Feeding device and roasting system of lithium spodumene rotary kiln

Abstract

The application relates to the technical field of rotary kilns, in particular to a feeding device and a roasting system of a rotary kiln. The feeding device of the rotary kiln is used for feeding the material in a stock bin into the rotary kiln, and comprises a scattering device and a feeding chamber. The scattering device comprises a feeding port, a heat exchange chamber, a material blocking mechanism and a discharging port. The feeding port is arranged at the top of the heat exchange chamber and is connected with the stock bin. The material blocking mechanism is arranged in the heat exchange chamber, and the discharging port is arranged at the bottom of the heat exchange chamber opposite to the top. The discharging port is connected with the feeding chamber, the heat exchange chamber is connected with the rotary kiln through a flue gas duct, and the flue gas duct is connected with the bottom of the heat exchange chamber. The feeding chamber is connected with the rotary kiln. Through the feeding device and the roasting system of the rotary kiln, the material can be scattered by gravity when entering the rotary kiln, and the material can be preheated by contacting with hot flue gas of the rotary kiln, so that the material curtain is uniform, and the scattering effect is good.

Description

Technical Field

[0001] This application relates to the field of rotary kiln technology, and more specifically, to a rotary kiln feeding device and a roasting system. Background Technology

[0002] Rotary kilns are used in the roasting process of materials and have wide applications in cement production, metallurgy, chemical industry, and sludge and waste salt treatment. Taking the roasting process of spodumene as an example, in the pyrometallurgical technology of preparing battery-grade lithium carbonate from spodumene, the material needs to be fed into a rotary kiln for roasting.

[0003] There are generally two processes for feeding materials into a rotary kiln. One is to mechanically break up the material and disperse it into heat exchange pipes for heat exchange before sending it into the rotary kiln for calcination. The other is to directly feed the material into the rotary kiln through a chute for calcination. For the feeding method where the material enters the rotary kiln directly, the material is prone to clogging the feed inlet, resulting in uneven feeding. On the other hand, the feeding method with a mechanical breaking-up process has a complex structure, higher production costs, and the breaking-up device suffers severe wear and tear and has a short lifespan in high-temperature and high-dust environments.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this disclosure is to provide a feeding device and a roasting system for a rotary kiln, which enables the material to be dispersed by its own weight when it enters the rotary kiln and to be preheated by contact with the hot flue gas of the rotary kiln, so that the material curtain is uniform and the dispersion effect is good.

[0006] According to one aspect of this disclosure, a feeding device for a rotary kiln is provided for feeding material from a hopper into the rotary kiln. The feeding device for the rotary kiln includes a dispersing device and a feeding chamber.

[0007] The dispersing device includes a feeding port, a heat exchange chamber, a baffle mechanism, and a discharge port. The feeding port is located at the top of the heat exchange chamber and is connected to the silo. The baffle mechanism is located inside the heat exchange chamber, and the discharge port is located at the bottom of the heat exchange chamber opposite to the top. The discharge port is connected to the feeding chamber. The heat exchange chamber is also connected to the rotary kiln through a flue gas duct, which is connected to the bottom of the heat exchange chamber. The feeding chamber is connected to the rotary kiln.

[0008] In one exemplary embodiment of this disclosure, the material blocking mechanism includes multiple material blocking bars, the extension direction of which is perpendicular to the vertical direction, at least two material blocking bars having different heights in the vertical direction and being staggered from each other in the horizontal direction.

[0009] In an example embodiment of the present disclosure, the material blocking mechanism comprises a first material blocking rod, a second material blocking rod, a third material blocking rod and a fourth material blocking rod, and the cross sections of the first material blocking rod, the second material blocking rod, the third material blocking rod and the fourth material blocking rod are all cross-shaped.

[0010] The second material blocking rod and the third material blocking rod are the same in height in the vertical direction, the first material blocking rod, the second material blocking rod and the fourth material blocking rod are sequentially arranged in the vertical direction, and the second material blocking rod, the fourth material blocking rod, the first material blocking rod and the third material blocking rod are sequentially arranged in the horizontal direction.

[0011] In an example embodiment of the present disclosure, the feeding device of the rotary kiln further comprises a pushing rod and a power device, and the pushing rod is arranged in the feeding chamber in a reciprocating manner and is driven by the power device.

