Ring and plate cylindrical mixer apparatus and method of production thereof

Abstract

The present application relates to steel metallurgical sintering mixing uniform granulation technical field, disclose a kind of ring plate cylindrical mixer device, including cylinder body, the outside of cylinder body is equipped with the cylinder body driving system of driving cylinder body rotation, cylinder body is horizontal, and feed end is higher than discharge end, the inner wall of cylinder body is equipped with the annular intercepting plate group that sintering raw material is intercepted, further including the cyclonic intercepting system that sintering raw material is thrown to incoming material direction.This application further discloses a kind of production method of ring plate cylindrical mixer device.The ring plate cylindrical mixer device of the present application and its production method, without lengthening the mixing machine, effectively prolongs the granulation time of overall mixture, and selectively prolongs the granulation time of fine particle mixture, solves the problem that the length of secondary mixing machine is limited, causes the mixing material granulation effect to be poor.

Description

Technical Field

[0001] This invention relates to the field of sintering, mixing, and granulation technology in iron and steel metallurgy, specifically to a cylindrical mixer with a ring plate and its production method. Background Technology

[0002] The sintering process typically includes: receiving and storing iron-bearing raw materials, fuel, and flux; crushing and screening fuel and flux; batching, mixing and granulation of sintering materials; feeding, ignition and ventilated sintering; and crushing, screening, cooling, and granulation of the sinter. Granulation is a crucial step in the entire sintering process for iron ore. Granulation yields a mixture with sufficient mechanical strength, uniform particle size distribution, and minimal chemical segregation, improving furnace permeability, enhancing roasting effects, and ensuring maximum desulfurization, thus producing sinter with excellent metallurgical properties.

[0003] Meanwhile, the granulation process also improves the heat distribution during sintering, reducing energy consumption. The permeability directly affects the efficiency and effectiveness of the sintering process. Through granulation, the permeability of the material layer is significantly improved, thereby increasing the vertical sintering speed and improving the strength of the sinter. This improvement not only significantly enhances sintering efficiency but is also a key guarantee for achieving thick-layer sintering, ensuring the efficient and stable operation of the sintering process.

[0004] To increase production through enhanced granulation, sintering plants both domestically and internationally have modified their two-stage cylindrical mixing granulation process to a three-stage (one-stage high-intensity mixer, two and three-stage cylindrical mixers) or four-stage (one-stage cylindrical mixer, two-stage high-intensity mixer, three and four-stage cylindrical mixers) mixing granulation process. This extends the granulation time of the mixture, effectively enhancing raw material granulation and improving sintered ore quality indicators. However, this approach is not suitable for older sintering machines with compact layouts and limited space. While overhauling older sintering machines to expand the trolley area and increase side panel height can increase feed rate and sintering capacity, modifications to sintering granulation equipment are difficult to implement due to site constraints. This results in poorer sintering mixing and granulation effects, excessively high fan negative pressure, increased air leakage in the sintering machine, and insufficient effective airflow to the material surface, affecting ventilation, heat transfer, and combustion efficiency. This deteriorates important economic and technical indicators such as utilization coefficient, drum strength, and yield, further hindering the reduction of molten iron costs. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing a cylindrical mixer device with a ring plate and its production method, which effectively extends the overall granulation time of the mixture and selectively extends the granulation time of the fine-particle mixture without lengthening the mixer, thus solving the problem of poor granulation effect caused by the limited length of the secondary mixer.

[0006] To achieve the above objectives, the present invention relates to a cylindrical mixer with annular plates, comprising a cylindrical body, an external cylindrical body drive system for driving the cylindrical body to rotate, the cylindrical body being horizontal with the feed end higher than the discharge end, an annular intercepting plate assembly for intercepting sintering raw materials on the inner wall of the cylindrical body, and a swirling intercepting system for intercepting and throwing sintering raw materials toward the incoming material direction.

[0007] Preferably, the annular baffle assembly includes a plurality of annular baffles, which are arranged perpendicularly at 90° to the circumference of the inner wall of the cylindrical body.

[0008] Preferably, the distance between two adjacent annular interceptor plates is 2000-4000 mm.

[0009] Preferably, the height of the annular baffle plate is 200-600 mm, and the height gradually increases from the feed end to the discharge end.

