JPS6172690A - Vibration molding refractories - 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 Field of the Invention The present invention relates to a refractory for vibration molding, and more particularly to a refractory for vibration molding that exhibits good workability with a small amount of water added.

Rod -> Kasa - Kai - - One - Stamp material, pouring material, etc. have conventionally been used as the lining material for blast furnace tap troughs.

Among these, the stamp material is used in the stamp construction method in which the material is hammered into a predetermined shape using a rammer, and this construction work is unfavorable in terms of the working environment because it requires long hours of work in high heat and dust.

For this reason, % stamp material amount (instead, pouring material has become a trap that can be used mainly. However, in order to improve workability, this pouring material has to be
It is necessary to add % by weight of moisture], and for this reason, the porosity is generally 15% or more after drying at 110°C;
After firing at 00°C, it is difficult to obtain a dense finished body with a low porosity of 20% or more.

Means for Solving the Problems The present inventor has conducted various research in order to obtain a refractory that has good workability with a small amount of added water and has a T&D density after drying, and has developed a refractory raw material. It was discovered that a specific H1 formulation containing potassium soda tartrate, polyalkylaryl sulfonate, and oxalic acid has good workability with a small amount of water added, and the constructed body after drying becomes dense with low porosity. The present invention has now been completed.

That is, the present invention provides: 1) Alumina aggregates 65 to 85j [
t%, silicon carbide 5 to +5ji amount%, clay 1 to 5 times%,
Alumina cement 1-5% by weight, easily sinterable alumina 5-1
100 parts by weight of a refractory raw material consisting of 10% by weight of O and 3-10% by weight of hydrophilic carbon, I) 11 Karin tartrate-JJO, 01-0.1 parts by weight, l) Polyalkylarylsulfone diluted salt 0.01-0. 1 part by weight, and IV)
Oxalic acid 0. A refractory for vibration molding consisting of OI ~ 0.1 part by weight.

The refractory raw material used in the present invention consists of alumina aggregate, silicon carbide, clay, alumina cement, easily sinterable alumina, and hydrophilic carbon.

Examples of alumina aggregates include fused alumina, sintered alumina, clay shale, and bogyu site, and the amount used is as follows:
It should be 65-85% of the refractory raw material. The alumina aggregate is used after adjusting its particle size appropriately according to a conventional method so that it can be packed tightly.

Silicon carbide is effective in increasing hot strength, and particles with a particle size of 0.31 or less can withstand 5 to 15% heavy duty in refractory raw materials. If it is less than 5% by weight, it will have little effect on increasing hot strength, and if it exceeds 15% by weight, construction workability will deteriorate and is not desirable. It has an increasing effect. There are no particular restrictions on the clay that can be used, and for example, Joshia kaolin, Motosansui 161 clay, etc. can be used. The particle size of the clay is about 51 mm or less, and it is used in an amount of 1 to 5% of the refractory raw material. If it is less than 1%, there will be no effect of increasing the strength, and if it exceeds 5f, the workability will be poor, which is not preferable.

Alumina cement is used as a binder and accounts for 1 to 5% of the refractory raw material. If the amount used is less than 1% by weight, the curing time of the construction body will be long, which will cause problems during work. If it exceeds 5% by weight, the curing time will be less than 30 minutes, which may cause curing during operation, which is not preferable.

Easily sinterable alumina starts sintering in the intermediate temperature range, and greatly contributes to increasing the strength in the high temperature range and making the constructed body denser. Easily sintered alumina has a particle size of 0.02M
5 to 10% of the refractory raw material is used in an amount of about M or less. If the amount used is outside this range, good □ construction workability cannot be obtained, which is not preferable.

Hydrophilic carbon is carbon whose surface has been treated with hydrophilic substances (3T7, etc.) such as decoction, polyvinyl alcohol, etc., and it has an effect on erosion resistance without impairing fluidity. Hydrophilic carbon Specifically, for example, powder obtained by mixing pitch and decoction aqueous solution and drying the mixture is mentioned, and the particle size is less than that of a decoy at 3 to 10% by weight in the refractory raw material. If the amount used is less than 3% by weight, there will be no effect on corrosion resistance, and if it exceeds 10% by weight, the workability during construction will be poor, which is not preferable.

In the present invention, the refractory raw material 100W having the above composition is used.
Potassium soda tartrate 0.01 to 0.0 to Cfi part.
1 part by weight, polyal+luaryl sulfonate 0.01
~'0.1 parts by weight and sil'>m 0.01~O,'
l Use parts by weight. As the polyalkylaryl sulfonate, for example, β-naphthalene sulfosic acid sorta,
A dispersant containing formalin as a main component can be used. By using the above-mentioned amounts of monolithic acid calisota, polyarylallyl sulfoshi fermentation salt, and oxalic acid, the refractory 11 [Gamotsusha's 3-5% water content was added and kneaded, resulting in a good condition. ; Indicates workability. Therefore, compared to the conventional product, which requires addition of water of 5 to S JJt amount % of the amount of refractory, the amount of added water can be reduced. The above effects can be exhibited, and if the amount used is outside the above range, the workability will deteriorate if the amount of added water is small, which is not preferable.

The refractory of the present invention is prepared by blending each component in a predetermined amount and
After adding ~5% by weight of water and kneading, it is constructed by vibrating and filling a construction frame such as a blast furnace tap trough.

Effects of the invention: 1 Since the refractory of the present invention requires less water addition S1 during construction, the heating drying time can be shorter than that of conventional products. Also b
(The porosity of i-work is 12% or less after drying at 110℃, 1
After firing at 400°C, the ratio is less than 19%, and the constructed body is dense, has high strength, and exhibits poor corrosion resistance.

Example Next, the present invention will be explained in detail with reference to Examples.

Examples 1 to 4 As shown in Table 1, after adding 4 layers of water to the refractory vIJ100 heavy bar and kneading, vibration filling was carried out and the mixture was heated to 110°C.
The mixture was dried for 10 hours and fired at 800°C or 1400°C. Various physical property tests were conducted on these refractories, and the results for Example 1 are shown in Table 3.

Comparative example! After kneading the refractories with the composition shown in Table 2, vibration filling was carried out, and after heating and drying at +10°C for 24 hours, the temperature was increased to 800°C.
Or fired at 1400°C. This refractory was tested in the same manner as in the example, and the results are shown in Table 3 (not shown).

Table 2 Table 3 *The slag test was conducted using a rotary slag tester using blast furnace slag: pig iron - ml of slag 2 & 9.
It was carried out for 5 hours at ℃. The test results were determined by measuring the sample dimensions after the test () IC and determining the amount of erosion loss (eyebrow), which was expressed as an index when the amount of erosion loss in the comparative example was set as 100.From Table 3, the actual Th1ef It is clear that refractories are dense and exhibit high strength, and from the slag test results,
It is clear that the refractory of Example 1 also has excellent corrosion resistance. Moreover, the refractories of Examples 2 to 4 also showed results equivalent to or better than the refractories of Example 1.

(that's all)

Claims (1)

[Claims] (1)i) 65-85% by weight of alumina aggregate, 5-15% by weight of silicon carbide, 1-5% by weight of clay, 1-5% by weight of alumina cement, 5-10% by weight of easily sinterable alumina, and hydrophilicity 100 parts by weight of a refractory raw material consisting of 3-10% by weight of carbon, ii) 0.01-0.1 parts by weight of potassium soda tartrate, ii)
i) Polyalkylaryl sulfonate 0.01-0.1
and (v) 0.01 to 0.1 parts by weight of oxalic acid.