[0012] In an example embodiment of the present disclosure, the feeding device of the rotary kiln further comprises a material valve and a metering air locking device, and the metering air locking device comprises a quantitative feeder and an air locking discharger; the hopper, the material valve, the quantitative feeder, the air locking discharger and the feeding port are sequentially connected.

[0013] The quantitative feeder comprises a conveying belt, the material valve is arranged at the starting point of the conveying belt, and the air locking discharger is arranged at the terminal point of the conveying belt.

[0014] According to another aspect of the present disclosure, a roasting system is provided, comprising:

[0015] a hopper;

[0016] the feeding device of the rotary kiln of any one of the above, which is connected with the hopper;

[0017] a rotary kiln, which is connected with the feeding device of the rotary kiln;

[0018] a returned material collecting device, which is connected with the heat exchange chamber of the feeding device of the rotary kiln and is also connected with the feeding chamber of the feeding device of the rotary kiln.

[0019] In an example embodiment of the present disclosure, the returned material collecting device comprises a first dust collecting device and a second dust collecting device, and the heat exchange chamber, the first dust collecting device and the second dust collecting device are sequentially connected,

[0020] The first dust collecting device is also in communication with the feeding chamber, and the second dust collecting device is also in communication with the feeding chamber.

[0021] In an example embodiment of the present disclosure, the first dust collecting device comprises a dust collecting barrel, a first air inlet pipe, a first air outlet pipe and a first dust discharge pipe, and the first air inlet pipe, the first air outlet pipe and the first dust discharge pipe are all connected to the dust collecting barrel.

[0022] The first air inlet pipe is connected to the heat exchange chamber, and the first air inlet pipe is connected to the top of the heat exchange chamber.

[0023] In an exemplary embodiment of the present disclosure, the second dust collecting device comprises a dust collecting box, filter bags, a second air outlet pipe and a second dust discharge pipe. The dust collecting box is connected to the first air outlet pipe. The filter bags are arranged in the dust collecting box. The second air outlet pipe is connected to the dust collecting box. The second dust discharge pipe is connected to the filter bags. The second dust discharge pipe is connected to the feeding chamber through a second material return valve.

[0024] In an exemplary embodiment of the present disclosure, the second dust collecting device further comprises a chute. The starting point of the chute is connected to the second dust discharge pipe. The ending point of the chute is connected to the second material return valve. The starting point of the chute is further provided with a conveying fan. The ending point of the chute is further provided with an air outlet.

[0025] The feeding device and roasting system of the rotary kiln of the present disclosure, in the process of the lithium aluminosilicate material falling from the feeding port to the lower port under the action of gravity, the high-temperature flue gas enters the heat exchange chamber from the bottom of the heat exchange chamber and rises in the heat exchange chamber, preheats the material by direct contact heat exchange and heat radiation heat exchange, and lifts the material curtain. The particles and powder material dispersed under gravity can form a uniform material curtain under the action of rising flue gas, which is beneficial to improve the dispersion effect of the material and increase the heat exchange efficiency and preheating effect, and at the same time, the flue gas heat can be fully utilized. Moreover, compared with the mechanical dispersion device, the present disclosure does not need a transmission mechanism, has a simple structure, can reduce the failure rate and manufacturing and maintenance costs, is beneficial to maintenance and replacement, and reduces energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate an embodiment consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0027] In order to better understand the present disclosure, reference can be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0028] Figure 1 A schematic diagram of a roasting system according to an exemplary embodiment of the present disclosure is shown;

[0029] Figure 2A schematic view of a material blocking mechanism according to an example embodiment of the present disclosure is shown.

[0030] Reference signs are explained as follows:

[0031] 100, rotary kiln; 11, material bin; 12, material bin anti-blocking device; 13, material valve; 14, dosing machine; 15, air-lock discharger; 16, pneumatic gate valve;

[0032] 21, heat exchange chamber; 22, flue gas duct; 23, feeding valve; 24, material blocking mechanism; 241, first material blocking rod; 242, second material blocking rod; 243, third material blocking rod; 244, fourth material blocking rod;

[0033] 31, feeding chamber; 32, pushing rod; 33, power device;

[0034] 41, first air inlet pipe; 42, dust collecting barrel; 43, first dust discharge pipe; 44, first return valve; 45, first air outlet pipe; 46, dust collecting box; 47, second dust discharge pipe; 48, second return valve; 49, chute; 50, conveying fan. DETAILED DESCRIPTION

[0035] The technical solutions in the example embodiments of the present disclosure will be described clearly and completely below in combination with the drawings in the example embodiments of the present disclosure. The example embodiments described herein are only for illustrative purposes, and are not intended to limit the protection scope of the present disclosure, and therefore it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present disclosure.

