Tailing acid pickling, absorbing and feeding device and working method thereof

Abstract

The invention discloses a tailing acid pickling, absorbing and feeding device and a working method thereof, and relates to the technical field of feeding equipment. The tailing acid pickling absorption feeding device comprises a feeding tank, a rotating shaft arranged in the middle of the feeding tank, at least one set of conveying cylinders arranged in the circumferential direction of the rotating shaft, conveying screws arranged in the conveying cylinders, a smashing cylinder arranged at a discharging opening in the bottom of the conveying cylinders, two sets of smashing rollers arranged in the smashing cylinder and a screening net hopper arranged at a discharging opening in the bottom of the smashing cylinder. And the grinding cylinder is arranged in the middle of the conical bottom of the screening net hopper, and a first grinding roller and a second grinding roller are sequentially arranged in the grinding cylinder from top to bottom. The tailings are fed in a dispersed state through spiral quantitative feeding of the tailings and circumferential spreading after smashing, then the smashed tailings are subjected to vibration screening, unqualified tailings are ground and smashed again, the tailings are conveyed and fed in a quantitative and uniform smashing state, and continuous, stable and comprehensive combined acid pickling absorption treatment is carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of feeding equipment, and particularly to a tail slag pickling absorption feeding device and its working method. Background Art

[0002] During the preparation of hydrogen fluoride in the inorganic fluoride salt industry, tail slag (by-product fluorogypsum) is generated. Since the tail slag contains hydrogen fluoride gas and sulfuric acid and has an irritating odor, it pollutes the surrounding green vegetation and the on-site environment. Therefore, after the preparation of hydrogen fluoride is completed, it is usually necessary to use a feeding device to transport the tail slag out for treatment to remove the pollutants in the tail slag. Therefore, the feeding device has become an important component in the tail slag treatment. How to feed the tail slag is crucial for the efficient operation of the overall equipment.

[0003] For example, the Chinese patent with the publication number CN120057507A discloses a raw material adding device and method in the preparation process of polyaluminum chloride. Such a device transports raw materials into the shell through a feeding port, uses a driving device to drive the spiral shaft and spiral blades to rotate, transports the raw materials towards the feeding pipe, and at the same time, realizes the efficient feeding of the raw materials by the opening and closing of the piston, avoiding the situation of raw material jamming and retention.

[0004] However, most of the existing feeding devices adopt the method of stacking and feeding to realize their feeding function. Due to the stacking feeding of materials, the materials often show phenomena such as extrusion adhesion and agglomeration, resulting in relatively limited subsequent reactions of the materials, and often only surface reaction treatment work can be carried out. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a tail slag pickling absorption feeding device and its working method, which solve the problems raised in the background art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: a tail slag pickling absorption feeding device and its working method.

[0007] On the one hand, the present invention provides a tail slag pickling absorption feeding device, including: a feeding tank; a rotating shaft, which is arranged in the middle of the feeding tank; a conveying cylinder, at least one group of conveying cylinders is arranged circumferentially along the rotating shaft, and a conveying screw is arranged inside the conveying cylinder. The conveying cylinder rotates circumferentially along the rotating shaft to rotate and feed the tail slag, and drives the conveying screw to rotate self - to discharge the tail slag along its conveying track; a crushing cylinder, which is set to two groups and is arranged at the bottom discharge port of the conveying cylinder to revolve with the conveying cylinder. Two crushing rollers are arranged inside the crushing cylinder, and the crushing rollers rotate self - with the conveying screw to crush the tail slag and scatter it circumferentially; a screening mesh hopper, which is arranged at the bottom discharge port of the crushing cylinder, and the screening mesh hopper vibrates up and down with the rotation of the crushing cylinder to vibrate and screen the circumferentially scattered tail slag.

[0008] Furthermore, it also includes a grinding cylinder arranged in the middle of the bottom of the screening net bucket cone, and a first grinding roller and a second grinding roller are arranged in sequence from top to bottom inside the grinding cylinder. The first grinding roller and the second grinding roller rotate relatively with the rotation of the two groups of crushing rollers, and the tailings that fail the screening are ground and crushed in forward and reverse directions.

[0009] Furthermore, it also includes a discharge hopper arranged below the screening net bucket away from the grinding cylinder. The discharge hopper is provided with at least one group of percussion hammers along its circumference. The percussion hammers are lifted and reset as the screening net bucket vibrates up and down, applying percussion vibration to the discharge hopper to gather the center of the tailings falling on the discharge hopper.

[0010] Furthermore, it also includes: a hopper, which is arranged at the inner top of the feed tank; a distribution plate, which is arranged at the conical bottom of the hopper along the axial direction of the rotating shaft, and the distribution plate is provided with a feeding port opposite to the inlet of the conveying cylinder. The distribution plate drives the feeding port to rotate, so that the tailings in the hopper fall in a wave-like manner.

[0011] Furthermore, it also includes: a support ring frame, which is arranged on the feed tank away from the screening net bucket, and the support ring frame is provided with multiple groups of spring seats along its circumference, the top end of the spring seat supports the screening net bucket, and the bottom end of the spring seat is provided with a pressure guide rod for applying pressure to the percussion hammer; a side support seat, which is staggered with the pressure guide rod and arranged on the feed tank, and a swing arm is provided at the rotating shaft end of the side support seat, one end of the swing arm supports the percussion hammer, and the other end of the swing arm is pressed down by the pressure guide rod to drive the percussion hammer to rise and freely fall to hammer the unloading hopper.

