Production method of green pellets for steelmaking
By entering the wet rebate part into the pellet machine and the fine material silo for processing, the problem of unstable wet rebate amount is solved, the quality and output of the pellet is improved, the particle size and production efficiency of the pellet material are improved, and the Rotary kiln ring cycle.
Patent Information
- Application Number
- CN202411469214.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-01-03
AI Technical Summary
In the existing raw ball production process for steelmaking, the amount of wet rebate is unstable, resulting in a decrease in the quality and output of raw balls. The storage of the ball bin is too high, which affects the particle size and production efficiency of the material, and is easy to cause rotary kiln junction. lock up.
Inject part of the wet rebate into the ball making machine and directly participate in the ball making, and the other part of the wet rebate is input into the fine material silo and dried, ground and batched together with the concentrate raw materials to form powdered materials, control the stock of the ball making warehouse and transported The belt and control valve regulate the wet return volume.
Improve the particle size and quality of the sphere-making materials, improve the quality and output of the raw spheres, reduce the amount of wet return material to the warehousing, avoid excessive storage of the warehousing warehouse, extend the ring cycle of the rotary kiln, and improve the The roasting atmosphere.
Smart Images
Figure CN119242930A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of green ball production, and more specifically, relates to a method for producing green balls for steelmaking. Background Art
[0002] Pelletizing is a kind of man-made block ore, which is the process of converting powdered materials into physical properties and chemical compositions that can meet the requirements of the next smelting step. Pelletizing is to prepare raw materials, mix them according to a certain proportion, add water and roll them on the pelletizing machine to make raw balls of a certain diameter, and then screen them through a small roller screen to select qualified raw balls with diameters that meet the requirements. Those with diameters that do not meet the requirements are used as wet return materials, which are returned to the pelletizing bin of the pelletizing machine, and qualified raw balls are carried out to the next process. Such a raw ball production process based on a chain grate machine and a rotary kiln is affected by factors such as concentrate moisture, concentrate particle size, bentonite quality, equipment, and climate. The amount of wet return materials is unstable, and sometimes it suddenly increases sharply. It is difficult to see improvement by adjusting the moisture content of the mineral powder, the proportion of bentonite, the inclination angle and speed of the pelletizing disk, and replacing the scraper. Too much wet return material returns to the pelletizing bin to participate in the pelletizing again, affecting the quality of the raw balls. At the same time, it causes the bucket inventory in the pelletizing bin to be too high, forcing the reduction of the feeding amount of powdered materials, affecting the particle size of the materials participating in the pelletizing. At the same time, too much wet return material re-participates in the pelletizing process, which will cause a decrease in the output of qualified raw balls, affect production efficiency, and easily cause the production atmosphere to deteriorate, accelerating the ringing of the rotary kiln. Summary of the invention
[0003] The purpose of the present invention is to provide a method for producing raw balls for steelmaking in view of the deficiencies in the prior art, so as to solve the problems in the prior art that all wet return materials are returned to the ball making bin to participate in ball making, which affects the quality and output of raw balls, and easily causes the ball making bin to have too high a stock level, thus affecting the particle size of the material participating in ball making.
[0004] In order to achieve the above object, the present invention provides a method for producing green balls for steelmaking, comprising:
[0005] Dry, grind and batch the concentrate materials in the concentrate bin to form powdery materials;
[0006] The powdered material is fed into the pelletizing machine to produce raw pellets;
[0007] Screen the green balls and output qualified green balls and wet return materials;
[0008] A part of the wet return material is fed into the pelletizing machine, and the other part of the wet return material is fed into the fine material bin.
[0009] Optionally, the concentrate raw material passes through a dryer, a roller mill and a batching room in sequence for drying, grinding and batching to form the powdery material.
[0010] Optionally, the diameter of the qualified green balls is not less than 8 mm and not more than 16 mm, and the diameter of the wet return material is less than 8 mm or more than 16 mm.
[0011] Optionally, the qualified green balls are input into a chain grate for drying and preheating.
[0012] Optionally, the amount of the wet return material input into the pelletizing machine is controlled according to the stock level in the pelletizing bin of the pelletizing machine.
[0013] Optionally, the flow rate of the wet return material input into the concentrate bin is 20-40 t / h.
[0014] Optionally, the wet return material is input into the pelletizing machine through a first conveyor belt, and a lower hopper of the first conveyor belt is provided with a control valve;
[0015] The amount of the wet return material input into the fine material bin is adjusted by the opening of the control valve.
[0016] Optionally, a second conveyor belt is provided below the control valve;
[0017] Another part of the wet return material is fed into the fine material bin through the second conveyor belt.
[0018] Optionally, the control valve is a flap type structure.
[0019] Optionally, auxiliary materials are added to the concentrate raw material in the batching room, and the auxiliary materials include bentonite and dust removal ash, and the materials are mixed after batching.
