51, a vibration cylinder 52, and a dust-collecting plate 53. The ultrasonic vibrator 51 is located outside the reduction furnace 2 and fixedly connected to it. The output end of the ultrasonic vibrator 51 is connected to the vibration cylinder 52, which is also connected to the reduction furnace 2. One end of the vibration cylinder 52 extending into the reduction furnace 2 is connected to the dust-collecting plate 53, which covers the upper part of the internal space of the reduction furnace 2. The monitoring part 411 of the monitoring mechanism 4 is located below the dust-collecting plate 53. The main body of the dust-collecting plate 53 is approximately trumpet-shaped, covering the upper part of the reduction furnace 2. A portion of the side of the dust-collecting plate 53 extends out to cover the upper part of the monitoring part 411, and a through hole is provided in this portion of the dust-collecting plate 53 for the monitoring rod 413 to pass through.

[0054] In this embodiment, the dust-sinking plate 53 covers the interior space of the reduction furnace 2. Ultrasonic vibration causes the carbon powder adhering to the dust-sinking plate 53 to be shaken off, making the detection of changes in the carbon powder pile height more accurate and improving the reliability of determining the endpoint of the reduction reaction. Simultaneously, it shakes off carbon powder adhering to the inner wall of the device, extending the service life of the device.

[0055] Example 2 refer to Figures 1 to 13 This embodiment is similar to Embodiment 1, disclosing a heavy metal compound reduction device. The difference between this embodiment and Embodiment 1 is that, referring to... Figure 3 In this embodiment, the reduction furnace 2 is provided with a reduction stirring mechanism 6, which includes a reduction stirring motor 61, a reduction drive shaft 62, and a reduction stirring mesh 63. The reduction stirring motor 61 is fixedly connected to the reduction furnace 2, and the output end of the reduction stirring motor 61 is connected to the reduction drive shaft 62. The reduction drive shaft 62 extends into the reduction furnace 2 and is connected to the reduction stirring mesh 63.

[0056] refer to Figure 3The decomposition furnace 1 is provided with a decomposition stirring mechanism 7, which includes a decomposition stirring motor 71, a decomposition drive shaft 72, and a decomposition stirring mesh 73. The decomposition stirring motor 71 is fixedly connected to the decomposition furnace 1, and the output end of the decomposition stirring motor 71 is connected to the decomposition drive shaft 72. The decomposition drive shaft 72 extends into the decomposition furnace 1 and is connected to the decomposition stirring mesh 73.

[0057] Specifically, both the reduction stirring mesh 63 and the decomposition stirring mesh 73 have a four-pointed star cross-section, which increases the contact area with the carbon powder during rotational stirring, thereby enhancing the stirring effect. Simultaneously, the stirring meshes are staggered with each air inlet head 231, allowing the rotating stirring bars to continuously refresh the carbon powder around the air inlet heads 231. The carbon powder disturbance caused by the rotational stirring facilitates the reduction reaction between the mixed gas exiting the air inlet heads 231 and the carbon powder, while also allowing the generated gaseous arsenic and carbon monoxide to escape from the carbon powder pile in a timely manner. In this embodiment, the left side of the decomposition stirring mesh 73 is longer than the right side; after rotation, the stirring positions of the vertical bars on both sides can intersect, forming a complementary effect, thereby further improving the stirring effect.

[0058] In this embodiment, the decomposition stirring mechanism 7 can stir the raw materials in the decomposition furnace 1 to promote the heating and decomposition of the raw materials, and the reduction stirring mechanism 6 can stir the raw materials in the reduction furnace 2 to promote the contact reduction of gaseous compounds with carbon powder to generate gaseous heavy metal elements.

[0059] Example 3 This embodiment discloses a heavy metal compound reduction process, referring to... Figures 1 to 13 The process is implemented using an apparatus as described in Example 1 or Example 2, including: decomposing heavy metal compounds in a decomposition furnace 1 to produce gaseous compounds; inputting the gaseous compounds into a reduction furnace 2 to react with carbon powder to generate a mixed gas containing gaseous metal elements and byproduct gases; collecting the mixed gas in a gas collection box 3 and re-introducing it into the reduction furnace 2 for further reaction; and automatically opening the gas collection outlet 33 to send the gas to the next process when the height of the carbon powder pile in the reduction furnace 2 no longer decreases.

