Rotary kiln with uniform feeding, spodumene transformation roasting system and roasting method

Abstract

The invention relates to a rotary kiln with uniform feeding, a spodumene transformation roasting system and a roasting method, and belongs to the field of spodumene transformation roasting and cooling. A uniform feeding device is arranged between a rotary kiln body and a grate cooler, and roasted materials leaving the rotary kiln body are gathered together by a gathering hopper of the uniform feeding device, and then the lowering hopper is driven by a driving device to reciprocate along the width direction of a grate plate of the grate cooler, so that after the roasted materials fall into the lowering hopper through the gathering hopper, the roasted materials are evenly spread on the grate plate of the grate cooler through the reciprocating motion of the lowering hopper, thereby avoiding the accumulation of coarse-grained materials and fine-grained materials in the roasted materials on the grate plate of the grate cooler, ensuring that the cooling air entering the grate cooler can evenly penetrate the roasted materials, so as to efficiently cool the roasted materials.

Description

Technical Field

[0001] The invention relates to the field of spodumene transition roasting and cooling, and in particular to a rotary kiln with uniform material feeding, a spodumene transition roasting system and a roasting method. Background Art

[0002] In the spodumene lithium extraction process, the spodumene needs to be put into a rotary kiln for high-temperature roasting to transform the naturally existing, chemically inert α-spodumene into β-spodumene that can react with acids and alkalis. Then, the β-spodumene undergoes an acidification reaction with sulfuric acid in the subsequent process to produce soluble lithium sulfate.

[0003] The temperature of the spodumene roasted material after the transformation from the rotary kiln is relatively high, and it needs to be put into the grate cooler for cooling. However, in actual production, it is found that since the rotary kiln is in a rotating state when working, the spodumene roasted material will be affected by centrifugal force, gravity and inertia when leaving the rotary kiln. The roasted material with large particle size will be thrown to a position farther from the bottom of the rotary kiln by a larger force, while the roasted material with small particle size will fall to a position closer to the bottom of the rotary kiln. The gaps between the coarse materials with large particle size are larger, and the cooling air can easily pass through to cool the coarse materials. The gaps between the fine materials with small particle size are small, making it difficult for the cooling air to pass through. As more and more fine materials fall, the air permeability of the grate plate at that place becomes worse and worse. Therefore, the accumulation of fine materials at that place makes the temperature at that place higher and difficult to cool, affecting the overall cooling quality of the roasted material. When the temperature is too high, it may even burn the grate plate at that place.

[0004] In order to solve the problem that the fine material on the grate cooler is accumulated and the cooling air is difficult to pass through, the Chinese utility model patent CN214792578U discloses a zoned air supply fixed bed of the grate cooler, which includes a plurality of parallel and parallel inclined brackets, a fixed grate plate group is provided on the upper side of the inclined bracket, and the two ends of the lower side of the inclined bracket are respectively vertically connected to the supporting crossbeam, and the lower side of the supporting crossbeam is connected to the column; the fixed grate plate group includes a fine material area, a coarse material area, and an intermediate area, and the lower parts of the fine material area, the coarse material area, and the intermediate area are respectively connected to the first air duct, the second air duct, and the intermediate area. air duct, third air duct; the fixed grate plate group includes a plurality of grate plates, and a regulating valve is provided on the lower side of each grate plate in the fine material area and the coarse material area; the invention divides the fixed bed of the grate cooler into three areas, and according to the segregation of the clinker in the fixed bed of the grate cooler, different cooling air volumes are applied according to the coarse and fine materials to improve the overall cooling efficiency of the roasted material, but it does not solve the problem of fine material accumulation, resulting in the problem of fine material accumulation during the roasted material cooling process, making it difficult for the cooling air at the fine material to pass, so the effect of simply increasing the air volume to cool the fine material is still not good.