[0020] The present invention provides a method for producing raw balls for steelmaking, which has the beneficial effects of: the method for producing raw balls for steelmaking inputs a part of wet return material into a ball making machine to directly participate in ball making, and inputs another part of the wet return material into a fine material bin, and uses the wet return material together with the concentrate raw material in the fine material bin as a raw material; the wet return material entering the fine material bin is dried, ground and mixed together with the concentrate raw material, and is used as a powder material and input into the ball making machine, which can maintain the proportion of the ground powder material, improve the particle size of the material participating in the ball making, make the overall particle size smaller, improve the quality of the material participating in the ball making, and then improve the quality and output of the raw balls, and at the same time can reduce the amount of the wet return material returned to the ball making bin, avoid too high a bucket of the ball making bin, and can improve the roasting atmosphere in the rotary kiln, and extend the ring forming period of the rotary kiln.
[0021] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.
[0023] Figure 1 A flow chart of a method for producing green balls for steelmaking according to an embodiment of the present invention is shown. DETAILED DESCRIPTION
[0024] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.
[0025] like Figure 1 As shown, the present invention provides a method for producing green balls for steelmaking, comprising:
[0026] Dry, grind and batch the concentrate materials in the concentrate bin to form powdery materials;
[0027] The powdered material is fed into the pelletizing machine to produce raw pellets;
[0028] Screen the green balls and output qualified green balls and wet return materials;
[0029] A part of the wet return material is fed into the pelletizing machine, and the other part of the wet return material is fed into the fine material bin.
[0030] Specifically, in order to solve the problem in the prior art that all the wet return materials are returned to the pelletizing bin to participate in the pelletizing, which affects the quality and output of the raw balls, and easily causes the pelletizing bin to have too high a storage capacity, affecting the particle size of the material participating in the pelletizing; the production method of raw balls for steelmaking provided by the present invention inputs a part of the wet return materials into the pelletizing machine to directly participate in the pelletizing, and inputs the other part of the wet return materials into the fine material bin, and uses the concentrated ore raw materials in the fine material bin as raw materials. The wet return materials entering the fine material bin are dried, ground and mixed together with the concentrated ore raw materials, used as powdered materials and input into the pelletizing machine, which can maintain the proportion of ground powdered materials, improve the particle size of the materials participating in the pelletizing, make the overall particle size smaller, improve the quality of the materials participating in the pelletizing, and thus improve the quality and output of the raw balls, and at the same time can reduce the amount of the wet return materials returned to the pelletizing bin, avoid too high a storage capacity in the pelletizing bin, and can improve the roasting atmosphere in the rotary kiln, and extend the ring forming period of the rotary kiln.
[0031] Optionally, the concentrate raw material passes through a dryer, a roller mill and a batching room in sequence for drying, grinding and batching to form a powdery material.
[0032] Specifically, the concentrate raw materials are dried in a dryer, and then finely ground in a high-pressure roller mill to reduce their particle size. After that, auxiliary materials are added to the batching room for batching to prepare powdered materials for pelletizing.
[0033] Optionally, the diameter of qualified green balls is not less than 8 mm and not more than 16 mm, and the diameter of wet return material is less than 8 mm or more than 16 mm.
[0034] Specifically, the raw balls produced by the ball making machine can be screened on a small roller screen. The balls with a diameter of not less than 8 mm and not more than 16 mm are qualified raw balls. Qualified raw balls will proceed to the next process, while unqualified raw balls will be returned as wet materials.
[0035] Optionally, qualified green pellets are input into a chain grate for drying and preheating.
[0036] Specifically, qualified green balls can be sent to a chain grate machine via a belt for drying and preheating, in preparation for the next step of using the qualified green balls. The qualified green balls are the products.
[0037] Optionally, the amount of wet return material input into the pelletizing machine is controlled according to the bucket inventory of the pelletizing bin of the pelletizing machine.
[0038] Specifically, in the prior art, too much wet return material returns to the pelletizing bin to directly participate in the pelletizing, which will cause the bucket inventory of the pelletizing bin to be too high, and the feeding amount of the powdered material can only be forced to reduce, so that the proportion of the material finely ground by the high-pressure roller mill is reduced, affecting the particle size of the material participating in the pelletizing; the production method of raw balls for steelmaking controls the amount of wet return material input into the pelletizing machine according to the bucket inventory in the pelletizing bin, can control the bucket inventory of the pelletizing bin, does not need to reduce the feeding amount of the powdered material finely ground by the high-pressure roller mill, ensures the particle size of the material participating in the pelletizing, and can improve the quality and output of the raw balls.
