JP2008215736A - Repair method of copper furnace tuyere brick - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repair method of a tuyere brick capable of performing repair without re-piling up bricks when a residual thickness of the tuyere brick of the copper furnace reaches a prescribed thickness, and reducing the number of times of re-piling work. <P>SOLUTION: A metallic pipe 9 is inserted from a tuyere 6 of the copper furnace, the furnace is rotated so that the tuyere 6 is positioned at a lower part of the furnace, and then a fireproof kneaded material 10 having a weight ratio of mortar:refractory powder of 1:1 to 3:1 is charged through the metallic pipe 9, thus the fireproof kneaded material 10 is filled in a damaged part of the brick 2, and sintered and solidified. An air supply opening 12 may be formed to supply the cooling air into the metallic pipe 9 for preventing temperature rise and seizing of the metallic pipe 9 before charging the fireproof kneaded material 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tuyere brick repair method when the tuyere brick of a copper refining furnace is damaged in a copper refining process of copper smelting.

  In the operation of copper smelting, smelting progresses to the copper refining furnace through the steps of auto-smelting furnace, smelting furnace and converter, and then the molten copper is poured into the mold and the anode used for electrolytic refining is cast. In the copper smelting operation, the copper refining furnace is the final step in raising the copper quality by dry smelting.

  As shown in FIG. 1, a copper refining furnace has a brick 2 lining inside a furnace body 1 called a shell, has a burner hole 3 at one end of the furnace, and has a smoke exhaust hole 4 at the other end. It has a cylindrical shape. A furnace port 5 for receiving the molten copper from the converter is provided at the center of the furnace, and the tuyere 5 is provided at two locations near the burner hole 3 and the smoke exhaust hole 4. Further, one tap hole 7 for discharging the refined molten copper is provided on the opposite side of the one tuyere 5.

  In the process of the copper refining furnace, a certain amount of molten copper produced in the converter is received from the furnace port 5 while being heated and kept warm from the burner hole 3 at one end of the furnace. Next, a pipe is inserted into the tuyere 6, the copper refining furnace is rotated so that the tuyere 6 and the pipe are immersed in the molten copper, air is blown into the molten copper from the pipe to oxidize, or propane is blown in to reduce To do. Thereafter, the molten copper is discharged from the tap hole 7 while the molten copper is kept warm again by the burner, and the copper anode is cast.

  In this series of steps, the brick 2 around the tuyere 6 is particularly severely damaged because of a large temperature change and physical impact during reduction as compared with bricks at other sites. Therefore, normally, the remaining size of the brick 2 is shortened for each refining process, and a damaged portion 2a is generated in the brick 2 around the tuyere 6 as shown in FIG. When the remaining size (remaining thickness) of the brick 2 in the damaged part 2a is about 30 to 40 cm, the molten copper in the furnace is emptied, the heat-burning burner is turned off, and the tuyere is stopped. 6 Neighboring bricks 2 need to be transshipped.

  When repairing the brick 2 around the tuyere 6 (referred to as tuyere brick), it is necessary to stop the refining furnace to be repaired and temporarily lower the operating rate of the previous process such as the converter. Moreover, since the burner is stopped for a long time in order to cool the furnace body, a problem of a drop in the molten copper temperature is likely to occur at the time of starting the operation after brick replacement. Especially if the operation is continued for a long period of time, bricks other than tuyere bricks are gradually damaged and the remaining size becomes shorter, so the difference between the remaining size of the transposed tuyere bricks and the surrounding bricks becomes larger, and the tuyere Since bricks are easily damaged, the frequency of brick replacement is increased. Thus, repair of tuyere bricks is a cause of production loss and cost increase.

