A rotary kiln apparatus and calcination method thereof

Abstract

The present application relates to the technical field of kiln, and provides a rotary kiln equipment and a calcining method thereof, the rotary kiln equipment comprising a rack, a furnace core cylinder, a material inlet device with a feeding port, a smoke settling chamber, a kiln head cover provided with a discharging port and a driving device; the furnace core cylinder is divided into a material preheating zone, a controllable temperature dechlorination and desulfurization zone, a controllable temperature carbonate decomposition zone and a wind distribution preheating zone along the material inlet and outlet direction; the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are respectively provided with electromagnetic induction devices corresponding to the furnace core cylinder; the material preheating zone, the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are respectively provided with thermocouples for temperature monitoring; the kiln head cover is provided with a wind distribution port, and the smoke settling chamber is provided with a smoke exhaust port. The present application not only solves the problem that the traditional resistance heating rotary kiln cannot reach the calcination temperature of rare earth carbonate material to rare earth oxide, thereby cannot be used, but also has the function of precise temperature interval control, and can improve the quality of the calcined products.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kiln, more particularly, to a rotary kiln device and a calcining method thereof. BACKGROUND

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

[0003] Due to poor heat conductivity of rare earth carbonate material and dense material, the slow discharge of burned products leads to long firing cycle time (about 24 hours) when static calcination is used, and a large number of sagger or carrier is needed to support the burning, resulting in a large amount of energy loss and consumable loss.

[0004] On the contrary, the dynamic calcination method can reduce the firing cycle time, because the stirring action of the rotary kiln can greatly improve the firing speed of the rare earth carbonate material, at least to 2 hours of discharge. However, the traditional resistance heating rotary kiln is a partition heating method, which cannot reach the calcination temperature of 1000℃, so it cannot be used in the process of calcining rare earth carbonate into rare earth oxide. In addition, the temperature range in the traditional gas heating rotary kiln cannot be accurately controlled, which easily leads to local high temperature, not only resulting in low quality of calcined products, but also shortening the low temperature calcination time, leading to the discharge of chloride and sulfate in rare earth carbonate not meeting the standards. SUMMARY

[0005] The present application aims to overcome the shortcomings and deficiencies in the prior art, and provides a rotary kiln device. The rotary kiln device not only solves the problem that the traditional resistance heating rotary kiln cannot be used due to the calcination temperature of rare earth carbonate material being too low to reach the temperature of rare earth oxide, but also has precise temperature range control function, thereby improving the quality of the calcined products. The present application also provides a calcining method of the rotary kiln device, which can improve the quality of the calcined products and reduce the loss of heat energy.

[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: a rotary kiln device, comprising a rack, a furnace core cylinder, a material inlet device with a feeding port, a smoke settling chamber, a kiln head cover provided with a discharge port and a driving device; the furnace core cylinder is arranged on the rack and is arranged obliquely through the rack, and the two ends of the furnace core cylinder are rotatably connected with the smoke settling chamber and the kiln head cover respectively; the end of the furnace core cylinder connected with the smoke settling chamber is connected with the material inlet device; the driving device is connected with the furnace core cylinder to drive the rotation of the furnace core cylinder;

[0007] The furnace core cylinder is divided into a material preheating zone, a controllable temperature dechlorination and desulfurization zone, a controllable temperature carbonate decomposition zone and a wind distribution preheating zone along the material in-out direction; the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are respectively provided with an electromagnetic induction device; the material preheating zone, the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are respectively provided with a thermocouple for temperature monitoring.

[0008] The kiln head cover is provided with a wind distribution port, and the smoke sinking chamber is provided with a smoke exhaust port, so that the convection heat transfer in the furnace core cylinder is realized.

[0009] In the above scheme, the temperature of the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone can be adjusted by the electromagnetic induction device according to the monitoring temperature fed back by the thermocouple, so that the temperature can be accurately and timely controlled, and the problem that the traditional resistance heating rotary kiln cannot be used due to the failure to reach the temperature for calcining rare earth carbonate into rare earth oxide can be solved. In addition, the accurate temperature interval control function of the present application can provide sufficient time for dechlorination and desulfurization during the material calcination period, so that the problem of excessive chlorine and sulfate in the product caused by insufficient dechlorination and desulfurization due to rapid temperature rise can be avoided.