[0012] Furthermore, it also includes: a second grinding shaft, which is arranged in the middle of the second grinding roller and is fixedly connected to the second grinding roller; a limiting bearing, which is arranged in the first grinding roller along the axial direction of the second grinding shaft, and the second grinding shaft is rotatably connected and limited to the first grinding roller through the limiting bearing; a first grinding shaft, which is fixedly connected to the first grinding roller along the axial direction of the second grinding shaft, and the first grinding shaft and the second grinding shaft are driven by two groups of crushing rollers to rotate forward and reversely, driving the first grinding roller and the second grinding roller to rotate relative to each other, and re-grinding and crushing the tailings that have failed the screening on the screening net bucket.

[0013] Furthermore, a driving component is provided in the feed tank, wherein the driving component is used to drive the conveying screw and the crushing roller to rotate synchronously, wherein the driving component includes: a bevel gear plate, which is staggered with the conveying screw and arranged on the feed tank; an active bevel gear, which is arranged at one end of the conveying screw, the active bevel gear is meshed with the bevel gear plate and rotates circumferentially along the bevel gear plate, and is used to drive the conveying screw to rotate; a second transmission gear, which is provided in two groups and is respectively provided at one end of the crushing roller, one side of the second transmission gear is meshed with a first transmission gear, one side of one group of the first transmission gears is meshed with a driven gear, and the driven gear is meshed with the active gear provided on the conveying screw, and is used to drive the crushing roller to rotate with the conveying screw.

[0014] Furthermore, the driving component is also used to drive the screening net bucket to vibrate up and down, wherein the driving component also includes: a boss seat, which is arranged on the edge of the screening net bucket away from the crushing barrel; a pressure wheel, which is arranged on one side of the crushing barrel, and the pressure wheel rotates with the crushing barrel and is interlaced and pressed with the boss seat to drive the screening net bucket to vibrate up and down.

[0015] Furthermore, the driving assembly is also used to drive the first grinding roller and the second grinding roller to rotate relative to each other, wherein the driving assembly also includes: a third transmission gear, which is provided in two groups and is respectively arranged at the other end of the two groups of crushing rollers; a transmission shaft, which is provided in two groups and is respectively arranged at the center axis of the spacing between the two groups of crushing rollers, a fifth transmission gear is provided at one end of the transmission shaft, a fourth transmission gear is meshed between the fifth transmission gear and the third transmission gear, and a driven bevel gear is provided at the other end of the transmission shaft; a second driven bevel gear disk, which is provided at the top end of the second grinding shaft, and is meshed with one group of driven bevel gears to drive the second grinding roller to rotate; a first driven bevel gear disk, which is provided at the top end of the first grinding shaft, and is meshed with another group of driven bevel gears to drive the first grinding roller to rotate in the opposite direction relative to the second grinding roller.

[0016] On the other hand, the present invention also provides a working method of a tailings pickling absorption feeding device, which is applicable to the above-mentioned tailings pickling absorption feeding device, and comprises the following steps: Step 1: The bucket elevator conveys the tailings into the feed tank. The tailings are quantitatively fed and crushed through the revolution and rotation of the conveying screw and the crushing roller in the feed tank, and are circumferentially spread on the screening net bucket for vibration screening. The unqualified tailings are ground and crushed by the first grinding roller and the second grinding roller, and then fall into the discharge hopper together. After being vibrated and hammered by the hammer, the tailings gather to the center of the discharge hopper. Step 2: The crushed tailings are quantitatively dropped into the discharge cylinder along the center of the discharge hopper. At this time, the combustion nozzle sprays out flames to catalytically combust the hydrogen fluoride gas in the tailings in a combustion catalytic manner, and at the same time, the tailings are secondarily combusted and heated. During the continuous falling of the tailings along the discharge cylinder, the air-blowing nozzle sprays out lime powder in a pneumatic conveying manner, mixes with the concentrated sulfuric acid in the tailings, and forms an air curtain at the bottom of the discharge cylinder to reduce the overflow of waste gas. Step 3: The waste gas after combustion catalysis is discharged along the exhaust port under the wind pumping of the exhaust fan, filtered by an external dust collector, discharged to the sewage treatment station for treatment, and then emptied. Step 4: The tailings mixed with lime powder fall into the pickling tank for stirring. By utilizing the slag temperature of the tailings and the secondary combustion heating of the combustion nozzle, the neutralization reaction rate between the lime powder and the concentrated sulfuric acid in the tailings is increased. Then, the tailings are cooled by the tailings cooling cylinder and transported out.

[0017] The present invention has the following beneficial effects: (1) For this tailings pickling absorption feeding device, through the spiral quantitative feeding and circumferential spreading of the tailings after crushing, the tailings are fed in a dispersed state. Then, through the vibration screening of the crushed tailings and the re-grinding and crushing of the unqualified tailings, the tailings are transported and fed in a quantitative and evenly crushed state, and the tailings are transported into the pickling absorption equipment for continuous, stable, and comprehensive pickling absorption treatment.

[0018] (2) For this tailings pickling absorption feeding device, through the synchronous circumferential revolution and self-rotation of the conveying screw and the crushing roller, the conveying screw is used to rotate and feed and discharge the tailings, avoiding the accumulation and blockage of the tailings, and at the same time, the tailings are evenly discharged along the conveying direction. The crushing roller is used to crush and circumferentially spread and discharge the tailings, so that the tailings are evenly fed in a crushed and dispersed state, and the tailings are evenly spread onto the screening mesh hopper for vibration screening.

