Process and equipment for continuously producing high-purity selenium dioxide

Abstract

The invention relates to the field of inorganic chemical industry production, and discloses a high-purity selenium dioxide continuous production process and equipment, the equipment comprises a cooling crystallization barrel, one side of the cooling crystallization barrel is provided with a selenium dioxide production mechanism, the selenium dioxide production mechanism is used for selenium dioxide production, and the cooling crystallization barrel is provided with a cooling crystallization barrel. An air pressure generation mechanism is arranged outside the cooling crystallization barrel, a gas on-off mechanism is arranged at the top of the air pressure generation mechanism, an air exhaust filtering mechanism is arranged at the top of the cooling crystallization barrel, and a tail barrel is arranged on the side, away from the selenium dioxide production mechanism, of the cooling crystallization barrel; the air pressure generating mechanism is used for keeping the negative pressure state in the cooling crystallization barrel and the tail barrel. According to the selenium dioxide production device, the inside of the feeding pipeline is filled with the materials, so that the materials can be supplemented in time after the materials are consumed, and selenium dioxide can be continuously and efficiently produced, so that the yield and the purity are improved, economic benefits are directly brought, energy waste is avoided, and economic loss is avoided.

Description

Technical Field

[0001] The present invention relates to the field of inorganic chemical production, and specifically to a process and equipment for continuous production of high-purity selenium dioxide. Background Art

[0002] Selenium dioxide is an important selenium compound. It is a white crystalline powder at room temperature, hygroscopic, easy to sublimate, toxic and highly oxidizing. It is a key raw material for preparing high-purity selenium and other selenium compounds, and is used in organic synthesis in the chemical industry, such as the oxidation of alcohols and as a catalyst in the electrolytic manganese industry. It can also be used in fields such as glass decolorization, ceramic glazes and the electronics industry.

[0003] The intermittent production process of the high-purity selenium dioxide continuous production equipment in the prior art: In the production process of selenium dioxide, usually the raw material selenium powder is first put into the oxidation furnace, then the oxidation furnace is heated to the reaction temperature, and oxygen is introduced to react with the selenium powder to generate selenium dioxide gas, and then the temperature is reduced, and the selenium dioxide solid is collected by condensation. Since selenium dioxide gas is generated in the production process and selenium dioxide gas is highly harmful to the human body, in order to prevent gas leakage, this production method conducts one-time feeding and sealed production before each start-up and heating of the oxidation furnace, and the heating and cooling times are long, so the production cycle is long, the output is small, and the production efficiency is low.

[0004] The existing continuous production process: Usually, the selenium material is added to the oxidation furnace from the hopper, the feeding valve is closed and sealed, and then the electric heating is started to raise the temperature, or it is also necessary to adopt a weighing and metering method to feed the selenium raw material. Continuous production is achieved by adding materials regularly and quantitatively, and using a valve feeding bin for sealing and buffering. However, the regular and quantitative feeding cannot replenish materials in a timely manner according to the consumption. If the materials are consumed in advance, they cannot be replenished in a timely manner, and at this time, the oxidation furnace is still running, resulting in waste of energy and economic losses. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a process and equipment for continuous production of high-purity selenium dioxide, which solves the problems of small output and low production efficiency in the intermittent production process of the prior art, and the problem that the existing continuous production process cannot replenish materials in a timely manner when the materials are consumed, resulting in waste of energy and economic losses.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A continuous production device for high-purity selenium dioxide includes a cooling and crystallization barrel. One side of the cooling and crystallization barrel is provided with a selenium dioxide production mechanism. The outer shape of the cooling and crystallization barrel is a cuboid. The selenium dioxide production mechanism is used for the production of selenium dioxide. An air pressure generating mechanism is arranged outside the cooling and crystallization barrel. A gas on-off mechanism is arranged at the top of the air pressure generating mechanism. An air extraction and filtration mechanism is arranged at the top of the cooling and crystallization barrel. A tail barrel is arranged on one side of the cooling and crystallization barrel away from the selenium dioxide production mechanism. The air pressure generating mechanism is used to maintain a negative pressure state inside the cooling and crystallization barrel and the tail barrel.

[0007] Preferably, the selenium dioxide production mechanism includes a high-temperature oxidation furnace. The high-temperature oxidation furnace is arranged on one side of the cooling and crystallization barrel. A feed pipe is fixedly connected to the top of the high-temperature oxidation furnace. An installation frame is fixedly connected to the bottom end inside the high-temperature oxidation furnace. A buffer receiving basin is detachably connected to the top of the installation frame. The bottom of the feed pipe is arranged inside the buffer receiving basin. A level gauge one is arranged inside the feed pipe. A double-screw conveyor is rotatably connected to the bottom end inside the cooling and crystallization barrel. The double-screw conveyor can compact the bottom products, thereby being able to seal the toxic selenium dioxide gas by the compaction of the products, avoiding the overflow of the toxic selenium dioxide gas, maintaining the safety of the working space, and discharging the high-purity selenium dioxide finished products by the double-screw conveyor. A motor is fixedly connected to the bottom of the cooling and crystallization barrel. Gears are fixedly connected to both ends of the output end of the motor and the double-screw conveyor. The two gears of the double-screw conveyor are meshed with each other. The gear at the output end of the motor is meshed with one of the gears of the double-screw conveyor. A level gauge two is fixedly connected to one side of the cooling and crystallization barrel. A discharge pipe is fixedly connected to the bottom of the cooling and crystallization barrel. A protective plate is fixedly connected to the bottom of one side of the cooling and crystallization barrel.

