Novel pelletizing process screening and ore returning system

Abstract

The invention provides a novel pelletizing process screening and ore returning system. The novel pelletizing process screening and ore returning system comprises a feeding device; the pelletizing equipment is used for receiving the materials from the feeding equipment and converting the materials into pellets; the roller type screening machine is used for receiving the pellets produced by the pelletizing equipment and screening the pellets, and a first discharging opening, a second discharging opening and a third discharging opening which are used for discharging materials after screening are formed in the bottom of the roller type screening machine; pellets discharged from the first discharge hole are fed into the pelletizing equipment; the pellets discharged from the second discharge hole are fed into sintering equipment; the roller type screening machine has the beneficial effects that pellets smaller than 8 mm and larger than 16 mm can be screened through the roller type screening machine, a roller type distributing device does not need to be arranged subsequently for secondary screening, and the screening efficiency is improved; after screening, the pellets smaller than 8 mm can be directly returned into the pelletizing equipment, the number of times of transferring the pellets smaller than 8 mm is reduced, the probability of shape change of the pellets is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of metallurgical technology, and specifically relates to a novel pelletizing process screening and ore return system. Background Art

[0002] In the process of iron ore pellet production, the diameter of the pellets entering the chain grate machine or belt roaster (hereinafter referred to as the roasting system) is required to be 8-16mm. In the current pellet production process, there are two types of screening systems for the pelletizing process: step screening system and centralized screening system.

[0003] 1. Step-by-step screening system process flow:

[0004] A. After the pellets are produced by the pelletizing disc or the drum pelletizing machine, they enter the belt conveyor;

[0005] B. The pellets are conveyed to a secondary roller screening device (with a screen roller gap of 8 mm and a screen roller gap of 16 mm) by a belt conveyor for screening;

[0006] C.

[0007] c1. Pellets smaller than 8mm and pellets larger than 16mm enter the return ore system;

[0008] C2.8~16mm pellets will be collected and fed into a larger belt conveyor, and then into the material distribution system;

[0009] D. After the pellets are leveled and screened twice by the roller distributor in the distribution system;

[0010] E.

[0011] e1. Pellets smaller than 8mm enter the ore return system;

[0012] e2. Qualified pellets enter the roasting system;

[0013] 2. Centralized screening system process flow:

[0014] A. After the pellets are produced by the pelletizing disc or the drum pelletizing machine, they enter the belt conveyor;

[0015] B. Through the transfer of belt conveyor, the pellets produced by all pelletizing equipment are collected on a larger belt conveyor;

[0016] C. Through this larger belt conveyor, all the pellets are collected and sent to the single-stage roller screening equipment (the gap between the screen rollers is less than 16mm) for screening through the shuttle distributor;

[0017] D.

[0018] d1. Pellets smaller than 16 mm enter the distribution system;

[0019] d2. Pellets larger than 16 mm enter the ore return system;

[0020] E. After the pellets are leveled and screened twice by the roller distributor in the distribution system;

[0021] F.

[0022] f1. Pellets smaller than 8mm enter the ore return system;

[0023] f2. Qualified pellets enter the roasting system.

[0024] The existing pelletizing process's return ore system generally collects the screened materials from the roller screen and roller distributor, and then transports this part of the wet return ore back to the mixing ore tank in the pelletizing chamber through multiple reversals of the belt conveyor, and then participates in the pelletizing process again. Whether it is a pellet smaller than 8mm or a pellet larger than 16mm, it will be broken during the reversal process, but it will not be completely restored to a powdery form. This part of the pelletized return ore re-enters the pelletizing equipment, which will reduce the working efficiency of the pelletizing equipment. Summary of the invention

[0025] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0026] In order to solve the above problems, the present application provides a novel pelletizing process screening and ore return system, comprising:

[0027] Feeding equipment;

[0028] A pelletizing device, receiving the material from the feeding device and converting the material into pellets;

[0029] A roller screening machine receives the pellets produced by the pelletizing equipment and screens the pellets. The bottom of the roller screening machine is provided with a first discharge port, a second discharge port and a third discharge port for discharging the pellets after screening.