[0060] In a specific application scenario, when the heavy metal compound in decomposition furnace 1 is ferrous oxide, the ferrous oxide undergoes primary decomposition (500-650℃) in the decomposition furnace. Anhydrous ferric arsenate is converted into ferric oxide (Fe₂O₃) and arsenic pentoxide (As₂O₅) (gaseous). The arsenic pentoxide (As₂O₅) (gaseous) further decomposes into arsenic trioxide (As₂O₃) (gaseous) and oxygen (O₂). The arsenic trioxide (As₂O₃) (gaseous) and oxygen (O₂) further react with carbon powder in the reduction furnace to generate gaseous arsenic and carbon monoxide. The mixed gas also includes unreacted gaseous arsenic trioxide and oxygen. At this point, the by-product gases include at least carbon monoxide, as well as unreacted gaseous arsenic trioxide and oxygen.

[0061] The heavy metal compound reduction process in this embodiment is used in conjunction with a heavy metal compound reduction device. The mixed gas circulates in the reduction furnace 2 and the gas collection box 3, allowing the unreacted gaseous compounds to participate in the reaction again, which improves the utilization rate of raw materials. When the height of the carbon powder pile in the monitoring device 4 no longer decreases, the monitoring device 4 automatically opens the gas collection outlet 33 to send the gas to the next process. Whether the carbon powder consumption stops is used as the basis for judging the reaction endpoint, which ensures the sufficiency of the reaction. At the same time, it realizes the automatic connection between the cyclic reaction and the endpoint exhaust, which simplifies the operation process and facilitates subsequent condensation and separation.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A heavy metal compound reduction device, characterized in that: The system includes a decomposition furnace (1), a reduction furnace (2), a gas collection box (3), and a monitoring mechanism (4). The decomposition furnace (1) is provided with a decomposition feed inlet (11), a decomposition discharge outlet (12), and a decomposition gas outlet (13). The reduction furnace (2) is provided with a reduction feed inlet (21), a reduction discharge outlet (22), a reduction gas inlet (23), and a reduction gas outlet (24). The gas collection box (3) is provided with a gas collection inlet (31), a gas collection return outlet (32), and a gas collection outlet (33). The decomposition outlet (13) is connected to the reduction inlet (23), the reduction outlet (24) is connected to the gas collection inlet (31), the gas collection return port (32) is connected to the reduction inlet (23), one end of the monitoring mechanism (4) extends into the reduction furnace (2) and can rise and fall with the change of carbon powder pile height in the reduction furnace (2), and the other end of the monitoring mechanism (4) can drive the gas collection outlet (33) to open.

2. The heavy metal compound reduction apparatus according to claim 1, characterized in that: The monitoring mechanism (4) includes a lifting monitoring component (41) and a transmission drive component (42). The lifting monitoring component (41) extends into the reduction furnace (2) and is elastically and sealed to the reduction furnace (2). One end of the lifting monitoring component (41) extending into the reduction furnace (2) has a monitoring part (411) for placing on the upper part of the toner pile. The other end of the lifting monitoring component (41) located outside the reduction furnace (2) is connected to the input end of the transmission drive component (42). The output end of the transmission drive component (42) can drive the gas collection outlet (33) to open.

3. The heavy metal compound reduction apparatus according to claim 2, characterized in that: The lifting monitoring component (41) also includes a telescopic cover (412) and a monitoring rod (413). The bottom of the telescopic cover (412) is provided with an opening and is connected to the reduction furnace (2). The monitoring rod (413) passes through the telescopic cover (412) and is sealed and fixedly connected to the telescopic cover (412). One end of the monitoring rod (413) located inside the telescopic cover (412) is fixedly connected to the monitoring part (411), and the other end of the monitoring rod (413) located outside the telescopic cover (412) is connected to the transmission drive component (42).

4. The heavy metal compound reduction apparatus according to claim 2, characterized in that: The transmission drive assembly (42) includes a transmission component (421), a turntable component (422), and a walking drive component (423). The turntable component (422) is connected to the lifting monitoring assembly (41) via the transmission component (421). The turntable component (422) can rotate in a first direction as the lifting monitoring assembly (41) is lowered. The walking drive component (423) is connected to the turntable component (422) and can rotate around the turntable component (422) in a second direction. The first direction is opposite to the second direction. When the walking drive component (423) moves around the turntable component (422) to the first stroke position, the walking drive component (423) can open the air collection outlet (33).