[0008] Preferably, the air pressure generating mechanism includes a sliding cylinder. A movable plug is slidably connected inside the sliding cylinder. A fixed cylinder is fixedly connected to the top of the movable plug. A connecting head is fixedly connected to the top of the fixed cylinder. A slide rail is fixedly connected to one side of the cooling and crystallization barrel. The outside of the sliding cylinder is slidably connected to the outside of the slide rail. A connecting rod is rotatably connected to the bottom of the sliding cylinder. An eccentric wheel is fixedly connected to the output end of the motor. The outside of the eccentric wheel is rotatably connected to the bottom of the connecting rod.

[0009] Preferably, the gas on-off mechanism includes a fixed pipe, the outside of the fixed pipe is fixedly connected to the middle of the connector, a limit hole plate is slidably connected inside the fixed pipe, a return spring is arranged inside the fixed pipe, the top of the limit hole plate is fixedly connected to a sliding pipe, the sliding pipe is slidably connected inside the fixed pipe, a plurality of ventilation holes are formed inside the sliding pipe, an air outlet pipe is fixedly connected inside the connector, a thrust spring is arranged inside the air outlet pipe, a perforated plate is slidably connected inside the air outlet pipe, one end of the return spring is fixedly connected to the bottom of the limit hole plate, and the other end of the return spring is fixedly connected to the inner bottom end of the fixed pipe.

[0010] Preferably, the air extraction and filtration mechanism includes a fixed box, the bottom of the fixed box is fixedly connected to the top of the cooling crystallization barrel, an impeller is rotatably connected inside the fixed box, a connecting column is fixedly connected to the bottom of the impeller, a tension spring is arranged inside the connecting column, a limit sliding plate is slidably connected inside the connecting column, a movable column is fixedly connected to the bottom of the limit sliding plate, a cleaning brush is fixedly connected to the bottom of the movable column, a filter cylinder is fixedly connected to the inner top end of the cooling crystallization barrel, an automatic valve is fixedly connected to the outside of the fixed box, one end of the automatic valve away from the fixed box is fixedly connected to a communicating pipe, one end of the communicating pipe away from the fixed box is fixedly connected to the outside of the filter cylinder, a connecting pipe is fixedly connected to the outside of the fixed box, the bottom of the connecting pipe is fixedly connected to the top of the fixed pipe, an electric valve is fixedly connected to the top of the connecting pipe, one end of the electric valve away from the connecting pipe is fixedly connected to a ventilation pipe, one end of the ventilation pipe away from the electric valve is fixedly connected to a filter head, the top of the filter head is rotatably connected to the inner top end of the tail barrel, the bottom of the movable column penetrates through the bottom of the connecting column, one end of the tension spring is fixedly connected to the inside of the connecting column, and the other end of the tension spring is fixedly connected to the top of the limit sliding plate.

[0011] Preferably, an inspection port is provided on the outside of the high-temperature oxidation furnace, and a rotating door is rotatably connected to the outside of the high-temperature oxidation furnace.

[0012] Preferably, a support frame is fixedly connected to the bottom of the high-temperature oxidation furnace, and placing frames are fixedly connected to the bottoms of the cooling crystallization barrel and the tail barrel.

[0013] Preferably, sealing doors are rotatably connected to the bottom sides of the cooling crystallization barrel and the tail barrel, and stainless steel pipes are fixedly connected between the cooling crystallization barrel and the tail barrel and the selenium dioxide production mechanism.

[0014] Preferably, one end of the thrust spring is fixedly connected to one side of the perforated plate, and the other end of the thrust spring is fixedly connected to the inside of the air outlet pipe.

[0015] A process for continuously producing high-purity selenium dioxide includes the following production process steps: Step 1: The electromagnetic vibrating feeder feeds the raw materials in the silo into the buffer receiving basin inside the high-temperature oxidation furnace through the feeding pipeline. The level gauge 1 is used to slowly melt and vaporize the raw materials in the buffer receiving basin to produce vaporized selenium dioxide. The feeding speed is fed back to the electromagnetic vibrating feeder through the level gauge signal in the feeding pipeline, enabling the selenium ore to evenly enter the buffer receiving basin inside the high-temperature oxidation furnace and keeping the inside of the feeding pipeline always filled with materials. Step 2: The vaporized selenium dioxide in Step 1 enters the inside of the cooling and crystallization barrel through the stainless steel pipeline between the cooling and crystallization barrel and the high-temperature oxidation furnace for cooling and crystallization. The cooled and crystallized selenium dioxide settles to the bottom of the crystallization barrel. When the crystallized selenium dioxide inside the cooling and crystallization barrel reaches the position of the level gauge 2, it is then stacked and output from the inside of the cooling and crystallization barrel through the double-screw conveyor. Step 3: The pneumatic generating mechanism, gas on-off mechanism, and air extraction and filtration mechanism are used to create a negative pressure state inside the cooling and crystallization barrel, tail barrel, and high-temperature oxidation furnace, thereby preventing the discharge of toxic gases inside the cooling and crystallization barrel, tail barrel, and high-temperature oxidation furnace.

