JPS58117809A - Lining method for tap hole of blast furnace - Google Patents

Abstract

PURPOSE:To improve installation efficiency and to obtain stable and durable lining by charging refractories for molding in the space part formed by installing a backing plate at the preceding end of a housing metal, applying oscillations thereto and deaerating the refractories through the vent holes of the backing plate. CONSTITUTION:One end of a housing metal 3 is connected to the tap hole bricks 8 on the inner side of a furnace, and a backing plate 16 adhered with a sealing material 15 such as cardboard is provided at the other end. Refractories for molding 12 are charged with a belt conveyor 10 into the space and a bar-like vibrator 11 or a vibrator 14 mounted to the plate 16 is operated to pack the refractories. Perforated hollow pipes 21 are inserted into the refractories 12 by means of insertion jigs 22 through the vent holes 13 of the plate 16 to about 200mm. depth to deaerate the refractories. Just before the refractories begin to harden, only the jigs 22 are removed. Thereafter the refractories 12 are dried thoroughly, then a tap hole is opened therein and iron is tapped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method using refractories for cast molding by vibration or underground pouring in the metal lining of a tap iron rig for a blast furnace. The purpose of this project is to improve the environment for tapping iron lining construction work, reduce the amount of work required for high-temperature, heavy-duty work, and improve durability. In the tapholes of modern blast furnaces, bricks are used inside the furnace and monolithic refractories are used on the outside. Stuff-forming refractories are used for the monolithic refractories, and as shown in Figure 1, a method is adopted in which a predetermined amount of stuff-forming refractories is poured into the refractories and then formed into layers while being pounded with Lasimer. It is being

However, stuff molding has the disadvantage that many discontinuous, porous layers with different filling densities are laminated in the mold. Furnace gas blows out through this rounded, discontinuous layer, and because it is porous, there is a limit to its durability. Furthermore, construction work performed by staff members has the problem of having to perform material input and stamping work in a narrow working environment at high temperatures, requiring long hours of hard labor.

The present invention solves the above-mentioned problems.When lining the blast furnace taphole housing hardware with refractory material, a sealing material is provided on the inner surface and a patch plate having deaeration holes is installed in the blast furnace taphole jig. Installed at the tip of the hardware, poured refractory for pour molding or vibration molding refractory is placed in the space between the roaring plate and the taphole brick, and fills it while applying mechanical vibration. This is a blast furnace taphole lining construction method characterized by inserting a porous hollow body into the filled refractory through the degassing hole of the caul plate and degassing the refractory before it hardens.

The refractory for cast molding used in the present invention is a refractory for vibration molding. A refractory for vibration molding has physical properties such that it has a low moisture content and becomes more fluid when subjected to vibration, and becomes more solid when the vibration is stopped. When using refractories for cast molding, the moisture content in the refractories is lower than that of refractories for stamp molding! s ~ 20 degrees, so drying cannot be done within the required running time. Therefore, when using such a material, a predetermined amount of exothermic agent is added to the material to facilitate drying. Furthermore, when using refractories for vibration molding, addition of a heat generating agent is not necessary because the construction can be performed with the same amount of moisture as the stamp material. Furthermore, unlike the refractory for cast molding or the refractory for vibration molding used in the present invention, the refractory is dried with almost no strength. Therefore, if moisture, gas, etc. in the refractory cannot be physically removed during the drying stage, steam and gas are generated and expanded, causing structural destruction such as laminar cracks and deterioration. In order to solve this problem, the present invention uses a porous hollow body as shown in FIG. 3, which is immediately restrained and dried after the completion of molding and prepared in advance at an intermediate stage, and is then dried within the time shown in FIG. 4 using an insertion jig. An example of this will be explained below. Figure 2 is a cross-sectional view showing a part of the blast furnace taphole. Housing metal fittings 3
A part of (6) is connected to the taphole brick 8 inside the furnace.
). Iron round bars, flat bars, reeds, etc. are optionally welded in parallel or in a staggered manner inside the housing hardware 3.

