A system and method for reducing feo in pellets in a belt induration machine

Abstract

This application provides a system and method for reducing FeO content in belt roaster pellets, comprising: a receiving hopper, a vibrating feeder, a magnetic separation component, a distribution component, a first conveyor belt, a second conveyor belt, and a bottom silo. The receiving hopper is used to store materials and is connected to the feed inlet of the vibrating feeder. The magnetic separation component is disposed below the vibrating feeder for conveying and magnetically separating the materials. The distribution component is disposed below the magnetic separation component on the side away from the vibrating feeder. This invention reduces the FeO content in the final pellets by selecting pellets with high FeO content after belt roasting and using the magnetically separated pellets with low FeO content as the finished product, thereby improving the quality of the pellets. Furthermore, using the selected high-FeO-content pellets as bottom silo for further high-temperature oxidation shortens the roasting time of the belt roaster.

Description

Technical Field

[0001] This application belongs to the field of iron and steel metallurgy technology, specifically relating to a system and method for reducing FeO in pellets produced by a belt roaster. Background Technology

[0002] The key features of a belt calciner are that drying, preheating, calcination, homogenization, and cooling are all performed on the same equipment, keeping the pellet layer relatively stationary. The entire working surface of the belt calciner is covered by a fume hood and divided into sections along its length. The green pellet layer is approximately 300mm thick, and the process airflow is regulated by fuel consumption, fans, and valves. Fluctuations in the process airflow and the permeability of the pellet layer only affect a portion of the layer and are quickly discharged. Currently, belt calciners employ both bottom and edge material laying processes, with the bottom and edge materials derived from the screened finished pellets. The bottom material thickness is typically 75–100mm. This bottom material laying process not only improves the problem of incomplete burning of the pellet layers on both sides but also protects the side panels and grates of the calciner, extending its service life. Therefore, bottom material laying is indispensable in the current belt calciner pelleting process.

[0003] A key characteristic of belt roasters is that the feed layer remains stationary relative to the trolley during roasting. This stationary state results in differences in the temperature of the high-temperature flue gas received by the upper and lower pellets, the duration of high-temperature maintenance, and the roasting temperature. Consequently, the properties of the pellets in the upper and lower parts of the belt roaster's feed layer differ, often leading to a higher FeO content in the final product and reduced product quality. The pellets used as the bottom feed in belt roasters are merely screened finished pellets and have almost no positive effect on reducing the FeO content in the final pellets. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To address the aforementioned issues, this application provides a system for reducing FeO in pellets from a belt roaster, comprising: a receiving hopper, a vibrating feeder, a magnetic separation assembly, a material distribution assembly, a first conveyor belt, a second conveyor belt, and a bottom silo.

[0006] The receiving hopper is used to store materials and is connected to the feed inlet of the vibrating feeder. The magnetic separation component is located below the vibrating feeder and is used for conveying and magnetically separating materials. The material distribution component is located below the magnetic separation component on the side away from the vibrating feeder and can distribute the magnetically separated materials. The first conveyor belt is located below the material distribution component and is used to convey the target product separated by the material distribution component. The second conveyor belt is located below the material distribution component and is used to convey the finished product separated by the material distribution component. The bottom material bin is located on one side of the first conveyor belt, and the first conveyor belt feeds the target product into the bottom material bin for use as bottom material in the belt roaster.

[0007] Optionally, the magnetic separation assembly includes: a pulley, a magnetic pulley, and a magnetic separation belt;

[0008] The pulley and the magnetic pulley are mounted on the support, with the magnetic pulley positioned on the side of the support away from the vibrating feeder, and the magnetic separation belt sleeved on the outside of the pulley and the magnetic pulley.

[0009] Optionally, the magnetic field strength of the magnetic pulley is 5000gs-15000gs.

[0010] Optionally, the magnetic field strength of the magnetic pulley is 10000 gs.

[0011] Optionally, the material distribution assembly includes: a material distribution hopper, a material distribution plate, a first discharge port, and a second discharge port;

[0012] The material distribution hopper is equipped with a material distribution plate, and the bottom of the material distribution hopper has a first discharge port and a second discharge port. The first discharge port is located above the first conveyor belt, and the second discharge port is located above the second conveyor belt.