[0016] The present invention provides a process and equipment for continuously producing high-purity selenium dioxide. It has the following beneficial effects: 1. By filling the inside of the feeding pipeline with materials, the present invention enables timely replenishment of materials after consumption, can continuously and efficiently produce selenium dioxide, thereby increasing the output and purity, directly bringing economic benefits, and can replenish materials in a timely manner, preventing the situation where there is no material during the operation of the oxidation furnace, thus avoiding energy waste and economic losses. 2. The pipeline filled with materials in the present invention can prevent the leakage of selenium dioxide gas, and at the same time, the accumulated materials can prevent gas from escaping. Additionally, the cooperation of the pneumatic generating mechanism, gas on-off mechanism, and air extraction and filtration mechanism can maintain a negative pressure throughout the reaction process, with no dust and gas leakage, and the whole process does not require human participation, featuring a simple structure, being safe and efficient, having good economic benefits, and being safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional view of the present invention Figure 1 .

[0018] Figure 2 is a three-dimensional view of the present invention Figure 2 .

[0019] Figure 3 is a schematic structural view of the buffer receiving basin in the present invention.

[0020] Figure 4 This is a schematic structural diagram of the cooling crystallization barrel in the present invention.

[0021] Figure 5 This is a schematic structural diagram of the double - screw conveyor in the present invention.

[0022] Figure 6 This is a schematic structural diagram of the slide rail in the present invention.

[0023] Figure 7 This is a schematic structural diagram of the movable plug in the present invention.

[0024] Figure 8 This is a schematic internal structure diagram of the fixed cylinder in the present invention.

[0025] Figure 9 This is a schematic internal structure diagram of the connecting column in the present invention.

[0026] Among them, 1. Cooling crystallization barrel; 2. Selenium dioxide production mechanism; 201. High - temperature oxidation furnace; 202. Feed pipeline; 203. Mounting frame; 204. Buffer receiving basin; 205. Level gauge 1; 206. Double - screw conveyor; 207. Motor; 208. Level gauge 2; 209. Discharge pipe; 210. Protection plate; 211. Inspection port; 212. Rotating door; 3. Air pressure generating mechanism; 301. Sliding cylinder; 302. Movable plug; 303. Fixed cylinder; 304. Connector; 305. Slide rail; 306. Connecting rod; 307. Eccentric wheel; 4. Gas on - off mechanism; 401. Fixed pipe; 402. Limit hole plate; 403. Return spring; 404. Sliding pipe; 405. Vent hole; 406. Outlet pipe; 407. Perforated plate; 408. Thrust spring; 5. Air extraction and filtration mechanism; 501. Fixed box; 502. Impeller; 503. Connecting column; 504. Pull spring; 505. Limit sliding disk; 506. Movable column; 507. Cleaning brush; 508. Filter cylinder; 509. Automatic valve; 510. Connecting pipe; 511. Connecting tube; 512. Electric valve; 513. Vent pipe; 514. Filter head; 6. Tail barrel; 7. Placing rack; 8. Support frame; 9. Sealing door; 10. Stainless - steel pipeline. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to the attached Figure 1 - attached Figure 9, an embodiment of the present invention provides a continuous production device for high-purity selenium dioxide, including a cooling and crystallization barrel 1. A selenium dioxide production mechanism 2 is arranged on one side of the cooling and crystallization barrel 1. The cooling and crystallization barrel 1 is in the shape of a cuboid. The use of the cuboid setting of the cooling and crystallization barrel 1 can make the product crystallize faster. The selenium dioxide production mechanism 2 is used for the production of selenium dioxide. An air pressure generating mechanism 3 is arranged outside the cooling and crystallization barrel 1. A gas on-off mechanism 4 is arranged on the top of the air pressure generating mechanism 3. An air extraction and filtration mechanism 5 is arranged on the top of the cooling and crystallization barrel 1. A tail barrel 6 is arranged on the side of the cooling and crystallization barrel 1 away from the selenium dioxide production mechanism 2. The air pressure generating mechanism 3 is used to maintain a negative pressure state inside the cooling and crystallization barrel 1 and the tail barrel 6. Sealing doors 9 are rotatably connected to the bottom of one side of the cooling and crystallization barrel 1 and the tail barrel 6 respectively. Stainless steel pipes 10 are fixedly connected between the cooling and crystallization barrel 1, the tail barrel 6 and the selenium dioxide production mechanism 2. The stainless steel pipes 10 can realize the gas circulation among the cooling and crystallization barrel 1, the tail barrel 6 and the selenium dioxide production mechanism 2.