  Therefore, in order to reduce the cost of copper smelting operations, it has been studied to extend the life by suppressing damage to tuyere bricks. For example, Japanese Patent Application Laid-Open No. 60-50131 discloses a temperature change and physical impact exerted on a tuyere brick by elongating the tuyere pipe and causing a smelting reaction not in the vicinity of the tuyere brick but in molten copper. A method of suppression is described. Japanese Patent Application Laid-Open No. 07-18347 discloses a method of reducing the number of times of transshipment by cooling down tuyere bricks with a cooling pipe to suppress the damage rate and extending the life of tuyere bricks.

  However, in any of the above methods, even if the damage of the tuyere bricks can be suppressed and the life can be slightly extended, the transshipment work of the tuyere bricks when the remaining size reaches a predetermined thickness is necessary. The number of times could not be reduced significantly. For this reason, it has been difficult to reduce the operation rate of the previous process such as a converter or the frequency of long-time burner stoppage by transshipment of tuyere bricks.

Japanese Patent Laid-Open No. 60-50131 Japanese Patent Laid-Open No. 07-18347

  In view of such a conventional situation, the present invention can be repaired without reloading the tuyere brick as a repair method when the remaining size of the tuyere brick reaches a predetermined thickness. It aims at providing the repair method of a tuyere brick which can reduce frequency | count.

  In order to achieve the above object, the repair method for a copper refining furnace tuyere brick provided by the present invention is a method for repairing a tuyere brick of a copper refining furnace, without reloading the tuyere brick and making a metal from outside the furnace. After inserting the pipe into the tuyere and rotating the furnace so that the tuyere is below the furnace, refractory kneading with a mortar: refractory powder weight ratio of 1: 1 to 3: 1 through the metal pipe The material is poured, and the fired kneaded material is filled in the damaged part of the tuyere brick.

  The metal pipe used for the repair method of the copper refining furnace tuyere brick of the said invention can attach the air supply port which supplies cooling air in a metal pipe to the rear-end side part. In addition, the metal pipe is obliquely closed at its tip end with an inclined surface having an angle of 30 ° to 90 ° with respect to the axial direction of the pipe. It is preferable to have a refractory kneaded material inlet that opens to more than half of the circumferential direction.

  According to the present invention, when the remaining size of the tuyere bricks reaches a predetermined thickness, an emergency repair is performed instead of transshipment of the tuyere bricks, and the copper smelting process is performed without stopping the burner for a long time. You can continue. Therefore, by repairing tuyere bricks according to the present invention, and particularly by repeating a plurality of times, the number of tuyere brick transshipment operations can be reduced, and efficient production and cost reduction can be achieved.

  In the method of the present invention, when the brick near the tuyere is damaged and the remaining size of the damaged part is about 30 to 40 cm, the tuyere is not replaced with the tuyere brick but the metal pipe is moved from the outside of the furnace. The refractory kneaded material composed of mortar and refractory powder is poured through the metal pipe, and the damaged portion of the tuyere brick is filled with the refractory kneaded material. The poured refractory kneaded material is sintered and solidified according to the furnace temperature, and becomes a solid refractory in a form that fills the damaged part of the tuyere brick, so that the damaged tuyere brick can be repaired without reloading .

  The copper refining furnace in which the tuyere bricks are repaired by the method of the present invention can be used for the copper smelting process as it is, and the copper smelting can be repeated. Note that repaired bricks and solid refractories are damaged when copper smelting is repeated, and therefore, it is necessary to repair by replacing bricks at an appropriate time. However, by performing the repair by the method of the present invention, it is possible to greatly reduce the frequency of brick transshipment compared to the conventional case.

  In the refractory kneaded material composed of mortar and refractory powder, the weight ratio of mortar: refractory powder is in the range of 1: 1 to 3: 1. If the weight ratio of mortar is higher than mortar: refractory powder = 1: 1, the viscosity of the refractory kneaded material will be low, and the refractory kneaded material poured from the pipe will not stay in the damaged part of the brick, so the repair effect will be obtained Absent. On the other hand, when the weight ratio of mortar is lower than mortar: refractory powder = 1: 3, the fluidity of the refractory kneaded product is lowered and cannot be poured from the pipe. The refractory powder used for the refractory kneaded material is not particularly limited, but it is simple and preferable to use a powder obtained by pulverizing refractory brick used for construction of the furnace.

