JPH0660048B2 - Method for manufacturing ceramics using silicon sludge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramics manufacturing method, and more particularly to a material mixing method at the time of molding, with an object of effectively utilizing silicon sludge discharged by cutting or polishing a semiconductor silicon substrate. To do.

[0002]

[Prior Art] In addition to a clay prepared by crushing porcelain stones, clay or feldspar is further added to the clay obtained by crushing and mixing the porcelain stones, or clay and feldspar are added to silica stones to carry out the blending. It was a method of performing sludge casting or molding with a potter's wheel and then firing.

[0003]

In recent years, the environmental problems of the earth have been greatly highlighted, and the mud-like silicon produced by cutting or polishing semiconductor silicon substrates has a small particle size, and soil contamination is a concern if it is simply filled up. Therefore, there is a problem that it must be reused and disposed of effectively.

Therefore, in the present invention, the mud-like silicon produced by cutting or polishing the semiconductor silicon substrate is very similar to silica which is the main component of the ceramics, and the metallic silicon of the silicon is the same as that of the ceramics. Focusing on the fact that silica (silica stone), which is the main component, was carbon-reduced, it was an attempt to manufacture ceramics using silicon as a raw material.

[0005]

According to the present invention, ordinary ceramic raw material is mixed with mud-like silicon produced by cutting or polishing in the manufacture of a silicon substrate, and the mixture is molded and fired.

The mud-like silicon compounded according to the present invention is generated by cutting or polishing in the production of a silicon substrate, but since it generally has a high water content, it is dehydrated to have an appropriate water content when used as a raw material for ceramics. Needless to say, it has been processed.

[0007]

EXAMPLES Examples of the present invention will be described below.

[0008]

[Example 1] 120 g of kneaded clay obtained by crushing and mixing porcelain stones was mixed with 80 g of mud-like silicon produced in the production of a silicon substrate, and 0.2 cc of a peptizer such as water glass and 200 cc of water were added to make a sludge, After pouring into a plaster mold, draining mud and demolding. After demolding, the product was dried for 1 day, glazed, and fired in an oxidizing atmosphere at 1300 ° C. to obtain a porcelain ware with a grayish brown color. The physical properties of this ceramic are 0.5% water absorption and 1.1 porosity.
%, And the specific gravity was 2.3, which was equivalent to ordinary ceramics.

[0009]

Example 2 120 g of kneaded clay obtained by crushing and mixing porcelain stones was mixed with 80 g of mud-like silicon produced in the production of a silicon substrate, and 0.2 cc of water glass and 200 cc of water were further added to make sludge.
Pour into a prescribed plaster mold, then demold and mold. After demolding 1
It was dried for a day, glazed, and fired in a reducing atmosphere at 1300 ° C. to obtain a porcelain with a brown color. The physical properties of this ceramics were 0.1% of water absorption, 0.4% of porosity and 2.3 of specific gravity, which were equivalent to those of ordinary ceramics.

[0010]

Example 3 100 g of kneaded clay obtained by crushing and mixing porcelain stones was pre-baked with 100 g of mud-like silicon produced in the production of a silicon substrate,
The lumpy silica thus produced is crushed and mixed, and 0.2 cc of water glass and 200 cc of water are added to the crushed silica to form a slurry, which is compounded, molded, dried, glazed, in the same manner as in Example 1 or Example 2.
It was fired in an oxidizing or reducing atmosphere to obtain a porcelain with a grayish white color. The physical properties of this ceramic are 0.2% water absorption,
A porosity of 0.5% and a specific gravity of 2.3 were obtained, which were equivalent to those of ordinary ceramics.

[0011] As a usual ceramic raw material, in addition to the kneaded clay obtained by crushing and mixing the above-mentioned porcelain stones, clay and feldspar added to the kneaded clay obtained by crushing and mixing this porcelain stone, or clay added to clay. Various raw materials such as feldspar added can be blended.
As for the molding method, various molding methods such as molding with a lathe can be carried out in addition to the sludge casting in the embodiment.
Further, the compounding ratio of the usual ceramic raw material and the muddy silicon can be freely changed within the range of 90:10 to 50:50.

[0012]

INDUSTRIAL APPLICABILITY As described above, the present invention effectively uses mud-like silicon produced during the etching treatment caused by cutting or polishing in manufacturing a semiconductor silicon substrate in the production of ceramics, and avoids environmental problems. It eliminates the need to treat sludge that cannot pass through, can prevent soil pollution and odor problems, and the pottery produced by this method can be used in various fields of life like ordinary pottery. I have.

Claims (1)

[Claims] 1. A method for manufacturing a ceramics in which a kneaded clay obtained by crushing and mixing porcelain stone and various kinds of raw materials are mixed and molded, and pure mud-like silicon discharged by cutting or polishing a semiconductor silicon substrate is mixed. A method for manufacturing ceramics using silicon sludge, which comprises: