KR100913156B1 - A method of manufacturing castable block - Google Patents

Abstract

The present invention relates to a method for producing dense castable blocks used as internal refractories of various industrial urinary furnaces, such as steel, steel, and cement, wherein the method is a silicone resin as an additive for defoaming and defoaming when mixing an amorphous refractory composition. Preparing an amorphous refractory composition comprising one or two or more components selected from the group consisting of silicone oils, polyethylene glycols, polypropylene glycols, ester amides, amides of higher fatty acids, and lower alcohols; And a step of degassing the amorphous refractory composition by charging the vibrator into a molding mold provided on left and right sides thereof.

Castable Block, Indeterminate Refractory, Vibration, Degassing

Description

Manufacturing method of castable block {A METHOD OF MANUFACTURING CASTABLE BLOCK}

1 is a cross-sectional view of a degassing apparatus used to manufacture a castable block of the present invention.

<Description of the symbols for the main parts of the drawings>

1: degasser 3: composition inlet

5: molding mold 7: vibrator

9: amorphous fireproof composition 11: cover

13: vacuum pump

Field of invention

The present invention relates to a method for manufacturing a castable block, and more particularly, to a method for manufacturing a dense castable block used as interior refractories of various industrial urinary furnaces, such as steelmaking, steelmaking, and cement. .

Prior art

Internal refractories of various industrial urinary tracts can be classified into standard refractory bricks, irregular refractory blocks, and castable blocks. The castable block is a product made by pouring the amorphous refractory material mixed with wet shape into a mold of constant shape, curing and drying to form a regular product, and it is possible to manufacture a denser product than the amorphous refractory material, and the manufacturing cost is higher than that of the standard refractory brick. It has been in the spotlight recently because it has the advantage of being inexpensive and large in size.

Conventionally, castable blocks were prepared by pouring an amorphous refractory material mixed with a wet shape into a mold of a predetermined shape and curing and drying. However, due to the high porosity, the cast life of the castable block is low, and thus there is almost no advantage in using the amorphous refractory material. However, in recent years, a degassing vibration molding method was devised to remove air mixed in an amorphous refractory by depressurizing at a molding step, thereby making it possible to manufacture a product having a porosity close to a theoretical value.

Japanese Patent Application Laid-Open No. 11-291213 reported a method of performing vibration molding under reduced pressure using a porous molding mold having a pore size of 1 to 30 µm, but moisture and ultrafine powders in the mixture are mixed into the pores of the molding mold during the degassing process. As a result, the degassing efficiency is likely to decrease. Japanese Patent Application Laid-open No. Hei 10-34617 reported a method of increasing the degassing efficiency by simultaneously degassing and vibrating a mixing tank and a molding mold mixing amorphous refractory materials, but when degassing and vibrating the amorphous refractories in a mixing tank, 1 mm contributes to fluidity. Since the following bubbles are added to the molding mold in a removed state, there is a problem that the workability of the amorphous refractory material is lowered.

The present invention has been made to solve the above problems, an object of the present invention is to provide a method for producing a castable block that can eliminate the loss of moisture or ultrafine powder, and can achieve a sufficient degassing effect will be.

In order to achieve the above object, the present invention consists of silicone resin, silicone oil, polyethylene glycol, polypropylene glycol, ester amide, amide of higher fatty acid, and lower alcohol as an additive for defoaming and defoaming when mixing the amorphous refractory composition Preparing an amorphous refractory composition comprising one or two or more components selected from the group; It provides a method for producing a castable block comprising the step of degassing the charge of the amorphous refractory composition in the molding mold installed on the left and right sides.

Hereinafter, the present invention will be described in more detail.

Molding manufacturing method of the castable block of the present invention is prepared by adding an additive to the defoaming and defoaming action in the production of the amorphous refractory composition and the cured and dried treatment after charging the vibrator in the molding mold installed on the left and right sides. .

In the present invention, when preparing an amorphous refractory composition, one or more additives for defoaming and defoaming selected from the group consisting of silicone resins, silicone oils, polyethylene glycols, polypropylene glycols, ester amides, amides of higher fatty acids, and lower alcohols Add. The defoaming and defoaming additives serve to quickly move bubbles to the surface by destroying the existing bubbles (defoaming) when added to the aqueous slurry, or by easily adjoining the bubbles adjacent to each other (defoaming). Thus, it is easy to remove the bubbles generated when mixing the dry mixed amorphous refractory composition with water. The content of the additive for such defoaming and defoaming is preferably added by 0.05 to 0.6% by weight extrapolated to the amorphous refractory composition. If less than 0.05% by weight, there is no defoaming and antifoaming effect, and if more than 0.6% by weight, a large number of bubbles of 1 mm or less are removed in the step of mixing with water, so that the fluidity of the mixture is lowered, so that the closest filling is not performed.

A castable block is prepared by degassing an amorphous refractory composition including the defoaming and defoaming additives. The degassing molding process of the present invention will be described with reference to FIG. 1 in which a degassing apparatus 1 used in degassing molding is shown.