[0010] In addition, due to the flame heat transfer characteristics of the burner, the temperature in the cylinder of the traditional fuel-fired 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, but the traditional fuel-fired rotary kiln will cause more energy loss, and a higher firing maximum temperature will affect the properties of the product and affect the subsequent processing of the product. The rotary kiln device of the present application can more accurately control the temperature, which can solve the above problems of the traditional fuel-fired rotary kiln, can reduce the energy loss, and thus can improve the quality of the calcined product.

[0011] The smoke exhaust port is sequentially connected with a smoke exhaust regulating valve and a smoke exhaust stirring fan;

[0012] The smoke sinking chamber is provided with a pressure gauge for monitoring the pressure in the furnace core cylinder; the pressure gauge is connected with the smoke exhaust regulating valve and the smoke exhaust stirring fan through the controller, so that the frequency of the smoke exhaust stirring fan and / or the opening degree of the smoke exhaust regulating valve can be adjusted through the controller according to the monitored pressure data.

[0013] The rotary kiln device has a flue gas air distribution disturbance function, can enhance the gas movement in the inner cylinder of the furnace core, and promotes the emission of the dechlorination desulfurization and carbonate decomposition gas. Compared with the traditional fuel rotary kiln, the electromagnetic induction device is used for heating in the present application, which can reduce a large amount of flue gas emission and achieve energy saving effect. However, without the disturbance effect of the flue gas, the decomposition reaction of the rare earth carbonate and the dechlorination desulfurization will be inhibited, and the convection heat transfer effect in the inner cylinder of the furnace core is also reduced. The smoke exhaust port of the rotary kiln device is provided with a smoke exhaust stirring fan and a smoke exhaust regulating valve, the kiln head cover is provided with an air distribution port (to prevent dust raising), the smoke chamber is provided with a pressure gauge to monitor the pressure in the inner cylinder of the furnace core, and the frequency of the smoke exhaust stirring fan and / or the opening degree of the smoke exhaust regulating valve can be adjusted according to the feedback of the pressure gauge, so that the inner cylinder of the furnace core is in a slight negative pressure, which can avoid too much cold air entering the inner cylinder of the furnace core to cause energy consumption to increase. In addition, the cold air enters through the air distribution port, passes through the unheated air distribution preheating area, and the cold air exchanges heat with the material to promote the decomposition reaction and dechlorination desulfurization reaction of the material, and also can cool the calcined product, and can also increase the temperature of the flue gas flow, reduce the heating energy consumption of the controllable temperature dechlorination desulfurization zone and the controllable temperature carbonate decomposition zone.

[0014] The controllable temperature dechlorination desulfurization zone and the controllable temperature carbonate decomposition zone are provided with a heat insulation layer between the corresponding furnace core cylinder 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 heat damage to the electromagnetic induction device.

[0015] The furnace core cylinder is provided with a magnetically conductive metal lifting plate; the lifting plate is provided in the inner wall of the furnace core cylinder in a double helix structure.

[0016] The lifting plate located in the controllable temperature dechlorination desulfurization zone and the controllable temperature carbonate decomposition zone can be heated by the electromagnetic induction device to heat the flue gas flow and the material discharged from the smoke exhaust port.

[0017] The metal lifting plate of the present application can heat in the controllable temperature dechlorination desulfurization zone and the controllable temperature carbonate decomposition zone provided with the electromagnetic induction device, heat the flue gas flow and the material, and also has the effect of spiral disturbance wind guide, so as to increase the heat exchange effect of the material in the furnace core cylinder, and also has the effect of stirring the material to promote calcination.

[0018] A plurality of partitions are arranged in the radial direction in the inner cylinder of the furnace core, and a material outlet hole is arranged on each partition; a plurality of magnetically conductive steel balls are arranged between adjacent partitions, and the steel balls roll between adjacent partitions when the furnace core cylinder rotates.