[0036] Unless otherwise specified or explained, the terms “connection”, “fixation” and the like should be understood broadly, for example, “connection” can be fixed connection, or detachable connection, or integrally connected, can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0037] Further, the orientation words “inner”, “outer”, “top”, “bottom”, “vertical direction”, “horizontal direction” and the like described in the example embodiments of the present disclosure are only for convenience, and are described according to the angle shown in the drawings based on the orientation of the feeding device and the roasting system of the present disclosure during actual work, and should not be understood as a limitation on the example embodiments of the present disclosure. In addition, the terms “first” and “second” are only used as labels, and are not a limitation on the number of their objects.

[0038] Lithium carbonate, lithium hydroxide, lithium sulfate and lithium chloride and other lithium salt is an important raw material for the preparation of new energy lithium ion battery. At present, when lithium carbonate is produced by using spodumene as raw material, rotary kiln roasting extraction lithium process is usually used. In the prior art, the process of feeding into the rotary kiln usually includes two kinds: feeding process including preheating process and feeding process not including preheating process.

[0039] For the feeding process not including preheating process, the material usually enters the rotary kiln 100 through the inclined chute for transformation roasting, this feeding mode is easy to cause material flushing, uneven material feeding, easy to block the feeding port, and due to the high lithium spodumene roasting temperature, the lithium spodumene crystal transformation roasting quality may be poor without preheating process, which affects the lithium recovery rate. For the feeding process with preheating process, in some feeding equipment, the material falls on the material distribution plate through the air lock feeder, when encountering poor flowability of the material, the material may be accumulated, thereby blocking the feeding port; when encountering good flowability of the material, the material may be easily dispersed, the material curtain is unevenly distributed. In other feeding equipment, the material is changed into fluffy small particle material through a mechanical dispersion device, and is dispersed into a heat exchange pipeline for heat exchange, and then is sent into the rotary kiln 100 through the feeding slope for roasting. However, since the mechanical dispersion device works in the high temperature and high dust flue gas environment, the high-speed rotating mechanical dispersion device contacts with the material, which causes the mechanical dispersion device to be seriously worn, short service life, high failure rate and high cost.

[0040] In view of the above problems, the present disclosure provides a feeding equipment and a roasting system of a rotary kiln, which can make the material enter the rotary kiln 100 by self-weight dispersion, and contact with the hot flue gas of the rotary kiln 100 for preheating, so that the material curtain is uniform and the dispersion effect is good.

[0041] According to a first aspect of the present disclosure, a feeding equipment of a rotary kiln is provided for sending the material in a material bin 11 into a rotary kiln 100 for roasting. As shown in Figure 1 The feeding equipment of the rotary kiln includes a dispersion device and a feeding chamber 31, wherein the dispersion device includes a feeding port, a heat exchange chamber 21, a material blocking mechanism and a discharging port. The feeding port is arranged at the top of the heat exchange chamber 21 and is in communication with the material bin 11, for making the material in the material bin 11 enter the heat exchange chamber 21 from the feeding port, the discharging port is arranged at the bottom of the heat exchange chamber 21 and is in communication with the feeding chamber 31, and the heat exchange chamber 21 is also provided with a material blocking mechanism. The material entering the heat exchange chamber 21 from the feeding port falls on the material blocking mechanism under the action of gravity, is impacted and dispersed into a loose state, and enters the feeding chamber 31 in communication with the rotary kiln 100 from the discharging port. The heat exchange chamber 21 is also in communication with the rotary kiln 100 through a flue gas duct 22 connected to the bottom of the heat exchange chamber 21.

