JP3606954B2 - Baking repair material package and hot repair method for molten metal container using the same - Google Patents

Description

[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to a package of a repairing material for baking used for hot repair of a molten metal container and a repair method using the same.
[0002]
[Prior art]
Conventionally, baking repair materials are known as hot repair materials for molten metal containers such as converters, AOD furnaces, electric furnaces, and LF pans (JP-A 61-183176, etc.).
When the baking repair material is put into the molten metal container, it receives the residual heat of the container, fluidizes due to softening of the binder, fills the repaired portion of the lining, and then is baked by carbonization or curing of the binder. Since this baking repair material is an irregular refractory material, it is transported in a bag and put into the container in a state where it is also put in the bag. The bag burns out due to residual heat and does not interfere with the repair material.
[0003]
[Problems to be solved by the invention]
However, since the baking repair is a hot work, it is not easy to accurately put the baking repair material into the repaired part. Immediately after being put in a position outside the repaired part, the bag is burnt out and burned in place without reaching the repaired part.
Moreover, if the amount per bag is increased in order to increase the efficiency of conveyance and repair work, the strength of the bag must be increased from the viewpoint of safety. However, when the strength is increased, the bag naturally increases in thickness, and after being put into the container, it does not easily burn out even if it receives residual heat, and is cured without being filled by softening of the baking repair material.
[0004]
[Means for Solving the Problems]
The present invention solves the above-mentioned conventional problems in the repair of baking.
The present invention is a package for a baking repair material comprising a burnable container bag containing a baking repair material and a burnable hard cylinder holding the container bag. Moreover, it is the hot repair method of the molten metal container which rolls the packing body of this baking repair material on a furnace wall surface, and reaches | attains a to-be-repaired part.
[0005]
[Action]
According to the present invention, the container bag and the rigid cylinder holding the container bag are tightly integrated by the squeezing pressure due to the weight of the baking repair material, and even if the container bag is not particularly thick, the entire packaging body is formed by the rigid cylinder. With sufficient strength. Thereby, for example, it is very preferable in terms of handling convenience or work safety such that stacking and storage are possible.
[0006]
In addition, since the outer shape of the hard cylinder is columnar, it is possible to reach the concave portion of the repaired portion by rolling on the wall surface of the container during lining repair. For example, the converter is repaired in a state where it is laid down, but if the tilting when the furnace is rebuilt is used, the package of the repair material for baking will roll without any external force and will naturally be damaged. Reach the recess.
[0007]
During this rolling, the packing body comes into contact with the high-temperature wall surface, but the packing body of the baking repair material of the present invention is protected against heat by the hard cylinder and reaches the damaged part while maintaining the columnar shape. When the package of the baking repair material reaches the repaired part, the hard cylinder and the container bag are burned by receiving residual heat, and the repaired material is baked after filling the repaired part by the flow of softening.
[0008]
Since the residual heat of the molten metal container is generally a high temperature around 1000 ° C., the hard cylinder is burned out regardless of its thickness, but if the thickness is too large, the burning is delayed. In that case, if the upper and / or lower part of the hard cylinder is opened, the baking repair material will soften and flow out of the opening, and even if the burning of the hard cylinder is delayed, the baking repair material will harden without flowing out. There is no.
[0009]
【Example】
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 are packing bodies of a repairing material for baking according to an embodiment of the present invention, FIG. 1 is a perspective view, and FIG. 2 is a front sectional view. In the package (1) of the baking repair material of FIG. 1 and FIG. 2, the storage of the baking repair material (3) in the container bag (2) is performed by placing the container bag (2) in the burnable hard cylinder (4). It is preferable to carry out in the state.
[0010]
The container bag (2) and the burnable hard cylinder (4) are firmly integrated with each other by the pressure of the stored baking repair material (3) due to its own weight. For example, when transported, the container bag (2) is attached to the container bag (2). You may carry out by hanging with the hanging string (5).
The material of the baking repair material (3) is not particularly different from the conventional baking repair material. That is, a binder such as tar, synthetic resin, silicate, and phosphate is added to the refractory aggregate. The ratio of the binder is, for example, 5 to 50 wt% as an inner portion of the entire baking material, and is determined in consideration of the type of binder, the residual heat temperature, and the like within this range.
[0011]
The binder has the effect of burning the repaired material to be repaired by carbonizing or hardening after the fluidized softening material is filled in the repaired part by thermal softening.
Specific examples of tar include pitch and asphalt. Specific examples of the synthetic resin are phenol resin, furan resin, epoxy resin, melamine resin, urea resin, and xylene resin. These tars or synthetic resins may be used after adding a solvent, if necessary. Silicates include crystallization water such as sodium metasilicate-9 hydrate and phosphates such as disodium hydrogen phosphate 12 hydrate.
[0012]
The refractory aggregate used for the baking repair material (3) is, for example, refractory materials such as alumina, silica, alumina-silica, magnesia, calcia, magnesia-calcia, spinel, zircon, zirconia, carbon, silicon carbide, nitride, chromium, etc. The main material is one or more selected from Of these, basics such as magnesia, calcia, and magnesia-calcia, which are excellent in corrosion resistance, are preferable. Moreover, you may use a part or all of aggregate for the goods after using furnace materials which made these the main materials. The particle size is adjusted to coarse particles, medium particles, and fine particles so that a close packed structure can be obtained. For the purpose of preventing cracks, a part of the particles may be coarse particles having a particle size of about 30 mm.