[0019] The steel balls located in the controllable temperature dechlorination desulfurization zone and the controllable temperature carbonate decomposition zone can be heated by the electromagnetic induction device to increase the contact area of the material heating and stir the material to promote the calcination of the material.

[0020] The inclination angle of the furnace core cylinder arranged in the material in-out direction is 0.5°-2°; when the furnace core cylinder rotates, the stacking height of the steel balls is less than half of the height of the partition plate.

[0021] The furnace core cylinder of the rotary kiln device is internally provided with steel balls with magnetic permeability, and in the rotating process of the rotary kiln device, the material is dynamically calcined, 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 gathering during the calcination process, thereby causing insufficient calcination, and can also slow down the material sticking to the wall. The furnace core cylinder is internally provided with a plurality of partition plates, which can allow the material to pass through and block the steel balls, so that the steel balls do not carry away the energy consumption during the calcination of the material. In the rotating process of the rotary kiln device, 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 cylinder rotates at a slow speed, and the stacking height of the steel balls is generally less than half of the height of the partition plate.

[0022] A calcination method of a rotary kiln device, which adopts the above rotary kiln device, the calcination method comprising: driving the furnace core cylinder to rotate by the driving device, the material enters the furnace core cylinder arranged in an inclination and is sequentially subjected to calcination in a material preheating zone, a controllable temperature dechlorination and desulfurization zone, a controllable temperature carbonate decomposition zone and a wind distribution preheating zone, and the calcined product is discharged from the discharge port of the kiln head cover;

[0023] In the material calcination process, a thermocouple is used to monitor the temperature of the material preheating zone, the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone, and the inductive electric power of the electromagnetic induction device is adjusted according to the temperature feedback monitored by the thermocouple, so as to realize accurate temperature control of the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone.

[0024] The smoke exhaust port is provided with a smoke exhaust and stirring fan, the flue gas generated in the material calcination is discharged from the smoke exhaust port, the external air entering from the air distribution port exchanges heat with the material, so as to promote the decomposition reaction and dechlorination and desulfurization reaction of the material, cool the calcined product, and increase the temperature of the flue gas flow to reduce the heating energy consumption of the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone.

[0025] A metal lifting plate with magnetic permeability with a double helix structure is arranged on the inner wall of the furnace core cylinder; the lifting plate in the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone is heated by the electromagnetic induction device, so as to disturb the airflow of the furnace core cylinder to increase the heat exchange effect of the material, stir the material, and heat the flue gas flow and the material, thereby promoting the calcination of the material;

[0026] The furnace core cylinder is segmented and placed with several magnetically conductive steel balls in a way of being separated by partitions, and the steel balls in the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are heated through electromagnetic induction devices; when the furnace core cylinder rotates, the materials pass through the partitions, and the heated steel balls rolling between adjacent partitions heat, stir and grind the materials, so that the calcination of the materials is promoted; at this time, the stacking height of the steel balls is less than half of the height of the partition.

[0027] The rotary kiln equipment has the following advantages:

[0028] 1. Compared with the traditional gas-fired rotary kiln, the present application has more accurate setting of the firing period and firing temperature, and improves the quality of the calcined product. 2. Compared with the traditional resistance heating rotary kiln, the present application has the function of airflow stirring, which enhances the convective heat transfer and promotes the emission of flue gas, and at the same time, promotes the decomposition reaction and dechlorination and desulfurization reaction of the materials, cools the calcined product, and increases the temperature of the flue gas to reduce the heating energy consumption of the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone.

[0029] 4. The furnace core cylinder has heatable steel balls, which increase the heating area of the materials and also have the functions of stirring and grinding the materials.

[0030] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0031] 1. The rotary kiln equipment of the present application not only solves the problem that the traditional resistance heating rotary kiln cannot reach the temperature of calcining rare earth carbonate into rare earth oxide, but also has the function of precise temperature interval control, thereby improving the quality of the calcined product.