[0029] The selenium dioxide production mechanism 2 includes a high-temperature oxidation furnace 201 which can vaporize the selenium dioxide raw material. The high-temperature oxidation furnace 201 is arranged on one side of the cooling crystallization barrel 1. A feed pipe 202 is fixedly connected to the top of the high-temperature oxidation furnace 201. The inside of the feed pipe 202 is filled with materials, so that gas will not overflow from the feed pipe 202. An installation frame 203 is fixedly connected to the inner bottom end of the high-temperature oxidation furnace 201. The installation frame 203 provides an installation position. A buffer receiving basin 204 is detachably connected to the top of the installation frame 203. The buffer receiving basin 204 can hold the selenium dioxide raw material. The bottom of the feed pipe 202 is arranged inside the buffer receiving basin 204. A level gauge 205 is arranged inside the feed pipe 202. The level gauge 205 can measure the amount of raw materials inside the feed pipe 202, so that the signal detected by the level gauge 205 can be transmitted to the electromagnetic vibrating feeder, enabling the electromagnetic vibrating feeder to convey the raw materials into the feed pipe 202, so that continuous replenishment of materials can be carried out in the feed pipe 202. A double-screw conveyor 206 is rotatably connected to the inner bottom end of the cooling crystallization barrel 1. The bottom products are piled up tightly on the double-screw conveyor 206, so that the toxic selenium dioxide gas can be sealed by the piling up of the products, thus maintaining the safety of the working space and enabling the high-purity selenium dioxide finished products to be discharged through the double-screw conveyor 206. A motor 207 is fixedly connected to the bottom of the cooling crystallization barrel 1. The motor 207 can provide power. Gears are fixedly connected to both ends of the output end of the motor 207 and the double-screw conveyor 206. The two gears of the double-screw conveyor 206 are meshed. The gear at the output end of the motor 207 is meshed with one of the gears of the double-screw conveyor 206. A level gauge 208 is fixedly connected to one side of the cooling crystallization barrel 1. The level gauge 208 can provide the position for detecting the materials. A discharge pipe 209 is fixedly connected to the bottom of the cooling crystallization barrel 1. The discharge pipe 209 can be blocked when no objects are discharged and can facilitate discharging at the same time. A protective plate 210 is fixedly connected to the bottom of one side of the cooling crystallization barrel 1. An inspection opening 211 is opened on the outside of the high-temperature oxidation furnace 201. A rotating door 212 is rotatably connected to the outside of the high-temperature oxidation furnace 201. A support frame 8 is fixedly connected to the bottom of the high-temperature oxidation furnace 201. Placement frames 7 are fixedly connected to the bottoms of the cooling crystallization barrel 1 and the tail barrel 6. The electromagnetic vibrating feeder feeds the raw materials in the bin into the buffer receiving basin 204 inside the high-temperature oxidation furnace 201 through the feed pipe 202, and uses the level gauge 205 to slowly melt and vaporize the raw materials in the buffer receiving basin 204 to produce vaporized selenium dioxide. The feeding speed is fed back to the electromagnetic vibrating feeder through the level gauge signal in the feed pipe 202, enabling the selenium ore to evenly enter the buffer receiving basin 204 inside the high-temperature oxidation furnace 201 and keeping the inside of the feed pipe 202 always filled with materials. Therefore, the toxic gas in the cooling crystallization barrel 1 will not overflow through the feed pipe 202.The vaporized selenium dioxide enters the interior of the cooling and crystallization barrel 1 through the stainless steel pipe 10 between the cooling and crystallization barrel 1 and the high-temperature oxidation furnace 201 for cooling and crystallization. The cooled and crystallized selenium dioxide settles to the bottom of the crystallization barrel. When the crystallized selenium dioxide inside the cooling and crystallization barrel 1 reaches the position of the level gauge two 208, the motor 207 is started. After the motor 207 is started, it can drive the double-screw conveyor 206 through the belt to stack the crystallized selenium dioxide. At this time, the toxic gas is blocked by the stacked crystallized selenium dioxide, so the toxic gas will not be discharged, and the double-screw conveyor 206 can be used to output the interior of the cooling and crystallization barrel 1.

[0030] The air pressure generating mechanism 3 includes a sliding cylinder 301. An activity plug 302 is slidably connected inside the sliding cylinder 301. The activity plug 302 has the function of lower limit. A fixed cylinder 303 is fixedly connected to the top of the activity plug 302. The combination of the sliding cylinder 301 and the fixed cylinder 303 can exhaust and inhale air. A connection head 304 is fixedly connected to the top of the fixed cylinder 303. The connection head 304 can fix the fixed cylinder 303 and provide an installation position. A slide rail 305 is fixedly connected to one side of the cooling and crystallization barrel 1. The slide rail 305 can maintain the stability of the sliding cylinder 301 when it slides. The outside of the sliding cylinder 301 is slidably connected to the outside of the slide rail 305. A connecting rod 306 is rotatably connected to the bottom of the sliding cylinder 301. The connecting rod 306 can play a connecting role. The output end of the motor 207 is fixedly connected to an eccentric wheel 307. When the eccentric wheel 307 rotates, it can drive the bottom of the connecting rod 306 to rotate, so as to drive the top of the connecting rod 306 to move up and down, and then drive the sliding cylinder 301 to move up and down. The outside of the eccentric wheel 307 is rotatably connected to the bottom of the connecting rod 306. When the motor 207 rotates, it can drive the eccentric wheel 307 to rotate. After the eccentric wheel 307 rotates, it can drive the bottom end of the connecting rod 306 to rotate, so as to drive the top of the connecting rod 306 to move up and down. When the sliding cylinder 301 moves upward, the air in the sliding cylinder 301 and the fixed cylinder 303 can be exhausted. When the sliding cylinder 301 moves downward, it can start to inhale air, so that the interiors of the cooling and crystallization barrel 1 and the tail barrel 6 can be kept in a negative pressure state through the air extraction and filtration mechanism 5.

