A silicon nitride manganese iron alloy raw material mixing pretreatment device

Abstract

The utility model relates to mixed pretreatment technical field discloses a kind of silicon nitride manganese iron alloy raw material mixed pretreatment devices, comprising: two crushing devices, respectively for crushing silicon iron and silicon manganese natural block into fine powder;Two material conveying channels, respectively fixedly connected in the bottom of corresponding crushing device, for transporting the fine powder after being crushed by corresponding crushing device;Primary mixing device is set in the bottom of two crushing devices, in the utility model, by setting two crushing devices respectively to silicon iron and silicon manganese natural block are crushed, array distribution's protruding block in material conveying channel is dispersed fine powder, then using the primary mixing device in 'Y' shape channel, flow guide piece and specific angle material conveying channel, make two raw material flow oblique crossing collision to break the agglomerate of silicon manganese, simultaneously by flow guide piece guiding fine powder ordered flow and mixing multiple times, avoid initial raw material accumulation, reduce subsequent stirring device's dispersion and homogenization burden.

Description

Technical Field

[0001] This utility model relates to the field of mixing pretreatment technology, and in particular to a mixing pretreatment device for silicon manganese iron nitride alloy raw materials. Background Technology

[0002] Silicon nitride ferromanganese alloy, a novel composite alloy material, is produced by crushing raw materials such as silicon manganese and ferrosilicon, mixing them thoroughly with a binder, and then pressing them into blocks and calcining them at high temperatures. It combines the high hardness, high wear resistance, good thermal stability, and oxidation resistance of silicon nitride with the important roles of ferromanganese alloys in deoxidation, desulfurization, and alloying in steelmaking, and has broad application prospects in industries such as steel, casting, and machinery manufacturing.

[0003] In existing technologies, ferrosilicon and silicon manganese are typically fed into a mixing device via a feeding pipe and mixed under the operation of the mixing device for the next preparation step. However, the inside of the feeding pipe is generally a circular channel, which only has a transport function and cannot pre-treat the raw materials. This forces the mixing device to simultaneously undertake the tasks of dispersion and homogenization. Not only do the high-hardness particles exacerbate the wear of the mixing blades, but the initial accumulation of raw materials also creates dead zones in the mixing process, reducing efficiency and increasing energy consumption. At the same time, when ferrosilicon and silicon manganese enter the mixing device through the feeding pipe, due to the density difference and agglomeration characteristics of the two materials, they are prone to stratification due to the density difference when the mixing device first starts working. The 1-3 mm agglomerates formed by the viscous oxide layer of ferrosilicon are also difficult to be dispersed by mixing in a short time, resulting in low mixing uniformity. This requires a long mixing time, which further prolongs the preparation time of ferrosilicon and silicon manganese nitride alloy, seriously reducing the preparation efficiency and making it difficult to meet the requirements of ferrosilicon and silicon manganese nitride alloy for the mixing precision and efficiency of raw materials.

[0004] Therefore, this application provides a silicon nitride manganese iron alloy raw material mixing and pretreatment device to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a mixing and pretreatment device for silicon manganese ferronitride alloy raw materials to solve the problem of low stirring efficiency of existing silicon manganese and silicon ferronitride powder materials.

[0006] To solve the problems mentioned above, this utility model is implemented through the following technical solution.

[0007] A silicon nitride manganese iron alloy raw material mixing and pretreatment device includes: Two crushing devices are used to crush ferrosilicon and ferromanganese lumps into fine powder, respectively; Two conveying channels are fixedly connected to the bottom of the corresponding crushing device, respectively, for transporting fine powder after being crushed by the corresponding crushing device; A primary mixing device is installed at the bottom of the two crushing devices, and its top is fixedly connected and communicated with the end of the two conveying channels away from the crushing devices, for the preliminary mixing of fine powder; A vertical channel is opened inside the primary mixing device, forming a "Y"-shaped channel with the two material conveying channels; Several flow guides are disposed within the vertical channel, and the flow guides include: The guide columns are all installed in the vertical channel of the "Y"-shaped channel and arranged in the vertical direction; Two flow guiding surfaces are respectively opened on both sides of the flow guiding column to guide the fine powder that comes into contact with the top of the flow guiding column.

[0008] Preferably, it further includes: Two control components are respectively located at the bottom of the two crushing devices to control the amount of fine powder entering the conveying channel from the crushing devices.

[0009] Preferably, the included angle between the two conveying channels is 45°-60°.

[0010] Preferably, it further includes: Several protrusions are respectively set at the bottom of the corresponding conveying channel and distributed in an array to disperse the fine powder attached to the bottom of the conveying channel and prevent the fine powder from agglomerating together.

[0011] Preferably, the flow guide further includes: A separator top is provided at the top of the guide column to separate fine powder that comes into contact with the top of the guide column; Several flow guide baffles are disposed on the outside of the flow guide column to further guide the orderly flow of fine powder and avoid accumulation and blockage.

[0012] Preferably, it further includes: Several material conveying channels, including two downward inclined channels on the left and right, are provided inside the primary mixing device and located on both sides of the corresponding guide column. They are configured as channels for fine powder to move downward after being guided by the guide column.

[0013] Preferably, it further includes: A stirring device is located at the bottom of the primary mixing device and is connected to the primary mixing device. It is used to stir and mix the fine powder that has undergone preliminary mixing treatment by the primary mixing device and transport it outward. A feeding pipe is located at the bottom of the mixing device and is fixedly connected to and communicates with the mixing device, used to transport the fine powder after it has been mixed by the mixing device. A pelletizing device is fixedly connected and communicates with the end of the feeding pipe away from the mixing device, and is used to agglomerate the fine powder transported to its own interior by the feeding pipe.

[0014] Preferably, it further includes: A fixed bracket is provided on one side of the crushing device, the primary mixing device, and the stirring device, for fixing the crushing device, the primary mixing device, and the stirring device at a set height; A ladder is installed on one side of the fixed support to provide a climbing path for personnel to monitor the working status of the crushing device, the primary mixing device, and the stirring device.

[0015] This invention provides a pretreatment device for mixing silicon nitride manganese iron alloy raw materials. Compared with the prior art, it has the following advantages: 1. By setting up two crushing devices to crush the natural blocks of ferrosilicon and ferromanganese respectively, and using the array of protrusions in the conveying channel to disperse the fine powder, the two raw material flows are obliquely crossed and collided in the primary mixing device through the "Y"-shaped channel, the guide component and the conveying channel with a specific angle to break the agglomerates of ferromanganese. At the same time, the guide component guides the fine powder to flow in an orderly manner and mixes it multiple times, avoiding the initial accumulation of raw materials and reducing the dispersion and homogenization burden of the subsequent stirring device. This solves the defects of the existing technology where the feeding pipe only has the function of transportation and the stirring device has to undertake the tasks of dispersion and homogenization at the same time, which leads to the agitation blade wear, the existence of stirring dead corners, low efficiency and high energy consumption.

[0016] 2. By precisely controlling the amount of ferrosilicon and ferromanganese fine powder entering the conveying channel through control components, combined with the multi-stage premixing design in the primary mixing device, the potential stratification trend of ferrosilicon and ferromanganese due to the density difference is offset in advance, the agglomerates formed by the viscous oxide layer of ferromanganese are broken, the initial mixing uniformity is improved, and the stirring time of the subsequent stirring device is reduced. This solves the defects of the existing technology in which ferrosilicon and ferromanganese are prone to stratification and agglomeration in the early stage of stirring due to the density difference and agglomeration characteristics, resulting in low mixing uniformity, long stirring time and low preparation efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of the crushing device and the primary mixing device of this utility model.

[0019] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0020] Figure 4 This is a schematic diagram of the material conveying channel and the protrusion connection structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the flow guide structure of this utility model.