[0032] 2. The calcination method of the rotary kiln equipment of the present application can improve the quality of the calcined product and reduce the loss of heat energy. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of the rotary kiln equipment of the present application;

[0034] Figure 2 is a schematic diagram of the furnace core cylinder of the rotary kiln equipment of the present application;

[0035] Among them, 1 is the frame, 2 is the furnace core cylinder, 3 is the feed port, 4 is the material inlet device, 5 is the smoke settling chamber, 6 is the discharge port, 7 is the kiln head cover, 8 is the driving device, 9 is the material preheating zone, 10 is the temperature-controlled dechlorination and desulfurization zone, 11 is the temperature-controlled carbonate decomposition zone, 12 is the air distribution preheating zone, 13 is the electromagnetic induction coil, 14 is the thermocouple, 15 is the air distribution port, 16 is the smoke exhaust port, 17 is the smoke exhaust regulating valve, 18 is the smoke exhaust stirring fan, 19 is the pressure gauge, 20 is the thermal insulation layer, 21 is the lifting plate, 22 is the partition, 22.1 is the discharge hole, and 23 is the air hammer. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example

[0038] like Figure 1 and Figure 2 As shown, the rotary kiln equipment of the present invention includes a frame 1, a furnace core barrel 2, a material inlet device 4 with a material feed port 3, a smoke settling chamber 5, a kiln head hood 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, and the two ends of the furnace core barrel 2 are rotatably connected to the smoke settling chamber 5 and the kiln head hood 7 respectively, and the end of the furnace core barrel 2 connected to the smoke settling chamber 5 is connected to the material inlet device 4, and 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 hood 7 and making it difficult to discharge, the present invention provides an air hammer 23 on the upper part of the discharge port 6. The external compressed air activates the air hammer 23 to achieve vibration of the outer wall of the kiln head hood 7 above the discharge port 6, so that the calcined product can be discharged smoothly.

[0039] The furnace core barrel 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 directions. The furnace core barrel 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 convective heat transfer within the furnace core barrel 2, the kiln head hood 7 is provided with an air distribution port 15, and the smoke chamber 5 is provided with a smoke exhaust port 16.

[0040] The smoke outlet 16 of the present invention is sequentially connected 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. This pressure gauge 19 is connected to the smoke exhaust regulating valve 17 and the smoke exhaust stirring fan 18 via a controller, enabling the controller to adjust the frequency of the smoke exhaust stirring fan 18 and / or the opening of the smoke exhaust regulating valve 17 based on the monitored pressure data.

[0041] The temperature-controllable dechlorination and desulfurization zone 10 and the temperature-controllable carbonate decomposition zone 11 of the present application are provided with a heat insulation layer 20 between the corresponding furnace core barrel 2 and the electromagnetic induction coil 13. 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.

[0042] The furnace core barrel 2 is provided with a metal lifting plate 21 with magnetic conductivity, which is arranged on the inner wall of the furnace core barrel 2 in a double helix structure. The lifting plate 21 in the temperature-controllable dechlorination and desulfurization zone 10 and the temperature-controllable carbonate decomposition zone 11 can be heated by the electromagnetic induction coil 13 to heat the exhaust gas stream and the material discharged from the exhaust port 16. The metal lifting plate 21 of the present application can heat the exhaust gas stream and the material in the temperature-controllable dechlorination and desulfurization zone 10 and the temperature-controllable carbonate decomposition zone 11 provided with the electromagnetic induction coil 13, and also has the effect of spiral disturbance wind guide, thus increasing the heat exchange effect of the material in the furnace core barrel 2, and also has the effect of stirring the material to promote calcination.

[0043] The furnace core barrel 2 is provided with a plurality of partitions 22 in the radial direction, and each partition 22 is provided with a discharge hole 22.1 for the material to pass through; a plurality of steel balls with magnetic conductivity (not shown) are placed between adjacent partitions 22, and the steel balls roll between the adjacent partitions 22 when the furnace core barrel 2 rotates. The steel balls in the temperature-controllable dechlorination and desulfurization zone 10 and the temperature-controllable carbonate decomposition zone 11 can be heated by the electromagnetic induction coil 13 to increase the contact area of the material heating and stir the material to promote calcination. In addition, the furnace core barrel 2 is inclined along the direction of material entering and leaving, and the inclination angle is 0.5°~2°, and the stacking height of the steel balls is less than half the height of the partition 22 when the furnace core barrel 2 rotates.

