Double-chamber molybdenum oxide rotary kiln with preheating function

Abstract

The invention relates to the technical field of rotary kilns, and discloses a double-chamber molybdenum oxide rotary kiln with a preheating function, the double-chamber molybdenum oxide rotary kiln comprises a bottom plate and a rotary kiln body mounted at the top of the bottom plate, the rotary kiln body comprises a rotating cylinder, a fixed cylinder, a kiln tail cover and a kiln head cover, and the kiln head cover and the kiln tail cover are mounted at the two ends of the top of the bottom plate correspondingly; the fixed cylinder used for preheating is fixedly connected to one end of the kiln head cover, the rotating cylinder is rotationally connected between the fixed cylinder and the kiln tail cover, a gear ring is fixedly connected to the middle of the outer wall of the rotating cylinder, and a driving motor is fixedly connected to the top of the rotating cylinder. By arranging the reaction box, the weighing assembly and the control assembly, the resistance value connected into the driving motor circuit can be adjusted according to the weight of ammonium sulfite solids generated by the reaction of sulfur dioxide and ammonia water in unit time, so that the rotating speed of the driving motor can be adjusted according to the concentration of sulfur dioxide to adapt to different roasting stages, and the adjustment is more accurate.

Description

Technical Field

[0001] This invention relates to the field of rotary kiln technology, specifically a dual-chamber rotary kiln for molybdenum oxide with preheating function. Background Technology

[0002] In the processing and production of molybdenum oxide, the rotary kiln is one of the most important core equipment. It can perform carbon-free roasting of the prepared molybdenum concentrate in the rotary kiln and discharge the finished molybdenum oxide product. The rotary kiln is mainly composed of kiln head, kiln body, kiln tail and support wheels, etc., and completes production tasks such as feeding, roasting and discharging.

[0003] However, in the current molybdenum oxide roasting process, the rotary kiln's speed control suffers from significant process adaptation deficiencies. Because molybdenum concentrate undergoes different reaction stages during roasting, such as dehydration, oxidation, and desulfurization, the requirements for material mixing degree, heat transfer efficiency, and residence time differ significantly at each stage. However, current equipment lacks an automated speed adjustment mechanism based on process parameters, relying on manual adjustments by operators based on experience, which affects the accuracy of speed adjustment. Therefore, this invention provides a dual-chamber rotary kiln for molybdenum oxide with preheating function to solve the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-chamber rotary kiln for molybdenum oxide with a preheating function, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A dual-chamber rotary kiln for molybdenum oxide with preheating function includes a base plate and a rotary kiln body mounted on top of the base plate. The rotary kiln body includes a rotating cylinder, a fixed cylinder, a kiln tail hood, and a kiln head hood. The kiln head hood and kiln tail hood are respectively mounted at both ends of the top of the base plate. The fixed cylinder for preheating is fixedly connected to one end of the kiln head hood. The rotating cylinder is rotatably connected between the fixed cylinder and the kiln tail hood, and a gear ring is fixedly connected to the middle of the outer wall of the rotating cylinder. A drive motor is fixedly connected to the top of the rotating cylinder, and a transmission gear is rotatably connected to the output end of the drive motor. The transmission gear meshes with the gear ring. A heat exchange cylinder is installed on one side of the kiln tail hood. A heat exchange component is installed inside the heat exchange cylinder to recover heat from the exhaust gas generated during processing inside the rotating cylinder. A hot gas pipe connected to a fixed cylinder is installed at the tail end of the heat exchange cylinder. A control box is installed at the top of the kiln tail cover. A reaction chamber for reacting the exhaust gas is installed on one side of the inner wall of the control box. The reaction chamber is connected to the heat exchange cylinder through a return gas pipe. A weighing component for weighing the reactants in the reaction chamber is installed in the middle of the inner wall of the control box. A feeding hood for the reactants to pass through is connected between the reaction chamber and the weighing component. A control component for adjusting the output power of the drive motor is installed on the other side of the inner wall of the control box. A gas conveying pipe is installed between the weighing component and the control component.

[0006] As a further embodiment of the present invention, the heat exchange assembly includes a heat exchange tube and a return pipe. An exhaust groove is provided on the side of the kiln tail hood near the rotating cylinder. An exhaust pipe is connected to one end of the exhaust groove away from the rotating cylinder. The other end of the exhaust pipe is connected to the inner wall of the heat exchange cylinder. The heat exchange tube is spirally installed on the inner wall of the heat exchange cylinder and connected to the exhaust pipe. One end of the return pipe is connected to the tail end of the heat exchange tube, and the other end of the return pipe is connected to the return gas pipe. An air inlet pipe for air intake is installed at the top of the heat exchange cylinder.