[0031] The gas on-off mechanism 4 includes a fixed pipe 401 which can provide an installation position. The outside of the fixed pipe 401 is fixedly connected to the middle of the connector 304. A limit hole plate 402 is slidably connected inside the fixed pipe 401, and the limit hole plate 402 can play a limiting role. A return spring 403 is arranged inside the fixed pipe 401. The return spring 403 can use its own elastic force to make the limit hole plate 402 need a suction force to move downward when it needs to move downward, so as to move the limit hole plate 402 and the sliding pipe 404 downward. The top of the limit hole plate 402 is fixedly connected to a sliding pipe 404 which can provide the function of admitting air. The sliding pipe 404 is slidably connected inside the fixed pipe 401. A plurality of ventilation holes 405 are opened inside the sliding pipe 404. The ventilation holes 405 can allow gas to enter the lower part of the fixed pipe 401 through the top of the ventilation holes 405 and the holes on the limit hole plate 402. An air outlet pipe 406 is fixedly connected inside the connector 304. The air outlet pipe 406 can provide an installation position and an exhaust passage. A thrust spring 408 is arranged inside the air outlet pipe 406. A perforated plate 407 is slidably connected inside the air outlet pipe 406. One end of the return spring 403 is fixedly connected to the bottom of the limit hole plate 402, and the other end of the return spring 403 is fixedly connected to the inner bottom end of the fixed pipe 401. One end of the thrust spring 408 is fixedly connected to one side of the perforated plate 407, and the other end of the thrust spring 408 is fixedly connected to the inside of the air outlet pipe 406. When exhausting, there is an upward air pressure on the limit hole plate 402, so that the top of the limit hole plate 402 abuts against the middle of the fixed pipe 401, thereby preventing the gas from being discharged from the sliding pipe 404. At this time, the gas will push the perforated plate 407 to move away from the fixed pipe 401. At this time, the holes on the perforated plate 407 are not blocked by the inside of the air outlet pipe 406, and the gas will be discharged to the outside through the holes on the perforated plate 407. When inhaling, the perforated plate 407 is subjected to a suction force towards the fixed pipe 401, so that the perforated plate 407 closely adheres to the side of the air outlet pipe 406 close to the fixed pipe 401 inside, so that the holes on the perforated plate 407 are blocked by the inside of the air outlet pipe 406. At this time, the outside gas will not enter the inside of the fixed pipe 401, and the limit hole plate 402 will move downward under the action of the suction force, and then can drive the sliding pipe 404 to move downward. When the ventilation holes 405 on the sliding pipe 404 move downward, when the ventilation holes 405 move below the middle of the fixed pipe 401, the gas can enter the ventilation holes 405 through the top of the sliding pipe 404, enter the limit hole plate 402 through the ventilation holes 405, then enter the lower part of the fixed pipe 401 through the limit hole plate 402, and can enter the inside of the fixed box 501, so as to realize the function of pumping air.

[0032] The air extraction and filtration mechanism 5 includes a fixed box 501 which can provide an installation position. The bottom of the fixed box 501 is fixedly connected to the top of the cooling crystallization barrel 1. Inside the fixed box 501, there is a rotatably connected impeller 502 which can rotate under the action of air flow. At the bottom of the impeller 502, there is a fixedly connected connecting column 503 which provides an installation position and connection conditions. Inside the connecting column 503, there is a tension spring 504. Inside the connecting column 503, there is a slidably connected limit sliding disk 505 which can only slide inside the connecting column 503 but cannot rotate inside the connecting column 503. At the bottom of the limit sliding disk 505, there is a fixedly connected movable column 506 which has a connecting function. At the bottom of the movable column 506, there is a fixedly connected cleaning brush 507. At the inner top of the cooling crystallization barrel 1, there is a fixedly connected filter cylinder 508. The cleaning brush 507 can clean the bottom of the filter cylinder 508. Outside the fixed box 501, there is a fixedly connected automatic valve 509. One end of the automatic valve 509 away from the fixed box 501 is fixedly connected to a communicating pipe 510 which can play a connecting role. One end of the communicating pipe 510 away from the fixed box 501 is fixedly connected to the outside of the filter cylinder 508. Outside the fixed box 501, there is a fixedly connected connecting pipe 511. The bottom of the connecting pipe 511 is fixedly connected to the top of the fixed pipe 401. At the top of the connecting pipe 511, there is a fixedly connected electric valve 512. One end of the electric valve 512 away from the connecting pipe 511 is fixedly connected to a ventilation pipe 513. One end of the ventilation pipe 513 away from the electric valve 512 is fixedly connected to a filter head 514. The top of the filter head 514 is rotatably connected to the inner top of the tail barrel 6. The bottom of the movable column 506 penetrates through the bottom of the connecting column 503. One end of the tension spring 504 is fixedly connected inside the connecting column 503, and the other end of the tension spring 504 is fixedly connected to the top of the limit sliding disk 505. When the fixed pipe 401 is extracting air, the suction force can be transmitted to the inside of the fixed box 501 through the connecting pipe 511. By opening the automatic valve 509 and closing the electric valve 512, at this time, the gas will draw the gas in the cooling crystallization barrel 1 into the fixed box 501 through the filtration of the communicating pipe 510 and the filter cylinder 508, and can drive the impeller 502 to rotate. When the impeller 502 rotates, it can drive the connecting column 503 to rotate. After the connecting column 503 rotates, it can drive the limit sliding disk 505 to rotate. After the limit sliding disk 505 rotates, it can drive the movable column 506 to rotate, thereby driving the cleaning brush 507 to rotate, and then cleaning the bottom of the filter cylinder 508, so as to prevent the filter cylinder 508 from being blocked. When closing the automatic valve 509 and opening the electric valve 512, the air in the tail barrel 6 can be drawn away, thereby making the air pressure difference inside the tail barrel 6 greater than the air pressure difference in the cooling crystallization barrel 1, and then enabling the remaining tail gas to enter the inside of the tail barrel 6 for cleaning by using the tail barrel 6.

