Drying device for sulfuric acid production

Abstract

The invention provides a drying device for sulfuric acid production, and belongs to the technical field of drying. An inner drying cylinder capable of rotating is coaxially arranged in the outer drying cylinder; a plurality of blanking sieves are arranged on the peripheral wall of the inner drying cylinder, materials capable of passing through the blanking sieves in the inner drying cylinder enter the outer drying cylinder, a sieving baffle is arranged between every two blanking sieves, and the sieving baffles are in sliding connection with the side walls of the corresponding blanking sieves; the stirring assembly comprises a plurality of sliding grooves formed in the radial direction of the inner drying cylinder. The different requirements of ores with different particle sizes for drying conditions can be met, meanwhile, the dried ores move in the barrel while being turned over continuously, the outer surfaces of the ores can be evenly blown by hot air, and meanwhile the situation that large-particle ores are attached to the surface of a discharging screen to affect discharging can be avoided; and turbulent flow is generated in the inner drying cylinder through the spiral blades, and the drying effect in the inner drying cylinder is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of drying, and in particular to a drying device for sulfuric acid production. Background Art

[0002] In the industrial production of sulfuric acid, pyrite ore is the main source of raw materials. The processing of pyrite ore into sulfuric acid requires several key steps. The first is the roasting stage, where pyrite (the main component is FeS2) is put into a high-temperature roasting furnace and reacts violently in an environment with sufficient oxygen. The chemical reaction equation is 4FeS2+11O2=2Fe2O3+8SO2. During this process, the sulfur element in the 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. The purified sulfur dioxide enters the converter and is oxidized into sulfur trioxide under the action of a catalyst. The sulfur trioxide is introduced into the absorption tower and absorbed with concentrated sulfuric acid to produce a sulfuric acid product.

[0003] However, the ore mined from the mine often needs to be transported over long distances, during which it may be hit by rain. In addition, when stored in the open air or in simple warehouses, the pyrite ore will continue to absorb moisture from the air. When the ore containing water enters the roasting furnace, the evaporation of water will absorb a lot of heat, resulting in uneven temperature distribution in the furnace, making it difficult to maintain the stable high temperature environment required for the full decomposition of the pyrite, which in turn leads to incomplete reaction and reduced sulfur conversion rate. The traditional natural drying method requires a large amount of space and is restricted by the weather, resulting in a long drying cycle, which is difficult to meet the high efficiency requirements of modern large-scale sulfuric acid production.

[0004] Referring to the Chinese patent document with announcement number CN115077221B and announcement date July 16, 2024, entitled "A safe drying equipment for ore raw materials used in ore processing", mud blocks and pressure test blocks are used to remove mud blocks on the inner wall of the drying cylinder, and hot air is used through guide plates to dry the ore in different directions.

[0005] Referring to the above technical solution, when drying ores of different sizes, the requirements for drying conditions are different due to the different surface areas and heat transfer efficiencies of ores of different sizes. It is difficult to quickly discharge the internal moisture of large-particle ore, so longer drying time and higher temperature conditions are required. Small-particle ore has a small surface area and high heat transfer efficiency. Long-term high-temperature drying can easily lead to over-drying, which changes the physical structure of the pyrite ore, and may become loose and broken, producing more fine powder, which is not conducive to the subsequent roasting process. In addition, large pieces of pyrite ore are not conducive to uniform heat transfer, so it takes a long time for the external temperature to be transferred to below the surface of the iron ore, 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 problem that the drying requirements of ores with different particle sizes vary greatly, resulting in poor drying effect and low efficiency.

[0007] In order to solve the above technical problems, the present application provides a drying device for sulfuric acid production, comprising a frame and an outer drying cylinder horizontally arranged on the frame, wherein an air inlet is provided on the end face of the outer drying cylinder, an inner drying cylinder is coaxially arranged inside the outer drying cylinder, a feeding port is provided on one side of the inner drying cylinder, and an annular drying chamber is formed between the inner drying cylinder and the outer drying cylinder; a plurality of blanking screens are provided on the peripheral wall of the inner drying cylinder, and the materials in the inner drying cylinder that can pass through the blanking screens enter the annular drying chamber and are dried for a short time, and a screen baffle plate slidably connected to the side wall of the corresponding blanking screen is provided between adjacent blanking screens; a turning mechanism is provided in the inner drying cylinder, and the turning mechanism includes a stirring assembly and a guide assembly; the stirring assembly includes a plurality of sliding grooves radially opened in the inner drying cylinder, the position of each sliding groove is adapted to the position of the corresponding blanking screen, a sliding block is slidably connected in each sliding groove, and a rotatable spiral blade is rotatably connected to each sliding block; the guide assembly includes a fixed guide plate, and the guide plate drives the spiral blade to approach the blanking screen or to move away from the blanking screen.

