A rotary hearth furnace for processing lead-zinc smelting slag

Abstract

A rotary hearth furnace for processing lead-zinc smelting slag belongs to the field of lead-zinc smelting waste slag treatment equipment. Addressing the problems of slow heat dissipation and low-grade recovered hot air during the cooling process of high-temperature slag in existing equipment due to surface thermal boundary layer stagnation, the following technical solution is proposed: The rotary hearth furnace includes a furnace body, a feeding hopper, a conveying box, and a collection car. A negative pressure turbulent heat exchange channel is constructed: a feeding roller with spiral blades is installed between the furnace body and the conveying box to control the material flow thickness; the feeding hopper is equipped with a heat exchange mechanism consisting of serpentine heat exchange tubes and a fan. A high-frequency baffle plate driven by an eccentric wheel is specially installed at the top of the conveying box to actively break the hot air stagnation layer on the slag surface and forcibly enhance convective heat transfer. The end of the conveying box achieves airtight docking with the collection car through a limiting plate, guide sleeve, and insert rod, transforming the collection car into a directional air intake damper. This device can significantly increase the enthalpy of the extracted hot air to efficiently preheat the raw materials, while eliminating the hidden danger of "external cold and internal heat" in the slag, thus improving operational efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of lead-zinc smelting waste slag treatment equipment, and relates to a rotary hearth furnace for treating lead-zinc smelting slag. Background Technology

[0002] Rotary hearth furnaces are key equipment for processing lead-zinc smelting slag and recovering valuable metals. During the production process, the high-temperature waste slag discharged from the bottom of the furnace contains a huge amount of sensible heat energy. Cooling it and recovering the waste heat is the only way to reduce energy consumption.

[0003] However, existing rotary hearth furnace slag cooling and recovery systems have significant technical bottlenecks at the thermodynamic level:

[0004] 1. When high-temperature smelting slag moves on a conveyor belt, its surface heats the surrounding air, forming a relatively static and high-temperature "thermal boundary layer." In traditional natural ventilation or laminar flow cooling modes, this layer of hot air acts like an insulating film around the slag surface, cutting off the radiation and convection channels for heat from the slag's interior to the external environment. This not only leads to a significant decrease in the cooling rate but also causes a pseudo-cooling state of "hard outer shell and molten core" in the slag. The high-temperature core is highly susceptible to equipment burn-out or reignition accidents during subsequent aggregate storage.

[0005] 2. Due to the obstruction of the aforementioned thermal boundary layer, the air flowing over the slag surface cannot fully absorb heat, resulting in low temperature and insufficient enthalpy of the exhaust gas extracted by the waste heat recovery system. When this hot air is introduced into the feeding end to preheat the raw materials, the temperature difference is too small to penetrate the raw material accumulation layer for effective heating, rendering the waste heat recovery device useless, and the furnace still needs to consume a large amount of primary energy to maintain the reaction temperature.

[0006] 3. Existing material collection methods are mostly open-type discharge, where a large amount of high-temperature hot air escapes disorderly at the collection port and fails to be captured and utilized by the negative pressure system, further aggravating energy waste. Utility Model Content

[0007] In view of this, in order to solve the problem that the lack of effective preheating of raw materials before they enter the furnace body leads to the furnace body consuming more energy to maintain the reaction temperature, this utility model provides a rotary hearth furnace for processing lead-zinc smelting slag.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a rotary hearth furnace for processing lead-zinc smelting slag, comprising:

[0009] The furnace body and the feeding hopper are located on one side of the furnace body. A discharge port is located on one side of the furnace body, and a conveying box for transferring materials is located on the side of the discharge port. A feeding roller is rotatably connected between the conveying box and the furnace body. The feeding roller is located above the furnace bottom of the furnace body, and spiral blades are fixed around the circumference of the feeding roller.

[0010] The conveyor box has a discharge port at the end away from the furnace body. A collection car is set on one side of the discharge port. The collection car blocks the discharge port by contacting it. Multiple through first air holes are opened on one side of the collection car. Multiple second air holes are set on the top of the conveyor box.

[0011] A bracket is fixedly connected to one side of the outer wall of the conveyor box, and a second motor is fixedly connected to the top inner wall of the bracket. The circumference of the output shaft of the second motor is connected to one end of the feeding roller through a belt pulley.

[0012] The feeding mechanism is located inside the conveyor box and is used to transport raw materials.

[0013] The heat exchange mechanism is installed inside the feeding hopper to preheat the incoming material.