The amorphous refractory composition is charged into the molding mold 5 through the composition inlet 3 provided on the degassing apparatus 1. By providing the vibrator 7 on the left and right side surfaces of the molding mold 5, the pressure reduction and the vibration force are lowered. Although it is described in FIG. 1 that three vibrators are installed on the left and right sides, the number of vibrators can be easily determined by conventional techniques in the art. Conventionally, the vibrator is installed on the bottom surface of the molding mold, but in the present invention, it is installed on the left and right sides to increase the vibration efficiency of the molding mold. By vibrating the upper and middle parts of the molding mold at the same time by vibrators provided on the left and right sides, even degassing is performed throughout the mixture. In addition, it is preferable to install a pad for vibration blocking at the bottom of the molding mold so that the vibration force is maintained only in the molding mold. As the pad for vibration blocking, a material such as rubber or urethane resin or a spring can be used.

The amorphous refractory composition 9 was charged into a molding mold, covered with a lid 11 of the degassing apparatus 1, and then degassed using a vacuum pump 13 installed in the degassing apparatus 1 in the process of degassing. Pressure is reduced to 0.4 to 0.7 atm and the vibrator is vibrated for 1 to 5 minutes at a frequency of 300 to 1000 times / min. If the pressure is reduced to less than 0.4 atm or maintained at a frequency higher than 1000 times / min, the moisture or seconds Since fine powder is lost, workability is lowered and a compact structure cannot be obtained. In addition, if the pressure is reduced to more than 0.7 atm or the frequency is maintained at less than 300 times / min, sufficient degassing may not be achieved to obtain a compact structure. If the treatment time is less than 1 minute, sufficient degassing and vibration are not achieved to obtain a compact structure. If the treatment time is longer than 5 minutes, the density of the structure does not increase anymore, which is not preferable.

The following presents a preferred embodiment to aid the understanding of the present invention. However, the following examples are provided only to more easily understand the present invention, and the present invention is not limited to the following examples.

Examples and Comparative Examples

The amorphous refractory composition was prepared by adding a silicone resin as an additive for defoaming and defoaming in an amount including the amorphous refractory and water consisting of alumina aggregate, alumina cement, and ultra fine alumina in the amounts shown in Table 1 below. The molding mold 5 was installed in the degassing apparatus 1 shown in FIG. 1, and the vibrator 7 was installed at the left and right sides thereof. After charging the amorphous refractory composition 9 to the molding mold 5 and covering the cover 11 of the degassing apparatus 1, degassing and vibration treatment under the conditions shown in Table 1, and the resulting structure was dried for 24 hours at 110 ℃ After the specimens were cut from the upper, middle and lower portions of the structure, the porosity was measured, and then the average value was obtained. Table 1 shows the manufacturing conditions and test results of the castable block.

Manufacturing condition and test result of castable block Oscillator Mounting Part Vibration time (minutes) Frequency (times / min) Decompression degree (atmospheric pressure) Addition amount of the additive (% by weight) Porosity (%) Comparative example One Left and right 0.2 1000 0.4 0.1 8.5 2 Left and right 10 1000 0.4 0.1 5.0 3 Left and right One 100 0.4 0.1 10.2 4 Left and right One 3000 0.4 0.1 12.7 5 Left and right One 1000 0.2 0.1 12.1 6 Left and right One 1000 0.9 0.1 14.4 7 Left and right One 1000 0.4 0.01 13.2 8 Left and right One 1000 0.4 0.8 12.5 10 Bottom One 1000 0.4 0.1 6.8 Example One Left and right 1.5 800 0.4 0.1 4.8 2 Left and right One 1000 0.4 0.1 4.9

As shown in Table 1, in the case of Comparative Examples 1 to 10 manufactured under conditions outside the scope of the present invention, it can be seen that the porosity of the manufactured product is high. On the other hand, it can be seen that in the case of Examples 1 and 2 manufactured under the condition range of the present invention, a dense castable block is obtained.

In the case of the present invention, the degassing and vibration treatment in the mixing tank is not required in the preparation of the amorphous fire resistant composition, so that the degassing apparatus can be miniaturized. Achievements allow compact castable blocks to be manufactured at lower cost.

Claims (3)

Preparing an amorphous refractory composition, and Degassing and molding the amorphous refractory composition into a molding mold having vibrators installed on left and right sides thereof Including, The step of preparing the amorphous refractory composition comprises one or two or more additives for defoaming and defoaming selected from the group consisting of silicone resins, silicone oils, polyethylene glycols, polypropylene glycols, esteramides, amides of higher fatty acids and lower alcohols. Comprising the step of adding Method of manufacturing a castable block. The method of claim 1, wherein the defoaming and defoaming additives are added in an amount of 0.05 to 0.6 wt%. The method of claim 1, wherein the degassing process is carried out at a pressure of 0.4 to 0.7 atm, and the vibrator vibrates for 1 to 5 minutes at a frequency of 300 to 1000 times / minute.

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