[0042] In the feeding of the feeding device of the rotary kiln of the present disclosure into the rotary kiln 100, taking the internal heating rotary kiln as an example, the flue gas duct 22 can be connected with the rotary kiln burner to guide the flue gas generated by the burner into the heat exchange chamber 21. In the process of the spodumene material falling from the feeding port to the discharge port under the action of gravity, the high-temperature flue gas enters the heat exchange chamber 21 from the bottom of the heat exchange chamber 21 and rises in the heat exchange chamber 21, preheats the material by direct contact heat exchange and heat radiation heat exchange, and lifts the material curtain. The particles and powdery material dispersed by gravity can form a uniform material curtain under the action of the rising flue gas, which is beneficial to improve the dispersion effect of the material and increase the heat exchange efficiency and preheating effect, and at the same time, the flue gas heat can be fully utilized. Moreover, compared with the mechanical dispersion device, the feeding device does not need a transmission mechanism, has a simple structure, can reduce the failure rate and manufacturing and maintenance costs, is beneficial to maintenance and replacement, and reduces energy consumption.

[0043] The same principle can also be applied to other types of rotary kiln 100. For example, in some embodiments, the rotary kiln 100 is an external heating type, and the outer surface of the rotary kiln 100 is provided with a natural gas hot blast stove through a jacket rotating sleeve, and the flue gas duct 22 can be connected with the natural gas hot blast stove sleeved on the outside of the rotary kiln 100 to guide the hot flue gas into the heat exchange chamber 21.

[0044] The feeding device of the rotary kiln of the present disclosure will be described in detail below in combination with the accompanying drawings. Figures 1 to 2 In an exemplary embodiment of the present disclosure, the feeding device of the rotary kiln further comprises a metering air locking device, and the metering air locking device comprises a quantitative feeder 14 and an air locking discharger 15. The outlet of the stock bin 11 can be provided with a stock bin anti-blocking device 12 and a material valve 13 for controlling the discharge amount of the stock bin 11. The stock bin anti-blocking device 12 can be a stirring mechanism or a vibrating mechanism, and the material valve 13 can be a knife gate valve or a rod valve, which is not particularly limited in the present disclosure. In an embodiment, the material valve 13 is a single-layer rod valve or a double-layer rod valve, which can be a manual rod valve, a pneumatic rod valve or an electro-hydraulic rod valve, and can overcome the problem of large opening and closing force caused by large spodumene material particles.

[0045] The silo 11, the material valve 13, the dosing machine 14, the air lock 15 and the feeding port are sequentially connected. The dosing machine 14 is mainly used for automatic continuous weighing and dosing of blocky, granular and powdery materials. The dosing machine 14 includes a conveying belt, and the flow of the conveyed material can be controlled by controlling the speed of the conveying belt. The material valve 13 is arranged at the starting position of the conveying belt, and the air lock 15 is arranged at the terminal position of the conveying belt. The air lock 15 is connected with the feeding port at the top of the heat exchange chamber 21, and is used for vertical feeding into the heat exchange chamber 21. The air lock 15 can improve the sealing performance of vertical feeding, prevent external airflow from entering the equipment and affecting the internal airflow rotation, and further affect the discharging. A pneumatic gate valve 16 can be further arranged between the air lock 15 and the feeding port.

[0046] After the material enters the heat exchange chamber 21 through the feeding port, it is scattered under the action of gravity. In an exemplary embodiment, the material blocking mechanism includes a plurality of material blocking rods, the extension direction of the material blocking rods is perpendicular to the vertical direction, at least two material blocking rods are different in height in the vertical direction, and are staggered in the horizontal direction. Specifically, in the exemplary embodiment of the present disclosure, the vertical direction refers to the direction of gravity, and the vertical direction is also the direction from the top to the bottom of the heat exchange chamber 21. The horizontal direction is parallel to the vertical direction. The structures of the material blocking rods can be completely the same, different from each other, or basically similar. For example, the heat exchange chamber 21 is approximately conical or circular truncated conical from top to bottom, and two material blocking rods with the same cross-sectional shape are arranged in the heat exchange chamber 21. The two material blocking rods extend along the horizontal direction, and the extension axes of the two material blocking rods are parallel. The axes of the two material blocking rods are not in the same horizontal plane, and the axes of the two material blocking rods are not in the same vertical plane.

