Cylindrical mixer device with annular plate and production method thereof

Abstract

The invention relates to the technical field of ferrous metallurgy sintering mixing granulation, and discloses a cylinder type mixer device with an annular plate, which comprises a cylinder body, the outside of the cylinder body is provided with a cylinder body driving system for driving the cylinder body to rotate, the cylinder body is horizontal, and the feed end is higher than the discharge end. An annular intercepting plate group for intercepting sintering raw materials is arranged on the inner wall of the cylinder body, and the rotary intercepting system is used for intercepting the sintering raw materials and throwing the sintering raw materials towards a feeding direction. The invention further discloses a production method of the cylindrical mixer device with the annular plates. According to the cylindrical mixer device with the annular plate and the production method of the cylindrical mixer device, under the condition that the mixer is not lengthened, the whole mixture granulation time is effectively prolonged, the fine-grain mixture granulation time is selectively prolonged, and the problem that the mixture granulation effect becomes poor due to the fact that the length of a secondary mixer is limited is solved.

Description

Technical Field

[0001] The invention relates to the technical field of sintering, mixing and granulating of iron and steel metallurgy, and in particular to a cylindrical mixer device with an annular plate and a production method thereof. Background Art

[0002] The sintering process usually includes: receiving and storing iron-containing raw materials, fuels and fluxes, crushing and screening of fuels and fluxes, batching of sintering materials, mixed granulation, material distribution, ignition and ventilation sintering, crushing, screening, cooling and granulation of sintered ore. In the whole sintering process, granulation is a very important link in iron ore sintering. Through granulation, a mixture with certain mechanical strength, uniform particle size distribution and small chemical composition segregation can be obtained, which can improve the permeability of the charge, strengthen the roasting effect, ensure maximum desulfurization, and thus obtain sintered ore with good metallurgical properties.

[0003] At the same time, the granulation process can also improve the heat distribution of the sintering process and reduce energy consumption. The quality of air permeability is directly related to the efficiency and effect of the sintering process. Through granulation, the air permeability of the material layer is significantly improved, thereby increasing the vertical sintering speed of the sintering material and improving the strength of the sintered ore. This improvement not only significantly improves the sintering efficiency, but is also the key guarantee for the realization of the thick material layer sintering process, ensuring the efficient and stable sintering process.

[0004] In order to achieve the purpose of increasing production by strengthening granulation, sintering plants at home and abroad have changed the two-stage drum mixing granulation process to a three-stage (one-stage strong mixer, two-stage and three-stage drum mixers) or four-stage (i.e., one-stage drum mixer, two-stage strong mixer, three-stage and four-stage drum mixer) mixing granulation process, which has prolonged the granulation time of the mixed material, effectively strengthened the granulation of the raw materials, and improved the sintering minerals and quality indicators. However, this method is not suitable for old sintering machines with compact layout and limited space. The old sintering machines have increased the feeding amount and sintering capacity by overhauling to expand the trolley area and increase the height of the side rails. However, the transformation of sintering granulation equipment is difficult to implement due to site factors, resulting in poor sintering mixing granulation effect, excessive negative pressure of the fan, aggravated air leakage of the sintering machine, insufficient effective air volume on the material surface, affecting the exhaust effect, heat transfer and combustion effect, deteriorating important economic and technical indicators such as utilization coefficient, drum strength, and yield rate, and restricting the reduction of molten iron cost. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned technology and to provide a cylindrical mixer device with a ring plate and a production method thereof, which can effectively extend the granulation time of the entire mixture and selectively extend the granulation time of the fine-particle mixture without lengthening the mixer, thereby solving the problem of poor granulation effect of the mixture caused by the limited length of the secondary mixer.

[0006] To achieve the above-mentioned purpose, the cylindrical mixer device with annular plates involved in the present invention includes a barrel body, a barrel body driving system for driving the barrel body to rotate is provided on the outside of the barrel body, the barrel body is horizontal, and the feed end is higher than the discharge end, the inner wall of the barrel body is provided with an annular interception plate group for intercepting the sintered raw materials, and also includes a swirling interception system for intercepting the sintered raw materials and throwing them in the direction of the incoming materials.

[0007] Preferably, the annular intercepting plate group includes a plurality of annular intercepting plates, and the annular intercepting plates are vertically arranged at 90° along the circumferential direction of the inner wall of the cylinder body.

