JPH01224273A - Amorphous refractory composition - Google Patents

Abstract

PURPOSE:To increase the operability and heat insulation property by adding a specific amount of rice hulls which have been crushed into a specific particle size by a specific method, to an amorphous refractory composition. CONSTITUTION:1-100pts.wt. of rice hulls crushed by heating, compressing or grinding, into particles of less than 1mm sizes are added to and dispersed in 100pts.wt. of an amorphous refractory composition. The crushed rice hulls are not irritant to skins because they are round particles, well dispersible in the refractory composition and excellent in water retention. When the particle size of rice hulls become less than 1mm, the dispersibility becomes too good to keep the satisfactory thermal insulation. Moreover, the shape becomes flat or flake undesirably. The addition of less than 1pt.wt. of rice hull causes no satisfactory improvement in operability and thermal insulation, while exceeding 100pts.wt. induces marked deterioration in corrosion resistance to the slag.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a monolithic refractory composition with excellent heat insulation properties and construction properties.

[Prior Art] Conventionally, fibrous materials have been added to monolithic refractory compositions in order to make them lighter, more heat insulating, or to improve workability.

For example, JP-A-57-209870 discloses a fireproof coating composition comprising a water-soluble alkali silicate, a curable component, an inorganic lightweight aggregate, an inorganic fibrous material, and water. This publication exemplifies glass fibers, rock wool, asbestos, carbon fibers, quartz fibers, high silica fibers, aluminum silicate fibers, zirconia fibers, whiskers, etc. as inorganic fibrous materials.

Furthermore, Japanese Patent Application Laid-open No. 59-21582 discloses spraying of a monolithic refractory made mainly of magnesia aggregate, to which an inorganic fibrous substance and/or an organic fibrous substance, and an inorganic binder are added and blended. The construction method is disclosed. This publication describes rock wool, glass wool, mineral wool, kaolin fiber, carbon fiber, zirconia fiber, silicon carbide fiber, etc. as inorganic fibrous materials, and cellulose fibers such as pulp, paper chips, cotton waste, etc. as organic fibrous materials. Examples include synthetic fibers such as nylon, vinylon, and tetron, and man-made fibers such as acetate.

Furthermore, Japanese Patent Application Laid-Open No. 59-88377 discloses a spray material for lining coating which is made by adding and mixing a fire-resistant aggregate, a hardening agent, and fibers. This publication describes the use of organic fibers such as cotton, synthetic fibers, bulbs, paper, etc. as the fibers.

Furthermore, Japanese Patent Application Laid-Open No. 60-71577 discloses a spray material for hot repairs comprising a basic refractory material, an organic fiber, and a binder. This publication exemplifies synthetic fibers, beaten waste paper, cotton fibers, recycled fibers, cotton cotton, wool, etc. as organic fibers.

[Problems to be Solved by the Invention] As mentioned above, various types of fibers are added to amorphous refractory compositions, but the problems with these are as follows: ■ Flexible organic side inorganic When using fibers,
These fibers tend to get tangled and become lump-like, resulting in poor dispersibility. That is, the construction object does not have a uniform structure, and when spraying construction is performed, the nozzle or tank is likely to be clogged.

■Organic fibers have poor wettability with water, are easily scattered, and emit a bad odor when burned.

■! ! Machine fibers such as glass fiber and slag wool are difficult to handle as they easily pierce the skin, and asbestos is undesirable from a sanitary standpoint.Also, these inorganic fibers do not burn even when heated and do not create voids. Therefore, it is not suitable when trying to obtain heat insulation properties.

[Means for Solving the Problems] As a result of intensive research to solve the problems of conventional monolithic refractory compositions using fibers, the present inventors found that the monolithic refractory compositions were pulverized and sized using a specific method. It has been discovered that the above-mentioned problems can be solved by adding adjusted momic acid, and the present invention has been completed.

That is, the present invention provides a monolithic refractory composition characterized in that 1 to 100 parts by weight of mole shell powder pulverized to a particle size of 1 ml or less by heating, compression, and crushing is added to 100 parts by weight of the monolithic refractory composition. To provide a composition.

[Function] The monolithic refractory composition to which momic acid is added in the present invention can be any conventional monolithic refractory composition such as castable, sprayed material, press-fit material, mortar, patching phase, etc., and is not particularly limited. It's not a thing.

