Method for cleaning steel slag under converter

Abstract

The method comprises the following cleaning steps that a first slag pit located at the slag receiving position and a second slag pit located at the steel tapping position are manufactured on the inner side of a rail below the converter; and during tapping, the buggy ladle is still above the second slag pit, the second slag pit is used for receiving molten steel splashed during pouring of the molten steel, and the second slag pit is used for receiving the molten steel when the steel ladle penetrates through the steel and leaks. The method comprises the following steps of: manufacturing a first slag pit for temporarily storing steel slag and a second slag pit for a molten steel accident at a steel tapping position and a slag receiving position at two sides below the converter based on the condition that the space below the small and medium-sized converter and the foundation are narrow; and then the slag is intensively shoveled and transported to a slag span slag braising pool through a loader, so that the carrying load of a slag car is reduced, and the purpose of stable production is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of molten steel smelting, and in particular to a method for cleaning steel slag under a converter. Background Art

[0002] Converter is a type of steelmaking furnace. It generally refers to a cylindrical oxygen-blowing steelmaking vessel that can be tilted. The furnace body is cylindrical and is mounted on a horizontal axis frame and can rotate. It is also used for steelmaking.

[0003] The converter is the core facility for molten steel smelting. During the smelting process, about 10% of slag will be produced, which will be poured into a special slag basin under the furnace and transported to the slag treatment plant for secondary treatment and recycling. As we all know, the basic track gauge of the slag ladle track of small and medium-sized 60-ton converters is small. Due to the influence of molten iron coefficient and scrap steel, the converter is prone to splashing. A large amount of high-temperature slag is scattered on the slag track under the furnace. The double-car production process frequently moves back and forth, which seriously endangers the safe operation of the double-car under the furnace. In the past, the slag scraping resistance of the slag ladle car was large and easy to be damaged, and the dust was serious. If a ladle leaked, the wheels and rails of the ladle car would be cast, which would cause extremely difficult handling.

[0004] In order to solve the above problems, the inventors proposed a method for cleaning the steel slag under the converter, which effectively solved the problem of cleaning the steel slag under the converter. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a method for cleaning slag under a converter, which effectively solves the problem of cleaning slag under the converter and avoids the adverse effects of molten steel on wheels and rails when the ladle leaks.

[0006] The present invention is achieved through the following technical solution, and provides a method for cleaning slag under a converter, comprising the following cleaning steps:

[0007] (1) A first slag pit located at the slag receiving position and a second slag pit located at the steel tapping position are made on the inner side of the rail under the furnace;

[0008] (2) When tapping steel, the ladle car is stationary above the second slag pit, and the second slag pit is used to receive the splashed molten steel when the molten steel is poured, thereby reducing the impact of the slag formed by the splashed molten steel on the movement of the ladle car and the slag ladle car. When the ladle leaks, the second slag pit is used to receive the molten steel to prevent the leaked molten steel from casting on the wheels and rails of the ladle car, which greatly reduces the difficulty of post-accident handling, shortens the accident handling time to the greatest extent, and provides a guarantee for the continuous production;

[0009] (3) When discharging slag, pour the slag into a slag ladle car stationary above the first slag pit or pour the slag directly into the first slag pit; when the ladle car is not working, pour the slag into the slag ladle car stationary above the first slag pit, and use the working interval of the ladle car to transport the slag out. When the ladle car is transporting molten steel, pour the slag directly into the first slag pit, and use the first slag pit to pre-store the slag, so that the rhythm of slag cleaning is effectively alleviated, thereby ensuring stable production operation;

[0010] (4) During the movement of the slag ladle car, the slag directly below the converter is scraped to the first slag pit by the slag scraper installed on the slag ladle car, which greatly shortens the scraping distance of the slag scraper, greatly reduces the walking resistance of the slag ladle car, improves the stability of slag transportation, and provides a guarantee for safe production;

[0011] (5) When the volume of steel slag in the first slag pit is greater than or equal to 4 / 5 of the volume of the first slag pit, the first slag pit is cleaned by a loader. When the furnace is shut down, the steel slag in the second slag pit is cleaned. The loader centrally shovels the steel slag in the first slag pit to the slag span slag pool, thereby reducing the carrying load of the slag truck and achieving the purpose of stabilizing production. When the furnace is shut down, the steel slag in the second slag pit is cleaned, which does not affect normal production and ensures the use function of the second slag pit.

[0012] Preferably, the pit bottom and pit sidewalls of the first slag pit and the second slag pit are both provided with steel plates with a thickness of 22 to 30 mm, and the steel plates are provided with embedded steel bars extending into the track installation foundation, and the embedded steel bars are welded to the steel plates. This optimization scheme facilitates the cleaning of steel slag or molten steel in the slag pit by arranging a steel plate with a thickness of 22 to 30 mm in the slag pit, avoiding direct contact between the steel slag and the molten steel and the track installation foundation, thereby avoiding pollution of groundwater, and fixing the steel plate by embedded steel bars, thereby improving the stability of the steel plate and avoiding displacement of the steel plate.