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

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

[0010] Preferably, the cross-sectional shape of the annular shut-off plate is “|” and / or inverted “V” shape.

[0011] Preferably, the swirl interception system includes a bracket passing through both ends of the cylinder body, one end of the bracket is rotatably mounted on a support seat, and the other end is connected to a swirl drive system that drives it to rotate, and a plurality of swirl interception groups are evenly arranged on the bracket, and the swirl interception group includes a plurality of horizontal swirl interception devices and a vertical vertical transmission rod, and the vertical transmission rod is installed on the bracket, and the swirl interception devices are evenly distributed around the vertical transmission rod as the center, one end is installed at the lower end of the vertical transmission rod, and a interception plate is provided at the other end, and the vertical transmission rod converts the rotation of the bracket into the rotation of the swirl interception device with the vertical transmission rod as the axis.

[0012] Preferably, the distance between the intercepting plate and the inner wall of the cylinder body is 10 to 80 mm, and the height of the swirl intercepting device is 50 to 300 mm lower than the top of the rolling zone in the cylinder body.

[0013] Preferably, when the swirling intercepting device rotates, the sintering raw materials are pushed toward the feed end through the intercepting plate.

[0014] A production method of a cylindrical mixer device with a ring plate, wherein the sintering raw material enters through the feeding end of the cylinder body, is first raised as the cylinder body rotates, and then rolls and falls while moving toward the discharging end, and water is added to moisten the sintering raw material during this process;

[0015] When the sintered raw materials roll forward toward the discharge end, when they reach the annular intercepting plate in the annular intercepting plate group, the large particles of materials that have been granulated are thrown down and turn over the annular intercepting plate, and the small particles of materials continue to remain in front of the annular intercepting plate and continue the granulation process with the rotation of the barrel body until they grow larger, are thrown down and turn over the annular intercepting plate to move forward;

[0016] As the drum body rotates, the sintering raw materials are repeatedly lifted, and the large particles of granulated materials roll and fall under the action of gravity and the support force of the drum body, while the small particles of materials continue to be lifted upward and reach the rolling zone driven by the rotating drum body;

[0017] When the swirl interception system rotates through the rolling zone, the interception plate of the swirl interception system intercepts the material in the rolling zone and continues to rotate. The material is thrown in the direction of the incoming material under the action of centrifugal force. A part of the small particle material is thrown forward to the lifting zone, and another part of the small particle material is thrown forward to the cylinder wall on the other side of the mixer, rolling and merging into the initial lifting zone.

[0018] Under the joint action of the annular intercepting plate and the intercepting plate, the granulation time of the sintering raw materials is extended, especially the granulation time of small particles. Finally, the sintering raw materials are granulated into spherical particles and discharged from the discharge end.

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

[0020] 1. The annular intercepting plates are arranged at intervals in the mixer, which successfully reverses the trend of the material flow gradually becoming thinner during the axial mixing process of the mixer, and significantly improves the material flow cross-sectional occupancy rate and the uniformity of the axial material flow filling rate;

[0021] 2. Annular interception plates are arranged at intervals in the mixer, which effectively prolongs the granulation time of small particles in the lower part of the material flow, achieving a more uniform and efficient mixing and granulation effect;

[0022] 3. By setting a swirling interception device in the mixer to intercept the material in the upper rolling zone of the material flow and scatter it forward, a part of the fine-grained mixture is thrown forward to the material flow lifting zone, and the other part of the fine-grained mixture is thrown forward to the cylinder wall on the other side of the mixer to roll and merge into the initial lifting zone. The fine-grained mixture is optimized, the granulation time is specifically extended, and the mixing effect is significantly improved;

[0023] 4. Without lengthening the mixer, the overall mixture granulation time is effectively extended, which effectively solves the problem that the sintering capacity of the old sintering machine is increased and the feeding amount is increased after the transformation, while the secondary mixer cannot be lengthened or the length is limited due to compact layout and limited space, resulting in poor mixture granulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a cylindrical mixer device with an annular plate according to the present invention;

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

[0026] The components in the figure are numbered as follows:

[0027] Cylinder body 1, cylinder body driving system 2, feed end 3, discharge end 4, annular interception plate group 5, swirl interception system 6, annular interception plate 7, bracket 8, support seat 9, swirl drive system 10, swirl interception group 11, swirl interception device 12, vertical transmission rod 13, interception plate 14, rolling area 15, lifting area 16, initial lifting area 17. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of invention protection.

