JPS5820701B2 - Slag removal device for hot metal or molten steel in a ladle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for removing slag floating on molten metal such as hot metal or molten steel contained in a ladle.

In the ironmaking process, it is often necessary to remove slag floating on hot metal or molten steel, for example after in-ladle desulfurization or in-ladle refining of hot metal.

The conventional method for removing slag has been to tilt a ladle and scrape off the slag manually or with slag seeds.

In this method, since the planar shape of the ladle is circular, it is difficult to scrape out the slag completely, and the scraped slag is often scattered over a wide area, making it difficult to dispose of it.

Furthermore, a large amount of dust is generated when scraping the slag and processing the scraped slag, and a large-scale dust collector is required.

The purpose of the present invention is to eliminate such conventional drawbacks, and the purpose of the present invention is to detect the interface level between molten pig iron or molten steel and slag in advance (for example, by using a thermocouple thermometer), and then to build up the refractory to that level. The present invention relates to a device characterized in that slag is stored in a steel-like container coated with slag by submerging the top surface of the container.

The present invention will be explained in detail below with reference to the drawings.

Figures 1 and 2 are diagrams in which a steel container, its handling device, and a slag boundary level detection device according to the present invention are mounted on a wall crane; The latter is a diagram showing a state in which slag is being discharged from the container outside the ladle.

In the present invention, as shown in FIG. 1, a container 1 covered with a refractory material 1' is attached to a handling device mounted on a wall crane 5.

The interface level between the hot metal or molten steel and the slag can be detected by a detector having a thermocouple thermometer attached to the tip of the lance 11.

The container 1 has a T-shaped hanger 2 attached to it.

The handling device is a hydraulically or pneumatically driven cylinder4. It is driven by a witch 6.7, a guide mast 8, and a cylinder 4, and consists of a block 9 that moves up and down within the guide mast 8, a pipe 10 fixed to this block, and a guide cylinder 3.

First, the container 1 is gently moved by the cylinder 4 through the block 9 and the rod 3' which is guided to the guide cylinder 3 via the hanging tool 2 attached until the upper end of the container comes to the boundary surface level detected in advance by the lance 11. be pushed down.

The wires 6', 7' are lowered by the winch 6.7 following the movement of the T-shaped hanger 2.

In this process, the metal floating on the hot metal or molten steel A enters the container 1 without generating dust from the periphery of the container 1.

The diameter of the container 1 needs to be determined depending on the fluidity of the slag.
Generally, if the fluidity is poor, the diameter needs to be increased.

Further, the shape of the container is desirably close to a conical shape in order to reduce the required pressing force.

Next, the container 1 containing the slag is hoisted up by the winch 6.7.

The cylinder 4 follows this movement and is pulled up.

The hanging tool 2 and the pipe 10 have an appropriate fit and are in contact with each other to prevent the container 1 from tilting while the container 1 is being pushed down and rolled up.

However, the hanging tool 2 and the container 1 are rigidly fixed with bolts or bolts.

The container 1 taken out of the ladle is transported to a required location by a wall crane, and the slag is discharged into a slag pan 13, for example.

Discharge is carried out by first lowering both winches 6 and 7, removing the hooks 10 and 2, lowering winch 6, and tilting the container by raising winch 7.

The guide cylinder 3 does not need to be driven in particular, but only serves as a guide for the movement of the container 1 when the winch 6.7 is operated.

The device of the present invention can be used not only to remove slag from hot metal or molten steel in a ladle, but also to generally remove substances floating in fluid.

Furthermore, the detector that detects the interface between molten steel and slag can be made independent of the device of the present invention, or it can be mounted on a wall crane as shown in Figures 1 and 2, and the detector can be used to detect the interface between molten steel and slag. It is also effective to lower the container 1 by the drive cylinder 4 in accordance with the command.

[Brief explanation of drawings]

Figures 1 and 2 show examples of the present invention. Figure 1 shows the container 1 being pushed down into the pot and the floating slag is stored inside the container, and Figure 2 shows the container 1 being held outside the pot. It is a diagram showing a state in which slag is being discharged from a container. 1: Container, 1: Refractory, 2: Hanging tool, 3: Guide cylinder, 3: Rod, 4: Drive cylinder, 5: Wall crane, 6, 7: Winch, 6, 7: Wire, 8 guide mast, 9: Niblock, 10: Pipe, 11: Lance with built-in thermocouple thermometer, 12: Ladle, 13: Nislag pan.

Claims (1)

[Claims] 1. A guide mask is suspended from a transport device such as an overhead crane that travels at high places, and a block that moves up and down within the guide mask is installed via a drive device, and a guide cylinder and a pipe with a larger diameter than this cylinder are installed at the lower end of the block. The lower end of a rod that is fixedly installed concentrically and slides inside this guide cylinder is rotatably connected to the top of a T-shaped hanging tool via an axis, and this T-shaped hanging tool has a refractory attached to its lower end. A device for removing molten pig iron or slag from molten steel in a ladle, characterized in that a steel container coated with is fixed, and both left and right ears are connected by wires to respective winding devices mounted on the conveying device.