[0033] A process for continuously producing high-purity selenium dioxide, comprising the following production process steps: Step 1: The electromagnetic vibrating feeder feeds the raw materials in the silo into the buffer receiving basin 204 inside the high-temperature oxidation furnace 201 through the feed pipeline 202, and uses the level gauge 1 205 to slowly melt and gasify the raw materials in the buffer receiving basin 204 to produce gasified selenium dioxide. The feeding speed is fed back to the electromagnetic vibrating feeder through the level gauge signal in the feed pipeline 202, enabling the selenium ore to uniformly enter the buffer receiving basin 204 inside the high-temperature oxidation furnace 201 and keeping the inside of the feed pipeline 202 always full of materials. Step 2: The gasified selenium dioxide in Step 1 enters the inside of the cooling and crystallization barrel 1 through the stainless steel pipeline 10 between the cooling and crystallization barrel 1 and the high-temperature oxidation furnace 201 for cooling and crystallization. The cooled and crystallized selenium dioxide settles to the bottom of the crystallization barrel. When the crystallized selenium dioxide in the cooling and crystallization barrel 1 reaches the position of the level gauge 2 208, it is then stacked and output from the inside of the cooling and crystallization barrel 1 by the double-screw conveyor 206. Step 3: Use the air pressure generating mechanism 3, the gas on-off mechanism 4 and the air extraction and filtration mechanism 5 to form a negative pressure state inside the cooling and crystallization barrel 1, the tail barrel 6 and the high-temperature oxidation furnace 201, thereby preventing toxic gases from being discharged inside the cooling and crystallization barrel 1, the tail barrel 6 and the high-temperature oxidation furnace 201.

[0034] Working principle: The electromagnetic vibrating feeder feeds the raw materials in the silo into the buffer receiving basin 204 inside the high-temperature oxidation furnace 201 through the feed pipeline 202, and uses the level gauge 1 205 to slowly melt and gasify the raw materials in the buffer receiving basin 204 to produce gasified selenium dioxide. The feeding speed is fed back to the electromagnetic vibrating feeder through the level gauge signal in the feed pipeline 202, enabling the selenium ore to uniformly enter the buffer receiving basin 204 inside the high-temperature oxidation furnace 201 and keeping the inside of the feed pipeline 202 always full of materials. Therefore, the toxic gas in the cooling and crystallization barrel 1 will not overflow through the feed pipeline 202. The gasified selenium dioxide enters the inside of the cooling and crystallization barrel 1 through the stainless steel pipeline 10 between the cooling and crystallization barrel 1 and the high-temperature oxidation furnace 201 for cooling and crystallization. The cooled and crystallized selenium dioxide settles to the bottom of the crystallization barrel. When the crystallized selenium dioxide in the cooling and crystallization barrel 1 reaches the position of the level gauge 2 208, then start the motor 207. After the motor 207 starts, it can drive the double-screw conveyor 206 through the belt to stack the crystallized selenium dioxide. At this time, the toxic gas is blocked by the stacked crystallized selenium dioxide, so the toxic gas will not be discharged, and the double-screw conveyor 206 can be used to output the inside of the cooling and crystallization barrel 1. When the motor 207 rotates, it can drive the eccentric wheel 307 to rotate. After the eccentric wheel 307 rotates, it can drive the bottom end of the connecting rod 306 to rotate, thereby driving the top of the connecting rod 306 to move up and down. When the sliding cylinder 301 moves upward, the air in the sliding cylinder 301 and the fixed cylinder 303 can be discharged. When the sliding cylinder 301 moves downward, it can start to inhale, so that the interiors of the cooling crystallization barrel 1 and the tail barrel 6 can be kept in a negative pressure state through the air extraction and filtration mechanism 5; When exhausting, there is an upward air pressure on the limit hole plate 402, so that the top of the limit hole plate 402 abuts against the middle part of the fixed pipe 401, thereby preventing the gas from being discharged from the sliding pipe 404. At this time, the gas will push the perforated plate 407 to move away from the fixed pipe 401. At this time, the holes on the perforated plate 407 are not blocked by the inside of the air outlet pipe 406, and the gas will be discharged to the outside through the holes on the perforated plate 407. When inhaling, the perforated plate 407 is subjected to a suction force towards the fixed pipe 401, so that the perforated plate 407 can be closely attached to the side of the inside of the air outlet pipe 406 close to the fixed pipe 401, so that the holes on the perforated plate 407 are blocked by the inside of the air outlet pipe 406. At this time, the outside gas will not enter the inside of the fixed pipe 401, and the limit hole plate 402 will move downward under the action of the suction force, and then drive the sliding pipe 404 to move downward. When the ventilation hole 405 on the sliding pipe 404 moves downward, when the ventilation hole 405 moves below the middle part of the fixed pipe 401, the gas can enter the ventilation hole 405 through the top of the sliding pipe 404, enter the limit hole plate 402 through the ventilation hole 405, then enter the lower part of the fixed pipe 401 through the limit hole plate 402, and can enter the inside of the fixed box 501, thus realizing the air extraction function; When the fixed pipe 401 is exhausting air, the connecting pipe 511 can transmit the suction force to the inside of the fixed box 501. By opening the automatic valve 509 and closing the electric valve 512, the gas will then be drawn into the inside of the fixed box 501 through the communication pipe 510 and the filtration of the filter cartridge 508 from the gas in the cooling crystallization barrel 1, and can drive the impeller 502 to rotate. When the impeller 502 rotates, it can drive the connecting column 503 to rotate. After the connecting column 503 rotates, it can drive the limit sliding disk 505 to rotate. After the limit sliding disk 505 rotates, it can drive the movable column 506 to rotate, thereby driving the cleaning brush 507 to rotate, and then cleaning the bottom of the filter cartridge 508, so as to prevent the filter cartridge 508 from being blocked. When the automatic valve 509 is closed and the electric valve 512 is opened, the air in the tail barrel 6 can be drawn away, and then the air pressure difference inside the tail barrel 6 can be made greater than the air pressure difference in the cooling crystallization barrel 1, and then the remaining tail gas can enter the inside of the tail barrel 6 for cleaning by using the tail barrel 6.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous production device for high-purity selenium dioxide, comprising a cooling and crystallization barrel (1), characterized in that, On one side of the cooling and crystallization barrel (1), a selenium dioxide production mechanism (2) is provided. The cooling and crystallization barrel (1) is in the shape of a cuboid. The selenium dioxide production mechanism (2) is used for the production of selenium dioxide. An air pressure generating mechanism (3) is arranged outside the cooling and crystallization barrel (1). A gas on-off mechanism (4) is arranged at the top of the air pressure generating mechanism (3). An air extraction and filtration mechanism (5) is arranged at the top of the cooling and crystallization barrel (1). A tail barrel (6) is arranged on the side of the cooling and crystallization barrel (1) away from the selenium dioxide production mechanism (2). The air pressure generating mechanism (3) is used to maintain a negative pressure state inside the cooling and crystallization barrel (1) and the tail barrel (6).