[0007] As a further embodiment of the present invention, a partition is installed on the inner wall of the reaction chamber, a first motor is installed on the top of the partition, a lead screw is installed at the output end of the first motor, a filter plate is slidably connected to the inner wall of the reaction chamber, the filter plate is threaded to the outer wall of the lead screw, a slot is opened on the side wall of the reaction chamber to communicate with the feeding hood, a chimney pipe for exhaust is connected to the top of the control box, an exhaust pipe is connected between the reaction chamber and the chimney pipe, and the connection between the exhaust pipe and the reaction chamber is located at the bottom of the partition.

[0008] As a further embodiment of the present invention, a sealing plate is installed at the groove of the reaction chamber, a guide rod is slidably connected to the inner wall of the sealing plate, a fixing plate is fixedly connected to the top of the guide rod, the fixing plate is installed on the inner wall of the reaction chamber by bolts, and a first connecting rod is fixedly connected to the bottom of the sealing plate, and a pressure plate is fixedly connected to the bottom of the first connecting rod.

[0009] As a further embodiment of the present invention, the weighing assembly includes a fixed plate, a second motor, and a rotating plate. The second motor is fixedly connected to the inner wall of one side of the control box, and a connecting shaft is installed at the output end of the second motor. The rotating plate is fixedly connected to the outer wall of the connecting shaft. The fixed plate is installed at the tail end of the feeding hood. A fixing sleeve is installed at the end of the fixed plate near the rotating plate. The top and bottom of the outer wall of the rotating plate are provided with through-feed grooves. The material dropping groove at the top is connected to the bottom end of the feeding hood.

[0010] As a further embodiment of the present invention, the weighing assembly further includes a weighing plate and a first piston plate. An air cavity is formed in the inner wall of the fixed sleeve. The first piston plate is slidably connected to the inner wall of the air cavity. One end of the conveying pipe is connected to the inner wall of the air cavity. A second connecting rod is fixedly connected to the top of the first piston plate. The weighing plate is fixedly connected to the top of the second connecting rod. A second spring is fixedly connected between the first piston plate and the air cavity.

[0011] As a further embodiment of the present invention, a door is rotatably connected to one side of the outer wall of the control box, and a collection box is slidably connected to the bottom inner wall of the control box, the collection box being located at the bottom of the material drop chute.

[0012] As a further embodiment of the present invention, the control component includes a base, a top frame, and a sliding seat. The base is installed on one side of the inner wall of the bottom of the control box. The top frame is fixedly connected to the top of the base. The sliding seat is fixedly connected to the inner wall of the top frame. Sliding sleeves are slidably connected to both sides of the inner wall of the sliding seat. A negative electrode and a positive electrode are fixedly connected to opposite ends of the sliding sleeves on both sides, respectively. The negative electrode and the positive electrode are connected in series with the drive motor in the same circuit.

[0013] As a further embodiment of the present invention, a third spring is fixedly connected between the two sliding sleeves, and the inner walls of the two sliding sleeves at both ends are slidably connected to the same sliding tube.

[0014] As a further embodiment of the present invention, the control assembly further includes a second piston plate, an extrusion block, and a pressure-bearing block. The second piston plate is slidably connected to the inner wall of the base, and the other end of the conveying pipe is connected to the inner wall of the base. A third connecting rod is fixedly connected to the top of the second piston plate. The third connecting rod is slidably connected to the inner wall of the top frame and the sliding seat. The extrusion block is fixedly connected to the top of the third connecting rod, and the pressure-bearing block is fixedly connected to the bottom position on the opposite side of the sliding sleeve. The pressure-bearing block is in contact with the extrusion block.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. When using this invention, the resistance value connected to the drive motor circuit can be adjusted according to the weight of the ammonium sulfite solid produced by the reaction of sulfur dioxide and ammonia water per unit time through the set reaction chamber, weighing component and control component. In this way, the speed of the drive motor can be adjusted according to the concentration of sulfur dioxide to adapt to different roasting stages and the adjustment is more accurate.

[0016] 2. When using this invention, the heat exchange cylinder can transfer the heat in the exhaust gas to the fixed cylinder to preheat the raw materials, improve the efficiency of the raw material roasting, recover the waste heat, reduce energy consumption, and cool down the exhaust gas to avoid the temperature being too high and affecting the reaction between sulfur dioxide and ammonia water, thereby affecting the treatment effect of sulfur dioxide gas.

[0017] 3. When using this invention, the sulfur dioxide in the exhaust gas can be treated by the weighing components, collection box and reaction box, and the ammonium sulfite solid generated by the reaction can be collected and used as fertilizer through subsequent treatment, thereby improving the utilization rate of resources.

