A mineral mass preheating device for zinc pyrometallurgy

Abstract

The utility model discloses a kind of ore group preheating equipment for pyrometallurgy zinc, including drying device, preheating device, drying device is set in the left side of preheating device, drying device, preheating device is respectively connected with production workshop control cabinet electric telecommunication.The function of the utility model is to shovel after the dry ore group from conveyor belt device, ensure the normal operation of device;It can make ore group rotate constantly while being preheated gas purging, make ore group heat evenly, prevent ore group cracking, ensure the preheating effect of ore group heat;Prevent condensation water accumulation, fall back on ore group and lead to return moisture, simultaneously, condensation water is quickly discharged, which can also prevent condensation water vaporization absorb heat in preheated gas, so as to ensure preheating effect.

Description

Technical Field

[0001] This utility model belongs to the field of pyrometallurgical zinc smelting technology, and in particular relates to a preheating device for zinc ore pellets used in pyrometallurgical zinc smelting. Background Technology

[0002] In the pyrometallurgical zinc smelting process, agglomerating ore powder into ore pellets for smelting can create voids between the pellets to improve permeability. The pellets also prevent pulverization, reduce dust levels, and the addition of reducing materials such as coke to the pellets can increase the reaction area and improve smelting efficiency. At the same time, preheating the pellets is a key step to ensure efficient reduction and smelting. After the ore powder is granulated and cold-pressed into pellets, it forms bentonite pellets containing 10% to 15% moisture. Therefore, preheating is required to remove volatiles from the pellets, enhance their thermal strength, and reduce thermal shock when entering the furnace.

[0003] A prior art ore pellet preheating device, such as the one disclosed in Chinese Patent (CN205223317U), includes a coarse ore conveying device, an airflow pre-dehydration device, and a roasting preheating device. The coarse ore conveying device is a double-roller belt conveyor with a steel belt. The airflow pre-dehydration device is located directly below the discharge section of the double-roller belt conveyor. Multiple airflow pre-dehydration baffles are installed on the cylindrical wall of the airflow pre-dehydration device, and the baffles have perforations. The lower end of the cylindrical airflow pre-dehydration device is connected to a roasting preheating zone. A preheating burner is located directly opposite the lower wall of the roasting preheating zone. The end of the roasting preheating zone is adjacent to the main dehydration zone. Multiple airflow jet dehydration devices are installed at the bottom of the main dehydration zone. Each airflow jet dehydration device consists of an airflow hood, an airflow conveying pipeline, and a high-pressure air pump. The bottom of the airflow hood is connected to a powder collection channel, and a powder collection valve is installed at the end of the powder collection channel.

[0004] This method has the following drawbacks: First, the device includes a pre-dehydration unit to dry the ore pellets before preheating. However, the technical specifications at the time did not clarify how the dried ore pellets would fall from the pre-dehydration unit into the roasting preheating unit. Furthermore, during operation, the dried ore pellets sometimes stick to the surface of the baffles, preventing them from smoothly entering the subsequent drying and preheating process, thus hindering normal preheating operation. Second, in the roasting preheating stage, the heating airflow blows the ore pellets downwards from above to raise their temperature for preheating. However, in this… During the process, the heat received by the ore pellet is uneven, with the bottom part receiving less heat. This uneven heating can lead to cracking, affecting the preheating effect and reducing efficiency in subsequent smelting processes. Thirdly, during the drying and roasting process, when the internal temperature of the device is not high, moisture from the ore pellet and the air is carried out by the drying and preheating airflow. This moisture condenses on the inner wall of the device and falls back down onto the ore pellet, causing it to become damp. If left in the device, this dampness will absorb heat from the drying airflow, reducing the device's preheating efficiency for the ore pellet.

[0005] Therefore, this utility model provides a preheating device for zinc ore pellets used in pyrometallurgical zinc smelting. Utility Model Content

[0006] To address the aforementioned technical problems, this utility model discloses a preheating device for zinc ore pellets in pyrometallurgical processes. This device scoops up the dried ore pellets from the conveyor belt, ensuring the normal operation of the equipment. It allows the ore pellets to rotate continuously while being purged by preheating gas, ensuring uniform heating, preventing cracking, and guaranteeing effective preheating. Furthermore, it prevents condensate accumulation and subsequent moisture return to the ore pellets, and the rapid discharge of condensate prevents vaporization and absorption of heat from the preheating gas, thus ensuring optimal preheating performance.

