Rotary kiln equipment and calcining method thereof

Abstract

The invention relates to the technical field of kilns, and provides rotary kiln equipment and a calcining method thereof.The rotary kiln equipment comprises a rack, a furnace core barrel, a material inlet device with a feeding port, a smoke sinking chamber, a kiln head cover with a discharging port and a driving device; the furnace core barrel is divided into a material preheating area, a temperature-controllable dechlorination and desulfurization area, a temperature-controllable carbonate decomposition area and an air distribution preheating area in the material inlet and outlet direction; electromagnetic induction devices are respectively arranged on the furnace core barrel corresponding to the temperature-controllable dechlorination and desulfurization area and the temperature-controllable carbonate decomposition area; the material preheating area, the temperature-controllable dechlorination and desulfurization area and the temperature-controllable carbonate decomposition area are respectively provided with thermocouples for monitoring temperature; the kiln head cover is provided with an air distribution port, and the smoke sinking chamber is provided with a smoke exhaust port. The problem that a traditional resistance heating rotary kiln cannot be used due to the fact that a rare earth carbonate material cannot be calcined into rare earth oxide at the temperature can be solved, the precise temperature interval control function is achieved, and the quality of calcined products can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of kilns, and more specifically, to a rotary kiln device and a calcining method thereof. Background Art

[0002] At present, rare earth carbonate is mainly processed and calcined by static calcination in roller kiln, static calcination in tunnel kiln or dynamic calcination in rotary kiln.

[0003] Since rare earth carbonate materials have poor thermal conductivity and are dense, the burnt products are discharged slowly, resulting in a long firing cycle (generally about 24 hours) when static calcination is used. In addition, static calcination requires the use of a large number of saggers or carriers to support the firing, resulting in a large amount of energy loss and loss of consumables.

[0004] The dynamic calcination method is the opposite. Since the stirring effect of the rotary kiln can greatly increase the calcination speed of the rare earth carbonate material, it can be increased to at least 2 hours of discharge, so this calcination method can reduce the calcination cycle time. However, since the traditional resistance-heated rotary kiln is a partition heating method, it cannot reach a calcination temperature of 1000°C, so it cannot be used in the process of calcining rare earth carbonate materials into rare earth oxides. In addition, the temperature range in the furnace of the traditional gas-heated rotary kiln cannot be accurately controlled, which easily leads to excessively high local temperatures, which not only makes the calcined product quality lower, but also the low-temperature calcination time is too short, resulting in substandard chloride and sulfate emissions in the rare earth carbonate material. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and provide a rotary kiln device; the rotary kiln device can not only solve the problem that the traditional resistance heating rotary kiln cannot reach the temperature for calcining rare earth carbonate materials into rare earth oxides and cannot be used, but also has a precise temperature range control function, thereby improving the quality of the calcined product. The present invention also provides a calcination method for the rotary kiln device, which can improve the quality of the calcined product and reduce heat energy loss.

[0006] In order to achieve the above-mentioned object, the present invention is implemented through the following technical scheme: a rotary kiln device, including a frame, a furnace core cylinder, a material inlet device with a feed port, a smoke settling chamber, a kiln head cover with a discharge port and a driving device; the furnace core cylinder is arranged on the frame and tilted by the frame, and the two ends of the furnace core cylinder are rotatably connected to the smoke settling chamber and the kiln head cover respectively; the end of the furnace core cylinder connected to the smoke settling chamber is connected to the material inlet device; the driving device is connected to the furnace core cylinder to realize driving the furnace core cylinder to rotate; The furnace core cylinder is divided into a material preheating zone, a temperature-controlled dechlorination and desulfurization zone, a temperature-controlled carbonate decomposition zone and an air distribution preheating zone along the material inlet and outlet direction; the furnace core cylinders corresponding to the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone are respectively provided with electromagnetic induction devices; the material preheating zone, the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone are respectively provided with thermocouples for temperature monitoring; The kiln head cover is provided with an air distribution port, and the smoke settling chamber is provided with a smoke exhaust port, so as to realize convection heat transfer inside the furnace core cylinder.

