A kind of pre-wetting balling mixing equipment for return fines and dusting ash

Abstract

The application discloses a kind of return ore, dust pre-wetting balling mixing equipment, it is related to steel sintering raw material pretreatment field, specifically including outer shell, wetting treatment unit and wind blow control water unit are sequentially arranged in outer shell along material conveying direction, wetting treatment unit includes the filter screen cylinder of inclined arrangement;Longitudinal material lifting baffle parallel to rotating shaft is arranged on the surface of inclined arrangement screw conveying shaft, and bottom layer material is continuously lifted and thrown with shaft rotation, and the atomizing spray assembly of being provided on the outer wall of filter screen cylinder penetrates water from outside to inside, can completely break the static material layer stratification state of conventional screw conveying, avoid the inherent defects of upper layer overwetting, bottom layer underwetting, outer wet inner dry caused by traditional built-in spray, belt water supply mode, make return ore porous structure to be fully immersed in all directions, improve the uniformity and cohesive activity of material surface water film, provide stable raw material pretreatment basis for subsequent sintering balling process.

Description

Technical Field

[0001] This invention relates to the field of steel sintering raw material pretreatment, specifically to a pre-wetting and pelletizing mixing device for returned ore and dust removal ash. Background Technology

[0002] In the steel sintering process, recycled ore and dust are core recycled iron-containing raw materials. The pretreatment wetting, mixing, and pelletizing effects directly determine the forming quality of the sintered materials, the strength of the sintered products, and the overall production stability. It is a key pre-process to ensure the efficient and high-quality operation of the sintering process. Uniform material wetting, stable and controllable moisture content, and clean and efficient material mixing and pelletizing effects can greatly improve the bonding activity of powder particles, reduce dust, material segregation, and forming defects during the sintering process. This is of great significance for reducing sintering energy consumption, improving the utilization rate of solid waste resources, and optimizing sintering production conditions. Therefore, how to achieve uniform wetting, precise water control, and continuous mixing and pelletizing of recycled ore and dust powder is a long-term key core technology in the field of steel sintering solid waste pretreatment.

[0003] Currently, the methods for wetting and pelletizing the return ore and dust removal ash are relatively traditional. Most mainstream pretreatment equipment adopts a single spray mixing or static water addition and mixing mode. Among them, conventional mixing equipment relies on simple spiral pushing combined with top spraying to complete the water addition operation. During the material transportation process, material layer accumulation and layer solidification are prone to occur. The bottom material cannot come into contact with the spray water source for a long time, which easily leads to the material being wet on the outside and dry on the inside, and uneven wetting. It is difficult to fully activate the powder binding activity, resulting in poor pelleting consistency. In addition, some water-controlled pretreatment equipment adopts a one-time quantitative water addition mode, which cannot accurately control the moisture content according to the material adsorption characteristics. It is easy to have problems such as excessive moisture content, excessive surface free water, or insufficient wetting. The moisture content fluctuates greatly, which seriously affects the quality of subsequent sintering and pelletizing.

[0004] Nowadays, steel sintering production is gradually developing towards high capacity, low energy consumption, greening, and refined management. This places higher demands on the wetting uniformity, moisture content stability, operational continuity, and resource utilization of return ore and dust ash pretreatment. Therefore, it is necessary to propose a pre-wetting and pelletizing mixing equipment for return ore and dust ash to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a pre-wetting and pelletizing mixing device for ore return and dust removal ash to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a pre-wetting and pelletizing mixing device for ore return and dust removal, including an outer shell, wherein a wetting treatment unit and an air blowing water control unit are arranged sequentially along the material conveying direction inside the outer shell; The wetting treatment unit includes an inclined filter cylinder, a spiral conveying shaft coaxially disposed inside the filter cylinder, and an atomizing spray assembly disposed at the top of the inner wall of the outer casing and with the spraying direction facing the outer wall of the filter cylinder. The air-blowing water control unit includes a dewatering cylinder that is smoothly connected to the discharge end of the filter cylinder, a discharge conveying shaft coaxially disposed inside the dewatering cylinder, and an air jet nozzle that is inclined toward the feed inlet of the dewatering cylinder. The inner bottom of the outer casing is provided with a flow guide groove, and a humidifying water tank is provided below the outer casing. The water outlet of the flow guide groove is connected to the humidifying water tank. The humidifying water tank is provided with a circulating water filter screen plate, and the water outlet of the humidifying water tank is connected to the atomizing spray assembly.

