A zirconium powder raw material calcination pre-drying device
By employing a graded drying structure and high-temperature countercurrent contact technology in the zircon powder calcination pre-drying equipment, the problems of wet material accumulation and uneven airflow in traditional drying towers have been solved, achieving uniform drying and efficient calcination of zircon powder.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU ZHUYOU ZIRCONIUM TITANIUM TECH CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-21
Smart Images
Figure CN224534719U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of calcination pretreatment equipment, and in particular to a calcination pre-drying equipment for zircon powder raw materials. Background Technology
[0002] Zircon powder, as an important inorganic non-metallic material, has irreplaceable application value in precision casting, refractory materials, and ceramic glazes due to its high melting point, low coefficient of thermal expansion, and excellent chemical stability. In precision casting processes, zircon powder usually requires high-temperature calcination to improve its refractoriness and slag erosion resistance. Pre-treatment before calcination is a key step in determining the quality of the final product, mainly including three processes: crushing, screening, and drying. Crushing involves pulverizing large pieces of zircon raw material into fine powder; screening uses a vibrating screen or air classifier to remove ultra-coarse particles, ensuring that the particle size distribution meets the requirements of the calcination process; and drying aims to remove adsorbed moisture from the raw material to prevent abrupt changes in lattice stress caused by rapid evaporation of moisture during calcination, which could lead to cracks or pores.
[0003] In related technologies, traditional single-chamber drying towers use uniformly distributed guide plates, which cannot meet the needs of different drying stages of zircon powder. In the early stage, wet material is prone to accumulating and sticking to the wall due to the excessively dense guide plates. In the later stage, semi-dry powder has a moisture content gradient due to uneven airflow distribution, which affects the uniformity of subsequent calcination and crystallization. Therefore, it needs to be improved. Utility Model Content
[0004] To address the problem that drying equipment cannot adapt to the needs of the drying stage, this application provides a calcination pre-drying device for zircon powder raw materials.
[0005] The zircon powder raw material calcination and pre-drying equipment provided in this application adopts the following technical solution:
[0006] A zircon powder raw material calcination pre-drying device includes a vertical tower body. The interior of the vertical tower body is divided into a primary drying chamber and a secondary drying chamber from top to bottom. A conical shrinkage transition section connects the primary drying chamber and the secondary drying chamber. A feed hopper is provided at the top of the vertical tower body, and a discharge port is provided at the bottom of the vertical tower body. Several guide plates are respectively provided in the primary drying chamber and the secondary drying chamber. The distribution density of the guide plates in the secondary drying chamber is greater than that in the primary drying chamber. A hot air supply mechanism and a return material mechanism are provided on the vertical tower body.
[0007] Traditional single-chamber drying towers, which use uniformly distributed guide plates, cannot meet the needs of different drying stages of zircon powder. In the initial stage, wet material tends to accumulate and stick to the walls due to the excessively dense guide plates. In the later stage, semi-dry powder suffers from a moisture content gradient due to uneven airflow distribution, affecting the uniformity of subsequent calcination and crystallization. By adopting the above-mentioned technical solution, including a vertical tower body, a primary drying chamber and a secondary drying chamber are formed inside the vertical tower body. The primary and secondary drying chambers are connected by a conical contraction transition section. Guide plates are installed in the primary and secondary drying chambers. The distribution density of guide plates in the secondary drying chamber is greater than that in the primary drying chamber. Furthermore, the hot air supply mechanism and the return material mechanism are installed on the vertical tower body.
[0008] During the pretreatment and drying of raw materials, zircon powder is fed into the vertical tower through the top feed hopper. It first enters the primary drying chamber, where the guide plates have a lower distribution density. The raw material falls naturally under gravity, and the guide plates guide it to disperse into a thin layer, increasing the contact area with hot air and achieving initial drying. After passing through a conical contraction transition section into the secondary drying chamber, it encounters guide plates with a higher distribution density, forming a longer falling path and more opportunities for contact with hot air. The hot air supply mechanism then delivers high-temperature air into the tower. The hot air flows upward in the primary drying chamber, passing through densely distributed guide plates (the secondary guide plates have an even higher density), and forms a countercurrent contact with the falling raw material, enhancing the heat and mass transfer efficiency. The hot air continues to rise to the primary drying chamber and is finally discharged through the heat dissipation vent (top of the primary chamber), carrying away the moisture. The dried raw material is discharged from the bottom outlet of the tower. If it may still contain a small amount of unqualified moisture, the return material mechanism is activated to transport the unqualified raw material from the outlet to the top feed hopper. The raw material forms a closed-loop circulation inside and outside the tower. After confirming that the moisture content meets the standard, qualified raw material is finally discharged.
[0009] By incorporating a vertical tower structure, a primary drying chamber, a secondary drying chamber, and a hot air supply mechanism, this system effectively solves the problems of wet material accumulation and wall adhesion, as well as uneven drying, inherent in traditional single-chamber drying towers. The primary drying chamber uses low-density inverted V-shaped guide plates to guide the wet material to naturally disperse into a thin layer and complete preliminary surface drying, avoiding the risk of wet material sticking to the walls due to overly dense guide plates. The secondary drying chamber extends the material's falling path through high-density guide plates, combined with high-temperature hot air counter-current penetration contact, deeply evaporating internal bound water and eliminating moisture content differences caused by uneven airflow. The conical contraction transition section not only accelerates material flow but also prevents hot air short-circuiting, significantly improving thermal efficiency. Simultaneously, the return material mechanism automatically circulates and dries substandard raw materials, ensuring the uniformity of moisture content in the final product and providing a stable raw material guarantee for subsequent calcination processes.
[0010] Optionally, any of the guide plates has an inverted V-shaped structure, and slots for installing the guide plates are provided in the primary drying chamber and the secondary drying chamber.
[0011] By adopting the above technical solution, each guide plate has an inverted V-shaped structure. Through the setting of the guide plate shape, the inverted V-shaped guide plate forms a double-sided sloping structure, which uses its ridge line to guide the raw material to naturally disperse and slide down the sloping surface, avoiding the material accumulation problem that is easily caused by flat guide plates. On the other hand, the inverted V-shaped structure is installed by slot embedding, which ensures the installation stability of the guide plate and the inner wall of the tower.
[0012] Optionally, the hot air supply mechanism includes several hot air fans, and the vertical tower body is provided with a hot air inlet and a heat dissipation outlet. The hot air inlet is located on the side wall of the secondary drying chamber, and the heat dissipation outlet is located on the top of the primary drying chamber. The air outlets of the several hot air fans are connected to the hot air inlet.
[0013] By adopting the above technical solution, the hot air supply mechanism includes several hot air fans, and the vertical tower body is provided with hot air inlets and heat dissipation outlets. Through the arrangement of the hot air fans, the efficient utilization of heat energy is realized. The hot air fans are concentrated at the hot air inlets on the side wall of the secondary drying chamber, so that high-temperature air enters evenly from the bottom of the secondary stage and flows upward, forming a gradient temperature field of "secondary high-temperature deep drying - primary low-temperature pre-drying", which enhances the heat and mass transfer efficiency.
[0014] Optionally, the vertical tower body is provided with an extended hot air cavity for communication with the hot air inlet.
[0015] By adopting the above technical solution, the extended hot air cavity is formed on the vertical tower body, and the hot air inlet of the extended hot air cavity is connected. By setting the extended hot air cavity, the extended hot air cavity increases the contact area between the hot air and the tower wall, and recovers part of the heat by utilizing the thermal conductivity of the metal wall of the tower body, thereby reducing the loss of heat energy to the external environment and improving the heat utilization rate.
[0016] Optionally, each of the hot air blowers is provided with a blower support for installation, the blower support is connected to the outer wall of the vertical tower body, and the bottom of the blower support is provided with a diagonal brace.
[0017] By adopting the above technical solution, the hot air fan is installed on the outside of the vertical tower body through the fan support. The bottom of the fan support is welded with diagonal bracing rods, and the fan support is fixed to the outer wall of the tower body in a rigid connection manner. The addition of diagonal bracing rods at the bottom forms a triangular stable structure, which effectively disperses the vibration and torque generated when the fan is running, avoids the loosening of the support or fatigue cracking of the tower body connection parts due to long-term vibration, and extends the service life of the equipment.