[0030] The pellets discharged from the first discharge port are fed into the pelletizing equipment;

[0031] The pellets discharged from the second discharge port are fed into a sintering device;

[0032] The pellets discharged from the third discharge port are fed into the feeding device.

[0033] Optionally, the first discharge port discharges pellets with a diameter less than 8 mm, the second discharge port discharges pellets with a diameter of 8 mm to 16 mm, and the third discharge port discharges pellets with a diameter greater than 16 mm.

[0034] Optionally, a first material elevator is provided between the first discharge port and the pelletizing equipment.

[0035] Optionally, a second material elevator is provided between the third discharge port and the feeding device.

[0036] Optionally, a crusher is provided between the third discharge port and the second material elevator.

[0037] Optionally, the crusher is a crushing screw conveyor.

[0038] Optionally, a first conveyor, a second conveyor and a third conveyor are arranged between the second discharge port and the sintering equipment.

[0039] Optionally, the first conveyor is a belt conveyor, the second conveyor is a swing belt conveyor, and the third conveyor is a wide belt conveyor.

[0040] Optionally, the pelletizing equipment is a disc pelletizing machine or a cylinder pelletizing machine.

[0041] Optionally, the feeding equipment is a mixed material trough or a feeding conveyor.

[0042] Beneficial Effects

[0043] A novel pelletizing process screening and ore return system provided in the embodiments of the present invention has the following beneficial effects:

[0044] 1. The roller screening machine can screen pellets smaller than 8mm and larger than 16mm, without the need for subsequent roller distributors for secondary screening, thus improving screening efficiency;

[0045] 2. After screening, pellets smaller than 8mm can be directly returned to the pelletizing equipment, reducing the number of times pellets smaller than 8mm are transported, reducing the probability of their shape changing, and improving work efficiency;

[0046] 3. The pellets larger than 16mm are crushed and transported through the crushing screw conveyor, realizing the crushing function of the crushing return machine with a relatively small investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the present invention.

[0048] The reference numerals are:

[0049] 1. Feeding equipment; 2. Pelletizing equipment; 3. Roller screening machine; 4. Sintering equipment; 5. First material elevator; 6. Second material elevator; 7. Crusher; 8. First conveyor; 9. Second conveyor; 10. Third conveyor. DETAILED DESCRIPTION

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0054] See also Figure 1 As shown, according to an embodiment of the present application, a novel ball making process screening and ore return system is provided, comprising:

[0055] Feeding equipment 1;

[0056] A pelletizing device 2 receives the material from the feeding device 1 and converts the material into pellets;

[0057] A roller screening machine 3 receives the pellets produced by the pelletizing device 2 and screens the pellets. The bottom of the roller screening machine 3 is provided with a first discharge port, a second discharge port and a third discharge port for discharging the pellets after screening.

[0058] The pellets discharged from the first discharge port are fed into the pelletizing device 2;

[0059] The pellets discharged from the second discharge port are fed into the sintering device 4;

[0060] The pellets discharged from the third discharge port are fed into the feeding device 1 .

[0061] The novel pelletizing process screening and ore return system provided by the technical solution includes: a feeding device 1, a pelletizing device 2 and a roller screening machine 3. The feeding device 1 can stably and accurately convey the material to the subsequent pelletizing device 2. The feeding device 1 can adopt a belt conveyor device driven by a variable frequency speed regulating motor to adjust the material supply according to the production demand of the pelletizing device 2 to ensure the continuity and stability of the material supply. The pelletizing device 2 receives the material from the feeding device 1 and converts the material into pellets.

