JP2633146B2 - Spray repair method for industrial kiln - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for facilitating observation of the discharge state and adhesion state of a spray material in spray repair of an industrial kiln.

[0002]

2. Description of the Related Art Spray repairing of linings of industrial kilns such as converters, ladles, blast furnaces, tapping gutters, mixed iron wheels, vacuum degassing furnaces, and tundishes has been performed. This repair includes cold spraying performed after the surface to be repaired is sufficiently cooled, and hot spraying performed in a high temperature state. The material of the spraying material used for this includes a refractory aggregate, a binder and the like.
For example, Japanese Patent Publication No. Sho 45-12503, Japanese Patent Publication No. Sho 61-
17791 and the like.

[0003]

When the sprayed material is close to the color of the surface to be repaired, it is determined whether or not the sprayed material ejected from the nozzle is sufficiently mixed with the added water, or the sprayed material adheres. It is not easy to confirm the position and adhesion status. For example, when the spray material is white or a color close to white, the surface to be repaired in hot spray is colored white due to high temperature, and the color with the spray material is assimilated with the color of the surface to be repaired, as described above. Problems are easy to occur. For example, in the hot spray repair of a converter, a long spray nozzle of 10 m or more is used, and the distance from the position of the spray operator to the tip of the nozzle is too long, which makes it difficult to observe the adhesion state. is there.

[0004]

SUMMARY OF THE INVENTION The present invention is a spray repair method characterized by using a spray material to which a coloring agent is added. In the present invention, by adding a colorant to the spray material, it is easy to distinguish the repair target surface from the spray material by color discrimination. As a result, whether or not the spray material is in a state of being sufficiently mixed with the added water, the adhesion position and the adhesion state of the spray material can be accurately grasped, and efficient spray repair can be performed.

[0005] Pigments or dyes can be used as the colorant to be added to the spraying material used in the present invention. For example, as white, titanium white (TiO ₂ ), zinc white (ZnO), lead white [2P
bCO ₃ .Pb (OH) ₂ ]. Examples of black include carbon black (C) and iron black (Fe ₃ O ₄ ). The red color
Bengala (Fe ₂ O ₃ ), silver vermilion (HgS), and cadmium red (CdS.nCdSe). In addition, pale yellow graphite (PbCrO ₄ ), red blue to purple blue ultramarine (2Al ₂ N
a ₄ Si ₃ O ₁₀ S ₄ ), blue cobalt blue (CoO.nA)
l ₂ O ₃ ) and green chromium oxide (Cr ₂ O ₃ ).

The above are inorganic pigments, but organic pigments may also be used. For example, red quinacridone, watch ang red, purple dioxazine violet, and the like. It is necessary that the dye be mixed with the refractory powder in a dry powder form, and then rapidly develop a color by adding water, and a direct dye, an acid dye, a basic dye, a food colorant, or the like is preferable. For example, as red, Brilliant Scarlet 3
R (Brilli-ant Scarlet 3R),
Red No. 102 for food, blue is Direct Sky Blue 5
B (Direct Sky Blue 5B), yellow is auramine, black is direct fast black B (DirectFast Black)
B).

Since inorganic pigments have better heat resistance than organic pigments and dyes, it is preferable to use inorganic pigments for hot spraying.

[0008] The amount of the colorant added is not particularly limited. It is appropriately adjusted depending on the color of the spray material, the coloring ability of the coloring agent, and the like. Generally, 0.01 to 0.5% by weight is preferred. If the amount is too small, the coloring becomes insufficient, and if the amount is too large, the cost increases.

The spraying material used in the present invention is the same as the conventional material except that a coloring agent is added. The refractory aggregate is mainly composed of, for example, magnesia clinker, dolomite clinker, lime clinker, spinel clinker, alumina clinker and the like. The binder is alumina cement, Portland cement, phosphate, silicate or the like. Hardening accelerators for the binder include slaked lime, quicklime, magnesia fine powder, aluminum sulfate, magnesium sulfate and the like.

[0010] In order to widen the upper and lower limits of the amount of sprayed water,
If necessary, clay, dextrin, sodium alginate, CMC, MC, PVA, sepiolite, water-absorbing polymer, organic fiber, inorganic fiber, metal fiber and the like are added as a thickener.

[0011]

EXAMPLES Examples and comparative examples of the present invention will be described below.
Table 1 shows the composition of the spraying material used in each example and the test results. Each example is a magnesia clinker 3 to 1 mm
30% by weight, magnesia clinker 1 mm or less
35% by weight, magnesia clinker 0.15 mm or less
As shown in Table 1, different types of coloring agents were added to a spraying material having a composition of 3% by weight, 3% by weight of sodium hexametaphosphate, and 2% by weight of slaked lime.

In the test, cold spraying was performed on alumina-
This was carried out by spray repair of a 200t molten steel ladle lined with a spinel-shaped irregular refractory. Hot repair was performed by spray repair of a 200 t converter lined with magnesia-graphite brick. Color of spraying material; color after mixing with added water was examined. Effect by color discrimination: It was examined whether it was easy to determine the mixing state of the spraying material with the added water and the adhesion state. ○… easy,
Δ: Relatively easy, ×: Difficulties were evaluated.

From the results shown in Table 1, it can be seen that the embodiment of the present invention shows that even when the surface to be repaired is white or when the inside of the furnace is white due to hot spraying, the colorant is added to the sprayed material. Both the mixing state and the adhesion state of the added water could be easily observed.

When the spray material in the spray gun runs out, only the added water is discharged. However, the coloring of the spray material makes it possible to determine immediately whether or not only the added water has been jetted out, and the completion of spraying can be accurately determined. Was. In addition, since the position and condition of the sprayed material can always be accurately and quickly grasped during spraying work, spraying repair is extremely efficient, such as shortening repair time and reducing repair material loss. It became something.

On the other hand, a comparative example corresponding to the conventional method is as follows.
Especially in hot spraying, since the sprayed material is white, it is not easy to distinguish between the sprayed material and the surface to be repaired, and it is not possible to accurately determine the end of the spraying, and use more spraying material than necessary. The result was.

In the embodiment shown in Table 1, the sprayed material and the surface to be repaired are colored when the sprayed material is white. However, the present invention is not limited to this. The colorant added to the spray material can be changed according to the color relationship. For example, when both the spray material and the surface to be repaired are black, a white colorant is added, and when the spray material and the surface to be repaired are brown, a yellow colorant is added.

[0017]

[Table 1]

[0018]

As described above, according to the method of the present invention, the workability can be greatly improved by adding a colorant to a spray material in spray repair of an industrial kiln.
As a result, the effect is extremely large, such as shortening of the spray repair time and reduction of repair material loss.

Continued on the front page (72) Inventor Naotoshi Yasuda 1-3-1 Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside Harima Ceramics Co., Ltd. (72) Inventor Yoshinobu Kambe 1-3-1 Shinama, Arai-machi, Takasago City, Hyogo Prefecture Harima Ceramics Inside the corporation

Claims (2)

(57) [Claims] 1. A spray repair method for an industrial kiln, comprising using a spray material to which a coloring agent is added. 2. The method according to claim 1, wherein the colorant is a pigment or a dye.