2. The continuous production equipment for high-purity selenium dioxide according to claim 1, characterized in that, The selenium dioxide production mechanism (2) includes a high-temperature oxidation furnace (201). The high-temperature oxidation furnace (201) is arranged on one side of the cooling and crystallization barrel (1). A feed pipe (202) is fixedly connected to the top of the high-temperature oxidation furnace (201). An installation frame (203) is fixedly connected to the bottom end inside the high-temperature oxidation furnace (201). A buffer receiving basin (204) is detachably connected to the top of the installation frame (203). The bottom of the feed pipe (202) is arranged inside the buffer receiving basin (204). A level gauge one (205) is arranged inside the feed pipe (202). A double-screw conveyor (206) is rotatably connected to the bottom end inside the cooling and crystallization barrel (1). A motor (207) is fixedly connected to the bottom of the cooling and crystallization barrel (1). Gears are fixedly connected to both ends of the output end of the motor (207) and the double-screw conveyor (206). The two gears of the double-screw conveyor (206) are meshed with each other. The gear at the output end of the motor (207) is meshed with one of the gears of the double-screw conveyor (206). A level gauge two (208) is fixedly connected to one side of the cooling and crystallization barrel (1). A discharge pipe (209) is fixedly connected to the bottom of the cooling and crystallization barrel (1). A protective plate (210) is fixedly connected to the bottom of one side of the cooling and crystallization barrel (1).

3. The continuous production equipment for high-purity selenium dioxide according to claim 2, characterized in that, The air pressure generating mechanism (3) includes a sliding cylinder (301). A movable plug (302) is slidably connected inside the sliding cylinder (301). A fixed cylinder (303) is fixedly connected to the top of the movable plug (302). A connecting head (304) is fixedly connected to the top of the fixed cylinder (303). A slide rail (305) is fixedly connected to one side of the cooling and crystallization barrel (1). The outside of the sliding cylinder (301) is slidably connected to the outside of the slide rail (305). A connecting rod (306) is rotatably connected to the bottom of the sliding cylinder (301). An eccentric wheel (307) is fixedly connected to the output end of the motor (207). The outside of the eccentric wheel (307) is rotatably connected to the bottom of the connecting rod (306).