[0047] After the material enters the heat exchange chamber 21 through the feeding port, it falls on the material blocking rods and is scattered into granular and powdery materials under the impact. Since the two material blocking rods are different in height in the heat exchange chamber 21 and are staggered, it is beneficial to avoid material blocking the material blocking mechanism. In some embodiments, it should be noted that although the cross-sectional shape of the material blocking rod can be the same, the length of the material blocking rod can be different due to the different connection positions of the material blocking rod and the inner wall of the heat exchange chamber 21 according to the different positions of the material blocking rod in the heat exchange chamber 21.

[0048] In an exemplary embodiment, referring to Figure 2As shown, the material blocking mechanism includes a first blocking rod 241, a second blocking rod 242, a third blocking rod 243, and a fourth blocking rod 244. The cross sections of the first blocking rod 241, the second blocking rod 242, the third blocking rod 243, and the fourth blocking rod 244 are the same, and the cross-sectional shape of the first blocking rod 241, the second blocking rod 242, the third blocking rod 243, and the fourth blocking rod 244 does not change along the length extension direction thereof. For example, the cross sections of the first blocking rod 241, the second blocking rod 242, the third blocking rod 243, and the fourth blocking rod 244 are all cross-shaped. The second blocking rod 242 and the third blocking rod 243 are the same in height in the vertical direction, and the first blocking rod, the second blocking rod 242, and the fourth blocking rod 244 are sequentially arranged from top to bottom in the vertical direction; and the second blocking rod 242, the fourth blocking rod 244, the first blocking rod 241, and the third blocking rod are sequentially arranged in the horizontal direction.

[0049] The material blocked by the material blocking mechanism enters the feeding chamber 31 from the discharge port. In an exemplary embodiment of the present disclosure, a feeding valve 23 is arranged between the discharge port and the feeding chamber 31 for air locking and feeding. The feeding device of the rotary kiln further includes a pushing rod 32 and a power device 33. The pushing rod 32 is drivingly connected with the power device 33, and the power device 33 drives the pushing rod 32 to reciprocate in the feeding chamber 31, so that the material accumulated in the feeding chamber 31 can be pushed into the rotary kiln 100. Specifically, the power device 33 can be a hydraulic device, which controls the movement of the pushing rod 32 through hydraulic oil. When the pushing rod 32 advances, the material accumulated in the feeding chamber 31 is pushed into the rotary kiln 100; when the pushing rod 32 retreats, a cavity appears in front of the pushing rod 32, and the material accumulated above the pushing rod 32 fills the cavity. In some exemplary embodiments, the power device 33 can also be a pneumatic device or a linear push rod motor, as long as it can drive the pushing rod 32 to reciprocate in the feeding chamber 31.

[0050] Compared with the conventional method of using the self-weight or height difference of the material to make the material enter the rotary kiln 100, the feeding of the rotary kiln 100 is controlled by the reciprocating movement of the pushing rod 32, which can uniformly feed the material with poor flowability into the rotary kiln 100, avoiding material rushing and the thermal instability of the rotary kiln 100 and the fluctuation of the roasting quality caused by the material rushing. Compared with the screw feeder, the material after being broken up is accumulated in the feeding chamber 31 and is uniformly pushed into the rotary kiln 100 by the pushing rod 32, which can avoid the diffusion of high-temperature particles and dust in the environment, causing equipment damage, and can also reduce the wear of the material on the feeding device, improving the service life of the feeding device.

[0051] According to a second aspect of the present disclosure, a calcination system is provided, which comprises a stock bin 11, a feeding device of a rotary kiln, the rotary kiln 100 and a return material collecting device connected in sequence. The stock bin 11 stores material, and the feeding device of the rotary kiln can be any of the above-mentioned exemplary embodiments or a reasonable combination thereof. The return material collecting device is connected with the heat exchange chamber 21 and also connected with the feeding chamber 31. The calcination system of the exemplary embodiments of the present disclosure has all the beneficial effects of the above-mentioned feeding device of the rotary kiln. Since the high-temperature flue gas rises in the heat exchange chamber 21 from the bottom of the heat exchange chamber 21, the granular material with large gravity can enter the feeding chamber 31 through the discharge port, and the light dust-like material is lifted up. The high-temperature flue gas passes through the return material collecting device, which can collect the material carried in the flue gas and send it into the feeding chamber 31, which is sent into the rotary kiln 100 by the push rod 32, thereby improving the recovery rate of the material and avoiding waste.