[0062] The roller screening machine 3 is an extended device, which increases the screening length of the screening section for pellets less than 8mm. It can receive the pellets produced by the pelletizing device 2 and screen the pellets efficiently. The first discharge port, the second discharge port and the third discharge port opened at the bottom of the roller screening machine 3 realize the precise diversion of pellets of different specifications. The pellets discharged from the first discharge port are fed to the pelletizing device 2. These pellets are smaller than the expected size. They are returned to the pelletizing device 2 for reprocessing, which can effectively improve the overall quality and qualified rate of the pellets. The pellets discharged from the second discharge port are fed to the sintering device 4. These pellets are pellets that meet the expected size and meet the requirements of the sintering process. They are directly transported to the sintering device 4 for sintering. The pellets discharged from the third discharge port are fed to the feeding device 1. These pellets are larger than the expected size. They are returned to the feeding device 1 for re-feeding, which reduces the waste of materials and improves the utilization rate of resources. By directly screening out pellets smaller than the expected size and feeding them into the pelletizing device 2 for pelletizing, the pellets can be pelletized to avoid the possibility of breakage during multiple returns. This can also improve the production efficiency and quality efficiency of the pelletizing device 2 and the entire pelletizing process. Pellets larger than the expected size can be screened out and fed into the feeding device 1 to reduce material waste.

[0063] The first discharge port discharges pellets with a diameter less than 8 mm, the second discharge port discharges pellets with a diameter of 8 mm to 16 mm, and the third discharge port discharges pellets with a diameter greater than 16 mm.

[0064] In this technical solution, the first discharge port at the bottom of the roller screening machine 3 discharges pellets with a diameter less than 8 mm. These pellets with smaller diameters may fail to reach the expected size during the pelletizing process due to insufficient pelletizing conditions or uneven stirring. After being transported back to the pelletizing device 2, pelletizing operations can be carried out, thereby effectively improving production efficiency.

[0065] The second discharge port discharges pellets with a diameter of 8mm-16mm. Pellets in this specification range meet the requirements of the sintering process for pellet size and can be directly transported to the sintering equipment 4 for sintering. This achieves efficient material flow, avoids excessive processing and unnecessary transportation of pellets, greatly improves production efficiency, and also ensures that the sintering process can obtain stable and appropriately sized pellet raw materials, which is conducive to the smooth progress of the sintering process and the improvement of the quality of the sintered products.

[0066] The third discharge port discharges pellets with a diameter greater than 16 mm. Such pellets with a larger diameter can be sent back to the feeding device 1 to participate in the pelletizing process again, so that they can be crushed, mixed and re-formed in a new round of pelletizing cycle, making full use of material resources, avoiding the situation where pellets are discarded due to being too large, and reducing production costs.

[0067] A first material elevator 5 is provided between the first discharge port and the pelletizing device 2 .

[0068] In this technical solution, a first material elevator 5 is provided between the first discharge port and the pelletizing device 2. The first material elevator 5 adopts an advanced chain or belt lifting structure, and its chain or conveyor belt has high strength, wear resistance and corrosion resistance, such as high-quality alloy steel chain or conveyor belt with special rubber coating, to ensure stable operation during long-term conveying of pellets with a diameter of less than 8 mm, and is not prone to breakage or wear.

[0069] The lifting height of the first material elevator 5 meets the height of the feed port of the pelletizing equipment 2, ensuring that the pellets discharged from the first discharge port can be accurately transported to the pelletizing equipment 2, realizing efficient material return. During operation, the first material elevator 5 has a stable operating speed adjustment function, which can be dynamically adjusted according to the production situation of the pelletizing equipment 2 and the material flow rate of the first discharge port, so as to avoid affecting the continuity of the entire pelletizing process due to too fast or too slow material transportation. For example, when the pelletizing equipment 2 is in a high-load production state and the demand for small pellets is large, the first material elevator 5 can appropriately increase the operating speed and increase the material transportation volume; on the contrary, when the production rhythm of the pelletizing equipment 2 slows down or the processing capacity of small pellets is limited, the first material elevator 5 will reduce the operating speed accordingly, reduce the material transportation volume, so as to achieve material transportation matching the production situation of the pelletizing equipment 2.