[0007] In the above scheme, the present invention can adjust the temperature of the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone through an electromagnetic induction device according to the monitoring temperature fed back by the thermocouple, so as to achieve the effect of accurate and real-time temperature control, and solve the problem that the traditional resistance-heated rotary kiln cannot reach the temperature for calcining the carbonate rare earth material into rare earth oxide, resulting in the inability to use it. In addition, the precise temperature range control function of the present invention can provide sufficient time for dechlorination and desulfurization during the material calcination cycle, avoiding excessive chloride and sulfate in the product due to insufficient dechlorination and desulfurization caused by too fast a temperature rise.

[0008] In addition, due to the flame heat transfer characteristics of the burner, the temperature inside the cylinder of the traditional gas rotary kiln changes linearly. In order to ensure that the cylinder has a certain length of carbonate decomposition temperature interval, the local temperature in the interval often needs to be higher than the carbonate decomposition temperature to avoid insufficient carbonate decomposition. However, the traditional gas rotary kiln will cause more energy loss, and the higher maximum firing temperature will affect the characteristics of the product and the subsequent processing of the product. The rotary kiln equipment of the present invention can control the temperature more accurately, which can solve the above problems of the traditional gas rotary kiln, reduce energy loss, and thus improve the quality of the calcined product.

[0009] The smoke exhaust port is connected in sequence to a smoke exhaust regulating valve and a smoke exhaust mixing fan; The smoke settling chamber is provided with a pressure gauge for monitoring the internal pressure of the furnace core cylinder; the pressure gauge is connected to the smoke exhaust regulating valve and the smoke exhaust stirring fan through a controller, so that the frequency of the smoke exhaust stirring fan and / or the opening of the smoke exhaust regulating valve can be adjusted through the controller according to the monitored pressure data.

[0010] The rotary kiln equipment of the present invention has a flue gas air distribution disturbance function, which can enhance the gas movement inside the furnace core cylinder, promote the dechlorination and desulfurization and carbonate decomposition gas emission. Compared with the traditional gas-fired rotary kiln, the rotary kiln equipment of the present invention adopts electromagnetic induction device heating to reduce a large amount of flue gas emissions and achieve energy-saving effect. However, if there is no flue gas disturbance effect, the decomposition reaction of rare earth carbonate and dechlorination and desulfurization will be inhibited, and the convective heat transfer effect inside the furnace core cylinder will also be reduced. The smoke exhaust port of the rotary kiln equipment of the present invention is provided with a smoke exhaust stirring fan and a smoke exhaust regulating valve, and the kiln head cover is provided with an air distribution port (to prevent dust), and the smoke settling chamber is provided with a pressure gauge to monitor the internal pressure of the furnace core cylinder. The frequency of the smoke exhaust stirring fan and / or the opening of the smoke exhaust regulating valve can be adjusted according to the feedback of the pressure gauge, so that the inside of the furnace core cylinder is slightly negative pressure, which can avoid excessive cold air from entering the furnace core cylinder and causing increased energy consumption. In addition, cold air enters from the air distribution port and passes through the non-heated air distribution preheating zone. The cold air exchanges heat with the material to promote the decomposition reaction and dechlorination and desulfurization reaction of the material. It can also cool the calcined product and increase the temperature of the exhaust gas flow, thereby reducing the heating energy consumption in the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone.

[0011] A heat insulation layer is provided between the furnace core cylinder corresponding to the temperature-controllable dechlorination and desulfurization zone and the temperature-controllable carbonate decomposition zone and the electromagnetic induction device. The heat insulation layer can be made of aerogel material, which can not only reduce heat dissipation, but also avoid thermal damage to the electromagnetic induction device caused by high temperature.

