JPH0733956B2 - How to set the nozzle brick to the nozzle tuyere brick - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle for use in a mechanism for discharging molten metal from the bottom of a molten metal container. It relates to a method of setting on a tufted brick. 2. Description of the Related Art Conventionally, a means for setting a nozzle brick on a nozzle tuyere brick by applying refractory mortar to the nozzle brick has been practiced. However, according to the refractory mortar, when the nozzle brick reaches its limit of use, the refractory mortar is welded when the nozzle brick is replaced, and the nozzle brick cannot be removed from the nozzle tuyere brick. Often happened. In particular, this welding is remarkable when the alumina graphite nozzle is used. It is considered that this is because the alumina graphite nozzle has high thermal conductivity because it has graphite, and the heat transfer to the refractory mortar interposed between the nozzle and the tuyere brick becomes large. Therefore, in order to prevent this welding, it has been proposed to use a coating agent obtained by deflocculating graphite powder in a solvent at the portion where the nozzle brick or nozzle tuyere brick is bonded, but this is not effective and the nozzle The use of breakers was inevitable for the removal and installation of bricks, which resulted in the secondary problem that the inner surface of the nozzle tuyere bricks was damaged by the breakers, resulting in a short service life of the nozzle tuyere bricks.
Further, since the nozzle desorption action by the breaker is a work at high temperature, it is not preferable from the viewpoint of working conditions of workers. An object of the present invention is to solve the problems of the conventional method and to provide a method of setting a nozzle brick on a nozzle tuyere brick, which enables the nozzle brick to be easily attached and detached. To achieve this object, the present invention has the following constitution. That is, in the present invention, in FIG. 2 to FIG. 4, the graphite sheet 2 is wrapped around a part or the whole of the outer peripheral surface of the nozzle brick 1, and then the refractory mortar 3 is applied onto the graphite sheet 2 to form the nozzle. It is characterized in that it is inserted into the tuyere brick 4 and set in a predetermined position. In addition, this nozzle brick 1
The graphite sheet 2 and the graphite sheet 2 may be bonded to each other via an organic adhesive, an inorganic adhesive, or the like, or an adhesive may not be used. The present invention has a high fire resistance of a graphite sheet,
A non-reactive material with mortar or refractory is used, and it is desirable to use a highly graphite sheet formed of expanded graphite as much as possible. [Example] When used in actual operation under the following conditions,
The product of the present invention was easy to pull out the nozzle brick and showed good results as shown in Table 1. 1. The upper nozzle of the sliding nozzle in a ladle with a capacity of 250 tons. [0012] [Table 1] [Effect of the invention ] In the present invention, the high fire resistance of the graphite sheet,
It uses non-reactivity with mortar or refractories.
Yes, the graphite sheet has excellent fire resistance, withstands heat and
Nozzle brick that does not react with tar or refractory
There is an effect that it can be easily attached and detached. As shown in Table 1, even when any of the above graphite sheet materials was used, the nozzle could be pulled out in an extremely short time as compared with the conventional case. As a result, the work of removing the nozzle bricks remaining in the nozzle tuyere bricks with a breaker is reduced, the inner surface of the nozzle tuyere bricks is not damaged, and the life of the nozzle tuyere bricks is not shortened. The work environment for workers was also greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a conventional nozzle brick. FIG. 2 is a vertical sectional view of a nozzle brick according to an embodiment of the present invention product. FIG. 3 is a vertical cross-sectional view of a nozzle brick according to an embodiment of the present invention product. FIG. 4 is a vertical cross-sectional view of a nozzle tuyere brick set according to an embodiment of the present invention. [Explanation of symbols] 1 Nozzle brick 2 Graphite sheet 3 Refractory mortar 4 Nozzle tuyere brick [Table 1]

Claims (1)

[Claims] Graphite wrapped around the outer circumference of a nozzle brick
High fire resistance of the sheet and non-reaction with mortar or refractory
It using the refractory nozzle tuyere set how the bricks of the nozzle brick, characterized in that the refractory mortar is interposed set between the graphite sheet and the nozzle tuyere brick.