JPS6217085A - Manufacture of stone material for ornament - 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 Industrial Application] The present invention relates to a method for manufacturing stones used mainly as interior/exterior materials and flooring materials for buildings, and in particular to methods for manufacturing stones used as interior/exterior materials and flooring materials for buildings, and in particular, to improve the content of muscovite in total mica in granite. The present invention relates to a method for manufacturing decorative stone from muscovite granite having a content of about 50% or more.

[Conventional technology and its problems]

Traditionally, natural stone has been widely used as a decorative stone material, but biotite granite is exclusively used to manufacture decorative stone building materials made from granite. It is polished and made into a product.

However, even though it is the same granite, in the case of so-called muscovite granite, which has a relatively high muscovite content, the surface pattern does not meet the customer's taste, and the weave of the base material itself is not tight. For this reason, there is very little demand for muscovite granite, and currently only biotite granite is used.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a processing method for increasing the demand for muscovite granite, which has hitherto been in extremely low demand, to the same level as biotite granite and for utilizing natural resources.

[Means for solving problems]

Granite usually has a glaze component mainly composed of feldspar,
In particular, muscovite granite has a higher content of alumina and potassium feldspar than biotite granite.

Unlike biotite granite, which is destroyed by firing, in the case of muscovite granite, this feldspar is melted.
This work was completed by focusing on the phenomenon that when heated above 00°C, the feldspar becomes glazed, a glossy pattern colored by other ingredients such as iron and muscovite appears, and the material itself also hardens. It is something.

If the baking temperature is below 1100°C, the dough will not be baked sufficiently, and if it exceeds 1300°C, a part of the dough will partially melt and sag. Therefore, the firing temperature is 11
It is desirable that the temperature be 00°C or higher, particularly within the range of 1150 to 1280°C.

The pattern that appears during the above firing varies depending on the history of the production area, but changes depending on the firing atmosphere. In a reducing atmosphere, the black pattern appears clearly, and in an oxidizing atmosphere, the muscovite becomes a reddish brown. Changes to Therefore, by changing the firing atmosphere, the color of the pattern that appears can be changed.

Hereinafter, the present invention will be specifically explained based on Examples.

[Example] Muscovite granite with a biotite content of 40% or less produced in the Amakawa/Hirano area of Sakugi-cho, Saga Prefecture, with 29 columns and widths.

Cut into a tile-like board with a thickness of 1.3 cm, and the same tile-like board 2
0 sheets are placed on a shelf board of carborundum, and the internal volume is 2.
Reduction firing and oxidation firing were performed in the gas-heated shuttle kiln No. 3, respectively. In the case of reduction firing, firing was performed at 1280° C. for 17 hours in a combustion gas atmosphere containing 3% CO. In addition, in the case of oxidation firing, it is heated at 1250℃ in an open state to the atmosphere.
It was baked for 5 hours.

In all cases, the plates after firing maintained a square shape without settling or distortion, and each dimensional error was within ±0.51.

The dough obtained through reduction firing has a slightly bluish tinge,
The surface pattern was a mixture of red, black, and white spots, whereas the fabric obtained by oxidation firing had red spots distributed throughout the white fabric, with black and white spots on top. It had a relatively flashy pattern with some parts mixed together.

When a fracture test was conducted, the fracture surface had the same pattern as the surface over the entire surface.

〔Effect of the invention〕

The method of the present invention prevents discoloration and discoloration by improving the fabric of muscovite granite, improves corrosion resistance and fire resistance, and further expands the freedom of surface coloring, making muscovite granite a high-quality stone material. This opens up new possibilities for use.

Claims (1)

[Claims] 1. After cutting the muscovite granite into a predetermined shape, heat it to 1100℃
A method for producing a decorative stone, which comprises firing the above to melt the glaze component in the muscovite granite and create a colored pattern on the surface.