RU2267471C1 - Raw mixture for production of wall ceramic articles - Google Patents

Abstract

FIELD: building industry, in particular composition useful in wall ceramic article production.

SUBSTANCE: claimed mixture contains as starting components (mass %) microsilica from crystal silicium production 51.9-52.9; fly ash from brown coal combustion 43.3-42.4; electrostatic cleaner from aluminum production 0.9-1.0, and detergent 2.9-4.7.

EFFECT: mixture of increased hardness and freeze resistance, decreased shrinkage and burning temperature.

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Description

The present invention relates to the production of wall ceramic products and can be used for building materials.

The closest to the proposed raw mix in technical essence and the achieved effect is a raw mix, including: silica fume production of crystalline silicon (48 ... 56.9 wt.%), Fly ash from burning brown coal (24.4 ... 32 wt.%) and emulsion of tall pitch (18.7 ... 20 wt.%). [RF patent No. 2191168, C 04 B 35/16].

The disadvantages of this mixture are relatively low values of strength and frost resistance and increased firing temperature.

The technical result is the involvement of technogenic raw materials in the production of building materials, increasing frost resistance and the coefficient of structural quality, lowering the firing temperature.

The technical result is achieved by the fact that the raw material mixture for the manufacture of wall ceramic products contains silica fume production of crystalline silicon, fly ash from burning brown coal, dust from electrostatic precipitators from aluminum production and Taiga detergent in the following ratio of components (in wt.%) As raw materials ):

silica fume 52.9-51.9 fly ash 43.3-42.4 dust of electrostatic precipitators aluminum production 0.9-1.0 Detergent "Taiga" 2.9-4.7

The dust of electrostatic precipitators is a large-tonnage dispersed waste from aluminum production with an average particle size of 5-8 microns and a bulk density of 0.84-0.92 g / cm ³ . The dust of electrostatic precipitators of the Bratsk aluminum smelter contains, wt.%: F - 16.0; Al - 12.0; Na - 9.9; Ca - 0.46; Mg - 0.1; Fe ₂ O ₃ - 2.87; SiO ₂ 0.65; PPP - 38%.

The technological advantage of PEF is the absence of the need for preliminary preparation (grinding), as well as the combination of mineralizing and organic components in the additive composition. The latter provides a complex effect on the phase and structure formation of the material during heat treatment while reducing the final firing temperature.

The chemical composition of silica fume production of crystalline silicon and fly ash from the combustion of brown coal is presented in the patent of the Russian Federation No. 2191168, 04 04 35/16.

Detergent "Taiga" is a jelly-like product without mechanical impurities, yellow with different shades of color, having a perfume smell characteristic of this product.

Organization-developer of normative documentation: Bratskkompleksholding OJSC.

Manufacturing organization: OJSC "Central Control Commission" Wood chemical production.

Normative and technological documentation: TU 13-4302007-032-92.

The chemical composition of the detergent (wt.%):

tall saponified fatty acids 98.6 formalin (preservative) 0.2 carboxyl methyl cellulose sodium or methyl cellulose (antiresorbent) 0.5 fragrance for soap and detergents 0.7

The use of an aqueous solution of Taiga detergent as a mixing liquid allows one to achieve a denser packing of particles in the raw material, increase the strength of the dried semi-finished product up to 24 ... 25 MPa, and also intensify redox processes during firing due to the interaction of iron oxides and products from combustion Detergent Taiga.

Example: To prepare the raw material mixture, silica fume is used to produce crystalline silicon from the Bratsk aluminum plant, fly ash from burning brown coal from the Irsha-Borodinsky deposit of the Kansk-Achinsk basin, dust from electrostatic precipitators of the Bratsk aluminum plant and Taiga detergent.

The process of preparing the mixture includes the following operations.

Dry components are thoroughly mixed, then Taiga detergent is introduced into mixing water (16% of the mass of dry dispersed components) and the mixture is moistened with the resulting aqueous solution.

Products are formed from the raw mix by the method of semi-dry pressing at a pressing pressure of 20 MPa.

Then the semi-finished product is dried at a temperature of 100-110 ° C to constant weight and calcined at a temperature of 900 ° C.

Examples of compositions, physico-mechanical properties of the calcined products are given in tables 1 and 2.

Table 1 Components The content of ingredients in the composition (wt.%) one 2 3 Silica fume production of crystalline silicon 52.9 52,4 51.9 Fly ash from burning brown coal 43.3 42.8 42,4 Dust of aluminum electrostatic precipitators 0.9 1,0 1,0 Detergent "Taiga" 2.9 3.8 4.7

table 2 indicator structure Famous Composition one 2 3 Firing temperature, ° С 900 900 900 1000 The average density, g / cm ³ 1.40 1.43 1.48 1,50-1,55 Compressive strength, MPa 37,2 37.9 38,0 33-36 Water absorption, wt.% 28.3 27.8 27.3 21.1-23.7 Frost resistance, cycles fifty fifty fifty 35 The coefficient of structural quality * 10 ^-2 , MPa / (kg / m ³ ) 2.66 2.65 2,57 2.2-2.3

Claims (1)

The raw material mixture for the manufacture of wall ceramic products, including microsilica for the production of crystalline silicon, fly ash from burning brown coal and a mixing liquid, characterized in that Taiga detergent in the form of an aqueous solution is used as a mixing liquid, the mixture additionally contains an organomineral additive in in the form of dust of electrostatic precipitators of the main aluminum production in the following ratio of components, wt.%: Silica fume 52.9-51.9 Fly ash 43.3-42.4 Dust of aluminum electrostatic precipitators 0.9-1.0 Detergent "Taiga" 2.9-4.7