RU2617814C1 - Method of producing ceramic slurry - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: process for preparing a ceramic slip includes wet milling in a ball mill of clay materials, emaciated components and with the introduction of fluxing complex additive containing sodium tripolyphosphate, sodium hydroxide and superplasticizer based on phloroglucinol and furfural (SB-FF). The prepared ceramic slip is irradiated with an argon plasma at a current of 500 A and an argon flow of 1.30 m³/hour.

EFFECT: obtaining a ceramic slurry with less humidity while maintaining its mobility, which gives a product with greater strength and density.

1 ex, 3 tbl

Description

The invention relates to the field of preparation of ceramic slurry used in the manufacture of ceramic products by slip casting.

The prior art methods for producing ceramic slurry.

The disadvantages of these methods is the lack of mobility of the ceramic slurry with a decrease in humidity and, as a result, the insufficient strength of ceramic products and the low quality of the finished product.

Closest to the proposed method in terms of technical nature and the achieved result is a method for producing a slip for casting ceramic products (RF Patent No. 2465244), which includes wet grinding in a ball mill of clay materials, exhaust components and fluxes with the introduction of a complex additive containing sodium tripolyphosphate, sodium hydroxide and superplasticizer based on phloroglucin and furfural (SB-FF).

The disadvantage of this method is the lack of mobility of the ceramic slurry with a decrease in humidity and, as a consequence, the insufficient strength of ceramic products.

The problem to which the invention is directed, is to increase the strength of ceramic products.

The technical result of the invention is to obtain a ceramic slurry with less moisture while maintaining its mobility.

The technical result is achieved by the fact that the proposed method for producing a ceramic slurry, including wet grinding of clay materials, thinning components and fluxes in a ball mill with the introduction of a complex additive containing sodium tripolyphosphate, sodium hydroxide and superplasticizer based on phloroglucin and furfural (SB-FF) in addition, the ceramic slip is irradiated with argon plasma at a current strength of 500 A and an argon flow rate of 1.30 m ³ / h.

The proposed method differs from the prototype in that the ceramic slip is irradiated with argon plasma, activating the particles of the slip, which increases its mobility with a decrease in humidity.

Example

For experimental verification, a ceramic slip was prepared, which is used for the production of sanitary-ceramic products. Its components are: clay materials 53 wt. %; exhaust components 32 wt. %; meadows 15 wt. % A complex additive containing 0.016 wt. % SB-FF, 0.024 wt. % sodium hydroxide and 0.06 wt. % sodium tripolyphosphate. Then the slurry was prepared by wet grinding in a ball mill. The prepared slurry was passed through a pipeline made of a quartz tube with a diameter of 15 mm and trained in argon plasma. For irradiation with argon plasma, an UPU-8M electric arc plasmatron with a GN-5p plasma torch installed at a distance of 350 mm from a quartz pipeline through which a ceramic slurry entered the container for the finished material was used. Argon was used as the plasma gas. When passing through a quartz pipeline, the slip was irradiated with argon plasma. The optimal parameters of irradiation with argon plasma are presented in table 1.

As can be seen from table 1, the slurry subjected to irradiation with an argon plasma torch, in comparison with the prototype slurry, has greater mobility, which reduces its moisture content while maintaining the rheological parameters.

After irradiation with argon plasma of a ceramic slurry, its mobility (humidity Wshl = 32%) was studied, which was estimated by the time of expiration of 100 ml of the slip after keeping it at rest for 30 s (first fluidity) and for 30 minutes (second fluidity). The thixotropy coefficient (K) was also determined. After that, prototypes were cast from the slip and fired at a maximum firing temperature of 1200 ° C. The rheological parameters of the ceramic slip are presented in table 2. Physico-chemical properties of the products after firing are shown in table 3.

In the course of research it was found that irradiation with argon plasma of a ceramic slip allows to reduce its moisture content from 32 to 27%. At the same time, the rate of weight gain in gypsum forms increases during casting of products to 13 g / cm ² * min, which positively affects the quality indicators of finished products.

The increase in the density of samples obtained from the proposed slip irradiated with argon plasma, compared with the slip prototype (table 3) is due to a denser packing of particles, which is the result of an increase in the content of the dispersed phase in the slip and favorably affects the sintering process, resulting in a decrease in porosity and the strength of finished products increases, which significantly reduces product rejection at all stages of the technological process.

From the above example it is seen that the inventive method allows to obtain a ceramic slurry with lower humidity while maintaining its mobility and increasing the strength of ceramic products and, as a result, improving the quality of the finished product. Thus, the claimed technical result is achieved.

Claims (1)

A method of producing a ceramic slip, which includes wet grinding in a ball mill of clay materials, thinning components and fluxes with the introduction of a complex additive containing sodium tripolyphosphate, sodium hydroxide and superplasticizer based on phloroglucin and furfural (SB-FF), characterized in that the ceramic slip irradiated with argon plasma at a current strength of 500 A and an argon flow rate of 1.30 m ³ / h.