JP5790928B2 - Repair method for refractory lining of hot metal transfer container - Google Patents

Description

  The present invention relates to a method for effectively repairing damage inevitably caused in a lining refractory of a hot metal transfer container.

  The hot metal transfer container such as a kneading wheel or hot metal ladle that transports the hot metal discharged from the blast furnace has a lining refractory inside the furnace body, so that high temperature hot metal can be stably held. It is like that.

  By the way, in the hot metal transport container, processing for removing the impurity elements in the hot metal is performed simultaneously with the transport of the hot metal, and the inside thereof is in a harsh environment, and the refractory lining is worn and damaged. In an inevitable situation.

  In particular, in a chaotic vehicle having a horizontally long and cigar-shaped shape, it is difficult to repair the damaged part due to its shape, the part corresponding to the slag line, or the ceiling near the furnace port (receiving port, dock) The wall is severely damaged.

  As a conventional technique for coping with such damage to the lining refractory, Patent Document 1 describes that a refractory material and water are previously kneaded into a paste state, and this has a construction thickness of 150 mm or less per time. In addition, a wet spraying method is disclosed in which the construction range is set above the hot metal level and sprayed to the repair site.

In Patent Document 2, Al ash containing metal Al: 30 to 55 (weight)%, Al ₂ O ₃ : 10 to 50%, and SiO ₂ : 15% or less is used as an anti-melting agent. Therefore, a method is disclosed in which the life of the hot metal container is extended by covering the base of the hot metal container lined with refractory bricks with the Al ash.

JP-A-11-229018 JP 2000-54015 A

  However, the method disclosed in Patent Document 1 relates to a technique intended for cold repair, and since the person is working in the container during repair, efficient repair is performed. There is a problem that the operating rate of the hot metal transfer container is inevitably lowered.

Further, the method disclosed in Patent Document 2 is to sinter Al ₂ O ₃ and SiO ₂ in Al ash using the radiant heat of the hot metal container, thereby forming a repair layer. However, since the injection of Al ash is carried out in a bag and thrown into the hot metal container, it is limited to repairing only the floor (bottom), and the part corresponding to the slag line and the furnace port When a nearby ceiling part is damaged, there remains a problem that it is difficult to effectively deposit Al ash on the part.

  Accordingly, an object of the present invention is to propose a method capable of efficiently and accurately repairing the damage inevitably caused in the refractory lining the hot metal transport container regardless of the occurrence location. is there.

The present invention has been made in order to solve the above-described problems, and its specific configuration is that damage to the lining refractory is made by introducing a repair material into the hot metal transfer container after the hot metal has been dispensed. a method of repairing a part, as the repair material includes a pitch _{10~25mass%, Al 2 O 3:} 45~65mass%, SiO 2: a monolithic refractory containing a range of 10～25Mass% used, The hot metal transport container promotes softening and fluidization of the repair material by the retained heat of the hot metal transport container, and then forms the repair layer by pouring the repair material into the damaged portion of the lining refractory. This is a repair method for lining refractories.

In the repair method of the refractory lining the hot metal transport container having the above-described configuration,
(1) The damaged portion of the lining refractory is a site that is difficult to repair,
(2) The repair difficult part is a part corresponding to a slag line of a kneading vehicle that is a hot metal transport container and / or a ceiling part near the furnace port,
(3) The repair difficult part is a side wall part of a hot metal ladle which is a hot metal transport container. (4) The repair material is poured by tilting / tilting of the hot metal transport container including a kneading wheel and a hot metal ladle. Being
(5) Applying an amorphous refractory having a softening start temperature of 700 to 800 ° C. as the repair material,
Is preferable as a specific means for solving the problems of the present invention.

  According to the present invention having the above-described configuration, the heat of the hot metal transfer container is used to promote softening and fluidization of the repair material, and the fluidized repair material is poured into the damaged portion of the lining refractory for repair. Since the layers are formed, it is not necessary for a person to enter the container to work. In addition, the repair can be dealt with hot, and a reduction in the operating rate of the hot metal transfer container can be avoided.

  Moreover, according to said repair method which concerns on this invention, the repairing in the damaged part of the said lining refractory material, especially a repair difficult part is enabled, and the lifetime of a hot metal conveyance container can be extended.

  Further, according to the above repair method according to the present invention, the repair difficult part is a part corresponding to the slag line of the kneading vehicle and / or a ceiling part near the furnace port, and the repair layer in this part By the formation, it is possible to extend the life of the hot metal transfer container.