[0039] Furthermore, in the prior art, when all wet return materials are returned to the pelletizing bin to directly participate in pelletizing, during the production process, among the materials entering the pelletizing bin to participate in pelletizing, the -200 mesh particle size is about 73%-78%, and the -200 mesh particle size of the materials suitable for pelletizing needs to reach more than 80%; when adopting the production method of raw balls for steelmaking, since another part of the wet return materials passes through the concentrate bin and then the dryer and the high-pressure roller mill, the ball cores in the wet return materials are crushed to a powder state, thereby increasing the proportion of -200 mesh particle size in the materials participating in pelletizing in the pelletizing bin by 8%-10%, thereby meeting the particle size requirement of the materials suitable for pelletizing.
[0040] Optionally, the flow rate of the wet return material input into the concentrate bin is 20-40 t / h.
[0041] Specifically, the ratio of the wet return material entering the pelletizing bin and the fine material bin can be controlled by controlling the flow rate of the wet return material entering the fine material bin.
[0042] Optionally, the wet return material is fed into the pelletizing machine via a first conveyor belt, and a control valve is provided at the lower hopper of the first conveyor belt;
[0043] The amount of wet return material input into the concentrate bin is regulated by the opening of the control valve.
[0044] Optionally, a second conveyor belt is provided below the control valve;
[0045] The other part of the wet return material is fed into the fine material bin through the second conveyor belt.
[0046] Optionally, the control valve is a flap type structure.
[0047] In this embodiment, according to the actual situation on site, a manual flap control valve is installed on the lower hopper of the first conveyor belt head wheel, and a second conveyor belt is added under the lower hopper. The second conveyor belt can be directly connected to the concentrate bin to transport the wet return material to the concentrate bin. By controlling the opening of the manual flap control valve, the amount of wet return material on the second conveyor belt can be adjusted; of course, in actual production, all the wet return materials can enter the concentrate bin through the second conveyor belt.
[0048] Furthermore, after the wet return material is transported to the concentrate bin, the opening of the control valve can be adjusted to maintain a reasonable level of the wet return material in the pelletizing bin.
[0049] Optionally, auxiliary materials including bentonite and dust removal ash are added to the concentrate raw material in a batching room, and the materials are mixed after batching.
[0050] Specifically, the concentrate raw material added with wet return material is dehydrated by a dryer to make its moisture content suitable for pelletizing, thereby forming a dehydrated concentrate raw material; the dehydrated concentrate raw material is finely ground by a high-pressure roller mill, so that the ball cores therein are crushed into a powder state, and a sufficient amount of raw material finely ground by roller pressing can ensure that the particle size of the material participating in the pelletizing in the pelletizing bin is suitable for pelletizing; the concentrate raw material finely ground by the high-pressure roller mill is added with bentonite and dust removal ash in the batching room, and then mixed by a strong mixer, and then transported by a belt to the pelletizing bin to participate in the pelletizing.
[0051] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.
Claims
1. A method for producing green balls for steelmaking, characterized in that: include: Dry, grind and batch the concentrate materials in the concentrate bin to form powdery materials; The powdered material is fed into the pelletizing machine to produce raw pellets; Screen the green balls and output qualified green balls and wet return materials; A part of the wet return material is fed into the pelletizing machine, and the other part of the wet return material is fed into the fine material bin.
2. The method for producing green balls for steelmaking according to claim 1, characterized in that: The concentrate raw material is sequentially dried, ground and batched in a dryer, a roller mill and a batching room to form the powdery material.
3. The method for producing green balls for steelmaking according to claim 1, characterized in that: The diameter of the qualified green balls is not less than 8 mm and not more than 16 mm, and the diameter of the wet return material is less than 8 mm or more than 16 mm.
4. The method for producing green balls for steelmaking according to claim 1, characterized in that: The qualified green balls are input into the chain grate for drying and preheating.
5. The method for producing green balls for steelmaking according to claim 1, characterized in that: The amount of the wet return material input into the pelletizing machine is controlled according to the bucket inventory of the pelletizing bin of the pelletizing machine.
6. The method for producing green balls for steelmaking according to claim 1, characterized in that: The flow rate of the wet return material input into the concentrate bin is 20-40 t / h.
7. The method for producing green balls for steelmaking according to claim 1, characterized in that: The wet return material is input into the pelletizing machine through a first conveying belt, and a lower hopper of the first conveying belt is provided with a control valve; The amount of the wet return material input into the fine material bin is adjusted by the opening of the control valve.
8. The method for producing green balls for steelmaking according to claim 7, characterized in that: A second conveyor belt is arranged below the control valve; Another part of the wet return material is fed into the fine material bin through the second conveyor belt.
9. The method for producing green balls for steelmaking according to claim 7, characterized in that: The control valve is a flap type structure.
10. The method for producing green balls for steelmaking according to claim 2, characterized in that: Auxiliary materials are added into the concentrate raw material in the batching room, wherein the auxiliary materials include bentonite and dust removal ash, and the materials are mixed after batching.