JPS5912725B2 - Container for molten metal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal blowing ladle using oxygen, inert gas, etc., various reaction vessels, or a molten metal refining furnace such as a steelmaking furnace or a hot metal furnace.

Generally, when refining molten metal such as steel, the general fluid injection method, LD-VAC method, VAD method is used to improve the quality of the steel, remove non-metallic inclusions, equalize the molten metal temperature, etc. Gas is injected into the molten steel in the furnace from the bottom of the pan in the DH method and from a part of the DH (RH) reaction vessel in the RH method.

Also, quality improvement 1. Improved productivity, economical process, simplified operation, reduced costs, extended furnace lining,
In order to achieve various other purposes, for example, AOD furnaces have been adopted in steelmaking furnaces, etc., and in both cases, gases such as 0□, Ar sN2, air, etc.
Alternatively, hydrocarbon gas or liquid is injected into the molten metal in the furnace, either alone or in combination with powder or granules.

However, under this form of work,
Ladles, steelmaking furnaces, and other molten iron smelting furnaces all had many drawbacks.

For example, one specific example is ■Ladle.In this case, gas is blown from the bottom of the pan, and most of the time, a porous plug that is fixed to the bottom of the pan or a plug that has a thin through hole is used. The disadvantage in this case is 1. The plug deteriorates and peels off due to contact with the slag.

Also, if metal is attached, it will be further peeled off when it is removed.

2. Removing the plug and installing a new one takes a long time and is labor-intensive work.

3. Since it is necessary to continue blowing gas from the start of steel receiving until the slag is discharged, the hose must be connected to the container during that time, making the work complicated.

4. This is the same process as setting the injection nozzle, that is, it requires skill.

5. Because this work requires skill, if the setting is incorrect, molten steel may spill out from between the plug and the tuyere brick.

■ Steelmaking Furnace On the other hand, fluid from the bottom of the steelmaking furnace is supplied through a refractory blowing part (tuyere or nozzle) fixed to the bottom of the vessel.

This blowing part may be a plug having a thin through hole, a plug that is a combination of a plug having this fine hole and a porous plug, or each may be used alone or in combination.

The drawback in this case is that the walls around the 1' plug portion (side walls and bottom wall) are severely damaged by the stirring molten steel, and the plug itself is particularly damaged.

2' It takes a long time to replace the plug, and it is difficult due to the intense heat and intense movement.

3' This plug replacement is limited to when the furnace is stopped.

This invention aims to eliminate these drawbacks, and the gist of this invention is to supply fluid, gas, or solids to required locations on the side of a pot or furnace in a form that allows the main parts to be replaced. To describe this more specifically, in the housing container 1, a blowing hole 2 for inert gas or the like is penetrated into the lower part of the peripheral wall thereof, and a fixing plate brick 3 is installed in the same part. The communication hole 4 on this plate brick 3 and the above-mentioned blowing hole 2 are brought into contact and fixed, and then the sliding plate 5 is installed in a slidable state on the upper surface of the plate brick. A required porous plug or a plug with small holes 7 can be detachably attached to a small hole 6 formed on the sliding plate 5 or further superposed thereon so that its sliding trajectory matches the communication hole 4. It is a container for molten metal which is fitted under certain conditions and has the tip of a supply pipe 8 for gas or fluid connected to the plug 7.

In addition, numeral 9 in the figure indicates a pressing plate with a spring element for generating a required surface pressure at the surface contact portion between the plate brick 3 and the sliding plate 5.

Further, the plate bricks 3 may be integrated into the housing container 1 in a buried manner.

Also, what is a normal plug? ■ A brick with air permeability such as a gas-permeable porous material formed into a truncated cone shape in the center or eccentric part of a normal refractory brick (sliding plate) is attached and detached at will. (referred to as a porous plug) ■ When the entire refractory brick is porous, that is, a molded body made of gas-permeable porous material (referred to as a porous plug) θ For blowing the required number of gases in the above ■ and ■ A plug with pores (referred to as a porous plug) ＠ A plug made of refractory material in the form of ■ and ■ above, and with the required number of pores for gas injection perforated in the same way as in 6. (referred to as a plug with pores) etc.

Furthermore, the movement of the sliding plate can be either reciprocating or rotary (see Figure 3).

Further, the blowing can be carried out freely in the direction of the center and in the tangential direction of the upper and lower blades (see Fig. 6).

It is also possible to intervene with a damage preventive agent 1o on the sliding surface of each brick, or to inject a solid substance into the sliding surface (see FIG. 4).

Further, protrusions 11 may be provided to hold the lining.

Also, a plurality of gas distribution passages 2' may be provided (eighth
, see Figure 9).

In addition, the plug should be installed at a position higher than the slag retention height.

Further, it is preferable that the lower surface of the inlet port be angled downward toward the inside of the furnace.