[0013] Optionally, the axis of the material distribution plate and the axis of the magnetic pulley are in the same vertical plane.

[0014] Optionally, the distance between the uppermost end of the material distribution plate and the lowermost end of the magnetic pulley is not less than 500mm.

[0015] This application also provides a method for reducing FeO in belt roaster pellets, using any of the above-mentioned systems for reducing FeO in belt roaster pellets, comprising the following steps:

[0016] Step 1: Unload the cooled pellets from the belt roaster or screening machine and put them into the receiving hopper for storage;

[0017] Step 2: The vibrating feeder feeds the material stored in the receiving hopper onto the magnetic separation belt. The magnetic separation belt transports the material and performs magnetic separation through magnetic pulleys.

[0018] Step 3: The material selected by the magnetic pulley is fed into the distribution hopper and distributed by the distribution plate. The target product selected by the magnetic pulley is discharged through the first discharge port and falls onto the first conveyor belt. The finished product selected by the magnetic pulley is discharged through the second discharge port and falls onto the second conveyor belt.

[0019] Step 4: The first conveyor belt feeds the target product into the base material bin for use as base material in the belt roasting machine, and the second conveyor belt transports the finished product to the finished product bin.

[0020] Beneficial effects

[0021] The embodiments of the present invention provide a system and method for reducing FeO in belt roaster pellets. By selecting pellets with high FeO content after belt roasting and using those with low FeO content after magnetic separation as finished products, the FeO content in the final pellets can be reduced, thereby improving the quality of the pellets. The selected pellets with high FeO content are then used as bottom material and subjected to high-temperature oxidation again, which can shorten the roasting time of the belt roaster. Attached Figure Description

[0022] Figure 1 This is a structural diagram of one embodiment of the present invention;

[0023] Figure 2 This is a structural diagram of a material distribution hopper according to an embodiment of the present invention.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Receiving hopper; 2. Vibrating feeder; 3. Magnetic separation assembly; 31. Belt pulley; 32. Magnetic pulley; 33. Magnetic separation belt; 4. Material distribution assembly; 41. Material distribution hopper; 42. Material distribution plate; 43. First discharge port; 44. Second discharge port; 5. First conveyor belt; 6. Second conveyor belt; 7. Bottom silo. Detailed Implementation

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] See also Figure 1-2 As shown in the embodiment of this application, a system for reducing FeO in belt roaster pellets includes: a receiving hopper 1, a vibrating feeder 2, a magnetic separation component 3, a distribution component 4, a first conveyor belt 5, a second conveyor belt 6, and a bottom material bin 7. The receiving hopper 1 is used to store materials and is connected to the feed inlet of the vibrating feeder 2. The magnetic separation component 3 is located below the vibrating feeder 2 and is used for conveying and magnetically separating materials. The distribution component 4 is located below the magnetic separation component 3 on the side away from the vibrating feeder 2 and can distribute the magnetically separated materials. The first conveyor belt 5 is located below the distribution component 4 and is used to convey the target product separated by the distribution component 4. The second conveyor belt 6 is located below the distribution component 4 and is used to convey the finished product separated by the distribution component 4. The bottom material bin 7 is located on one side of the first conveyor belt 5, and the first conveyor belt 5 feeds the target product into the bottom material bin 7 for use as bottom material in the belt roaster.

[0031] Specifically, after being roasted in a belt roaster, the pellets are cooled and unloaded from the belt roaster or screening machine, then placed into a receiving hopper 1 for storage. The pellets are then evenly fed into a magnetic separation assembly 3 via a vibrating feeder 2. The vibrating feeder 2 ensures more uniform material distribution on the magnetic separation assembly 3, improving the magnetic separation effect in subsequent processes. The magnetic separation assembly 3 performs magnetic separation, and the material is then separated by a distribution assembly 4. Target products with high FeO content fall onto the first conveyor belt 5 and are then fed into a bottom-laying hopper 7 for bottom-laying. Finished products with low FeO content, after passing through the magnetic separation assembly 3 and distribution assembly 4, enter the second conveyor belt 6, which transports them to the finished product hopper as finished product. Therefore, the FeO content in the final pellets can be reduced, thus improving the quality of the pellets. The high FeO content target products from magnetic separation are then used as bottom-laying material and subjected to high-temperature oxidation again in the belt roaster, which also shortens the roasting time of the belt roaster. This application selects the target product with high FeO content from the pellets after roasting in a belt roaster, and sends the finished product with low FeO content into the finished product silo. This reduces the FeO content in the final roasted pellets and improves their strength. The target product with high FeO content is then used as the bottom material and laid in the belt roaster for further high-temperature oxidation. Compared with the existing technology of directly screening and laying the bottom material, this method can shorten the roasting time of the belt roaster.

