Rare earth salt calcination device

Abstract

The present invention discloses a rare earth salt calcination device, which comprises a first kiln body, a second kiln body, a combustion device, an air suction device and a material guiding and abrasive device; the first kiln body and the second kiln body are vertically arranged, and their axes are parallel; the top of the first kiln body and the top of the second kiln body are connected by an arc transition part; a feed inlet and a hot air flow inlet are arranged on the side wall of the first kiln body; a retention chamber is arranged on the first kiln body; a discharge outlet is arranged at the lower part of the side wall of the second kiln body; the combustion device is configured to generate hot air flow and is configured to introduce the hot air flow into the first kiln body through the hot air flow inlet; the air suction device is configured to pump air from the second kiln body through the discharge outlet; the material guiding and abrasive device is located below the hot air flow inlet and is configured to grind the falling material particles. The rare earth salt calcination device of the present invention can reduce the phenomenon of clogging the combustion chamber and improve the material recovery rate.

Description

Technical Field

[0001] The present invention relates to a rare earth salt calcination device. Background Art

[0002] In the production process of many chemical reaction materials, dynamic calcination in a high-temperature kiln body is required. The kiln body is connected by two vertical kiln columns. In the system, the material is driven by wind to move in a specific direction. The material enters the calcination kiln at a certain speed. It is necessary to detect, intercept, and recycle large-particle materials. At the connection of the kiln body, due to the imbalance between the wind speed and the gravity of the large-particle materials, the large-particle materials fall from the connection to the bottom of the kiln body with a feed port. When the material accumulates to a certain extent, it will cause the problem of blocking the combustion chamber, and it is easy to cause large fluctuations in the air flow of the kiln body system, resulting in unsmooth production, and at the same time reducing the recovery rate of the material during the calcination process.

[0003] CN2788108Y discloses a regenerative variable-diameter double-chamber calcination vertical kiln, which includes two vertical kiln chambers with feed and discharge ports respectively provided at the upper and lower parts and arranged side by side. The two vertical kiln chambers are connected by a connection channel located in the middle and lower parts of the kiln chamber, and burner sprinklers are evenly arranged in the kiln chamber; a section of the kiln chamber above the connection channel is made into a conical shape. This calcination vertical kiln does not involve the interception of large-particle materials.

[0004] CN101285647A discloses a vertical calcination kiln blanking control device, which includes a kiln body. A funnel-shaped discharge hopper is provided below the cooling area in the kiln body. Above the discharge hopper, there is a material distribution cone with a pointed part upward. A guide cone is fixedly installed at the bottom of the material distribution cone. A cone support frame is provided between the guide cone and the kiln body. The guide cone and the discharge hopper have the same taper, and a continuous discharge device is provided below the discharge port of the discharge hopper. This blanking control device directly controls the discharge of the material from the discharge port.

[0005] CN211717136U discloses a vertical calcination kiln, which includes a calcination kiln body, and also includes: a tubular kiln tool, which is vertically arranged in the calcination kiln body; a cooling pipe, which is arranged in the calcination kiln body and is docked with the bottom end of the tubular kiln tool; a cooling component for cooling the cooling pipe is provided on the cooling pipe. The top of the calcination kiln body is provided with a feed port communicating with the tubular kiln tool, and the cooling pipe passes through the bottom end of the calcination kiln and is docked with a conveying auger. This vertical calcination kiln has only one kiln chamber. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a rare earth salt calcination device, which can reduce the phenomenon of blocking the combustion chamber. Further, it can improve the recovery rate of the material.

[0007] The present invention achieves the above purpose through the following technical solutions.