5. The heavy metal compound reduction apparatus according to claim 4, characterized in that: The transmission component (421) includes a lifting rack (4211), a first gear (4212), a transmission rod (4213), a second gear (4214), and a first gear ring (4215). The lifting rack (4211) is arranged vertically and fixedly connected to the lifting monitoring component (41). One end of the transmission rod (4213) is coaxially fixedly connected to the first gear (4212), and the other end of the transmission rod (4213) is coaxially fixedly connected to the second gear (4214). The lifting rack (4211) meshes with the first gear (4212), the second gear (4214) meshes with the first gear ring (4215), and the first gear ring (4215) is fixedly connected to the first surface of the turntable component (422).

6. The heavy metal compound reduction apparatus according to claim 4, characterized in that: The turntable component (422) includes a turntable body (4221), a turntable support (4222), a connecting column (4223), and a connecting ring (4224). The turntable body (4221) is connected to the transmission component (421). One end of the turntable support (4222) is fixedly connected to the air collection box (3), and the other end of the turntable support (4222) is movably connected to the turntable body (4221). One end of the connecting column (4223) is fixedly connected to the turntable body (4221), and the other end of the connecting column (4223) is fixedly connected to the connecting ring (4224). The connecting ring (4224) and the turntable body (4221) are arranged at the same center.

7. The heavy metal compound reduction apparatus according to claim 4, characterized in that: The walking drive component (423) includes a walking motor (4231), a motor support (4232), a third gear (4233), a second gear ring (4234), and a starting column (4235). One end of the motor support (4232) is movably connected to the turntable component (422) in the circumferential direction, and the other end of the motor support (4232) is fixedly connected to the walking motor (4231). The output shaft of the walking motor (4231) is coaxially fixedly connected to the third gear (4235). 4233), the third gear (4233) meshes with the second gear ring (4234), the second gear ring (4234) is fixedly connected to the second surface of the turntable component (422), the starting column (4235) is connected to the walking motor (4231), the air collection outlet (33) is provided with a first valve (331), when the walking motor (4231) moves to the first stroke position, the starting column (4235) can push the first valve (331) to open.

8. The heavy metal compound reduction apparatus according to claim 1, characterized in that: The reduction furnace (2) is provided with an ultrasonic vibration mechanism (5), which includes an ultrasonic vibrator (51), a vibration cylinder (52), and a dust-reducing plate (53). The ultrasonic vibrator (51) is located outside the reduction furnace (2) and is fixedly connected to the reduction furnace (2). The output end of the ultrasonic vibrator (51) is connected to the vibration cylinder (52). The vibration cylinder (52) is connected to the reduction furnace (2). One end of the vibration cylinder (52) that extends into the reduction furnace (2) is connected to the dust-reducing plate (53). The dust-reducing plate (53) covers the upper part of the internal space of the reduction furnace (2). The end of the monitoring mechanism (4) that contacts the carbon powder is located below the dust-reducing plate (53).

9. The heavy metal compound reduction apparatus according to claim 1, characterized in that: The reduction furnace (2) is provided with a reduction stirring mechanism (6), which includes a reduction stirring motor (61), a reduction drive shaft (62), and a reduction stirring mesh (63). The reduction stirring motor (61) is fixedly connected to the reduction furnace (2), and the output end of the reduction stirring motor (61) is connected to the reduction drive shaft (62). The reduction drive shaft (62) extends into the reduction furnace (2) and is connected to the reduction stirring mesh (63). And / or the decomposition furnace (1) is provided with a decomposition stirring mechanism (7), which includes a decomposition stirring motor (71), a decomposition drive shaft (72), and a decomposition stirring mesh (73). The decomposition stirring motor (71) is fixedly connected to the decomposition furnace (1), and the output end of the decomposition stirring motor (71) is connected to the decomposition drive shaft (72). The decomposition drive shaft (72) extends into the decomposition furnace (1) and is connected to the decomposition stirring mesh (73).

10. A heavy metal compound reduction process, implemented using the apparatus described in any one of claims 1 to 9, characterized in that, include: In the decomposition furnace (1), heavy metal compounds are decomposed to produce gaseous compounds. The gaseous compounds are fed into the reduction furnace (2) to react with carbon powder to generate a mixed gas containing gaseous metal elements and by-product gases. The mixed gas is collected in the gas collection box (3) and reintroduced into the reduction furnace (2) for reaction. When the height of the carbon powder pile in the reduction furnace (2) no longer decreases, the monitoring mechanism (4) automatically opens the gas collection outlet (33) to send the gas into the next process.

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