[0032] The magnetic separator 3 includes: a pulley 31, a magnetic pulley 32, and a magnetic separator belt 33;

[0033] The pulley 31 and the magnetic pulley 32 are mounted on the support. The magnetic pulley 32 is mounted on the side of the support away from the vibrating feeder 2. The magnetic separation belt 33 is sleeved on the outside of the pulley 31 and the magnetic pulley 32.

[0034] Specifically, the vibrating feeder 2 feeds the material onto the magnetic separation belt 33, which transports the material. At the same time, a pulley 31 is installed on the side of the magnetic separation belt 33 closest to the vibrating feeder 2, and a magnetic pulley 32 is installed on the side away from the vibrating feeder 2. The magnetic separation belt 33 can transport the material to the magnetic pulley 32 for magnetic separation, selecting materials with high FeO content. The operation is convenient.

[0035] The magnetic pulley 32 has a magnetic field strength of 5000gs-15000gs.

[0036] The magnetic field strength of magnetic pulley 32 is 10000gs.

[0037] Specifically, by setting the magnetic field strength of the magnetic pulley 32, a strong magnetic field can be used to select out pellets with high FeO content from the material.

[0038] The material distribution component 4 includes: a material distribution hopper 41, a material distribution plate 42, a first discharge port 43, and a second discharge port 44.

[0039] The material distribution hopper 41 is equipped with a material distribution plate 42. The bottom of the material distribution hopper 41 is provided with a first discharge port 43 and a second discharge port 44. The first discharge port 43 is located above the first conveyor belt 5, and the second discharge port 44 is located above the second conveyor belt 6.

[0040] Specifically, the material selected by the magnetic separator 3 enters the distribution hopper 41. The distribution plate 42 in the distribution hopper 41 separates the material with high FeO content from the material with low FeO content. The material with high FeO content, which is the target product, is discharged into the first conveyor belt 5 through the first discharge port 43. The first conveyor belt 5 transfers it to the bottom material bin 7. The material with low FeO content, which is the finished product, is fed into the second conveyor belt 6 through the second discharge port 44. The second conveyor belt 6 transfers it to the finished product bin. Since the material in the finished product bin has been selected by magnetic separation of the roughing component, which has already removed the material with high FeO content, the FeO content in the final pellet is reduced. The material with high FeO content is then used as bottom material and laid in the belt roaster for high-temperature oxidation again, which can also shorten the roasting time of the belt roaster.

[0041] The material distribution plate 42 is adjustablely installed inside the material distribution hopper 41. The angle of the material distribution plate 42 inside the material distribution hopper 41 can be adjusted according to the amount of base material to be laid, making it easy to operate and adapt to different needs.

[0042] The material distribution plate 42 is installed inside the material distribution hopper 41 by a pin. Both ends of the pin are fixed to the material distribution hopper 41 by bolts. After the angle of the material distribution plate 42 is adjusted, it can be fixed by bolts, which makes it convenient for the staff to adjust.

[0043] The axis of the material distribution plate 42 and the axis of the magnetic pulley 32 are in the same vertical plane.

[0044] The distance between the top of the material distribution plate 42 and the bottom of the magnetic pulley 32 is not less than 500mm.

[0045] Specifically, the material distribution plate 42 is installed inside the material distribution hopper 41, and the axis of the material distribution plate 42 and the axis of the magnetic pulley 32 are set in the same vertical plane, so that the material with high FeO content after magnetic separation can enter the first discharge port 43, and the material with low FeO content can enter the second discharge port 44.

