A drying device for sulfuric acid production

Abstract

The present application provides a drying device for sulfuric acid production, belonging to the technical field of drying, which includes a frame and an outer drying cylinder; an inner drying cylinder capable of rotating is coaxially arranged inside the outer drying cylinder; a plurality of blanking sieves are arranged on the peripheral wall of the inner drying cylinder, and the materials that can pass through the blanking sieves inside the inner drying cylinder enter the outer drying cylinder. Between each blanking sieve is a screening baffle, and the screening baffle is slidably connected to the side wall of the corresponding blanking sieve; the stirring assembly includes a plurality of sliding grooves opened along the radial direction of the inner drying cylinder. The present application can meet the different requirements of ores with different particle sizes for drying conditions. At the same time, the ore to be dried undergoes displacement in the cylinder while being continuously turned over, so that the surface of the ore can be evenly blown by hot air, and at the same time, large-particle ores can be prevented from adhering to the surface of the blanking sieve and affecting the blanking; a turbulent flow is generated inside the inner drying cylinder by the spiral blades, further improving the drying effect inside the inner drying cylinder.

Description

Technical Field

[0001] This application relates to the technical field of drying, and specifically relates to a drying device for sulfuric acid production. Background Art

[0002] In the industrial production of sulfuric acid, pyrite ore is the main raw material source. Processing pyrite ore into sulfuric acid requires multiple key steps. First is the roasting process, where pyrite (mainly composed of FeS 2 2) is fed into a high-temperature roasting furnace and undergoes a violent reaction in an environment with sufficient oxygen. The chemical reaction equation is 4FeS 2 2 + 11O 2 2 = 2Fe 2 2O 3 3 + 8SO 2 2. During this process, the sulfur element in pyrite is converted into sulfur dioxide gas. The sulfur dioxide gas produced from the roasting furnace needs to be purified to remove impurities such as dust, arsenic, and selenium mixed in it. The purified sulfur dioxide enters a converter, where it is oxidized to sulfur trioxide under the action of a catalyst. The sulfur trioxide is introduced into an absorption tower and absorbed with concentrated sulfuric acid to obtain sulfuric acid products.

[0003] However, the ore mined from the mine often needs to be transported over a long distance, during which it may be affected by rain, and when stored in the open air or in a simple warehouse, the pyrite ore will continuously absorb moisture in the air. When the ore containing moisture enters the roasting furnace, the evaporation of moisture will absorb a large amount of heat, resulting in uneven temperature distribution in the furnace and making it difficult to maintain a stable high-temperature environment required for the full decomposition of pyrite, thereby leading to incomplete reactions and a decrease in the sulfur conversion rate. The traditional natural drying method requires a large amount of space and is restricted by the weather, resulting in an overly long drying cycle and being difficult to meet the high-efficiency requirements of modern large-scale sulfuric acid production.

[0004] Referring to the Chinese patent document with the publication number CN115077221B, the publication date of July 16, 2024, and the name of an ore raw material safety drying device for ore processing, it uses a shoveling block and a pressure testing block to remove the mud blocks on the inner wall of the drying cylinder, and the hot air dries the ore in different directions through the guide vanes.

[0005] Referring to the above technical solution, when drying ores of different sizes, due to the different surface areas and heat transfer efficiencies of ores of different sizes, the requirements for drying conditions are also different. It is difficult for the internal moisture of large-grained ores to be quickly discharged, so longer drying time and higher temperature are required. Small-grained ores have a small surface area and high heat transfer efficiency. Long-time high-temperature drying is likely to cause over-drying, which may change the physical structure of pyrite ores, making them loose and broken, generating more fine powders, and thus being unfavorable for the subsequent roasting process. In addition, large pieces of pyrite ores are not conducive to uniform heat transfer, so it takes a long time for the external temperature to conduct to below the surface of the iron ores, resulting in low drying efficiency. Summary of the Invention

[0006] In view of this, the present application provides a drying device for sulfuric acid production, which is used to solve the problems of poor drying effect and low efficiency caused by large differences in drying requirements for ores of different particle sizes.

