JPH0542381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for removing slag stuck to a receiving trough used, for example, when charging molten slag into a heating furnace.

[Conventional technology]

Molten slag generated in large quantities from blast furnaces is cooled and
After processing crushed stone, blast furnace cement, ground improvement material,
It is used as a component of concrete aggregate, etc. Furthermore, this blast furnace slag is also used as a raw material for rock wool, which is a high value-added product.

When using the conventional method of manufacturing rock wool from blast furnace slag, crushed stone slag is melted again in an electric furnace, cupola, etc. after a component adjustment material is added as necessary, and this is turned into fibers using an appropriate fluid pressure. was. However, when blast furnace slag is once cooled and crushed to solidify and then melted again, a large amount of energy is required to remelt it, resulting in a disadvantage in that the unit cost of producing rock wool becomes high.

Therefore, a method of producing rock wool that reduces energy consumption by directly charging blast furnace slag in a molten state into a heating furnace such as an electric furnace is attracting attention. Methods for producing rock wool from blast furnace slag in such a molten state include JP-A-59-189284, JP-A-59-131534,
There are Japanese Patent Application Laid-open No. 60-134186, etc.

[Problem to be solved by the invention]

However, molten slag is inherently highly viscous. Moreover, since the material is gradually introduced into a heating furnace such as an electric furnace, the temperature decreases during the charging process. As a result, slag tends to stick to the input port of the heating furnace, the receiving trough that guides the molten slag into the heating furnace, etc., and this sticking of slag becomes a hindrance to subsequent work.

On the other hand, slag stuck to various containers and the like has been removed by inverting the containers. This method is a simple removal method when there is a work space where the container can be turned over. However, when trying to apply this to a receiving gutter located above the heating furnace, a simple reversing mechanism cannot be adopted due to the positional relationship between the receiving gutter and the heating furnace. In other words, the receiving gutter should be placed high above the heating furnace, or the receiving gutter should be rotated horizontally to avoid the fixed slag discharged from the heating furnace from falling on the heating furnace. It is necessary to invert it in the space where it is created. Therefore, the drive mechanism required to move the receiving gutter becomes complicated.

Another possible method is to discharge the stuck slag in the receiving trough using input, mechanical force, etc., but when such a method is used, it is difficult to ensure that the stuck slag is completely discharged. Furthermore, personnel costs etc. cannot be ignored.

Therefore, an object of the present invention is to easily remove the slag stuck inside the receiving gutter by utilizing the adhesion state of the slag which is affected by the shape of the receiving gutter without using a particularly complicated drive mechanism. .

[Means to solve the problem]

In order to achieve the objective, the method for removing fixed slag of the present invention has the following advantages: Immediately before the end of the input work, the spout of the receiving gutter is closed by a stopper that is movable up and down, and after allowing the slag remaining in the receiving gutter to cool and solidify, the receiving gutter is moved by a rotational force from a drive mechanism. Then, by raising the stopper, the slag stuck to the inner wall of the receiving gutter is scraped off by the stopper's entire circumference scraper installed above the stopper, and the peeled slag is removed. is characterized by being discharged outside the receiving gutter by its own weight.

In addition, the molten slag receiving device used for this purpose has a molten slag receiving gutter for charging molten slag into the heating furnace that is tiltably arranged at the upper part of the heating furnace, and at least the lower inner surface of the receiving gutter is rounded and opened upward. A spout is formed in the shape and at the bottom, a stopper for opening and closing the spout is provided above the receiving gutter so as to be movable up and down in the vertical direction, and a scraper fixed to the receiving gutter is provided above the stopper. It is characterized by being arranged.

〔Example〕

Hereinafter, features of the present invention will be specifically explained with reference to embodiments shown in the drawings.

FIG. 1 shows a state in which the receiving trough used in the embodiment of the present invention is placed above an electric furnace serving as a heating furnace.
FIG. 2 is a plan view thereof.

The receiving gutter 1 is tiltably arranged above the electric furnace 2, as shown by the dashed line in FIG. In this example, the receiving gutter 1 is tilted by rotating a frame that supports and fixes the receiving gutter 1 using an electric drive mechanism 3 (see FIG. 2). Further, a stopper 5 is provided inside the receiving trough 1 so as to be movable up and down by a hydraulic cylinder 8 so as to close the spout 4 thereof.

In the example shown in FIG. 1, the tip of the stopper 5 is provided with a small diameter portion 6 whose diameter is suddenly tapered, so that the spout 4 can be instantly closed.
However, without providing such a small diameter portion 6,
It is also possible to use a so-called needle-type stopper 5 whose diameter is temporarily reduced, and in this case, it is possible to adjust the flow rate of slag flowing out from the spout 4 according to the vertical position of the stopper 5. Become.

Further, a cylindrical scraper 7 fixed to the receiving gutter 1 is provided above the stopper 5. The scraper 7 is located at a position higher than the molten slag level in the receiving trough during injection of molten slag, and its inner diameter is slightly larger than the outer diameter of the stopper (approximately 5 mm).
degree) and when the stopper 5 rises,
It has the function of scraping off stuck objects such as slag adhering to the stopper 5.