[0018] Optionally, the return material mechanism includes a screw extruder, a return material drying pipe, and a negative pressure conveyor. The input end of the screw extruder is connected to the discharge port of the vertical tower body, and the two ends of the return material drying pipe are respectively connected to the output end of the screw extruder and the feed hopper. The negative pressure conveyor is connected inside the return material drying pipe.
[0019] By adopting the above technical solution, the return material mechanism includes a screw extruder, a return material drying pipe, and a negative pressure conveyor. Through the setting of the return material mechanism, the automatic closed-loop circulation drying of substandard raw materials is realized. This not only avoids the efficiency loss caused by the need for manual return of materials when the traditional equipment needs to be stopped, but also significantly improves the drying uniformity and product qualification rate by supplementing the drying of the circulating raw materials through the secondary heat treatment function of the return material drying pipe.
[0020] Optionally, the screw extruder includes a cylinder, a variable pitch screw, and a servo motor. The cylinder is connected between the discharge port of the vertical tower and the return drying pipe. The variable pitch screw is rotatably connected inside the cylinder, and the output end of the servo motor is connected to the end of the variable pitch screw.
[0021] By adopting the above technical solution, the screw extruder includes a cylinder, a variable pitch screw, and a servo motor. Through the setting of the screw extruder, the return process of substandard raw materials is realized. The cylinder serves as the hub connecting the discharge port of the vertical tower and the return drying pipe, constructing a closed conveying channel for substandard raw materials. This effectively avoids the dust leakage and heat loss problems that are easily caused by traditional open return processes, and achieves stable transmission of raw materials.
[0022] Optionally, the wall of the return drying tube is equipped with an infrared moisture monitor.
[0023] By adopting the above technical solution, an infrared moisture monitor is installed on the wall of the return drying tube; the setting of the infrared moisture monitor enables real-time monitoring of the moisture content of the raw materials during the return process, ensuring the overall drying quality.
[0024] In summary, this application includes at least one of the following beneficial technical effects:
[0025] 1. By incorporating a vertical tower body, a primary drying chamber, a secondary drying chamber, and a hot air supply mechanism, this system effectively solves the problems of wet material accumulation and wall adhesion, as well as uneven drying, that exist in traditional single-chamber drying towers. The primary drying chamber uses low-density inverted V-shaped guide plates to guide the wet material to naturally disperse into a thin layer and complete preliminary surface drying, avoiding the risk of wet material sticking to the wall due to excessively dense guide plates. The secondary drying chamber extends the material's falling path through high-density guide plates, combined with high-temperature hot air counter-current penetration contact, deeply evaporating the internal bound water and eliminating moisture content differences caused by uneven airflow. The conical contraction transition section not only accelerates the material flow but also prevents hot air short-circuiting, significantly improving thermal efficiency. At the same time, the return material mechanism automatically circulates and dries substandard raw materials, ensuring the uniformity of moisture content in the final product and providing a stable raw material guarantee for subsequent calcination processes.
[0026] 2. By setting up the hot air blower, the efficient utilization of heat energy is achieved. The hot air blower is centrally arranged at the hot air inlet on the side wall of the secondary drying chamber, so that the high temperature air enters evenly from the bottom of the secondary stage and flows upward, forming a gradient temperature field of "secondary high temperature deep drying - primary low temperature pre-drying", which enhances the heat and mass transfer efficiency.
[0027] 3. By setting up a return material mechanism, automatic closed-loop circulation drying of substandard raw materials is realized. This not only avoids the efficiency loss caused by the need for manual return of materials when the traditional equipment needs to be stopped, but also supplements the drying of circulating raw materials through the secondary heat treatment function of the return material drying tube, which significantly improves the drying uniformity and product qualification rate. Attached Figure Description
[0028] Figure 1 This is a front view of a zircon powder raw material calcination and pre-drying device according to an embodiment of this application.
[0029] Figure 2 This is a cross-sectional view of the internal structure of the vertical tower body in the embodiment of this application.
[0030] Figure 3 This is a side view of a zircon powder raw material calcination and pre-drying device in the application embodiment.