[0008] The present invention provides a rare earth salt calcination device, which includes a first kiln body, a second kiln body, a combustion device, an air suction device and a material guiding and abrasive device; wherein,

[0009] The first kiln body and the second kiln body are vertically arranged, their axes are parallel, and both are hollow structures; the top of the first kiln body and the top of the second kiln body are connected by an arc transition part;

[0010] A feed inlet and a hot air flow inlet are arranged on the side wall of the first kiln body; the feed inlet is located in the middle of the side wall and is used for adding rare earth salts; the hot air flow inlet is located at the lower part of the side wall;

[0011] A retention chamber is arranged on the first kiln body, which is configured to divide the first kiln body into an upper section and a lower section; the retention chamber is located above the feed inlet and close to the feed inlet; the maximum inner diameter of the retention chamber is larger than the inner diameters of the upper section and the lower section of the first kiln body;

[0012] An outlet is arranged at the lower part of the side wall of the second kiln body for discharging rare earth oxides;

[0013] The combustion device is configured to generate hot air flow and is configured to introduce the hot air flow into the first kiln body through the hot air flow inlet;

[0014] The air suction device is configured to pump air out of the second kiln body through the outlet;

[0015] The material guiding and abrasive device is located below the hot air flow inlet, and most of it is located in the first kiln body. It is configured to grind the falling material particles and is configured to provide an air flow that makes the ground powder move upward.

[0016] According to the rare earth salt calcination device of the present invention, preferably, it further includes a support seat; the first kiln body, the second kiln body, the combustion device, the air suction device and the material guiding and abrasive device are respectively fixed on the support seat.

[0017] According to the rare earth salt calcination device of the present invention, preferably, the material guiding and abrasive device includes a material guiding unit, an abrasive unit, a air supply unit and a motor unit;

[0018] The motor unit is fixed on the support seat and includes a main shaft; the main shaft is configured to be able to rotate;

[0019] The material guiding unit includes a material guiding frame and a connecting rod; the material guiding frame is a hollow structure and is configured to be fixed on the inner side wall of the first kiln body through the connecting rod; the central axis of the material guiding frame coincides with the central axis of the main shaft;

[0020] The abrasive unit includes an abrasive plate and a perforated plate; the abrasive plate is arranged on the main shaft and is set to rotate along with the rotation of the main shaft; the abrasive plate is located above the perforated plate, and there is a set gap between the two. The abrasive plate and the perforated plate are set to grind the falling material particles; multiple holes are arranged on the perforated plate, and the holes are set to allow the ground powder to pass through;

[0021] The air supply unit is arranged below the abrasive unit and is set to generate an upward air flow.

[0022] Preferably, for the rare earth salt calcination device according to the present invention:

[0023] The motor unit further includes a motor; the motor is fixed on the support seat and is set to drive the main shaft to rotate;

[0024] The material guiding unit further includes blades, which are located inside the material guiding frame and above the abrasive unit; the blades are arranged on the main shaft and are set to rotate along with the rotation of the main shaft and are set to generate a downward swirling wind;

[0025] The air supply unit includes a plurality of fan blades, and the fan blades are arranged on the main shaft and are set to rotate along with the rotation of the main shaft.

[0026] Preferably, for the rare earth salt calcination device according to the present invention:

[0027] The material guiding frame is of a cylindrical structure; a bevel is arranged at the top end of the material guiding frame;

[0028] There are multiple abrasive plates, which are symmetrically distributed around the main shaft; the abrasive plate includes a connected upper section and a lower section, the upper section is located inside the material guiding frame, and the lower section is located below the material guiding frame.

[0029] Preferably, for the rare earth salt calcination device according to the present invention, the upper section and the lower section are connected by an arc transition; the angle between the plane where the upper section is located and the central axis of the main shaft is 35° to 65°; the shape of the outer contour of the lower section matches the shape of the inner side wall of the perforated plate.

[0030] Preferably, for the rare earth salt calcination device according to the present invention, the perforated plate is located below the material guiding frame, and the perforated plate is fixedly connected to the material guiding frame; the outer contour of the inner side wall of the perforated plate is in the shape of an arc-shaped funnel.

[0031] Preferably, for the rare earth salt calcination device according to the present invention, the feed inlet and the hot air inlet are on the same side of the side wall of the first kiln body; the discharge outlet is far from the hot air inlet.

[0032] For the rare earth salt calcination device according to the present invention, preferably, the air suction device includes an air suction fan and a connecting pipe, and the connecting pipe is respectively connected to the discharge port and the air suction fan; the air suction fan is arranged to be able to extract air from the second kiln body.

