JPS63165063A - Method for installation of vessel for molten metal - Google Patents

Abstract

PURPOSE:To prevent damage on the rear lining of a vessel and to reduce the cost of refractories by reducing the thickness of the 1st step side wall lining brick to the thickness smaller than in the 2nd step and setting the height thereof at the height equal to the height of a floor lining brick or below. CONSTITUTION:The thickness of the 1st step A of the side wall lining brick 5 is reduced to the thickness smaller than the thickness of the 2nd step brick B and the height size thereof is set equal to or smaller than the height of the floor lining brick 6. The spacing between the bricks and the brick 6 is packed with the castable refractories 7 to form the inside part of the vessel for a mol ten metal, then the projection at the 2nd step B of the side wall lining brick presses the refractories 7 and to prevent the dislodgment thereof. Since a step is formed between the 2nd step B and the 1st step A, the infiltration of the metal is prevented. The damage on the rear lining of the vessel for the molten metal is thereby prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a method of constructing a molten metal container.

(Prior art) Conventionally, as a construction method for molten metal, especially in the case of refining vessels, the space between the side wall lining bricks and the lining bricks is filled with monolithic refractories for the purpose of intermediate repair of the paving bricks. A method is being taken.

This method is as shown in the vertical cross-sectional view of Fig. 1: ■Side wall permanently clad brick/-■Back permanently clad brick 2-■Side wall lining brick 3t■Lay lining brick +=■Side wall lining brick!
(■ is the 1st stage, ■ is the 2nd stage) ・■ Inner lining brick 6-〇 Monolithic refractory (stamp material is castable) 7,
Construction will be carried out in this numerical order. In addition, when filling the space between the side wall lining brick S and the lining brick 6 with monolithic refractory material 7, this interval O should be approximately 100-/20 m in consideration of workability, filling strength, etc. Figure 2 shows the situation when the lining was eroded during the middle chain (when the lining bricks 6 were replaced), and the broken line shows the condition of the lining before use. The shaded area in Figure 2 is dismantled, a new lining brick 6 is applied again, and a part of the corner is filled with monolithic refractory material 7, resulting in the result as shown in Figure 3. Conventionally, this method was used to construct paving bricks and perform intermediate repairs.

(Problems to be Solved by the Invention) However, this conventional construction method currently has the following problems.

B) The irregularly shaped filling part falls off during use.

This is because monolithic refractories are unfired, have low strength, and structurally, no measures are taken to prevent the monolithic parts from falling off, allowing them to escape upwards and causing the phenomenon of falling off. It is something that occurs.

(b) Metal tends to enter between the irregularly shaped filling part and the brick.

This is also similar to B), since the monolithic refractory is unfired.
During use, sintering causes p-shrinkage, which creates a gap between the brick and the monolithic refractory, making it easy for bare metal to penetrate into the lining.

e→ If only the lining is repaired as a whole, it is uneconomical because even if the damage to the seventh tier of side wall lining bricks is small, it must be replaced.

The corrosion damage pattern during overall repair is shown in Figure 1I, but even if the damage to the side wall lining (1st stage 2) is small, it must be replaced.

The following measures have been taken to address the above problems.

1) As shown in Figure S, side wall lining) Brick S/row ■
Use thickness ft 2nd stage ■) Thicken the side wall lining brick 5
A means for preventing intrusion of ingot into the lining by increasing the contact area by making the intrusion path uneven as indicated by the arrow t when intrusion occurs between the metal and the monolithic refractory 70.

In this case, if the metal intrudes from (a) in Figure S, the structure is such that it will collide with the protrusion of the first stage 0 of the side wall lining brick brick So, but above the first stage of the side wall lining brick brick So. If the monolithic refractory 7 falls off, the uneven structure will be lost, so 1.
The result would be the same as the current situation in Figure 1, and the effect would be lost. In addition, there is no structure to prevent the irregularly shaped filling portion from falling off, and the brick shape of the first tier becomes large, which is uneconomical.

As a result of the above, Measure 1 in Figure 5 was ineffective.

11) As shown in Figure 6 σ) and C), the thickness of the first row of side wall lining bricks 5 is made thinner and the penetration route is changed to prevent metal from entering the lining. means to do.

In this case, the irregularly shaped filling part is held down by the protruding part of the second tier of side wall lining bricks (■), which helps prevent it from falling off, and the seventh tier, which is less likely to be damaged, has a thinner thickness, making it more economical. 0 Also, in Figure 6 (a), even if the bullion enters from <b>, it will collide with the route), so the effect of preventing metal intrusion is excellent. It also has the effect of preventing it from falling off because it is held down.

However, Figure 6 (←) shows the state of erosion during the slander, and Figure 6 (c) shows the situation after the slander. It can be seen that the effect is gone.

As described above, the effect of preventing intrusion of metal and preventing falling off by making the thickness of the side wall lining brick/Race (2) thinner than that of the second row (2) was only effective to the point of denigration.