[0012] A magnetically conductive metal lifting plate is arranged inside the furnace core cylinder; the lifting plate is a double helix structure arranged on the inner wall of the furnace core cylinder.

[0013] The lifting plates located in the temperature-controllable dechlorination and desulfurization zone and the temperature-controllable carbonate decomposition zone can generate heat through an electromagnetic induction device, thereby heating the exhaust gas flow and materials discharged from the exhaust port.

[0014] The metal lifting plate of the present invention generates heat in the temperature-controllable dechlorination and desulfurization zone and the temperature-controllable carbonate decomposition zone equipped with electromagnetic induction devices, which can heat the exhaust gas flow and materials, and also has the effect of spiral turbulence and wind guidance, thereby increasing the heat exchange effect on the materials in the furnace core cylinder, and also has the effect of stirring the materials to promote calcination.

[0015] A plurality of partitions are arranged radially inside the furnace core cylinder, each of which is provided with a discharge hole for materials to pass through; a plurality of magnetically conductive steel balls are placed between adjacent partitions, and when the furnace core cylinder rotates, the steel balls roll between adjacent partitions.

[0016] The steel balls located in the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone can generate heat through an electromagnetic induction device, thereby increasing the contact area for heating the materials and stirring the materials to promote the calcination of the materials.

[0017] The furnace core cylinder is tilted at an angle of 0.5° to 2° along the material inlet and outlet direction; when the furnace core cylinder rotates, the stacking height of the steel balls is less than half of the height of the partition.

[0018] The furnace core barrel of the rotary kiln equipment of the present invention is equipped with magnetically conductive steel balls. During the rotation of the rotary kiln equipment, the material is dynamically calcined, and the heated steel balls can increase the contact area of ​​the material heating, and stir the material at the same time, thereby promoting the calcination of the material. In addition, the steel balls can also grind the material to prevent the material from agglomerating during the calcination process, resulting in insufficient calcination, and can also slow down the material from sticking to the wall. The furnace core barrel of the present invention is equipped with partitions at several locations to allow the material to pass through and block the steel balls, so that the steel balls do not take away energy consumption during the calcination of the material. During the rotation of the rotary kiln equipment, since the inclination angle of the rotary kiln is only 0.5°~2°, the steel balls will not slide down and stack when the furnace core barrel rotates at a slower rotation speed. Generally, the stacking height of the steel balls is less than half of the height of the partition.

[0019] A calcining method for a rotary kiln device, using the above rotary kiln device, the calcining method comprises: a driving device drives the furnace core cylinder to rotate, the material enters the inclined furnace core cylinder and sequentially passes through a material preheating zone, a temperature-controlled dechlorination and desulfurization zone, a temperature-controlled carbonate decomposition zone and an air distribution preheating zone for calcination, and the calcined product is discharged from a discharge port of a kiln head cover; During the material calcination process, thermocouples are used to monitor the temperature of the material preheating zone, the temperature-controlled dechlorination and desulfurization zone, and the temperature-controlled carbonate decomposition zone. The induction power of the electromagnetic induction device is adjusted according to the temperature feedback from the thermocouple monitoring, so as to achieve precise temperature control of the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone. The smoke exhaust port is provided with a smoke exhaust stirring fan, and the smoke generated by the calcination of the material is discharged from the smoke exhaust port; the external air entering from the air distribution port exchanges heat with the material to promote the decomposition reaction and dechlorination and desulfurization reaction of the material, cool the calcined product, and increase the temperature of the smoke exhaust gas flow to reduce the heating energy consumption of the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone.

