Device for recycling scattered slag under converter

Abstract

The utility model discloses a device for recycling scattered slag under a converter, which belongs to the technical field of steel production and comprises a retaining wall, a steel sieve and a driving device. And a blanking area is defined by the retaining wall. One end of the steel screen is hinged to the retaining wall and arranged on the top of the blanking area. The driving device is used for driving the steel screen to rotate. According to the recovery device, large steel slag blocks in bulk furnace slag with high iron content and furnace slag particles with high iron content can be screened out on a production site according to needs through the steel screen. Steel slag blocks in bulk slag under the converter with higher iron content can be added into the converter along with the waste steel through a waste steel hopper; under-furnace scattered slag particles with high iron content are conveyed to the high-level bunker of the converter through the feeding system and added into the converter from the high-level bunker of the converter as required, the under-furnace scattered slag particles can be added as required when the slag is returned to be dry, iron elements in the under-furnace scattered slag can be recycled, and consumption of steel and iron materials of the converter is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of steel production, and particularly relates to a device for recycling converter under-furnace scattered slag. BACKGROUND

[0002] In steel production, metal loss caused by converter spattering is 0.5% to 5%, and even more than 10% in severe spattering, which brings great steel material consumption to the converter. In the early stage of converter blowing, the temperature is low, the temperature rising speed is slow, and the temperature is below 1470 DEG C for a long time, which is more likely to cause FeO aggregation in the slag. With the increase of the temperature of the molten pool, the mass fraction of FeO in the slag reaches more than 20%, the carbon-oxygen reaction is carried out violently, a large amount of CO gas flow is formed instantaneously, and high FeO (the mass fraction can reach 20%-30%) and low alkalinity (1.4-1.6) slag provide good conditions for spattering, and metal liquid drops and high FeO slag mixture spurt out with CO. It is found through research that the terminal carbon is 0.03% to 0.04%, and the average terminal slag FeO mass fraction reaches 28.42%. Through research and analysis, the total iron content of the under-furnace scattered slag also reaches more than 20%, and contains spattered furnace mouth and cap slag, scattered scrap steel, metal iron particles and the like, recycling the under-furnace scattered slag can be used as a converter fluxing agent, slagging agent and coolant, and the iron element in the slag can be recycled to reduce the steel material consumption and loss.

[0003] At present, the converter under-furnace scattered slag is generally sent to the environmental protection recycling process together with the liquid terminal slag of the converter for recycling through a complex process, the process flow is long, and the steel material consumption cost of the steel plant is increased. In some actual operations, the converter under-furnace scattered slag is directly spaded into a scrap steel bucket with a forklift after electromagnetic preliminary selection or is directly spaded into the converter with the scrap steel, which causes large slag quantity, low temperature and high FeO content in the early stage of the converter, and is easy to cause secondary spattering, which is not worth the loss. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a device for recycling converter under-furnace scattered slag to solve the problems in the prior art.

[0005] The utility model provides a device for recycling converter under-furnace scattered slag, which comprises:

[0006] A retaining wall is arranged to form a falling area.

[0007] A steel sieve is hingedly connected to one end of the retaining wall and arranged at the top of the falling area.

[0008] A driving device is arranged to drive the steel sieve to rotate.

[0009] Through the design, effective screening and recycling of the converter under the scattered slag can be realized. The slag particles with high iron content in the under-converter scattered slag are filtered from the screen holes of the steel screen to the material falling area, and the rotation of the steel screen can dump and discharge the steel slag blocks in the high-iron-content large block under-converter scattered slag after completing the material screening, facilitating subsequent classification processing and utilization.

[0010] Further, the driving device is a hydraulic cylinder, the hinged end of the steel screen extends away from the retaining wall, and one end of the driving device is hinged to the retaining wall and the other end is hinged to the extended section of the steel screen. The hydraulic cylinder as the driving device can provide stable power to ensure smooth rotation of the steel screen. The extension design of the steel screen enables the driving device to more effectively transmit power, improving the operating efficiency and stability of the device.

[0011] Further, the side wall of the retaining wall is provided with a stopper, and the stopper is provided with a locking device matched with the steel screen. The stopper supports and limits the free end of the steel screen, and the locking device can fix the position of the steel screen to prevent the steel screen from swinging when subjected to material impact, reduce the impact on the driving device, and ensure the safety and stability of the device.