[0007] To solve the above technical problems, the present application provides a drying device for sulfuric acid production, including a frame and an outer drying cylinder horizontally arranged on the frame. An air inlet is provided at the end face of the outer drying cylinder. An inner drying cylinder is coaxially and rotatably arranged inside the outer drying cylinder. A feed inlet is provided on one side of the inner drying cylinder. An annular drying chamber is formed between the inner drying cylinder and the outer drying cylinder. A plurality of blanking sieves are arranged on the peripheral wall of the inner drying cylinder. The materials that can pass through the blanking sieves in the inner drying cylinder enter the annular drying chamber in the outer drying cylinder and are dried for a short time. A sieve material baffle is arranged between adjacent blanking sieves and is slidably connected to the side wall of the corresponding blanking sieve. A turning mechanism is arranged inside the inner drying cylinder. The turning mechanism includes a stirring component and a guiding component. The stirring component includes a plurality of sliding grooves radially opened along the inner drying cylinder. The position of each sliding groove is adapted to the position of the corresponding blanking sieve. A sliding block is slidably connected in each sliding groove. A rotatable spiral blade is rotatably connected to each sliding block. The guiding component includes a fixed guiding disk, and the guiding disk drives the spiral blade to be close to or away from the blanking sieve.

[0008] By adopting the above technical solution, when it is necessary to dry iron ores, the iron ores are conveyed into the inner drying cylinder. The small-particle-size ores entering the inner drying cylinder enter the annular drying chamber in the outer drying cylinder through the blanking sieves and are discharged after short-time drying. The large-particle-size materials are retained in the inner drying cylinder by the blanking sieves and are dried by hot air for a long time. The turning mechanism cooperates with the spiral blade and the sieve material baffle, so that the ore raw materials in the cylinder can be turned over and displaced in the cylinder at the same time, avoiding the interference of large-particle ores adhering to the surface of the blanking sieve during blanking, and at the same time enabling the ore raw materials to be turned over, so that the outer surface of the ore raw materials can be evenly blown by hot air. The guiding component drives the spiral blade to be close to or away from the blanking sieve. When the spiral blade is away from the blanking sieve, a turbulent flow can be generated in the inner drying cylinder.

[0009] Optionally, a rotating sleeve is sleeved on the rotating shaft of the spiral blade. The rotating sleeve can slidably abut against the guiding disc. A planetary gear is fixedly arranged on the end face of the rotating shaft of the spiral blade. A toothed ring capable of meshing with the planetary gear is arranged in the outer drying cylinder.

[0010] Optionally, the upper half of the guiding disc is a tooth surface capable of meshing with the planetary gear, and the lower half is a guiding surface capable of abutting against the rotating sleeve. The guiding surface drives the spiral blade to slide along the sliding groove towards the toothed ring through the rotating sleeve, and the corresponding planetary gear meshes with the toothed ring.

[0011] By adopting the above technical solution, the guiding disc drives the rotating shaft of the spiral blade to slide in the sliding groove through the rotating sleeve, which can avoid the direct contact between the rotating shaft of the spiral blade and the guiding disc, causing wear and friction and reducing the transmission efficiency. The guiding surface drives the spiral blade to slide along the sliding groove towards the circumferential side of the inner drying cylinder, so that the corresponding planetary gear can mesh with the toothed ring, and the rotating spiral blade can clean the surface of the blanking screen. When the corresponding planetary gear meshes with the tooth surface, the corresponding spiral blade slides towards the center of the inner drying cylinder, so that the rotating spiral blade can disturb the air in the inner drying cylinder and make the air in the inner drying cylinder disordered, so that the hot air can pass through the gaps between the ore raw materials and blow hot air on the surface of the ore.

[0012] Optionally, a compression spring is arranged between the top wall of the sliding groove and the side of the sliding block away from the axis of the inner drying cylinder. The compression spring provides an elastic driving force towards the central axis of the inner drying cylinder for the sliding block.

[0013] Optionally, a plurality of connecting rods are arranged on the end face of the inner drying cylinder. A rotating disc is rotatably connected to the end face of the outer drying cylinder. The end faces of the plurality of connecting rods are fixedly arranged on the end face of the rotating disc. A hollow rotating shaft is arranged on the other end face of the rotating disc. A bearing seat is fixedly arranged on the frame, and the rotating disc is rotatably connected to the bearing seat.

[0014] Optionally, a connecting frame is arranged on the end face of the guiding disc. A support rod is arranged on the connecting frame. A fixing rod is arranged on one end face of the support rod. The support rod is fixedly connected to the bearing seat through the fixing rod.