[0010] Preferably, the cross-sectional shape of the annular interceptor is "|" and / or inverted "V".

[0011] Preferably, the swirling flow-blocking system includes a support extending through both ends of the cylinder body. One end of the support is rotatably mounted on a support base, and the other end is connected to a swirling drive system that drives its rotation. Several swirling flow-blocking groups are evenly arranged on the support. Each swirling flow-blocking group includes several horizontal swirling flow-blocking devices and a vertical transmission rod. The vertical transmission rod is mounted on the support. The swirling flow-blocking devices are evenly distributed around the vertical transmission rod, with one end mounted on the lower end of the vertical transmission rod and the other end provided with a flow-blocking plate. The vertical transmission rod converts the rotation of the support into the rotation of the swirling flow-blocking devices about the vertical transmission rod as an axis.

[0012] Preferably, the distance between the flow-cutting plate and the inner wall of the cylinder body is 10-80mm, and the height of the swirling flow-cutting device is 50-300mm lower than the top of the swirling zone inside the cylinder body.

[0013] Preferably, when the swirling flow-cutting device rotates, it pushes the sintering raw material towards the feed end through the flow-cutting plate.

[0014] A production method for a cylindrical mixer with a ring plate: the sintering raw material enters through the feed end of the cylinder body, rises first as the cylinder body rotates, and then rolls and falls while moving towards the discharge end. During this process, water is added to wet the sintering raw material.

[0015] As the sintering raw material rolls forward toward the discharge end, when it reaches the annular baffle in the annular baffle group, the large particles of material that have been granulated are thrown off and overturned over the annular baffle, while the small particles remain in front of the annular baffle and continue the granulation process as the cylinder body rotates until they grow larger and are thrown off and overturned over the annular baffle to move forward.

[0016] As the cylinder body rotates, the sintering raw materials are repeatedly lifted. The large particles of granulated material tumble and fall under the action of gravity and the supporting force of the cylinder body, while the small particles continue to be lifted upwards to the return rolling zone under the driving force of the rotating cylinder body.

[0017] When the cyclone interception system rotates through the roll zone, the interception plate of the cyclone interception system intercepts the material in the roll zone and continues to rotate. Under the action of centrifugal force, the material is thrown in the direction of incoming material. Some small particles are thrown forward to the lifting zone, and other small particles are thrown forward to the other side of the mixer cylinder wall to roll and merge into the initial lifting zone.

[0018] With the combined action of the annular baffle and the baffle plate, the granulation time of the sintering raw materials is extended, especially the granulation time of small particles. Finally, after the sintering raw materials are granulated, they are formed into spherical particles and discharged from the discharge end.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. By setting annular baffles at intervals inside the mixer, the trend of the material flow gradually becoming thinner during the axial mixing process of the mixer was successfully reversed, and the material flow cross-sectional occupancy rate and the uniformity of axial material flow filling rate were significantly improved.

[0021] 2. By setting annular baffles at intervals inside the mixer, the granulation time of small particles in the lower part of the material flow is effectively extended, resulting in a more uniform and efficient mixing and granulation effect.

[0022] 3. By setting up a swirling interceptor in the mixer to intercept the material in the upper rolling zone of the material flow and scatter it forward, part of the fine particle mixture is thrown forward to the material flow lifting zone, and another part of the fine particle mixture is thrown forward to the other side of the mixer cylinder wall to roll and merge into the initial lifting zone. The fine particle mixture is optimized, the granulation time is extended in a targeted manner, and the mixing effect is significantly improved.

[0023] 4. Without extending the mixer, the overall granulation time of the mixture is effectively extended. This effectively solves the problem that after the old sintering machine is modified, the sintering capacity and feeding amount are increased, but the secondary mixer cannot be extended or its length is limited due to the compact layout and limited space, resulting in a poor granulation effect of the mixture. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the cylindrical mixer device with ring plate of the present invention;

[0025] Figure 2 This is a cross-sectional view of the inside of the cylinder body.