[0007] To achieve the above-mentioned technical effects, this utility model provides a preheating device for zinc ore pellets in pyrometallurgical zinc smelting, including a drying device and a preheating device. The drying device is located on the left side of the preheating device, and the drying device and the preheating device are electrically connected to the control cabinet of the production workshop. The preheating device also includes a conveyor belt device, an air supply pipe a, an air box a, and a gas collecting hood a. The air box a is located below the middle of the conveyor belt device, the air supply pipe a is located to the left of the air box a, and the gas collecting hood a is located above the conveyor belt device above the air box a. The drying device also includes an air supply pipe b, an air box b, a conveying device, and a gas collecting hood b. The conveying device is located below the right side of the conveyor belt device, the air box b is located below the conveying device, the air supply pipe b is located in front of the air box b, and the gas collecting hood b is located above the conveying device.

[0008] Preferably, the conveyor belt of the conveyor belt device is provided with air holes.

[0009] Preferably, the air box a is provided with a guide plate a at an angle inside.

[0010] Preferably, the gas collection hood a further includes a shell a, an exhaust pipe a, an arc strip a, a water collection trough a, and a drainage pipe a. The arc-shaped shell a is positioned above the conveyor belt device, the exhaust pipe a is positioned above the shell a, the arc strip a is positioned inside the upper part of the shell a, the water collection trough a is positioned inside the shell a and below the arc strip a, and the drainage pipe is positioned on the side of the water collection trough a.

[0011] Preferably, the left inlet and right outlet of the gas collecting hood a are further provided with a baffle plate, a drive motor a, a connecting rod, a cam, and a mounting bracket. The baffle plate is sealed and fitted on the outside of the gas collecting hood a, and the upper end of the baffle plate is hinged to the gas collecting hood a. The drive motor a is located on the side of the baffle plate. The mounting bracket is located below the drive motor a. The connecting rod is located on the side of the baffle plate and is rotatably connected to the gas collecting hood a. The cams are respectively located on the connecting rod and on the side of the baffle plate.

[0012] Preferably, the right end of the conveyor belt device is also provided with a scraper plate and a material distribution bar. The scraper plate is located at the right end of the conveyor belt device, the left side of the scraper bar is attached to the right end of the conveyor belt device, and the material distribution bar is located at the right side of the scraper bar.

[0013] Preferably, the air box b is provided with a guide plate b at an angle inside.

[0014] Preferably, the gas collection hood b further includes a housing b, an exhaust pipe b, an arc strip b, a water collection trough b, and a drainage pipe b. The housing b is located above the conveying device, the exhaust pipe b is located above the housing b, the arc strip b is located inside the housing b, the water collection trough b is located below the arc strip b, and the drainage pipe b is located on the side of the water collection trough b.

[0015] Preferably, the conveying device further includes a drive motor b, a threaded rod, a bracket, and a feeding mechanism. The drive motor b is located on the rear side of the threaded rod, and the threaded rod is rotatably mounted on the bracket. The output end of the drive motor b is connected to the left side of the threaded rod via a chain drive, and the feeding mechanism is located on the right side of the threaded rod.

[0016] Preferably, the feeding mechanism further includes a transmission sprocket, gear a, gear b, gear c, a rotating shaft, a feeding wheel, and a receiving plate. The transmission sprocket is located on the rear right end of the threaded rod and is connected to the right end of the threaded rod via a transmission chain. Gear a is coaxially located on the left side of the transmission sprocket, gear b is meshed on the left side of gear a, and gear c is meshed below gear b. The transmission shaft is located on the front side of gear c and rotatably mounted on a bracket below the threaded rod. The feeding wheels are respectively mounted on the transmission shaft and located between the threaded rods. The receiving plate is mounted on a bracket on the right side of the feeding wheel.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The device is equipped with a preheating unit, a shovel plate, and a feeding rod. These components scoop up the dried ore from the conveyor belt and distribute it evenly, preventing the ore from sticking to the conveyor belt and hindering its progress to the next stage, thus ensuring the device's normal operation. A drive motor (b), a threaded rod, a support, and a feeding mechanism allow the ore to rotate continuously while being purged by preheated gas, ensuring uniform heating, preventing cracking, and guaranteeing effective preheating. Two gas collection hoods (a and b) collect and drain the moisture condensed in the airflow after drying the ore, preventing water accumulation and subsequent dampness on the ore. Rapid drainage also prevents the condensate from vaporizing and absorbing heat from the preheated gas, thus ensuring optimal preheating efficiency. Attached Figure Description