[0033] For the rare earth salt calcination device according to the present invention, preferably, the combustion device includes a combustion chamber and a draft machine; the combustion chamber is arranged to be able to generate hot air flow; the draft machine is arranged to introduce the hot air flow generated by the combustion chamber into the first kiln body through the hot air flow inlet.

[0034] The rare earth salt calcination device of the present invention can basically avoid the phenomenon of clogging the combustion chamber during the long-term calcination process. Further, it can improve the material recovery rate. Brief Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of a rare earth salt calcination device of the present invention.

[0036] Figure 2 is Figure 1 the cross-sectional schematic diagram of.

[0037] Figure 3 It is the cross-sectional schematic diagram of the material guiding and abrasive device of the present invention.

[0038] Figure 4 is Figure 3 the enlarged schematic diagram of the local part A in.

[0039] Figure 5 It is the top view schematic diagram of the material guiding and abrasive device of the present invention.

[0040] The description of the reference numerals is as follows:

[0041] 1 - support base; 21 - first kiln body, 211 - feed inlet, 212 - hot air flow inlet, 213 - interception chamber; 22 - second kiln body, 221 - discharge port; 4 - combustion device; 6 - air suction device, 61 - air suction fan; 8 - material guiding and abrasive device, 81 - material guiding unit, 811 - material guiding frame, 8111 - bevel, 812 - connecting rod, 813 - blade; 82 - abrasive unit, 821 - abrasive plate, 822 - mesh plate; 83 - air supply unit, 831 - fan blade; 84 - motor unit, 841 - main shaft. Detailed Embodiments

[0042] The present invention will be further described below in conjunction with the drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0043] The rare earth salt calcination device of the present invention can be used to solve the problem of blocking the combustion chamber when large particle materials fall and accumulate to a certain extent at the bottom of the first kiln body with a feed inlet, and can improve the material recovery rate. The rare earth salt calcination device of the present invention includes a first kiln body, a second kiln body, a combustion device, a suction device, and a feeding and abrasive device. Optionally, a support base is further included. A detailed description is given below.

[0044] <Support base>

[0045] The support base of the present invention can be arranged on the ground. The first kiln body, the second kiln body, the combustion device, the suction device, and the feeding and abrasive device are respectively fixed on the support base. This facilitates operation.

[0046] In the present invention, the support base can include a support plate and support legs. The support plate is arranged horizontally. The support legs are vertically arranged below the support plate. There are multiple support legs, which are evenly distributed. Specifically, the first kiln body, the second kiln body, the combustion device, the suction device, and the feeding and abrasive device are respectively fixed on the support plate.

[0047] <The first kiln body and the second kiln body>

[0048] In the present invention, the first kiln body and the second kiln body are collectively referred to as the calcination kiln body. The first kiln body and the second kiln body are vertically arranged, their axes are parallel, and both are of a hollow structure. The first kiln body and the second kiln body are arranged at intervals. The tops of the first kiln body and the second kiln body are connected by an arc transition, forming a structure similar to an inverted U shape therebetween. In some specific embodiments, the tops of the first kiln body and the second kiln body are connected by an arc transition part. The first kiln body and the second kiln body can be of a cylindrical structure.

[0049] A feed inlet and a hot gas inlet are arranged on the side wall of the first kiln body of the present invention. The feed inlet is located in the middle of the side wall of the first kiln body and is used for adding rare earth salts. The hot gas inlet is located at the lower part of the side wall of the first kiln body and is used for introducing super-strong hot gas.

[0050] According to an embodiment of the present invention, the feed inlet and the hot gas inlet are located on the same side of the side wall of the first kiln body.

[0051] A retention chamber is also provided on the first kiln body. The retention chamber is configured to divide the first kiln body into an upper section and a lower section. The retention chamber is located above the feed inlet and close to the feed inlet. The maximum inner diameter of the retention chamber is larger than the inner diameters of the upper and lower sections of the first kiln body. The outer contour of the retention chamber is spherical-like. It is found in this application that by providing the retention chamber, the air flow intensity here can be effectively reduced, so that large-particle materials (such as large-particle rare earth salts) can effectively fall from the area of the retention chamber. In this way, large-particle materials that are not fully calcined can be effectively intercepted, so that unqualified large-particle materials can be effectively detected and recycled, increasing the practicality of the overall structure.