[0014] Furthermore, the feeding mechanism includes two conveying rollers and a first motor. The conveying rollers are rotatably connected between the two sides of the conveying box. A conveyor belt is connected between the two conveying rollers. Multiple evenly distributed baffles are fixedly connected to the outer wall of the conveyor belt. The first motor is fixed to one side of the outer wall of the conveying box, and one end of the output shaft of the first motor is fixed to one of the conveying rollers.

[0015] Furthermore, a through hole is provided on one side of each baffle.

[0016] Furthermore, the heat exchange mechanism includes a heat exchange shell and a fan. The heat exchange shell is fixed to the bottom surface of the feeding hopper, and a heat exchange tube is fixedly connected to the top inner wall of the heat exchange shell. The heat exchange tube is arranged in a serpentine bend and both ends pass through the feeding hopper. One end of the heat exchange tube is fixedly connected to the side of the conveying box near the furnace body. The fan is set on one side of the conveying box, and the other end of the heat exchange tube is fixedly connected to the exhaust end of the fan. The exhaust end of the fan is connected to the external waste gas treatment equipment through a pipeline.

[0017] Furthermore, the top of the conveyor box is equipped with multiple turbulence-disrupting mechanisms and an n-shaped sliding frame. The turbulence-disrupting mechanism includes a rotating shaft that rotates between the two sides of the conveyor box. A turbulence plate is fixedly connected to one side of the rotating shaft, and two symmetrical crossbars are fixedly connected to the other side of the rotating shaft. The sliding frame slides through the top of the conveyor box. Both ends of the bottom of the sliding frame are rotatably connected to connecting rods. The two connecting rods are rotatably connected to the two crossbars respectively. A spring is fixedly installed between the top of the conveyor box and the sliding frame through a spring seat.

[0018] Furthermore, a driven shaft is rotatably connected to one side of the bracket. One end of the driven shaft is connected to one end of the output shaft of the second motor via gear transmission. Multiple eccentric wheels are fixedly connected to the circumference of the driven shaft. The multiple eccentric wheels are located above and abut against multiple sliding frames.

[0019] Furthermore, a guide sleeve is fixedly connected to one end of the conveyor box near the collection car, and a through rod is inserted into the guide sleeve. A handle is fixedly connected to one side of the outer wall of the collection car. When the collection car is docked with the conveyor box, the through rod is manually inserted into the handle.

[0020] Furthermore, two limiting plates for guiding and limiting the material collection vehicle are fixedly connected to one end of the conveyor box near the material collection vehicle, and the ends of the limiting plates are inclined.

[0021] Furthermore, a top cover is fixedly connected to the top of the conveyor box, and the driven shaft is located inside the top cover.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. The rotary hearth furnace for processing lead-zinc smelting slag disclosed in this utility model utilizes a high-frequency oscillating baffle plate within the enclosed space of the conveyor box. This baffle plate continuously cuts the airflow, actively dispersing and peeling away the "thermal stagnation layer" adhering to the surface of the high-temperature slag, transforming the originally inefficient laminar heat transfer into intense turbulent heat transfer. This mechanism forces the rapid release of deep heat from the slag, significantly increasing the temperature and enthalpy of the airflow extracted by the blower. Consequently, the raw materials in the front-end feeding hopper can be preheated efficiently, greatly reducing the smelting energy consumption of the rotary hearth furnace.

[0024] 2. This utility model discloses a rotary hearth furnace for processing lead-zinc smelting slag, which constructs a directional negative pressure heat flow channel of "air intake in the collection car - heat absorption in the conveyor box - heat release in the feeding hopper". Through the tight connection achieved by the limiting plate and the insert rod, the collection car is transformed from a simple container into the system's "air intake damper". External cold air must pass through the first air vent of the collection car to rapidly cool the hottest slag material that has just fallen, and then it is further heated in the conveyor box. This counter-current heat exchange design eliminates the risk of "high core temperature" in the slag material and maximizes heat recovery efficiency.

[0025] 3. The rotary hearth furnace for processing lead-zinc smelting slag disclosed in this utility model utilizes the combination of perforated conveyor belt baffles and spiral feeding rollers to achieve "permeable" homogeneous conveying of the material layer. The perforated baffles allow turbulent hot air to penetrate the gaps in the material layer, and combined with the uniform distribution of the spiral rollers, it avoids localized overheating caused by slag accumulation, ensuring that slag particles of every size can be uniformly cooled and thermally extracted in the turbulent field.