[0013] Preferably, the end of the embedded steel bar away from the track installation foundation is flush with the steel plate, and a welding groove is provided on the steel plate. This optimization scheme sets the embedded steel bar and the steel plate to be flush, avoiding the presence of a raised part that obstructs the loader bucket, making the slag cleaning more thorough, and also preventing the fixation of the steel plate from being damaged by the loader. By setting the groove, the welding is more solid, and the fixation of the embedded steel bar to the steel plate is more reliable.

[0014] Preferably, the depth of the first slag pit is 800-900 mm, the angles between the pit side walls at both ends of the first slag pit along the extension direction of the furnace rail and the vertical plane are 45°-50°, and the upper opening size of the first slag pit is larger than the lower opening size.

[0015] Preferably, the depth of the second slag pit is 500-600 mm, the angle between the pit sidewalls at both ends of the second slag pit along the extension direction of the furnace rail and the vertical plane is 45°-50°, and the upper opening size of the second slag pit is larger than the lower opening size. The depth setting of the first slag pit and the second slag pit in this optimization scheme meets the temporary storage requirements of steel slag and accidental leaked molten steel, respectively. The sidewalls at the front and rear ends of the first slag pit and the second slag pit are tilted, and the upper opening size of the second slag pit is set to be larger than the lower opening size, which is convenient for cleaning by a loader.

[0016] Preferably, the upper opening size of the first slag pit and the second slag pit is 2500mm×5000mm. The size setting of this optimization solution avoids affecting the rails under the furnace and facilitates the entry and exit of the loader bucket.

[0017] Preferably, the gap between the steel plate and the track installation foundation, and the gap between the steel plate and the ground foundation are both grouting. This optimization scheme grouting the gap between the steel plate and the foundation further improves the stability of the steel plate fixation.

[0018] The beneficial effects of the present invention are:

[0019] Based on the narrow space and foundation under the furnace of small and medium-sized converters, a first slag pit for temporary storage of slag and a second slag pit for molten steel accidents are made at the steel tapping position and slag receiving position on both sides of the converter. When operating the slag car, the slag is first pushed to the temporary storage pit, and then the loader is used to shovel and transport it to the slag span slag pool, thereby reducing the carrying load of the slag car and achieving the purpose of stable production. The structure involved is simple and the cleaning is convenient and quick, so that there is no slag in the entire area below the converter, which provides effective guarantee for the clean production of the converter, the safe and smooth movement of the two cars under the furnace, reduces the labor intensity of workers, and saves maintenance costs and resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the present invention;

[0021] As shown in the figure:

[0022] 1. Converter, 2. Slag ladle car, 3. First slag pit, 4. Second slag pit, 5. Ladle car. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0024] like Figure 1 As shown, the present invention provides a method for cleaning slag under a converter, comprising the following cleaning steps:

[0025] (1) A first slag pit 3 located at a slag receiving position and a second slag pit 4 located at a steel tapping position are formed on the inner side of a lower rail of a converter 1;

[0026] (2) When steel is being tapped, the ladle car 5 is stationary above the second slag pit 4, and the second slag pit 4 is used to receive the molten steel splashed during the pouring of the molten steel, thereby reducing the impact of the slag formed by the splashing molten steel on the movement of the ladle car 5 and the slag ladle car 2. When the ladle leaks, the second slag pit 4 is used to receive the molten steel to prevent the leaked molten steel from casting on the wheels and rails of the ladle car 5, thereby greatly reducing the difficulty of handling after the accident, shortening the accident handling time to the greatest extent, and providing a guarantee for the continuous production;

[0027] (3) When discharging slag, the slag is poured into the slag ladle car 2 stationary above the first slag pit 3 or directly into the first slag pit 3; when the ladle car 5 is not working, the slag is poured into the slag ladle car 2 stationary above the first slag pit 3, and the slag ladle car 2 transports the slag out during the working interval of the ladle car 5. When the ladle car 5 transports molten steel, the slag is directly poured into the first slag pit 3. The first slag pit 3 is used to pre-store the slag, so that the rhythm of slag cleaning is effectively alleviated, thereby ensuring stable production operation;

[0028] (4) During the movement of the slag ladle car 2, the slag directly below the converter is scraped to the first slag pit 3 by the slag scraper installed on the slag ladle car 2, which greatly shortens the scraping distance of the slag scraper, greatly reduces the walking resistance of the slag ladle car 2, improves the stability of slag transportation, and provides a guarantee for safe production;

[0029] (5) When the volume of the steel slag in the first slag pit 3 is greater than or equal to 4 / 5 of the volume of the first slag pit 3, the first slag pit 3 is cleaned by a loader. When the furnace is shut down, the steel slag in the second slag pit 4 is cleaned. The loader centrally shovels the steel slag in the first slag pit 3 to the slag span slag pool, thereby reducing the carrying load of the slag bag car 2 and achieving the purpose of stabilizing production. When the furnace is shut down, the steel slag in the second slag pit 4 is cleaned, which does not affect normal production and ensures the use function of the second slag pit 4.

