JPH0420869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing granite-like stone.

(Prior art) Natural granite is a plutonic rock among igneous rocks, and its polished surface exhibits a beautiful phenocryst pattern due to crystals of quartz, feldspar, and biotite, so it is used as a typical stone material. However, granite is dense and strong, so cutting and quarrying granite requires a great deal of labor, and processing it into stone after quarrying takes a lot of effort. Therefore, natural granite,
For example, the present applicant previously developed a method for manufacturing a stone similar to granite as a ceramic artificial stone by molding it into a desired size and shape and firing it.
As described in the publication, a molded article of a certain shape is compression-molded from a mixture of base soil for ceramics and coarse particles of biotite granite obtained by washing and sieving mined weathered granite. After firing the molded products, we developed a method to adjust the external shape by rubbing the molded products against each other.

(Problem to be solved by the invention) However, since the external shape of the granite-like stone produced by this method is prepared by a co-printing method in which the fired products are brought into contact with each other and rubbed, co-printing takes time. In addition, it is impossible to create a so-called field surface (nozura) that is split naturally, and there is little sense of the rustic atmosphere, and as hobbies become more sophisticated and sophisticated, there is a demand for artificial stones that have a rich sense of the rustic atmosphere. There is.

(Means for Solving the Problems) The present invention relates to a method for producing a granite-like stone developed in response to the above-mentioned demands, and is a method for producing a granite-like stone, which has a mixture of base soil for ceramics and coarse grains of biotite granite. The molded body formed into the desired shape is split flat so that the cut surfaces have irregular uneven surfaces, and then the cut surfaces are combined and fired, and after the kiln is taken out, the cut surfaces that have been fused by firing are separated. It is characterized by:

The coarse particles of biotite granite used together with the base soil for ceramics in the present invention are easily obtained as waste when extracting quartz, which is used as a raw material for ceramics, by washing and sieving mined weathered granite with water. However, the appropriate particle size of the coarse particles is about 0.5 to 3 mm. For such coarse grains of biotite granite, about 7 to 10% moisture is added to make it easier to mix.
In terms of weight ratio, the former is
Mix thoroughly at a ratio of 30 to 50 parts and the latter 70 to 50 parts,
If compression molding is performed using a 200 to 300 ton dry molding press using a mold of the desired shape such as a square plate, disk shape, or rectangular block shape, the base soil becomes a binding material and the biotite granite is formed. Since the molded product contains coarse grains and has low moisture content, if this molded product is left as it is or slightly dried, and split by applying impact with a splitter from all sides, the split surface will be uneven and irregular. Once the molded body has been split, the proportions are adjusted again and then packed in a kiln and fired at 1,200 to 1,400 degrees Celsius.The sintering of the base material creates a durable fired product. This fired product is a white ground formed by firing the base clay for ceramics, and coarse grains of biotite granite appear black and gray due to firing, and are dotted with speckled patterns all over the surface. In addition to exhibiting an exposed appearance, the combined cut surfaces are molded products in which coarse particles of feldspar, biotite, iron, metal oxides, etc. contained in the base material are melted and divided during sintering. Because it is welded, if you split it with a chisel or splitter after taking it out of the kiln, the fractured surface will not be directly exposed to the flame during firing, so it will look very similar to the surface of natural stone without any post-processing such as co-printing. It becomes a product with

(Example) 30 parts by weight of biotite granite with a particle size of approximately 0.5 to 3 mm,
40 parts by weight of granules dried to a moisture content of approximately 7% with a spray dryer as a base soil for ceramics, consisting of a mixture of 70% feldspar, 10% pottery stone, 5% Kibushi clay, and 15% Frogme clay (by weight), and general 30 parts by weight of magnetic raw material powder for tableware is stirred in a mixer with or without the addition of a small amount of fine powder of chromite with a particle size of about 0.1 to 2 mm, and this mixed material is molded into a 4 cm 25cm×
It was compression molded into a 4cm square plate block using a 300 ton press and dried to a moisture content of approximately 4%. This dry, low-moisture square plate block is split flat by applying impact from all four sides with a splitter so that the split surfaces become irregularly uneven surfaces that are naturally formed, and the split surfaces are brought together again and packed in a kiln. After firing at a temperature of ~1300°C, the kiln was taken out, and the mating surfaces described above were chiseled from one side to separate the fused planar surfaces. The product made in this way had a planar surface that was very similar to a natural granite surface that had been split naturally.

(Effects of the Invention) As is clear from the above explanation, the method for producing a granite-like stone of the present invention involves forming a mixture of ceramic base soil and biotite granite coarse particles into a certain shape, and forming the mixture into a certain shape. The low-moisture molded body was split into flat parts, the split surfaces were brought together again, and fired, and the flat split surfaces that were fused during firing were released, resulting in the product having a so-called open-face shape on the split surfaces, and Since this divided surface is not directly exposed to flame during firing, the divided surface does not become glossy during firing.
This invention has the advantage of producing a stone material that has the feel of naturally split natural granite, and together with the advantage of being able to be mass-produced at a low cost because it requires almost no effort and does not require any special equipment, the present invention is one of the best in the industry. There are some extremely important contributions to development.

Claims (1)

[Claims] 1. A molded body made of a mixture of ceramic base soil and coarse grains of biotite granite is molded into the desired shape, then split into flat surfaces so that the cut surfaces have irregularly uneven surfaces, and then the cut surfaces are combined and fired. A method for producing granite-like stone, which is characterized by separating the fused facets by firing after leaving the kiln.