[0026] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a first-view three-dimensional structural schematic diagram of a rotary hearth furnace for processing lead-zinc smelting slag proposed in this utility model.

[0029] Figure 2 This is a second-view three-dimensional structural diagram of a rotary hearth furnace for processing lead-zinc smelting slag proposed in this utility model.

[0030] Figure 3 This is a cross-sectional structural schematic diagram of a rotary hearth furnace for processing lead-zinc smelting slag according to the present invention.

[0031] Figure 4 This is a schematic diagram of the turbulence mechanism of a rotary hearth furnace for processing lead-zinc smelting slag, as proposed in this utility model.

[0032] Figure 5 This is a schematic diagram of the material collection car being pulled out of a rotary hearth furnace for processing lead-zinc smelting slag, as proposed in this utility model.

[0033] Figure 6 This is a schematic diagram of the heat exchange tube installation structure of a rotary hearth furnace for processing lead-zinc smelting slag, as proposed in this utility model.

[0034] In the diagram: 1. Furnace body; 2. Feed hopper; 3. Conveying box; 4. Collecting cart; 5. First air vent; 6. Second air vent; 7. Limiting plate; 8. First motor; 9. Fan; 10. Conveying roller; 11. Conveying belt; 12. Baffle; 13. Perforation; 14. Support; 15. Second motor; 16. Feeding roller; 17. Driven shaft; 18. Top cover; 19. Baffle mechanism; 20. Rotating shaft; 21. Baffle plate; 22. Crossbar; 23. Connecting rod; 24. Sliding frame; 25. Spring; 26. Eccentric wheel; 27. Guide sleeve; 28. Insert rod; 29. ​​Handle; 30. Heat exchange shell; 31. Heat exchange tube. Detailed Implementation

[0035] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] Reference Figure 1 A rotary hearth furnace for processing lead-zinc smelting slag includes a furnace body 1, a feeding hopper 2, a conveying box 3, and a collecting car 4. The feeding hopper 2 is located on one side of the furnace body 1, serving as a channel for raw materials to enter the furnace body 1. The furnace body 1, as the core area for smelting slag processing, is equipped with a distributor and a rotating furnace bottom. The distributor is located below the feeding hopper 2 to evenly distribute the input raw materials. The rotating furnace bottom is driven by an external drive mechanism to ensure that the raw materials can fully contact the heat source and complete the reduction reaction within the furnace body 1. A discharge port is located on one side of the furnace body 1, with its bottom flush with the furnace bottom, facilitating the smooth discharge of the processed raw materials.

[0037] Reference Figure 2-3 The conveyor box 3 is located on one side of the discharge port of the furnace body 1, and is used to receive and transfer the raw materials discharged from the furnace body 1. It is rotatably connected to the furnace body 1 through the feeding roller 16. The feeding roller 16 is horizontally mounted above the furnace bottom of the furnace body 1, and its two ends are rotatably connected to the side walls of the furnace body 1 and the conveyor box 3 respectively through bearing seats to ensure stable rotation. Spiral blades are welded and fixed to the circumferential surface of the feeding roller 16 for material discharge. A bracket 14 is welded and fixed to the outer wall of one side of the conveyor box 3, and a second motor 15 is bolted to the inner wall of its top. The circumference of the output shaft of the second motor 15 is connected to one end of the feeding roller 16 through a belt and pulley. The pulley is fixed to the output shaft of the second motor 15 and the end of the feeding roller 16 respectively through key connection. The second motor 15 drives the feeding roller 16 to rotate through the belt and pulley, and the spiral blades on the circumference of the feeding roller 16 push the raw materials for discharge.

[0038] In particular, the conveyor box 3 is equipped with a feeding mechanism for further conveying the raw materials entering the conveyor box 3. The feeding mechanism consists of two conveying rollers 10 and a first motor 8. The two conveying rollers 10 are parallel and horizontally arranged, rotatably connected between the two side walls of the conveyor box 3, and their ends are fixed to the side walls of the conveyor box 3 through bearing seats. The two conveying rollers 10 are set at different heights for easy receiving and unloading of materials. A conveyor belt 11 is connected between the two conveying rollers 10. Multiple evenly distributed baffles 12 are welded and fixed to the outer wall of the conveyor belt 11. The baffles 12 are perpendicular to the surface of the conveyor belt 11 to prevent the raw materials from slipping during the conveying process. Each baffle 12 has multiple through holes 13 on one side, which are arranged in a matrix to facilitate air passage through the baffle 12 for comprehensive heat dissipation of the raw materials. The first motor 8 is fixed to the outer wall of one side of the conveyor box 3 by bolts. One end of its output shaft is fixedly connected to the end of one of the conveying rollers 10 through a coupling. When the first motor 8 is started, it drives the conveyor belt 11 to rotate through the conveying rollers 10, thereby feeding the materials.