[0019] (3) For this tailings pickling absorption feeding device, through the setting of the screening mesh hopper, it vibrates up and down by itself along with the circumferential revolution of the crushing roller, synchronously vibrates and screens the circumferentially spread tailings, and converges the unqualified crushed tailings into the grinding cylinder. The self-rotation of the crushing roller drives the first grinding roller and the second grinding roller to rotate relatively, and the unqualified crushed tailings are secondarily ground and crushed, so that the tailings are fully crushed and dispersed for pickling absorption reaction.

[0020] (4) For this tailings pickling absorption feeding device, through the combination setting of the discharge hopper and the hammering structure, the synchronous driving of the hammering structure by the up and down vibration of the screening mesh hopper is utilized to drive the hammering structure to cyclically knock and vibrate the discharge hopper, and the tailings falling onto the discharge hopper after screening are vibrated and discharged, so that the tailings converge towards the center, and the vibration discharge is continuous and stable, avoiding the situation of retention and accumulation.

[0021] (5) The working method of the tail slag pickling absorption feeding device is to catalytically react hydrogen fluoride gas in the tail slag by combustion catalysis, and secondarily burn and heat up the continuously discharged tail slag. Then, by means of pneumatic conveying, lime powder is mixed with the continuously discharged tail slag. Utilizing the slag temperature of the tail slag and the secondary combustion heating of the combustion nozzle, the neutralization reaction rate between the lime powder and concentrated sulfuric acid in the tail slag is increased. Moreover, the pneumatic conveying of the lime powder forms an air curtain, enabling the orderly diversion treatment of solid-phase tail slag and gas-phase tail slag, thereby improving the treatment efficiency.

[0022] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a partial cross-sectional view of the present invention; Figure 3 is a partial cross-sectional view of the feed tank in the present invention; Figure 4 is a first layout schematic diagram of the conveying cylinder and the crushing cylinder in the present invention; Figure 5 is a second layout schematic diagram of the conveying cylinder and the crushing cylinder in the present invention; Figure 6 is a force-driven schematic diagram of the conveying screw and the crushing roller in the present invention; Figure 7 is a force-applying driving schematic diagram of the conveying screw and the crushing roller in the present invention; Figure 8 is an assembly schematic diagram of the conveying screw and the crushing roller in the present invention; Figure 9 is a first assembly schematic diagram of the screening mesh bucket and the discharge bucket in the present invention; Figure 10 is a second assembly schematic diagram of the screening mesh bucket and the discharge bucket in the present invention; Figure 11 is a schematic structural diagram of the hammering structure in the present invention; Figure 12 is a transmission schematic diagram of the driven bevel gear, the first driven bevel gear disc, and the second driven bevel gear disc in the present invention; Figure 13 is a connection schematic diagram of the screening mesh bucket and the grinding cylinder in the present invention; Figure 14 is a transmission schematic diagram of the first grinding shaft and the second grinding shaft in the present invention; Figure 15 is an assembly schematic diagram of the first grinding roller and the second grinding roller in the present invention; Figure 16It is an assembly sectional view of the first grinding roller and the second grinding roller in the present invention; Figure 17 It is the first partial sectional view of the pickling tank in the present invention; Figure 18 It is the second partial sectional view of the pickling tank in the present invention.

[0024] In the figure, 1, feed tank; 2, pickling tank; 3, first motor; 4, second motor; 5, feed inlet; 6, exhaust port; 7, discharge port; 8, hopper; 9, baffle; 10, rotating shaft; 11, distributing plate; 12, feeding port; 13, conveying cylinder; 14, crushing cylinder; 15, driving bevel gear; 16, bevel gear plate; 17, pressing wheel; 18, boss seat; 19, screening net hopper; 20, hammering structure; 201, side support seat; 202, rotating shaft; 203, swing arm; 204, knocking hammer; 21, discharge hopper; 22, discharge cylinder; 23, stirring shaft; 24, stirring paddle; 25, center seat; 26, conveying screw; 27, crushing roller; 28, feeding hose; 29, grinding cylinder; 30, first grinding roller; 31, second grinding roller; 32, support frame; 33, driving gear; 34, driven gear; 35, first transmission gear; 36, second transmission gear; 37, third transmission gear; 38, fourth transmission gear; 39, fifth transmission gear; 40, transmission shaft; 41, driven bevel gear; 42, side support frame; 43, distributing port; 44, spreading port; 45, support ring frame; 46, pressure guide rod; 47, pressure wheel; 48, spring seat; 49, bearing frame; 50, second grinding shaft; 51, first grinding shaft; 52, second driven bevel gear disc; 53, first driven bevel gear disc; 54, limit bearing; 55, air extraction fan; 56, combustion pipeline; 57, combustion ring pipeline; 58, air blowing pipeline; 59, air blowing ring pipeline; 60, air blowing nozzle; 61, combustion nozzle; 62, slow material screw; 63, cross frame. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments 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 of 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.

[0026] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0027] The following will describe Figures 1 - 18 a tailing slag pickling absorption feeding device and its working method provided by an embodiment of the present invention.

[0028] On the one hand, the present invention provides a tailing slag pickling absorption feeding device.