[0070] A second material elevator 6 is provided between the third discharge port and the feeding device 1 .

[0071] A crusher 7 is provided between the third material discharge port and the second material elevator 6 .

[0072] The crusher 7 is a crushing screw conveyor.

[0073] In this technical solution, a second material elevator 6 is installed between the third discharge port and the feeding device 1. The second material elevator 6 also adopts a sturdy and durable structural design, and its key components such as the drive motor, transmission device and lifting components are made of high-quality materials to ensure stable operation and a long service life when processing diameters greater than pellets. Its lifting height and conveying capacity are set according to the feeding requirements of the feeding device 1, and can efficiently lift and convey the material from the third discharge port to the feeding device 1.

[0074] The crusher 7 arranged between the third discharge port and the second material hoist 6 is a crushing screw conveyor, which can effectively crush large pellets with a diameter greater than 16 mm. The spiral blades inside the crushing screw conveyor are made of high-strength alloy steel and have good wear resistance and crushing ability. During operation, after the large pellets enter the crushing screw conveyor, as the spiral blades rotate, the pellets are gradually crushed into smaller particles by various forces such as extrusion and shearing during the conveying process. The speed of the crushing screw conveyor can be flexibly adjusted according to the hardness, size and required crushing degree of the pellets. For example, when encountering pellets with higher hardness, the speed can be appropriately increased to enhance the crushing effect; and when the pellet sizes vary greatly, the variable speed adjustment method can be adopted, first coarse crushing at a lower speed, and then fine crushing at a higher speed, to ensure that the particle size of the crushed material is uniform and meets the feeding requirements of the feeding device 1. The setting of the crushing screw conveyor not only realizes the effective crushing of large pellets, but also closely combines the crushing process with the material conveying process, reduces the material processing links and the equipment footprint, improves the operating efficiency and compactness of the entire return ore system, and reduces production costs and energy consumption.

[0075] A first conveyor 8 , a second conveyor 9 and a third conveyor 10 are arranged between the second discharge port and the sintering equipment 4 .

[0076] The first conveyor 8 is a belt conveyor, the second conveyor 9 is a swing belt conveyor, and the third conveyor 10 is a wide belt conveyor.

[0077] In this technical solution, the first conveyor 8, the second conveyor 9 and the third conveyor 10 arranged between the second discharge port and the sintering equipment 4 are used to transport pellets of the expected size. The first conveyor 8 is a belt conveyor, which adopts high-quality conveyor belt materials, such as high-strength rubber conveyor belts, and is equipped with stable and reliable drive motors and transmission devices. The conveyor belt surface of the belt conveyor has good anti-slip properties, which can effectively prevent pellets with a diameter of 8mm-16mm from slipping during transportation, ensuring the stability and continuity of material transportation. Its conveying speed can be adjusted according to the feeding demand of the sintering equipment 4. During normal production, it continuously provides pellet materials to the subsequent conveyor at a stable speed to ensure the smooth progress of the entire material transportation process.

[0078] The second conveyor 9 is a swinging belt conveyor, the swinging angle and amplitude of which can be adjusted according to actual needs, and can accurately transport the pellets transported by the first conveyor 8 to different target locations. For example, when a certain feed port of the sintering equipment 4 has a temporary failure or material diversion is required, the swinging belt conveyor can adjust the swinging direction to quickly transport the pellets to other normal feed ports, avoiding the interruption of the entire production process due to a single feed port problem, and improving the system's fault tolerance and production flexibility. The third conveyor 10 is a wide belt conveyor, and its wide conveyor belt can adapt to the needs of transporting a large flow of pellets.

[0079] Through the coordinated work of these three different types of conveyors, efficient, stable and accurate transportation of the pelletized material from the second discharge port to the sintering equipment 4 is achieved, effectively improving the fluency and reliability of production.