[0019] Figure 1 This is a front view of the present invention;

[0020] Figure 2 This is the left view of this utility model;

[0021] Figure 3 yes Figure 2 Isometric view of section a;

[0022] Figure 4 yes Figure 3 A partial schematic diagram of b in the middle;

[0023] Figure 5 yes Figure 3 A partial schematic diagram of c in the middle;

[0024] Figure 6 yes Figure 3 A partial schematic diagram of d in the middle;

[0025] Figure 7 This is an isometric side view of the front view of this utility model;

[0026] Figure 8 This is an isometric side view of the rear view of this utility model;

[0027] Figure 9 yes Figure 8 A partial schematic diagram of 'e' in the middle;

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Conveyor belt device; 2. Air supply duct a; 3. Air box a; 4. Air collection hood a; 5. Air supply duct b; 6. Air box b; 7. Conveying device; 8. Air collection hood b; 9. Guide plate a; 10. Housing a; 11. Exhaust duct a; 12. Arc strip a; 13. Water collection tank a; 14. Drainage pipe a; 15. Wind baffle; 16. Drive motor a; 17. Connecting rod; 18. Cam; 19. Installation Frame; 20. Shovel plate; 21. Material placing rod; 22. Guide plate b; 23. Shell b; 24. Exhaust pipe b; 25. Arc strip b; 26. Water collection tank b; 27. Drainage pipe b; 28. Drive motor b; 29. ​​Threaded rod; 30. Bracket; 31. Transmission sprocket; 32. Gear a; 33. Gear b; 34. Gear c; 35. Rotating shaft; 36. Feeding wheel; 37. Receiving plate. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] The prior art in this embodiment has the following problems: The inventors found the following defects in the prior art: First, the device sets up a pre-dehydration device to dry the ore pellets before preheating. At that time, the technical solution did not clearly explain how the dried ore pellets fell from the pre-dehydration device into the roasting preheating device. At the same time, during the use of the device, the ore pellets would stick to the surface of the partition after drying, which would prevent the ore pellets from smoothly entering the subsequent drying and preheating device, causing the preheating work to malfunction; Second, in the roasting preheating stage of the device, the heating airflow blows the ore pellets from above downwards to increase the temperature of the ore pellets. Preheating is achieved by raising the temperature, but during this process, the heat received by the ore pellet is uneven. The part at the bottom of the pellet receives less heat, which can lead to uneven heating and cracking, affecting the preheating effect and reducing the efficiency of subsequent smelting processes. Third, during the drying and roasting process, when the temperature inside the device is not high, the moisture inside the pellet and the air is carried out by the drying and preheating airflow. This moisture condenses on the inner wall of the device and falls back down the inner wall. When this moisture falls onto the pellet, it causes the pellet to become damp. If it remains in the device, it will absorb heat from the drying airflow, reducing the device's preheating efficiency for the pellet. Example 1

[0032] like Figures 1 to 9 As shown:

[0033] Therefore, the inventor provides a preheating device for zinc ore pellets in pyrometallurgical zinc smelting, including a drying device and a preheating device. The drying device is located on the left side of the preheating device, and the drying device and the preheating device are electrically connected to the production workshop control cabinet (not shown in the figure). The preheating device also includes a conveyor belt device 1, an air supply pipe a2, an air box a3, and a gas collecting hood a4. The air box a3 is located below the middle of the conveyor belt device 1, the air supply pipe a2 is located to the left of the air box a3, and the gas collecting hood a4 is located above the conveyor belt device 1 above the air box a3. The drying device also includes an air supply pipe b5, an air box b6, a conveying device 7, and a gas collecting hood b8. The conveying device 7 is located below the right side of the conveyor belt device 1, the air box b6 is located below the conveying device 7, the air supply pipe b5 is located in front of the air box b6, and the gas collecting hood b8 is located above the conveying device 7.