[0020] A magnetically conductive metal lifting plate with a double helix structure is arranged on the inner wall of the furnace core cylinder; the lifting plates located in the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone are heated by an electromagnetic induction device, and the airflow of the furnace core cylinder is disturbed and guided to increase the heat exchange effect of the material, and the material is stirred, and the exhaust gas flow and the material are heated to promote the calcination of the material; A number of magnetic steel balls are placed in sections separated by partitions in the furnace core cylinder, and the steel balls located in the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are heated by an electromagnetic induction device. When the furnace core cylinder rotates, the material passes through the partition, and the heated steel balls rolling between adjacent partitions heat, stir and grind the material, thereby promoting the calcination of the material. At this time, the stacking height of the steel balls is less than half the height of the partition.

[0021] The advantages of the rotary kiln equipment of the present invention are: 1. Compared with the traditional gas-fired rotary kiln, the present invention has a more accurate setting of the firing cycle and firing temperature, which improves the quality of the calcined product. 2. Compared with the traditional resistance-heated rotary kiln, the present invention has an airflow stirring function, which enhances convective heat exchange and promotes flue gas emission. At the same time, it can promote the decomposition reaction and dechlorination and desulfurization reaction of the material, cool the calcined product, and increase the temperature of the exhaust gas flow to reduce the heating energy consumption of the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone. 3. The furnace core cylinder is provided with a heat-generating lifting plate, which increases the material heating area. At the same time, it also has the function of spiral turbulence stirring wind, which promotes the calcination of the material.

[0022] 4. The furnace core cylinder has heat-generating steel balls, which increase the heating area of ​​the material and also have the function of stirring and grinding the material.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The rotary kiln equipment of the present invention can not only solve the problem that the traditional resistance heating rotary kiln cannot reach the temperature for calcining rare earth carbonate materials into rare earth oxides and cannot be used, but also has a precise temperature range control function, thereby improving the quality of the calcined products.

[0024] 2. The calcination method of the rotary kiln equipment of the present invention can improve the quality of the calcined product and reduce heat energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a rotary kiln device of the present invention; Figure 2 It is a schematic diagram of a furnace core cylinder in a rotary kiln device of the present invention; Among them, 1 is a frame, 2 is a furnace core cylinder, 3 is a feed port, 4 is a material inlet device, 5 is a smoke settling chamber, 6 is a discharge port, 7 is a kiln head cover, 8 is a driving device, 9 is a material preheating zone, 10 is a controllable temperature dechlorination and desulfurization zone, 11 is a controllable temperature carbonate decomposition zone, 12 is an air distribution preheating zone, 13 is an electromagnetic induction coil, 14 is a thermocouple, 15 is an air distribution port, 16 is a smoke exhaust port, 17 is a smoke exhaust regulating valve, 18 is a smoke exhaust stirring fan, 19 is a pressure gauge, 20 is a thermal insulation layer, 21 is a lifting plate, 22 is a partition, 22.1 is a discharge hole, and 23 is an air hammer. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Example like Figure 1 and Figure 2 As shown, the rotary kiln equipment of the present invention comprises a frame 1, a furnace core barrel 2, a material inlet device 4 with a feed port 3, a smoke settling chamber 5, a kiln head cover 7 provided with a discharge port 6, and a driving device 8, wherein the furnace core barrel 2 is arranged on the frame 1 and tilted through the frame 1, the two ends of the furnace core barrel 2 are rotatably connected to the smoke settling chamber 5 and the kiln head cover 7 respectively, the end of the furnace core barrel 2 connected to the smoke settling chamber 5 is connected to the material inlet device 4, the material inlet device 4 feeds the material into the furnace core barrel 2, and the driving device 8 is connected to the furnace core barrel 2 to drive the furnace core barrel 2 to rotate. In order to prevent the calcined product from sticking to the kiln head cover 7 and making it difficult to discharge, the present invention arranges an air hammer 23 on the upper part of the discharge port 6, and the external compressed air starts the air hammer 23 to achieve vibration of the outer wall of the kiln head cover 7 on the upper part of the discharge port 6, so that the calcined product can be discharged smoothly.

