JPH0697137B2 - Smelting furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a smelting furnace.

[Conventional technology]

Generally, in a smelting furnace in a continuous copper manufacturing process,
Since gas, powder, etc. are being blown in at high speed through the lance, waves are rising on the surface of the molten metal. Moreover, the stored molten metal is at a high temperature. For this reason, the bus line position on the side wall of the furnace body is most eroded. Therefore, in a conventional smelting furnace, a block jacket for cooling is buried over the entire side wall at the position of the bus line to suppress melting damage on the inner surface of the side wall.

Conventionally, as this type of smelting furnace, one shown by reference numeral 1 in FIG. 3 is known. The smelting furnace 1 is provided with a bottom wall brick 11 at the bottom of the furnace, and a lower peripheral wall brick 12 is erected on the periphery of the bottom wall brick 11 so as to rise upward. The upper surface of this lower peripheral wall brick 12 has a bus line brick on its inner peripheral side.
13 are placed. This bus line brick 13 is made of electroformed brick, and is formed thicker in consideration of melting loss,
The thickness of the furnace body in the radial direction is 190 mm.
Further, on the outer peripheral side of the bus line brick 13, a bus line block jacket 14 is provided for cooling the bus line brick 13 and suppressing melting loss. The bus line block jacket 14 is made of a copper cake jacket, is formed at the same height as the bus line brick 13, and its inner peripheral surface is in contact with the outer peripheral surface of the bus line brick 13. It is arranged. On the upper surfaces of the bus line block jacket 14 and the bus line brick 13, a retainer block jacket 15 is placed. The retainer block jacket 15 is also made of a copper cake jacket, and the lower surface of the retainer block jacket 15 contacting the bus line brick 13 is formed so as to be inclined downward toward the inner peripheral side. By inclining in this manner, a gap due to a difference in thermal expansion is prevented from being formed between the bus line brick 13 and the bus line block jacket 14 which are in contact with the lower surface.

[Problems to be solved by this invention]

However, in the smelting furnace 1 described above, when used for a long period of time, the bus line brick 13 is largely melted, and the lower peripheral wall brick 12 thereunder is cracked, causing peeling and falling off. I got it. Furthermore, if the molten metal leaks out of the furnace due to such melting damage and peeling-off, the furnace must be stopped and cooled to carry out furnace repair, which requires a great deal of cost and manpower. However, there was a problem that it would suffer a huge loss.

By the way, as a result of using the above-mentioned smelting furnace 1 for 2 years, the bus line brick 13 was melted and damaged as shown by an arrow A in FIG. In addition, the lower peripheral wall bricks 12 stacked below it
Also peeled off as shown by arrows B and C in the figure.

[Object of the Invention]

This invention, even when used for a long period of time, has a low melting loss of the bus line brick and is peeled off to the lower peripheral wall brick provided below the brick.
It is an object of the present invention to provide a smelting furnace that does not fall off and has no possibility of molten metal leakage.

[Excessiveness leading to the invention]

In order to solve the above problems, the conventional smelting furnace 1
As a result of the analysis, the cause was found to be as follows.

That is, in the smelting furnace 1, the bus line brick 13 is
In consideration of the melting loss, the thickness of the furnace body in the radial direction is set to be thick. Therefore, the inner side surface of the furnace that comes into contact with the molten metal is not sufficiently cooled, and as a result, the inner side of the furnace is largely melted and damaged during long-term use. Also, due to the melting damage of the bus line brick 13,
Since the downward pressing force by 13 is reduced, the lower peripheral brick
In Fig. 12, the downward pressure by the bus line block jacket 14 and the upward reaction force from the bottom wall brick 11 are shown on the outer peripheral side and the inner peripheral side as indicated by arrows P and Q in Fig. 4, respectively. Shift to join. Therefore, cracks occur in the lower peripheral wall brick 11,
The peeling-off occurs from that part.

Therefore, it has been found that when the thickness of the bus line brick in the radial direction of the furnace main body is reduced in consideration of sufficiently cooling the wall surface inside the furnace, melting loss is reduced. On the other hand, it has been found that if this thickness is too thin, cracks occur due to the pressing force applied to the bus line brick in the vertical direction.

Because of this, it is possible to prevent the bath line bricks from melting and
In addition, it was found that it is necessary to set the thickness of the bus line brick in the radial direction of the furnace body within a certain range in order to prevent the lower peripheral wall brick from peeling off.

[Structure of Invention]

The present invention was made based on the above findings, and the thickness of the bus line brick in the radial direction of the furnace body is 0.3H, where H is the dimension of the bus line brick in the height direction.
The configuration is set to ~ 150mm.

[Action]

According to the smelting furnace of the present invention, the upper limit of the thickness of the bus line brick (thickness in the radial direction) is set to 150 mm or less, so that peeling or cracking of the lower peripheral wall brick arranged at the lower portion of the bus line brick Can be dramatically reduced. this is,
Based on the following circumstances. That is, in this type of smelting furnace, when the thickness of the bus line brick is thicker than 90 mm, even if the cooling capacity of the bus line block jacket or the press block block jacket is changed, the temperature inside the bus line brick is not It is known to make little change. Further, the temperature of the copper solution contained in the smelting furnace is also constant around 1200 ° C to 1260 ° C. Further, the material of the bus line brick used is an electroformed brick, and the properties such as heat insulation performance and strength are almost constant. For this reason, under normal operating conditions, the bath line brick is melted by the molten metal until the remaining thickness is around 90 mm, and when the remaining thickness is around 90 mm, the bath line brick is almost melted by the cooling effect. It stops and becomes stable. Here, assuming that the initial thickness of the bus line brick is 150 mm, the exposure amount of the upper surface of the lower peripheral wall brick at the bottom of the bus line brick is about 60 mm in the radial direction when the melting loss is almost stopped. Becomes When the exposed amount exceeds this dimension, it is found that the phenomenon that the lower peripheral wall brick is cracked or peeled off due to the forces in the P and Q directions shown in FIG. ing. It is also known that this phenomenon has little correlation with the surrounding cooling conditions. Therefore, according to the present invention, by setting the thickness of the bus line brick to the upper limit value or less, the exposed amount of the lower peripheral wall brick is 60 mm.
The effects as described above can be achieved by pressing the following.