[0018] 4. When using this invention, the sealing plate can seal the slot connecting the reaction tank and the feeding hood when sulfur dioxide and ammonia react, preventing sulfur dioxide and ammonia from being fully reacted and drifting into the control box, thus avoiding any impact on the health of the staff when the chimney pipe is opened. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0020] Figure 2 This is a schematic diagram of the structure of the rotating cylinder and the fixed cylinder in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0021] Figure 3 This is a cross-sectional view of the kiln tail hood in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0022] Figure 4 This is a cross-sectional view of the heat exchanger in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0023] Figure 5 This is a schematic diagram of the control box in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0024] Figure 6 This is a cross-sectional view of the control box in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0025] Figure 7 This is a cross-sectional view of the reaction chamber in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0026] Figure 8 This is a schematic diagram of the sealing plate in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0027] Figure 9 This is a cross-sectional view of a weighing assembly in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0028] Figure 10 An exploded view of a weighing assembly in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0029] Figure 11 For a dual-chamber rotary kiln with preheating function for molybdenum oxide Figure 10 Enlarged view of part A.

[0030] Figure 12 This is a schematic diagram of the control components in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0031] Figure 13 An exploded view of the control components in a dual-chamber rotary kiln for molybdenum oxide with preheating function.

[0032] In the diagram: 100, bottom plate; 110, rotating cylinder; 111, drive motor; 112, transmission gear; 113, gear ring; 120, fixed cylinder; 130, kiln tail hood; 131, exhaust chute; 132, exhaust pipe; 133, heat insulation plate; 134, return gas pipe; 140, kiln head hood; 200. Heat exchanger cylinder; 201. Mounting bracket; 210. Inlet pipe; 211. Hot air pipe; 220. Heat exchanger tube; 221. Return pipe; 300. Control box; 301. Box door; 310. Chimney pipe; 320. Collection box; 400. Reaction chamber; 401. Liquid inlet pipe; 402. Baffle plate; 410. Feed hood; 411. Mounting frame; 420. Discharge pipe; 430. First motor; 431. Lead screw; 432. Filter plate; 440. Sealing plate; 441. Fixing plate; 442. Guide rod; 443. First spring; 444. First connecting rod; 445. Pressure plate; 500, Fixed plate; 501, Fixed sleeve; 502, Air chamber; 503, Weighing plate; 504, Second connecting rod; 505, First piston plate; 506, Second spring; 510, Conveying pipe; 520, Second motor; 521, Connecting shaft; 522, Rotating plate; 523, Material discharge chute; 600, base; 601, second piston plate; 602, third connecting rod; 603, pressing block; 610, top frame; 620, sliding seat; 621, sliding sleeve; 633, negative electrode; 623, positive electrode; 624, pressure block; 625, sliding tube; 626, third spring. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1 and Figure 2 In this embodiment of the invention, a dual-chamber rotary kiln for molybdenum oxide with preheating function includes a bottom plate 100 and a rotary kiln body installed on top of the bottom plate 100. The rotary kiln body includes a rotating cylinder 110, a fixed cylinder 120, a kiln tail hood 130, and a kiln head hood 140. The kiln head hood 140 and the kiln tail hood 130 are respectively installed at both ends of the top of the bottom plate 100. A feed inlet is provided at the top of the kiln head hood 140. The fixed cylinder 120 for preheating is fixedly connected to one end of the kiln head hood 140 and communicates with the feed inlet on the kiln head hood 140. The rotating cylinder 110 is rotatably connected between the fixed cylinder 120 and the kiln tail hood 130. A burner for heating (the burner is prior art and will not be described in detail here) is installed inside the rotating cylinder 110. Rotating rings are fixedly connected to both ends of the outer wall of the rotating cylinder 110. Frame plates are fixedly connected to both ends and the middle of the top of the bottom plate 100. Both ends of the top are rotatably connected to support rollers, which are in contact with the rotating ring. A gear ring 113 is fixedly connected to the middle of the outer wall of the rotating cylinder 110. A drive motor 111 is fixedly connected to the top of the frame plate in the middle of the rotating cylinder 110. A rotating shaft is installed at the output end of the drive motor 111. A transmission gear 112 is fixedly connected to the outer wall of the rotating shaft. The transmission gear 112 meshes with the gear ring 113. When raw materials need to be processed, the raw materials are added into the fixed cylinder 120 through the feed port on the kiln head cover 140 for preheating. After preheating, the raw materials are transported into the rotating cylinder 110 and heated by the internal burner. At this time, the drive motor 111 is turned on. The drive motor 111 can drive the transmission gear 112 to rotate through the rotating shaft. The rotation of the transmission gear 112 can drive the meshing gear ring 113 to rotate, and then drive the rotating cylinder 110 to rotate to process the raw materials. See Figure 4A heat exchange cylinder 200 is installed on one side of the kiln tail hood 130. Mounting brackets 201 are installed at both ends of the outer wall of the heat exchange cylinder 200. The mounting brackets 201 at both ends are respectively installed on the side wall of the kiln tail hood 130 and the frame plate on the top of the bottom plate 100 by bolts. A heat exchange component for recovering heat from the exhaust gas generated in the rotating cylinder 110 is installed inside the heat exchange cylinder 200. The medium of the heat exchange component is air. A hot air pipe 211 connected to the fixed cylinder 120 is installed at the tail end of the heat exchange cylinder 200. The heat exchange component uses the heat in the exhaust gas to heat the air inside the heat exchange cylinder 200. The heated air can then be transported to the fixed cylinder 120 through the hot air pipe 211 to preheat the raw materials. See Figure 5 and Figure 6 A control box 300 is installed at the top of the kiln tail hood 130. The top of the control box 300 is connected to a chimney pipe 310 for exhaust. A reaction box 400 for reacting with the exhaust gas is installed on one side of the inner wall of the control box 300. An exhaust pipe 420 is connected between the reaction box 400 and the chimney pipe 310. The reaction box 400 is connected to the heat exchange cylinder 200 through a return gas pipe 134. After the heat exchange is completed, the exhaust gas can be transported to the inner wall of the reaction box 400 through the return gas pipe 134. The reaction box 400 reacts with the sulfur dioxide gas in the exhaust gas to remove it. The treated gas is discharged through the exhaust pipe 420 and from the chimney pipe 310. A weighing component for weighing the reactants in the reaction chamber 400 is installed in the middle of the inner wall of the control box 300. A feeding hood 410 for the reactants to pass through is connected between the reaction chamber 400 and the weighing component. A control component for adjusting the output power of the drive motor 111 is installed on the other side of the inner wall of the control box 300. A gas conveying pipe 510 is installed between the weighing component and the control component. The reactants produced in the reaction chamber 400 can pass through the feeding hood 410 and enter the weighing component for weighing. The weighing component conveys the weighed reactant weight to the control component through the conveying pipe 510 by air pressure. The control component generates different resistance values ​​according to the change of air pressure. The change of resistance at the drive motor 111 adjusts the current, thereby adjusting the output power at the drive motor 111.