[0044] The furnace core barrel 2 of the present application is provided with steel balls with magnetic conductivity, and the material is dynamically calcined during the rotation of the rotary kiln equipment, and the heated steel balls can increase the contact area of the material heating and stir the material, thereby promoting the calcination of the material. In addition, the steel balls can also grind the material to prevent the material from agglomerating during calcination, which can cause insufficient calcination, and also slow down the material sticking to the wall. The furnace core barrel 2 of the present application is provided with a plurality of partitions 22, which can block the material and the steel balls, so that the steel balls do not take away the energy consumption during the calcination of the material. During the rotation of the rotary kiln equipment, the rotary kiln has an inclination angle of only 0.5°~2°, so the steel balls will not slide down and stack when the furnace core barrel 2 rotates at a slow speed, and the stacking height of the steel balls is generally less than half the height of the partition 22.

[0045] The calcination method of the rotary kiln device is as follows: the driving device 8 drives the rotation of the furnace core barrel 2, the material enters the furnace core barrel 2 arranged in an inclined manner and is sequentially subjected to calcination in the material preheating zone 9, the controllable temperature dechlorination and desulfurization zone 10, the controllable temperature carbonate decomposition zone 11 and the air distribution preheating zone 12, and the calcined product is discharged from the discharge port 6 of the kiln head cover 7;

[0046] During the calcination of the material, the thermocouple 14 is used to monitor the temperature of the material preheating zone 9, the controllable temperature dechlorination and desulfurization zone 10 and the controllable temperature carbonate decomposition zone 11, and the inductive 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 realize the accurate control of the temperature of the controllable temperature dechlorination and desulfurization zone 10 and the controllable temperature carbonate decomposition zone 11.

[0047] The smoke exhaust port 16 is provided with a smoke stirring fan 18, the flue gas generated during 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, so as to promote the decomposition reaction and the dechlorination and desulfurization reaction of the material, cool the calcined product, and increase the temperature of the flue gas flow to reduce the heating energy consumption of the controllable temperature dechlorination and desulfurization zone 10 and the controllable temperature carbonate decomposition zone 11.

[0048] The inner wall of the furnace core barrel 2 is provided with a metal stir plate 21 with a double helix structure and magnetic conductivity; the stir plate 21 located in the controllable temperature dechlorination and desulfurization zone 10 and the controllable temperature carbonate decomposition zone 11 is heated by the electromagnetic induction coil 13, so as to disturb the airflow of the furnace core barrel 2 to increase the heat exchange effect of the material, stir the material, heat the flue gas flow and the material, and promote the calcination of the material.

[0049] A plurality of steel balls with magnetic conductivity are placed in the furnace core barrel 2 in a segmented manner separated by the partition plates 22, and the steel balls located in the controllable temperature dechlorination and desulfurization zone 10 and the controllable temperature carbonate decomposition zone 11 are heated by the electromagnetic induction coil 13; when the furnace core barrel 2 rotates, the material passes through the partition plates 22 and is heated, stirred and ground by the heated steel balls rolling between adjacent partition plates 22, so as to promote the calcination of the material; at this time, the stacking height of the steel balls is less than half of the height of the partition plates 22.

[0050] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principles of the present application shall be equivalent replacement modes and shall be included in the protection scope of the present application.