[0039] It should be noted that a heat exchange mechanism is installed inside the feeding hopper 2, such as... Figure 6This system is used to preheat the raw materials input, enabling energy recovery and utilization. The heat exchange mechanism includes a heat exchange shell 30 and a fan 9. The heat exchange shell 30 is made of welded steel plate, and its bottom surface is fixed to the bottom inner wall of the feeding hopper 2 by bolts, ensuring a tight fit with the inner wall of the feeding hopper 2 and preventing heat loss. A heat exchange tube 31, made of stainless steel, is welded and fixed to the top inner wall of the heat exchange shell 30. The heat exchange tube 31 is arranged in a serpentine bend inside the heat exchange shell 30, which increases the contact area between the heat exchange tube 31 and the air inside the heat exchange shell 30, improving heat exchange efficiency. Both ends of the heat exchange tube 31 extend through the side wall of the feeding hopper 2 to the outside. One end is fixedly connected to the side of the conveying box 3 near the furnace body 1 by a flange, and a sealing gasket is provided at the connection to prevent air leakage. The blower 9 is located on one side of the conveying box 3. Its exhaust end is fixedly connected to the other end of the heat exchange tube 31 through a pipe, and its exhaust end is connected to the external exhaust gas treatment equipment through a pipe to ensure that the air after heat exchange can be treated in compliance with regulations. When the air circulates, the raw material can be preheated when it passes above the heat exchange shell 30, reducing heat waste and saving energy.

[0040] In this utility model, the top of the conveyor box 3 is provided with multiple turbulence-disrupting mechanisms 19 and an n-shaped sliding frame 24, as shown in the reference. Figure 4 The airflow disturbance mechanism 19 is used to disrupt the airflow inside the conveyor box 3, improving the heat dissipation efficiency of the raw materials. Each airflow disturbance mechanism 19 includes a rotating shaft 20, which is horizontally rotatably connected between the two side walls of the conveyor box 3, and its two ends are fixed to the side walls of the conveyor box 3 by bearings. A baffle plate 21 is welded and fixed to one side of the rotating shaft 20. The baffle plate 21 is made of thin steel plate and is rectangular, which disturbs the air when it swings. Two symmetrical crossbars 22 are also welded and fixed to one side of the rotating shaft 20. The two crossbars 22 are located on both sides of the baffle plate 21 and are set perpendicular to the rotating shaft 20. The sliding frame 24 is made of round steel welded into an n-shaped structure. Its two ends slide through the through hole opened in the top of the conveyor box 3 and can slide up and down along the through hole. The two ends of the bottom of the sliding frame 24 are rotatably connected to the connecting rods 23 by pins. The other ends of the two connecting rods 23 are rotatably connected to the ends of the two crossbars 22 by pins, forming a linkage structure. A spring 25 is fixedly installed between the top of the conveyor box 3 and the sliding frame 24 via a spring seat. The spring 25 is sleeved on the vertical rod of the sliding frame 24. Its initial state is naturally extended, and it can provide a restoring force after the sliding frame 24 is pressed down.

[0041] Specifically, a driven shaft 17 is rotatably connected to one side of the support 14 via a bearing. The driven shaft 17 is parallel to the feed roller 16, and one end of it is connected to one end of the output shaft of the second motor 15 via gear transmission. The two gears are respectively keyed and fixed to the driven shaft 17 and the output shaft of the second motor 15, and mesh with each other. Multiple eccentric wheels 26 are welded and fixed to the circumferential surface of the driven shaft 17. The number of eccentric wheels 26 is the same as the number of sliding frames 24. The multiple eccentric wheels 26 are located above the multiple sliding frames 24, and their outer circumferential surfaces contact and abut against the top of the sliding frames 24. When the eccentric wheels 26 rotate, they can push the sliding frames 24 to move up and down reciprocally. A top cover 18 is welded and fixed to the top of the conveyor box 3. The top cover 18 is made of steel plate and completely covers the top of the driven shaft 17, eccentric wheels 26 and sliding frames 24, providing dust protection and protection. The two ends of the driven shaft 17 are rotatably connected to the side wall of the top cover 18 via bearings to ensure smooth rotation.