[0005] In summary, in view of the defects of uneven distribution of coarse and fine materials and easy accumulation of fine materials in the existing spodumene roasting process, which leads to poor cooling and ventilation effects, the present invention discloses a rotary kiln with uniform material discharge, a spodumene transformation roasting system and a roasting method. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a rotary kiln with uniform unloading, and the specific technical scheme is as follows: it includes a rotary kiln body and a uniform unloading device, the uniform unloading device includes a casing, a gathering hopper is arranged on the casing corresponding to the roasted material outlet of the rotary kiln body, a discharge port is arranged at the bottom of the gathering hopper, and the gathering hopper is used to gather the roasted material discharged through the roasted material outlet of the rotary kiln body; a unloading hopper is slidably installed inside the casing, and when the unloading hopper is located at any sliding position, the discharge port is always arranged corresponding to the unloading hopper up and down; a driving device is arranged on one side of the casing at the unloading hopper, and the driving device is used to drive the unloading hopper to reciprocate.

[0007] The uniform feeding device is installed between the roasting material outlet of the kiln head cover of the rotary kiln body and the feeding port of the grate cooler. The roasting material dropped from the rotary kiln body falls into the gathering hopper, that is, the gathering hopper gathers the coarse material and the fine material together, and then the roasting material falls from the discharge port into the lower feeding hopper. The lower feeding hopper reciprocates in the width direction of the fixed grate plate of the grate cooler to evenly sprinkle the roasting material onto the grate plate of the grate cooler, thereby avoiding the accumulation of coarse material and fine material on the grate plate of the grate cooler. The grate cooler also does not need to supply air in different areas, so that the cooling air can evenly cool the roasting material, thereby improving the cooling efficiency of the roasting material.

[0008] Further, the driving device includes a fin wheel, a reversing roller and a connecting rod;

[0009] The fin wheel is rotatably installed between the gathering hopper and the lower hopper, a plurality of fins are arranged in an annular array on the fin wheel, the discharge port is located above the side of the fin wheel, and the discharge path directly below the discharge port coincides with the vertical tangent of the rotation path of the fins on the fin wheel;

[0010] The reversing roller is rotatably mounted on the housing, and a first sinusoidal slide groove arranged circumferentially around the reversing roller is provided on the outer side wall of the reversing roller, and one end of the reversing roller is transmission-connected to the fin wheel;

[0011] The connecting rod is slidably mounted on the casing, one end of the connecting rod is connected to the lower hopper, and the other end of the connecting rod is provided with a first sliding block, which is slidably arranged inside the first sinusoidal chute.

[0012] When the rotary kiln body is discharging materials, the roasted materials continuously fall onto the fins of the fin wheel to rotate the fin wheel, and the rotation of the fin wheel drives the reversing roller to rotate. When the reversing roller rotates, the first sinusoidal slide groove and the first slider cooperate to drive the connecting rod to drive the discharge hopper to reciprocate in the width direction of the fixed grate plate of the grate cooler, that is, the rotary kiln body with uniform material discharge does not need a power source when working, and can automatically operate when the roasted materials fall from the rotary kiln body.

[0013] Further, the crest of the first sinusoidal groove is located on the left side of the reversing roller, the trough of the first sinusoidal groove is located on the right side of the reversing roller, and the crest and trough of the first sinusoidal groove are arranged relatively on the reversing roller.

[0014] Furthermore, it also includes a feed channel located between the discharge port and the feed hopper, the top of the feed channel is connected to the discharge port, the bottom of the feed channel is arranged corresponding to the feed hopper, the fins on one side of the fin wheel are located in the feed channel, and space is reserved inside the feed channel for the fin wheel to rotate.

[0015] Furthermore, the fin wheel is connected to a transmission shaft, and a first gear is provided on the transmission shaft; one end of the reversing roller is connected to a second gear, and the first gear is meshed with the second gear. A gear chamber is provided on the casing, and the first gear and the second gear are both rotatably installed inside the gear chamber.