[0022] The attached figures are labeled as follows: 10. Crushing device; 11. Control components; 12. Conveying channel; 13. Protrusion; 20. Primary mixing device; 201. Vertical channel; 21. Guide column; 211. Guide surface; 212. Divider top; 213. Guide baffle; 22. Conveying branch channel; 30. Mixing device; 31. Feeding pipe; 40. Pelletizing device; 50. Fixed support; 60. Ladder. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0024] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0025] Reference Figures 1-5 A silicon nitride manganese iron alloy raw material mixing and pretreatment device, comprising: Two crushing devices 10 are used to crush ferrosilicon and ferromanganese lumps into fine powder, respectively. The interior of each crushing device 10 can be coated with a 0.3-0.5 mm thick tungsten carbide layer using supersonic flame spraying technology. Tungsten carbide has a hardness of HV1800-2200 and a bonding strength with the substrate >70 MPa, which not only resists scratching from hard raw materials but also reduces the adhesion of fine powder to the surface, preventing the accumulation of fine powder from affecting the crushing effect.

[0026] The crushing device 10 can be specifically configured as a combined crushing device 10 consisting of a jaw crusher (coarse crushing), an impact crusher (medium crushing), and an air jet mill (fine crushing). The jaw crusher, located at the top, crushes ferrosilicon and ferromanganese lumps into coarse particles of 50-100mm. Then, the impact crusher, located in the middle, further crushes the coarsely crushed 50-100mm particles into fine particles of 5-10mm. Finally, the high-pressure airflow from the air jet mill at the bottom drives the ferrosilicon and ferromanganese particles to collide and rub at high speed within the crushing chamber, achieving ultra-fine crushing. Its crushing precision can be stably controlled below 200 mesh (74μm), and the product particle size distribution is narrow with no mechanical wear contamination.

[0027] Alternatively, the crushing device 10 can be specifically configured as a combined crushing device 10 consisting of a roller crusher (medium crushing) and a vibrating mill (fine crushing). The roller crusher uses two opposing rotating rollers to squeeze and shear the material, crushing the blocky raw material into 10-20mm particles. Then, the grinding media of the vibrating mill impacts and grinds the material under high-frequency vibration, which can refine the 10-20mm particles to 200 mesh.

[0028] Two conveying channels 12 are fixedly connected to the bottom of the corresponding crushing device 10 and are used to transport the fine powder after being crushed by the corresponding crushing device 10. The inner wall of the conveying channel 12 can be treated with a ceramic composite coating with a thickness of 0.1-0.2 mm, a smooth surface and hydrophobicity. This treatment can reduce the adhesion of silicon manganese fine powder, reduce the cleaning frequency, and at the same time, the ceramic material is resistant to oxidation, acid and alkali, and can resist corrosion that may be caused by impurities in the raw materials.

[0029] The primary mixing device 20 is located at the bottom of the two crushing devices 10, and its top is fixedly connected and communicated with the end of the two conveying channels 12 away from the crushing devices 10. It is used for the preliminary mixing of fine powder. The vertical channel 201 is located inside the primary mixing device 20 and forms a "Y"-shaped channel with the two material conveying channels 12; Several flow guides are disposed within the vertical channel 201. These flow guides can be made of polytetrafluoroethylene (PTFE), a typical "low surface energy material" in industrial applications, with a surface tension of only about 18 mN / m. Fine ferrosilicon and ferromanganese powders are unlikely to form stable adhesions on its surface, thus preventing powder accumulation and blockage of the flow channel at the source and ensuring smooth guidance. Simultaneously, its extremely low coefficient of friction significantly reduces the frictional resistance between the fine powder and the flow guide surface 211 and the flow guide baffle 213, allowing the fine powder to flow smoothly along a preset trajectory and reducing guiding deviations caused by frictional retention. The flow guides include: The guide columns 21 are all located at the bottom vertical end of the "Y"-shaped channel and are arranged in the vertical direction; Two guide surfaces 211 are respectively formed on both sides of the guide column 21 to guide the fine powder that contacts the top of the guide column 21. The guide surfaces 211 can be precision polished to control the surface roughness to Ra≤0.8μm, forming a mirror-like smooth surface. This treatment can significantly reduce the friction coefficient between the fine powder and the guide surfaces 211, reduce the resistance and retention of the fine powder during the flow process, and make the movement of the fine powder along the guide surfaces 211 more closely follow the preset trajectory, avoiding local eddies or accumulation caused by surface roughness, and ensuring the stability of the guiding path. At the same time, the smooth surface can reduce the adhesion and residue of fine powder, reducing the impact of surface fouling on guiding accuracy after long-term use.