[0042] It should be noted that the end of the conveyor box 3 furthest from the furnace body 1 has a discharge port, and the collecting cart 4 is located on one side of this discharge port to collect the processed raw materials, such as... Figure 5 The collection cart 4 abuts against the discharge port of the conveyor box 3, with its top opening completely fitting the discharge port of the conveyor box 3 to seal it and prevent air leakage. Multiple through-holes 5 are provided on one side of the collection cart 4. These first air holes 5 are circular and evenly distributed on the side wall of the collection cart 4 away from the conveyor box 3, facilitating the entry of external air into the conveyor box 3. Multiple second air holes 6 are provided on the top of the conveyor box 3. These second air holes 6 have the same structure as the first air holes 5 and are used to replenish air. Two limiting plates 7 are welded and fixed to one end of the conveyor box 3 near the collection cart 4. These two limiting plates 7 are located on both sides of the collection cart 4, guiding and limiting its movement. Their ends are inclined to facilitate quick docking of the collection cart 4.

[0043] In this invention, a guide sleeve 27 is welded and fixed to one end of the conveyor box 3 near the collecting cart 4. A through rod 28 is inserted into the guide sleeve 27. The rod 28 is made of round steel and can slide freely along the guide sleeve 27. A handle 29 is welded and fixed to one side of the outer wall of the collecting cart 4. The handle 29 has a hole for engaging the rod 28. When the collecting cart 4 is aligned with the conveyor box 3, the rod 28 can be manually inserted into the hole of the handle 29 to fix the collecting cart 4.

[0044] Working principle: During use, the processed raw materials are fed into the material distributor inside the furnace body 1 through the feeding hopper 2, and then fall evenly onto the rotating furnace bottom at the bottom of the furnace body 1. After being heated and reduced by gas, the raw materials are transferred to the discharge port of the furnace body 1. The blower 9, the first motor 8 and the second motor 15 are started. The second motor 15 drives the feeding roller 16 to rotate through the belt pulley. The spiral blades on the circumference of the feeding roller 16 cause the processed raw materials to fall onto the conveyor belt 11 for conveying (at this time, the second motor 15 drives the feeding roller 16 to rotate, and its spiral blades not only play a conveying role, but also break up the clumps of high-temperature slag and spread them evenly on the conveyor belt 11 to avoid the material layer being too thick and affecting the internal heat dissipation).

[0045] The blower 9 draws air from the conveyor box 3 through the heat exchange tube 31. The air enters through the first air hole 5 and the second air hole 6. The air entering through the first air hole 5 can blow towards the raw material, thereby providing final heat dissipation for the falling finished product (this cold airflow first impacts the hottest material that has just fallen into the collection car, completing the first stage of "quenching" heat exchange). The air entering the conveyor box 3 through the second air hole 6 can directly blow towards the finished product on the surface of the conveyor belt 11, cooling it down. When the hot air passes through the heat exchange tube 31, it can heat the inside of the heat exchange shell 30. When the raw material passes over the heat exchange shell 30, it can be preheated, reducing heat waste and saving energy.

[0046] When the second motor 15 starts, it drives the driven shaft 17 to rotate through two meshing gears. The driven shaft 17 drives the eccentric wheel 26 to rotate. The eccentric wheel 26 reciprocates and presses down on the sliding frame 24. The sliding frame 24 pushes the rotating shaft 20 to rotate through the connecting rod 23 and the crossbar 22. The rotating shaft 20 drives the baffle 21 to swing, disturbing the air inside the conveyor box 3 and improving the heat dissipation efficiency of the finished product. (The second motor 15 drives the driven shaft 17 to rotate at high speed through gear transmission. The eccentric wheel 26 on it continuously impacts and drives the sliding frame 24 to move up and down. This mechanical action is converted into the continuous fanning of the baffle 21 above the conveyor belt through the connecting rod 23. The fanning of the baffle 21 artificially creates strong air turbulence, like "fanning" to continuously peel off the high-temperature air film (boundary layer) on the surface of the slag, forcing fresh cold air to come into direct contact with the surface of the slag. This active turbulent heat exchange allows the air to quickly absorb the high-grade heat energy of the slag and become high-temperature hot air.)