These protrusions 18 improve the fixity of the gas-sealing china clay and the installed refractory.For the monolithic refractory used as the material for the inner lining of the housing metal fittings 3, cast molding or vibration molding is used. Refractories for cast molding or vibration molding are conveyed to the ejection port using a belt conveyor 10 or a press-fit positioner, etc. After that, the refractories for cast molding or vibration molding are conveyed to the ejection port. The attached vibrator 14 is activated and filled.A sealing material 15 made of a material that can be relatively easily punched, such as cardboard, is pasted on the inner surface of the patch plate 16.Approximately 150 sheets of seal material 15 made of a material that can be punched relatively easily, such as cardboard, is pasted on the inner surface of the patch plate 16. - One deaeration hole 13 is provided in a staggered manner at a pitch of approximately 100 cm. After filling, the porous hollow body 21 is provided in a refractory for cast molding 12 through the deaeration hole 13 of the backing plate 16 at a pitch of approximately 200 cm.
■Insert to depth. When inserting, the insertion jig 22 is used as a guide, and only the insertion jig 22 is pulled out just before curing begins.

The porous hollow body 21 preferably has a heat resistance temperature of 100 C or higher, and is suitably made of Barenteufu grade small tin 0 pyrene fiber. Natural fibers such as hemp4 can be used.

The porous hollow body 21 prevents the filler from flowing into the deaeration hole 13 after the insertion jig 22 is pulled out, and prevents the filling from clogging, and at the same time, the fibers maintain the formation of passages for moisture and gas, thereby forming a refractory for casting 12. It speeds up the drying of. After that, the refractories 12 for cast molding are completely dried, and then the refractories 12 for cast molding are completely dried, and then a tap hole is opened and the iron is tapped.

When the above method is used to construct the blast furnace taphole, the construction efficiency is 1/1 compared to the conventional construction method, as shown in Table-2.
In terms of physical properties, the refractories used have properties that are superior to those of conventional stamp molding refractories 3, as shown in Table 1, and the usage results show good fire resistance as shown in Table 3. The physical consumption rate decreased by 15 to 3,091 points. In addition, the work environment for taphole lining has been greatly improved, and stable durability has been achieved.

Table 1: Quality examples of refractories for casting 2: Comparison of construction times between the inventive method and the conventional method 3: Comparison of results using the inventive method and the conventional method

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the conventional method, Fig. 2 is a schematic diagram of the construction method according to the present invention, Fig. 3 is a diagram showing the odor control method for deaeration used in the present invention, and Fig. 4 is a diagram showing optimal deaeration work. It is a figure showing an example of area. 1... Blast furnace lining refractory 2... Blast furnace shell 3...
Housing sig 4Hff 4-・Rashimer 5... Refractory for stash forming 6... Formwork 7... Interlayer
8...Taphole brick 9...Taphole 1
0... Belt conveyor 11... Rod-shaped vibrator
12-・Refractories for cast molding 13... Deaeration hole
14... Vibrator 15... Seal material 1
6... Back plate 17... Cushion i 1B... Convex object 19... Stopper 20-- Handle 21...
Porous hollow body 22... Insertion jig Fig. 1 Fig. 3 Fig. 4 □ Bendouenghole fork tie ξnge (order)! Completed

Claims (1)

[Claims] When lining the blast furnace taphole housing metal fittings with refractory material, a sealing material is placed on the inner surface and a patch plate with degassing holes is installed at the tip of the metal fittings of the blast furnace taphole housing. A refractory for cast molding is introduced into the space between the refractories and the refractory is filled while applying mechanical vibration.During the process, before the refractory is hardened, a porous hollow body is inserted into the refractory through the degassing hole of the caul plate. A blast furnace taphole lining AM method characterized by inserting and degassing.