In addition, the volumes of the large opening and the large opening and the medium hole must be large enough to prevent molten steel from solidifying (when in contact with molten steel without bubbling).

Furthermore, by providing a laterally wide hole and sliding it perpendicularly to the major axis, the sliding stroke can be minimized and the fluid blowing ability and fluid contact effect can be maximized (see Fig. 10).

First Embodiment Referring to FIG. 1, first, the plug of the plug plate is closed by a fixing plate, and then molten steel is poured into the pan.

After receiving the steel, if fluid is continued to be supplied to the plug and the plug portion of the plug plate is aligned with the hole in the fixed plate connected to the large blowing port, the fluid will be blown into the furnace through the large blowing port.

When there is no need to inject fluid, the plug plate is slid to the closed position as shown in the figure while supplying fluid, thereby making it possible to inject fluid when necessary.

If the injection is to be continued until the discharge of the molten steel is completed, the fluid should be continued to be blown until the molten steel passes through the plug.

If there is metal attached to the large injection port, open the plug plate and wash the core with oxygen, then set the supply mechanism to set 1 or blow oxygen from the plug as shown in Figure 3 to remove oxygen. Washing has the advantage that the work can be completed without opening the plug plate, that is, with the supply mechanism still set.

Second Embodiment In FIG. 1, the pan is prepared with the plug aligned with the hole in the fixed plate connected to the large blowing port.
After that, continue to blow fluid through the plug.

Next, molten steel is poured into the pan, and the rest is the same as in the first embodiment.

Third Embodiment When the three plates shown in FIG. 2 are used, the force ζ that keeps the inner hole of the sliding plate closed by the fixed plate may be supplied with fluid to the plug.

Next, pour the molten steel, continue to supply fluid to the plug after receiving the steel,
By sliding the stationary plate, the center hole is aligned with the population of the large mouth of the fixed plate.

As a result, fluid is blown into the molten steel, but even if the molten steel is gone, the fluid continues to be blown, and the inner hole of the sliding plate is slid to the closed position.

The above is the basic procedure for blowing fluid, and it is carried out according to this.

If necessary, the plug 7 may be oriented downward as shown in FIG. 3, and if the amount of blowing is to be increased, the plug may be switched to the upper three-hole plug.

Regarding the replacement of the supply mechanism, see A. In the case of the one shown in Figure 1, release the surface pressure loading device, remove the plug plate pressing plate 9, and install a new plug plate (if the fixing plate is also damaged, replace it with a new fixing plate. 3), set the surface pressure loading device and complete.

If the plug is damaged and the plate is not, replace only the plug.

In addition, by using a cassette type or quick set type device to set the surface pressure loading device, d fixing plate, and plug plate, the work can be done more quickly.

B.

In addition, in the case shown in Fig. 2, the explanation in Fig. 2 is basically the same as in Fig. 1, except that the surface pressure between the sliding plate and the fixed plate is maintained, and the small holes are 1
Keep it in a closed state, release the surface pressure on only the plug plate, release it to the outside of the plug plate (to the opposite side of the furnace), and replace the plug plate, or replace only the plug if only the plug is damaged. do.

After that, move the plug plate to the sliding plate side,
All you have to do is apply a surface pressure between the plug plate and the sliding plate and set up the device.

C0 Furthermore, in Fig. 5, the replacement procedure is basic, but in the case of Fig. 5, only the plug, such as a porous plug or a pore plug, can be replaced quickly. A plurality of plugs are mounted on a plug plate so that the rear parts of the plugs can be opened and closed, and resting plugs that are not being blown are replaced and set.

As described above, the present invention has the following effects.

(a) Even during operation, that is, when the molten metal is in the container, the porous plug can be replaced easily, quickly, and accurately by moving the sliding plate.

(→ Also, at the end of pouring work, it is possible to prevent the slag from coming into contact with the porous plug, effectively preventing the plug from melting.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing a container for molten metal according to the present invention, Figs. 2 to 6 are explanatory views of main parts, Fig. 7 is a plan view showing an example of the blowing direction, and Figs. FIG. 10 is an explanatory diagram showing an example of each inlet. In the figure, 1...container, 2...blow hole, total...
Fixed plate brick, 4... Connector I, 5... Sliding plate, 6... Small hole, 7... Porous plug or plug with small hole, 8... Supply pipe, 9... - Suppression plate 10...damage prevention agent.

Claims (1)

[Scope of Claims] 1) A fixed plate brick that is fixed to the peripheral wall around the injection hole and has a communication hole aligned with the injection hole; 2) A sliding plate that is slidably attached to the fixed plate brick; 2) A sliding plate that is detachably attached to the sliding plate, and by sliding the sliding plate, it aligns with the communication hole and contacts the molten metal; A container for molten metal consisting of a porous plug or a pore plug that moves between positions without contacting the metal.