[0034] Using the above scheme, the ore agglomerates produced after granulation and agglomeration are conveyed to the right by the conveyor belt device 1 into the gas collecting hood a4. Inside the gas collecting hood a4, the drying airflow sent to the air box a3 through the air supply pipe a2 blows upward and dries the agglomerates. The moisture on the surface of the agglomerates is dried by the airflow and collected by the gas collecting hood a4 before being discharged. The dried agglomerates are then sent to the right by the conveyor belt device 1 above the conveyor device 7. Driven by the conveyor device 7, the agglomerates continue to move to the right. At the same time, the agglomerates themselves rotate during the rightward transport. The preheated air blown into the air box b6 by the air supply pipe b5 dries and preheats the agglomerates. The preheated gas is collected by the gas collecting hood b8 and discharged. The preheated agglomerates are discharged to the right and fall into the subsequent process for smelting. Example 2

[0035] like Figures 1 to 9 As shown:

[0036] Furthermore, the conveyor belt of the conveyor belt device 1 is provided with air holes (not shown in the figure).

[0037] Furthermore, a guide vane a9 is inclinedly installed inside the bellows a3;

[0038] Furthermore, the gas collection hood a4 also includes a housing a10, an exhaust pipe a11, an arc strip a12, a water collection tank a13, and a drainage pipe a14. The arc-shaped housing a10 is located above the conveyor belt device 1, the exhaust pipe a11 is located above the housing a10, the arc strip a12 is located inside the upper part of the housing a10, the water collection tank a13 is located inside the housing a10 and below the arc strip a12, and the drainage pipe is located on the side of the water collection tank a13.

[0039] Furthermore, the left inlet and right outlet of the gas collection hood a4 are also provided with a baffle plate 15, a drive motor a16, a connecting rod 17, a cam 18, and a mounting bracket 19. The baffle plate 15 is sealed and fitted on the outside of the gas collection hood a4, and the upper end of the baffle plate 15 is hinged to the gas collection hood a4. The drive motor a16 is located on the side of the baffle plate 15. The mounting bracket 19 is located below the drive motor a16. The connecting rod 17 is located on the side of the baffle plate 15 and is rotatably connected to the gas collection hood a4. The cam 18 is respectively located on the connecting rod 17 and is located on the side of the baffle plate 15.

[0040] In this process, a blower (not shown in the figure) is installed at the front end of the exhaust pipe a11. The blower sends the gas used for drying the ore into the air box a3. After being diverted by the guide plate a9, the gas is blown upwards through the air holes on the conveyor belt to dry the surface of the ore. After the moisture on the surface of the ore is dried, the airflow containing water vapor gathers above the gas collection hood a4. An induced draft fan (not shown in the figure) is installed at the end of the exhaust pipe a11 to extract the gas from the gas collection hood a4. During the process, the water vapor in the airflow will condense on the inner wall of the shell a10 of the gas collection tank a, and after arcing... After being guided and gathered, the water from strip a12 falls along the shell a10 towards both sides into the water collection tank a13, and then is discharged through the drainage pipe a14. A condensate drain valve group can be installed on the drainage pipe a14 to ensure smooth drainage. By setting the flow guide arc plate a and the water collection tank a13 to collect condensate, the water condensed in the airflow after drying the ore can be collected and discharged, preventing the condensate from accumulating inside the shell a10 and falling back onto the ore, causing dampness. The gas used to dry the ore can be the treated kiln exhaust gas or the dried drying gas.

[0041] As the ore pellets move rightward along the conveyor belt 1 into the gas collecting hood a4, the drive motor a16 drives the cam 18 on the connecting rod 17 to rotate. Simultaneously, the rotation of the cam 18, in coordination with the feeding rhythm of the conveyor belt 1, causes the baffle plate 15 to open and close regularly with the frequency of the ore pellets entering. This prevents the dry airflow inside the gas collecting hood from overflowing while simultaneously placing the ore pellets into the gas collecting hood a4. After being blown dry inside the gas collecting hood a4, the ore pellets leave the gas collecting hood a4. The outlet of the gas collecting hood a4 is also equipped with the same mechanism as the inlet, except that the baffle plate 15 on the outlet side of the gas collecting hood a4 rotates to the right to open and close. The connecting rod 17 and the cam 18 are located inside the gas collecting hood a4, facilitating opening along the material conveying direction and ensuring the normal operation of the material conveying process. Example 3