[0029] Please refer to Figures 1 - 3 , a tailing slag pickling absorption feeding device, including a feeding tank 1. A rotating shaft 10 is provided in the middle of the feeding tank 1. One end of the rotating shaft 10 is provided with a first motor 3 for driving its rotation. The other end of the rotating shaft 10 fixes a conveying cylinder 13 and a crushing cylinder 14 through the combination of a central seat 25 and a side support frame 42. By controlling the operation of the first motor 3, the rotating shaft 10 is driven to rotate, and then the combination of the conveying cylinder 13 and the crushing cylinder 14 is driven to revolve circumferentially along the rotating shaft 10. By using the rotation of the internal conveying screw 26 and the crushing roller 27, quantitative feeding, crushing and circumferential spreading of the tailing slag are carried out.

[0030] In addition, a screening mesh hopper 19 is provided at the bottom discharge port of the crushing cylinder 14. The screening mesh hopper 19 vibrates up and down with the rotation of the crushing cylinder 14 to vibrate and screen the circumferentially spread tailing slag.

[0031] Further, a grinding cylinder 29 is provided in the middle of the conical bottom of the screening mesh hopper 19. Inside the grinding cylinder 29, a first grinding roller 30 and a second grinding roller 31 are arranged in sequence from top to bottom. The first grinding roller 30 and the second grinding roller 31 rotate relatively with the rotation of the two groups of crushing rollers 27 to grind and crush the tailing slag that fails to pass the screening in the forward and reverse directions.

[0032] Furthermore, a discharge hopper 21 is provided below the screening mesh hopper 19. Along the circumference of the discharge hopper 21, there is at least one group of knocking hammers 204. The knocking hammers 204 are lifted and reset with the up and down vibration of the screening mesh hopper 19 to apply knocking vibration to the discharge hopper 21, so as to converge the center of the tailing slag falling on the discharge hopper 21 after crushing.

[0033] It should be noted that a driving assembly is provided in the feeding tank 1. Among them, under the drive of the first motor 3 driving the rotating shaft 10, in a passive force-driven manner, on the one hand, the conveying screw 26 and the crushing roller 27 are driven to rotate synchronously to quantitatively feed, crush and evenly spread the tailing slag, on the other hand, the screening mesh hopper 19 is driven to vibrate up and down to vibrate and screen the tailing slag scattered on its mesh surface, and the first grinding roller 30 and the second grinding roller 31 are driven to rotate in the opposite direction to grind and crush the tailing slag that fails to pass the screening again. Finally, the discharge hopper 21 is knocked and vibrated to vibrate and knock and discharge the tailing slag falling on the discharge hopper 21 after crushing.

[0034] Please refer to Figures 3 - 8In order to realize quantitative feeding, crushing and circumferential spreading of tailings, a conveying screw 26 is provided inside the conveying cylinder 13, and a material distribution port 43 with the same length as the conveying screw 26 is provided at the bottom of the conveying cylinder 13. Two groups of crushing rollers 27 are provided in the two groups of crushing cylinders 14, and a material distribution port 44 with the same length as the crushing roller 27 is provided at the bottom of the crushing cylinder 14. When the conveying cylinder 13 and the crushing cylinder 14 revolve along the rotating shaft 10, the conveying screw 26 and the crushing roller 27 inside are driven to rotate by the passive drive of the driving component, and the tailings are quantitatively distributed along the material distribution port 43 to between the two groups of crushing rollers 27 for crushing, and after crushing, they are spread circumferentially on the screening net bucket 19 along the material distribution port 44. Specifically: The driving assembly includes a bevel gear 16 arranged on the feed tank 1 with a staggered conveying screw 26, a driving bevel gear 15 arranged at one end of the conveying screw 26, the driving bevel gear 15 is meshed with the bevel gear 16, and a second transmission gear 36 is respectively arranged at one end of the crushing roller 27, and a first transmission gear 35 is meshed on one side of the second transmission gear 36, and a driven gear 34 is meshed on one side of a group of first transmission gears 35, and the driven gear 34 is meshed with the driving gear 33 arranged on the conveying screw 26, and the driven gear 34 and the first transmission gear 35 are arranged on a support frame 32, and the support frame 32 is used as its supporting platform. When the conveying cylinder 13 and the crushing cylinder 14 revolve along the rotating shaft 10, the driving bevel gear 15 is driven to rotate circumferentially along the bevel gear 16. Due to the active The bevel gear 15 is meshed with the bevel gear disc 16 for transmission. At this time, the active bevel gear 15 meshes and rotates along the gear track of the bevel gear disc 16, pushing the conveying screw 26 to revolve along the rotating shaft 10 while maintaining self-rotation, so that the tailings are quantitatively discharged along the spiral conveying track of the conveying screw 26, and while the conveying screw 26 rotates, the active gear 33 is driven to rotate, and the meshing of the active gear 33 and the driven gear 34, the meshing of the driven gear 34 and the first transmission gear 35, and the meshing of the first transmission gear 35 and the second transmission gear 36 are utilized to push the two sets of crushing rollers 27 to rotate in opposite directions, so as to crush the discharged tailings, and the crushing rollers 27 in the crushing barrel 14 synchronously revolve along the rotating shaft 10, so that the crushed tailings are evenly discharged in a circumferentially spread manner.

