JPS6256350A - Porcelain raw material composition - 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 [Industrial Application Field] The present invention relates to a ceramic raw material composition using foundry dust, which is industrial waste.

[Conventional technology]

Roof tiles, ceramic pipes, etc. used in Japanese houses are manufactured using special clay produced in each region, but in recent years clay has become increasingly depleted in various regions, leading to the problem of destruction of the natural environment. Therefore, it is becoming difficult to secure the required amount of raw clay. Therefore, for example, clay is obtained by digging up rice fields, but this increases the cost of excavation and also increases the drying cost because the water content ratio D4 of the excavated clay is adjusted. Moreover, since such clay is of inferior quality, it has a high shrinkage rate during the process from molding to drying to firing, leading to a high rate of product failure.

On the other hand, foundry dust, which is an industrial waste, has to be disposed of in landfills at great expense in order to prevent pollution caused by its disposal, resulting in huge losses. f)
), and their effective use is desired. Conventionally, an example of using industrial waste for clay products is JP-A-57-20536.
No. 0 I here discloses the addition of fly ash from a coal-fired power plant, but the fly ash 1 unit 51
The content of 02 has decreased by 1 to 39-51%, and on the other hand, 5u
Since it contains 6 to 14% of negative (+) Fe203 and is not of good quality, it is unsuitable for use in high-strength products.

[Problem that the invention seeks to solve]

The present invention is intended to solve the problem described in 111, and aims to reuse what has traditionally been disposed of as industrial waste as a source, thereby reducing cost losses due to disposal and extending the life of natural resources. ):! : By measuring and blending the waste with natural clay in an appropriate amount, a product with higher strength than conventional products made only of natural clay can be obtained. The purpose is to provide a raw material composition.

[Means to solve the problem]

The inventor of the present invention is working on the casting cyclone etc. of the casting sand apricot production device! I
! The foundry dust that is collected contains Si, which is necessary for 1F as a dead wood component.
Since it contains 70% by mass or more of n, and natural viscosity has a particle size distribution that allows it to be mixed with natural viscosity, when the above foundry dust collection dust is mixed with natural viscosity, it becomes viscous. +- Thinking that it would be possible to completely improve product purchasing and also solve the problem of depletion of clay raw materials, we mixed casting dust containing 5iOz as the main component with clay at a certain ratio and formed it into ceramic pipes. When fired, the water absorption rate was 8, which was good in terms of 1 bending and breaking load.
! l! The present invention was completed after discovering that a product could be obtained.

That is, the pottery raw material composition of the present invention is characterized in that the raw material clay is mixed with 30% or less of foundry dust collection dust based on the total city ratio.

[For production]

In general, the ratio of clay r1 weight as a raw material for ceramics is 60 to 70
% SiO,, ts~5Ω% Al2O, and 1~5
% F et Os and has an average particle size of about 2 to 10 mμ. On the other hand, casting dust collection task is 70%
Contains the above 5ide and 10% or less of A et al.
Since it has a particle size of 0 to 130 μm, when mixed in an appropriate amount with viscosity and L, a composition with a high 5 ift content can be obtained, which reduces the yield during drying and firing and also reduces the particle size of foundry dust. Since the particle size is larger than that of clay, it acts as an aggregate and improves the strength of the product.

However, as the mixing ratio increases, the porosity in the molded product increases, the 1 bending strength reaches its maximum value, and the water absorption rate increases unilaterally. If it is usable in terms of quality even if about 20% of the casting dust is collected after one run, it will be 10 to 15.
%, the best quality product can be obtained regardless of the composition of the dust.

Note that when the amount of metallic iron in the foundry dust increases, Fe and 0. is produced and black spots appear on the surface of the fired product, making it undesirable as a raw material for products that require external purity. Furthermore, if the carbon content increases, there will be areas where it does not mix uniformly with the clay, resulting in "Fukun9" and partial peeling, resulting in a large number of defective products.

〔Example〕

Examples in which the composition of the present invention was used to manufacture ceramic tubes will be described below. However, the composition of the clay used as the raw material is as follows, and the components of the foundry dust collection task added thereto are also shown in weight percent.

Component Weight % 5iO166 AltOs 20 Fe, O,' Alkali content 4 (CaO, M2O, 1 (sO, Na, O) Loss on ignition
6 Example 1 Si'0276%, AJ, 0.9%, Fe2O, 4%
, 5% alkali content, 6% loss on ignition.41,45
Approximately 90% of the particles are from 130 μm to 130 μm in diameter, and the mixture is mixed at the ratio shown in Table 1, kneaded in a mixer, formed into a ceramic tube, and then fired at a temperature of 1100°C for 56 hours, followed by the above firing. The bending strength and water absorption rate of the product were determined by 6111 and are shown in Table 1.

Table 1 In the case of this example, the 1IIj strength CC is the same as the conventional product even if 20% of casting dust is mixed, but it is 15 to 16% due to the restriction of JIS standard (10%) for water absorption. Preferably up to a certain extent.

Example 2 3jQ, 91%, Al, Q, a%, Fezes 2
%, alkaline content 2.5%, loss on ignition 0.5%.

Ceramic tubes were produced by zeta filtration in the same manner as in Example 1, except that foundry dust containing about 90% particles of 45 to 130 μm was used, and the bending strength and water absorption heavy metal 6111 were determined. The results are shown in Table 2.

In the case of this example in Table 2, even if the mixing ratio is 20%, the water absorption rate is 10% or less, and the 1 bending strength is somewhat inferior to the conventional product, but it can be practically used.

The following figure is a graph of the relationship between the mixing ratio of separately collected dust and the 1llr strength.
Since the sum of the contents of O, and Fetus is higher than that of the foundry dust used in Example 1, the sintering property of the transparent material is improved, and as a result, the bending strength decreases when the mixing ratio is high. It can be said that the rate of contamination is gradual, and the range of contamination ratio is widened accordingly.

〔Effect of the invention〕

As mentioned above, this invention is an industrial corpse! By effectively using foundry dust that was previously disposed of as a material, it is possible to prevent the depletion of natural clay and also improve the quality and performance of ceramic products.

[Brief explanation of the drawing]

The figure shows a graph showing the relationship between the mixing ratio of casting dust and the surface strength of ceramic pipes. Patent applicant Toyota Motor Corporation representative Patent attorney Yumi Sae (one idiot)
,-,l',-k.

Claims (1)

[Claims] A ceramic raw material composition characterized by adding and kneading foundry dust collection dust of 30% or less in total weight ratio to raw clay.