[0007] A further improvement of the technical solution of the present invention is that: a partition is provided inside the outer shell to divide the internal space into two relatively independent cavities, and the wetting treatment unit and the air blowing water control unit are respectively arranged inside the two cavities to reduce mutual interference between the two during operation.

[0008] A further improvement of the technical solution of the present invention is that: the guide channel is set on the bottom surface of two cavities inside the outer casing, and is integrally connected by two inclined channels, and is set parallel to the dewatering cylinder and the filter cylinder respectively.

[0009] A further improvement of the technical solution of the present invention is that: the filter cylinder and the dewatering cylinder are fixedly installed inside the outer casing, the filter cylinder and the dewatering cylinder are connected by a reducing pipe, and the cylinder walls of the filter cylinder and the dewatering cylinder are both permeable filter structures.

[0010] A further improvement of the technical solution of the present invention is that: the sides of the dewatering cylinder and the filter cylinder are respectively provided with drive motors for driving the spiral conveying shaft and the discharge conveying shaft to rotate, and the movements of the spiral conveying shaft and the discharge conveying shaft do not affect each other.

[0011] A further improvement of the technical solution of the present invention is that: a discharge conveying shaft is provided at one end of the bottom surface of the dewatering cylinder, the discharge conveying shaft is connected to the dewatering cylinder, and the output end of the discharge conveying shaft penetrates the bottom surface of the outer casing.

[0012] A further improvement of the technical solution of the present invention is that: a blower is also provided on the bottom surface of the outer casing, and the air jet nozzle is connected to the blower through a ventilation pipe.

[0013] A further improvement of the technical solution of the present invention is that: the atomizing spray assembly is provided with multiple atomizing nozzles inside, and the multiple atomizing nozzles are arranged at equal intervals along the material conveying direction at the top of the inner cavity of the outer casing.

[0014] A further improvement of the technical solution of the present invention is that: the humidifying water tank is located directly below the outer casing, the humidifying water tank is provided with a sedimentation chamber and a water storage chamber, the output end of the guide channel is located inside the sedimentation chamber, and the circulating water filter screen is located at the connection between the sedimentation chamber and the water storage chamber.

[0015] A further improvement of the technical solution of the present invention is that: a guide plate is provided on the bottom surface of the water storage chamber inside the humidifying water tank, and a circulating water pump is provided on the outer side of the humidifying water tank at a low position corresponding to the guide plate, and the atomizing spray assembly is connected to the output end of the circulating water pump.

[0016] The beneficial effects of this invention are as follows: This invention features a longitudinal lifting baffle parallel to the rotating shaft on the surface of an inclined spiral conveyor shaft. As the shaft rotates, it continuously lifts and throws down the bottom layer of material. Combined with an atomizing spray assembly located on the outer wall of the filter cylinder, water is supplied from the outside in. This completely breaks the static layering of material in conventional spiral conveyors and avoids the inherent defects of excessive wetness in the upper layer and insufficient wetness in the lower layer, as well as the external wetness and internal dryness, caused by traditional built-in spraying and belt water supply methods. This allows the porous structure of the returned ore to be fully wetted from all directions, improving the uniformity and adhesion activity of the water film on the material surface, and providing a stable raw material pretreatment foundation for the subsequent sintering and pelletizing process.

[0017] This invention also uses sufficient atomized spraying to saturate the material with moisture, and then uses inclined jet nozzles to output high-speed shear airflow to precisely remove excess free water from the particle surface, leaving only pore-adsorbed water and a uniform surface water film. This achieves flexible control of the final moisture content, overcoming the technical defects of traditional single-step water addition methods that are easily affected by fluctuations in incoming flow rate and initial moisture content, and are prone to insufficient wetting or rebound of over-wetting fine powder. It replaces the traditional single water addition and quantity control path, and can stably lock the final moisture content of the material within the optimal process range, reducing the fluctuation range of the particle size composition of the mixture.