[0015] By adopting the above technical solution, the compression spring drives the sliding block to move along the sliding groove towards the axis direction of the drying cylinder. The elastic driving force exerted by the compression spring on the sliding block enables the rotating sleeve of the spiral blade to closely adhere to the guiding surface, or drives the sliding block to drive the sliding sleeve to move towards the center direction of the drying cylinder through the spiral blade, so that the planetary gear can stably mesh with the tooth surface; the rotating disk drives the inner drying cylinder to rotate through the connecting rod, and the rotating inner drying cylinder can turn over the ore raw materials in the cylinder; the rotating disk is arranged on the frame through the bearing seat, enabling the guiding disk to fully play the guiding role, avoiding guiding deviation caused by the shaking of the guiding disk, and further affecting the stable meshing of the planetary gear with the tooth surface or the tooth ring.

[0016] Optionally, a driving motor is arranged on the frame, and a driving wheel is arranged on the output shaft of the driving motor; a transmission wheel is arranged on the rotating shaft, and the driving wheel and the transmission wheel are connected by a transmission belt.

[0017] Optionally, a feeding hopper and a linear driver are arranged on the frame, the output end of the linear driver is connected to the feeding hopper, the linear driver drives the discharging end of the feeding hopper to reciprocate in the inner drying cylinder, and a crushing mechanism for crushing ore is arranged in the feeding hopper, and the crushing mechanism includes a pair-roll crusher.

[0018] By adopting the above technical solution, the driving motor drives the driving wheel on the output shaft to rotate, the driving wheel drives the transmission wheel to rotate through the transmission belt, and then the transmission wheel drives the rotating disk to rotate through the rotating shaft. The rotating disk drives the inner drying cylinder to rotate through multiple connecting rods, so that the ore in the inner drying cylinder can be turned over, and at the same time, the planetary gear can mesh with the tooth surface or mesh with the tooth ring; during feeding, the linear driver drives the feeding hopper to perform reciprocating periodic motion, so that the feeding end of the feeding hopper continuously changes its position in the axial direction of the inner drying cylinder, thereby making the feeding of the feeding hopper in the inner drying cylinder more uniform and avoiding the accumulation of ore inside the inner drying cylinder, resulting in poor local ventilation.

[0019] Optionally, the bottom surface of the frame on the side where the feeding hopper is arranged is higher than the bottom surface of the symmetric side; the first discharge port and the openable and closable second discharge port are respectively arranged on the peripheral wall of the outer drying cylinder near the ground side.

[0020] Optionally, a rotating ring is arranged on the outer wall of the inner drying cylinder, the end face of the screening baffle is fixedly connected to the end face of the rotating ring, a dovetail groove coaxial with the inner drying cylinder is arranged on the outer end face of the rotating ring, a dovetail block is slidably connected to the dovetail groove, and the dovetail block is fixedly connected to the output end of the linear driver.

[0021] By adopting the above technical solution, the inclined design of the rack enables the inner drying cylinder and the outer drying cylinder to incline along with the rack. With the inclined design, the ore entering the outer drying cylinder can be discharged from the first discharge port by its own weight through the inclined plane after drying; through the setting of the rotating ring, the screening baffle can be driven by the linear actuator while rotating, opening the space between the material falling sieves; when it is necessary to discharge the ore with large particle size, the second discharge port is opened, and the linear actuator drives a plurality of screening baffles to slide away from the outer drying cylinder side, opening the space between the material falling sieves; the driving motor drives the inner drying cylinder to rotate forward and backward at a certain frequency, so that the material in the inner drying cylinder enters the outer drying cylinder through the space between the material falling sieves and is then discharged through the second discharge port.

[0022] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The sulfur iron ore is classified by particle size using the material falling sieves. The small particle size material enters the outer drying cylinder for short-time drying and then is discharged, while the large particle size material remains in the inner drying cylinder to receive long-time hot air drying, meeting the different drying condition requirements of ores with different particle sizes and improving the drying efficiency.

[0024] 2. The spiral blade meshing and rotating with the turning mechanism and the reciprocating screening baffle cooperate to displace the ore in the cylinder while continuously turning it over. On the one hand, it avoids large particle ores from adhering to the surface of the material falling sieve and affecting the material discharge, and on the other hand, it enables the outer surface of the ore to be evenly blown by the hot air; moreover, the spiral blade meshing and rotating with the tooth surface can also rotate at the center of the inner drying cylinder, playing a role in disturbing the flow, enabling the hot air to fully contact the surface of the ore, accelerating the evaporation of moisture, and enhancing the drying efficiency.