[0035] It should be noted that a hopper 8 is provided at the inner top of the feed tank 1. A material distribution plate 11 fixed to the rotating shaft 10 is provided at the conical bottom of the hopper 8, and a baffle plate 9 that fits the material distribution plate 11 is provided at the conical bottom of the hopper 8. A feeding port 12 opposite to the feeding port of the conveying cylinder 13 is opened on the material distribution plate 11. By providing a feeding port 5 above the feed tank 1 and making the feeding port 5 on both sides of the baffle plate 9, when the tailings fall into the hopper 8 through the feeding port 5, they slide evenly along the baffle plate 9 and are dispersed onto the material distribution plate 11. Then, while the first motor 3 drives the rotating shaft 10 to rotate, the material distribution plate 11 is driven to rotate synchronously, so that the feeding port 12 on the material distribution plate 11 is in dynamic contact with the tailings, maintaining dynamic feeding and avoiding accumulation and blockage. At the same time, when the material distribution plate 11 rotates, the tailings on the material distribution plate 11 are passively scraped into the feeding port 12 under the fixed baffle of the baffle plate 9, further improving the dynamic feeding characteristics of the tailings and avoiding accumulation and blockage, so that the tailings are cyclically and fully fed into the conveying cylinder 13.

[0036] Please refer to Figures 9 - 10 , to achieve the screening of the tailings after crushing, a support ring frame 45 is provided on the feed tank 1. A plurality of spring seats 48 are provided along the circumference of the support ring frame 45. The top of the spring seat 48 supports the screening mesh hopper 19. When the crushed tailings are scattered circumferentially on the screening mesh hopper 19, under the passive drive of the drive assembly, the rotation of the crushing cylinder 14 applies an intermittent downward pressure to the screening mesh hopper 19. After pressing down on the screening mesh hopper 19, the elastic force of the spring seat 48 is used to support it, so that the screening mesh hopper 19 quickly resets. Then, by using the up and down vibration of the screening mesh hopper 19, the unqualified crushed tailings are vibrated and pushed towards the central part and fall into the grinding cylinder 29 for re-grinding and crushing. Specifically: The drive assembly includes a boss seat 18 provided at the edge of the screening mesh hopper 19 and a pressure wheel 17 provided on one side of the crushing cylinder 14. When the pressure wheel 17 revolves with the crushing cylinder 14, it is intermittently and alternately pressed against the boss seat 18, applying an intermittent downward pressure to the boss seat 18. Then, after the screening mesh hopper 19 is pressed down, it is reset under the elastic support of the spring seat 48, so that the screening mesh hopper 19 vibrates up and down in a cyclic up and down movement manner to complete the vibration screening of the crushed tailings.

[0037] Please refer to Figures 12 - 16, to achieve the re - grinding of unqualified tailings, the grinding cylinder 29 is fixed to the feeding tank 1 through a cross - frame 63 provided at its bottom and serves as a support frame for the second grinding shaft 50. The second grinding shaft 50 is provided in the middle of the second grinding roller 31. The second grinding shaft 50 is fixedly connected to the second grinding roller 31. A limiting bearing 54 is provided along the axial direction of the second grinding shaft 50. The second grinding shaft 50 is rotationally connected and limited to the first grinding roller 30 through the limiting bearing 54. The first grinding shaft 51 is fixedly connected to the first grinding roller 30 along the axial direction of the second grinding shaft 50. Using the second grinding shaft 50 as the central support shaft, on the one hand, the second grinding roller 31 is limited at the bottom of the grinding cylinder 29, and on the other hand, the first grinding roller 30 is limited at the top of the grinding cylinder 29 and can rotate relative to the second grinding roller 31. Then, under the passive drive of the drive assembly, the first grinding shaft 51 and the second grinding shaft 50 are driven to rotate forward and backward by the two groups of crushing rollers 27 (since the two groups of crushing rollers 27 rotate symmetrically and the driving forces of the two groups of crushing rollers 27 act on the first grinding shaft 51 and the second grinding shaft 50 respectively, so positive and reverse driving forces for driving the first grinding shaft 51 and the second grinding shaft 50 are formed), driving the first grinding roller 30 and the second grinding roller 31 to rotate relative to each other, and re - grinding and crushing the tailings that are unqualified in screening and fall into the grinding cylinder 29 on the screening net bucket 19. Specifically: The driving assembly includes two sets of third transmission gears 37 respectively arranged at the other ends of the two sets of crushing rollers 27, and two transmission shafts 40 respectively arranged on the central axis of the spacing between the two sets of crushing rollers 27 (since the two transmission shafts 40 are located at the position of the central axis of the spacing between the two sets of crushing rollers 27, the two transmission shafts 40 are directly opposite to the axial center of the rotating shaft 10 and maintain circumferential rotation with the rotating shaft 10 as the axis, and then the driven bevel gears 41 at one axial end thereof rotate circumferentially along the first driven bevel gear disc 53 and the second driven bevel gear disc 52 and are meshed and driven), one end of the transmission shaft 40 is provided with a fifth transmission gear 39, a fourth transmission gear 38 is meshed between the fifth transmission gear 39 and the third transmission gear 37, the other end of the transmission shaft 40 is provided with a driven bevel gear 41, and in addition, a second driven bevel gear disc 52 is arranged at the top end of the second grinding shaft 50, the second driven bevel gear disc 52 is meshed with one of the driven bevel gears 41, a first driven bevel gear disc 53 is arranged at the top end of the first grinding shaft 51, the first driven bevel gear disc 53 is meshed with the other driven bevel gear 41. While the two sets of crushing rollers 27 rotate towards each other, they drive the third transmission gears 37 at their corresponding ends to rotate towards each other, and then, by means of the meshing drive between the third transmission gear 37, the fourth transmission gear 38, and the fifth transmission gear 39, drive the two transmission shafts 40 to rotate symmetrically, and then drive the driven bevel gears 41 on the two transmission shafts 40 to rotate symmetrically. Since the two driven bevel gears 41 are respectively meshed and connected with the first driven bevel gear disc 53 and the second driven bevel gear disc 52, when the two driven bevel gears 41 rotate circumferentially and rotate on their own axes along with the two sets of crushing rollers 27, they sequentially apply meshing driving forces to the first driven bevel gear disc 53 and the second driven bevel gear disc 52, pushing the first grinding shaft 51 to rotate towards the second grinding shaft 50, and then pushing the first grinding roller 30 and the second grinding roller 31 to rotate relatively, so as to perform forward and reverse grinding and crushing work on the tail slag, improve the sufficiency of grinding and crushing, and lay a foundation for the subsequent sufficient pickling and absorption of the tail slag.