[0042] like Figures 1 to 9 As shown:

[0043] Furthermore, the right end of the conveyor belt device 1 is also provided with a scraper plate 20 and a material distribution bar 21. The scraper plate 20 is located at the right end of the conveyor belt device 1, the left side of the scraper bar is attached to the right end of the conveyor belt device 1, and the material distribution bar 21 is located on the right side of the scraper bar.

[0044] Furthermore, a guide vane b22 is inclinedly arranged inside the bellows b6;

[0045] Furthermore, the gas collection hood b8 also includes a housing b23, an exhaust pipe b24, an arc strip b25, a water collection tank b26, and a drainage pipe b27. The housing b23 is located above the conveying device 7, the exhaust pipe b24 is located above the housing b23, the arc strip b25 is located inside the housing b23, the water collection tank b26 is located below the arc strip b25, and the drainage pipe b27 is located on the side of the water collection tank b26.

[0046] Furthermore, the conveying device 7 also includes a drive motor b28, a threaded rod 29, a bracket 30, and a feeding mechanism. The drive motor b28 is located on the rear side of the threaded rod 29, and the threaded rod 29 is rotatably mounted on the bracket 30. The output end of the drive motor b28 is connected to the left side of the threaded rod 29 via a chain drive, and the feeding mechanism is located on the right side of the threaded rod 29.

[0047] Furthermore, the feeding mechanism also includes a transmission sprocket 31, gear a32, gear b33, gear c34, rotating shaft 35, feeding wheel 36, and receiving plate 37. The transmission sprocket 31 is located on the rear right side of the threaded rod 29 and is connected to the right end of the threaded rod 29 by a transmission chain. Gear a32 is coaxially located on the left side of the transmission sprocket 31. Gear b33 is meshed on the left side of gear a32. Gear c34 is meshed below gear b33. The transmission shaft is located on the front side of gear c34 and rotatably mounted on a bracket 30 below the threaded rod 29. The feeding wheels 36 are respectively mounted on the transmission shaft and located between the threaded rods 29. The receiving plate 37 is mounted on the bracket 30 on the right side of the feeding wheel 36.

[0048] After the surface-dried ore particles leave the inside of the gas collecting hood a4, they move to the right to the end of the conveyor belt device 1. The ore particles are scooped up by the shovel plate 20 attached to the surface of the conveyor belt device 1. The ore particles roll down to the right along the shovel bar and fall to the right onto the conveyor device 7 through the gap between the material distribution bars 21. In this way, by setting the shovel plate 20 to connect the drying device and the preheating device, the ore particles are scooped up from the conveyor belt device 1 and evenly distributed onto the conveyor device 7, preventing the ore particles from sticking to the conveyor belt and causing them to be unable to enter the next process smoothly, thus ensuring the normal operation of the device.

[0049] The ore pellet falls along the cloth bar 21 between the threaded bars 29. The drive motor b28 drives the threaded bar 29 to rotate through the transmission chain and the transmission sprocket 31. The threads on the surface of the threaded bar 29 drive the ore pellet to move to the right while making the ore pellet itself rotate continuously. A high-temperature resistant rubber coating layer can be set on the surface of the threads to prevent damage to the ore pellet when the threaded bar 29 rotates. This allows the ore pellet to rotate continuously while being purged by preheated gas, so that the ore pellet is heated evenly, preventing the ore pellet from cracking and ensuring the heating and preheating effect of the ore pellet.