[0029] Example 1

[0030] like Figure 1 As shown, a cylindrical mixer device with an annular plate includes a barrel body 1. In this embodiment, the barrel body 1 has a diameter of 4m and a length of 18m. A barrel body driving system 2 for driving the barrel body 1 to rotate is provided on the outside of the barrel body 1. The barrel body 1 is horizontal, and the feed end 3 is higher than the discharge end 4. An annular intercepting plate group 5 for intercepting the sintering raw material is provided on the inner wall of the barrel body 1. The barrel body 1 also includes a swirling intercepting system 6 for intercepting the sintering raw material and throwing it in the direction of the incoming material.

[0031] Among them, in this embodiment, the annular intercepting plate group 5 includes 5 annular intercepting plates 7, and the annular intercepting plates 7 are vertically arranged at 90° along the circumferential direction of the inner wall of the cylinder body 1. The spacing between two adjacent annular intercepting plates 7 is 2000-4000 mm, and is 3000 mm in this embodiment.

[0032] In addition, the height of the annular shut-off plate 7 is 200 to 600 mm, and the height gradually increases from the feed end 3 to the discharge end 4. In this embodiment, the heights of the five annular shut-off plates 7 from the feed end 3 to the discharge end 4 are 240 mm, 260 mm, 280 mm, 300 mm and 320 mm respectively, and the cross-sectional shape of the annular shut-off plate 7 is “|” and / or inverted “V” type, and in this embodiment is “|” type.

[0033] Combination Figure 2As shown, the swirl interception system 6 includes a bracket 8 passing through both ends of the cylinder body 1, one end of the bracket 8 is rotatably mounted on a support seat 9, and the other end is connected to a swirl drive system 10 for driving it to rotate. A plurality of swirl interception groups 11 are evenly arranged on the bracket 8, and the swirl interception group 11 includes a plurality of horizontal swirl interception devices 12 and a vertical vertical transmission rod 13. In this embodiment, three horizontal swirl interception devices 12 are included, and the vertical transmission rod 13 is installed on the bracket 8. The swirl interception devices 12 are evenly distributed around the vertical transmission rod 13 as the center, one end is installed at the lower end of the vertical transmission rod 13, and a swirl plate 14 is provided at the other end. The vertical transmission rod 13 converts the rotation of the bracket 8 into the rotation of the swirl interception device 12 with the vertical transmission rod 13 as the axis.

[0034] The distance between the intercepting plate 14 and the inner wall of the cylinder body 1 is 10-80 mm, 20 mm in this embodiment, and the height of the swirl intercepting device 12 is 50-300 mm lower than the top of the rolling zone 15 in the cylinder body 1, 100 mm in this embodiment.

[0035] When the swirl interception device 12 rotates, the sintering raw materials are pushed to the feed end 3 through the interception plate 14. Figure 2 For example, Figure 2 It is a cross-sectional view of the barrel body 1, and the viewing angle is from the discharge end 4 to the feed end 3. The barrel body 1 rotates clockwise from this viewing angle. At this time, the flow formed by the sintered raw material is higher on the left. The rotation direction of the swirling intercepting device 12 is clockwise from the top view. The intercepting plate 14 will push the sintered raw material inward, that is, toward the feed end 3. When the rotation direction of the barrel body 1 changes, the rotation direction of the swirling intercepting device 12 also changes at the same time, ensuring that the intercepting plate 14 pushes the sintered raw material toward the feed end 3.

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

[0037] When this embodiment is used, the sintering raw material enters through the feeding end 3 of the barrel body 1, rises first as the barrel body 1 rotates, and then rolls and falls while moving toward the discharging end 4. During this process, water is added to moisten the sintering raw material.

[0038] When the sintered raw materials roll forward toward the discharge end 4, when they reach the annular intercepting plate 7 in the annular intercepting plate group 5, the large particles that have been granulated are thrown down and turn over the annular intercepting plate 7, and the small particles continue to remain in front of the annular intercepting plate 7 and continue the granulation process with the rotation of the barrel body 1 until they grow up, are thrown down and turn over the annular intercepting plate 7 to move forward;

[0039] As the drum body 1 rotates, the sintering raw materials are repeatedly lifted, and the large particles of granulated materials roll and fall under the action of gravity and the support force of the drum body 1, while the small particles of materials continue to be lifted upward and reach the rolling zone 15 driven by the rotating drum body 1;

[0040] When the swirl interception system 6 rotates through the rolling zone 15, the interception plate 14 of the swirl interception system 6 intercepts the material in the rolling zone 15 and continues to rotate. The material is thrown in the direction of the incoming material under the action of centrifugal force. A part of the small particle material is thrown forward to the lifting zone 16, and another part of the small particle material is thrown forward to the cylinder wall on the other side of the mixer, rolling and merging into the initial lifting zone 17.

