JPS5812219B2 - Manufacturing method for fired lightweight building materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the manufacturing method of construction materials, particularly lightweight boats and panels, which are highly water-resistant, weather-resistant, lightweight, and have a large heat-insulating effect, by effectively utilizing granulated blast furnace nullag. It is.

In recent years, the development of prefabricated houses using new construction methods has been remarkable, and as a result, there has been a demand for roof tiles and exterior materials that are lightweight, have excellent water resistance, weather resistance, and heat insulation, and have high design value. However, a material with such properties has not yet been developed.

For example, the demand for hydrothermally synthesized calcium silicate materials or setzukou-based building materials has increased significantly in recent years as new inorganic building materials, but each has weaknesses in terms of fire resistance and water resistance.
Therefore, there are also drawbacks such as the inability to apply glaze.

In order to improve these drawbacks and effectively utilize the granulated blast furnace nlug, unused resources such as waste sand rich in silicic acid are blended with the granulated blast furnace nlug, and Si02. Mixtures containing CaO of 60 to 90% by weight and 4 to 25% by weight were prepared, and if necessary, a binder (water guaranu) or a suitable foaming aid was added, and the mixtures were preformed in the cold (room temperature). After, 900-1
Heating at a temperature of 200℃, the heated material is heated to a temperature of 800 to 110℃.
Compression molding is performed while maintaining the temperature at 0°C, and the compression molded product is further glazed at a temperature of 700 to 600°C, and then glazed at 800°C.
There is a method of manufacturing glazed roof tiles by glazing at a temperature of about 1000°C to 1000°C.

(Japanese Unexamined Patent Publication No. 54-65716) Although this method compensates for the weaknesses of conventional calcium silicate hydrothermally synthesized materials or settsuko-based building materials, and enables glazing treatment, it is The process is complicated in that raw material powder such as acid-containing material is once preformed in the cold.

Moreover, in compression molding at 800 to 1100 DEG C., a batch type method is used in which each mold is processed one by one, which has the drawback of not increasing productivity.

This is not a very desirable process, especially when manufacturing flat, uniformly shaped items such as fireproof boats.

The present invention has been made in order to eliminate these disadvantages, and it improves the conventional manufacturing process, simplifies the process by omitting cold preforming, and at the same time improves productivity. The purpose is to provide a manufacturing method that is intended to improve the quality of the product.

In other words, the gist is that a powder raw material made by blending silicic acid-containing substances and foaming aids with granulated blast furnace nlug is filled into a mold, heated and fired at 900 to 1200°C in a heating furnace to foam, and then
The upper surface of the foam is continuously molded at an ambient temperature of 800 to 1100°C.

The present invention involves crushing a compound consisting of granulated blast furnace nlag, a silicic acid-containing material, and other foaming aids in advance using a ball mill, etc., and directly filling this raw material powder into a baking mold without preforming it in advance. It is something.

This firing shape extends into the heating furnace, has a certain length, and can be moved continuously through the heating furnace.

Of course, the mold for firing may have a length that is continuous with the extended length of the heating furnace.

The material of the Q-shape for firing must be silicon carbide, ceramic such as cordeurite, or heat-resistant steel such as SUS310.

The dry powder raw materials filled into the baking mold in this manner are sequentially charged into a heating furnace and heated and fired, softened and fused at a temperature of 900 to 1200° C. to be unified, and further foamed and expanded.

The upper surface of the foamed baked product is rolled with a roll to crush the expanded portion and to form a uniform surface while allowing a portion to flow.

According to experiments by the present inventors, the roll rolling force is 0.2 to 3k.
It was found that a very dense surface could be obtained by adjusting the amount to 1 g/cm2.

That is, if the rolling force is too strong, many of the cells in the foamed molded product will be compressively deformed, causing distortion or being likely to be destroyed.

On the other hand, if the rolling force is too weak, it will be difficult to obtain the desired shape.

The foamed fired product thus continuously subjected to roll reduction is then subjected to hot glazing or glaze firing, or is directly cooled and subjected to the next process.

As described above, since the present invention performs rolling forming using only a hot process, it has the effect of simplifying the process compared to the conventional manufacturing of clay glazed tiles and panels, and has extremely high productivity.

Examples of the present invention will be described below.

Example Blast furnace granulated nurag 27 parts, fine sand pulverized material 55 grains 2 ranu waste 17.8%, sico. After thoroughly mixing the 2% blend in a pole mill, it is dehydrated and dried, and the powder is filled into a silicon carbide baking mold (1200L x 300w x 35mmH).

This mold was introduced into the heating furnace shown in the figure, and sequentially carried into the heating zone 2 having a temperature of 50° C. to raise the temperature, and maintained at a temperature of 1150° C. for 20 minutes.

Next, this mold was transferred to a molding chamber 3 kept at a temperature of 850°C, and the upper surface of the fired product was continuously rolled to a temperature of 0. 5 k9/cm2
It was rolled with a rolling force of .

The performance of the material thus obtained was as follows.

Bulk specific gravity 1.3 Bending strength 270kg/cm
2 Water absorption coefficient 0.3 Thermal conductivity 0.25kcal/
mhrc sound absorption coefficient 12-30 [125-4000Hz]
This performance was fully satisfactory as an interior/exterior wall material and a soundproof wall.

[Brief explanation of drawings]

The figure shows an example of a specific apparatus for carrying out the method of the present invention. 1... Heating furnace, 2... Heating zone, 3... Roll forming chamber, 4
……roll.

Claims (1)

[Claims] 1 Fill a mold with powdered raw material prepared by blending silicic acid-containing material and foaming aid with granulated blast furnace nlug, and heat in a heating furnace at 900°~
After heating and firing at 1200℃ and foaming, 800℃~1
1. A method for manufacturing a fired lightweight building material, characterized by continuously molding the upper surface of a foam at an ambient temperature of 100°C.