JPH02163309A - Method for repairing lining refractory in torpedo car - Google Patents

Abstract

PURPOSE:To easily repair lining refractory brick in a torpedo car by charging castable refractory into the high temp. torpedo car discharging molten iron and molten slag and slowly rotating furnace body of the torpedo car after closing molten iron receiving hole. CONSTITUTION:In the case, the lining refractory brick in a vessel 2 for molten iron in the torpedo car 1 for receiving the molten iron from a blast furnace and executing refining of desulfurizing to the molten iron by charging pre- refining agent of desulfurizing agent, etc., after perfectly discharging the molten iron and molten slag in the vessel 2, the castable refractory 8 is charged in the vessel 2 and the molten iron receiving hole 6 is perfectly closed with a cover body 7, and the vessel 2 is slowly rotated with a tilting device 5. The damage part of the lining refractory is coated with the castable refractory charged in the vessel 2 and dried and burnt with the holding heat in the vessel 2 itself. Without cooling the vessel and coming in the vessel with the worker, the damaged lining refractory is repaired by utilizing the self holding heat under saving labor for short time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for repairing the refractory lining of a mixed pig iron car, and more particularly to a method of repairing the refractory lining of a mixed pig iron car in a hot state.

BACKGROUND OF THE INVENTION As is well known, a conventional pig iron mixing car is a molten metal container equipped with a conveyor truck for transporting hot metal from a blast furnace into a steelmaking furnace. In recent years, so-called ex-furnace desulfurization, in which hot metal is desulfurized after it is tapped in a blast furnace and before it is loaded into a steelmaking furnace, has become more common, and the proportion of desulfurization performed in pig iron mixers has increased. As a result, local damage to the refractory lining of the pig iron mixer car occurs frequently, and it is necessary to carry out local repairs intermediately between major repairs that basically repair the refractory material of the pig iron mixer car.

The above-mentioned intermediate repair method for the refractory lining of the conventional molten metal container furnace of a pig iron mixer car involves loading molten pig iron and cooling the inside of the pig iron car furnace, which has been in a high temperature state, and then a worker enters the furnace. The repaired area is dismantled, debris and slag deposits are removed, bricks are inserted and removed, the inside of the furnace is uniformly shaped with castable refractories or plastic refractories, and the entire or partial area is sprayed. Met.

Problems to be Solved by the Invention However, the above-mentioned intermediate repair of a pig iron mixer car costs 3 to 30% per furnace cost.
The work has been carried out four times, and each time the molten metal container furnace of the pig iron truck has to be cooled down, and the workers have to go inside for a long time to make repairs, which makes the working environment not very good. It was also expensive.

Means for Solving the Problems The present invention has been made in view of the above problems, and in order to solve the above problems, a castable refractory is inserted into the pig iron mixer car from the pig iron receiving port of the pig iron mixer car which discharges hot metal and slag. The molten metal container is put into the furnace, the lid is airtightly attached to the pigtail receiving port, and the pig iron mixing car is slowly rotated to line the inner circumferential surface of the molten metal container furnace of the pig iron mixing car with castable refractories. The object of the present invention is to provide a method for repairing a refractory lining of a mixed pig iron car.

Operation When using the method of the present invention, without waiting for the molten metal container furnace of the pig iron mixer car to cool down, after discharging the slag deposits, pouring the castable refractory from the pigtail receiving port, attaching a lid to the pigtail receiving port, By rotating the pig iron mixer car slowly, repair work can be carried out inside the furnace of the pig iron mixer car, and the remaining heat storage of the lining refractory can be used to dry the castable refractory coated inside the furnace, which saves heat energy. It can be used effectively.

Example Hereinafter, the present invention will be explained based on examples.

FIGS. 1 and 2 show an embodiment of the present invention. Mixed iron car 1
As shown in FIGS. 1 and 2, a rugby ball-shaped molten metal container furnace 2 is rotatably mounted on a conveying cart 4 having wheels 3 connected to the front and rear. As shown in the figure, a tilting device 5 with a predetermined reduction gear is disposed on one end side of the transport vehicle 4, so that the molten metal container furnace 2 of the pig iron mixer truck 1 can be tilted freely at a predetermined angle. At the same time, the molten metal container furnace 2 can be rotated slowly at 1 to 10 r, p, -.