[0018] This invention also employs a filter cylinder with a permeable filter screen structure on its cylinder wall and a dewatering cylinder to carry and transport materials. In conjunction with a guide channel set at the bottom of the outer casing, the leachate wastewater is collected by gravity into a humidifying water tank. After gravity settling in the sedimentation chamber and grading purification by the circulating water filter screen, it is reused by the circulating water pump. At the same time, the atomizing spray component is arranged on the outside of the cylinder so that it does not come into direct contact with high dust materials. Solid-liquid separation can be completed in situ throughout the material transport process without the need for additional independent solid-liquid separation equipment and wastewater lifting device. This eliminates the maintenance pain points of traditional built-in nozzles that are prone to clogging and wear, and wastewater overflow that is difficult to collect. It reduces the consumption of fresh water and the frequency of equipment maintenance. The equipment has a compact structure and lower operating energy consumption, making it suitable for the continuous and high-intensity production conditions of the sintering process. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 This is a schematic diagram of the filter cylinder structure of the present invention; Figure 4 This is a schematic diagram of the dehydration cylinder of the present invention; Figure 5 This is a schematic diagram of the internal structure of the outer casing of the present invention; Figure 6 This is a schematic diagram of the flow guide channel of the present invention; Figure 7 This is a schematic diagram of the structure of the humidification tank of the present invention; Figure 8 This is a schematic diagram of the internal structure of the humidification tank of the present invention; In the diagram: 1. Outer casing; 2. Wetting water tank; 3. Atomizing spray assembly; 4. Filter screen cylinder; 5. Dewatering cylinder; 6. Screw conveyor shaft; 7. Discharge conveyor shaft; 8. Air jet nozzle; 9. Guide channel; 10. Circulating water filter screen plate; Detailed Implementation

[0020] The present invention will be further described in detail below with reference to embodiments: Example 1: As Figure 1-8 As shown, the present invention provides a pre-wetting and pelletizing mixing device for ore return and dust removal, including an outer shell 1. A wetting treatment unit and a wind-blown water control unit are arranged sequentially inside the outer shell 1 along the material conveying direction. A blower is also provided on the bottom surface of the outer shell 1. An air jet nozzle 8 is connected to the blower through a ventilation pipe. Multiple atomizing nozzles are provided inside the atomizing spray assembly 3. The multiple atomizing nozzles are arranged at equal intervals on the top of the inner cavity of the outer shell 1 along the material conveying direction. The outer casing 1 has a material inlet on its side wall for feeding material into the filter cylinder 4; the outer casing 1 has two independent cavities inside, which are connected by a guide channel 9 to achieve liquid passage, while the material passage is connected to the dewatering cylinder 5 through the filter cylinder 4; the bottom surface of the cavity of the outer casing 1 corresponding to the wetting treatment unit is inclined to guide the flow of excess wetting water and achieve automatic collection of leachate by gravity; The wetting treatment unit includes an inclined filter cylinder 4, a spiral conveying shaft 6 coaxially disposed inside the filter cylinder 4, and an atomizing spray assembly 3 disposed on the top of the inner wall of the outer casing 1 with the spraying direction facing the outer wall of the filter cylinder 4. The filter cylinder 4 and the dewatering cylinder 5 are fixedly installed inside the outer casing 1. The filter cylinder 4 and the dewatering cylinder 5 are connected by a reducing pipe. The cylinder walls of the filter cylinder 4 and the dewatering cylinder 5 are both permeable filter structures. The sides of the dewatering cylinder 5 and the filter cylinder 4 are respectively provided with drive motors that drive the spiral conveying shaft 6 and the discharge conveying shaft 7 to rotate. The movement of the spiral conveying shaft 6 and the discharge conveying shaft 7 does not affect each other. The discharge conveying shaft 7 is provided at one end of the bottom surface of the dewatering cylinder 5. The discharge conveying shaft 7 is connected to the dewatering cylinder 5. The output end of the discharge conveying shaft 7 passes through the bottom surface of the outer casing 1. The filter cylinder 4 is arranged at an angle of 10° within the wetting chamber; the dewatering cylinder 5 is arranged parallel to the reference horizontal plane within the outer casing 1. The two are smoothly connected by a reducing pipe to ensure stable material transfer from the filter cylinder 4 to the dewatering cylinder 5. The reducing pipe adopts an eccentric structure design with a large top inclination angle and a bottom flush with the bottom surface of the dewatering cylinder 5, which can cooperate with the discharge conveyor shaft 7 to reduce material transition resistance and improve conveying continuity and stability. A longitudinal lifting baffle parallel to the axis of rotation is fixedly installed on the surface of the spiral conveyor shaft 6 inside the filter cylinder 4. The air-blowing water control unit includes a dewatering cylinder 5 that is smoothly connected to the discharge end of the filter cylinder 4, a discharge conveying shaft 7 coaxially disposed inside the dewatering cylinder 5, and an air jet nozzle 8 that is inclined toward the feed inlet of the dewatering cylinder 5. The inlet end of the discharge conveyor shaft 7 inside the dewatering cylinder 5 extends into the reducer pipe and is offset from the outlet end of the screw conveyor shaft 6, positioned so as not to affect the normal operation of the screw conveyor shaft 6. The two shafts can operate independently without interfering with each other. At the bottom surface of the end of the dewatering cylinder 5 furthest from the reducer pipe, there is a downward-facing material conveying pipe that penetrates the bottom surface of the outer casing 1, used to convey the processed material to the outside of the equipment. The top of the two cavities of the outer casing 1 are respectively provided with atomizing spray assembly 3 and jet nozzle 8. The output end of the jet nozzle 8 is inclined towards the inside of the dewatering cylinder 5. A blower is provided on the top surface of the outer casing 1, which can be used to provide a stable pressure airflow for the jet nozzle 8 to ensure the working effect of air blowing dewatering.