[0008] By adopting the above technical scheme, when it is necessary to dry the iron ore, the iron ore is transported into the inner drying drum, and the small-sized ore entering the inner drying drum enters the annular drying chamber in the outer drying drum through the blanking screen, and is discharged after being dried for a short time; the large-sized material is retained in the inner drying drum by the blanking screen and is dried with hot air for a long time; the turning mechanism cooperates with the screen baffle through the spiral blades, so that the ore raw materials in the drum can be displaced in the drum while turning over, avoiding large-sized ore particles adhering to the surface of the blanking screen and causing interference with the material discharge, and at the same time, the ore raw materials can be turned over, so that the surface of the ore raw materials can be evenly blown by the hot air; the guide component drives the spiral blades to approach the blanking screen or away from the blanking screen, and when the spiral blades are away from the blanking screen, turbulence can be generated in the inner drying drum.

[0009] Optionally, a rotating sleeve is provided on the rotating shaft of the spiral blade, and the rotating sleeve can slide and abut against the guide plate, and a planetary gear is fixedly provided on the end surface of the rotating shaft of the spiral blade; a gear ring that can mesh with the planetary gear is provided in the outer drying cylinder.

[0010] Optionally, the upper half circle of the guide plate is a tooth surface that can mesh with the planetary gear, and the lower half circle is a guide surface that can abut against the rotating sleeve; the guide surface drives the spiral blade to slide along the sliding groove toward the gear ring through the rotating sleeve, and the corresponding planetary gear meshes with the gear ring.

[0011] By adopting the above technical scheme, the guide plate drives the spiral blade shaft to slide in the sliding groove through the rotating sleeve, which can avoid direct contact between the spiral blade shaft and the guide plate to cause wear and friction that reduces the transmission efficiency; the guide surface drives the spiral blade to slide along the sliding groove toward one side of the circumference of the inner drying cylinder, so that the corresponding planetary gear can mesh with the ring gear, so that 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 toward the center of the inner drying cylinder, so that the rotating spiral blade can disturb the air in the inner drying cylinder to make the air in the inner drying cylinder turbulent, so that the hot air can pass through the gaps between the ore raw materials and blow hot air on the ore surface.

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

[0013] Optionally, the end face of the inner drying cylinder is provided with multiple connecting rods; the end face of the outer drying cylinder is rotatably connected to a rotating disk, and the end faces of the multiple connecting rods are fixedly arranged on the end face of the rotating disk; the other end face of the rotating disk is provided with a hollow rotating shaft, and a bearing seat is fixedly arranged on the frame, and the rotating disk is rotatably connected to the bearing seat.

[0014] Optionally, a connecting frame is provided on the end surface of the guide plate, a support rod is provided on the connecting frame, a fixing rod is provided on one end surface of the support rod, and the support rod is fixedly connected to the bearing seat via the fixing rod.

[0015] By adopting the above technical scheme, the compression spring drives the sliding block to move along the sliding groove toward the axial direction of the inner drying cylinder. The elastic driving force applied to the sliding block by the compression spring enables the rotating sleeve of the spiral blade to be in close contact with the guide surface, or drives the sliding block to drive the sliding sleeve to move toward the center of the inner drying cylinder through the spiral blade, so that the planetary gear can be stably engaged 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, so that the guide disk can fully play the guiding role, avoiding the guiding deviation caused by the shaking of the guide disk, and then affecting the stable engagement of the planetary gear with the tooth surface or the gear ring.