[0025] 3. The feeding hopper and the linear actuator are arranged on the rack, and the crushing mechanism arranged in the feeding hopper crushes the ore raw material, increasing the heat absorption area of the ore, enabling the inside of the ore to be blown by the hot air, and accelerating the heating speed of the ore; the linear actuator drives the discharge end of the feeding hopper to reciprocate in the inner drying cylinder, making the cloth more uniform, avoiding the accumulation of ore inside the inner drying cylinder resulting in local poor ventilation, and ensuring the smooth progress of the drying process.

[0026] 4. The outer drying cylinder and the inner drying cylinder are arranged along with the inclined rack, and the feeding side of the inner drying cylinder is higher than the opposite side. The first discharge port and the second discharge port are opened on the side of the outer drying cylinder circumference close to the ground. The first discharge port can enable the dried small particle size material to be naturally discharged using the inclined plane; when discharging, the second discharge port is opened, the screening baffle is driven by the linear actuator to slide and open the space between the material falling sieves, and then the inner drying cylinder rotates forward and backward at a certain frequency, enabling the spiral blade to stir the material in the inner drying cylinder, so that the large particle size material enters the outer drying cylinder through the material falling sieves and is discharged through the second discharge port. The entire discharge process is simple and efficient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a drying device for sulfuric acid production in this application;

[0028] Figure 2 This is a schematic structural diagram of the guiding component in this application;

[0029] Figure 3 This is a schematic front view structural diagram of the guiding component in this application;

[0030] Figure 4 This is a schematic top view structural diagram of the inner drying cylinder in this application;

[0031] Figure 5 This is a schematic top view structural diagram of the outer drying cylinder in this application;

[0032] Figure 6 is Figure 5 The sectional structural diagram in the A - A direction in

[0033] Figure 7 This is a schematic structural diagram of the spiral blade in this application;

[0034] Figure 8 is Figure 7 The enlarged structural diagram of part B in

[0035] Figure 9 This is a schematic structural diagram of another perspective in this application;

[0036] Figure 10 is Figure 9 The enlarged structural diagram of part C in

[0037] Figure 11 This is a cross - sectional view of the screening baffle and the chute in this application.

[0038] Explanation of reference numerals: 1. Frame; 11. Bearing seat; 12. Driving motor; 13. Driving wheel; 14. Transmission belt; 15. Hopper; 16. Linear actuator; 2. Outer drying cylinder; 21. Air inlet; 22. Tooth ring; 23. Rotating shaft; 24. Transmission wheel; 25. First discharge port; 3. Inner drying cylinder; 31. Falling material sieve; 311. Interface; 312. Chute; 32. Screening baffle; 33. Connecting rod; 34. Rotating ring; 35. Dovetail groove; 36. Dovetail block; 4. Stirring component; 41. Sliding groove; 42. Sliding block; 43. Spiral blade; 44. Rotating sleeve; 45. Planetary gear; 46. Compression spring; 5. Guiding component; 51. Guiding disc; 52. Guiding surface; 53. Tooth surface; 54. Connecting frame; 55. Support rod; 56. Fixed rod. Detailed implementation manners

[0039] Refer to Figures 1-11The present embodiment provides a drying device for sulfuric acid production, including a frame 1, an outer drying cylinder 2 fixedly lying on the frame 1, and an inner drying cylinder 3 coaxially arranged inside the outer drying cylinder 2; a double-roll crusher for crushing ore is arranged in the lower hopper 15, and the discharge end of the lower hopper 15 is connected with the inner cavity of the inner drying cylinder 3; an annular drying chamber is formed between the inner drying cylinder 3 and the outer drying cylinder 2, and the annular drying chamber is used to accommodate small-size materials entering through the drop screen 31 and perform short-time drying.

