JPS598850Y2 - Slag removal device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sludge removal device for a molten metal processing vessel that aims to improve sludge removal efficiency and workability.

In recent years, there has been a call for a shift towards quality over quantity in steelmaking operations, and in particular the need to manufacture high-quality ultra-low sulfur steel has made the removal of sulfur S from molten steel an important technical issue in the steelmaking process. It is.

Conventionally, in-furnace desulfurization in a converter has been considered from the perspective of the blowing process, and expectations have been very low.The blow-off sulfur value after blow-off often exceeds the standard value, so re-blowing is required, resulting in disadvantages in terms of time and production. In addition, the type of steel had to be changed, which disrupted planned production and caused distortions in the production process.

Incidentally, the slag in molten steel is either soda ash or other desulfurization agent or slag after desulfurization treatment, and contains a large amount of sulfur S. In order to prevent resulfurization from this slag during converter blowing, this slag is Removing slag leads to removing sulfur in molten steel.

Therefore, in order to solve the above-mentioned problems, the best method is to remove the slag from the hot metal in the hot metal ladle at the time when the hot metal can be pretreated in the mixer or other hot metal ladle, that is, immediately before charging into the converter. Conventional sludge removal methods include scraping with a sludge scraper, but this has the disadvantage of poor sludge removal efficiency and is time-consuming.Also, the sludge is blown in by blowing nitrogen gas, and the sludge is scraped off by the operator. There are some, but they have the disadvantage of poor workability.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and effectively combines the slag scraping device and the inert gas blowing device such as nitrogen gas and Ar gas, which are rationally incorporated into the traveling trolley. The object of the present invention is to provide a sludge removal device that is designed to be used in combination to improve sludge removal efficiency and workability.

Hereinafter, one embodiment of this invention will be described in detail with reference to the accompanying drawings.

As shown in the figure, a pair of rails 3, 3 are laid on the work floor 2 on the side of the hot metal ladle 1, and wheels 4, . Arrange the trolley 5.

The work cart 5 has a flat loading platform portion 6 and a driver seat portion 7.
A worker rides on the driver's seat part 7 and controls the running of the work cart 5 itself, as well as a slag scraping device 8 and nitrogen gas, which will be described later, loaded on the platform part 6 and the driver's seat part 7 of the work cart 5. The blowing device 9 is controlled.

The slag scraping device 8 loaded on the loading platform 6 of the work truck 5 has a slag scraping plate support 10 installed on the loading platform 6 that is guided so as to be able to move parallel to the traveling direction of the truck. A long slag scraping arm 12 is provided with a slag scraping plate 11 supported at its tip for scraping slag S of hot metal F in the slag scraping arm 11,
The sludge scraping arm 12 is supported by a turning mechanism 13 provided on the sludge scraping plate support 10, and can be turned vertically and horizontally under control from the driver's seat portion 7.

The scraping plate 11 is designed to be replaceable with the scraping arm 12.

The nitrogen gas blowing device 9 loaded on the driver's seat part 7 of the work trolley 5 has a support arm 14 cantilevered on the upper part of the driver's seat part 7 that extends in the traveling direction of the trolley, while inside the hot metal ladle 1. Graphite immersion pipe for blowing nitrogen gas directly into the hot metal F 15. A nitrogen gas blowing pipe 16 is provided with a nitrogen gas blowing pipe 16 supported at the tip thereof, and the blowing pipe 16 is supported from the support arm 14 via a hanger 17, and is controlled by the driver's seat portion 7 in the traveling direction of the bogie. It is possible to move parallel to

In addition, the above-mentioned immersion pipe 15. A plurality of pipes 15 are arranged in parallel in a direction perpendicular to the running direction of the bogie, and can be raised and lowered and the interval can be changed by a raising/lowering/interval variable mechanism 18, and can be replaced with the nitrogen gas blowing pipe 16. .

To use the sludge removal device constructed as described above, the operator in the driver's seat section 7 moves the work cart 5 to the working position, controls the nitrogen gas blowing device 9 and the sludge scraping device 8, and Immersion pipe 15 of nitrogen gas blowing device 9. 15
Wave force (hereinafter referred to as pubbling) generated by blowing nitrogen gas at the back of the hot metal ladle 1.

) to hold the slag S in a position where it blows toward the pot mouth 1a, and to maintain the vertical height to the extent that the scraping plate 11 of the slag scraping device 8 does not scrape out the hot metal F. do.

Then, nitrogen gas is supplied from an external nitrogen gas supply source (not shown) to the nitrogen gas blowing pipe 16 through the supply hose 19, and is blown into the hot metal F from the immersion pipes 15, 15 at the tips. Pubbling, and this pubbling will result in
The slag S on the hot metal F moves toward the pot mouth 1a.

Then, when the slag scraping plate support 10 is moved in the traveling direction of the cart, the slag S is scraped out from the pot mouth 1 by the slag scraping plate 11.

In this case, the slag S is blown toward the pot mouth 1a side by the bubbling action of the nitrogen gas, so the amount of movement of the slag scraping plate 11 may be small, and moreover, a large amount of the slag S can be removed at once.

In the above-mentioned slag removal work, a plurality of immersion pipes 15,
15, the nitrogen gas blowing pipe 16 is moved back and forth along the support arm 14 according to the situation of the slag removal work, and even when the sludge removal is near the end, the slag S can be spread over a wide area by pubbling. The slag can be collected near the pot mouth 1a without being distributed to other areas, and can be quickly scraped out with the slag scraping plate 11.

In addition, according to the slag removal device according to this embodiment, the sludge removal rate is improved from 80% of the conventional method to 95%, and it can be done in 60% of the time. did it.

As is clear from the above explanation, this invention is based on installing a slag scraping plate support stand that movably supports a slag scraping arm having a slag scraping plate on a work cart, and also Since this sludge removal device is equipped with a support arm that movably supports the blowing pipe, the bubbling effect of inert gas allows for efficient sludge removal work with minimal movement of the sludge scraper. , immersion pipes, etc. can be controlled remotely, so they have various advantages such as further improved workability, and are of great practical value.

[Brief explanation of drawings]

The figure is a schematic explanatory diagram of a slag removal device according to this invention. 1...Hot metal pot, 2...Working floor, 3...Rules, 5
... Working trolley, 8... Slag scraping device, 9... Nitrogen gas blowing device, 10... Slag scraping plate support stand, F... Hot metal, S... Slag, 11... Slag scraping plate, 12... Slag scraping arm, 13... Swivel mechanism, 14... Support arm, 15
．． 15...Immersion pipe, 16...Nitrogen gas blowing pipe, 18...Elevating/lowering/interval variable mechanism.

Claims (1)

[Scope of utility model registration request] (1) A movable work trolley is placed on the work floor on the side of the molten metal processor, and a slag scraping board support stand that is movable in the running direction of the trolley is installed on the work trolley. The support base supports the slag dissemination arm, which supports a replaceable slag scraping plate at the tip, so as to be able to rotate vertically and horizontally.
A support arm extending in the running direction of the trolley is installed on the work trolley, and the support arm supports an inert gas pipe with multiple replaceable immersion pipes that can be raised and lowered and whose spacing is variable. The blowing pipe is supported so as to be movable in the traveling direction of the trolley, and the immersion pipe is always set at the back of the container with respect to the container, and when the involous gas is blown into the container, the immersion pipe is set at the back of the container. Did you blow the slag near the mouth of the vessel and scrape it out with the slag scraping board mentioned above? A slag removal device.