[0012] Further, it further comprises an electromagnetic suction disc for absorbing materials. The electromagnetic suction disc can be used to transport the scattered slag from the converter under the furnace to the top of the steel screen, and can also re-adsorb the scattered slag after the steel screen is screened once and then fall down, thereby destroying the aggregation state of the scattered slag to achieve multiple screening, which is beneficial to the complete classification and filtration of the scattered slag and reduces the powder carried into the slag block with scrap steel.

[0013] Further, dust removal devices are arranged around the retaining wall. The dust removal devices can effectively reduce the dust generated during the processing of the scattered slag, improve the working environment, reduce the health hazards to the surrounding personnel, and also meet the environmental protection requirements.

[0014] Further, the side wall of the retaining wall is provided with a discharge port, the steel screen is hinged to the discharge port position on the retaining wall, and the dust removal device is arranged along the circumference of the retaining wall at the input port position of the material falling area. The scattered slag is discharged through the discharge port, and the retaining wall part above the discharge port can raise the height of the dust retaining structure, which is beneficial to limiting the dust within the area range of the retaining ring. The dust removal device can be arranged around the retaining wall to increase the dust removal surface and improve the dust removal effect.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] The recycling device uses a steel screen to separate large pieces of steel slag with high iron content and small particles of slag with moderate iron content from the bulk slag at the production site, as needed. The large pieces of steel slag with high iron content can be added to the converter along with the scrap steel through the scrap hopper. The small particles of slag with moderate iron content are transported to the high-level silo of the converter via the feeding system and added to the converter as needed. These particles can be used as a fluxing agent during slag "return drying" and can also be used to recover iron from the bulk slag, reducing the consumption of steel materials in the converter. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of the device for recycling the loose slag under the converter furnace;

[0019] Figure 2 Schematic diagram B of the overall structure of the device for recycling the loose slag under the converter furnace.

[0020] In the diagram: 1. Retaining wall; 11. Material drop area; 12. Stop block; 13. Locking device; 14. Discharge port; 2. Steel screen; 3. Drive device; 4. Electromagnetic chuck; 5. Dust removal device. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0022] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0023] However, there may be instances where unnecessary detailed descriptions are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of essentially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0024] Please see Figure 1 As shown in the embodiment of this utility model, a device for recycling slag from the bottom of a converter includes a retaining wall 1, a steel screen 2, and a driving device 3. The retaining wall 1 forms a material dropping area 11. One end of the steel screen 2 is hinged to the retaining wall 1 and is located at the top of the material dropping area 11. The driving device 3 is used to drive the steel screen 2 to rotate.

[0025] The retaining wall 1 is constructed on all four sides. A slag collection device, a loader, or a loader can be placed beneath the retaining wall 1 to collect the loose slag particles into the converter's high-level silo feeding system. The steel screen 2 is covered with screen holes. Slag particles with a high iron content fall through the mesh of the steel screen 2 into the feeding area 11, becoming undersize material. The particle size of the undersize slag particles can be controlled between 0mm and 80mm. This material can be transported to the converter's high-level silo via the feeding system and added to the converter as needed. After the loose slag particles are screened, the drive device 3 drives the steel screen 2 to rotate. The rotation of the steel screen 2 causes large pieces of steel slag with a high iron content to be dumped and discharged.

[0026] The drive unit 3 used to rotate the steel screen 2 can be a hydraulic cylinder or an electric motor. Since the steel screen 2 can bear a load of over 5 tons, using a hydraulic cylinder as the drive source can provide greater torque and stability. When the drive unit 3 is a hydraulic cylinder, the output shaft of the hydraulic cylinder retracts, causing the steel screen 2 to rotate around the hinge, and the steel screen 2 is in an inclined state. When the output shaft of the hydraulic cylinder extends, the steel screen 2 returns to a flat state. The extended section of the steel screen 2 provides sufficient lever arm for the hydraulic cylinder, optimizing the force distribution and avoiding dead points in the force application.

[0027] When the steel screen 2 is in a horizontal screening state, the stop block 12 on the side wall of the retaining wall 1 forms a support point to withstand the weight of the steel screen 2 and the impact of falling slag. The locking device 13 is used to lock the steel screen 2 after it comes into contact with the stop block 12, preventing the steel screen 2 from swinging when subjected to material impact and reducing the impact on the drive device 3. The locking device 13 can be engaged with the steel screen 2 using a locking hook or a pin to limit the movement of the steel screen 2.