[0030] Also includes: Two control components 11 are respectively located at the bottom of the two crushing devices 10, and are used to control the amount of fine powder entering the conveying channel 12 from the crushing device 10.

[0031] The included angle between the two conveying channels 12 is 45°-60°. If the included angle between the two conveying channels 12 is too small, the two raw material flows will converge gently, resulting in a low relative collision speed and insufficient impact force. This will not only fail to break up the 1-3mm agglomerates of ferrosilicon and manganese, but also make it difficult to counteract the stratification trend caused by the density difference. Local enrichment of ferrosilicon / manganese will still exist after premixing. If the included angle is too large, the two raw material flows will collide head-on. Although the impact force is strong, it is easy to cause separation and rebound due to the density difference. That is, ferrosilicon, due to its high density, will impact downwards directly, while ferrosilicon, due to its low density, will splash to both sides, which will aggravate particle segregation. Furthermore, sharp ferrosilicon particles are prone to impacting the channel wall and causing wear. An included angle of 45°-60° allows the two raw material flows to form an oblique cross collision. The impact force can be evenly decomposed into radial dispersion force and axial guiding force. The former breaks up the agglomerates, allowing ferrosilicon and manganese particles to interpenetrate microscopically. The latter guides the mixed particles to flow downwards along the vertical end of the channel, laying the foundation for secondary dispersion by the subsequent guide components.

[0032] Also includes: Several protrusions 13 are respectively disposed at the bottom of the corresponding conveying channels 12 and distributed in an array to disperse the fine powder adhering to the bottom of the conveying channels 12 and prevent the fine powder from agglomerating together. During the conveying process, due to factors such as intermolecular forces and electrostatic forces, fine silicon manganese and silicon iron powders tend to adhere to the bottom of the conveying channels 12 and agglomerate to form lumps or clusters. The presence of protrusions 13 changes the surface morphology of the bottom of the conveying channels 12. When the fine powder passes through the protrusions 13, the protrusions 13 will mechanically disturb and obstruct the fine powder, breaking the agglomeration balance between the fine powders and dispersing the agglomerated fine powder into smaller particles or individual particles, thereby achieving the dispersion of fine powder.

[0033] The flow guide also includes: The separator top 212 is set on the top of the guide column 21 to separate the fine powder that comes into contact with the top of the guide column 21. The presence of the separator top 212 ensures that when the fine powder comes into contact with the top of the guide column 21, it will first be separated by the separator top 212 set on the top of the guide column 21, avoiding a large amount of fine powder from accumulating on the top of the guide column 21. Then, the fine powder flows in different directions under the guidance of the guide surface 211 and enters the corresponding material conveying channel 22.

[0034] Several flow guide baffles 213 are all set on the outside of the flow guide column 21 to further guide the orderly flow of fine powder and avoid accumulation and blockage.

[0035] The entire flow guide can be made of polytetrafluoroethylene (PTFE), which has extremely low surface energy, making it difficult for fine ferrosilicon and ferromanganese powders to form stable adhesions on its surface, thus reducing the accumulation of fine powders at the source. Simultaneously, it exhibits excellent high and low temperature resistance, adapting to possible temperature fluctuations within the pretreatment unit; it also possesses strong chemical stability, preventing chemical reactions with fine ferrosilicon and ferromanganese powders and avoiding material contamination of raw materials. Alternatively, a wear-resistant ceramic-coated composite metal can be used, with stainless steel as the base and an alumina ceramic coating on the surface, ensuring the structural strength of the flow guide; the alumina ceramic coating resists wear from fine powders, preventing the surface of the flow guide from becoming rough due to wear.