[0026] The components in the diagram are labeled as follows:

[0027] 1. Cylinder body; 2. Cylinder body drive system; 3. Feed end; 4. Discharge end; 5. Annular cutoff plate group; 6. Swirling cutoff system; 7. Annular cutoff plate; 8. Support bracket; 9. Swirling drive system; 10. Swirling cutoff group; 11. Swirling cutoff device; 12. Vertical transmission rod; 13. Cutoff plate; 14. Rolling area; 15. Lifting area; 16. Initial lifting area; 17. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0029] Example 1

[0030] like Figure 1 As shown, a cylindrical mixer with annular plates includes a cylindrical body 1. In this embodiment, the cylindrical body 1 has a diameter of 4m and a length of 18m. The cylindrical body 1 is provided with a cylindrical body drive system 2 to drive the cylindrical body 1 to rotate. The cylindrical body 1 is horizontal, and the feed end 3 is higher than the discharge end 4. The inner wall of the cylindrical body 1 is provided with an annular intercepting plate group 5 to intercept the sintering raw materials. It also includes a swirling intercepting system 6 to intercept the sintering raw materials and throw them in the direction of incoming material.

[0031] In this embodiment, the annular baffle assembly 5 includes 5 annular baffles 7. The annular baffles 7 are arranged vertically at 90° along the circumferential direction of the inner wall of the cylinder body 1. The distance between two adjacent annular baffles 7 is 2000-4000mm, and in this embodiment it is 3000mm.

[0032] In addition, the height of the annular baffle 7 is 200-600mm, and the height gradually increases from the feed end 3 to the discharge end 4. In this embodiment, the heights of the five annular baffles 7 from the feed end 3 to the discharge end 4 are 240mm, 260mm, 280mm, 300mm and 320mm respectively. The cross-sectional shape of the annular baffle 7 is "|" and / or inverted "V" shape. In this embodiment, it is "|" shape.

[0033] Combination Figure 2As shown, the swirling flow-blocking system 6 includes a support 8 that passes through both ends of the cylindrical body 1. One end of the support 8 is rotatably mounted on a support base 9, and the other end is connected to a swirling drive system 10 that drives its rotation. Several swirling flow-blocking groups 11 are evenly arranged on the support 8. Each swirling flow-blocking group 11 includes several horizontal swirling flow-blocking devices 12 and a vertical transmission rod 13. In this embodiment, three horizontal swirling flow-blocking devices 12 are included. The vertical transmission rod 13 is mounted on the support 8. The swirling flow-blocking devices 12 are evenly distributed around the vertical transmission rod 13. One end is mounted on the lower end of the vertical transmission rod 13, and the other end is provided with a flow-blocking plate 14. The vertical transmission rod 13 converts the rotation of the support 8 into the rotation of the swirling flow-blocking devices 12 around the vertical transmission rod 13.

[0034] The distance between the flow interceptor 14 and the inner wall of the cylinder body 1 is 10-80mm, and 20mm in this embodiment. The height of the swirling flow interceptor 12 is 50-300mm lower than the top of the inner swirling area 15 of the cylinder body 1, and 100mm in this embodiment.

[0035] When the cyclone throttling device 12 rotates, it pushes the sintering raw material towards the feed end 3 through the throttling plate 14. Figure 2 For example, Figure 2 The diagram shows a cross-section of the cylinder body 1, viewed from the discharge end 4 towards the feed end 3. The cylinder body 1 rotates clockwise from this perspective. At this time, the material flow formed by the sintering raw material is higher on the left. The rotation direction of the cyclone intercepting device 12 is clockwise from the top view. The intercepting plate 14 will push the sintering raw material inward, that is, towards the feed end 3. When the rotation direction of the cylinder body 1 changes, the rotation direction of the cyclone intercepting device 12 also changes at the same time, ensuring that the intercepting plate 14 pushes the sintering raw material towards the feed end 3.

[0036] In addition, in this embodiment, the annular interceptor plate 7 and the swirling interceptor device 12 are staggered to avoid interference.

[0037] In this embodiment, the sintering raw material enters through the feed end 3 of the cylinder body 1, and rises first as the cylinder body 1 rotates, then rolls and falls while moving towards the discharge end 4. During this process, water is added to wet the sintering raw material.

[0038] As the sintering raw material rolls forward toward the discharge end 4, when it reaches the annular baffle 7 in the annular baffle group 5, the large particles of material that have been granulated are thrown off and overturned over the annular baffle 7, while the small particles remain in front of the annular baffle 7 and continue the granulation process as the cylinder body 1 rotates until they grow larger and are thrown off and overturned over the annular baffle 7 to move forward.