[0016] Furthermore, a second slider is provided at one end of the connecting rod close to the reversing roller, the first slider is fixedly mounted on the second slider, a support platform is provided below the second slider, the support platform is fixedly mounted on the casing, a second slide groove is provided on the support platform, the second slider is slidably connected to the second slide groove, and a reinforcing rib is provided below the support platform.

[0017] Furthermore, a guide rail is provided on the inner wall of the casing, the length direction of the guide rail is parallel to the sliding direction of the lower hopper, and a third slider is provided on the side of the lower hopper, and the guide rail is slidably connected with the third slider; a baffle is fixedly installed on the inner wall of the casing, and the height of the upper surface of the baffle gradually decreases along the direction of the inner wall of the casing pointing to the inside of the casing, and the guide rail and the third slider are located in the space directly below the baffle.

[0018] The present invention also discloses a spodumene transformation roasting system using the above-mentioned rotary kiln with uniform feeding, which comprises a preheater and a grate cooler, wherein the roasting material outlet of the preheater is connected to the roasting material inlet of the rotary kiln body, the roasting material outlet of the rotary kiln body is connected to the roasting material inlet of the uniform feeding device, and the roasting material outlet of the uniform feeding device is connected to the roasting material inlet of the grate cooler;

[0019] The uniform feeding device comprises:

[0020] chassis;

[0021] A gathering hopper is installed on the casing, and a discharge port is provided at the lower part of the gathering hopper. The gathering hopper is used to gather the roasted materials leaving the rotary kiln body together;

[0022] The lower hopper is installed below the aggregate hopper and is slidably installed in the casing. When the lower hopper is located at any sliding position, the discharge port is always arranged in a butt joint with the lower hopper up and down;

[0023] The driving device is installed on the casing and is used to drive the lower hopper to reciprocate.

[0024] The present invention also discloses a spodumene transition roasting method using the spodumene transition roasting system, which comprises the following steps:

[0025] Step S1. preheating the spodumene material by a preheater, putting the spodumene material into a rotary kiln body after preheating, and performing transformation roasting on the spodumene material by the rotary kiln body;

[0026] Step S2. The spodumene material is roasted in a rotary kiln body to form a roasted material, and the roasted material is put into a uniform feeding device, and the coarse and fine materials in the roasted material are gathered together through a gathering hopper and then concentrated into a feeding hopper;

[0027] Step S3. The roasted material enters the lower hopper, and the driving device drives the lower hopper to reciprocate in the horizontal direction to evenly sprinkle the roasted material onto the fixed grate plate in the grate cooler;

[0028] Step S4: Cooling the roasted material by a grate cooler.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] 1. The present invention discloses a rotary kiln with uniform feeding, a spodumene transformation roasting system and a spodumene transformation roasting method. A uniform feeding device is installed between a feeding port of a kiln head cover of a rotary kiln body and a feeding port of a grate cooler. The uniformly fed feeding device falls from the rotary kiln body into a gathering hopper. The gathering hopper gathers coarse materials and fine materials in the feeding device. Then the feeding device falls from the feeding port into the feeding hopper. The feeding device reciprocates in the width direction of the grate plate of the grate cooler to evenly sprinkle the feeding device onto the grate plate of the grate cooler, thereby avoiding the accumulation of coarse materials and fine materials on the grate plate of the grate cooler. The grate cooler does not need to supply air in different zones, so that the cooling air can evenly cool the feeding device, thereby improving the cooling efficiency of the feeding device.

[0031] 2. When the uniform feeding device disclosed in the present invention is in use, the roasted material continuously falls onto the fins of the fin wheel, thereby causing the fin wheel to rotate continuously. The rotation of the fin wheel drives the reversing roller to rotate. When the reversing roller rotates, the first sinusoidal slide groove and the first slider cooperate to make the connecting rod drive the feeding hopper to reciprocate. That is, the uniform feeding device disclosed in the present invention does not require an additional power source when working. It can automatically operate when the roasted material falls from the rotary kiln body and automatically stop when no roasted material falls. It is simple, controllable, energy-saving and environmentally friendly. Moreover, the rotation of the fins driven by the fin wheel can break up the coarse and fine materials that fall, avoid agglomeration of the coarse and fine materials, and thus ensure that the roasted material can be more evenly spread on the grate plate of the grate cooler through the feeding hopper later. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the uniform feeding device;