[0031] Explanation of reference numerals in the attached drawings: 1. Vertical tower body; 2. Primary drying chamber; 3. Secondary drying chamber; 4. Conical shrinkage transition section; 5. Feed hopper; 6. Discharge port; 7. Guide plate; 8. Hot air supply mechanism; 81. Hot air fan; 9. Return material mechanism; 91. Screw extruder; 911. Cylinder; 912. Variable pitch screw; 913. Servo motor; 92. Return material drying pipe; 93. Negative pressure conveyor; 10. Hot air inlet; 11. Heat dissipation vent; 12. Expanded hot air chamber; 13. Fan support; 14. Diagonal brace; 15. Infrared moisture monitor. Detailed Implementation
[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0033] This application discloses a calcination and pre-drying device for zircon powder raw materials. (Refer to...) Figure 1 and Figure 2 The zircon powder raw material calcination and pre-drying equipment includes a vertical tower body 1. The interior of the vertical tower body 1 is divided into a primary drying chamber 2 and a secondary drying chamber 3 from top to bottom. At the same time, a conical shrinkage transition section 4 connects the primary drying chamber 2 and the secondary drying chamber 3.
[0034] Reference Figure 1 and Figure 2Several guide plates 7 are installed in the primary drying chamber 2 and the secondary drying chamber 3 respectively. The distribution density of guide plates 7 in the secondary drying chamber 3 is greater than that in the primary drying chamber 2. Each guide plate 7 has an inverted V-shaped structure. The primary drying chamber 2 and the secondary drying chamber 3 have slots for installing the guide plates 7. The inverted V-shaped guide plates 7 form a double-sided sloping structure. The ridges of the guide plates guide the raw materials to naturally disperse and slide down the sloping surface, avoiding the material accumulation problem that is easily caused by flat guide plates 7. On the other hand, the inverted V-shaped structure is installed by embedding in the slots, which ensures the installation stability of the guide plates 7 and the inner wall of the tower.
[0035] Reference Figure 1 and Figure 3 The vertical tower body 1 is equipped with a feed hopper 5 at the top and a discharge port 6 at the bottom. A hot air supply mechanism 8 is installed on the vertical tower body 1. In this embodiment, zircon powder raw material is fed into the vertical tower body 1 through the feed hopper 5. It first enters the primary drying chamber 2. The guide plate 7 in the primary drying chamber 2 guides the raw material to disperse and achieves preliminary drying. After entering the secondary drying chamber 3 through the conical shrinkage transition section 4, it encounters the guide plate 7 and forms a longer falling path and more opportunities to contact with hot air. The dried raw material is discharged from the discharge port 6 at the bottom of the tower body.
[0036] Reference Figure 1 and Figure 3 The hot air supply mechanism 8 includes several hot air fans 81, preferably two sets of hot air fans 81. The vertical tower body 1 is provided with a hot air inlet 10 and a heat dissipation outlet 11. The hot air inlet 10 is located on the side wall of the secondary drying chamber 3, and the heat dissipation outlet 11 is located on the top of the primary drying chamber 2. In this embodiment, the heat dissipation outlet 11 is equipped with a corresponding valve plate, which can be closed when not in use. At the same time, the vertical tower body 1 is provided with an extended hot air chamber 12 for communicating with the hot air inlet 10. The air outlets of several hot air fans 81 are connected to the hot air inlet 10 through the extended hot air chamber 12. This achieves efficient utilization of heat energy. The hot air fans 81 are concentrated at the hot air inlet 10 on the side wall of the secondary drying chamber 3, so that high-temperature air enters evenly from the bottom of the secondary stage and flows upward, forming a gradient temperature field of "secondary high-temperature deep drying - primary low-temperature pre-drying", which enhances the heat and mass transfer efficiency.
[0037] Reference Figure 1 and Figure 3Each hot air blower 81 is equipped with a blower support 13 at its bottom. The blower support 13 is fixed to the outer wall of the vertical tower body 1. At the same time, a diagonal brace 14 is welded to the bottom of the blower support 13. One end of the diagonal brace 14 is connected to the bottom of the blower support 13, and the other end of the diagonal brace 14 is connected to the outer wall of the vertical tower body 1. The blower support 13 is fixed to the outer wall of the tower body in a rigid connection manner. The addition of the diagonal brace 14 at the bottom forms a triangular stable structure, which effectively disperses the vibration and torque generated when the blower is running, avoids the loosening of the support or fatigue cracking of the tower body connection parts due to long-term vibration, and extends the service life of the equipment.