[0052] The return material collecting device can include a multi-stage dust collecting device, which can improve the collection effect of the material in the flue gas and avoid waste. The flue gas after passing through the return material collecting device can be discharged after waste gas treatment, so the return material collecting device can also reduce the difficulty of waste gas treatment. In an exemplary embodiment of the present disclosure, the return material collecting device includes a first dust collecting device and a second dust collecting device. The heat exchange chamber 21, the first dust collecting device and the second dust collecting device are connected in sequence, and the first dust collecting device and the second dust collecting device are both in communication with the feeding chamber 31.

[0053] For example, the first dust collecting device includes a dust collecting barrel 42, a first air inlet pipe 41, a first air outlet pipe 45 and a first dust discharge pipe 43. The first air inlet pipe 41, the first air outlet pipe 45 and the first dust discharge pipe 43 are all connected to the dust collecting barrel 42, and the first air inlet pipe 41 is connected to the top of the heat exchange chamber 21. The high-temperature gas carrying dust from the top of the heat exchange chamber 21 enters the dust collecting barrel 42 through the first air inlet pipe 41. Specifically, after the gas enters the dust collecting barrel 42, it is guided by the shape structure in the dust collecting barrel 42 to change from linear motion to circular motion. During the rotation process, due to the centrifugal effect, the material dust particles with relatively large density are separated from the gas and thrown to the inner wall of the dust collecting barrel 42. After the material dust particles contact the inner wall of the dust collecting barrel 42, they fall along the wall and enter the feeding chamber 31 through the first dust discharge pipe 43.

[0054] In an exemplary embodiment, the second dust collecting device comprises a dust collecting box 46, a filter bag, a second air outlet pipe and a second dust discharge pipe 47. The dust collecting box 46 is in communication with the first air outlet pipe 45, and the flue gas after the first stage of material recovery by the first dust collecting device enters the dust collecting box 46. The dust collecting box 46 is provided with a filter bag, which can be needle-punched or a thin film material and is made of a metal cage to prevent being sucked in when filtering the flue gas. The second air outlet pipe is provided with a draft fan, and the flue gas filtered by the filter bag can enter the next stage of dust collecting device or be treated as waste gas through the second air outlet pipe. The second dust discharge pipe 47 is connected to the filter bag to guide the material dust particles filtered by the filter bag into the feeding chamber 31. In other exemplary embodiments, the material return collecting device can also comprise a third dust collecting device or more stages of dust collecting devices to enhance the material recovery effect, and the first dust collecting device and the second dust collecting device can also adopt other dust collecting methods, which will not be described herein.

[0055] In an exemplary embodiment of the present disclosure, a first material return valve 44 is arranged between the first dust discharge pipe 43 and the feeding chamber 31, and a second material return valve 48 is arranged between the second dust discharge pipe 47 and the feeding chamber 31. The first material return valve 44 and the second material return valve 48 can respectively control the first dust collecting device and the second dust collecting device to deliver material to the feeding chamber 31. In an exemplary embodiment, the second dust collecting device further comprises a chute 49, the starting point of the chute 49 is connected to the second dust discharge pipe 47, and the ending point of the chute 49 is connected to the second material return valve 48, that is, the material recovered by the filter bag can be delivered by the chute 49. Specifically, the starting point of the chute 49 is provided with a conveying fan 50 for blowing compressed air into the chute 49 to move the material to the ending point of the chute 49. The ending point of the chute 49 is also provided with an air outlet for discharging air. Since the particle diameter of the material recovered by the second dust collecting device is small, compared with a spiral conveyor, a belt conveyor, a plate feeder and other mechanisms, the present disclosure adopts the chute 49 to deliver the material recovered by the second dust collecting device to the feeding chamber 31, which has good sealing performance and can avoid direct contact between the material and the conveying device, thereby reducing the wear of the device and prolonging the service life. Moreover, the chute 49 can recover the heat of the material in the high-temperature flue gas, thereby reducing the heat loss.

[0056] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the aspects of the present disclosure disclosed herein. It is intended that the present disclosure cover any and all variations of the present disclosure comprising adaptations, modifications, combinations, sub-combinations, and / or alternatives of the principles of the present disclosure disclosed and illustrated herein. It is intended that the present disclosure encompass all such variations as fall within the scope of the appended claims along with the full scope of equivalents to which such claims are entitled. The specification and examples given herein are illustrative only and do not limit the true scope and spirit of the present disclosure.