Traditionally, momic acid has not been used much, most of it is incinerated, and only a small amount is used as a heat insulator for molten steel. It was not used because it was irritating, the grains were too close together, making it difficult to handle, and it was bulky, making transportation expensive.

Therefore, there have been no examples of using momic acid in refractories.

The rice husk powder used in the present invention is a rice husk powder with an appropriate particle size that has been pulverized by heating, compression, and leprosy. There is no irritation, and the dispersibility in amorphous refractory compositions is also good.

The characteristics of the rice husk powder are summarized below.

■No irritation to the skin.

■It has good fluidity and does not form lumps when added to and mixed with an amorphous refractory composition (good dispersibility).

■Good water retention.

■It is hard and has a powder electrical ratio of 81. Relatively heavy for a material system.
0.35 to 0.50, and is easily mixed with the amorphous refractory composition.

(2) The composition of momic acid is about 80% organic, and the remainder is highly pure 5in2, making it easy to use as a refractory.

The particle size of the rice husk powder added to the amorphous refractory composition is preferably L1 or less, and if the particle size of the rice husk powder exceeds 1 theory,
It is not preferable because its dispersibility is not very good and sufficient heat insulation cannot be obtained, and at the same time it becomes large flakes.

The amount of the rice husk powder added is preferably 1 to 100 parts by weight per 100 parts by weight of the amorphous refractory composition.If the amount of the rice husk powder added is less than 1 part by weight, the effect of improving heat insulation, workability, etc. is not obtained, and if it exceeds 100 parts by weight, the corrosion resistance against slag of the resulting construction body will be significantly reduced, which is not preferable.

The amount of rice husk powder added can be varied within the above range depending on the purpose of use of the amorphous fire-resistant composition; if corrosion resistance is important, the amount added should be reduced, and insulation properties are required. In some cases, the amount added can be increased.

As the rice husk powder to be added to the amorphous refractory composition, for example, Sumiceruco (trade name) manufactured by Sumikin Bussan Co., Ltd. can be used.

[Example] The monolithic refractory composition of the present invention will be further explained by giving examples below.

Circle m MgO-based spray materials (invention products I to ■ and comparative products 1 to ■) having the compounding ratios listed in Table 1 are sprayed onto the furnace wall at a temperature of 250°C and under the following conditions as spray materials for tundish. Constructed.

Spraying distance 20cm Material discharge rate 30ky/min Added water content: 11-16% The properties of the monolithic refractory composition are also listed in Table 1.

As is clear from Table 1 above, the product of the present invention has a
Adhesion was good even to the furnace wall at 30°C, and no blisters were observed. In addition, the powder of the present invention had good fluidity, and no nozzle clogging was observed.

Furthermore, after the spraying work, workers entered the furnace to set the weir, but no collapse was observed at this time either.

and 111 Adding 20 to 40% water to insulating castables having the compounding ratio shown in Table 2 (invention products V to ■ and comparative product ■),
After mixing with a concrete mixer, pouring was performed using a rod-shaped vibrator.

The obtained results are also listed in Table 2.

[Effects of the Invention] The monolithic refractory composition of the present invention can improve workability, heat insulation properties, and fluidity compared to conventional monolithic refractory compositions.

In addition, since the rice husk powder has good dispersibility in the monolithic refractory composition, the following advantages can be obtained: (1) During the production of the monolithic refractory composition of the present invention, crosstalk time is shortened and efficiency is improved.

■When used as a spray material, there will be no nozzle clogging or clogging near the tank outlet, as seen with conventional fiber-containing spray materials.

■There will be no unevenness in the resulting construction body, and a uniform structure will be obtained in terms of heat insulation, corrosion resistance, etc. in all parts.

Furthermore, the following advantages can be obtained by adding rice husk powder to the monolithic refractory composition: (1) The fluidity of the powder of the monolithic refractory composition is improved.

■Rice husk powder is hard, so it provides strength to the constructed structure.

Patent applicant Shinagawa White Brick Co., Ltd.

Claims (1)

[Claims] 100 parts by weight of the monolithic refractory composition is heated, compressed,
An amorphous refractory composition characterized in that 1 to 100 parts by weight of mole shell powder pulverized to a particle size of 1 mm or less by a crushing method is added.