[0040] An air inlet 21 is provided on the end face of the outer drying cylinder 2, and the air inlet 21 is connected to a hot air source for blowing hot air to the pyrite inside the outer drying cylinder 2. The hot air source may be waste heat generated during the high-temperature roasting process of the pyrite ore. A rotatable inner drying cylinder 3 is coaxially arranged inside the outer drying cylinder 2, and a feed port is provided on one end face of the inner drying cylinder 3. The rotating inner drying cylinder 3 enables the ore entering the inner drying cylinder 3 to tumble. A plurality of blanking screens 31 are provided on the peripheral wall of the inner drying cylinder 3, and a screen baffle 32 is provided between adjacent blanking screens 31, and the screen baffle 32 is slidably connected to the side wall of the corresponding blanking screen 31. The blanking screen 31 is provided with a chute 312 at the interface 311 with the screen baffle 32, and the screen baffle 32 is slidably connected with the chute 312. When the screen baffle 32 enters the chute 312, the pyrite ore in the inner drying cylinder 3 is blocked by the screen baffle 32, and the small-size materials in the inner drying cylinder 3 enter the outer drying cylinder 2 through the blanking screen 31, and the materials in the inner drying cylinder 3 that cannot pass through the blanking screen 31 are blocked by the blanking screen 31 and enter the inner drying cylinder 3; when the screen baffle 32 moves out of the chute 312, the ore can flow out from the gap between the screen baffle 32 and the blanking screen 31.

[0041] Reference Figure 6 A turning mechanism is arranged in the outer drying cylinder 2, and the turning mechanism includes a stirring assembly 4 and a guide assembly 5; the stirring assembly 4 includes a plurality of sliding grooves 41 radially opened along the inner drying cylinder 3, each sliding groove 41 is slidably connected with a sliding block 42, and each sliding block 42 is rotatably connected with a rotatable spiral blade 43; the guide assembly 5 includes a fixed guide plate 51, and the guide plate 51 drives the spiral blade 43 to approach the blanking screen 31 or to move away from the blanking screen 31.

[0042] In this embodiment, when the ore enters the rotating inner drying cylinder 3 through the feed port, the drop screen 31 divides the pyrite ore into large-size materials and small-size materials, and the small-size materials enter the outer drying cylinder 2 for drying through the drop screen 31; at the same time, the rotating spiral blades 43 cooperate with the rotating inner drying cylinder 3 by stirring the ore in the inner drying cylinder 3, so that the ore can be turned over, and then the outer surface of the ore can be fully blown by the hot air; through the setting of the spiral stirring blades, the surface of the drop screen 31 can also be scraped in time, and the ore that cannot pass through the drop screen 31 can be removed in time, so as to avoid the ore on the surface of the drop screen 31 affecting the passage of small-size materials.

[0043] Referring to Figure 7 , a rotating sleeve 44 capable of abutting against the guide disk 51 is sleeved on the rotating shaft of each spiral blade 43, and a planetary gear 45 is fixedly arranged on the end face of the rotating shaft of each spiral blade 43. The spiral blade 43 can be rotated by the rotation of the planetary gear 45; a gear ring 22 capable of meshing with the planetary gear 45 is arranged in the outer drying cylinder 2. When the planetary gear 45 meshes with the gear ring 22, the planetary gear 45 meshing with the gear ring 22 can rotate around its own axis by the rotation of the inner drying cylinder 3, thereby driving the corresponding spiral blade 43 to rotate.

[0044] Referring to Figure 2 and Figure 3 , the upper half of the guide disk 51 is a tooth surface 53 capable of meshing with the planetary gear 45. When the tooth surface 53 meshes with the planetary gear 45, the planetary gear 45 meshing with the tooth surface 53 can rotate around its own axis by the rotation of the inner drying cylinder 3, thereby driving the corresponding spiral blade 43 to rotate; the lower half is a guide surface 52 capable of abutting against the rotating sleeve 44. The guide surface 52 is arranged on the outer ring of the tooth surface 53, and the diameter of the guide surface 52 is larger than that of the tooth surface 53 to drive the corresponding spiral blade 43 to slide along the sliding groove 41 towards the side of the gear ring 22, so that the corresponding planetary gear 45 meshes with the gear ring 22, thereby enabling the corresponding spiral blade 43 to scrape the blanking screen 31.