[0033] Figure 2 This is the front view of the uniform feeding device;

[0034] Figure 3 It is a cross-sectional schematic diagram of a uniform feeding device;

[0035] Figure 4 for Figure 2 Sectional view along AA direction;

[0036] Figure 5 It is a schematic diagram of the structure of the driving device inside the uniform feeding device;

[0037] Figure 6 This is a schematic diagram of the working principle when the lower hopper slides to the right;

[0038] Figure 7 It is a schematic diagram of the working principle when the lower hopper slides to the middle position;

[0039] Figure 8 This is a schematic diagram of the working principle when the lower hopper slides to the left;

[0040] Fig. 9 Schematic diagram of the spodumene transformation roasting system.

[0041] Among them: 1-reinforced ribs; 2-aggregation hopper; 21-first mounting hole; 22-discharging port; 3-reversing roller; 31-first sinusoidal chute; 4-support platform; 41-second chute; 5-second slider; 6-connecting rod; 7-gear chamber; 8-casing; 81-second mounting hole; 82-guide rail; 83-bar; 9-discharging channel; 10-first slider; 11-discharging hopper; 111-third slider; 112-second discharging port; 12-fin wheel; 121-fin; 13-drive shaft; 14-first gear; 15-second gear; 16-rotary kiln body; 17-grate cooler; 18-fixed grate plate; 19-preheater; 20-uniform discharging device; 23-air supply device. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following is a preferred embodiment of the present invention in multiple possible embodiments to provide a basic understanding of the present invention, but is not intended to confirm the key or decisive elements of the present invention or to limit the scope of protection.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation manner of the present invention is not limited thereto.

[0045] See also Figures 1 to 5 This embodiment discloses a rotary kiln with uniform material feeding, which comprises:

[0046] Rotary kiln body 16, uniform feeding device 20;

[0047] The uniform feeding device 20 comprises:

[0048] The casing 8 is arranged corresponding to the roasting material outlet of the rotary kiln body 16;

[0049] A gathering hopper 2, which is mounted on the casing 8, and has a discharge port 22 at its bottom. The gathering hopper 2 is used to gather the roasted materials leaving the rotary kiln body 16 together, wherein the roasted materials include coarse materials and fine materials;

[0050] The lower hopper 11 is located below the aggregate hopper 2, and the lower hopper 11 is slidably installed in the casing 8. When the lower hopper 11 is located at any sliding position, the discharge port 22 is always arranged to be connected with the lower hopper 11 up and down, that is, no matter where the lower hopper 11 slides to, the top opening of the lower hopper 11 can always fully receive the roasted material falling through the discharge port 22.

[0051] The driving device is mounted on the casing 8 and is used to drive the lower hopper 11 to reciprocate.

[0052] The uniform feeding device 20 is installed between the roasting material outlet of the kiln head cover of the rotary kiln body 16 and the feeding port of the grate cooler 17. The roasting material dropped from the rotary kiln body 16 falls into the gathering hopper 2, that is, the gathering hopper 2 gathers the coarse material and the fine material together, and then the roasting material falls from the discharge port 22 into the lower hopper 11. The lower hopper 11 reciprocates in the width direction of the grate plate of the grate cooler. While mixing the coarse material and the fine material, the roasting material is evenly sprinkled on the grate plate of the grate cooler 17, thereby avoiding the accumulation of coarse material and fine material on the grate plate of the grate cooler 17. Under the premise that the grate cooler does not need to supply air in different areas, it is ensured that the cooling air can evenly cool the roasting material, thereby improving the cooling efficiency of the roasting material.