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

[0017] Optionally, a lower hopper and a linear drive are provided on the frame, the output end of the linear drive is connected to the lower hopper, the linear drive drives the discharge end of the lower hopper to reciprocate in the inner drying cylinder, and a crushing mechanism for crushing ore is provided in the lower hopper, and the crushing mechanism includes a double-roll crusher.

[0018] By adopting the above technical scheme, the driving motor drives the driving wheel of the output shaft to rotate, and 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, and 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 the gear ring; when unloading, the linear drive drives the unloading hopper to perform reciprocating periodic motion, so that the unloading end of the unloading hopper continuously changes its position in the axial direction of the inner drying cylinder, so that the distribution of the unloading hopper in the inner drying cylinder is more uniform, avoiding the accumulation of ore inside the inner drying cylinder, causing local poor ventilation.

[0019] Optionally, the bottom surface of the frame on the side where the lower hopper is arranged is higher than the bottom surface of the symmetrical side; the peripheral wall of the outer drying cylinder close to the ground is respectively provided with a first discharge opening and a second discharge opening which can be opened and closed.

[0020] Optionally, a rotating ring is provided 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, the outward end face of the rotating ring is provided with a dovetail groove coaxial with the inner drying cylinder, the dovetail groove is slidably connected with a dovetail block, and the dovetail block is fixedly connected to the output end of the linear drive.

[0021] By adopting the above technical scheme, the tilting design of the frame allows the inner drying drum and the outer drying drum to tilt along with the frame. The tilting design allows the ore entering the outer drying drum to be discharged from the first discharge port through the inclined surface by its own weight after drying; by setting the rotating ring, the screen baffle can be driven by the linear drive while rotating to open the space between the blanking screens; when it is necessary to discharge the ore with large particle size, the second discharge port is opened, and the linear drive is used to drive multiple screen baffles to slide to the side away from the outer drying drum to open the space between the blanking screens; the driving motor drives the inner drying drum to rotate forward and reverse at a certain frequency, so that the material in the inner drying drum enters the outer drying drum through the space between the blanking screens, and then is 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: 1. Use the drop screen to classify the pyrite ore according to particle size. Small-size materials enter the outer drying drum for short-term drying and then are discharged, while large-size materials remain in the inner drying drum for long-term hot air drying, which meets the different requirements of different particle size ores for drying conditions and improves the drying efficiency.

[0023] 2. The spiral blades meshing with the gear ring of the turning mechanism cooperate with the reciprocating screen baffle to make the ore shift in the cylinder while turning over continuously. On the one hand, it prevents large particles of ore from adhering to the surface of the screen and affecting the material discharge, and on the other hand, the surface of the ore can be evenly blown by the hot air; and the spiral blades meshing with the tooth surface can also rotate at the center of the inner drying cylinder, which has a turbulent effect, so that the hot air can fully contact the surface of the ore, accelerate the evaporation of water, and improve the drying efficiency.

[0024] 3. The lower hopper and linear drive are installed on the frame. The crushing mechanism in the lower hopper crushes the ore raw materials, which increases the heating area of ​​the ore, allows the inside of the ore to be blown by hot air, and accelerates the heating speed of the ore; the linear drive drives the discharge end of the lower hopper to reciprocate in the inner drying cylinder, making the material distribution more uniform, avoiding the accumulation of ore inside the inner drying cylinder and causing local poor ventilation, ensuring the smooth progress of the drying process.

[0025] 4. The outer drying drum and the inner drying drum are arranged with the inclined frame, and the feeding side of the inner drying drum is higher than the opposite side. The first discharge port and the second discharge port are opened on the side of the outer drying drum wall close to the ground. The first discharge port allows the small-sized particles after drying to be discharged naturally by the inclined surface; when discharging, the second discharge port is opened, and the screen baffle is driven by the linear drive to slide to open the space between the drop screens, and then the inner drying drum is rotated forward and reversed at a certain frequency, so that the spiral blades can move the materials in the inner drying drum, so that the large-sized particles enter the outer drying drum through the drop screen and are discharged from the second discharge port. The whole discharge process is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a drying device for sulfuric acid production in this application; Figure 2 A schematic diagram of the structure of the guidance component of this application; Figure 3 A schematic diagram of the structure of the guiding component facing forward for this application; Figure 4 This is a schematic diagram of the structure of the drying drum in this application from a top view; Figure 5 This is a schematic diagram of the structure of the outer drying cylinder of this application from a top view; Figure 6 for Figure 5 Schematic diagram of the cross-section structure in the AA direction; Figure 7 This is a schematic diagram of the structure of the spiral blade of this application; Figure 8 for Figure 7 The enlarged structural diagram of the middle B part; Fig. 9 This is a structural diagram of another perspective of this application; Fig.10for Fig. 9 The enlarged structural diagram of the middle C part; Fig.11 This is a cross-sectional view of the screening baffle and chute for this application.