[0021] In this embodiment, during operation, the material is fed into the bottom of the filter cylinder 4 inside the outer casing 1 through the material inlet on the side wall of the outer casing 1. At this time, the spiral conveyor shaft 6 inside the filter cylinder 4 is driven by the drive motor to rotate, and the material is slowly conveyed forward by the axial thrust of the spiral blades to overcome gravity. The longitudinal lifting baffle on the surface of the spiral conveyor shaft 6 rotates synchronously with the shaft, which can continuously lift and drop the bottom material during the material conveying process, greatly enhance the radial mixing efficiency of the material, break the layered structure of the static material layer, avoid uneven wetting caused by material accumulation, and create conditions for subsequent uniform wetting.

[0022] During material conveying, multiple parallel atomizing nozzles at the bottom of the atomizing spray assembly 3 continuously and penetratingly wet the material. Combined with the conveying and mixing effect of the spiral conveyor shaft 6, each material particle can fully contact the water, forming a uniform water film on the porous surface of the returned ore and activating its binding activity. In this process, excess water not adsorbed by the material will drip through the permeable filter screen on the surface of the filter cylinder 4 and be collected on the bottom surface of the cavity of the outer casing 1, completing solid-liquid separation.

[0023] When the material is conveyed by the screw conveyor shaft 6 to the highest discharge end of the filter cylinder 4, it falls freely into the variable diameter pipe and extends further into the dewatering cylinder 5 and the discharge conveyor shaft 7 inside the variable diameter pipe, continuing to convey it forward. At this time, the loose material being conveyed will come into full contact with the high-speed airflow output from the jet nozzle 8, and the free excess moisture attached to the surface of the particles will be removed by the shearing action of the airflow; the wastewater generated by the blowing also passes through the water-permeable filter screen on the surface of the dewatering cylinder 5 and is collected at the bottom of the cavity of the outer casing 1. When the material is conveyed to the end of the dewatering cylinder 5, it falls into the material conveying pipe under the action of gravity, and is discharged to the designated station after being guided.

[0024] Example 2: As Figure 1-8 As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, a guide channel 9 is provided at the bottom of the inner part of the outer casing 1, and a wetting water tank 2 is provided below the outer casing 1. The water outlet of the guide channel 9 is connected to the wetting water tank 2. A circulating water filter screen plate 10 is provided inside the wetting water tank 2. The water outlet of the wetting water tank 2 is connected to the atomizing spray assembly 3. A partition is provided inside the outer casing 1 to divide the internal space into two relatively independent cavities. The wetting treatment unit and the air blowing water control unit are respectively located inside the two cavities to reduce mutual interference between the two during operation. The guide channel 9 is set on the bottom surface of two cavities inside the outer shell 1. It is formed by two inclined channels connected in one piece and is set parallel to the dewatering cylinder 5 and the filter cylinder 4 respectively. The humidifying water tank 2 is set directly below the outer shell 1. The humidifying water tank 2 is set with a sedimentation chamber and a water storage chamber inside. The output end of the guide channel 9 is set inside the sedimentation chamber. The circulating water filter screen plate 10 is set at the connection between the sedimentation chamber and the water storage chamber. The bottom surface of the water storage chamber inside the humidifying water tank 2 is set with a guide plate. The outer side of the humidifying water tank 2 is set with a circulating water pump at the low position corresponding to the guide plate. The atomizing spray assembly 3 is connected to the output end of the circulating water pump. The interior of the humidifying water tank 2 is divided into a sedimentation chamber and a water storage chamber by a circulating water filter screen plate 10. The sedimentation chamber of the humidifying water tank 2 has an inspection opening on its side and the chamber is sealed by a sealing element. The bottom plate of the water storage chamber inside the humidifying water tank 2 has a funnel-shaped structure with a high periphery and a low center, which is used to guide the water flow to the designated position for the circulating water pump to draw water.