[0053] More specifically, the driving device in this embodiment includes a fin wheel 12, a reversing roller 3 and a connecting rod 6;

[0054] The fin wheel 12 is rotatably installed between the gathering hopper 2 and the lower hopper 11. A plurality of fins 121 are arranged in a circular array on the fin wheel 12. The discharge port 22 is located above the side of the fin wheel 12. The rotation path of the fins 121 on the fin wheel 12 coincides with the space directly below the discharge port 22, so that when the roasted material falls, it falls onto the fins 121 along the vertical tangent direction of the rotation path of the fins 121, thereby driving the fin wheel 12 to rotate.

[0055] The reversing roller 3 is rotatably mounted on the housing, and a first sinusoidal chute 31 is arranged around the circumference of the reversing roller 3 on the outer wall of the reversing roller 3, and the left side of the first sinusoidal chute 31 is a wave crest, which is located at the left side of the reversing roller 3. The right side of the first sinusoidal chute 31 is a wave trough, which is located at the right side of the reversing roller 3. The wave crest and the wave trough of the first sinusoidal chute 31 are arranged oppositely on the reversing roller 3, and one end of the reversing roller 3 is transmission-connected to one end of the fin wheel 12 via a connecting shaft;

[0056] The connecting rod 6 is slidably installed on the casing 8, one end of the connecting rod 6 is connected to one side of the top of the lower hopper 11, and the other end of the connecting rod 6 is provided with a first slider 10, the first slider 10 is located in the first sinusoidal chute 31, and is slidably connected with the first sinusoidal chute 31.

[0057] When the rotary kiln body 16 is discharging materials, the roasted materials continuously fall onto the fins 121 of the fin wheel 12, causing the fin wheel 12 to rotate. The rotation of the fin wheel 12 drives the reversing roller 3 to rotate. When the reversing roller 3 rotates, the first sine chute 31 and the first slider 10 slide together, so that the first slider 10 drives the connecting rod 6 and the discharge hopper 11 to reciprocate. That is, the uniform discharge device 20 of this embodiment does not need to be additionally configured with a power source when working, and can automatically operate when the roasted materials fall from the rotary kiln body 16.

[0058] More specifically, the uniform feeding device of this embodiment also includes a feeding channel 9, the upper part of which is connected to the discharge port 22, and the lower part of which leads to the lower hopper 11. The fins 121 on one side of the fin wheel 12 are located in the feeding channel 9, and a space for the fin wheel 12 and the fins 121 to rotate is reserved on the side wall of the feeding channel 9 close to the fin wheel 12 to avoid interference. The feeding channel 9 is used to make the roasted materials falling from the discharge port 22 act on the fins 121 as much as possible, so as to drive the fin wheel 12 to rotate and provide stable power. The fin wheel 12 is connected to a transmission shaft 13, and a first gear 14 is provided on the transmission shaft 13; the reversing roller 3 is connected to a second gear 15, and the first gear 14 is meshed with the second gear 15. A gear chamber 7 is provided on the housing 8, and the first gear 14 and the second gear 15 are both rotatably installed in the gear chamber 7. The design of the gear chamber 7 and the housing 8 separates part of the transmission structure from the space where the roasting material is located, thereby preventing the roasting material from polluting the transmission structure and affecting its normal operation.

[0059] More specifically, a second slider 5 is provided at one end of the connecting rod 6, a first slider 10 is fixedly mounted on the second slider 5, a support platform 4 is provided below the second slider 5, the support platform 4 is fixedly mounted on the housing 8, a second slide groove 41 is provided on the support platform 4, the second slider 5 is located in the second slide groove 41, the second slider 5 and the second slide groove 41 are slidably matched, and a reinforcing rib 1 is provided below the support platform 4. A guide rail 82 is provided on the inner wall of the housing 8, the length direction of the guide rail 82 is the same as the sliding direction of the lower hopper 11, a third slider 111 is provided on the side of the lower hopper 11, the guide rail 82 is matched and connected with the third slider 111, a stop bar 83 is fixedly mounted on the inner wall of the housing 8, the height of the upper surface of the stop bar 83 is gradually reduced from the inner wall of the housing to the inner side, the guide rail 82 and the third slider 111 are located in the space directly below the stop bar 83, and the stop bar 83 can prevent the roasted material from falling onto the third slider 111 and the guide rail 82, affecting the normal sliding match between the third slider 111 and the guide rail 82.