[0027] Explanation of the reference numerals: 1. frame; 11. bearing seat; 12. drive motor; 13. drive wheel; 14. transmission belt; 15. lower hopper; 16. linear drive; 2. outer drying cylinder; 21. air inlet; 22. gear ring; 23. rotating shaft; 24. transmission wheel; 25. first discharge port; 3. inner drying cylinder; 31. drop screen; 311. interface; 312. slide groove; 32. screen baffle; 33. connecting rod; 34. rotating ring; 35. dovetail groove; 36. dovetail block; 4. stirring assembly; 41. sliding groove; 42. sliding block; 43. spiral blade; 44. rotating sleeve; 45. planetary gear; 46. compression spring; 5. guide assembly; 51. guide plate; 52. guide surface; 53. tooth surface; 54. connecting frame; 55. support rod; 56. fixing rod. DETAILED DESCRIPTION

[0028] Reference Figure 1-Figure 11 The 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Reference Figure 7 A rotating sleeve 44 capable of abutting against the guide plate 51 is sleeved on the rotating shaft of each spiral blade 43, and a planetary gear 45 is fixedly provided on the end face of the rotating shaft of each spiral blade 43, and 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 provided in the outer drying cylinder 2, and 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 through the rotation of the inner drying cylinder 3, thereby driving the corresponding spiral blade 43 to rotate.

[0033] Reference Figure 2 and Figure 3 The upper half circle of the guide plate 51 is a tooth surface 53 that can mesh 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 through the rotation of the inner drying cylinder 3, thereby driving the corresponding spiral blade 43 to rotate; the lower half circle is a guide surface 52 that can abut against the rotating sleeve 44. The guide surface 52 is arranged on the outer circle of the tooth surface 53. The diameter of the guide surface 52 is larger than the tooth surface 53 to drive the corresponding spiral blade 43 to slide along the sliding groove 41 toward the side of the gear ring 22, so that the corresponding planetary gear 45 meshes with the gear ring 22, so that the corresponding spiral blade 43 can scrape the falling screen 31.

[0034] Reference Figure 3A compression spring 46 is arranged between the top wall of the sliding groove 41 and the side of the sliding block 42 away from the axis of the inner drying cylinder 3. 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. When the rotating sleeve 44 does not abut against the guide surface 52, the compression spring 46 drives the sliding block 42 to move to the side of 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, and the rotation of the spiral blade 43 has an effect on the sulfur in the inner drying cylinder 3. The iron ore is turned over so that the surface of the ore can be evenly blown by the hot air; the rotating sleeve 44 that does not abut against the guide surface 52, the compression spring 46 drives the planetary gear 45 to slide toward the tooth surface 53 and mesh with the tooth surface 53, so that the planetary gear 45 drives the spiral blade 43 to rotate, and the planetary gear 45 sliding toward 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, the rotation of the spiral blade 43 is used to make the hot air dry the moisture on the surface of the spiral blade 43.

[0035] Reference Figure 1 and Figure 3 The end face of the inner drying cylinder 3 is provided with multiple connecting rods 33; the end face of the outer drying cylinder 2 is rotatably connected with a rotating disk, and the end faces of multiple 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 multiple connecting rods 33; the other end face 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.

[0036] Reference Figure 2 A connecting frame 54 is provided on the end face of the guide plate 51, a support rod 55 is provided on the connecting frame 54, a fixing rod 56 is provided 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 plate 51 is fixedly connected to the bearing seat 11 through the support rod 55, so that the guiding effect of the guide plate 51 is more stable.