[0039] As the cylinder body 1 rotates, the sintering raw materials are repeatedly lifted. The large particles of granulated material tumble and fall under the action of gravity and the supporting force of the cylinder body 1, while the small particles continue to be lifted upwards to the return rolling zone 15 under the drive of the rotating cylinder body 1.

[0040] When the cyclone intercepting system 6 rotates through the rolling zone 15, the intercepting plate 14 of the cyclone intercepting system 6 intercepts the material in the rolling zone 15 and continues to rotate. Under the action of centrifugal force, the material is thrown towards the incoming material direction. A portion of the small particles are thrown forward to the lifting zone 16, and another portion of the small particles are thrown forward to the other side of the mixer cylinder wall to roll and merge into the initial lifting zone 17.

[0041] Under the combined action of the annular baffle 7 and the baffle 14, the granulation time of the sintering raw material is extended, especially the granulation time of small particles. Finally, after the sintering raw material is granulated, it forms spherical particles and is discharged from the discharge end 4.

[0042] Comparative Example 1

[0043] The following is a conventional cylindrical pelleting production method:

[0044] The sintering raw materials enter through the feed end of the cylinder body, rise first as the cylinder body rotates, and then roll and fall while moving towards the discharge end. Water is added during this process. The wetted materials collide and are squeezed together under the action of the cylinder body rotation, gradually growing into spherical particles and being discharged from the discharge end.

[0045] The particle size and granulation index (GI) of the mixture after granulation in Example 1 -0.25 The comparison of sintering indices with those of conventional cylindrical granulation is shown in Tables 1 and 2.

[0046] Table 1 Particle size distribution of the mixture

[0047]

[0048]

[0049] Table 2 Comparison of Sintering Indicators

[0050]

[0051] Granulation Index

[0052] Chinese: A -0.25 The percentage of the -0.25mm portion in the pre-granulation mixture, in %.

[0053] B -0.25 The percentage of the -0.25mm portion in the granulated mixture, in %.

[0054] As shown in Table 1, the granulation index (GI) of the mixture after granulation in Example 1 is [missing information]. -0.25 The granulation efficiency of Example 1 is 20.8% higher than that of a conventional cylindrical mixer, indicating that the granulation effect is better. As shown in Table 2, the sintering mixture prepared in Example 1 exhibits higher vertical sintering speed, utilization coefficient, yield, and drum strength after sintering compared to a conventional cylindrical mixer. This is mainly because the extended granulation time in Example 1 significantly reduces the number of fine particles, resulting in a more uniform particle size distribution in the mixture, improved permeability of the sintering layer, and accelerated sintering speed. Simultaneously, the resulting sintering mixture has a denser particle structure, reducing the thin-walled, large-pore structure within the sinter during sintering, leading to a denser internal structure and thus forming a stronger sinter.

[0055] This invention relates to a cylindrical mixer with annular plates and its production method. By periodically installing annular baffles 7 within the mixer, the trend of the material flow gradually thinning during axial mixing is successfully reversed, significantly improving the cross-sectional area occupancy and uniformity of axial material flow filling. The periodic installation of the annular baffles 7 effectively extends the granulation time of small particles in the lower part of the material flow, achieving a more uniform and efficient mixing and granulation effect. Furthermore, by installing a swirling baffle device 12 within the mixer to intercept the material in the upper rolling zone 15 of the material flow and rotate it forward to scatter it, a portion of the fine particles are mixed... The mixed material is thrown forward to the material flow lifting zone 16, while another part of the fine mixed material is thrown forward to roll on the other side of the mixer cylinder wall and merge into the initial lifting zone 17. The fine mixed material is optimized, and the granulation time is extended in a targeted manner to ensure a significant improvement in the mixing effect. Without lengthening the mixer, the overall granulation time of the mixed material is effectively extended. This effectively solves the problem that after the old sintering machine is modified, the sintering capacity is increased and the feeding amount is increased, but the secondary mixer cannot be lengthened or its length is limited due to the compact layout and limited space, resulting in a poor granulation effect of the mixed material.

[0056] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0057] The aspects disclosed in this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the foregoing description, detailed descriptions of relevant known functions or configurations have been omitted where it would unnecessarily obscure the focus of this specification and claims.