[0052] This application believes that this is because the size of the retention chamber is wider than the sizes of the upper and lower sections of the first kiln body of the calcination kiln body. When the diversion wind force drives larger-particle materials to pass through, the diversion wind force intensity will disperse at the retention chamber, so the diversion wind force here will be relatively reduced, causing large-particle materials (such as rare earth salts) to fall downward at the retention chamber, rather than falling downward when turning at the arc above the calcination kiln body (i.e., the connection between the first kiln body and the second kiln body). The structure of this retention chamber can effectively detect and recycle unqualified large-particle materials, while qualified small particles will be carried away by the wind diversion and discharged after calcination is completed.

[0053] An outlet is provided at the lower part of the side wall of the second kiln body of the present invention for discharging rare earth oxides. In the present invention, the outlet is far from the hot air inlet. This is beneficial for operation and convenient for discharging rare earth oxides.

[0054] <Combustion equipment>

[0055] The combustion equipment of the present invention is configured to generate hot air flow and is configured to introduce the hot air flow into the first kiln body through the hot air inlet. This can provide super-strong hot air flow for the kiln body structure to form the temperature required for calcination.

[0056] According to an embodiment of the present invention, the combustion equipment includes a combustion chamber and a diversion machine. The combustion chamber is configured to generate hot air flow. The diversion machine is configured to introduce the hot air flow generated by the combustion chamber into the first kiln body through the hot air inlet.

[0057] <Air suction equipment>

[0058] The air suction equipment of the present invention is configured to evacuate the second kiln body through the outlet. This can facilitate the discharge of qualified rare earth oxides and improve production efficiency.

[0059] In some embodiments, the air suction equipment includes an air suction machine and a connecting pipe. The connecting pipe is connected to the outlet and the air suction machine respectively. The air suction machine is configured to evacuate the second kiln body.

[0060] <Material Guiding and Abrasive Equipment>

[0061] The material guiding and abrasive equipment of the present invention is located below the hot air inlet, and most of it is located inside the first kiln body. It is arranged to grind the falling material particles and to provide an upward-moving air flow for the ground powder.

[0062] The material guiding and abrasive equipment of the present invention includes a material guiding unit, an abrasive unit, a air supply unit and a motor unit. This is beneficial for grinding the large-particle materials that fall, so as to form powder that can move upward under the action of the air flow. This can avoid clogging the combustion chamber and is beneficial for improving the material recovery rate. The following is a detailed introduction.

[0063] Motor unit

[0064] The motor unit is fixed on the support seat. In some embodiments, the motor unit includes a motor and a main shaft. The motor is fixed on the support seat and is arranged to drive the main shaft to rotate. In the present invention, the motor can be a servo motor. The motor is located outside the first kiln body. The main shaft is arranged vertically. Most of the main shaft is located inside the first kiln body. The top of the main shaft is located inside the material guiding frame.

[0065] Material guiding unit

[0066] The material guiding unit includes a material guiding frame, a connecting rod and a blade.

[0067] The material guiding frame is a hollow structure and is arranged to be fixed on the inner side wall of the first kiln body through a connecting rod. The material guiding frame can be a cylindrical structure. The central axis of the material guiding frame coincides with the central axis of the main shaft. A bevel is provided at the top end of the material guiding frame. This can be beneficial for guiding the falling large-particle materials into the material guiding frame.

[0068] There can be multiple connecting rods, for example, more than four, and they are evenly distributed.

[0069] The blade is located inside the material guiding frame and above the abrasive unit. The blade is arranged on the main shaft and is arranged to rotate with the rotation of the main shaft and to generate a downward swirling wind. This can be beneficial for introducing the falling large-particle materials into the material guiding frame.

[0070] Abrasive unit

[0071] The abrasive unit of the present invention includes an abrasive plate and a perforated plate. The abrasive plate is arranged to rotate with the rotation of the main shaft, and due to the rotation of the abrasive plate, a grinding structure is formed between the abrasive plate and the perforated plate. This is beneficial for grinding the falling large-particle materials into ground powder.