[0028] The furnace core cylinder 2 of the present invention is divided into a material preheating zone 9, a temperature-controlled dechlorination and desulfurization zone 10, a temperature-controlled carbonate decomposition zone 11 and an air distribution preheating zone 12 along the material inlet and outlet direction, wherein the furnace core cylinder 2 corresponding to the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11 is respectively provided with an electromagnetic induction coil 13, and the material preheating zone 9, the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11 are respectively provided with a thermocouple 14 for temperature monitoring. For the convection heat transfer inside the furnace core cylinder 2, the kiln head hood 7 is provided with an air distribution port 15, and the smoke settling chamber 5 is provided with a smoke exhaust port 16.

[0029] The smoke exhaust port 16 of the present invention is connected in sequence to a smoke exhaust regulating valve 17 and a smoke exhaust stirring fan 18. The smoke settling chamber 5 is provided with a pressure gauge 19 for monitoring the internal pressure of the furnace core cylinder 2. The pressure gauge 19 is connected to the smoke exhaust regulating valve 17 and the smoke exhaust stirring fan 18 through a controller, so that the frequency of the smoke exhaust stirring fan 18 and / or the opening of the smoke exhaust regulating valve 17 can be adjusted through the controller according to the monitored pressure data.

[0030] A heat insulation layer 20 is provided between the furnace core barrel 2 and the electromagnetic induction coil 13 corresponding to the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11 of the present invention. The heat insulation layer 20 can be made of aerogel material, which can not only reduce heat dissipation, but also avoid thermal damage to the electromagnetic induction coil 13 caused by high temperature.

[0031] The furnace core cylinder 2 of the present invention is provided with a magnetically conductive metal lifting plate 21, which is a double helix structure and is provided on the inner wall of the furnace core cylinder 2. The lifting plate 21 located in the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11 can generate heat through the electromagnetic induction coil 13, thereby heating the exhaust gas flow and materials discharged from the exhaust port 16. The metal lifting plate 21 of the present invention generates heat in the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11 provided with the electromagnetic induction coil 13, thereby heating the exhaust gas flow and materials, and also has the effect of spiral turbulence and wind guiding, thereby increasing the heat exchange effect of the materials in the furnace core cylinder 2, and also has the effect of stirring the materials to promote calcination.

[0032] The furnace core barrel 2 of the present invention is provided with a plurality of partitions 22 along the radial direction, and each partition 22 is provided with a discharge hole 22.1 for the material to pass through; a plurality of magnetically conductive steel balls (not shown) are placed between adjacent partitions 22, and when the furnace core barrel 2 rotates, the steel balls roll between the adjacent partitions 22. The steel balls located in the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11 can generate heat through the electromagnetic induction coil 13, thereby increasing the contact area for heating the material and stirring the material to promote the calcination of the material. In addition, the furnace core barrel 2 is inclined at an angle of 0.5° to 2° along the material inlet and outlet direction, and when the furnace core barrel 2 rotates, the stacking height of the steel balls is less than half the height of the partition 22.

[0033] The furnace core barrel 2 of the rotary kiln equipment of the present invention is equipped with magnetically conductive steel balls. During the rotation of the rotary kiln equipment, the material is dynamically calcined, and the heated steel balls can increase the contact area of ​​the material heating, and stir the material at the same time, thereby promoting the calcination of the material. In addition, the steel balls can also grind the material to prevent the material from agglomerating during the calcination process, resulting in insufficient calcination, and can also slow down the material from sticking to the wall. The furnace core barrel 2 of the present invention is equipped with partitions 22 at several locations, which allow the material to pass through and block the steel balls, so that the steel balls do not take away energy consumption during the material calcination process. During the rotation of the rotary kiln equipment, since the inclination angle of the rotary kiln is only 0.5°~2°, the steel balls will not slide down and stack when the furnace core barrel 2 rotates at a slower rotation speed. Generally, the stacking height of the steel balls is less than half the height of the partition 22.