[0036] Also includes: Several material conveying channels 22, including two downward inclined channels on the left and right, are opened inside the primary mixing device 20 and located on both sides of the corresponding guide column 21. They are configured as channels for fine powder to move downward after being guided by the guide column 21.

[0037] Also includes: A stirring device 30 is located at the bottom of the stirring device 30. The stirring device 30 is connected to the primary mixing device 20 and is used to stir and mix the fine powder that has undergone preliminary mixing treatment by the primary mixing device 20 and transport it outward. The feeding pipe 31 is located at the bottom of the mixing device 30 and is fixedly connected to and communicates with the mixing device 30, and is used to transport the fine powder after being mixed by the mixing device 30. The pelletizing device 40 is fixedly connected to and communicates with the end of the feeding pipe 31 away from the mixing device 30, and is used to agglomerate the fine powder transported to its interior by the feeding pipe 31. The pelletizing device 40 can be an inclined drum pelletizer, in which the cylindrical drum is arranged at an incline. The rotation of the drum causes the powder inside to continuously roll and agglomerate under the action of friction, centrifugal force, and gravity, gradually forming pellets. This type of equipment has a simple structure, and the pellet forming process is continuous and stable, suitable for the pelletizing needs of fine powders mixed with ferrosilicon and ferromanganese. The pellet particle size can be controlled by adjusting the drum speed and inclination angle.

[0038] Also includes: A fixed bracket 50 is provided on one side of the crushing device 10, the primary mixing device 20, and the stirring device 30, and is used to fix the crushing device 10, the primary mixing device 20, and the stirring device 30 at a set height; A ladder 60, installed on one side of the fixed support 50, provides a climbing path for personnel to monitor the working status of the crushing device 10, the primary mixing device 20, and the mixing device 30. The ladder 60 can also be a hydraulically driven mobile lifting platform, specifically installed on one side of the fixed support 50. It requires no fixed installation, is highly flexible, and can be moved manually or electrically to the side of the equipment to be monitored. Workers stand on the platform and adjust the height using the lifting control system to meet the maintenance needs of equipment at different heights.

[0039] Working process and principle: First, two crushing devices 10 crush the natural lumps of ferrosilicon and ferromanganese respectively, processing them into fine powder. Then, two control components 11 control the amount of crushed ferrosilicon fine powder and ferromanganese fine powder entering the corresponding conveying channels 12. The protrusions 13 in the conveying channels 12 will mechanically disturb the fine powder attached to the bottom of the channel, breaking the fine powder aggregation balance. At the same time, the two conveying channels 12 are set at an angle of 45°-60°, so that the two raw material flows form an oblique cross collision, which not only breaks the 1-3mm agglomerates of ferromanganese, but also guides the mixed particles to flow downward. Next, the fine powder enters the primary mixing device 20 through the conveying channel 12. The partition top 212 of the guide column 21 in the "Y"-shaped channel first separates the contacting fine powder to prevent accumulation. The guide surfaces 211 on both sides guide the flow of fine powder, and the outer guide baffle 213 further guides the fine powder to flow in an orderly manner. Then, the fine powder enters the conveying branch channels 22 on both sides of the corresponding guide column 21, moves downward, collides again, and contacts the guide column 21 again, repeating the above mixing process. After repeating multiple times, the fine powder that has completed the preliminary mixing enters the stirring device 30 connected to the bottom of the primary mixing device 20. The stirring device 30 further stirs and mixes the fine powder. The uniformly mixed fine powder is transported to the pelletizing device 40 through the feeding pipe 31 connected to the bottom of the stirring device 30. The pelletizing device 40 agglomerates the fine powder into pellets. Throughout the process, the fixed support 50 fixes the crushing device 10, the primary mixing device 20, and the stirring device 30 at a set height. Workers can climb up the ladder 60 on one side of the fixed support 50 to monitor the working status of each device.