[0080] The pelletizing equipment 2 is a disc pelletizing machine or a cylinder pelletizing machine.

[0081] In this technical solution, the pelletizing equipment 2 can use a disc pelletizing machine or a cylinder pelletizing machine. By closely cooperating with other equipment such as the feeding equipment 1 and the roller screening machine 3, the efficient conversion and recycling of materials can be achieved, effectively improving production efficiency, product quality and resource utilization.

[0082] The feeding equipment 1 is a mixed material trough or a feeding conveyor.

[0083] In this technical solution, if the feeding equipment 1 adopts a mixed material trough, it has good material storage and buffering functions, and can store a sufficient amount of mixed materials to ensure that when there is a short-term fluctuation in material supply or other equipment is temporarily repaired, it can still continuously and stably provide materials to the pelletizing equipment 2 to ensure the continuity of the entire pelletizing process. A precise discharging device is provided at the bottom of the mixed material trough, such as a gate with adjustable opening or a spiral feeder, which can control the material discharge flow and speed according to the real-time production needs of the pelletizing equipment 2, realize uniform and stable supply of materials, and avoid affecting the quality and production efficiency of pellets due to uneven material supply.

[0084] When the feeding device 1 is a feeding conveyor, it can efficiently convey the mixed materials from other processes or storage sites to the pelletizing device 2. The feeding conveyor can be equipped with advanced material flow monitoring and control devices, such as a combination of an electronic belt scale and a variable frequency speed regulating motor, to monitor the material conveying volume in real time, and automatically adjust the conveying speed according to the working status of the pelletizing device 2, to ensure the precise matching of material supply and pelletizing production.

[0085] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A new type of pelletizing process screening and ore return system, characterized in that: include: Feeding equipment (1); A pelletizing device (2) receives the material from the feeding device (1) and converts the material into pellets; A roller screening machine (3) receives the pellets produced by the pelletizing device (2) and screens the pellets. The bottom of the roller screening machine (3) is provided with a first discharge port, a second discharge port and a third discharge port for discharging the pellets after screening. The pellets discharged from the first discharge port are fed into the pelletizing device (2); The pellets discharged from the second discharge port are fed into a sintering device (4); The pellets discharged from the third discharge port are fed into the feeding device (1).

2. The novel pelletizing process screening and ore return system according to claim 1 is characterized in that: The first discharge port discharges pellets with a diameter less than 8 mm, the second discharge port discharges pellets with a diameter of 8 mm to 16 mm, and the third discharge port discharges pellets with a diameter greater than 16 mm.

3. The novel pelletizing process screening and ore return system according to claim 2 is characterized in that: A first material elevator (5) is provided between the first discharge port and the pelletizing device (2).

4. The novel pelletizing process screening and ore return system according to claim 2 is characterized in that: A second material elevator (6) is provided between the third material outlet and the feeding device (1).

5. The novel pelletizing process screening and ore return system according to claim 4 is characterized in that: A crusher (7) is provided between the third material discharge port and the second material elevator (6).

6. The novel pelletizing process screening and ore return system according to claim 5 is characterized in that: The crusher (7) is a crushing screw conveyor.

7. The novel pelletizing process screening and ore return system according to claim 2 is characterized in that: A first conveyor (8), a second conveyor (9) and a third conveyor (10) are arranged between the second discharge port and the sintering equipment (4).

8. The novel pelletizing process screening and ore return system according to claim 7 is characterized in that: The first conveyor (8) is a belt conveyor, the second conveyor (9) is a swing belt conveyor, and the third conveyor (10) is a wide belt conveyor.

9. The novel pelletizing process screening and ore return system according to claim 1 is characterized in that: The pelletizing equipment (2) is a disc pelletizing machine or a cylinder pelletizing machine.

10. The novel pelletizing process screening and ore return system according to claim 1 is characterized in that: The feeding equipment (1) is a mixed material trough or a feeding conveyor.

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