[0034] The calcination method of the rotary kiln equipment of the present invention adopts the above-mentioned rotary kiln equipment, and the calcination method is as follows: the driving device 8 drives the furnace core cylinder 2 to rotate, the material enters the inclined furnace core cylinder 2 and passes through the material preheating zone 9, the temperature-controlled dechlorination and desulfurization zone 10, the temperature-controlled carbonate decomposition zone 11 and the air distribution preheating zone 12 in sequence for calcination, and the calcined product is discharged from the discharge port 6 of the kiln head cover 7; During the material calcination process, a thermocouple 14 is used to monitor the temperature of the material preheating zone 9, the temperature-controlled dechlorination and desulfurization zone 10, and the temperature-controlled carbonate decomposition zone 11. The induced electric power of the electromagnetic induction coil 13 is adjusted according to the temperature monitored and fed back by the thermocouple 14, so as to achieve precise temperature control of the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11. The smoke exhaust port 16 is provided with a smoke exhaust stirring fan 18, and the smoke generated by the calcination of the material is discharged from the smoke exhaust port 16; the external air entering from the air distribution port 15 exchanges heat with the material to promote the decomposition reaction and dechlorination and desulfurization reaction of the material, cool the calcined product, and increase the temperature of the smoke exhaust gas flow to reduce the heating energy consumption of the temperature-controlled dechlorination and desulfurization zone 10 and the temperature-controlled carbonate decomposition zone 11.

[0035] A magnetically conductive metal lifting plate 21 with a double helix structure is arranged on the inner wall of the furnace core cylinder 2; the lifting plates 21 located in the temperature-controllable dechlorination and desulfurization zone 10 and the temperature-controllable carbonate decomposition zone 11 are heated by the electromagnetic induction coil 13, and the airflow of the furnace core cylinder 2 is disturbed and guided to increase the heat exchange effect of the material, and the material is stirred, and the exhaust gas flow and the material are heated to promote the calcination of the material; A plurality of magnetically conductive steel balls are placed in sections separated by partitions 22 in the furnace core cylinder 2, and the steel balls located in the temperature-controllable dechlorination and desulfurization zone 10 and the temperature-controllable carbonate decomposition zone 11 are heated by the electromagnetic induction coil 13; when the furnace core cylinder 2 rotates, the material passes through the partition 22, and the heating steel balls rolling between adjacent partitions 22 heat, stir and grind the material, thereby promoting the calcination of the material; at this time, the stacking height of the steel balls is less than half the height of the partition 22.

[0036] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A rotary kiln device, characterized in that: It comprises a frame, a furnace core cylinder, a material inlet device with a material feed port, a smoke settling chamber, a kiln head cover with a material discharge port, and a driving device; the furnace core cylinder is arranged on the frame and tilted by the frame, and the two ends of the furnace core cylinder are rotatably connected to the smoke settling chamber and the kiln head cover respectively; the end of the furnace core cylinder connected to the smoke settling chamber is connected to the material inlet device; the driving device is connected to the furnace core cylinder to realize driving the furnace core cylinder to rotate; The furnace core cylinder is divided into a material preheating zone, a temperature-controlled dechlorination and desulfurization zone, a temperature-controlled carbonate decomposition zone and an air distribution preheating zone along the material inlet and outlet direction; the furnace core cylinders corresponding to the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone are respectively provided with electromagnetic induction devices; the material preheating zone, the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone are respectively provided with thermocouples for temperature monitoring; The kiln head cover is provided with an air distribution port, and the smoke settling chamber is provided with a smoke exhaust port, so as to realize convection heat transfer inside the furnace core cylinder.

2. The rotary kiln equipment according to claim 1, characterized in that: The smoke exhaust port is connected in sequence to a smoke exhaust regulating valve and a smoke exhaust mixing fan; The smoke settling chamber is provided with a pressure gauge for monitoring the internal pressure of the furnace core cylinder; the pressure gauge is connected to the smoke exhaust regulating valve and the smoke exhaust stirring fan through a controller, so that the frequency of the smoke exhaust stirring fan and / or the opening of the smoke exhaust regulating valve can be adjusted through the controller according to the monitored pressure data.