[0072] In the present invention, the abrasive plate is arranged on the main shaft and is arranged to rotate with the main shaft. There are multiple abrasive plates and they are evenly distributed. Specifically, the abrasive plates are symmetrically distributed around the main shaft. The abrasive plate is located above the mesh plate with a set gap between the two. The abrasive plate grinds the falling material particles between the abrasive plate and the mesh plate by rotating (while the mesh plate is fixed).

[0073] In some embodiments, the abrasive plate includes an upper section and a lower section connected to each other, the upper section is located inside the material guide frame, and the lower section is located below the material guide frame. The upper section and the lower section are connected by an arc transition. The angle between the plane where the upper section is located and the central axis of the main shaft is 35 to 65°, for example, 45°. The shape of the outer contour of the lower section matches the shape of the inner side wall of the mesh plate.

[0074] In some specific embodiments, both the upper section and the lower section are fixed to the main shaft.

[0075] In the present invention, the mesh plate is located below the material guide frame and is fixedly connected to the material guide frame. The outer contour of the inner side wall of the mesh plate is in an arc-shaped funnel shape. The mesh plate is provided with a plurality of holes, and the holes are arranged to allow the ground powder to pass through.

[0076] Air supply unit

[0077] The air supply unit is arranged below the abrasive unit and is arranged to form an upward airflow, so that the ground material powder can move upward under the action of the airflow, and then enter the second kiln body through the first kiln body under the action of the hot airflow and be discharged.

[0078] In some specific embodiments, the air supply unit includes a plurality of fan blades, and the fan blades are arranged on a main shaft and are configured to rotate along with the rotation of the main shaft.

[0079] In the present invention, an air supply unit (fan blades), an abrasive unit and a material guide unit are provided, and downward vortex wind can be generated when the blades rotate, so that irregularly scattered large-particle materials (such as large-particle rare earth salts) can be effectively combined with the material guide frame and the groove above it, and are uniformly adsorbed on the inner surface of the mesh plate below the material guide frame with the vortex wind force, and then the large-particle materials are continuously ground and fall down from the holes of the mesh plate through the friction between the abrasive plate and the inner surface of the mesh plate during the rotation of the abrasive plate, and then the ground material powder is blown upward in combination with the arc-shaped mesh plate through the rotation of the fan blades. This structure can not only blow through and clean the materials blocked in the holes of the mesh plate to achieve the effect of anti-blocking, but also can combine with the super-strong hot air flow introduced into the combustion chamber to guide, intercept, return, grind, calcine and discharge the material powder blown upward again, thereby avoiding the large-particle materials from falling on the bottom of the first kiln body of the calcining kiln body, that is, avoiding the problem of clogging the combustion chamber during long-term calcination.

[0080] Embodiment 1

[0081] Figure 1 This is a schematic structural view of a rare earth salt calcination device of the present invention. Figure 2 is Figure 1 a schematic sectional view of Figure 3 This is a schematic sectional view of the material guiding and abrasive equipment of the present invention. Figure 4 is Figure 3 an enlarged schematic view of a partial area A in Figure 5 This is a schematic top view of the material guiding and abrasive equipment of the present invention.

[0082] The rare earth salt calcination device of the present invention can be used to calcine rare earth salts. This embodiment is described by taking the calcination of rare earth salts as an example. As Figure 1 and Figure 2 shown, the rare earth salt calcination device of the present invention includes a support base 1, a first kiln body 21, a second kiln body 22, a combustion device 4, a suction device 6, and a material guiding and abrasive equipment 8.

[0083] The support base 1 can be arranged on the ground. The first kiln body 21, the second kiln body 22, the combustion device 4, the suction device 6, and the material guiding and abrasive equipment 8 are respectively fixed on the support base 1.

[0084] The first kiln body 21 and the second kiln body 22 are vertically arranged, and their axes are parallel. Both of them are hollow structures. The top of the first kiln body 21 and the top of the second kiln body 22 are connected by an arc transition part. The three form an inverted U-shaped structure.