On the other hand, in the smelting furnace of the present invention, the lower limit of the thickness of the bus line bricks is set to 0.3H, so that the upper and lower bricks and jackets are expanded by compressive stress when the temperature is raised, and the heat during operation is increased. Even if stress is applied to the bus line brick, it is unlikely to be cracked, and problems such as breakage can be reduced. Here, 0.3H is usually a minimum value of 75 mm, as will be described later in Examples. With this numerical value, problems such as breakage of bus line bricks can be greatly reduced regardless of cooling conditions and the like.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In these figures, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is a diagram showing a smelting furnace 2 according to the present invention. In this smelting furnace 2, the bus line brick 21 is made of electroformed brick and has a thickness of 13 in the radial direction of the furnace body.
The height is 0mm and the height is 300mm. The bus line brick jacket 14 provided on the outer peripheral side of the bus line brick 21 is also formed at the same height as the bus line brick 21. The bus line L is set at a position 70 to 80% of the height of the bus line brick 21 from the lower end of the bus line brick 21.

As described above, in this smelting furnace 2, since the thickness of the bus line brick 21 in the radial direction of the furnace body is 130 mm, the thickness is too thick and the wall surface inside the furnace of the bus line brick is Not only is it not sufficiently cooled, but it is not too thin, and cracks do not occur due to the thickness of bricks added in the vertical direction, and the wall inside the furnace is sufficiently cooled. Therefore, it is possible to limit the melting loss of the bus line brick to a small range.

In addition, in the above smelting furnace 2, the bus line L is 70 to the height of the bus line brick 21 from the lower end of the bus line brick 21.
Since it is set to the position of 80%, it is possible to position the bus line position with the most severe erosion damage within the range of the cooling by the press block jacket 15 and thus the erosion damage of the bus line brick 21. It can be kept in a small range. Further, since the position of the bus line L, which is most eroded, is set to a position far from the bottom surface of the bus line brick 21, melting damage may extend to a portion of the bus line brick 21 in contact with the lower peripheral wall brick 12. Therefore, it is possible to prevent the lower peripheral wall brick 12 from cracking and peeling off from the lower peripheral wall brick 12. Further, since the position of the bus line L that is most eroded is set to a position slightly lower than the upper end of the bus line brick 21, the erosion does not reach the hold-down block jacket 15, and the hold-down block jacket 15 is used. Can be prevented from being damaged.

By the way, as a result of using the smelting furnace 2 for two years, the bus line brick 21 is melted only in a small area as shown by an arrow D in FIG. 2, and the lower peripheral wall brick 12 provided below it is melted. No cracking occurred, and neither peeling nor falling off occurred.

In the above embodiment, the thickness of the bus line brick 21 in the radial direction of the furnace body is 130 mm, but the thickness is not limited to this, and when the height of the bus line brick is H, 0.3 H to 50 mm. It should be set in the range of. Further, for the lower limit value 0.3H of the thickness of the bus line brick 21, since the height of the bus line brick 21 is usually 250mm ~ 350mm,
The lower limit of thickness 0.3H is a value between 75mm and 105mm.

〔The invention's effect〕

As described above, in the present invention, the thickness of the bus line brick in the radial direction of the furnace body is 0.3H to 150 mm, where H is the dimension in the height direction of the bus line brick.
As a result, the melting loss of the bus line brick can be suppressed to a small range, and the effect of preventing damage to the bricks around it can be obtained. The cost and labor can be saved, and a huge loss due to molten metal leakage can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a state after the smelting furnace shown in FIG. 1 has been used for two years, and FIG. 4 is a sectional view showing an example of the smelting furnace of FIG. 4, and FIG. 4 is a sectional view showing a state after the smelting furnace shown in FIG. 3 has been used for 2 years. 14 …… Bath line block jacket, L …… Bath line, 2 …… Smelting furnace, 21 …… Bath line brick.

Claims (1)

[Claims] 1. A bus line brick which is formed of electroformed brick and whose inner side surface is exposed to the inside of the furnace at the position of the bus line in the side wall of the furnace main body from the inner peripheral side to the outer peripheral side, and this bus line. A bus line block jacket in contact with the outer surface of the brick is provided annularly over the entire circumference of the side wall of the furnace body, and the positions of the upper and lower ends of the bus line brick and the bus line block jacket are substantially the same. The lower surface of the bus line brick and the lower surface of the bus line block jacket is supported by an annular lower peripheral wall brick disposed below them, and the position of the inner peripheral surface of the lower peripheral wall brick and the inside of the bus line brick are set. A smelting furnace in which the circumferential positions are set to be substantially the same, and an annular presser block jacket for cooling the bus line brick from above is placed on the upper surface of the bus line brick. Fraud and mitigating risk thickness of the bus line bricks in the radial direction of the furnace body, the height dimension of the bus line brick When H, smelting furnace, characterized in that set to 0.3H～150mm.