[0025] In this embodiment, before the spraying operation is started, sufficient wetting water is injected into the wetting water tank 2. Under the action of the circulating water pump and the connecting pipeline, the water is pressurized and transported to the atomizing spraying assembly 3 to provide a stable water supply for the wetting operation inside the outer casing 1.

[0026] The excess wetting water accumulated at the bottom of the outer casing 1 cavity, guided by gravity and the inclined guide channel 9, carries fine powder impurities back into the sedimentation chamber inside the wetting water tank 2. After the large particles of impurities are initially removed by gravity sedimentation, the water undergoes graded filtration through the circulating water filter screen 10, trapping dust, fine mineral powder and other impurities carried in the water. The purified wetting water enters the water storage chamber and can be pumped out again for spraying operations, realizing the recycling of water resources and reducing the consumption of new water.

[0027] The working principle of the return ore and dust removal ash pre-wetting and pelletizing mixing equipment will be explained in detail below.

[0028] like Figure 1-8As shown, the material enters the bottom of the inclined filter cylinder 4 through the inlet on the side wall of the outer shell 1. Driven by the screw conveyor shaft 6, it is slowly lifted and conveyed axially, and simultaneously continuously mixed by the longitudinal lifting baffle. During this process, the top atomizing spray assembly 3 completes saturated penetration wetting. After the material is conveyed to the high end of the filter cylinder 4, it smoothly transitions to the dewatering cylinder 5 through the reducing pipe. It is then conveyed by the discharge conveyor shaft 7 and simultaneously receives high-speed airflow from the jet nozzle 8 to remove surface free water. Finally, it is discharged to the downstream process through the bottom material conveying pipe. The excess spray water and the wastewater generated during dewatering flow into the bottom of the outer shell 1 through the permeable filter screens of the two cylinders. The water is then uniformly guided by the guide channel 9 to the sedimentation chamber of the wetting water tank 2. After gravity sedimentation and graded purification by the circulating water filter screen plate 10, it enters the water storage chamber and is then pressurized and transported back to the atomizing spray assembly 3 for reuse by the circulating water pump. The entire process realizes continuous material processing and closed-loop water resource circulation.

[0029] The inclined screw conveyor shaft 6 overcomes gravity and conveys materials by relying on the axial force generated by the screw angle. The longitudinal lifting baffle, which is set at the same time, rotates with the shaft and continuously lifts and throws the bottom material, breaking the layered state of the material layer in conventional screw conveying. This allows all material particles to be repeatedly exposed to the wetting interface. With the spray water penetrating from the outside to the inside of the filter cylinder 4, the entire surface of the particles is uniformly wetted, which fully activates the bonding activity of the porous structure of the returned ore. Then, the material is saturated with water by sufficient atomized spraying, which completely eliminates the defect of being wet on the outside and dry on the inside. Then, the high-speed shear airflow output by the jet nozzle 8 accurately removes the free excess water on the surface of the particles, leaving only the pore adsorbed water and the uniform water film on the surface. The final moisture content is stably controlled within the optimal process range, avoiding the fluctuation problems of over-wetting rebound or insufficient wetting in traditional water addition methods. Furthermore, through the permeable sidewalls of the filter cylinder 4 and the dewatering cylinder 5, excess water can be naturally filtered out by gravity throughout the material conveying process, while the material is blocked inside the cylinder for continuous conveying. Water-material separation can be completed without the need for an additional solid-liquid separation unit. The structure is compact and more efficient. Finally, relying on the inclined slope of the bottom of the outer casing 1 and the guide channel 9, the leachate is collected by gravity. After sedimentation and filtration by the screen plate to remove fine mineral powder impurities, it can be directly reused. No additional wastewater boosting power is required throughout the process, and the operation is stable with lower energy consumption.