[0038] Reference Figure 1 and Figure 3 The vertical tower body 1 is also equipped with a return material mechanism 9, which includes a screw extruder 91, a return material drying pipe 92, and a negative pressure conveyor 93. The screw extruder 91 includes a cylinder 911, a variable pitch screw 912, and a servo motor 913. The cylinder 911 is connected between the outlet 6 of the vertical tower body 1 and the return material drying pipe 92. The variable pitch screw 912 is rotatably connected to the cylinder 911 through bearings. The variable pitch screw is arranged along the length of the cylinder 911. In this embodiment, the outlet 6 of the vertical tower body 1 and the return material drying pipe 92 are respectively... The two ports along the length of the cylinder 911 are connected. The servo motor 913 is installed outside the cylinder 911. The output end of the servo motor 913 passes into the cylinder 911 and is connected to the end of the variable pitch screw 912. The screw extruder 91 realizes the return of substandard raw materials. The cylinder 911 serves as the hub connecting the discharge port 6 of the vertical tower 1 and the return drying pipe 92, constructing a closed conveying channel for substandard raw materials. This effectively avoids the dust leakage and heat loss problems that are easily caused by traditional open return, and realizes the stable transmission of raw materials.
[0039] Reference Figure 2The return material drying pipe 92 is vertically installed on one side of the vertical tower body 1. One end of the return material drying pipe 92 is connected to the cylinder 911 of the screw extruder 91, and the other end is connected to the feed hopper 5. The negative pressure conveyor 93 is connected inside the return material drying pipe 92. The negative pressure conveyor 93 can be a vacuum conveyor or a Venturi tube conveyor. It generates negative pressure inside the pipe through a fan, sucking in the raw material and conveying it to the feed hopper, realizing low-energy consumption and dust-free closed-loop material conveying. In this embodiment, the outlet of the return material drying pipe 92 and the cylinder 911 of the screw extruder 91 are detachable. After the raw material is dried... The material can be discharged through the outlet of the screw extruder 91 cylinder 911, or through the discharge port 6 at the bottom of the vertical tower 1, or through the feed hopper 5 at the top of the return drying pipe 92. The feed hopper 5 can be equipped with a corresponding outlet so that the raw material can be discharged directly without entering the vertical tower 1, realizing multiple discharge methods. The return mechanism 9 realizes the automatic closed-loop circulation drying of substandard raw materials, which not only avoids the efficiency loss of traditional equipment that requires shutdown and manual return, but also supplements the drying of circulating raw materials through the secondary heat treatment function of the return drying pipe 92, significantly improving the drying uniformity and product qualification rate.
[0040] Reference Figure 2 An infrared moisture monitor 15 is installed on the wall of the return drying tube 92, which enables real-time monitoring of the moisture content of the raw materials during the return process and ensures the overall drying quality.
[0041] The implementation principle of the zircon powder calcination pre-drying equipment in this application embodiment is as follows: When the raw material is pre-treated and dried, the zircon powder raw material is fed into the vertical tower body 1 through the top feed hopper 5. It first enters the primary drying chamber 2. The distribution density of the guide plates 7 in the primary drying chamber 2 is relatively low. The raw material falls naturally under the action of gravity. The guide plates 7 guide the raw material to disperse into a thin layer, increasing the contact area with hot air and achieving preliminary drying. After entering the secondary drying chamber 3 through the conical shrinkage transition section 4, it encounters the guide plates 7 with a higher distribution density, forming a longer falling path and more opportunities to contact with hot air. The hot air fan 81 sends high-temperature air into the tower body from the hot air inlet 10 (located on the side wall of the secondary drying chamber 3) through the extended hot air chamber 12. The hot air rises in the secondary drying chamber 3. The hot air flows through the densely distributed guide plates 7 (the secondary guide plates 7 have a higher density) and forms a countercurrent contact with the falling raw material, enhancing the heat and mass transfer efficiency. The hot air continues to rise to the primary drying chamber 2 and is finally discharged through the heat dissipation port 11 (top of the primary chamber), carrying away the moisture. The dried raw material is discharged from the bottom outlet 6 of the tower. At this time, it may still contain a small amount of unqualified moisture. The infrared moisture monitor 15 detects the moisture content of the raw material in real time and starts the return circulation. The screw extruder 91 (including the variable pitch screw 912) transports the unqualified raw material from the outlet 6 to the return drying pipe 92. The negative pressure conveyor 93 forms a negative pressure in the return drying pipe 92, accelerating the return of the raw material to the top feed hopper 5. The raw material forms a closed-loop circulation inside and outside the tower until the moisture content is confirmed to be up to standard, and finally qualified raw material is discharged.