[0013]
The baking repair material (3) may further contain a curing accelerator, a curing retarder, a sintering agent, a metal powder, an antioxidant, a dispersant, an organic fiber, an inorganic fiber, a metallic fiber, and the like.
The material of the container bag (2) for storing the baking repair material (3) is not particularly different from the conventional material. For example, it is soft and flexible such as a normal commercially available product made of polypropylene, vinyl chloride, synthetic / natural rubber, or cloth. It shall have the property. The thickness is, for example, 0.5 mm or less.
[0014]
The burnable hard cylinder (4) is made of a flammable material such as paper or plastic. Paper is preferable from the viewpoint of economy. The dimensions are, for example, an inner diameter of 300 to 1200 mm and a height of 400 to 1500 mm in accordance with the amount of the built-in baking repair material. The thickness is, for example, 2 to 15 mm, preferably 3 to 6 mm, in order to impart heat resistance and shape retention.
The burnout hard cylinder (4) is not a cylindrical shape from the beginning, for example, even if the horizontal cross section has a rectangular shape, as long as it has a cylindrical shape due to the squeezing pressure of the stored baking repair material due to its flexibility. May be.
[0015]
The upper and lower parts of the burnable hard cylinder (4) may be covered, but when opened as shown in the figure, even if the hard cylinder (4) burns out later, the seizure repair material (3) is removed from the open part at an early stage. Can be drained into. Moreover, when covering the upper part and the lower part of a hard cylinder (4), it is preferable to carry out with the material which burns down easily by reducing thickness.
FIG. 3 schematically shows a hot repair method for a molten metal container using the packing body (1) of the baking repair material of the present invention.
[0016]
As shown in FIG. A, the packing body (1) of the repair material for baking is put on the wall surface from the upper opening of the molten metal container (6) through the chute (7). Next, it rolls using the external force by the push rod or the inclination of the wall surface to reach the repaired part. In this case, when the molten metal container (6) can be tilted as in a converter, ladle, etc., as shown in Fig. B, if the tilting when the container is rebuilt is used, the packing body (1) for the repairing material for baking is covered. It naturally reaches the recess that is the repair part.
[0017]
Next, an actual machine test of a packing body for a repairing material for bake according to an embodiment of the present invention and a hot repairing method using the same is shown.
A container container made of polypropylene having a thickness of 0.3 mm is accommodated in a burnable hard cylinder made of a paper tube having a thickness of 5 mm, an inner diameter of 800 mm, and a height of 1000 mm. Next, the sintered magnesia clinker is 80 wt% and the pitch is 20 wt%. The resulting baking repair material was incorporated in 1 t to obtain a package of the baking repair material. Although the baking repair material is an irregular refractory, it can be stacked by reinforcement of a hard cylinder, which is convenient for storage or transportation.
[0018]
Also, in hot repair of the converter, the packaging body of the above-mentioned baking repair material is dropped with a chute on the side wall of the converter, which is tilted sideways, and the repaired part is repaired by using the inclined surface of the side wall to repair the lower part of the side wall. The package of materials was reached. The residual heat of the furnace wall was 1200 to 1400 ° C., and the baking repair material reached the part to be repaired and then softened and flowed out of the hard cylinder in the package due to the burning of the container bag, and the hard cylinder was also burned out. The baking repair material was baked onto the repaired portion by pitch carbonization, and the furnace lining could be repaired.
[0019]
【effect】
The effects of the present invention are enumerated as follows.
(1) The container bag and the hard cylinder holding the container bag are tightly integrated by the pressure of the baking repair material due to its own weight, and the entire package has sufficient strength. It is extremely preferable in terms of handling convenience and work safety, such as storage and transfer.
(2) Since the baked repair material is a hard cylinder and the outer shape is cylindrical, it can roll on the wall surface to reach the repaired part during lining repair. For example, in the case of tiltable molten metal containers such as converters and ladles, if the tilting when the container is rebuilt is used, the package of the baking repair material rolls without applying external force and naturally reaches the non-repaired part. To do.
[0020]
(3) While rolling on the wall surface, the packing body comes into contact with the hot wall surface, but the packing body of the repair material for baking is protected against heat by a hard cylinder, and by maintaining the columnar shape, the rolling body can be repaired by rolling. Can be reached.
{Circle around (4)} If the upper and / or lower portions of the hard cylinder are opened, the seizing repair material can flow out from the open portion at an early stage even when the burning of the hard cylinder is delayed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a packing body for a baking repair material according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a packing body for a baking repair material according to an embodiment of the present invention.
FIG. 3 shows a hot repair method for a molten metal container using a packing body for a repairing material according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packing body of repair material 2 Container bag 3 Repair material 4 Burning hard cylinder 5 Suspension string 6 Molten metal container 7 Chute

Claims (4)

A package of a burn-in repair material comprising a burn-out container bag containing a bake repair material and a burn-out hard cylinder holding the container bag. The packing body of the baking repair material according to claim 1, wherein an upper and / or lower portion of the burnable hard cylinder is open. The packing body of the repair material for baking according to claim 1 or 2, wherein a hanging strap is provided on the container bag. The hot repair method of the molten metal container which rolls the package body of the baking repair material of Claim 1, 2, or 3 on a furnace wall surface, and arrives at a to-be-repaired part.

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