[0058] Finally, it should be noted that the above description is a further detailed explanation of the invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, any simple substitutions made without departing from the concept of the invention should be considered within the scope of protection of this invention. The above embodiments are merely representative examples of the invention. Obviously, the invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the invention should be considered within the scope of protection of this invention.

Claims

1. A cylindrical mixer device with a ring plate, comprising a cylindrical body (1), characterized in that: The cylinder body (1) is provided with a cylinder body drive system (2) for driving the cylinder body (1) to rotate. The cylinder body (1) is horizontal and the feed end (3) is higher than the discharge end (4). The inner wall of the cylinder body (1) is provided with an annular interceptor plate group (5) for intercepting the sintering raw materials. It also includes a swirling interceptor system (6) for intercepting the sintering raw materials and throwing them in the direction of incoming material. The annular interceptor plate group (5) includes several annular interceptor plates (7). The annular interceptor plates (7) are arranged vertically at 90º along the circumferential direction of the inner wall of the cylinder body (1). The swirling flow-blocking system (6) includes a bracket (8) extending through both ends of the cylindrical body (1). One end of the bracket (8) is rotatably mounted on a support base (9), and the other end is connected to a swirling drive system (10) that drives its rotation. Several swirling flow-blocking groups (11) are evenly arranged on the bracket (8). Each swirling flow-blocking group (11) includes several horizontal swirling flow-blocking devices (12) and a vertical transmission rod (13). The vertical transmission rod (13) is mounted on the bracket (8). The swirling flow interceptor (12) is evenly distributed around the vertical transmission rod (13). One end is installed at the lower end of the vertical transmission rod (13), and the other end is provided with a flow interceptor (14). The vertical transmission rod (13) converts the rotation of the support (8) into the rotation of the swirling flow interceptor (12) around the vertical transmission rod (13). When the swirling flow interceptor (12) rotates, it pushes the sintering raw material to the feed end (3) through the flow interceptor (14).

2. The cylindrical mixer with ring plate as described in claim 1, characterized in that: The distance between two adjacent annular interceptor plates (7) is 2000-4000 mm.

3. The cylindrical mixer with ring plate as described in claim 1, characterized in that: The height of the annular baffle (7) is 200-600 mm, and the height gradually increases from the feed end (3) to the discharge end (4).

4. The cylindrical mixer with ring plate as described in claim 1, characterized in that: The cross-sectional shape of the annular cutoff plate (7) is "|" and / or inverted "V".

5. The cylindrical mixer with ring plate as described in claim 1, characterized in that: The distance between the flow cut-off plate (14) and the inner wall of the cylinder body (1) is 10-80mm, and the height of the swirling flow cut-off device (12) is 50-300mm lower than the top of the inner swirling area (15) of the cylinder body (1).

6. A production method for the cylindrical mixer with ring plate as described in claim 1, characterized in that: The sintering raw material enters through the feed end (3) of the cylinder body (1), and rises first as the cylinder body (1) rotates, and then rolls and falls while moving towards the discharge end (4). During this process, water is added to wet the sintering raw material. As the sintering raw material rolls forward toward the discharge end (4), when it reaches the annular baffle (7) in the annular baffle group (5), the large particles of material that have been granulated are thrown off and flipped over the annular baffle (7), while the small particles remain in front of the annular baffle (7) and continue the granulation process as the cylinder body (1) rotates until they grow larger and are thrown off and flipped over the annular baffle (7) to move forward. As the cylinder body (1) rotates, the sintering raw materials are repeatedly lifted. The large particles of granulated material tumble and fall under the action of gravity and the supporting force of the cylinder body (1), while the small particles continue to be lifted upwards to the return rolling zone (15) under the drive of the rotating cylinder body (1). When the swirling interception system (6) rotates through the rolling zone (15), the intercepting plate (14) of the swirling interception system (6) intercepts the material in the rolling zone (15) and continues to rotate. Under the action of centrifugal force, the material is thrown towards the incoming material direction. A portion of the small particles are thrown forward to the lifting zone (16), and another portion of the small particles are thrown forward to the other side of the mixer cylinder wall to roll and merge into the initial lifting zone (17). Under the combined action of the annular baffle (7) and the baffle (14), the granulation time of the sintering raw material is extended, especially the granulation time of small particles. Finally, after the sintering raw material is granulated, it forms spherical particles and is discharged from the discharge end (4).

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