The receiving gutter 1 has a cross-sectional shape as shown in FIG. 3, for example. That is, the inner wall 1a is
The part that comes into contact with the slag is formed into a rounded shape that opens upward so that the slag can be easily peeled off. As a result, even if slag is not partially but completely adhered to the lower inner wall 1a of the receiving gutter 1, the slag is solidified on the adhesion surface, and the adhered slag can be peeled off all at once with uniform force. becomes possible.
Note that this receiving gutter 1 is made of cast steel such as SC42. Further, a flange 1b is formed around the spout 4, and by providing a separate sealing device (not shown) between the flange 1b and the electric furnace 2, the inlet of the electric furnace 2 can be closed. It becomes possible to seal. As a result, the graphite refractories that make up the heating parts such as the inner wall and electrodes of the electric furnace 2,
Oxidation caused by the atmosphere entering the electric furnace 2 is prevented.

Slag is charged into the receiving trough 1 from a container (not shown) such as a ladle car, and the slag is charged into the electric furnace 2 through the spout 4. The charging of slag into the electric furnace 2 takes time,
As charging progresses, the temperature of the slag decreases. For example, the temperature of slag, which is normally around 1350℃, drops to around 1300℃ at the end of charging. As the temperature decreases, the viscosity of the slag increases, making it easier for the slag to adhere to the inner wall 1a of the receiving gutter 1 and solidify. In this embodiment, the slag adhering to the inner wall 1a of the receiving gutter 1 is removed in the following manner.

That is, the spout 4 is closed with the stopper 5 while a small amount of molten slag remains in the receiving trough 1 at the end of charging. Then, the slag remaining around the stopper 5 is allowed to cool and solidify. At this time, the parts of the receiving trough where the slag is thin are rapidly cooled using metal fittings, so the slag naturally cracks even after solidification. However, since the slag around the stopper is thick, the slag, which has a low thermal conductivity, is slowly cooled and is cooled while enclosing the stopper.
On the other hand, the slag surface of the receiving gutter in the stopper part is made of metal and has been rapidly cooled to form a thin layer, so it has no adhesion to the metal and is easily peeled off due to contraction of the slag. Next, the drive mechanism 3 tilts the receiving gutter 1 at an angle of about 45 to 60 degrees to bring it into the state shown by the dashed line in FIG. Under this condition, the stopper 5 is raised. Then, due to the round shape of the receiving trough 1 that opens upward, the lifting force of the stopper 5 lifts up the slag that has adhered and solidified around the stopper 5. As a result, the slag is separated from the inner wall 1a of the receiving gutter 1. Furthermore, when the stopper 5 is raised, the slag adhering to the periphery of the stopper 5 is scraped off by the scraper 7 and peeled off from the stopper 5.

Since the receiving gutter 1 is maintained in an inclined state, the slag peeled off from the inner wall of the receiving gutter 1 and around the stopper 5 falls from the receiving gutter 1 and is placed in an appropriate receiving device (not shown). and transported to a collection point.

〔Effect of the invention〕

As explained above, in the present invention, the slag is peeled off from the inner wall of the receiving gutter by the lifting force of the stopper, and the slag adhering to the stopper is peeled off by the scraper. At this time, since the receiving gutter is maintained in an inclined state, the peeled slag is discharged to the outside of the receiving gutter due to its own weight. Thus, according to the present invention, slag can be removed with extremely simple operations and equipment. Moreover, since there is no need to turn the receiving gutter 180 degrees, the operation of a heating furnace such as an electric furnace will not be hindered, and the tilting operation of the receiving gutter will not be interfered with by the heating furnace. Therefore, it is possible to produce rock wool from molten slag under stable operating conditions without worrying about slag sticking.

[Brief explanation of drawings]

FIG. 1 shows an example in which the receiving gutter used in the embodiment of the present invention is arranged in the upper part of an electric furnace, FIG. 2 is a plan view thereof, and FIG. 3 is a cross-sectional view of the receiving gutter.

Claims (1)

[Scope of Claims] 1. When charging molten slag into a heating furnace through the bottom spout of a molten slag receiving trough whose lower inner surface is rounded and open upward, the molten slag receiving trough is opened immediately before the end of the charging operation. The spout is closed by a stopper disposed so as to be movable up and down, and after the slag remaining in the receiving gutter is left to cool and solidify, the receiving gutter is tilted by the rotational force of a drive mechanism and maintained in an inclined state. Then, by raising the stopper, the slag stuck to the inner wall of the receiving gutter is peeled off by a scraper that scrapes the entire circumference of the stopper installed above the stopper, and the peeled slag is discharged outside the receiving gutter by its own weight. A method for removing slag stuck to a molten slag gutter. 2. A molten slag receiving gutter for charging molten slag into the heating furnace is arranged so as to be tiltable, and at least the inner surface of the lower part of the receiving gutter is formed into a round shape that opens upward, and the receiving gutter is provided with a pouring port at the lowest part. A molten slag receiving device characterized in that a closing stopper is provided to be movable up and down in the vertical direction, and a scraper for scraping the entire circumference of the stopper is disposed above the stopper.