JPH071436A - Method for making pottery stone type porcelain clay - Google Patents

Abstract

PURPOSE:To give plasticity without incorporating high-viscous clay and to improve moldability by using kaolin, etc., 89 clay required in making porcelain clay by pulverizing pottery stone, mixing the clay with the pottery stone, and pulverizing the mixture applying impact energy directly to the clay crystals. CONSTITUTION:Kaolin, sericite, etc., can be used as clay to be mixed with pottery stone. In making porcelain clay, a mixture of the pottery stone and kaolin is pulverized using mainly a dry ball mill. Kaolin, which can not be pulverized alone by the dry ball mill, can be pulverized by this method. In this way, since the pottery stone and the clay are mixed and pulverized in a dry state, the mixing precision is improved and the quality is stabilized. There is no need for incorporating high-viscous clay; high quality porcelain clay with high whiteness can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for enhancing the plasticity and improving the formability of porcelain clay used in the porcelain industry.

[0002]

2. Description of the Related Art Wet ball mills, dry ball mills, stampers and the like are used for crushing porcelain stones to prepare porcelain clay. When the particle size distribution and plasticity differ depending on the pulverization method and the plasticity is insufficient, a plasticity-rich clay or an organic thickener is added to impart plasticity.

The pulverization by the wet ball mill has the highest efficiency but the least plasticity, and the dry type ball mill is located between the wet ball mill and the stamper in terms of both efficiency and plasticity. Therefore, addition of highly viscous clay is unavoidable, and the influence of undesirable impurities such as iron and titanium contained in the highly viscous clay cannot be avoided. Grinding with a stamper is the easiest to obtain plasticity, but porcelain stones, which originally have a small amount of clay minerals, do not have the required plasticity, so it is necessary to add highly viscous clay. It is also inefficient and has little economic advantage.

[0004]

As described above, in the conventional method for crushing porcelain stones, the lack of plasticity must be compensated for by high viscosity clay, and the adverse effect of impurities contained in high viscosity clay cannot be avoided. There was a problem that resulted in the deterioration of quality.

[0005] The problem to be solved in the present invention is to establish a means for preparing clay which has good plasticity and plasticity without adding high viscosity clay which lacks plasticity when preparing clay. is there.

[0006]

[Means for Solving the Problems]
A dry ball mill, stamper, or other preparation method in which porcelain stone is directly smashed and crushed. Kaolin) etc. are mixed in advance,
It is characterized by crushing at the same time as ceramic stone.

Here, kaolin minerals, sericite, etc. can be used as the clay.

[0008]

In the clay preparation method of the present invention, a dry ball mill is mainly used, porcelain stone and kaolin are blended, and they are ground simultaneously. Unlike the crushing by the wet ball mill, the crushing by the dry ball mill is such that most of the crushed porcelain stones are crushed by the impact of the balls hitting each other. At this time, the ball and the porcelain stone and kaolin hit by the ball not only generate extremely fine powder, but also absorb energy due to impact, and the crystal composition of clay changes. The crystal surface of clay is positively charged, facilitating the formation of a water film.

Clay minerals have water of crystallization due to their structure and have the property of easily absorbing moisture, and it is practically difficult to dry free water to a state close to zero. Clay, like other minerals, loses water of crystallization when it is dried at high temperatures, and may lose its original properties. Further, if insufficiently dried clay is crushed by a dry ball mill, the clay adheres to the inner surface of the mill and is not crushed. Therefore, the crushing of simple clay must be performed by a wet ball mill.

Grinding with a wet ball mill is carried out with a large amount of water (200% to 300%).
It is not hit by the balls, but is crushed by the friction caused by the friction between the balls. In this format,
The higher the slurry concentration in the mill is and the higher it is, the more the ball motion is resisted, the kinetic energy is decreased, and the particles are less likely to be generated. Since the collision energy is absorbed by water, converted into heat and released, the impact on clay crystals is much smaller than that of a dry ball mill.

In the present invention, clay, which has coarse clay particles and low viscosity, is made to be crushable even with a water content which cannot be crushed by a single clay to generate fine particles, and the clay particles collide with balls. By imparting energy and increasing the ability of clay particles to form a water film, plasticity is improved.

[0012]

[Example] Hokai shell stone (made in Sanqing, Gyeongsangnam-do, Korea, cannot be molded by itself with few clay minerals) is crushed to 6 to 3 mm,
After being sufficiently dried, Korean kaolin PA dried to a water content of 10% or less was mixed in a ratio of 9: 1 and pulverized with a 500 kiloball mill for 12 hours. This crushed product was dissolved in water, strained with a 200-mesh sieve, and dehydrated with a filter press to obtain clay. This clay showed the same particle size distribution as that of the clay obtained by the stamper crushing, which was the most easily plasticizable, and the plasticity was high, and the moldability was better than the clay obtained by the stamper crush.

The above Hokai shell stone was crushed for 12 hours by a formula ball mill, and the same crushed Korean kaolin by a wet ball mill was mixed in a ratio of 9 to 1 to make clay, but it was impossible to form it.

INDUSTRIAL APPLICABILITY In the preparation of the clay according to the present invention, the kaolin mineral which cannot be crushed by the dry mill ball mill can be crushed by the dry ball mill, so that the following effects can be obtained.

1. Porcelain stone and clay Dried, blended and crushed, so that the precision of blending is improved and the quality is stable. 2. It is not necessary to dry clay to the limit. 3, high whiteness without the need to add highly viscous clay,
High quality clay can be produced at low cost. 4, low-grade porcelain stones, which were previously restricted in use,
You can utilize cheap and abundant resources such as kaolin, which lacks plasticity. 5, The production environment is safe with little dust and noise. 6. It can be applied regardless of the size of the rule, and the automation of the device is easy.

Claims (1)

[Claims] 1. A clay which is deficient in the method of preparing clay by crushing rocks, silica stones, feldspars (called porcelain stones) containing clay minerals by externally applying energy such as striking or rubbing. Is mixed with porcelain stones and pulverized to impart plasticity by directly applying energy to clay crystals,
A method characterized by improving moldability.