[0035] See Figure 3 and Figure 4The heat exchange assembly includes a heat exchange tube 220 and a return pipe 221. An exhaust trough 131 is provided on the side of the kiln tail hood 130 near the rotating cylinder 110. An exhaust pipe 132 is connected to one end of the exhaust trough 131 away from the rotating cylinder 110, and the other end of the exhaust pipe 132 is connected to the inner wall of the heat exchange cylinder 200. The heat exchange tube 220 is spirally installed on the inner wall of the heat exchange cylinder 200 and connected to the exhaust pipe 132. The heat exchange tube 220 is made of copper. One end of the return pipe 221 is connected to the tail end of the heat exchange tube 220, and the other end is connected to the return gas pipe 134. An air inlet pipe 210 for air intake is installed at the top of the heat exchange cylinder 200, and a suction device is installed at the air inlet pipe 210. An air pump (not shown in the diagram) draws outside air into the heat exchange cylinder 200 through the inlet pipe 210. When exhaust gas is generated during processing inside the rotating cylinder 110, the exhaust gas passes through the exhaust groove 131 and the exhaust pipe 132 and enters the inner wall of the heat exchange tube 220. The exhaust gas circulates within the heat exchange tube 220. The air enters the heat exchange cylinder 200 through the inlet pipe 210, and the heat from the exhaust gas heats the air inside the heat exchange cylinder 200 through the heat exchange tube 220. The heated air then enters the fixed cylinder 120 through the hot gas pipe 211 to preheat the raw materials. The exhaust gas, after heat exchange, is then transported to the reaction chamber 400 through the return pipe 221 and the return gas pipe 134 for reaction.

[0036] More specifically, the kiln tail hood 130 has an L-shaped fixing hole at the top of the exhaust trough 131. The return gas pipe 134 is fixedly connected to the inner wall of the fixing hole. A cavity is opened at the fixing hole, and the cavity is located at the top of the exhaust trough 131. A heat insulation plate 133 is installed at the bottom of the cavity. Specifically, when the exhaust gas after heat exchange is completed is transported through the return gas pipe 134, the heat insulation plate 133 can insulate the exhaust gas passing through the exhaust trough 131, so as to avoid heating the exhaust gas after heat exchange, which would cause the exhaust gas temperature to rise too quickly and affect the reaction.