[0085] On the side wall of the first kiln body 21, there are a feed inlet 211 and a hot air flow inlet 212. The feed inlet 211 is located in the middle of the side wall of the first kiln body 21 and is used to add rare earth salts to be calcined. The hot air flow inlet 212 is located at the lower part of the side wall of the first kiln body 21. The feed inlet 211 and the hot air flow inlet 212 are located on the same side of the side wall of the first kiln body 21.

[0086] The first kiln body 21 is also provided with a retention chamber 213. The retention chamber 213 can divide the first kiln body 21 into an upper section and a lower section. The retention chamber 213 is located above the feed inlet 211 and is close to the feed inlet 211. The outer contour of the retention chamber 213 is similar to a sphere, and its maximum inner diameter is larger than the inner diameters of the upper section and the lower section of the first kiln body 21. In this way, large particles of rare earth salts can be intercepted.

[0087] At the lower part of the side wall of the second kiln body 22, there is a discharge outlet 221, which is used to discharge rare earth oxides (rare earth salts become rare earth oxides after calcination). The discharge outlet 221 is far from the hot air flow inlet 212.

[0088] The combustion device 4 includes a combustion chamber and a draft fan. The combustion chamber is capable of generating a hot air stream. The draft fan introduces the hot air stream generated by the combustion chamber into the first kiln body 21 through the hot air inlet 212.

[0089] The air suction device 6 includes an air suction fan 61 and a connecting pipe. The connecting pipe is respectively connected to the discharge port 221 and the air suction fan 61. The air suction fan 61 is capable of evacuating the second kiln body 22.

[0090] As Figures 2 to 5 shown, the feeding and abrasive device 8 is located below the hot air inlet 212, and most of it is located inside the first kiln body 21. The feeding and abrasive device 8 can grind the falling rare earth salt particles, and make the ground rare earth salt powder move upward under the action of the air flow, enter the second kiln body 22 through the first kiln body 21 and be discharged after calcination.

[0091] As Figures 2 - 3 shown, the feeding and abrasive device 8 includes a feeding unit 81, an abrasive unit 82, a air supply unit 83 and a motor unit 84.

[0092] The motor unit 84 includes a main shaft 841 and a motor. The motor can be a servo motor. The main shaft 841 is vertically arranged. The motor is fixed on the support base 1, and the motor can drive the main shaft 841 to rotate.

[0093] As Figure 3 shown, the feeding unit 81 includes a feeding frame 811, a connecting rod 812 and blades 813. The feeding frame 811 is a hollow structure. The feeding frame 811 can be fixed on the inner side wall of the first kiln body 21 through the connecting rod 812, that is, one end of the connecting rod 812 is connected to the feeding frame 811, and the other end is connected to the inner side wall of the first kiln body 21. The feeding frame 811 is a cylindrical structure. A groove 8111 is provided at the top of the feeding frame 811. The blades 813 are located inside the feeding frame 811 and above the abrasive unit 82. The blades 813 are arranged on the main shaft 841, and the blades 813 can rotate with the rotation of the main shaft 841, and it can generate a downward swirling wind, so as to guide the falling rare earth salt particles into the feeding frame 811.

[0094] As Figures 4 - 5As shown in the figure, the abrasive unit 82 includes an abrasive plate 821 and a perforated plate 822. The abrasive plate 821 is arranged on the main shaft 841, and the abrasive plate 821 can rotate with the rotation of the main shaft 841. The abrasive plate 821 is located above the perforated plate 822, and there is a set gap between the two. The abrasive plate 821 rotates while the perforated plate is fixed, so as to be able to grind the falling rare earth salt particles. There are multiple abrasive plates 821, which are symmetrically distributed around the main shaft 841. The abrasive plate 821 includes an upper section and a lower section connected to each other. The upper section is located inside the material guiding frame 811, and the lower section is located below the material guiding frame 811. The upper section and the lower section are connected by an arc transition. The included angle between the plane where the upper section is located and the central axis of the main shaft 841 is 35-65°, for example 45°. The shape of the outer contour of the lower section matches the shape of the inner side wall of the perforated plate 822. Multiple holes are provided on the perforated plate 822. The holes can allow the ground rare earth salt powder to pass through and prevent large particle rare earth salts from passing through. The perforated plate 822 is located below the material guiding frame 811 and is fixedly connected to the material guiding frame 811. The outer contour of the inner side wall of the perforated plate 822 is in the shape of an arc-shaped funnel.