[0028] The recycling device uses an electromagnetic chuck 4 to adsorb materials. The electromagnetic chuck 4 uses an energized coil to create a magnetic field to adsorb loose slag. The electromagnetic chuck 4 transports the loose slag from the bottom of the converter to the top of the steel screen 2. After the power is turned off, the loose slag naturally falls onto the steel screen 2. After the steel screen 2 completes one screening, the electromagnetic chuck 4 is re-energized to adsorb loose slag, and then disconnected and falls, breaking the aggregated state of the loose slag. The electromagnetic chuck 4 not only realizes the automated transportation of loose slag, but also, through multiple adsorption and falling operations, fully disperses the loose slag, improving screening efficiency. Due to the large size and weight of the steel screen 2, it is difficult to implement vibration screening to improve the screening effect, and vibration screening can easily damage the component structure.

[0029] A dust removal device 5 is installed around the retaining wall 1. The dust removal device 5 is activated during the slag handling process to absorb and treat the generated dust.

[0030] Further, please refer to Figure 2 As shown, a discharge port 14 is provided on the side wall of the retaining wall 1. The steel screen 2 is hinged to the discharge port 14 on the retaining wall 1. The dust removal device 5 is arranged around the retaining wall 1 at the input port of the material drop area 11. The discharge port 14 facilitates the smooth discharge of the slag after screening, and the raised dust-retaining structure confines the dust within the area of ​​the retaining wall 1, reducing dust overflow. The dust removal device 5 is arranged around the retaining wall 1, increasing the dust removal area and further improving the dust removal effect, ensuring a clean and safe working environment. The dust removal device 5 can be a box-shaped cavity structure continuously arranged around the retaining wall 1, with several dust suction ports and an internal fan to generate negative pressure.

[0031] The overhead crane, powered by electromagnetic chuck 4, lifts the loose slag from under the furnace to a position 0.5m to 1.5m above the steel screen 2. The dust removal device 5 is activated, and the electromagnetic chuck 4 is de-energized, shutting off the magnetic field. The loose slag falls onto the steel screen 2. Larger pieces of steel slag with higher iron content remain on the steel screen 2 as oversize, while smaller pieces of slag with lower iron content fall through the mesh of the steel screen 2 as undersize. After accumulating to a certain extent, the steel screen 2 is rotated, dumping the oversize to a slag yard. Larger pieces of steel slag can be added to the converter along with scrap steel via the scrap hopper, at a rate of 5kg / t to 20kg / t per furnace. The undersize slag particles can be transported to the converter's high-level silo via the feeding system and added to the converter as needed, at a rate of 2.5kg / t to 12kg / t per furnace.

[0032] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A device for recycling loose slag from the bottom of a converter furnace, characterized in that, include: A retaining wall (1) is provided to enclose a material drop area (11); A steel screen (2), one end of which is hinged to the retaining wall (1) and set at the top of the material drop area (11); A drive device (3) is used to drive the steel screen (2) to rotate.

2. The device for recycling and utilizing slag from the bottom of a converter as described in claim 1, characterized in that, The driving device (3) is a hydraulic cylinder. The hinged end of the steel screen (2) extends away from the retaining wall (1). One end of the driving device (3) is hinged to the retaining wall (1) and the other end is hinged to the extension section of the steel screen (2).

3. The device for recycling and utilizing slag from the bottom of a converter as described in claim 1, characterized in that, The retaining wall (1) is provided with a stop block (12) on its side wall, and the stop block (12) is provided with a locking device (13) that cooperates with the steel screen (2).

4. The device for recycling and utilizing slag from the bottom of a converter as described in claim 1, characterized in that, It also includes an electromagnetic chuck (4) for adsorbing materials.

5. The device for recycling and utilizing slag from the bottom of a converter according to claim 1, characterized in that, A dust removal device (5) is provided around the retaining wall (1).

6. The device for recycling and utilizing slag from the bottom of a converter according to claim 5, characterized in that, The side wall of the retaining wall (1) is provided with a discharge port (14), the steel screen (2) is hinged to the discharge port (14) on the retaining wall (1), and the dust removal device (5) is arranged around the retaining wall (1) at the input port position of the material drop area (11).

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