[0037] See Figure 7A partition plate 402 is installed on the inner wall of the reaction chamber 400. A liquid inlet pipe 401 for feeding is installed at the bottom of the partition plate 402. The connection point between the return gas pipe 134 and the reaction chamber 400 is located at the bottom of the inner wall. A first motor 430 is installed on the top of the partition plate 402, and a lead screw 431 is installed at the output end of the first motor 430. A filter plate 432 is slidably connected to the inner wall of the reaction chamber 400. Multiple filter holes arranged in a matrix are opened on the top of the filter plate 432. The filter plate 432 is threaded to the outer wall of the lead screw 431. A slot communicating with the feeding hood 410 is opened on the side wall of the reaction chamber 400. The filter plate 432 is... The filter plate 432 is inclined with its slope pointing towards the slot. The connection between the discharge pipe 420 and the reaction chamber 400 is located at the bottom of the partition plate 402. When the exhaust gas after heat exchange is completed enters the reaction chamber 400, the sulfur dioxide in the exhaust gas can react with ammonia water to generate ammonium sulfite solid, which falls to the top of the filter plate 432. The first motor 430 is turned on at regular intervals. The first motor 430 starts and drives the lead screw 431 to rotate. The lead screw 431 drives the threaded filter plate 432 to slide in the reaction chamber 400, bringing the ammonium sulfite solid to the top. Ammonia water is filtered out from the filter holes, and the ammonium sulfite solid passes through the slot along the slope of the filter plate 432 and enters the inner wall of the feeding hood 410 for conveying.

[0038] See Figure 8 A sealing plate 440 is installed at the slot of the reaction chamber 400. Multiple through sliding holes are formed at the top of the sealing plate 440. Guide rods 442 are slidably connected to the inner walls of the sliding holes. A fixing plate 441 is fixedly connected to the top of the guide rods 442. The fixing plate 441 is bolted to the inner wall of the reaction chamber 400. A first spring 443 is installed between the fixing plate 441 and the sealing plate 440. The first spring 443 is sleeved on the outer wall of the guide rods 442. A first connecting rod 444 is fixedly connected to the bottom of the sealing plate 440. A pressure plate is fixedly connected to the bottom of the first connecting rod 444. 445. When the filter plate 432 moves upward, it can squeeze the pressure plate 445, causing the first connecting rod 444 and the sealing plate 440 to move upward out of the slot, releasing the blockage of the slot, and the reactants can pass through the slot into the feeding hood 410. When the filter plate 432 moves downward, the pressure plate 445 is no longer squeezed, and under the elastic force of the first spring 443, the sealing plate 440 can be reset to seal the slot. Then, when the filter plate 432 does not convey reactants, the slot is sealed to prevent the leakage of sulfur dioxide gas during the reaction and the resulting danger.

[0039] See Figure 9 , Figure 10 and Figure 11The weighing assembly includes a fixed plate 500, a second motor 520, and a rotating plate 522. The second motor 520 is fixedly connected to the inner wall of one side of the control box 300. A connecting shaft 521 is installed at the output end of the second motor 520. The rotating plate 522 is fixedly connected to the outer wall of the connecting shaft 521. The fixed plate 500 is installed at the tail end of the feeding hood 410. A mounting bracket 411 is bolted to the side wall of the tail end of the feeding hood 410. The bottom end of the mounting bracket 411 is annular and is bolted to one end of the fixed plate 500. A fixed sleeve 501 is installed near one end of the rotating disk 522, and a through-feed groove 523 is provided on the top and bottom of the outer wall of the rotating disk 522. The top feed groove 523 is connected to the bottom of the feeding hood 410. The reactants can fall into the feed groove 523 after passing through the feeding hood 410. When the weighing is completed and the material needs to be discharged, the second motor 520 is started. The second motor 520 can drive the rotating disk 522 to rotate through the connecting shaft 521, and the reactants in the top feed groove 523 can be rotated to the bottom for discharge.

[0040] The weighing assembly also includes a weighing plate 503 and a first piston plate 505. An air chamber 502 is formed on the inner wall of the fixed sleeve 501. The air chamber 502 and the material discharge chute 523 are located on the same axis. The first piston plate 505 is slidably connected to the inner wall of the air chamber 502. One end of the conveying pipe 510 is connected to the inner wall of the air chamber 502, and the connection point is located at the bottom of the first piston plate 505. A second connecting rod 504 is fixedly connected to the top of the first piston plate 505. The weighing plate 503 is fixedly connected to the top of the second connecting rod 504. The weighing plate 503 is located inside the material discharge chute 523. The first piston plate 505 and the air chamber 502 are slidably connected to the first piston plate 505. A second spring 506 is fixedly connected between the cavities 502. The second spring 506 is sleeved on the outer wall of the second connecting rod 504. When the reactant passes through the top discharge chute 523, it falls into the top of the weighing plate 503. The weighing plate 503 is squeezed and the pressure is transmitted to the second spring 506 through the second connecting rod 504 and the first piston plate 505. The second spring 506 is stretched by the force, which can drive the weighing plate 503 and the first piston plate 505 to move down. The first piston plate 505 moves down and squeezes the gas at the bottom of the gas cavity 502. The squeezed gas can then enter the conveying pipe 510 for transportation.