[0095] As Figure 3 shown in the figure, the air supply unit 83 is located below the abrasive unit 82 and can generate an upward air flow. The air supply unit 83 includes multiple fan blades 831. The fan blades 831 are arranged on the main shaft 841, and the fan blades 831 can rotate with the rotation of the main shaft 841. The rotation of the fan blades 831 can generate an upward air flow, so that the ground rare earth salt powder moves upward.

[0096] The working principle of the rare earth salt calcination device of this embodiment is introduced below:

[0097] When the rare earth salt enters through the feed port 211, it will cooperate with the flow guiding machine connected to the combustion chamber to blow the heat flow in the combustion chamber into the first kiln body 21, so that the heat flow temperature in the entire calcination kiln body (including the first kiln body 21 and the second kiln body 22) reaches a high temperature state. At the same time, the introduced heat flow will generate a super strong air flow, and the rare earth salt introduced through the feed port 211 will be calcined during the process of being drained from the feed port 211 to the discharge port 221 in the calcination kiln body. The suction fan 61 has the function of draining and sucking out the rare earth oxide. Since the powder-like rare earth salt is calcined, the air flow speed of the drained air flow is certain, and the sizes of the powder-like rare earth salt particles themselves are uneven. The small particle rare earth salt powder will be drained and calcined along with the air flow, and then discharged after calcination, while the large particle rare earth salt will fall and discharge from the area of the interception chamber 213. The qualified small particles will be taken away by the wind drainage and discharged after calcination;

[0098] When large particles of rare earth salt are falling, the servo motor is started to drive the main shaft 841 to rotate. The rotation of the main shaft 841 drives the fan blade 831, the abrasive plate 821 and the blade 813 to rotate simultaneously. Since the curvature of the blades 813 distributed in the array is in a downward vortex shape, when the blades 813 rotate, downward vortex wind can be generated, so that the irregularly scattered large particles of rare earth salt can be effectively combined with the guide frame 811 and the groove 8111 above. With the vortex wind force, it is evenly adsorbed on the inner surface of the mesh plate 822 below the guide frame 811, and then the mesh plate 822 is abraded by the rotation of the abrasive plate 821. 2, the large-particle rare earth salt carried by the inner surface is continuously ground, and the qualified rare earth salt will fall down from the holes of the mesh plate 822, and then the rare earth salt powder after grinding will be blown upward in cooperation with the arc-shaped mesh plate 822 through the rotation of the fan blade 831, which can not only blow through and clean the rare earth salt blocked in the holes of the mesh plate 822, and play an anti-blocking effect, but also can cooperate with the super-strong hot air flow introduced into the combustion chamber to guide the rare earth salt blown upward again, intercept and return the material in the interception chamber 213, re-grind, calcine and discharge the material, and the feed port 211 also continuously introduces the rare earth salt into the first kiln body 21. Continuing the above operation, not only can the unqualified rare earth salt be intercepted and returned and ground, but also large particles of rare earth salt can be prevented from precipitating at the bottom of the first kiln body 21. In this way, the problem of clogging the combustion chamber during long-term calcination can be avoided.