Claims

1. A rotary kiln apparatus, characterized by: The kiln comprises a rack, a furnace core cylinder, a material inlet device with a feeding port, a smoke sink, a kiln head cover provided with a discharging port and a driving device; the furnace core cylinder is arranged on the rack and is arranged obliquely through the rack, and two ends of the furnace core cylinder are rotatably connected with the smoke sink and the kiln head cover respectively; the end of the furnace core cylinder connected with the smoke sink is connected with the material inlet device; the driving device is connected with the furnace core cylinder to drive the furnace core cylinder to rotate; The furnace core cylinder is divided into a material preheating zone, a controllable temperature dechlorination and desulfurization zone, a controllable temperature carbonate decomposition zone and a wind distribution preheating zone along the material inlet and outlet direction; the furnace core cylinders corresponding to the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are respectively provided with electromagnetic induction devices; the material preheating zone, the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone are respectively provided with thermocouples for temperature monitoring; The kiln head cover is provided with a wind distribution port, and the smoke sink is provided with a smoke exhaust port to realize the convection heat transfer in the furnace core cylinder; the smoke exhaust port is sequentially connected with a smoke exhaust regulating valve and a smoke exhaust stirring fan; the smoke sink is provided with a pressure gauge for monitoring the pressure in the furnace core cylinder; the pressure gauge is connected with the smoke exhaust regulating valve and the smoke exhaust stirring fan through a controller to adjust the frequency of the smoke exhaust stirring fan and / or the opening degree of the smoke exhaust regulating valve according to the monitored pressure data; The furnace core cylinder is internally provided with a metal lifting plate with magnetic conductivity; the lifting plate is arranged on the inner wall of the furnace core cylinder in a double helix structure; The furnace core cylinder is internally provided with a plurality of partitions along the radial direction, and each partition is provided with a discharging hole through which the material passes; a plurality of steel balls with magnetic conductivity are arranged between adjacent partitions, and the steel balls roll between the adjacent partitions when the furnace core cylinder rotates; The furnace core cylinder is arranged obliquely along the material inlet and outlet direction at an inclination angle of 0.5° to 2°; when the furnace core cylinder rotates, the stacking height of the steel balls is less than half the height of the partition; An air hammer is arranged on the upper part of the discharging port, and the external compressed air starts the air hammer to vibrate the outer wall of the kiln head cover on the upper part of the discharging port, so that the calcined product is smoothly discharged; The lifting plate located in the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone can be heated through the electromagnetic induction device to heat the exhaust smoke flow and the material discharged from the smoke exhaust port; The steel balls located in the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone can be heated through the electromagnetic induction device to increase the contact area of the material heating and stir the material to promote the calcination of the material.

2. The rotary kiln apparatus of claim 1, wherein: A heat insulation layer is arranged between the furnace core cylinder corresponding to the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone and the electromagnetic induction device.

3. A calcination method of a rotary kiln apparatus using the rotary kiln apparatus according to claim 1 or 2, characterized by: The calcination method is as follows: the driving device drives the furnace core cylinder to rotate, the material enters the obliquely arranged furnace core cylinder and is sequentially subjected to calcination in the material preheating zone, the controllable temperature dechlorination and desulfurization zone, the controllable temperature carbonate decomposition zone and the wind distribution preheating zone, and the calcined product is discharged from the discharging port of the kiln head cover; During the calcination of the material, the thermocouples are used to monitor the temperatures of the material preheating zone, the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone, and the inductive electric power of the electromagnetic induction device is adjusted according to the temperature monitored and fed back by the thermocouples to realize the accurate control of the temperatures of the controllable temperature dechlorination and desulfurization zone and the controllable temperature carbonate decomposition zone. The smoke outlet is provided with a smoke exhaust fan, and the smoke generated by the calcination of the material is discharged from the smoke outlet; the external air entering from the air distribution port exchanges heat with the material, promotes the decomposition reaction and the dechlorination and desulfurization reaction of the material, cools the calcined product, and increases the temperature of the smoke flow to reduce the heating energy consumption of the controllable temperature dechlorination and desulfurization area and the controllable temperature carbonate decomposition area; The inner wall of the furnace core cylinder is provided with a metal lifting plate with a double-helix magnetic structure; the lifting plate in the controllable temperature dechlorination and desulfurization area and the controllable temperature carbonate decomposition area is heated by the electromagnetic induction device to heat the airflow in the furnace core cylinder to increase the heat exchange effect of the material, stir the material, and heat the smoke flow and the material to promote the calcination of the material; A plurality of magnetic steel balls are placed in the furnace core cylinder in a segmented manner separated by partitions, and the steel balls in the controllable temperature dechlorination and desulfurization area and the controllable temperature carbonate decomposition area are heated by the electromagnetic induction device; when the furnace core cylinder rotates, the material passes through the partitions and is heated, stirred, and ground by the heated steel balls rolling between adjacent partitions to promote 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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