[0057] It should be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A feeding device for a rotary kiln for spodumene roasting, used to feed material from a silo into the rotary kiln, characterized in that, The feeding equipment of the spodumene roasting rotary kiln includes a dispersing device and a feeding chamber; The dispersing device includes a feeding port, a heat exchange chamber, a baffle mechanism, and a discharge port. The feeding port is located at the top of the heat exchange chamber and is connected to the hopper. The baffle mechanism is located inside the heat exchange chamber and includes a first baffle bar, a second baffle bar, a third baffle bar, and a fourth baffle bar. The extension direction of the baffle bars is perpendicular to the vertical direction, and at least two of the baffle bars have different heights in the vertical direction and are staggered in the horizontal direction. The cross-sections of the first baffle bar, the second baffle bar, the third baffle bar, and the fourth baffle bar are all cross-shaped. The second and third baffle bars are at the same height in the vertical direction. The first, second, and fourth baffle bars are arranged sequentially in the vertical direction, and the second, fourth, first, and third baffle bars are arranged sequentially in the horizontal direction. The discharge port is located at the bottom of the heat exchange chamber opposite to the top. The discharge port is connected to the feeding chamber. The heat exchange chamber is also connected to the rotary kiln via a flue gas duct connected to the bottom of the heat exchange chamber. The flue gas duct is spaced apart from the discharge port. The feeding chamber is connected to the rotary kiln. The feeding equipment of the spodumene roasting rotary kiln also includes a pusher bar and a power device. The pusher bar is reciprocating in the feeding chamber. The pusher bar is driven by the power device, which drives the pusher bar to reciprocate in the feeding chamber, thereby pushing the material accumulated in the feeding chamber into the rotary kiln.

2. The feeding equipment for the spodumene roasting rotary kiln according to claim 1, characterized in that, The feeding equipment of the spodumene roasting rotary kiln also includes a material valve and a metering airlock device, wherein the metering airlock device includes a quantitative feeder and an airlock unloader. The hopper, the material valve, the quantitative feeder, the airlock unloader, and the feeding port are connected in sequence; The quantitative feeder includes a conveyor belt, the material valve is located at the starting point of the conveyor belt, and the airlock unloader is located at the ending point of the conveyor belt.

3. A roasting system, characterized in that, include: silos; The feeding device of the spodumene roasting rotary kiln according to claim 1 or 2 is connected to the silo; A rotary kiln, connected to the feeding equipment of the spodumene roasting rotary kiln; A return material collection device is provided, which is connected to the heat exchange chamber of the feeding equipment of the spodumene roasting rotary kiln and is also connected to the feeding chamber of the feeding equipment of the spodumene roasting rotary kiln.

4. The calcination system according to claim 3, characterized in that, The return material collection device includes a first dust collection device and a second dust collection device, wherein the heat exchange chamber, the first dust collection device, and the second dust collection device are connected in sequence. The first dust collection device is also connected to the feeding chamber, and the second dust collection device is also connected to the feeding chamber.

5. The calcination system according to claim 4, characterized in that, The first dust collection device includes a dust collection bin, a first air inlet pipe, a first air outlet pipe, and a first dust discharge pipe, wherein the first air inlet pipe, the first air outlet pipe, and the first dust discharge pipe are all connected to the dust collection bin; The first air inlet pipe is connected to the heat exchange chamber and is connected to the top of the heat exchange chamber. The first dust discharge pipe is connected to the feeding chamber through the first return valve.

6. The calcination system according to claim 5, characterized in that, The second dust collection device includes a dust collection box, filter bags, a second air outlet pipe, and a second dust discharge pipe. The dust collection box is connected to the first air outlet pipe, the filter bag is placed inside the dust collection box, the second air outlet pipe is connected to the dust collection box, the second dust discharge pipe is connected to the filter bag, and the second dust discharge pipe is connected to the feeding chamber through the second return valve.

7. The calcination system according to claim 6, characterized in that, The second dust collection device also includes an inclined chute, the starting point of which is connected to the second dust discharge pipe, the ending point of which is connected to the second return valve, the starting point of which is also provided with a conveying fan, and the ending point of which is also provided with an air outlet.

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