  Next, a method for repairing tuyere bricks according to the present invention will be described in detail with reference to FIG. When repairing damage to the brick 2 near the tuyere, empty the molten copper in the furnace, turn off the heat-burning burner, insert the tuyere pipe 8 into the tuyere 6, and insert metal into the tuyere pipe 8 The pipe 9 is inserted into the furnace, and an appropriate length is inserted and fixed so that the fireproof kneaded material 10 flows into the damaged part. In this state, the copper refining furnace is rotated, and is fixed at a position where the tuyere 6 of the copper refining furnace is directly below the furnace as much as possible.

  On the other hand, mortar and refractory powder are kneaded in advance at a weight ratio of mortar: refractory powder = 1: 1 to 3: 1 to prepare a refractory kneaded product. This refractory kneaded material 10 is sent to the metal pipe 9 by the pump 11 and poured into the damaged portion of the brick 2 in the furnace. The refractory kneaded material 10 poured into the furnace is sintered and solidified according to the temperature in the furnace and filled so as to fill the damaged part. Thereafter, the copper refining furnace is rotated and returned to the original position, the metal pipe 9 is extracted, and the repair work is completed. In addition, the material of the said metal pipe should just be what can endure the temperature in the furnace at the time of repair, and various alloys, such as stainless steel other than iron, can be used.

  In the above repair work, if it takes time from the insertion of the metal pipe to the pouring of the refractory kneaded product, seizure occurs on the metal pipe, and if the refractory kneaded product is poured into the baked metal pipe, it is solidified. May cause clogging of the pipe. For this reason, as shown in FIG. 3, the air supply port 12 is attached to the rear end portion of the metal pipe 9, the metal pipe 9 is fixed to the tuyere 6, and then immediately before the fireproof kneaded material 10 is poured It is preferable to flow air into the metal pipe 9 from the outside air supply port 12 to prevent temperature rise and seizure of the metal pipe 9.

  Thereafter, if the supply of air is stopped and the refractory kneaded material 10 is poured, even if a certain amount of time is required during this time, the metal pipe 9 is not so hot that it can be baked. It smoothly passes through the pipe 9 and fills the damaged part from the refractory kneaded material inlet at the tip without any trouble. Therefore, even if it takes time to insert the refractory kneaded material 10 after inserting the metal pipe 9 into the tuyere, the refractory kneaded material 10 flowing in the metal pipe 9 is not sintered and solidified in the middle. Clogging of the refractory kneaded product 10 can be prevented.

  As shown in FIG. 4, the tip of the metal pipe 9 is obliquely closed by an inclined surface 13 that forms an angle θ of 30 ° to 90 ° with respect to the axial direction of the pipe, and the tip is closed. It is preferable to have the refractory kneaded material inlet 14 opened over the half of the circumferential direction of the metal pipe 9 on the side of the pipe on the inclined surface 13 side before the portion. As a result, the refractory kneaded material flowing toward the tip of the metal pipe 9 hits the tip closed portion and is pushed back obliquely rearward along the inclined surface 13, so that the refractory kneaded material inlet 14 as shown in FIG. It flows out downward (to the rear end side of the metal pipe 9) and easily flows into the damaged portion of the brick 2.

  In FIG. 4, the angle θ formed by the inclined surface 13 is about 45 °, and the refractory kneaded material injection port 14 is opened beyond half of the circumferential direction of the metal pipe 9. The present invention is not limited by these. In practice, the angle formed by the inclined surface and the opening of the refractory kneaded material inlet should be adjusted appropriately according to the positional relationship between the damaged part of the brick and the metal pipe, the remaining size of the tuyere brick before repair, etc. Can do.