The rugby ball-shaped molten metal container furnace 2 is provided with a receiving port 6 in the upper center as shown in the figure, and a refractory lid 7 is attached to the receiving port 6 so that it can be opened and closed. The pigtail receiving port 6 is airtightly covered so that the castable refractories 8 loaded therein do not flow out during repair. The air-tight sealing means for the lid 7 of the pigtail receiving funnel 6 can be achieved by interposing a sealing material such as ceramic fiber, plastic refractory material, glass material, or the like.

When the pig iron mixer car 1 is shuttled back and forth between the blast furnace and the converter a predetermined number of times and intermediate repairs become necessary, the pig iron mixer car 1 is stopped at a predetermined repair location, and the iron mixer car 1 is stopped at a predetermined repair location, and the particles stuck to the inside of the molten metal container furnace 2 are removed. Remove any slag and clean the inside. Then, while the molten metal container furnace 2 is sufficiently hot, a predetermined castable refractory 8 is introduced as shown in FIG. The molten metal container furnace 2 is then slowly rotated, and the internal lining surface is coated with the castable refractory 8. The molten metal container furnace 2 should be rotated as slowly as possible to remove the molten metal around the side periphery and bottom, as the hot water contact part 9 at the lower center of the molten metal container furnace 2 and the slag line part 10 at the side periphery are severely damaged. Contact part 9 and slug line part 10
It is preferable to control the rotor so that it can be covered thickly, and to rotate slightly faster at the ceiling portion 12 at the upper circumference.

In this manner, the molten metal container furnace 2 is rotated for a predetermined period of time, and when the loaded refractory 8 adheres to the inner peripheral surface, the tilting device 5 is appropriately stopped, and the construction is completed after drying.

Therefore, intermediate repairs can be carried out efficiently in a good working environment without having to wait for the pig iron mixer to cool down or requiring workers to enter the molten metal container furnace for a long time as in the past.

In addition, in order to coat the left and right side end surfaces of the molten metal container furnace of the pig iron mixer car with refractories, it is also possible to lift and tilt the left and right sides of the pig iron mixer car using a crane or the like. It is also possible to pressurize an inert gas such as nitrogen and charge it into a molten metal container furnace for construction.

In addition, the castable refractories for the above-mentioned hot coating should preferably have good wave properties, good adhesion, excellent durability, corrosion resistance, and ease of handling, etc. For example, use a cement-based binder. It is preferable to use alumina-silicon carbide refractories.

Effects of the Invention As described above, in the present invention, intermediate repairs of a pig iron mixer car can be carried out without waiting for the pig iron mixer car to cool down, and the refractory lining can be constructed while the inside of the furnace is in a hot state where the temperature is sufficiently high. As a result, it is possible to save labor, save energy, simplify and shorten the process, and also reduce the number of operating pig-mixing cars and reduce repair costs.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted side sectional view of a pig iron mixer car according to an embodiment of the present invention, and FIG. 2 is a side sectional view for explaining the construction of the same. ■... Pig mixer car, 2... Molten metal container furnace, 5... Tilt device, 6... Pig receiving port, 7... Lid body, 8... Castable refractory. Applicant Kawasaki Rozai Co., Ltd. Agent Patent Attorney Kuni Morimoto Figure 2

Claims (1)

[Claims] (1) Inject the castable refractory into the molten metal container furnace of the pig iron mixer car from the pig iron receiving port of the pig iron mixer car that has discharged hot metal and slag, and then slowly move the pig iron mixer car by attaching the cover airtight to the pig iron receiving port. A method for repairing a refractory lining of a pig iron mixer car, characterized by lining the inner peripheral surface of a molten metal container furnace of the pig iron mixer car with a castable refractory.