[0099] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement and substitution that can be conceived by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A rare earth salt calcination device, characterized in that, It includes a first kiln body, a second kiln body, a combustion device, an air suction device and a material guiding and abrasive device; among them, the first kiln body and the second kiln body are vertically arranged, their axes are parallel, and both are hollow structures; the top of the first kiln body and the top of the second kiln body are connected by an arc transition part; a feed inlet and a hot air flow inlet are arranged on the side wall of the first kiln body; the feed inlet is located in the middle of the side wall and is used for adding rare earth salts; the hot air flow inlet is located at the lower part of the side wall; a retention chamber is arranged on the first kiln body, which divides the first kiln body into an upper section and a lower section; the retention chamber is located above the feed inlet and close to the feed inlet; the maximum inner diameter of the retention chamber is larger than the inner diameters of the upper section and the lower section of the first kiln body; a discharge outlet is arranged at the lower part of the side wall of the second kiln body for discharging rare earth oxides; the combustion device is configured to generate hot air flow and is configured to introduce the hot air flow into the first kiln body through the hot air flow inlet; the air suction device is configured to extract air from the second kiln body through the discharge outlet; the material guiding and abrasive device is located below the hot air flow inlet, most of which is located in the first kiln body, and is configured to grind the falling material particles and is configured to provide an air flow that enables the ground powder to move upward.

2. The rare earth salt calcination device according to claim 1, characterized in that, It further includes a support seat; the first kiln body, the second kiln body, the combustion device, the air suction device and the material guiding and abrasive device are respectively fixed on the support seat.

3. The rare earth salt calcination device according to claim 2, characterized in that, The material guiding and abrasive device includes a material guiding unit, an abrasive unit, a air supply unit and a motor unit; the motor unit is fixed on the support seat and includes a main shaft; the main shaft is configured to be able to rotate; the material guiding unit includes a material guiding frame and a connecting rod; the material guiding frame is a hollow structure and is configured to be fixed on the inner side wall of the first kiln body through the connecting rod; the central axis of the material guiding frame coincides with the central axis of the main shaft; the abrasive unit includes an abrasive plate and a perforated plate; the abrasive plate is arranged on the main shaft and is configured to rotate with the rotation of the main shaft; the abrasive plate is located above the perforated plate, and there is a set gap between the two, and the abrasive plate and the perforated plate are configured to grind the falling material particles; a plurality of holes are arranged on the perforated plate, and the holes are configured to allow the ground powder to pass through; the air supply unit is arranged below the abrasive unit and is configured to generate an upward air flow.

4. The rare earth salt calcination device according to claim 3, wherein: the motor unit further includes a motor; the motor is fixed on the support seat and is configured to drive the main shaft to rotate; the material guiding unit further includes blades, which are located inside the material guiding frame and above the abrasive unit; the blades are arranged on the main shaft and are configured to rotate with the rotation of the main shaft and are configured to generate a downward swirling wind; the air supply unit includes a plurality of fan blades, and the fan blades are arranged on the main shaft and are configured to rotate with the rotation of the main shaft.

5. The rare earth salt calcination device according to claim 4, wherein: The material guiding frame is of a cylindrical structure; a bevel is provided at the top end of the material guiding frame; There are multiple abrasive plates, symmetrically distributed around the main shaft; the abrasive plate includes an upper section and a lower section connected to each other, the upper section is located inside the material guiding frame, and the lower section is located below the material guiding frame.

6. The rare earth salt calcination device according to claim 5, wherein, The upper section and the lower section are connected in an arc transition; the angle between the plane where the upper section is located and the central axis of the main shaft is 35-65°; the shape of the outer contour of the lower section matches the shape of the inner side wall of the mesh plate.

7. The rare earth salt calcination device according to claim 6, wherein, The mesh plate is located below the material guiding frame, and the mesh plate is fixedly connected to the material guiding frame; the outer contour of the inner side wall of the mesh plate is in the shape of an arc-shaped funnel.

8. The rare earth salt calcination device according to claim 1, characterized in that, The feed inlet and the hot air inlet are on the same side of the side wall of the first kiln body; the discharge outlet is far from the hot air inlet.

9. The rare earth salt calcination device according to any one of claims 1 to 8, characterized in that, The air suction device includes an air suction fan and a connecting pipe, and the connecting pipe is respectively connected to the discharge outlet and the air suction fan; the air suction fan is arranged to be able to extract air from the second kiln body.

10. The rare earth salt calcination device according to claim 9, characterized in that, The combustion device includes a combustion chamber and a flow guiding machine; the combustion chamber is arranged to be able to generate hot air; the flow guiding machine is arranged to introduce the hot air generated by the combustion chamber into the first kiln body through the hot air inlet.

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