[0045] Referring to Figure 3 , a compression spring 46 is arranged between the top wall of the sliding groove 41 and the surface of the sliding block 42 away from the axis of the inner drying cylinder 3. The compression spring 46 provides an elastic driving force for the sliding block 42 towards the central axis direction of the inner drying cylinder 3. When the rotating sleeve 44 does not abut against the guide surface 52, the compression spring 46 drives the sliding block 42 to move towards the tooth surface 53, so that the planetary gear 45 meshes with the tooth surface 53; when the rotating sleeve 44 abuts against the guide surface 52, the inner wall of the blanking screen 31 is scraped. The planetary gear 45 meshes with the gear ring 22 and drives the spiral blade 43 to rotate. The rotation of the spiral blade 43 turns the iron pyrite ore in the inner drying cylinder 3, so that the surface of the ore can be evenly blown by the hot air; for the rotating sleeve 44 that does not abut against the guide surface 52, the compression spring 46 drives the planetary gear 45 to slide towards the tooth surface 53 and mesh with the tooth surface 53. Thus, the planetary gear 45 drives the spiral blade 43 to rotate. The planetary gear 45 sliding towards the tooth surface 53 drives the spiral blade 43 closer to the center position of the inner drying cylinder 3. The rotating spiral blade 43 can disturb the hot air in the inner drying cylinder 3, so that the hot air can fully contact the surface of the ore. At the same time, by using the rotation of the spiral blade 43, the hot air dries the moisture on the surface of the spiral blade 43.

[0046] Referring toFigure 1 and Figure 3 , a plurality of connecting rods 33 are arranged on the end face of the inner drying cylinder 3; a rotating disk is rotatably connected to the end face of the outer drying cylinder 2, and the end faces of the plurality of connecting rods 33 are fixedly arranged on the end face of the rotating disk. The rotation of the rotating disk drives the inner drying cylinder 3 to rotate through the plurality of connecting rods 33; a hollow rotating shaft 23 is arranged on the other end face of the rotating disk, and a bearing seat 11 is fixedly arranged on the frame 1. The rotating disk is rotatably connected to the bearing seat 11.

[0047] Referring to Figure 2 , a connecting frame 54 is arranged on the end face of the guide disk 51, a support rod 55 is arranged on the connecting frame 54, a fixing rod 56 is arranged on one end face of the support rod 55, the support rod 55 extends outward from the inner cavity of the rotating shaft 23, and the support rod 55 is fixedly connected to the bearing seat 11 through the fixing rod 56; the guide disk 51 is fixedly connected to the bearing seat 11 through the support rod 55, making the guiding function of the guide disk 51 more stable.

[0048] Referring to Figure 1 , a driving motor 12 is arranged on the frame 1, and a driving wheel 13 is arranged on the output shaft of the driving motor 12; a transmission wheel 24 is arranged on the rotating shaft 23, and the driving wheel 13 and the transmission wheel 24 are connected by a transmission belt 14; the driving motor 12 drives the driving wheel 13 to rotate, and the driving wheel 13 drives the rotating shaft 23 to rotate through the transmission belt 14, thereby driving the inner drying cylinder 3 to rotate.

[0049] Referring to Figure 1 , a feeding hopper 15 and a linear actuator 16 are arranged on the frame 1, the output end of the linear actuator 16 is connected to the feeding hopper 15, and the linear actuator 16 drives the discharging end of the feeding hopper 15 to reciprocate in the inner drying cylinder 3, making the material falling into the inner drying cylinder 3 more evenly distributed; a crushing mechanism for crushing the ore is arranged in the feeding hopper 15. The crushing mechanism can adopt a pair-roll crusher. The crushing mechanism crushes the ore raw material, enabling the inside of the ore to be blown by hot air, thereby accelerating the heating speed of the ore and enabling the moisture in the ore to be evaporated.

[0050] The bottom surface of the frame 1 on one side of the feeding hopper 15 is higher than the bottom surface of the symmetrical side. Through the inclined design, the outer drying cylinder 2 and the inner drying cylinder 3 are inclined along with the frame 1, and the feeding side of the inner drying cylinder 3 is higher than the relative side; first discharge ports 25 and openable and closable second discharge ports are respectively arranged on the peripheral wall of the outer drying cylinder 2 near the ground side. The first discharge ports 25 are used for discharging the dried small-particle-size materials, and the second discharge ports discharge the dried large-particle-size materials.

[0051] Referring to Figure 9, a rotating ring 34 is provided on the outer wall of the inner drying cylinder 3. The end face of the screening baffle 32 is fixedly connected to the end face of the rotating ring 34. A dovetail groove 35 coaxial with the inner drying cylinder 3 is provided on the outer end face of the rotating ring 34. A dovetail block 36 is slidably connected to the dovetail groove 35, and the dovetail block 36 is fixedly connected to the output end of the linear actuator 16.