[0046] This application also provides a method for reducing FeO in belt roaster pellets, using any of the above-mentioned systems for reducing FeO in belt roaster pellets, comprising the following steps:

[0047] Step 1: Unload the cooled pellets from the belt roaster or screening machine and put them into the receiving hopper 1 for storage; this facilitates the storage of materials.

[0048] Step 2: The vibrating feeder 2 feeds the material stored in the receiving hopper 1 onto the magnetic separation belt 33, improving the uniformity of the material feeding onto the magnetic separation belt 33 and improving the efficiency of subsequent magnetic separation. The magnetic separation belt 33 transports the material to the magnetic pulley 32, where it is magnetically separated.

[0049] Step 3: The material selected by the magnetic pulley 32 is fed into the distribution hopper 41 and distributed by the distribution plate 42. The target product with high FeO content selected by the magnetic pulley 32 is discharged through the first discharge port 43 and falls onto the first conveyor belt 5. The finished product with low FeO content selected by the magnetic pulley 32 is discharged through the second discharge port 44 and falls onto the second conveyor belt 6. The distribution plate 42 is adjustablely installed in the distribution hopper 41. The angle of the distribution plate 42 in the distribution hopper 41 can be adjusted according to the amount of bottom material to be laid, making it easy to operate and adapting to different needs.

[0050] Step 4: The first conveyor belt 5 feeds the target product, which has a high FeO content, into the bottom material bin 7 for use as bottom material in the belt roaster. It then undergoes high-temperature oxidation again, which can also shorten the roasting time of the belt roaster. The second conveyor belt 6 transports the finished product with low FeO content after magnetic separation to the finished product bin, thereby reducing the FeO content in the final pellets.

[0051] Example 1

[0052] Table 1

[0053]

[0054] Table 2

[0055]

[0056] Table 3

[0057]

[0058] Table 1 shows the results of multi-element analysis of the raw materials;

[0059] Table 2 shows the particle size distribution test results;

[0060] Table 3 shows the indicators for finished pellet ore;

[0061] As can be seen from the experimental data in Table 3, when the roasting time is the same for both concentrate A and concentrate B, the FeO content in the final pellets is reduced by 0.77% compared with the conventional process method, which is the screening of finished pellets, when the feed material is laid in the belt roaster using the process method of this application. The average compressive strength of each pellet is increased by 301 N, and the drum index is increased by 0.7%.

[0062] Example 2

[0063] Table 1

[0064]

[0065] Table 2

[0066]

[0067] Table 3

[0068]

[0069] Table 1 shows the results of multi-element analysis of the raw materials;

[0070] Table 2 shows the particle size distribution test results;

[0071] Table 3 shows the indicators for finished product pellets.

[0072] As can be seen from the experimental data in Table 3, when the roasting time of C concentrate is the same, compared with the conventional process method (i.e., the finished pellets after screening) when using the process method of this application to lay the bottom material in the belt roaster, the FeO content in the final pellets is reduced by 0.77%, the average compressive strength of each pellet is increased by 304 N, and the drum index is increased by 0.9%.

[0073] Example 3

[0074] Table 1

[0075]

[0076] Table 2

[0077]

[0078] Table 3

[0079]

[0080] Table 1 shows the results of multi-element analysis of the raw materials;

[0081] Table 2 shows the particle size distribution test results;

[0082] Table 3 shows the indicators for finished product pellets.

[0083] As can be seen from the experimental data in Table 3, when the roasting time is the same, the FeO content in the final pellets is reduced by 0.28%, the average compressive strength of each pellet is increased by 27 N, and the drum index is increased by 0.3% when using the process method of this application compared with the conventional process method, which is to lay the screened finished pellets as the bottom material in the belt roaster.

[0084] Example 4

[0085] Table 1

[0086]

[0087] Table 2

[0088]

[0089] Table 3

[0090]

[0091] Table 1 shows the results of multi-element analysis of the raw materials;

[0092] Table 2 shows the particle size distribution test results;

[0093] Table 3 shows the indicators for finished product pellets.

[0094] As can be seen from the experimental data in Table 3, when the same raw materials are used to produce pellets and all the indicators of the final pellets are similar, the roasting time can be shortened by 4 minutes by using the process of this application.