3. The rotary kiln equipment according to claim 1, characterized in that: A heat insulation layer is arranged between the furnace core cylinder corresponding to the temperature-controllable dechlorination and desulfurization zone and the temperature-controllable carbonate decomposition zone and the electromagnetic induction device.

4. The rotary kiln equipment according to claim 1, characterized in that: A magnetically conductive metal lifting plate is arranged inside the furnace core cylinder; the lifting plate is a double helix structure arranged on the inner wall of the furnace core cylinder.

5. The rotary kiln equipment according to claim 4, characterized in that: The lifting plates located in the temperature-controllable dechlorination and desulfurization zone and the temperature-controllable carbonate decomposition zone can generate heat through an electromagnetic induction device, thereby heating the exhaust gas flow and materials discharged from the exhaust port.

6. The rotary kiln equipment according to claim 1, characterized in that: A plurality of partitions are arranged radially inside the furnace core cylinder, each of which is provided with a discharge hole for materials to pass through; a plurality of magnetically conductive steel balls are placed between adjacent partitions, and when the furnace core cylinder rotates, the steel balls roll between adjacent partitions.

7. The rotary kiln equipment according to claim 6, characterized in that: The steel balls located in the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone can generate heat through an electromagnetic induction device, thereby increasing the contact area for heating the materials and stirring the materials to promote the calcination of the materials.

8. The rotary kiln equipment according to claim 6, characterized in that: The furnace core cylinder is tilted at an angle of 0.5° to 2° along the material inlet and outlet direction; when the furnace core cylinder rotates, the stacking height of the steel balls is less than half of the height of the partition.

9. A calcining method for a rotary kiln device, using the rotary kiln device according to any one of claims 1 to 8, characterized in that: The calcination method comprises the following steps: a driving device drives the furnace core cylinder to rotate, the material enters the inclined furnace core cylinder and sequentially passes through a material preheating zone, a temperature-controlled dechlorination and desulfurization zone, a temperature-controlled carbonate decomposition zone and an air distribution preheating zone for calcination, and the calcined product is discharged from a discharge port of a kiln head cover; During the material calcination process, thermocouples are used to monitor the temperature of the material preheating zone, the temperature-controlled dechlorination and desulfurization zone, and the temperature-controlled carbonate decomposition zone. The induction power of the electromagnetic induction device is adjusted according to the temperature feedback from the thermocouple monitoring, so as to achieve precise temperature control of the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone. The smoke exhaust port is provided with a smoke exhaust stirring fan, and the smoke generated by the calcination of the material is discharged from the smoke exhaust port; the external air entering from the air distribution port exchanges heat with the material to promote the decomposition reaction and dechlorination and desulfurization reaction of the material, cool the calcined product, and increase the temperature of the smoke exhaust gas flow to reduce the heating energy consumption of the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone.

10. The calcining method of the rotary kiln equipment according to claim 9, characterized in that: A magnetically conductive metal lifting plate with a double helix structure is arranged on the inner wall of the furnace core cylinder; the lifting plates located in the temperature-controlled dechlorination and desulfurization zone and the temperature-controlled carbonate decomposition zone are heated by an electromagnetic induction device, and the airflow of the furnace core cylinder is disturbed and guided to increase the heat exchange effect of the material, and the material is stirred, and the exhaust gas flow and the material are heated to promote the calcination of the material; A number of magnetic steel balls are placed in sections separated by partitions in the furnace core cylinder, and the steel balls located in the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are heated by an electromagnetic induction device. When the furnace core cylinder rotates, the material passes through the partition, and the heated steel balls rolling between adjacent partitions heat, stir and grind the material, thereby promoting the calcination of the material. At this time, the stacking height of the steel balls is less than half the height of the partition.

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