[0052] The implementation principle of the drying device for sulfuric acid production in the embodiment of the present application is as follows: When it is necessary to dry the wet iron pyrite, first, hot air is conveyed into the outer drying cylinder 2 through the air inlet 21, and then the drive motor 12 is started. The drive motor 12 drives the rotating shaft 23 to rotate through the transmission belt 14, and the rotating shaft 23 then drives the inner drying cylinder 3 to rotate through the rotating disk.

[0053] Then, the ore raw materials are poured into the feeding hopper 15, and the crushing mechanism in the feeding hopper 15 crushes the ore raw materials. The linear actuator 16 drives the feeding hopper 15 to reciprocate along the axis direction of the outer drying cylinder 2, so that the materials entering the inner drying cylinder 3 are more evenly distributed.

[0054] The rotation of the inner drying cylinder 3 causes the rotating sleeve 44 of the spiral blade 43 in the lower half circle of the inner drying cylinder 3 to abut against the guiding surface 52, so that the planetary gear 45 of the corresponding spiral blade 43 meshes with the tooth ring 22 and drives the spiral blade 43 to rotate. The rotation of the spiral blade 43 tumbles the iron pyrite at the bottom of the inner drying cylinder 3, so that the surface of the ore can be evenly blown by the hot air; at the same time, the rotating spiral blade 43 can also push aside the materials that cannot pass through the blanking screen 31, avoiding affecting other materials from passing through the blanking screen 31 and entering the outer drying cylinder 2.

[0055] At the same time, the rotating sleeve 44 of the spiral blade 43 in the upper half circle of the inner drying cylinder 3 is no longer restricted by the guiding surface 52. The compression spring 46 drives the sliding block 42 to drive the spiral blade 43 to move towards the tooth surface 53 side, so that the planetary gear 45 meshes with the tooth surface 53 and drives the corresponding spiral blade 43 to rotate. The rotating spiral blade 43 turbulates the hot air in the upper part of the inner drying cylinder 3, so that the hot air can pass through the gaps between the ores, so that the ores can be blown by more hot air; at the same time, the hot air can also blow off the moisture on the surface of the spiral blade 43, so that the spiral blade 43 can maintain a dry state.

[0056] When blanking, the linear drive 16 drives the rotating ring 34 and the blanking hopper 15 to reciprocate. The discharge end of the blanking hopper 15 moves along the axis of the inner drying cylinder 3, making the ore entering the inner drying cylinder 3 more thoroughly distributed. At the same time, the rotating ring 34 drives a plurality of screening baffles 32 to reciprocate. The screening baffles 32 are located on one side of the inner drying cylinder 3 and reciprocally rub against the ore raw materials in the inner drying cylinder 3, enabling the ore raw materials to be turned over more thoroughly. At this time, the screening baffles 32 move along the chute 312, but the screening baffles 32 do not move out of the chute 312, and the material does not fall through the gap between the screening baffles 32 and the blanking screen 31 at this time.

[0057] When discharging is required, first open the second discharge port, and drive a plurality of screening baffles 32 to slide away from the outer drying cylinder 2 side by the linear drive 16, so that the blanking screen 31 moves out of the chute 312; the drive motor 12 drives the inner drying cylinder 3 to rotate forward and backward at a certain frequency, so that the material in the inner drying cylinder 3 enters the outer drying cylinder 2 through the gap between the screening baffles 32 and the blanking screen 31, and then is discharged through the second discharge port.

Claims

1. A drying device for sulfuric acid production, comprising a frame (1) and an outer drying cylinder (2) disposed horizontally on the frame (1), characterized in that: An air inlet (21) is provided on the end surface of the outer drying cylinder (2); an inner drying cylinder (3) is coaxially rotatably arranged inside the outer drying cylinder (2); a material feed port is arranged on one side of the inner drying cylinder (3); an annular drying chamber is formed between the inner drying cylinder (3) and the outer drying cylinder (2); a plurality of material drop screens (31) are arranged on the peripheral wall of the inner drying cylinder (3); materials in the inner drying cylinder (3) that can pass through the material drop screens (31) enter the annular drying chamber and are dried for a short time; and a screen baffle (32) is arranged between adjacent material drop screens (31) and is slidably connected to the side walls of the corresponding material drop screens (31); A turning mechanism is arranged inside the inner drying cylinder (3), and the turning mechanism comprises a stirring assembly (4) and a guide assembly (5); the stirring assembly (4) comprises a plurality of sliding grooves (41) radially arranged on the inner drying cylinder (3), the position of each sliding groove (41) being adapted to the position of a corresponding blanking screen (31), each sliding groove (41) being slidably connected to a sliding block (42), and each sliding block (42) being rotatably connected to a rotatable spiral blade (43); the guide assembly (5) comprises a fixedly arranged guide plate (51), and the guide plate (51) drives the spiral blade (43) to approach the blanking screen (31) or to move away from the blanking screen (31).