[0095] This application reduces the FeO content in the final pellets by selecting pellets with high FeO content from those roasted in a belt roaster and using those with low FeO content after magnetic separation as finished products. This improves the quality of the pellets. Furthermore, by using the selected pellets with high FeO content as a base material and then subjecting them to high-temperature oxidation again, the roasting time of the belt roaster can be shortened.

[0096] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A system for reducing FeO in pellets in a belt sintering machine, characterized by, The system for reducing FeO in pellets of a belt induration machine comprises a receiving hopper (1), a vibrating feeder (2), a magnetic separation assembly (3), a distributing assembly (4), a first conveying belt (5), a second conveying belt (6), and a bedding material bin (7). The receiving hopper (1) is used for storing the material discharged from the belt induration machine or the screening machine after the pellets are indurated by the belt induration machine and cooled. The magnetic separation assembly (3) is arranged below the vibrating feeder (2) and used for conveying and magnetically separating the material discharged from the belt induration machine or the screening machine after the pellets are indurated by the belt induration machine and cooled.

2. The system for reducing FeO in pellets in a traveling grate indurator according to claim 1, characterized in that, The distributing assembly (4) is arranged below the magnetic separation assembly (3) on the side away from the vibrating feeder (2) and capable of distributing the material after the magnetic separation. The first conveying belt (5) is arranged below the distributing assembly (4) and used for conveying the target product with a high FeO content distributed by the distributing assembly (4).

3. The system for reducing FeO in pellets in a traveling grate indurator according to claim 2, characterized in that, The second conveying belt (6) is arranged below the distributing assembly (4) and used for conveying the finished product with a low FeO content distributed by the distributing assembly (4).

4. The system for reducing FeO in pellets in a traveling grate indurator according to claim 3, characterized in that, The bedding material bin (7) is arranged on the side of the first conveying belt (5), and the target product is fed into the bedding material bin (7) by the first conveying belt (5) to be used as the bedding material of the belt induration machine.

5. The system for reducing FeO in pellets in a traveling grate indurator according to claim 4, characterized in that, The magnetic separation assembly (3) comprises a pulley (31), a magnetic pulley (32), and a magnetic separation belt (33). The pulley (31) and the magnetic pulley (32) are arranged on a support, and the magnetic pulley (32) is arranged on the side of the support away from the vibrating feeder (2).

6. The system for reducing FeO in pellets in a traveling grate indurator according to claim 5, characterized in that, The magnetic pulley (32) has a magnetic field strength of 5000 gs-15000 gs.

7. The system for reducing FeO in pellets in a strand burner according to claim 6, characterized in that, The magnetic pulley (32) has a magnetic field strength of 10000 gs.

8. A method of reducing FeO in pellets in a belt sintering machine, characterized by, The distributing assembly (4) comprises a distributing hopper (41), a distributing plate (42), a first discharge port (43), and a second discharge port (44). The distributing plate (42) is arranged in the distributing hopper (41), and the first discharge port (43) and the second discharge port (44) are arranged at the bottom of the distributing hopper (41). The axis of the distributing plate (42) is in the same vertical plane as the axis of the magnetic pulley (32). The distance between the uppermost end of the distributing plate (42) and the lowermost end of the magnetic pulley (32) is not less than 500 mm. The system for reducing FeO in pellets of a belt induration machine comprises the following steps: Step 1: The cooled pellets are discharged from the belt induration machine or the screening machine and stored in the receiving hopper (1). Step 2: The vibrating feeder (2) feeds the material stored in the receiving hopper (1) to the magnetic separation belt (33), and the magnetic separation belt (33) conveys the material and magnetically separates it by the magnetic pulley (32). Step 3, the selected material of the magnetic pulley (32) is fed into the distribution hopper (41), and is distributed through the distribution plate (42). The target product selected by the magnetic pulley (32) is discharged through the first discharge port (43) and falls onto the first conveying belt (5). The finished product selected by the magnetic pulley (32) is discharged through the second discharge port (44) and falls onto the second conveying belt (6). Step 4, the first conveying belt (5) feeds the target product into the bedding material bin (7) for the bedding material of the belt-type roaster. The second conveying belt (6) carries the finished product to the finished product bin.

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