[0060] Since the temperature of the roasted material just leaving the rotary kiln is relatively high, the components in direct contact with the roasted material, such as the gathering hopper 2, the material discharge channel 9, the fin wheel 12, the fin 121, and the material discharge hopper 11 in this embodiment, can be made of high-temperature resistant alloy or ceramic, such as silicon carbide ceramic material, which can withstand a high temperature of up to 1800°C, and can also be coated with a high-temperature resistant interlayer. The gathering hopper 2 is provided with a first mounting hole 21, and the housing 8 is provided with a second mounting hole 81, so as to facilitate the installation of the uniform material discharge device 20 between the rotary kiln body 16 or the grate cooler 17.

[0061] See also Fig. 9 The embodiment of the present invention further provides a spodumene transformation roasting system using the above-mentioned rotary kiln with uniform feeding, which further includes a preheater 19 and a grate cooler 17, wherein the roasting material outlet of the preheater 19 is connected to the roasting material inlet of the rotary kiln body 16, the roasting material outlet of the rotary kiln body 16 is connected to the roasting material inlet of the uniform feeding device 20, and the roasting material outlet of the uniform feeding device 20 is connected to the roasting material inlet of the grate cooler 17; cooling air is provided to the grate cooler 17 through the air supply device 23;

[0062] The uniform feeding device 20 comprises:

[0063] Housing 8;

[0064] A gathering hopper 2, which is mounted on the casing 8, and has a discharge port 22 at its lower portion, and is used to gather the roasted materials leaving the rotary kiln body 16 together;

[0065] The lower hopper 11 is installed below the aggregate hopper 2. The lower hopper 11 is slidably installed in the casing 8. When the lower hopper 11 is located at any sliding position, the discharge port 22 is always arranged to be connected with the lower hopper 11 up and down;

[0066] The driving device is mounted on the casing 8 and is used to drive the lower hopper 11 to reciprocate.

[0067] An embodiment of the present invention further provides a spodumene transition roasting method using the above-mentioned spodumene transition roasting system, which comprises the following steps:

[0068] Step S1. Preheating the spodumene material by the preheater 19, and after preheating, putting the spodumene material into the rotary kiln body 16, and performing transformation roasting on the spodumene material by the rotary kiln body 16;

[0069] Step S2. The spodumene material is roasted in the rotary kiln body 16 to form a roasted material, and the roasted material is put into the uniform feeding device 20, and the coarse and fine materials in the roasted material are gathered together by the gathering hopper 2 and then concentrated into the feeding hopper 11;

[0070] Step S3. The roasted material enters the lower hopper 11, and the lower hopper 11 is driven by the driving device to reciprocate in the horizontal direction to evenly sprinkle the roasted material onto the fixed grate plate 18 in the grate cooler 17;

[0071] Step S4: cooling the roasted material by means of a grate cooler 17.

[0072] In the above steps, the specific operation steps and principles of the uniform feeding device are as follows:

[0073] See also Figures 1 to 8 After calcination, spodumene forms a roasted material in the rotating rotary kiln body 16. When the roasted material leaves the rotary kiln body 16, the roasted material with a larger particle size is subjected to greater centrifugal force, gravity and inertia and is thrown to the bottom of the rotary kiln body 16, while the roasted material with a smaller particle size is subjected to less centrifugal force, gravity and inertia and can directly fall from the rotary kiln body 16. In the embodiment of the present invention, the gathering hopper 2 directly gathers the roasted material with a large particle size and the roasted material with a small particle size together to form a mixed roasted material. The mixed roasted material passes through the discharge port 22 and the feeding channel 9 in sequence. When the mixed roasted material passes through the feeding channel 9, it contacts the fins 121 on the fin wheel 12. The fins 121 are acted upon by the mixed roasted material and drive the fin wheel 12 to start rotating.