[0041] See Figure 5 and Figure 6A door 301 is rotatably connected to one side of the outer wall of the control box 300. A handle for pulling is installed on one side of the outer wall of the door 301, and an observation window is installed on the other side of the outer wall of the door 301. A scale is opened on the observation window. The reaction box 400 is made of glass and is located on the side of the control box 300 near the observation window. The ammonia water inside the reaction box 400 can be observed through the scale on the observation window. A limit groove is opened on the inner wall of the bottom of the control box 300. A limit slider is slidably connected to the inner wall of the limit groove. A collection box 320 is fixedly connected to the top of the limit slider. The collection box 320 is located at the bottom of the discharge chute 523. The reactants fall into the collection box 320 after falling through the discharge chute 523. Pulling the handle on the door 301 will rotate and open it, allowing the collection box 320 to be pulled out and the reactants to be discharged.

[0042] See Figure 12 and Figure 13 The control assembly includes a base 600, a top frame 610, and a sliding seat 620. The base 600 is installed on one side of the bottom inner wall of the control box 300. The top frame 610 is fixedly connected to the top of the base 600. The top of the top frame 610 has a mounting groove with a semi-circular cross-section. The sliding seat 620 is fixedly connected to the inner wall of the mounting groove on the top frame 610. Sliding sleeves 621 are slidably connected to both sides of the inner wall of the sliding seat 620. A negative electrode 633 and a positive electrode 623 are fixedly connected to opposite ends of the sliding sleeves 621, respectively. Electrode 633 and positive electrode 623 are connected in series with drive motor 111 in the same circuit. When sliding sleeve 621 slides in sliding seat 620, the distance between negative electrode 633 and positive electrode 623 can be adjusted. When the distance between negative electrode 633 and positive electrode 623 changes, the resistance between them changes. Then the resistance in the circuit connected to drive motor 111 changes, which can adjust the current on drive motor 111. In turn, the output power of drive motor 111 is adjusted to change the speed of driving rotating cylinder 110 to rotate.

[0043] A third spring 626 is fixedly connected between the two sliding sleeves 621, and the inner walls of the two sliding sleeves 621 at both ends are slidably connected to the same sliding tube 625. The sliding tube 625 is a hollow structure, and the sliding sleeves 621 and the sliding tube 625 are filled with electrolyte solution. The negative electrode 633 and the positive electrode 623 can form a closed circuit through the electrolyte solution in the sliding sleeves 621 and the sliding tube 625.

[0044] The control assembly also includes a second piston plate 601, a pressing block 603, and a pressure-bearing block 624. The second piston plate 601 is slidably connected to the inner wall of the base 600. The other end of the conveying pipe 510 is connected to the inner wall of the base 600, and the connection point is located at the bottom of the second piston plate 601. A third connecting rod 602 is fixedly connected to the top of the second piston plate 601. The third connecting rod 602 is slidably connected to the inner wall of the top frame 610 and the sliding seat 620. The pressing block 603 is fixedly connected to the top of the third connecting rod 602. The pressing block 603 is frustoconical in shape. The pressure-bearing block 624 is fixedly connected to the bottom position on the opposite side of the sliding sleeve 621. The pressure block 624 is inclined and in contact with the extrusion block 603. When the gas is delivered to the inner wall of the base 600 through the delivery pipe 510, the second piston plate 601 is squeezed upward by the gas. The second piston plate 601 drives the extrusion block 603 to move upward through the third connecting rod 602 to squeeze the pressure block 624. The pressure block 624 is squeezed and drives the sliding sleeve 621 to slide in the sliding seat 620, so that the distance between the negative electrode 633 and the positive electrode 623 can be adjusted. When the extrusion block 603 moves downward with the second piston plate 601, the sliding sleeve 621 is reset under the action of the elastic force of the third spring 626.