[Example 1]
The copper refining operation was repeated using an actual copper refining furnace. At that time, when the remaining size of the tuyere brick becomes about 30 to 40 cm, the remaining size after the repair becomes 50 cm or more by carrying out the repair work according to the present invention without performing the brick replacement work. Repaired.

  As shown in FIG. 3, the repair of the tuyere brick according to the present invention includes tuyere pipe 8 and metal pipe 9 in tuyeres 6 of a copper refining furnace in which the molten copper in the furnace is emptied and the warming burner is turned off. Is inserted and fixed, and the copper refining furnace is rotated and fixed to the position where the tuyere 6 is as low as possible, and then the refractory kneaded material 10 of mortar: refractory powder = 2: 1 (weight ratio) This was supplied to the pipe 9 and poured into the damaged part of the brick 2. Thereafter, the copper refining furnace was rotated and returned to the original position, and the metal pipe 9 was extracted to complete the repair work.

  After the repair of the tuyere brick according to the present invention described above, the copper refining operation was repeated and the number of copper refining operations that could be carried out until the remaining size of the tuyere brick was about 30 to 40 cm was investigated again. did. Table 2 below shows the number of copper refining operations that could be carried out after two repairs according to the present invention.

  In addition, the time required for the brick replacement work, which is a conventional repair method, is usually 6 hours or more excluding the cooling of the furnace before the work and the heating time of the furnace after the work, but the repair method according to the present invention is used. The time required is only about 2 hours, and it has been found that the downtime of the copper refining furnace is also greatly reduced.

[Example 2]
The repair work according to the present invention is repeated in the same manner as in Example 1 above without performing any brick replacement work every time the remaining size of the tuyere brick becomes about 30 to 40 cm, and the remaining size after repair is 50 cm. The copper refining operation was repeated while repairing as described above.

  By repeating the repair work and the copper refining operation according to the present invention, it is impossible to repair only by the repair work according to the present invention, and the number of copper refining operations that can be carried out before the brick replacement work is finally required. investigated.

  As a result, by continuing the copper refining operation while repeating the repair work according to the present invention, it was possible to repeat the copper refining operation at least 25 times and a maximum of 27 times before the transshipment work of tuyere bricks was required. .

It is the copper refining furnace which made the furnace port the upper part, (a) is a schematic plan view, and (b) is a schematic sectional drawing. It is general | schematic sectional drawing which shows the damaged part before repair of a tuyere brick. It is a schematic sectional drawing which shows the tuyere vicinity for demonstrating the repair method of the tuyere brick by this invention. It is general | schematic sectional drawing which shows the front-end | tip part of the metal pipe used for this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Furnace 2 Brick 3 Burner hole 4 Smoke exhaust hole 5 Furnace port 6 Tuyere 7 Tap hole 8 Tubular pipe 9 Metal pipe 10 Refractory kneaded material 11 Pump 12 Air supply port 13 Inclined surface 14 Refractory kneaded material inlet

Claims (3)

  When repairing the tuyere brick of a copper refining furnace, insert the metal pipe into the tuyere from the outside of the furnace without replacing the tuyere brick, and rotate the furnace so that the tuyere is below the furnace. After that, a refractory kneaded material having a mortar: refractory powder weight ratio of 1: 1 to 3: 1 is poured through a metal pipe, and the damaged portion of the tuyere brick is filled with the refractory kneaded material. Repair method for refined furnace tuyeres bricks.   The method for repairing a copper refining furnace tuyere brick according to claim 1, wherein an air supply port for supplying cooling air into the metal pipe is attached to a rear end portion of the metal pipe. .   The tip of the metal pipe is obliquely closed with an inclined surface that forms an angle of 30 ° to 90 ° with respect to the axial direction of the pipe. The method for repairing a copper refining furnace tuyere brick according to claim 1 or 2, comprising a refractory kneaded material inlet that is opened to half or more.

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