  Moreover, according to said repair method which concerns on this invention, even if the said repair difficult site | part is a side wall site | part of a hot metal ladle, it can repair easily.

  Furthermore, according to the above repair method according to the present invention, the softened and fluidized repair material is poured into the damaged part by tilting / tilting the container itself, for example, like a chaotic car. Even if a difficult-to-repair part such as a ceiling part near the furnace opening, a part corresponding to the slag line, or a side wall part of the hot metal ladle is damaged, repair material can be supplied to that part and reliable repair can be performed. .

  Moreover, according to the repair method of the present invention, by using an amorphous refractory that starts to soften in a temperature range of 700 to 800 ° C. and exhibits fluidity, a very short time after the introduction of the repair material is obtained. In addition to softening and fluidizing, it is possible to form a repair layer, which requires less work time for repair and contributes to an improvement in the operating rate of the hot metal transport container.

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed typically the hot metal conveyance container (mixing wheel) suitable for implementing this invention, (a) is the figure which showed the side surface in cross section, (b) is the figure of (a). It is the figure which showed the AA cross section. It is the figure which showed the repair condition of the hot water contact part of a lining refractory. It is the figure which showed the repair condition of the slag line corresponding | compatible part of a lining refractory, and a ceiling site | part. It is the figure which showed typically other hot metal conveyance containers (hot metal ladle) suitable for implementing this invention. It is the figure which showed the repair condition of the hot metal conveyance container shown in FIG.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
1 (a) and 1 (b) are diagrams schematically showing a hot metal transfer container (mixing wheel) suitable for use in carrying out the present invention, and FIG. FIG. 2B is a view showing a cross section AA of FIG.

  In the figure, reference numeral 1 is a horizontally long, cigar-shaped furnace body (iron skin) that forms the basic skeleton of a kneading vehicle, 2 is a refractory lining laid inside the furnace body 1, and 3 is a furnace for taking in and out hot metal The mouth. In the present invention, the lining refractory means a work brick layer or an indeterminate refractory layer applied on a permanent brick layer, although not shown.

  Although the specific structure of the chaotic wheel having the above-described structure is not shown, it can be tilted and tilted around the axis L.

  In order to repair a damaged portion of a chaotic vehicle according to the present invention, first, slag and bullion adhering to the inside of the chaotic vehicle are removed after the hot metal has been dispensed and emptied.

  And, when the damaged part of the lining refractory is the so-called hot water hitting part U that collides first at the time of receiving, the chaotic vehicle is maintained in the receiving position, as shown in FIG. A predetermined amount of repair material 4 is thrown at the target site.

  The repair material 4 thrown into the furnace body 1 is softened and fluidized by the heat (the temperature inside the kneading car after the hot metal discharge is finished is 800 ° C. or more), and the damaged portion The repair layer 5 is formed in a short time due to the baking. In this case, tilting / tilting of the chaotic vehicle is omitted.

  If the damaged part of the lining refractory is a part difficult to repair (see FIG. 1) such as the corresponding part of the slag line S or the ceiling part M in the vicinity of the furnace mouth (see FIG. 1), as shown in FIG. A predetermined amount of repair material 4 is thrown into the interior of the furnace body 1 while maintaining the receiving posture.

  Then, when the repair material 4 thrown in is softened and fluidized, the furnace body 1 is tilted and tilted to a predetermined angle. Due to the tilting / tilting of the furnace body 1, the fluidized repair material 4 flows toward the slag line S or the ceiling part M in the vicinity of the furnace mouth, and the repair layer 5 is formed by baking over time. .

  In the present invention, as described above, the repair material 4 is thrown into the hot metal transfer container, and when the repair material 4 is softened and fluidized, the repair material 4 is poured into the recessed portion which is a damaged portion and baked. Therefore, efficient repair is possible.

  FIG. 4 is a diagram schematically showing the hot metal ladle with respect to the cross section of the side surface thereof. In the figure, reference numeral 6 is a pan body (iron skin), 7 is a refractory lining laid on the inside of the pan body, and 8 is a tilting / tilting shaft (Tranion) for tilting / tilting the hot metal pan. ).

  In the hot metal ladle having such a configuration, particularly when the damaged portion V is present in the side wall portion, it is difficult to repair it hot. However, in the present invention, after the repaired material 4 that has been cast is softened and fluidized, the hot metal ladle is tilted and tilted as shown in FIG. 5 so that the damaged part is softened and fluidized. Since the repair layer 9 can be formed by pouring 4 and the repair material 4 for pouring, the damaged portion V can be repaired easily.