[0038] It should be noted that a telescopic and deformable feed hose 28 is arranged between the grinding cylinder 29 and the screening net bucket 19 to provide a deformation space for the up-and-down vibration of the screening net bucket 19, so that the screening net bucket 19 discharges the tail slag that fails to pass the screening into the grinding cylinder 29.

[0039] Please refer to Figures 9 - 11 , to achieve stable discharging of the tail slag after crushing, a driving assembly is arranged between the screening net bucket 19 and the discharging hopper 21. Under the passive driving of the driving assembly, the tail slag on the discharging hopper 21 is vibrated and converged towards the center for discharging, so that the tail slag is continuously and stably discharged. Specifically: The driving assembly includes a pressure guide rod 46 provided at the bottom end of the spring seat 48. The spring seat 48 can be in a split form through the pressure-bearing frame 49 to apply the downward pressure of the spring seat 48 to the pressure guide rod 46 respectively. A pressure wheel 47 is provided at the bottom end of the pressure guide rod 46. The downward pressure of the spring seat 48 is applied to the hammering structure 20 composed of the side support seat 201, the rotating shaft 202, the swing arm 203, and the hammer 204 through the combination of the pressure guide rod 46 and the pressure wheel 47, driving the hammer 204 to lift and freely fall to hammer the discharge hopper 21 (when the pressure guide rod 46 moves downward with the compression of the spring seat 48, it drives the swing arm 203 to swing around the rotating shaft 202 to lift the hammer 204. When the spring seat 48 resets, it drives the pressure guide rod 46 to reset synchronously. The speed of its elastic reset upward is faster than the natural falling speed of the hammer 204, so that the hammer 204 reciprocally lifts and naturally falls under the cyclic downward pressure of the pressure guide rod 46, applying vibration discharge to the discharge hopper 21).

[0040] On the other hand, the present invention also provides a working method for the tail slag pickling absorption feeding device, Please refer to Figures 1 - 2 、 Figures 17 - 18 , a working method for the tail slag pickling absorption feeding device, which includes the following steps: Step 1, the bucket elevator conveys the tail slag into the feeding tank 1. Through the combined revolution and rotation of the conveying screw 26 and the crushing roller 27 in the feeding tank 1, the tail slag is quantitatively fed and crushed, and is circumferentially spread on the screening mesh bucket 19 for vibrating screening. The unqualified tail slag after being ground and crushed by the first grinding roller 30 and the second grinding roller 31 together falls onto the discharge hopper 21, and through the vibration hammering of the hammer 204, the tail slag converges towards the center of the discharge hopper 21; Step 2, the crushed tail slag quantitatively falls into the discharge cylinder 22 along the center of the discharge hopper 21. At this time, the combustion nozzle 61 sprays out flames to catalytically burn the hydrogen fluoride gas in the tail slag in a combustion catalytic manner, and at the same time raises the temperature of the tail slag by secondary combustion. During the continuous falling process of the tail slag along the discharge cylinder 22, the air-blowing nozzle 60 sprays out lime powder in a pneumatic conveying manner, mixes it with the concentrated sulfuric acid in the tail slag, and forms an air curtain at the bottom of the discharge cylinder 22 to reduce the overflow of the combustion waste gas; Step 3, the waste gas after combustion catalysis is pumped along the exhaust port 6 by the wind of the exhaust fan 55, filtered by an external dust collector, discharged to the sewage treatment station for treatment, and then emptied; Step 4, the tail slag mixed with lime powder falls into the pickling tank 2 for stirring. By using the slag temperature of the tail slag and the secondary combustion heating of the combustion nozzle 61, the neutralization reaction rate of the lime powder and the concentrated sulfuric acid in the tail slag is increased, and then the tail slag is cooled by the tail slag cooling cylinder for external transportation.

[0041] In addition, a combustion manifold 57 and a combustion pipeline 56 are provided on the combustion nozzle 61 as the natural gas supply pipeline of the combustion nozzle 61, which is connected to an external natural gas device. A gas-blowing manifold 59 and a gas-blowing pipeline 58 are provided on the gas-blowing nozzle 60 as the pumping pipeline of the gas-blowing nozzle 60, which is connected to an external lime powder air pump device. By setting the combustion nozzle 61 and the gas-blowing nozzle 60 to be inclined downward, it can prevent the tail slag powder from entering the combustion nozzle 61 or the gas-blowing nozzle 60. Moreover, the combustion nozzle 61 with an inclined downward combustion jet can accelerate the flow rate of hydrogen fluoride gas in the tail slag and improve the combustion catalytic reaction efficiency of hydrogen fluoride gas. The pneumatic conveying of the gas-blowing nozzle 60 with an inclined downward direction can form an air curtain at the bottom discharge port of the discharge cylinder 22, so as to reduce the flow of tail slag waste gas into the pickling tank 2, enabling the tail slag waste gas to be directly discharged through the exhaust port 6 and preventing the waste gas in the tail slag from flowing into the pickling tank 2 and reacting with the water vapor in the pickling tank 2 to generate hydrofluoric acid (the lime powder neutralizes the concentrated sulfuric acid in the tail slag to produce water, which generates steam under the high temperature of the slag temperature).