[0050] While the ore pellet is being conveyed to the right by the threaded rod 29, a blower at the front end of the air supply pipe b5 sends high-temperature preheated gas into the air box b6. The high-temperature preheated gas can be treated high-temperature kiln exhaust gas or high-temperature gas that has been heated and dried. After being diverted by the guide plate b22, the gas is blown upward to preheat the ore pellet. The blown airflow gathers upward above the gas collection hood b8. The exhaust pipe b24 is connected to an induced draft fan to draw the gas generated after blowing the ore pellet upward. After being treated and the waste heat is recovered, the gas is discharged. During the process, the moisture carried out by the preheated gas from the ore pellet condenses on the inner wall of the shell b23. The condensate flows along the arc b2 5. The condensate falls to both sides and into the water collection tank b26. After being collected by the drainage pipe b27, it is discharged. A condensate drain valve group can be installed on the drainage pipe b27 to ensure the normal discharge of condensate. This setting allows the condensate carried out by the preheating airflow from the ore to be discharged quickly, preventing the condensate from falling back onto the ore and causing the ore to become damp. At the same time, the arc plate b increases the contact area between water vapor and the inner wall of the shell b23. It can also guide the condensate into the interior of the water collection tank b26. The rapid discharge of the condensate can also prevent the condensate from vaporizing and absorbing the heat in the preheating gas, which would cause the preheating gas temperature to drop and waste resources, thus ensuring the preheating effect.

[0051] After the ore pellet moves to the end of the threaded rod 29, the gear a32, which is linked to the right end of the threaded rod 29 through the transmission chain, drives the gear b33 to rotate. The gear b33 drives the gear c34 to rotate, causing the feeding wheel 36 on the rotating shaft 35 to rotate in the feeding direction. When the ore pellet comes above the feeding wheel 36, the feeding wheel 36 lifts the ore pellet upward and then feeds the ore pellet downward from above the feeding wheel 36 onto the receiving plate 37. The ore pellet falls onto the receiving plate 37 and falls to the right to the next processing step, completing the preheating treatment of the ore pellet.

[0052] In summary, this device is equipped with a preheating unit, a shovel plate 20, and a distribution rod 21. These components scoop the dried ore from the conveyor belt 1 and distribute it evenly onto the conveyor belt 7, preventing the ore from sticking to the conveyor belt and hindering its progress to the next process, thus ensuring the normal operation of the device. The device also includes a drive motor b28, a threaded rod 29, a support 30, and a feeding mechanism, allowing the ore to rotate continuously while being purged by preheated gas. This ensures uniform heating of the ore, prevents cracking, and guarantees effective preheating. Furthermore, the device includes gas collection hoods a4 and b8, which collect and drain the moisture condensed in the airflow after drying the ore. This prevents condensate from accumulating and falling back onto the ore, causing dampness. Rapid drainage of condensate also prevents it from vaporizing and absorbing heat from the preheated gas, thus avoiding a drop in gas temperature and resource waste, and ensuring optimal preheating performance.

[0053] The working principle of this utility model:

[0054] The granulated granules are conveyed to the right by conveyor belt 1 into the gas collection hood a4. A blower is installed at the front end of the exhaust pipe a11, which sends the gas for drying the granules into the air box a3. After being diverted by the guide plate a9, the gas is blown upwards through the air holes on the conveyor belt to dry the surface of the granules. After the moisture on the surface of the granules is dried, the air containing water vapor gathers above the gas collection hood a4. An induced draft fan is installed at the end of the exhaust pipe a11 to extract the gas from the gas collection hood a4. During the process, the water vapor in the airflow will condense on the shell a10 of the gas collection trough a. On the inner wall, after being guided and gathered by the arc strip a12, the water falls along the shell a10 towards both sides into the water collection tank a13, and then is discharged through the drainage pipe a14. A condensate drain valve group can be installed on the drainage pipe a14 to ensure smooth drainage. By setting the flow guide arc plate a and the water collection tank a13 to collect condensate, the water condensed in the airflow after drying the ore can be collected and discharged, preventing the condensate from accumulating inside the shell a10 and falling back onto the ore, causing dampness. The gas used to dry the ore can be the treated kiln exhaust gas or the dried drying gas.

[0055] As the ore pellets move rightward along the conveyor belt 1 into the gas collection hood a4, the drive motor a16 drives the cam 18 on the connecting rod 17 to rotate. Simultaneously, the rotation of the cam 18, in coordination with the feeding rhythm of the conveyor belt 1, causes the baffle plate 15 to open and close regularly with the frequency of the ore pellets entering, preventing the dry airflow inside the gas collection hood from overflowing while simultaneously placing the ore pellets into the gas collection hood a4. After being blown dry inside the gas collection hood a4, the ore pellets leave the gas collection hood a4. The outlet of the gas collection hood a4 is also equipped with the same mechanism as the inlet, the difference being that the baffle plate 15 on the outlet side of the gas collection hood a4 rotates to the right to open and close. The connecting rod 17 and the cam 18 are located inside the gas collection hood a4, facilitating opening along the material conveying direction and ensuring the normal operation of the material conveying process.