[0041] Under the joint action of the annular intercepting plate 7 and the intercepting plate 14 , the granulation time of the sintered raw material is prolonged, especially the granulation time of small particles. Finally, the sintered raw material is granulated into spherical particles and discharged from the discharge end 4 .

[0042] Comparative Example 1

[0043] The following is the production method of conventional cylindrical granulation:

[0044] The sintering raw materials enter through the feeding end of the drum body, rise as the drum body rotates, and then roll and fall while moving toward the discharging end. Water is added during this process. Under the action of the rotation of the drum body, the moistened materials collide and squeeze with each other, gradually grow into spherical particles, and are discharged from the discharging end.

[0045] The particle size and granulation index GI of the mixed material after granulation in Example 1 -0.25 The comparison of sintering index with conventional cylindrical granulation comparative example 1 is shown in Table 1 and Table 2.

[0046] Table 1 Mixture particle size composition

[0047]

[0048]

[0049] Table 2 Sintering index comparison table

[0050]

[0051] Granulation Index

[0052] Middle: A -0.25 The proportion of -0.25mm part in the mixed material before granulation, %

[0053] B -0.25 The proportion of -0.25mm in the mixed material after granulation, %

[0054] From the results in Table 1, it can be seen that the granulation index GI of the mixed material after granulation in Example 1 is -0.25 Compared with the conventional drum mixer, it is increased by 20.8%, indicating that the granulation effect of Example 1 is better. From the results shown in Table 2, after the sintering of the sintered mixture prepared in Example 1, the vertical sintering speed, utilization coefficient, yield rate and drum strength are all higher than those of the conventional drum mixer. This is mainly because the granulation time of Example 1 is extended, the fine-grained particles are greatly reduced, the particle size composition of the mixture is more uniform, the air permeability of the sintering material layer is improved, and the sintering speed is accelerated; at the same time, the particle structure of the prepared sintered mixture is denser, and the thin-walled macroporous structure inside the sintered ore is reduced during the sintering process, making the internal structure of the sintered ore denser, thereby forming a sintered ore with better strength.

[0055] The cylindrical mixer device with annular plates and the production method thereof of the present invention are characterized in that annular intercepting plates 7 are arranged at intervals in the mixer, which successfully reverses the trend of the material flow becoming gradually thinner during the axial mixing process of the mixer, and significantly improves the material flow cross-sectional occupancy rate and the uniformity of the axial material flow filling rate; the annular intercepting plates 7 are arranged at intervals in the mixer, which effectively prolongs the granulation time of the small particle material at the lower part of the material flow, and achieves a more uniform and more efficient mixing and granulation effect; by arranging a swirling intercepting device 12 in the mixer to intercept the material in the upper rolling zone 15 of the material flow, and rotating and throwing it forward, a part of the fine particles are mixed The mixed material is thrown forward to the material flow lifting area 16, and the other part of the fine-grained mixture is thrown forward to the cylinder wall on the other side of the mixer, rolls and merges into the initial lifting area 17, so that the fine-grained mixture is optimized, the granulation time is extended in a targeted manner, and the mixing effect is significantly improved; without lengthening the mixer, the overall mixture granulation time is effectively extended, which effectively solves the problem that the sintering capacity of the old sintering machine is increased after the transformation, the feeding amount is increased, and the secondary mixer cannot be lengthened or is limited in length due to compact layout and limited space, resulting in poor granulation effect of the mixture.

[0056] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0057] The various aspects disclosed for describing the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the above description, when the detailed description of the related known functions or configurations is determined to be unnecessary to obscure the focus of the present specification and claims, the detailed description will be omitted.