As above! ;! Countermeasures 1)-U) in Figure 6 do not solve the current problems &)-C'')-r.

(Means for Solving the Problems) This invention has been made to solve the above-mentioned problems, and includes preventing the irregularly shaped filling part from falling off and preventing metal intrusion between the side wall part and the irregularly shaped filling part. An object of the present invention is to provide a method of constructing a molten metal container that can prevent and eliminate uneconomical costs during repair.

This invention provides a molten metal container in which the space between the lining bricks and the side wall lining bricks is filled with a monolithic refractory, in which the first stage brick of the side wall lining bricks has a thickness that is equal to that of the side wall lining bricks. It is characterized by being thinner than the second tier bricks and having a height equal to or less than that of the lining bricks.

Next, this invention will be explained with reference to the drawings.

The construction method according to this invention is shown in Fig. 7 ←). It is lower than Shirenga 6. This finning allows the protrusion of the second stage ■ to hold down the 7t unshaped refractory to prevent it from falling off, and the second stage ■
Since there is a difference in level between the 7th and 7th stages, the path for bullion intrusion is uneven, which helps prevent metal intrusion.

In addition, the construction status at the middle price and after the damage is shown in Figure 7 (middle) - (c)
It can be seen that the above-mentioned effect continues to be exerted even after the slander. Furthermore, the brick shape of the third stage (■) is smaller, which is economically advantageous.6. & Due to the above,
This invention addresses the current problems (falling off, metal intrusion - uneconomical)
(Example) The results of using the refining ladle constructed according to the present invention will be explained.

Figure (A) shows the construction status of the 60T LF pot. In this case, the thickness of the small bricks 6 used in the premises is −IQOO
yni's zircon brick - Height p of the 7th step of side wall lining brick j ■ Height p Usage thickness /! ;01nl = 2nd stage ■ Height 230m = Thickness used 0tg unfired high Alt
'O, Part of the textured brick corner is lined with zirconium stamp material. Also, figure JR ←)
This is the condition after using 3j c A at the middle price, the side wall has a remaining size of /30tn, and the bed has a remaining size of about 100111. During use, no falling off of the monolithic refractories and no intrusion of metal into the space between the side wall and the monolithic filling were observed.

Figure R (c) shows the situation after the defacement, and the protrusion at the bottom of the S2nd stage ■ remains only a little, and the entire part of Figure R (←) was effective in preventing falling off and metal intrusion. Also, as shown in Figure ←), the first row of bricks lining the side walls was almost undamaged, making it possible for them to be reused. This is a much greater benefit than the originally anticipated cost benefit of downsizing the first tier of side wall lining bricks. (Effect of the invention) The construction method of the molten metal container of this invention is as follows:
This structure reduces the possibility of the irregular shaped filling part falling off during use, allowing stable and safe use of the padding part.

(, 2) The boundary between the side wall lining brick part and the irregularly shaped filling part has a collision structure that changes the direction of intrusion), and the contact area is large, so the bare metal can easily enter.
Damage to the lining is reduced and safe work can be ensured.

(3) Because the thickness of the side wall lining p/step bricks used is thin, the initial cost of refractories can be reduced, and in some cases, reuse is also possible, making a significant contribution to reducing the unit cost of the refractories. The effect was 6D, which solved all the problems of the conventional method mentioned above.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the conventional construction method, Figure 2 is a vertical cross-sectional view showing the situation at the time of erosion during the above-mentioned damage, and Figure 3 is a vertical cross-sectional view showing the situation after the damage has been completed. The figure is a vertical cross-sectional view showing the erosion pattern during the entire repair of the same as the above, Figure 5 is a vertical cross-sectional view of the construction example on the upper side of the same, and Figure 6 (a) is a vertical cross-sectional view of another construction example of the same as the above. ←) is a vertical cross-sectional view showing the state of erosion at the middle price of the same as above, Figure (c) is a vertical cross-sectional view showing the state of the same after damage, and Figure 7) is a vertical cross-sectional view of the construction method of this invention. Figure, same figure (
B) is a vertical cross-sectional view of the same as the above at the middle price, the same figure (C) is a vertical cross-sectional view of the same as the above after deterioration, and Fig. Figure (C) is a vertical cross-sectional view of the same at the middle price, Figure (C) is a vertical cross-sectional view of the same after the same has been denigrated. /・Side wall permanently stretched brick, 20. Permanent lining brick,
3.1gIj wall lining brick 1≠,・lining lining brick,
jl, side wall lining brick, 60. Shikiuchi Shirenga 176
．． Monolithic refractory 1■0.7th stage・■・・2nd stage 1■・・
Interval 1

Claims (1)

[Claims] In a molten metal container in which the space between the lining bricks and the side wall lining bricks is filled with an unshaped refractory, the first tier of the side wall lining bricks is thinner than the second tier of the side wall lining bricks, and the height is A method of constructing a molten metal container characterized by being equal to or lower than a brick lining.