[0045] The working principle of this invention is as follows: When raw materials need to be processed, the raw materials are added into the fixed cylinder 120 through the kiln head hood 140. After being preheated in the fixed cylinder 120, they enter the rotating cylinder 110 for processing. The drive motor 111 is turned on, and the drive motor 111 drives the meshing gear ring 113 to rotate through the transmission gear 112. The gear ring 113 drives the rotating cylinder 110 to rotate, and the raw materials rotate while being roasted in the rotating cylinder 110. The exhaust gas generated during the roasting of raw materials can pass through the exhaust groove 131 and exhaust pipe 132 into the heat exchange tube 220 inside the heat exchange cylinder 200. The air pump draws external air into the heat exchange cylinder 200 through the air inlet pipe 210. The exhaust gas in the heat exchange tube 220 heats the air inside the heat exchange cylinder 200. The heated air enters the fixed cylinder 120 through the hot air pipe 211 to preheat the raw materials. The exhaust gas after heat exchange enters the reaction chamber 400 through the return pipe 221 and return gas pipe 134 to react with ammonia water. The gas after reaction is discharged through the exhaust pipe 420 and chimney pipe 310. The ammonium sulfite solid produced by the reaction falls onto the top of the filter plate 432. The first motor 430 is turned on at regular intervals. The first motor 430 drives the threaded filter plate 432 to slide upward in the reaction chamber 400 through the lead screw 431, and feeds the ammonium sulfite solid into the feeding hood 410 through the slot. The feeding hood 410 feeds the ammonium sulfite solid into the dropping trough 523. The ammonium sulfite solid falls through the dropping trough 523 and falls onto the top of the weighing plate 503 for weighing. According to the weight of the ammonium sulfite solid, the first piston plate 505 is controlled to move downward, and the gas is transported to the base 600 through the conveying pipe 510. The second piston plate 601 is compressed and moved by the gas. The third connecting rod 602 and the extrusion block 603 move with the second piston plate 601 to compress the pressure block 624, thereby adjusting the distance between the negative electrode 633 and the positive electrode 623. At this time, the resistance value at the drive motor 111 changes, and the output power at the drive motor 111 is adjusted, thereby adjusting the rotation speed of the rotating cylinder 110. When the weighing is completed at the weighing plate 503, the air chamber 502 is opened to drive the connecting shaft 521 and the rotating disk 522 to rotate, and the top material drop chute 523 is rotated to the bottom. The ammonium sulfite solid can then be rotated to the bottom and fall into the collection box 320 for collection under the action of gravity.

[0046] When this invention is used, the resistance value of the circuit connected to the drive motor 111 can be adjusted according to the weight of the ammonium sulfite solid produced by the reaction of sulfur dioxide and ammonia water per unit time through the set reaction chamber 400, weighing component and control component. In this way, the speed of the drive motor 111 can be adjusted according to the concentration of sulfur dioxide to adapt to different roasting stages and the adjustment is more accurate.

[0047] The heat exchanger 200 can transfer heat from the exhaust gas to the fixed cylinder 120 to preheat the raw materials, improve the efficiency of the raw material roasting, recover waste heat, reduce energy consumption, and cool the exhaust gas to prevent the temperature from being too high and affecting the reaction between sulfur dioxide and ammonia, thus affecting the treatment effect of sulfur dioxide gas.

[0048] The set-up weighing components, collection box 320, and reaction box 400 can treat sulfur dioxide in the exhaust gas and collect the ammonium sulfite solid generated by the reaction. It can be used as fertilizer through subsequent treatment, thereby improving the utilization rate of resources.

[0049] The sealing plate 440 can block the slot connecting the reaction tank 400 and the feeding hood 410 when sulfur dioxide reacts with ammonia, preventing sulfur dioxide and ammonia from being fully reacted and drifting into the control box 300, thus avoiding any impact on the health of the staff when the chimney pipe 310 is opened.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-chamber rotary kiln for molybdenum oxide with preheating function, comprising a bottom plate (100) and a rotary kiln body mounted on top of the bottom plate (100), characterized in that, The rotary kiln body includes a rotating cylinder (110), a fixed cylinder (120), a kiln tail cover (130), and a kiln head cover (140). The kiln head cover (140) and the kiln tail cover (130) are respectively installed at the top two ends of the bottom plate (100). The fixed cylinder (120) for preheating is fixedly connected to one end of the kiln head cover (140). The rotating cylinder (110) is rotatably connected between the fixed cylinder (120) and the kiln tail cover (130). A gear ring (113) is fixedly connected in the middle of the outer wall of the rotating cylinder (110). A drive motor (111) is fixedly connected to the top of the rotating cylinder (110). A transmission gear (112) is rotatably connected to the output end of the drive motor (111). The transmission gear (112) meshes with the gear ring (113). A heat exchange cylinder (200) is installed on one side of the kiln tail cover (130). A heat exchange component for recovering heat from the exhaust gas generated during processing in the rotating cylinder (110) is installed inside the heat exchange cylinder (200). A hot gas pipe (211) connected to the fixed cylinder (120) is installed at the tail end of the heat exchange cylinder (200). A control box (300) is installed at the top of the kiln tail hood (130), and a reaction box (400) for reacting with tail gas is installed on one side of the inner wall of the control box (300). The reaction box (400) is connected to the heat exchange cylinder (200) through a return gas pipe (134). A weighing assembly for weighing reactants in the reaction chamber (400) is installed in the middle of the inner wall of the control box (300). A feeding hood (410) for the reactants to pass through is connected between the reaction chamber (400) and the weighing assembly. A control assembly for adjusting the output power of the drive motor (111) is installed on the other side of the inner wall of the control box (300). A gas delivery pipe (510) for gas to pass through is installed between the weighing assembly and the control assembly.