[0047] The collection car 4 is connected to the conveyor box 3, allowing air to enter the conveyor box 3 in a directional manner, reducing heat loss and improving the recovery rate. After collection, the collection car 4 can be transferred or replaced by pulling out the plug rod 28.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rotary hearth furnace for treating lead-zinc smelting residues, characterized in that, include: A furnace body (1) and a feeding hopper (2) set on one side of the furnace body (1). A discharge port is set on one side of the furnace body (1), and a conveying box (3) for transferring materials is set on one side of the discharge port. A feeding roller (16) is rotatably connected between the conveying box (3) and the furnace body (1). The feeding roller (16) is located above the furnace bottom of the furnace body (1), and a spiral blade is fixed on the circumference of the feeding roller (16). The conveying box (3) is provided with a discharge port at one end away from the furnace body (1). A collection car (4) is provided on one side of the discharge port. The collection car (4) blocks the discharge port by contacting the discharge port of the conveying box (3). Multiple through first air holes (5) are opened on one side of the collection car (4). Multiple second air holes (6) are provided on the top of the conveying box (3). A bracket (14) is fixedly connected to one side of the outer wall of the conveying box (3), and a second motor (15) is fixedly connected to the top inner wall of the bracket (14). The circumference of the output shaft of the second motor (15) is connected to one end of the feeding roller (16) through a belt pulley. A feeding mechanism is installed inside the conveyor box (3) for conveying raw materials; A heat exchange mechanism is installed in the feeding hopper (2) for preheating the incoming material.

2. A rotary hearth furnace for treating lead and zinc smelting residues according to claim 1, characterized in that, The feeding mechanism includes two conveying rollers (10) and a first motor (8). The conveying rollers (10) are rotatably connected between the two sides of the conveying box (3). A conveyor belt (11) is connected between the two conveying rollers (10). Multiple evenly distributed baffles (12) are fixedly connected to the outer wall of the conveyor belt (11). The first motor (8) is fixed to one side of the outer wall of the conveying box (3). One end of the output shaft of the first motor (8) is fixed to one of the conveying rollers (10).

3. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 2, characterized in that, Each side of the baffle (12) is provided with a through hole (13).

4. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 1, characterized in that, The heat exchange mechanism includes a heat exchange shell (30) and a fan (9). The heat exchange shell (30) is fixed on the bottom surface of the feeding hopper (2). A heat exchange tube (31) is fixedly connected to the top inner wall of the heat exchange shell (30). The heat exchange tube (31) is serpentine and both ends pass through the feeding hopper (2). One end of the heat exchange tube (31) is fixedly connected to the side of the conveying box (3) near the furnace body (1). The fan (9) is set on one side of the conveying box (3). The other end of the heat exchange tube (31) is fixedly connected to the exhaust end of the fan (9). The exhaust end of the fan (9) is connected to the external waste gas treatment equipment through a pipeline.

5. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 4, characterized in that, The top of the conveyor box (3) is provided with multiple turbulence mechanisms (19) and an n-shaped sliding frame (24). The turbulence mechanism (19) includes a rotating shaft (20), which rotates between the two sides of the conveyor box (3). A turbulence plate (21) is fixedly connected to one side of the rotating shaft (20), and two symmetrical crossbars (22) are fixedly connected to one side of the rotating shaft (20). The sliding frame (24) slides through the top of the conveyor box (3). Both ends of the bottom of the sliding frame (24) are rotatably connected to connecting rods (23). The two connecting rods (23) are rotatably connected to the two crossbars (22) respectively. A spring (25) is fixedly installed between the top of the conveyor box (3) and the sliding frame (24) through a spring seat.

6. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 4, characterized in that, One side of the bracket (14) is rotatably connected to a through driven shaft (17). One end of the driven shaft (17) is connected to one end of the output shaft of the second motor (15) via gear transmission. Multiple eccentric wheels (26) are fixedly connected to the circumference of the driven shaft (17). The multiple eccentric wheels (26) are located above and in contact with multiple sliding frames (24).

7. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 1, characterized in that, The conveyor box (3) is fixedly connected to a guide sleeve (27) at one end near the collection car (4). A through rod (28) is inserted into the guide sleeve (27). A handle (29) is fixedly connected to one side of the outer wall of the collection car (4). When the collection car (4) is connected to the conveyor box (3), the rod (28) is manually inserted into the handle (29).

8. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 1, characterized in that, The conveyor box (3) is fixedly connected to two limiting plates (7) for guiding and limiting the material collection vehicle (4) at one end, and the ends of the limiting plates (7) are inclined.

9. A rotary hearth furnace for processing lead-zinc smelting slag according to claim 6, characterized in that, The top of the conveyor box (3) is fixedly connected to a top cover (18), and the driven shaft (17) is located inside the top cover (18).

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