[0030] The foregoing description is generally obvious to those skilled in the art. Therefore, any modifications or improvements made without departing from the spirit and intent of the invention are within the scope of protection of this invention.

Claims

1. A pre-wetting and pelletizing mixing device for ore return and dust removal, comprising an outer casing (1), characterized in that, The outer casing (1) is provided with a wetting treatment unit and a wind-blown water control unit in sequence along the material conveying direction; The wetting treatment unit includes an inclined filter cylinder (4), a spiral conveying shaft (6) coaxially disposed inside the filter cylinder (4), a longitudinal lifting baffle parallel to the axis of rotation of the spiral conveying shaft (6) is provided on the surface of the spiral conveying shaft (6) to continuously lift and drop the bottom material during the material conveying process, and an atomizing spray assembly (3) disposed on the top of the inner wall of the outer casing (1) with the spraying direction facing the outer wall of the filter cylinder (4). The air-blowing water control unit includes a dewatering cylinder (5) that is smoothly connected to the discharge end of the filter cylinder (4), a discharge conveying shaft (7) that is coaxially disposed inside the dewatering cylinder (5), and an air jet nozzle (8) that is inclined toward the feed inlet of the dewatering cylinder (5). The bottom of the outer casing (1) is provided with a flow guide groove (9), and a humidifying water tank (2) is provided below the outer casing (1). The water outlet of the flow guide groove (9) is connected to the humidifying water tank (2). The humidifying water tank (2) is provided with a circulating water filter screen plate (10), and the water outlet of the humidifying water tank (2) is connected to the atomizing spray assembly (3). The guide channel (9) is set on the bottom surface of two cavities inside the outer casing (1), and is formed by two inclined channels connected in one piece, and is set parallel to the dewatering cylinder (5) and the filter cylinder (4) respectively; The filter cylinder (4) and the dewatering cylinder (5) are fixedly installed inside the outer casing (1). The filter cylinder (4) and the dewatering cylinder (5) are connected by a reducing pipe. The cylinder walls of the filter cylinder (4) and the dewatering cylinder (5) are both permeable filter structures. A blower is also provided on the bottom surface of the outer casing (1). The air jet nozzle (8) is connected to the blower through a ventilation pipe. The humidifying water tank (2) is located directly below the outer casing (1). The humidifying water tank (2) has a sedimentation chamber and a water storage chamber inside. The output end of the guide channel (9) is located inside the sedimentation chamber. The circulating water filter screen plate (10) is located at the connection between the sedimentation chamber and the water storage chamber.

2. The pre-wetting and pelletizing mixing equipment for return ore and dust removal ash according to claim 1, characterized in that: The outer casing (1) is provided with a partition plate to divide the internal space into two relatively independent cavities. The wetting treatment unit and the air blowing water control unit are respectively located in the two cavities to reduce mutual interference between the two during operation.

3. The pre-wetting and pelletizing mixing equipment for return ore and dust removal ash according to claim 2, characterized in that: The dewatering cylinder (5) and the filter cylinder (4) are respectively provided with drive motors that drive the spiral conveying shaft (6) and the discharge conveying shaft (7) to rotate. The movement of the spiral conveying shaft (6) and the discharge conveying shaft (7) does not affect each other.

4. The pre-wetting and pelletizing mixing equipment for return ore and dust removal ash according to claim 3, characterized in that: The bottom end of the dewatering cylinder (5) is provided with a discharge conveying shaft (7), which is connected to the dewatering cylinder (5). The output end of the discharge conveying shaft (7) passes through the bottom surface of the outer casing (1).

5. The pre-wetting and pelletizing mixing equipment for return ore and dust removal ash according to claim 4, characterized in that: The atomizing spray assembly (3) is provided with multiple atomizing nozzles inside, which are arranged at equal intervals along the material conveying direction at the top of the inner cavity of the outer casing (1).

6. The pre-wetting and pelletizing mixing equipment for return ore and dust removal ash according to claim 5, characterized in that: The bottom surface of the water storage chamber inside the humidifying water tank (2) is provided with a guide plate, and a circulating water pump is provided on the lower part of the outer side of the humidifying water tank (2) corresponding to the guide plate. The atomizing spray assembly (3) is connected to the output end of the circulating water pump.

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