2. A drying device for sulfuric acid production according to claim 1, characterized in that: A rotating sleeve (44) is sleeved on the rotating shaft of the spiral blade (43), and the rotating sleeve (44) can be slidably abutted against the guide plate (51). A planetary gear (45) is fixedly arranged on the end surface of the rotating shaft of the spiral blade (43); and a gear ring (22) capable of meshing with the planetary gear (45) is arranged in the outer drying cylinder (2).

3. A drying device for sulfuric acid production according to claim 2, characterized in that: The upper half of the guide plate (51) is a tooth surface (53) capable of meshing with the planetary gear (45), and the lower half is a guide surface (52) capable of abutting against the rotating sleeve (44); the guide surface (52) drives the spiral blade (43) to slide along the sliding groove (41) toward the gear ring (22) through the rotating sleeve (44), and the corresponding planetary gear (45) meshes with the gear ring (22).

4. A drying device for sulfuric acid production according to claim 2, characterized in that: A compression spring (46) is provided between the top wall of the sliding groove (41) and a side of the sliding block (42) away from the axis of the inner drying cylinder (3), and the compression spring (46) provides an elastic driving force to the sliding block (42) in the direction of the central axis of the inner drying cylinder (3).

5. A drying device for sulfuric acid production according to claim 2, characterized in that: The end surface of the inner drying cylinder (3) is provided with a plurality of connecting rods (33); the end surface of the outer drying cylinder (2) is rotatably connected to a rotating disk, and the end surfaces of the plurality of connecting rods (33) are fixedly arranged on the end surface of the rotating disk; the other end surface of the rotating disk is provided with a hollow rotating shaft (23), and a bearing seat (11) is fixedly arranged on the frame (1), and the rotating disk is rotatably connected to the bearing seat (11).

6. A drying device for sulfuric acid production according to claim 2, characterized in that: A connecting frame (54) is provided on the end surface of the guide plate (51), a supporting rod (55) is provided on the connecting frame (54), a fixing rod (56) is provided on one end surface of the supporting rod (55), and the supporting rod (55) is fixedly connected to the bearing seat (11) via the fixing rod (56).

7. A drying device for sulfuric acid production according to claim 5, characterized in that: The frame (1) is provided with a driving motor (12), and the output shaft of the driving motor (12) is provided with a driving wheel (13); the rotating shaft (23) is provided with a transmission wheel (24), and the driving wheel (13) and the transmission wheel (24) are connected via a transmission belt (14).

8. A drying device for sulfuric acid production according to claim 2, characterized in that: The frame (1) is provided with a lower hopper (15) and a linear drive (16), the output end of the linear drive (16) is connected to the lower hopper (15), the linear drive (16) drives the discharge end of the lower hopper (15) to reciprocate in the inner drying cylinder (3), and a crushing mechanism for crushing ore is provided in the lower hopper (15), and the crushing mechanism includes a double-roll crusher.

9. A drying device for sulfuric acid production according to claim 2, characterized in that: The bottom surface of the frame (1) disposed on one side of the lower hopper (15) is higher than the bottom surface of the symmetrical side; the peripheral wall of the outer drying cylinder (2) is provided with a first discharge opening (25) and a second discharge opening that can be opened and closed on the side close to the ground.

10. A drying device for sulfuric acid production according to claim 1, characterized in that: The outer wall of the inner drying cylinder (3) is provided with a rotating ring (34), the end face of each screening baffle (32) is fixedly connected to the end face of the rotating ring (34), the outward end face of the rotating ring (34) is provided with a dovetail groove (35) coaxial with the inner drying cylinder (3), the dovetail groove (35) is slidably connected to a dovetail block (36), and the dovetail block (36) is fixedly connected to the output end of the linear drive (16).

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