[0042] It should be noted that a second motor 4 is provided at the bottom of the pickling tank 2. The output end of the second motor 4 is provided with a stirring shaft 23 extending into the discharge cylinder 22. A stirring paddle 24 is provided at the bottom end of the stirring shaft 23, and a slow-feed screw 62 is provided at the top end of the stirring shaft 23 and is built into the middle of the discharge cylinder 22. By controlling the operation of the second motor 4, the stirring shaft 23 is driven to rotate, and then the combination of the stirring paddle 24 and the slow-feed screw 62 is driven to rotate. By using the rotation of the slow-feed screw 62, the tail slag discharged from the discharge cylinder 22 is fed slowly, making the discharge of the tail slag smoother so as to fully combine with the lime powder. By using the rotation of the stirring paddle 24, the lime powder and the tail slag falling into the pickling tank 2 are stirred and mixed again, so that the lime powder and the concentrated sulfuric acid in the tail slag are fully mixed to improve the neutralization reaction rate. After the reaction ends, continuous stirring is carried out to push the slag material out through the discharge port 7 at the bottom of the pickling tank 2 by stirring.

[0043] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A tailings acid washing absorption feeding device, characterized in that: include: Feed tank (1); A rotating shaft (10), the rotating shaft (10) being arranged in the middle of the feed tank (1); A conveying cylinder (13), wherein the conveying cylinder (13) is provided with at least one group of conveying screws (26) along the circumferential direction of the rotating shaft (10), and a conveying screw (26) is provided inside the conveying cylinder (13). The conveying cylinder (13) rotates along the circumferential direction of the rotating shaft (10) to rotate the tailings for loading, and drives the conveying screw (26) to rotate to discharge the tailings along its conveying trajectory; A crushing cylinder (14), wherein the crushing cylinder (14) is provided in two groups and is arranged at the discharge port at the bottom of the conveying cylinder (13) and revolves along with the conveying cylinder (13). Two groups of crushing rollers (27) are arranged in the crushing cylinder (14), and the crushing rollers (27) rotate along with the conveying screw (26) to crush the tailings and spread them in a circumferential direction; The screening net bucket (19) is arranged at the discharge port at the bottom of the crushing cylinder (14). The screening net bucket (19) vibrates up and down as the crushing cylinder (14) rotates, thereby vibrating and screening the tailings spread in the circumferential direction.

2. The tailings acid pickling absorption feeding device according to claim 1, characterized in that: It also includes a grinding cylinder (29) disposed at the middle of the cone bottom of the screening net bucket (19), wherein a first grinding roller (30) and a second grinding roller (31) are disposed in sequence from top to bottom inside the grinding cylinder (29), and the first grinding roller (30) and the second grinding roller (31) rotate relative to each other as the two groups of crushing rollers (27) rotate, thereby grinding and crushing unqualified tailings in forward and reverse directions.

3. The acid pickling absorption feeding device for tailings residue according to claim 2, characterized in that: The invention also includes a discharge hopper (21) which is arranged below the screening net hopper (19) away from the grinding cylinder (29). The discharge hopper (21) is provided with at least one set of percussion hammers (204) along its circumference. The percussion hammers (204) are lifted and reset as the screening net hopper (19) vibrates up and down, exerting percussion vibration on the discharge hopper (21) to gather the center of the tailings falling on the discharge hopper (21).

4. The tailing slag pickling absorption feeding device according to claim 2, wherein: Also includes: A hopper (8), wherein the hopper (8) is arranged at the inner top of the feed tank (1); A material distribution plate (11) is arranged at the conical bottom of the hopper (8) along the axial direction of the rotating shaft (10), and a feeding port (12) is provided on the material distribution plate (11) opposite to the feeding port of the conveying cylinder (13). The material distribution plate (11) drives the feeding port (12) to rotate, so that the tailings in the hopper (8) fall in a wave-like manner.

5. The acid-washing absorption feeding device for tailings residue according to claim 2, characterized in that: Also includes: A support ring frame (45), the support ring frame (45) being arranged on the feed tank (1) away from the screening net bucket (19), the support ring frame (45) being provided with a plurality of groups of spring seats (48) along its circumference, the top end of the spring seat (48) supporting the screening net bucket (19), and the bottom end of the spring seat (48) being provided with a pressure guide rod (46) for applying pressure to the striking hammer (204); A side support seat (201) is provided on the feed tank (1) at a position offset from the pressure guide rod (46); a swing arm (203) is provided at a rotating shaft end of the side support seat (201); one end of the swing arm (203) supports a striking hammer (204); the other end of the swing arm (203) is pressed downward by the pressure guide rod (46) to drive the striking hammer (204) to rise and freely fall to strike the discharge hopper (21).

