JPS58120573A - Amorphous refractory - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a monolithic refractory which is a commonly used monolithic large refractory for pouring, to which is added super-hardened metal aluminum which has been surface treated to make it easily dispersible.

Conventionally, the main type of monolithic refractory for pouring has been hydraulic caster pull using alumina cement as a binder, but this type of hydraulic castable refractory has alumina cement added to it by weight of 10% or more. ℃
The hot properties in the high wet area are poor, and the
In the intermediate temperature range of 00℃, there are drawbacks such as the deterioration of strength due to dehydration, which is particularly noticeable. ◎In order to correct these drawbacks, Talaybond caster pull, which uses fireclay as a binder and has added deflocculant and flocculant, has recently been developed. It has been developed and has superior hot properties, such as refractory strength, spalling resistance, thermal R#IJ strength, and volume stability, compared to conventional hydraulic casts and tabulars. It is used as a lining material for floors, etc.

However, since this Taraybond castable has a maximum of 20% by weight of fireclay added to the fine powder part, the breathability of the constructed structure is extremely reduced, making it difficult for water vapor to escape during dry heating, and often resulting in explosive vapors. Causes polling.

Construction to prevent such explosions! After curing, removing the frame, and curing for 24 hours or more, it is necessary to dry according to a constant rising curve, which takes a long time. Furthermore, since hardening is expected to occur due to the coagulation effect of the fireclay and flocculant, the cohesive effect decreases, especially in winter, and it takes a long time to remove the frame, and the strength of the constructed structure after the frame is removed is extremely low. There were drawbacks such as.

In order to eliminate the above-mentioned drawbacks, the patent application No. 51-142
In No. 509, metal aluminum powder containing 500% by weight of particles with a particle size of 0.074 m or less was added, and Al 1-
The hydration reaction of the ram reduces moisture content due to heat generation during curing and increases air permeability due to the generation of hydrogen gas, providing a monolithic refractory that will not explode or collapse even when rapidly heated and dried after pouring. ◇ Burning The metallic aluminum powder used in the above invention has poor dispersion, and the metallic aluminum may be localized within the construction body, causing large cracks. Furthermore, the addition of the metal alum powder increased the coarse bore size of 10 to 50 P, and the air permeability increased, but on the other hand, the metal alum powder increased. = Corrosion resistance is lower than when no rum powder is added. This is probably due to the infiltration of slag etc. into this coarse lA. The present inventors conducted various studies to improve the interlayer points of the above-mentioned conventional monolithic refractories added with metal aluminum, and By reducing the particle size of the aluminum powder and subjecting the aluminum powder to an easily dispersible surface treatment, localization within the construction object is eliminated, and the pore diameter generated by the hydration reaction of the aluminum powder is reduced to around 1 to 5 particles. The inventors have completed the present invention by discovering that the permeability is almost the same as the conventional one, but the corrosion resistance is improved. That is, the present invention uses 0,00% of easily dispersible surface-treated metal aluminum powder containing 50% or more of particle size of 0.020 tll or less in a conventional pouring composition.
It is a monolithic refractory characterized by adding 1 to 0.1% of heavy cap.

The particle size of the metallic aluminum powder used in the present invention is 0.04, taking into account uniform dispersion in the construction body, pore size generated by hydration reaction, ease of surface treatment, etc.
4+ml! σ for the whole line, 50% by weight for 02011m or less
Preferably, it has a shoe rack. In addition, the metal aluminum powder of the above particle size becomes active and reacts quickly, so the particle surface is coated with stearic acid, and the surface is further treated with a surfactant to make it easily dispersible. It is in a state where it is easy to disperse.

The amount of the metal aluminum powder surface-treated as described above is 0.01 to 0.1% by weight, particularly 0.02 to 0.1% by weight.
07% by weight is preferred. If the amount is less than 0.01% by weight, the addition of metal aluminum powder will have no effect and may explode if heated and dried rapidly, and if the amount is more than 0.1% by weight, a large amount of gas will be generated and As the bulge becomes larger, more cracks occur and the strength becomes weaker.

Compared to conventional monolithic refractories added with metallic aluminum, the large, monolithic refractories of the present invention having the above-mentioned configuration have been subjected to a surface treatment that makes them easier to disperse, so aluminum is not localized and the aluminum is uniformly dispersed. be done. #! Since ultrafine metallic aluminum powder is used for No. 2, the pore diameter is around 1 to 5 μm, improving corrosion resistance. Third, the air permeability is almost the same.

Fourthly, the amount of metal alrenium powder to be added can be much smaller than in the past.

Examples of the present invention are shown below. By using 〇, it can be applied as a monolithic refractory for lining molten metal containers exposed to molten slag, molten steel, hot metal, etc.

[Brief explanation of drawings]

Figure 1 is a pore size distribution diagram without the addition of metallic aluminum after drying at 500°C, and Figure 2 is a pore size distribution diagram of conventional metallic aluminum 1
．． Figure 3 shows the pore size distribution diagram when 0.05% by weight of surface-treated metal aluminum is added. Patent applicant: Daikorozai Co., Ltd.

Claims (1)

[Claims] (11) Easily dispersible surface-treated metal aluminum powder containing 50 or more particle sizes of 0.020- or less is added to an ordinary pouring composition. Monolithic refractories.