2. The rotary kiln for molybdenum oxide with a preheating function according to claim 1, characterized in that, The heat exchange assembly includes a heat exchange tube (220) and a return pipe (221). The kiln tail cover (130) has an exhaust groove (131) on the side near the rotating cylinder (110). The exhaust groove (131) is connected to an exhaust pipe (132) at one end away from the rotating cylinder (110). The other end of the exhaust pipe (132) is connected to the inner wall of the heat exchange cylinder (200). The heat exchange tube (220) is spirally installed on the inner wall of the heat exchange cylinder (200) and connected to the exhaust pipe (132). One end of the return pipe (221) is connected to the tail end of the heat exchange tube (220). The other end of the return pipe (221) is connected to the return gas pipe (134). An air inlet pipe (210) for air intake is installed on the top of the heat exchange cylinder (200).

3. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 2, characterized in that, The reaction chamber (400) is equipped with a partition (402) on its inner wall. A first motor (430) is installed on the top of the partition (402). A lead screw (431) is installed at the output end of the first motor (430). A filter plate (432) is slidably connected to the inner wall of the reaction chamber (400). The filter plate (432) is threaded to the outer wall of the lead screw (431). A slot is provided on the side wall of the reaction chamber (400) to communicate with the feeding hood (410). A chimney pipe (310) for exhaust is connected to the top of the control box (300). An exhaust pipe (420) is connected between the reaction chamber (400) and the chimney pipe (310). The connection between the exhaust pipe (420) and the reaction chamber (400) is located at the bottom of the partition (402).

4. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 3, characterized in that, A sealing plate (440) is installed at the slot of the reaction chamber (400). A guide rod (442) is slidably connected to the inner wall of the sealing plate (440). A fixing plate (441) is fixedly connected to the top of the guide rod (442). The fixing plate (441) is installed on the inner wall of the reaction chamber (400) by bolts. A first connecting rod (444) is fixedly connected to the bottom of the sealing plate (440). A pressure plate (445) is fixedly connected to the bottom of the first connecting rod (444).

5. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 3, characterized in that, The weighing assembly includes a fixed plate (500), a second motor (520), and a rotating plate (522). The second motor (520) is fixedly connected to the inner wall of one side of the control box (300). A connecting shaft (521) is installed at the output end of the second motor (520). The rotating plate (522) is fixedly connected to the outer wall of the connecting shaft (521). The fixed plate (500) is installed at the tail end of the feeding hood (410). A fixed sleeve (501) is installed on one end of the fixed plate (500) near the rotating plate (522). A through-feed groove (523) is provided at the top and bottom of the outer wall of the rotating plate (522). The material dropping groove (523) at the top is connected to the bottom end of the feeding hood (410).

6. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 5, characterized in that, The weighing assembly further includes a weighing plate (503) and a first piston plate (505). The inner wall of the fixed sleeve (501) is provided with an air chamber (502). The first piston plate (505) is slidably connected to the inner wall of the air chamber (502). One end of the conveying pipe (510) is connected to the inner wall of the air chamber (502). A second connecting rod (504) is fixedly connected to the top of the first piston plate (505). The weighing plate (503) is fixedly connected to the top of the second connecting rod (504). A second spring (506) is fixedly connected between the first piston plate (505) and the air chamber (502).

7. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 5, characterized in that, The control box (300) has a door (301) rotatably connected to one side of its outer wall, and a collection box (320) is slidably connected to the bottom inner wall of the control box (300). The collection box (320) is located at the bottom of the material drop chute (523).

8. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 6, characterized in that, The control assembly includes a base (600), a top frame (610), and a sliding seat (620). The base (600) is installed on one side of the bottom inner wall of the control box (300). The top frame (610) is fixedly connected to the top of the base (600). The sliding seat (620) is fixedly connected to the inner wall of the top frame (610). Sliding sleeves (621) are slidably connected to both sides of the inner wall of the sliding seat (620). A negative electrode (633) and a positive electrode (623) are fixedly connected to opposite ends of the sliding sleeves (621) on both sides, respectively. The negative electrode (633) and the positive electrode (623) are connected in series with the drive motor (111) in the same circuit.

9. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 8, characterized in that, A third spring (626) is fixedly connected between the two sliding sleeves (621), and the inner walls of the two sliding sleeves (621) are slidably connected to the same sliding tube (625).

10. A dual-chamber rotary kiln for molybdenum oxide with preheating function according to claim 9, characterized in that, The control assembly further includes a second piston plate (601), an extrusion block (603), and a pressure block (624). The second piston plate (601) is slidably connected to the inner wall of the base (600). The other end of the conveying pipe (510) is connected to the inner wall of the base (600). A third connecting rod (602) is fixedly connected to the top of the second piston plate (601). The third connecting rod (602) is slidably connected to the inner wall of the top frame (610) and the sliding seat (620). The extrusion block (603) is fixedly connected to the top of the third connecting rod (602). The pressure block (624) is fixedly connected to the bottom position on the opposite side of the sliding sleeve (621). The pressure block (624) is in contact with the extrusion block (603).

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