[0037] Reference Figure 1 A driving motor 12 is provided on the frame 1, and a driving wheel 13 is provided on the output shaft of the driving motor 12; a transmission wheel 24 is provided 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 rotating the inner drying drum 3.

[0038] Reference Figure 1A lower hopper 15 and a linear drive 16 are provided on the frame 1. 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, so that the material falling into the inner drying cylinder 3 is more evenly distributed; a crushing mechanism for crushing the ore is provided in the lower hopper 15. The crushing mechanism can adopt a double-roll crusher. The crushing mechanism crushes the ore raw material so that the inside of the ore can be blown by hot air, thereby accelerating the heating speed of the ore and allowing the moisture in the ore to be evaporated.

[0039] The bottom surface of the frame 1 arranged on one side of the lower 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 random frame 1, and the feeding side of the inner drying cylinder 3 is higher than the opposite side; the first discharge port 25 and the second discharge port that can be opened and closed are respectively provided on the side of the peripheral wall of the outer drying cylinder 2 close to the ground. The first discharge port 25 is used to discharge the small-sized particles after drying, and the second discharge port is used to discharge the large-sized particles after drying.

[0040] Reference Fig. 9 A rotating ring 34 is provided on the outer wall of the inner drying cylinder 3, and the end face of the 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 with a dovetail block 36, and the dovetail block 36 is fixedly connected to the output end of the linear drive 16.

[0041] The implementation principle of a drying device for sulfuric acid production in an embodiment of the present application is as follows: when it is necessary to dry the wet pyrite ore, hot air is first delivered to 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.

[0042] The ore raw materials are then poured into the lower hopper 15, and the crushing mechanism in the lower hopper 15 crushes the ore raw materials. The linear drive 16 drives the lower hopper 15 to reciprocate along the axis direction of the outer drying cylinder 2, so that the material entering the inner drying cylinder 3 is more evenly distributed.

[0043] The rotation of the inner drying cylinder 3 causes the rotating sleeve 44 of the spiral blade 43 located in the lower half of the inner drying cylinder 3 to abut against the guide surface 52, so that the planetary gear 45 corresponding to the spiral blade 43 meshes with the ring gear 22 and drives the spiral blade 43 to rotate. The rotation of the spiral blade 43 turns over the pyrite ore 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 away the material that cannot pass through the blanking screen 31, so as to avoid affecting other materials from passing through the blanking screen 31 and entering the outer drying cylinder 2.

[0044] At the same time, the rotating sleeve 44 of the spiral blade 43 located in the upper half of the inner drying cylinder 3 is no longer restricted by the guide surface 52, and the compression spring 46 drives the sliding block 42 to drive the spiral blade 43 to move toward the tooth surface 53, so that the planetary gear 45 is meshed with the tooth surface 53 and drives the corresponding spiral blade 43 to rotate. The rotating spiral blade 43 disturbs the hot air on the upper part of the inner drying cylinder 3, so that the hot air can pass through the gaps between the ore, so that the ore can be blown by more hot air; at the same time, the hot air can also blow away the moisture on the surface of the spiral blade 43, so that the spiral blade 43 can remain in a dry state.

[0045] When dropping materials, the linear drive 16 drives the rotating ring 34 and the lower hopper 15 to perform reciprocating motion, and the discharge end of the lower hopper 15 moves along the axis of the inner drying cylinder 3, so that the ore entering the inner drying cylinder 3 is distributed more thoroughly; at the same time, the rotating ring 34 drives multiple screening baffles 32 to perform reciprocating motion, and the screening baffle 32 is located on one side of the inner drying cylinder 3 and reciprocates with the ore raw materials in the inner drying cylinder 3, so that the ore raw materials can be turned over more thoroughly. At this time, the screening baffle 32 moves along the chute 312, but the screening baffle 32 does not move out of the chute 312. At this time, the material does not fall through the gap between the screening baffle 32 and the dropping screen 31.

[0046] When discharging is required, the second discharging port is opened first, and the linear drive 16 drives multiple screen baffles 32 to slide to the side away from the outer drying cylinder 2, so that the blanking screen 31 moves out of the slide chute 312; the driving motor 12 drives the inner drying cylinder 3 to rotate forward and reverse 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 screen baffle 32 and the blanking screen 31, and then is discharged through the second discharging 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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