6. The acid pickling absorption feeding device for tailings residue according to claim 2, characterized in that: Also includes: a second grinding shaft (50), the second grinding shaft (50) being arranged at the middle of the second grinding roller (31), the second grinding shaft (50) being fixedly connected to the second grinding roller (31); a limit bearing (54), wherein the limit bearing (54) is arranged in the first grinding roller (30) along the axial direction of the second grinding shaft (50), and the second grinding shaft (50) is rotationally connected to the first grinding roller (30) and limited in position via the limit bearing (54); A first grinding shaft (51) is fixedly connected to the first grinding roller (30) along the axial direction of the second grinding shaft (50). The first grinding shaft (51) and the second grinding shaft (50) are driven by two sets of crushing rollers (27) to rotate in forward and reverse directions, driving the first grinding roller (30) and the second grinding roller (31) to rotate relative to each other, and re-grinding and crushing the unqualified tailings on the screening net bucket (19).

7. The tailing acid-washing absorption feeding device according to claim 6, characterized in that: The feed tank (1) is provided with a driving assembly, wherein the driving assembly is used to drive the conveying screw (26) and the crushing roller (27) to rotate synchronously, wherein the driving assembly comprises: A conical toothed disc (16), wherein the conical toothed disc (16) is arranged on the feed tank (1) so as to be staggered from the conveying screw (26); A driving bevel gear (15), the driving bevel gear (15) being arranged at one end of the conveying screw (26), the driving bevel gear (15) being meshed with the bevel gear disk (16) and rotating along the circumference of the bevel gear disk (16), and being used to drive the conveying screw (26) to rotate; The second transmission gear (36) is provided in two groups and is respectively provided at one end of the crushing roller (27). One side of the second transmission gear (36) is meshed with a first transmission gear (35). One side of one group of the first transmission gears (35) is meshed with a driven gear (34). The driven gear (34) is meshed with a driving gear (33) provided on the conveying screw (26) and is used to drive the crushing roller (27) to rotate together with the conveying screw (26).

8. A tailings acid pickling absorption feeding device according to claim 7, characterized in that: The driving assembly is also used to drive the screening net bucket (19) to vibrate up and down, wherein the driving assembly further comprises: A boss seat (18), wherein the boss seat (18) is arranged at an edge of a screening net bucket (19) away from the crushing cylinder (14); A pressing wheel (17) is arranged on one side of the crushing cylinder (14). The pressing wheel (17) rotates with the crushing cylinder (14) and is interlaced and pressed with the boss seat (18) to drive the screening net bucket (19) to vibrate up and down.

9. The acid pickling absorption feeding device for tailings residue according to claim 7, characterized in that: The driving assembly is also used to drive the first grinding roller (30) and the second grinding roller (31) to rotate relative to each other, wherein the driving assembly further comprises: A third transmission gear (37), wherein the third transmission gear (37) is provided in two groups and is respectively provided at the other end of the two groups of crushing rollers (27); A transmission shaft (40), wherein the transmission shaft (40) is provided in two groups and is respectively provided at the center axis of the spacing between the two groups of crushing rollers (27); a fifth transmission gear (39) is provided at one end of the transmission shaft (40); a fourth transmission gear (38) is meshed between the fifth transmission gear (39) and the third transmission gear (37); and a driven bevel gear (41) is provided at the other end of the transmission shaft (40); The second driven bevel gear disc (52) is provided at the top end of the second grinding shaft (50). The second driven bevel gear disc (52) meshes with one set of driven bevel gears (41) and is used to drive the second grinding roller (31) to rotate. The first driven bevel gear disc (53) is provided at the top end of the first grinding shaft (51). The first driven bevel gear disc (53) meshes with the other set of driven bevel gears (41) and is used to drive the first grinding roller (30) to rotate in the opposite direction relative to the second grinding roller (31).

10. A working method of a tailing acid-washing absorption feeding device, applicable to the tailing acid-washing absorption feeding device according to any one of claims 1-9, characterized in that: It includes the following steps: Step 1: The bucket elevator conveys the tail slag into the feed tank (1). Through the combined revolution and rotation of the conveying screw (26) and the crushing roller (27) in the feed tank (1), the tail slag is quantitatively fed and crushed, and is circumferentially spread on the vibrating screen bucket (19) for vibrating screening. The unqualified tail slag after being ground and crushed by the first grinding roller (30) and the second grinding roller (31) together falls onto the discharge hopper (21), and through the vibrating hammering of the knocking hammer (204), the tail slag converges towards the center of the discharge hopper (21). Step 2: The crushed tail slag quantitatively falls into the discharge cylinder (22) along the center of the discharge hopper (21). At this time, the combustion nozzle (61) sprays flames to catalytically combust the hydrogen fluoride gas in the tail slag in a combustion catalytic manner, and at the same time, the tail slag is secondarily combusted to increase the temperature. During the continuous falling of the tail slag along the discharge cylinder (22), the air-blowing nozzle (60) sprays lime powder in a pneumatic conveying manner, mixes with the concentrated sulfuric acid in the tail slag, and forms an air curtain at the bottom of the discharge cylinder (22) to reduce the overflow of waste gas. Step 3: The waste gas after combustion catalysis is discharged along the exhaust port (6) under the wind pumping of the exhaust fan (55), filtered by an external dust collector, and then discharged to the sewage treatment station for treatment and then emptied. Step 4: The tail slag mixed with lime powder falls into the pickling tank (2) for stirring. By utilizing the slag temperature of the tail slag and the secondary combustion temperature increase of the combustion nozzle (61), the neutralization reaction rate between the lime powder and the concentrated sulfuric acid in the tail slag is increased, and then the tail slag is cooled by the tail slag cooling cylinder and transported out.

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