[0074] The rotation of the fin wheel 12 drives the transmission shaft 13, the first gear 14, the second gear 15 and the reversing roller 3 to rotate in sequence. When the reversing roller 3 rotates, the first sinusoidal groove 31 on the side wall drives the first slider 10 inside it to reciprocate between the wave crest and the wave trough. The first slider 10 slides along the first sinusoidal groove 31 to realize the reciprocating motion of the first slider 10 in the horizontal direction.

[0075] The first slider 10 drives the second slider 5 and the connecting rod 6, and finally drives the lower hopper 11 to reciprocate in the horizontal direction along the width direction of the fixed grate plate 18 on the grate cooler 17;

[0076] See also Figure 6 , when the lower hopper 11 moves to the right limit position, the lower material channel 9 puts the mixed roasted material into the left side of the lower hopper 11, and the lower hopper 11 sprinkles the mixed roasted material on the right side of the fixed grate plate 18 on the grate cooler 17;

[0077] See also Figure 7 , when the lower hopper 11 moves to the middle of the grate cooler 17, the lower material channel 9 puts the mixed roasted material into the middle of the lower hopper 11, and the lower hopper 11 sprinkles the mixed roasted material on the middle of the fixed grate plate 18 on the grate cooler 17;

[0078] See also Figure 8When the lower hopper 11 moves to the left limit position, the lower material channel 9 puts the mixed roasted material into the right side of the lower hopper 11, and the lower hopper 11 sprinkles the mixed roasted material on the left side of the fixed grate plate 18 on the grate cooler 17.

[0079] The lower hopper 11 evenly spreads the mixed roasted material on the fixed grate plate 18 of the grate cooler 17 in the above-mentioned manner, thereby avoiding the defects of poor ventilation, poor cooling effect, and local excessive temperature causing damage to the fixed grate plate 18 due to the accumulation of fine materials; when the roasted material starts to be transported, the roasted material acts on the fins 121, causing the lower hopper 11 to automatically start reciprocating motion; when the roasted material ends being transported, the lower hopper 11 stops reciprocating motion due to the lack of driving force, so that the uniform unloading device 20 can be automatically started and stopped without an additional power source during operation.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary kiln for uniform material feeding, comprising a rotary kiln body (16), characterized in that: The invention also comprises a uniform material discharge device (20), the uniform material discharge device (20) comprising a casing (8), a collecting hopper (2) being arranged on the casing (8) corresponding to the roasted material outlet of the rotary kiln body (16), a discharge port (22) being arranged at the bottom of the collecting hopper (2), the collecting hopper (2) being used to collect the roasted material discharged through the roasted material outlet of the rotary kiln body (16); a material discharge hopper (11) being slidably mounted inside the casing (8), the discharge port (22) always being arranged corresponding to the lower hopper (11) up and down when the lower hopper (11) is located at any sliding position; a driving device is arranged on one side of the casing (8) at the lower hopper (11), the driving device being used to drive the lower hopper (11) to reciprocate; the driving device comprises a fin wheel (12), a reversing roller (3), and a connecting rod (6); the fin wheel (12) is rotatably mounted Between the collecting hopper (2) and the lower hopper (11), a plurality of fins (121) are arranged in an annular array on the fin wheel (12); the discharge port (22) is located above the side of the fin wheel (12); the discharge path directly below the discharge port (22) coincides with the vertical tangent of the rotation path of the fin (121); the reversing roller (3) is rotatably mounted on the casing (8); a first sinusoidal chute (31) circumferentially arranged around the reversing roller (3) is provided on the outer side wall of the reversing roller (3); one end of the reversing roller (3) is transmission-connected to the fin wheel (12); the connecting rod (6) is slidably mounted on the casing (8); one end of the connecting rod (6) is connected to the lower hopper (11); the other end of the connecting rod (6) is provided with a first slider (10); the first slider (10) is slidably arranged inside the first sinusoidal chute (31).