  In the present invention, it is preferable to use an amorphous refractory having a softening start temperature of 700 to 800 ° C. as the repair material. The reason for this is that the temperature in the hot metal transport container after the hot metal is discharged is about 800 to 900 ° C., thereby making it possible to effectively use the heat of the kneading vehicle.

In particular, an amorphous refractory containing a pitch of 10 to 25 mass% as a binder and containing Al ₂ O ₃ : 45 to 65 mass% and SiO ₂ : 10 to 25 mass% is placed in a temperature range of 800 ° C. or higher. Then, it begins to soften in about 2 to 3 minutes, fluidizes, and then baked by holding for about 10 minutes, so that a repair layer is reliably formed on the damaged part of the lining refractory even in an invisible working environment It is possible to carry out repair work.

  In repairing the chaotic vehicle, the chaotic vehicle is tilted by 180 degrees or more to remove the remaining slag and metal in the chaotic vehicle in advance, and then the repair material 4 is introduced.

  As a form of the repair material 4, it is preferable to use a granular material for quick softening after the charging and fluidization by the softening.

  In addition, when the repair material 4 is introduced, a predetermined amount of the repair material 4 may be packed and thrown into the hot metal transport container as it is. As the bag, a plastic bag, a fiber bag, or a paper bag can be used.

  Although not shown in the figure, when the repair material 4 is accurately placed in a site far from the furnace port 3, for example, a dedicated chute that can appropriately change the repair material placement position by moving the carriage is used. Good.

The refractory lining of a 300-ton mixed chaotic vehicle having the structure shown in FIGS. 1A and 1B after the hot metal has been dispensed, the part corresponding to the slag line, the ceiling in the vicinity of the furnace port 3 4 kg repair material (component composition: Al ₂ O ₃ : 60%, SiO ₂ : 20%, pitch: 10%, balance is CaO, Fe ₂ O ₃ , 20 bags filled with (made of metal Al powder) were charged, and the repair work for tilting and tilting the furnace body was performed, and the repair status was investigated (visually in the cold).

  The temperature inside the furnace body when the repair material was charged was 850 ° C., and a dedicated chute was used to improve the accuracy of the repair material charging position.

  Further, in forming the repair layer, after the repair material was put in, it quickly tilted and the repair material was poured into the recess, and the posture was maintained for about 15 minutes and the repair material was baked.

  As a result, it was confirmed that due to the flow of the repairing material itself, the repairing material appropriately flows into the recess, and a deposition layer (repairing layer) of the repairing material is formed at that portion.

  According to the present invention, since the refractory lining can be repaired in a state where hot metal has been dispensed (hot), the operating rate of the hot metal transport container can be improved and the life of the hot metal transport container can be extended. It becomes possible.

DESCRIPTION OF SYMBOLS 1 Furnace 2 Lined refractory 3 Furnace port 4 Repair material 5 Repair layer 6 Hot metal ladle body 7 Lined refractory 8 Tilt and tilt axis 9 Repair layer S Part corresponding to slag line L Core core M Ceiling part U Hot water contact part V Damaged part

Claims (6)

In the method of repairing the damaged part of the refractory lining by putting a repair material into the hot metal transport container after the hot metal has been dispensed,
As the repair material, an amorphous refractory containing a pitch of 10 to 25 mass%, containing Al ₂ O ₃ : 45 to 65 mass%, SiO ₂ : 10 to 25 mass%,
The hot metal transport container promotes softening and fluidization of the repair material by the retained heat of the hot metal transport container, and then forms the repair layer by pouring the repair material into the damaged portion of the lining refractory. Repair method for lining refractories.   The damaged part of the lining refractory is a repair difficult part, The repair method of the lining refractory of the hot metal conveyance container according to claim 1 characterized by things.   The method for repairing a lining refractory of a hot metal transport container according to claim 1 or 2, wherein the repair difficult part is a part corresponding to a slag line of a kneading vehicle and / or a ceiling part near the furnace port.   The method for repairing a refractory lining the hot metal transport container according to claim 1, wherein the repair difficult part is a side wall part of the hot metal ladle.   The method for repairing a refractory lining the hot metal transport container according to any one of claims 1 to 4, wherein the pouring of the repair material is caused by tilting or tilting of the hot metal transport container.   The said repair material is an indefinite shape refractory whose softening start temperature is 700-800 degreeC, The repair method of the lining refractory of the hot metal conveyance container described in any one of Claims 1-5 characterized by the above-mentioned.

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