[0056] After the surface-dried ore particles leave the inside of the gas collecting hood a4, they move to the right to the end of the conveyor belt device 1. The ore particles are scooped up by the shovel plate 20 attached to the surface of the conveyor belt device 1. The ore particles roll down to the right along the shovel bar and fall to the right onto the conveyor device 7 through the gap between the material distribution bars 21. In this way, by setting the shovel plate 20 to connect the drying device and the preheating device, the ore particles are scooped up from the conveyor belt device 1 and evenly distributed onto the conveyor device 7, preventing the ore particles from sticking to the conveyor belt and causing them to be unable to enter the next process smoothly, thus ensuring the normal operation of the device.

[0057] The ore pellet falls along the cloth bar 21 between the threaded bars 29. The drive motor b28 drives the threaded bar 29 to rotate through the transmission chain and the transmission sprocket 31. The threads on the surface of the threaded bar 29 drive the ore pellet to move to the right while making the ore pellet itself rotate continuously. A high-temperature resistant rubber coating layer can be set on the surface of the threads to prevent damage to the ore pellet when the threaded bar 29 rotates. This allows the ore pellet to rotate continuously while being purged by preheated gas, so that the ore pellet is heated evenly, preventing the ore pellet from cracking and ensuring the heating and preheating effect of the ore pellet.

[0058] While the ore pellet is being conveyed to the right by the threaded rod 29, a blower installed at the front end of the air supply pipe b5 sends high-temperature preheated gas into the air box b6. The high-temperature preheated gas can be treated high-temperature kiln exhaust gas or high-temperature gas that has been heated and dried. After being diverted by the guide plate b22, the gas is blown upward to preheat the ore pellet. The purged airflow gathers upward above the gas collection hood b8. The exhaust pipe b24 is connected to an induced draft fan to draw the gas generated after purging the ore pellet upward. After being treated and the waste heat is recovered, the gas is discharged. The negative pressure generated by the induced draft fan can be greater than the positive pressure generated by the blower to prevent the high-temperature gas from overflowing from the outlets on both sides of the gas collection hood b8. During the process, the moisture carried out by the preheated gas from the ore pellet condenses. On the inner wall of the shell b23, condensate falls along the arc b25 to both sides, falls into the water collection tank b26, is collected through the drainage pipe b27 and then discharged. A condensate drain valve group can be installed on the drainage pipe b27 to ensure normal discharge of condensate. This arrangement allows the condensate carried out by the preheating airflow from the ore to be discharged quickly, preventing the condensate from falling back onto the ore and causing the ore to become damp. At the same time, the arc plate b increases the contact area between water vapor and the inner wall of the shell b23, and can also guide the condensate into the interior of the water collection tank b26. The rapid discharge of condensate can also prevent the condensate from vaporizing and absorbing the heat in the preheating gas, which would cause the preheating gas temperature to drop and waste resources, thus ensuring the preheating effect.

[0059] After the ore pellet moves to the end of the threaded rod 29, the gear a32, which is linked to the right end of the threaded rod 29 through the transmission chain, drives the gear b33 to rotate. The gear b33 drives the gear c34 to rotate, causing the feeding wheel 36 on the rotating shaft 35 to rotate in the feeding direction. When the ore pellet comes above the feeding wheel 36, the feeding wheel 36 lifts the ore pellet upward and then feeds the ore pellet downward from above the feeding wheel 36 onto the receiving plate 37. The ore pellet falls onto the receiving plate 37 and falls to the right to the next processing step, completing the preheating treatment of the ore pellet.

[0060] This concludes the description of the working principle of the device.