4. A continuous production device for high-purity selenium dioxide according to claim 3, characterized in that, The gas on-off mechanism (4) includes a fixed pipe (401), the outside of the fixed pipe (401) is fixedly connected to the middle of the connector (304), a limit hole disk (402) is slidably connected inside the fixed pipe (401), a return spring (403) is arranged inside the fixed pipe (401), the top of the limit hole disk (402) is fixedly connected to a sliding pipe (404), the sliding pipe (404) is slidably connected inside the fixed pipe (401), a plurality of ventilation holes (405) are formed inside the sliding pipe (404), an air outlet pipe (406) is fixedly connected inside the connector (304), a thrust spring (408) is arranged inside the air outlet pipe (406), a perforated plate (407) is slidably connected inside the air outlet pipe (406), one end of the return spring (403) is fixedly connected to the bottom of the limit hole disk (402), and the other end of the return spring (403) is fixedly connected to the inner bottom end of the fixed pipe (401).

5. A continuous production device for high-purity selenium dioxide according to claim 4, characterized in that, The air extraction and filtration mechanism (5) includes a fixed box (501), the bottom of the fixed box (501) is fixedly connected to the top of the cooling and crystallization barrel (1), an impeller (502) is rotatably connected inside the fixed box (501), the bottom of the impeller (502) is fixedly connected to a connecting column (503), a tension spring (504) is arranged inside the connecting column (503), a limit sliding disk (505) is slidably connected inside the connecting column (503), the bottom of the limit sliding disk (505) is fixedly connected to a movable column (506), the bottom of the movable column (506) is fixedly connected to a cleaning brush (507), a filter cylinder (508) is fixedly connected to the inner top end of the cooling and crystallization barrel (1), an automatic valve (509) is fixedly connected to the outside of the fixed box (501), one end of the automatic valve (509) away from the fixed box (501) is fixedly connected to a communication pipe (510), one end of the communication pipe (510) away from the fixed box (501) is fixedly connected to the outside of the filter cylinder (508), a connecting pipe (511) is fixedly connected to the outside of the fixed box (501), the bottom of the connecting pipe (511) is fixedly connected to the top of the fixed pipe (401), an electric valve (512) is fixedly connected to the top of the connecting pipe (511), one end of the electric valve (512) away from the connecting pipe (511) is fixedly connected to a ventilation pipe (513), one end of the ventilation pipe (513) away from the electric valve (512) is fixedly connected to a filter head (514), the top of the filter head (514) is rotatably connected to the inner top end of the tail barrel (6), the bottom of the movable column (506) penetrates through the bottom of the connecting column (503), one end of the tension spring (504) is fixedly connected to the inside of the connecting column (503), and the other end of the tension spring (504) is fixedly connected to the top of the limit sliding disk (505).

6. The continuous production equipment for high-purity selenium dioxide according to claim 2, characterized in that, An inspection port (211) is provided on the outside of the high-temperature oxidation furnace (201), and a rotating door (212) is rotatably connected to the outside of the high-temperature oxidation furnace (201).

7. The continuous production equipment for high-purity selenium dioxide according to claim 2, characterized in that, A support frame (8) is fixedly connected to the bottom of the high-temperature oxidation furnace (201), and placement frames (7) are fixedly connected to the bottoms of the cooling and crystallization barrel (1) and the tail barrel (6).

8. The continuous production equipment for high-purity selenium dioxide according to claim 1, characterized in that, Sealed doors (9) are rotatably connected to the bottom sides of the cooling and crystallization barrel (1) and the tail barrel (6), and stainless steel pipes (10) are fixedly connected between the cooling and crystallization barrel (1) and the tail barrel (6) and the selenium dioxide production mechanism (2).

9. A continuous production device for high-purity selenium dioxide according to claim 4, characterized in that, One end of the thrust spring (408) is fixedly connected to one side of the perforated plate (407), and the other end of the thrust spring (408) is fixedly connected to the inside of the air outlet pipe (406).

10. A process for the continuous production of high-purity selenium dioxide, based on the high-purity selenium dioxide continuous production equipment described in claims 1-9, characterized in that, It includes the following production process steps: Step 1: The electromagnetic vibrating feeder feeds the raw materials in the silo into the buffer receiving basin (204) inside the high-temperature oxidation furnace (201) through the feeding pipeline (202), and uses the level gauge 1 (205) to slowly melt and gasify the raw materials in the buffer receiving basin (204) to produce gasified selenium dioxide. The feeding speed is fed back to the electromagnetic vibrating feeder through the level gauge signal in the feeding pipeline (202), which can make the selenium ore evenly enter the buffer receiving basin (204) inside the high-temperature oxidation furnace (201) and keep the inside of the feeding pipeline (202) always full of materials. Step 2: The gasified selenium dioxide in Step 1 enters the inside of the cooling and crystallization barrel (1) through the stainless steel pipe (10) between the cooling and crystallization barrel (1) and the high-temperature oxidation furnace (201) for cooling and crystallization. The cooled and crystallized selenium dioxide settles to the bottom of the crystallization barrel. When the level gauge 2 (208) after crystallization inside the cooling and crystallization barrel (1) reaches the position of the level gauge 2 (208), it is then stacked by the double-screw conveyor (206) and output from the inside of the cooling and crystallization barrel (1). Step 3: The air pressure generating mechanism (3), the gas on-off mechanism (4) and the air extraction and filtration mechanism (5) are used to form a negative pressure state inside the cooling and crystallization barrel (1), the tail barrel (6) and the high-temperature oxidation furnace (201), so as to prevent toxic gases from being discharged from the inside of the cooling and crystallization barrel (1), the tail barrel (6) and the high-temperature oxidation furnace (201).

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