[0040] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A pretreatment device for mixing silicon manganese ferronitride alloy raw materials, characterized in that, include: Two crushing devices (10) are used to crush ferrosilicon and ferromanganese lumps into fine powder, respectively; Two conveying channels (12) are fixedly connected to the bottom of the corresponding crushing device (10) respectively, and are used to transport fine powder after being crushed by the corresponding crushing device (10); The initial mixing device (20) is located at the bottom of the two crushing devices (10), and its top is fixedly connected and communicated with the end of the two conveying channels (12) away from the crushing devices (10), and is used for the initial mixing of fine powder; A vertical channel (201) is opened inside the primary mixing device (20) and forms a "Y"-shaped channel with the two material conveying channels (12); Several flow guides are disposed within the vertical channel (201), and the flow guides include: The guide columns (21) are all set in the vertical channel (201) of the "Y"-shaped channel and arranged in the vertical direction; Two guide surfaces (211) are respectively opened on both sides of the guide column (21) to guide the fine powder that comes into contact with the top of the guide column (21).

2. The silicon-manganese-iron alloy raw material mixing and pretreatment device according to claim 1, characterized in that, Also includes: Two control components (11) are respectively located at the bottom of the two crushing devices (10) for controlling the amount of fine powder entering the conveying channel (12) from the crushing device (10).

3. The silicon-manganese alloy raw material mixing and pretreatment device according to claim 1, characterized in that, The included angle between the two conveying channels (12) is 45°-60°.

4. The silicon-manganese alloy raw material mixing and pretreatment device according to claim 1, characterized in that, Also includes: Several protrusions (13) are respectively set at the bottom of the corresponding conveying channel (12) and distributed in an array to disperse the fine powder attached to the bottom of the conveying channel (12) and prevent the fine powder from agglomerating together.

5. The silicon-manganese alloy raw material mixing and pretreatment device according to claim 1, characterized in that, The flow guide also includes: A separator top (212) is provided on the top of the guide column (21) to separate fine powder that is in contact with the top of the guide column (21); Several flow guide baffles (213) are all disposed on the outside of the flow guide column (21) to further guide the fine powder to flow in an orderly manner and avoid accumulation and blockage.

6. The silicon manganese ferronitride alloy raw material mixing and pretreatment device according to claim 1, characterized in that, Also includes: Several material conveying channels (22) include two downward inclined channels on the left and right. The material conveying channels (22) are all opened inside the primary mixing device (20) and located on both sides of the corresponding guide column (21). They are configured as channels for fine powder to move downward after being guided by the guide column (21).

7. The silicon-manganese alloy raw material mixing and pretreatment device according to claim 1, characterized in that, Also includes: A stirring device (30) is provided at the bottom of the primary mixing device (20). The stirring device (30) is connected to the primary mixing device (20) and is used to stir and mix the fine powder that has undergone preliminary mixing treatment by the primary mixing device (20) and transport it outward. The feeding pipe (31) is located at the bottom of the stirring device (30) and is fixedly connected to and communicates with the stirring device (30) for transporting fine powder after being stirred and mixed by the stirring device (30). The pelletizing device (40) is fixedly connected and communicates with the end of the feeding pipe (31) away from the stirring device (30), and is used to agglomerate the fine powder transported to its own interior by the feeding pipe (31).

8. The silicon-manganese alloy raw material mixing and pretreatment device according to claim 7, characterized in that, Also includes: A fixed bracket (50) is provided on one side of the crushing device (10), the primary mixing device (20), and the stirring device (30) to fix the crushing device (10), the primary mixing device (20), and the stirring device (30) at a set height; A ladder (60) is provided on one side of the fixed support (50) to provide a climbing path for personnel to monitor the working status of the crushing device (10), the primary mixing device (20), and the stirring device (30).

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