[0030] The pit bottom and pit sidewalls of the first slag pit 3 and the second slag pit 4 are both provided with steel plates with a thickness of 22 to 30 mm, and the steel plates are penetrated with embedded steel bars extending into the track installation foundation, and the embedded steel bars are welded to the steel plates. This optimization scheme facilitates the cleaning of steel slag or molten steel in the slag pit by setting a steel plate with a thickness of 22 to 30 mm in the slag pit, avoiding direct contact between steel slag and molten steel and the track installation foundation, thereby avoiding pollution of groundwater, and fixing the steel plate by embedded steel bars, thereby improving the stability of the steel plate and preventing the steel plate from shifting.

[0031] The end of the embedded steel bar away from the track installation foundation is flush with the steel plate, and a welding groove is opened on the steel plate. This optimization scheme sets the embedded steel bar and the steel plate to be flush, avoiding the bulge from obstructing the loader bucket, making the slag cleaning more thorough, and also preventing the steel plate from being damaged by the loader. By setting the groove, the welding is more solid, and the anchoring of the steel plate to the embedded steel bar is more reliable.

[0032] The depth of the first slag pit 3 is 800-900 mm, the angles between the pit side walls at both ends of the first slag pit 3 along the extension direction of the furnace rail and the vertical plane are 45°-50°, and the upper opening size of the first slag pit 3 is larger than the lower opening size.

[0033] The depth of the second slag pit 4 is 500-600mm, the angle between the pit sidewalls at both ends of the second slag pit 4 along the extension direction of the rail under the furnace and the vertical plane is 45°-50°, and the upper opening size of the second slag pit 4 is larger than the lower opening size. The depth setting of the first slag pit 3 and the second slag pit 4 in this optimization scheme meets the temporary storage requirements of steel slag and accidental leaked molten steel, respectively, and the sidewalls at the front and rear ends of the first slag pit 3 and the second slag pit 4 are tilted, and the upper opening size of the second slag pit 4 is set to be larger than the lower opening size, so as to facilitate cleaning by a loader.

[0034] The upper opening size of the first slag pit 3 and the second slag pit 4 is 2500mm×5000mm. The size setting of this optimization scheme avoids the impact on the rails under the furnace and facilitates the entry and exit of the loader bucket.

[0035] The gap between the steel plate and the track installation foundation, as well as the gap between the steel plate and the ground foundation, are grouting. This optimization scheme grouting the gap between the steel plate and the foundation further improves the stability of the steel plate fixation.

[0036] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for cleaning slag under a converter, characterized in that: The cleanup steps include: (1) A first slag pit located at the slag receiving position and a second slag pit located at the steel tapping position are made on the inner side of the rail under the furnace; (2) When tapping steel, the ladle car is stationary above the second slag pit, and the second slag pit is used to receive the molten steel splashed when the molten steel is poured. When the ladle leaks, the second slag pit is used to receive the molten steel; (3) When discharging slag, pour the slag into a slag ladle car stationary above the first slag pit or directly pour the slag into the first slag pit; when the ladle car is not working, pour the slag into the slag ladle car stationary above the first slag pit, and use the working interval of the ladle car to transport the slag out. When the ladle car is transporting molten steel, pour the slag directly into the first slag pit, and use the first slag pit to pre-store the slag; (4) During the movement of the slag ladle car, the slag directly below the converter is scraped to the first slag pit by a slag scraper installed on the slag ladle car; (5) When the volume of steel slag in the first slag pit is greater than or equal to 4 / 5 of the volume of the first slag pit, use a loader to clean the first slag pit, and when the furnace is shut down, clean the steel slag in the second slag pit; use the loader to shovel the steel slag in the first slag pit to the slag span slag pool, and when the furnace is shut down, clean the steel slag in the second slag pit.

2. The method for cleaning slag under a converter according to claim 1, characterized in that: The pit bottoms and pit side walls of the first slag pit and the second slag pit are both provided with steel plates with a thickness of 22 to 30 mm. The steel plates are penetrated with embedded rebars extending into the track installation foundation, and the embedded rebars are welded to the steel plates.

3. The method for cleaning slag under a converter according to claim 2, characterized in that: The end of the embedded reinforcement away from the track installation foundation is flush with the steel plate, and a welding groove is opened on the steel plate.

4. The method for cleaning slag under a converter according to claim 3, characterized in that: The depth of the first slag pit is 800-900 mm, the angles between the pit side walls at both ends of the first slag pit along the extension direction of the under-furnace rail and the vertical plane are 45°-50°, and the upper opening size of the first slag pit is larger than the lower opening size.

5. The method for cleaning slag under a converter according to claim 4, characterized in that: The depth of the second slag pit is 500-600 mm, the angles between the pit side walls at both ends of the second slag pit along the extension direction of the under-furnace rail and the vertical plane are 45°-50°, and the upper opening size of the second slag pit is larger than the lower opening size.

6. The method for cleaning slag under a converter according to claim 5, characterized in that: The upper opening dimensions of the first slag pit and the second slag pit are both 2500mm×5000mm.

7. The method for cleaning slag under a converter according to claim 3, characterized in that: The gaps between the steel plate and the track installation foundation, as well as the gaps between the steel plate and the ground foundation are all grouting-cast.

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