2. The rotary kiln with uniform feeding according to claim 1, characterized in that: The wave crest of the first sinusoidal groove (31) is located on the left side of the reversing roller (3), the wave trough of the first sinusoidal groove (31) is located on the right side of the reversing roller (3), and the wave crest and wave trough of the first sinusoidal groove (31) are arranged opposite to each other on the reversing roller (3).

3. The rotary kiln with uniform feeding according to claim 2, characterized in that: It also includes a material discharge channel (9) located between the material discharge port (22) and the material discharge hopper (11), the top of the material discharge channel (9) being connected to the material discharge port (22), the bottom of the material discharge channel (9) being arranged corresponding to the material discharge hopper (11), the fins (121) on one side of the fin wheel (12) being located in the material discharge channel (9), and a space for the fin wheel (12) and the fins (121) to rotate is reserved inside the material discharge channel (9).

4. The rotary kiln with uniform feeding according to claim 3, characterized in that: The fin wheel (12) is connected to a transmission shaft (13), and a first gear (14) is provided on the transmission shaft (13); one end of the reversing roller (3) is connected to a second gear (15), and the first gear (14) meshes with the second gear (15); a gear chamber (7) is provided on the housing (8), and the first gear (14) and the second gear (15) are both rotatably mounted inside the gear chamber (7).

5. The rotary kiln with uniform feeding according to claim 3, characterized in that: A second slider (5) is provided at one end of the connecting rod (6) close to the reversing roller (3); the first slider (10) is fixedly mounted on the second slider (5); a support platform (4) is provided below the second slider (5); the support platform (4) is fixedly mounted on the housing (8); a second slide groove (41) is provided on the support platform (4); the second slider (5) is slidably connected to the second slide groove (41); and a reinforcing rib (1) is provided below the support platform (4).

6. The rotary kiln with uniform feeding according to claim 1, characterized in that: A guide rail (82) is provided on the inner wall of the casing (8), the length direction of the guide rail (82) is parallel to the sliding direction of the lower hopper (11), a third sliding block (111) is provided on the side of the lower hopper (11), and the guide rail is connected to the third sliding block (111) in a sliding manner; a baffle (83) is fixedly mounted on the inner wall of the casing (8), the height of the upper surface of the baffle (83) gradually decreases along the inner wall of the casing (8) in a direction pointing to the inside of the casing (8), and the guide rail (82) and the third sliding block (111) are located in the space directly below the baffle (83).

7. A spodumene transformation roasting system, comprising the rotary kiln with uniform feeding according to any one of claims 1 to 6, characterized in that: It also includes a preheater (19) and a grate cooler (17), wherein the roasting material outlet of the preheater (19) is connected to the roasting material inlet of the rotary kiln body (16), the roasting material outlet of the rotary kiln body (16) is connected to the roasting material inlet of a uniform material discharge device (20), and the roasting material outlet of the uniform material discharge device (20) is connected to the roasting material inlet of the grate cooler (17).

8. A spodumene transition roasting method, implemented by the spodumene transition roasting system according to claim 7, characterized in that: The steps include: Step S1. preheating the spodumene material by a preheater (19), and after preheating, putting the spodumene material into a rotary kiln body (16), and performing transformation roasting on the spodumene material by the rotary kiln body (16); Step S2. The spodumene material is roasted in the rotary kiln body (16) to form a roasted material, and the roasted material is fed into the uniform feeding device (20). The coarse and fine materials in the roasted material are gathered together by the gathering hopper (2) and then fed into the feeding hopper (11); Step S3. The roasted material enters the lower hopper (11), and the driving device drives the lower hopper (11) to reciprocate in the horizontal direction, so as to evenly sprinkle the roasted material onto the fixed grate plate (18) in the grate cooler (17); Step S4: Cooling the roasted material by means of a grate cooler (17).

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