[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A preheating device for zinc ore pellets in pyrometallurgical zinc smelting, comprising a drying device and a preheating device, wherein the drying device is disposed to the left of the preheating device, and the drying device and the preheating device are electrically connected to the control cabinet of the production workshop, characterized in that: The preheating device further includes a conveyor belt device, an air supply pipe a, an air box a, and a gas collection hood a. The air box a is located below the middle of the conveyor belt device, the air supply pipe a is located to the left of the air box a, and the gas collection hood a is located above the conveyor belt device above the air box a. The drying device further includes an air supply pipe b, an air box b, a conveying device, and a gas collection hood b. The conveying device is located below the right side of the conveyor belt device, the air box b is located below the conveying device, the air supply pipe b is located in front of the air box b, and the gas collection hood b is located above the conveying device.

2. The ore preheating equipment for pyrometallurgical zinc smelting according to claim 1, characterized in that: The conveyor belt of the aforementioned conveyor belt device is provided with air holes.

3. The ore preheating equipment for pyrometallurgical zinc smelting according to claim 1, characterized in that: The air box a is inclinedly provided with a guide plate a.

4. The ore preheating equipment for pyrometallurgical zinc smelting according to claim 1, characterized in that: The gas collection hood a further includes a shell a, an exhaust pipe a, an arc strip a, a water collection trough a, and a drainage pipe a. The arc-shaped shell a is positioned above the conveyor belt device, the exhaust pipe a is positioned above the shell a, the arc strip a is positioned inside the upper part of the shell a, the water collection trough a is positioned inside the shell a and below the arc strip a, and the drainage pipe is positioned on the side of the water collection trough a.

5. A preheating device for zinc ore pellets in pyrometallurgical zinc smelting according to claim 1, characterized in that: The left inlet and right outlet of the gas collection hood a are also provided with a baffle plate, a drive motor a, a connecting rod, a cam, and a mounting bracket. The baffle plate is sealed and fitted on the outside of the gas collection hood a, and the upper end of the baffle plate is hinged to the gas collection hood a. The drive motor a is located on the side of the baffle plate. The mounting bracket is located below the drive motor a. The connecting rod is located on the side of the baffle plate and is rotatably connected to the gas collection hood a. The cams are respectively located on the connecting rod and on the side of the baffle plate.

6. The ore preheating equipment for pyrometallurgical zinc smelting according to claim 1, characterized in that: The right end of the conveyor belt device is also provided with a shovel plate and a material distribution bar. The shovel plate is located at the right end of the conveyor belt device, the left side of the shovel bar is attached to the right end of the conveyor belt device, and the material distribution bar is located on the right side of the shovel bar.

7. A preheating device for zinc ore pellets in pyrometallurgical zinc smelting according to claim 1, characterized in that: The air box b is inclined inside and has a guide plate b.

8. A preheating device for zinc ore pellets in pyrometallurgical zinc smelting according to claim 1, characterized in that: The gas collection hood b also includes a housing b, an exhaust pipe b, an arc strip b, a water collection tank b, and a drainage pipe b. The housing b is located above the conveying device, the exhaust pipe b is located above the housing b, the arc strip b is located inside the housing b, the water collection tank b is located below the arc strip b, and the drainage pipe b is located on the side of the water collection tank b.

9. A preheating device for zinc ore pellets in pyrometallurgical zinc smelting according to claim 1, characterized in that: The conveying device further includes a drive motor b, a threaded rod, a bracket, and a feeding mechanism. The drive motor b is located on the rear side of the threaded rod, and the threaded rod is rotatably mounted on the bracket. The output end of the drive motor b is connected to the left side of the threaded rod via a chain drive, and the feeding mechanism is located on the right side of the threaded rod.

10. A preheating device for zinc ore pellets in pyrometallurgical zinc smelting according to claim 9, characterized in that: The feeding mechanism further includes a transmission sprocket, gear a, gear b, gear c, a rotating shaft, a feeding wheel, and a receiving plate. The transmission sprocket is located on the rear right end of the threaded rod and is connected to the right end of the threaded rod via a transmission chain. Gear a is coaxially located on the left side of the transmission sprocket, gear b is meshed on the left side of gear a, and gear c is meshed below gear b. The transmission shaft is located on the front side of gear c and rotatably mounted on a bracket below the threaded rod. The feeding wheels are respectively mounted on the transmission shaft and located between the threaded rods. The receiving plate is located on a bracket on the right side of the feeding wheel.

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