[0042] By incorporating a vertical tower body 1, a primary drying chamber 2, a secondary drying chamber 3, and a hot air supply mechanism 8, the system effectively solves the problems of wet material accumulation and wall adhesion, as well as uneven drying, that exist in traditional single-chamber drying towers. The primary drying chamber 2 uses low-density inverted V-shaped guide plates 7 to guide the wet material to naturally disperse into a thin layer and complete the initial surface drying, avoiding the risk of wet material sticking to the wall due to excessive density of the guide plates 7. The secondary drying chamber 3 extends the falling path of the raw material through high-density guide plates 7, combined with high-temperature hot air counter-current penetration contact, deeply evaporating the internal bound water and eliminating the difference in moisture content caused by uneven airflow. The conical contraction transition section 4 not only accelerates the flow of raw materials but also prevents hot air short-circuiting, significantly improving thermal efficiency. At the same time, the return material mechanism 9 automatically circulates and dries the substandard raw materials, ensuring the uniformity of moisture content in the final product and providing a stable raw material guarantee for subsequent calcination processes.
[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A calcination and pre-drying device for zircon powder raw materials, characterized in that: The system includes a vertical tower body, which is internally divided into a primary drying chamber and a secondary drying chamber from top to bottom. A conical shrinkage transition section connects the primary and secondary drying chambers. A feed hopper is provided at the top of the vertical tower body, and a discharge port is provided at the bottom of the vertical tower body. Several guide plates are provided in the primary and secondary drying chambers respectively. The distribution density of the guide plates in the secondary drying chamber is greater than that in the primary drying chamber. A hot air supply mechanism and a return material mechanism are provided on the vertical tower body.
2. The zircon powder raw material calcination and pre-drying equipment according to claim 1, characterized in that: Each of the aforementioned guide plates has an inverted V-shaped structure, and slots for installing the guide plates are provided in the primary drying chamber and the secondary drying chamber.
3. The zircon powder raw material calcination and pre-drying equipment according to claim 1, characterized in that: The hot air supply mechanism includes several hot air fans. The vertical tower body is provided with a hot air inlet and a heat dissipation outlet. The hot air inlet is located on the side wall of the secondary drying chamber, and the heat dissipation outlet is located on the top of the primary drying chamber. The air outlets of the several hot air fans are connected to the hot air inlet.
4. The zircon powder raw material calcination and pre-drying equipment according to claim 3, characterized in that: The vertical tower body is provided with an extended hot air cavity for communication with the hot air inlet.
5. The zircon powder raw material calcination and pre-drying equipment according to claim 3, characterized in that: Each of the hot air blowers is provided with a blower support for installation. The blower support is connected to the outer wall of the vertical tower body, and the bottom of the blower support is provided with a diagonal brace.
6. The zircon powder raw material calcination and pre-drying equipment according to claim 1, characterized in that: The return material mechanism includes a screw extruder, a return material drying pipe, and a negative pressure conveyor. The input end of the screw extruder is connected to the discharge port of the vertical tower body. The two ends of the return material drying pipe are respectively connected to the output end of the screw extruder and the feed hopper. The negative pressure conveyor is connected inside the return material drying pipe.
7. The zircon powder raw material calcination and pre-drying equipment according to claim 6, characterized in that: The screw extruder includes a cylinder, a variable pitch screw, and a servo motor. The cylinder is connected between the discharge port of the vertical tower and the return drying pipe. The variable pitch screw is rotatably connected inside the cylinder, and the output end of the servo motor is connected to the end of the variable pitch screw.
8. The zircon powder raw material calcination and pre-drying equipment according to claim 6, characterized in that: The wall of the return material drying tube is equipped with an infrared moisture monitor.