JPS6246157Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an improvement of a slag drain for an electric furnace. Normally, the slag drainage gutter of an electric furnace is re-maintained and restored after each heat melting process, but during the maintenance and restoration work, the removal of steel slag stuck to the inner surface of the gutter is
Conventionally, methods using input using a crowbar and methods using mechanical force using a charging machine for charging ferroalloy, auxiliary materials, etc. into the furnace have been used. However, recently, in order to save energy and labor, electric furnaces have been introduced that charge ferroalloys and auxiliary materials into the furnace using an automatic cutting and charging device that uses a chute from the top of the furnace or the upper part of the furnace wall, instead of using a conventional charging machine. is increasing. Therefore, conventional charging machines have been either eliminated or not installed from the beginning, and therefore, the only method remaining for maintaining and restoring the slag culvert is an input method. Under these circumstances, conventional slag drainage gutters are constructed by lining a gutter frame 1 with refractory bricks (or refractory castable) 2 and stamping magnesia-based granular refractories 3 on the inside, as shown in Figure 1. In such a conventional slag drain, the slag penetrates between the particles of the refractory material 3 by one time of slag removal, and is fixed like a monolith. This fixed steel slag is extremely difficult to peel off by input, and is also a safety problem. The present invention solves the above-mentioned conventional problems and provides a slag drainage gutter that _can be easily and safely maintained and restored by inputting information.
This slag drainage gutter for an electric furnace is characterized in that a refractory made of organic material and inorganic material is formed into a board shape and is constructed on the innermost side of the gutter. The present invention will be explained in detail below. In the slag drain according to the present invention, when the innermost refractory of the slag drain comes into contact with molten slag during slag discharge in an electric furnace, a thin glass-like molten layer is generated on the surface layer of the refractory. Due to the presence of a glassy, molten layer, molten slag does not penetrate into the refractory, and a sintered layer is formed directly below the molten layer, making it able to withstand multiple slag removal operations. Moreover, the lower part (back layer) of the sintered layer turns into ashes, and the refractory can be easily peeled off manually during maintenance and restoration work. Such a slag gutter can be obtained by making the composition of the innermost refractory to contain 78 to 93% SiO ₂ , with the balance preferably being 2 to 12% organic material and the remaining inorganic material. . As the organic material, an organic binder such as phenol resin and organic fiber such as paper are used as necessary, and as the inorganic material, Al ₂ O ₃ ,
Inorganic powder such as MgO and Fe ₂ O ₃ and, if necessary, inorganic fibers such as asbestos are used. To build the refractory into a gutter frame, the refractory can be formed into a board and attached directly to the gutter frame, or it can be attached to the inside of the gutter frame lined with refractory bricks (or refractory castables). good. Specific mounting examples are shown in FIGS. 2 and 3. In the figure, 1 is a gutter frame, and 2 is a refractory brick. Reference numeral 4 denotes a fireproof board, and in this embodiment, boards with a grooved cross section are laid in two rows. Table 1 shows the names of the fireproof boards in the examples, and Table 2 shows an example of the state of layer change after use.

【table】

[Table] As described above, in the slag drainage gutter of the present invention, a fireproof board having the above composition is attached to the inside of the gutter frame that is attached and fixed in advance to the slag discharge port of the electric furnace, or to the inside of the fireproof bricks that line the gutter frame. Because of this, it is extremely easy to install and remove the fireproof board, and the effort required to maintain and restore the gutter can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a conventional slag drain, and FIGS. 2 and 3 are perspective views showing the structure of a slag drain in an embodiment of the present invention. 1: Gutter frame, 2: Firebrick, 3: Granular refractory,
4: Fireproof board.

Claims (1)

[Scope of utility model registration request] A slag drainage gutter for an electric furnace, characterized in that a refractory material containing 78 to 93% SiO ₂ and the remainder is organic and inorganic is formed into a board shape and constructed on the innermost side of the gutter.