[0058] Finally, it should be pointed out that the above content is a further detailed description of the invention in combination with specific implementation methods. It cannot be considered that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, simple replacements made without departing from the concept of the present invention should be regarded as belonging to the protection scope of the present invention. The above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there can be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A cylindrical mixer with an annular plate, comprising a cylinder body (1), characterized in that: The barrel body (1) is provided with a barrel body driving system (2) on the outside thereof for driving the barrel body (1) to rotate. The barrel body (1) is horizontal, and the feed end (3) is higher than the discharge end (4). The inner wall of the barrel body (1) is provided with an annular intercepting plate group (5) for intercepting the sintering raw materials, and also includes a swirling intercepting system (6) for intercepting the sintering raw materials and throwing them in the direction of the incoming materials.

2. The cylindrical mixer with annular plates as claimed in claim 1, characterized in that: The annular intercepting plate group (5) comprises a plurality of annular intercepting plates (7), and the annular intercepting plates (7) are vertically arranged at 90 degrees along the circumferential direction of the inner wall of the cylinder body (1).

3. The cylindrical mixer with annular plates as claimed in claim 2, characterized in that: The distance between two adjacent annular intercepting plates (7) is 2000-4000 mm.

4. The cylindrical mixer with annular plates as claimed in claim 2, characterized in that: The height of the annular intercepting plate (7) is 200 to 600 mm, and the height gradually increases from the feed end (3) to the discharge end (4).

5. The cylindrical mixer with annular plates as claimed in claim 2, characterized in that: The cross-sectional shape of the annular intercepting plate (7) is a "|" shape and / or an inverted "V" shape.

6. The cylindrical mixer with annular plates as claimed in claim 1, characterized in that: The swirl interception system (6) comprises a bracket (8) passing through both ends of the barrel body (1); one end of the bracket (8) is rotatably mounted on a support seat (9); the other end is connected to a swirl drive system (10) for driving the bracket to rotate; a plurality of swirl interception groups (11) are evenly arranged on the bracket (8); the swirl interception group (11) comprises a plurality of horizontal swirl interception devices (12) and a vertical transmission rod (13); the vertical transmission rod (13) is mounted on the bracket (8); the swirl interception devices (12) are evenly distributed around the vertical transmission rod (13) as the center; one end is mounted on the lower end of the vertical transmission rod (13); and the other end is provided with a interception plate (14); the vertical transmission rod (13) converts the rotation of the bracket (8) into the rotation of the swirl interception device (12) with the vertical transmission rod (13) as the axis.

7. The cylindrical mixer with annular plates as claimed in claim 6, characterized in that: The distance between the intercepting plate (14) and the inner wall of the cylinder body (1) is 10 to 80 mm, and the height of the swirl intercepting device (12) is 50 to 300 mm lower than the top of the rolling zone (15) in the cylinder body (1).

8. The cylindrical mixer with annular plates as claimed in claim 6, characterized in that: When the swirling intercepting device (12) rotates, the sintering raw materials are pushed toward the feed end (3) through the intercepting plate (14).

9. A method for producing the cylindrical mixer with annular plates as claimed in claim 1, characterized in that: The sintering raw material enters through the feed end (3) of the barrel body (1), and is first raised as the barrel body (1) rotates, and then rolled and thrown down while moving toward the discharge end (4), and water is added to moisten the sintering raw material during this process; When the sintered raw materials roll forward toward the discharge end (4), when they reach the annular intercepting plate (7) in the annular intercepting plate group (5), the large particles of material that have been granulated are thrown down and flip over the annular intercepting plate (7), and the small particles of material continue to remain in front of the annular intercepting plate (7) and continue the granulation process as the barrel body (1) rotates until they grow larger, are thrown down, flip over the annular intercepting plate (7) and move forward; As the barrel body (1) rotates, the sintering raw materials are repeatedly lifted, and the large particles of granulated materials roll and fall under the action of gravity and the support force of the barrel body (1), while the small particles of materials continue to be lifted upward and reach the rolling zone (15) driven by the rotating barrel body (1); When the swirl interception system (6) rotates through the rolling zone (15), the interception plate (14) of the swirl interception system (6) intercepts the material in the rolling zone (15) and continues to rotate. The material is thrown in the direction of the incoming material under the action of centrifugal force. A part of the small particle material is thrown forward to the lifting zone (16), and another part of the small particle material is thrown forward to the cylinder wall on the other side of the mixer, rolls and merges into the initial lifting zone (17); Under the joint action of the annular intercepting plate (7) and the intercepting plate (14), the granulation time of the sintered raw material is prolonged, especially the granulation time of small-particle materials, and finally the sintered raw material is granulated into spherical particles and discharged from the discharge end (4).

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