RU2254308C1 - Raw mix for manufacture of wall ceramics - Google Patents

Abstract

FIELD: ceramics.

SUBSTANCE: raw mix contains 50.69-51.4% of flue ash from brown coal combustion, 41.17-42.06% of microsilica from crystalline silicon production, and 6.54-7.84% of electrofilter dust from aluminum production.

EFFECT: increased frost resistance and reduced average density and firing temperature.

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Description

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

The closest to the proposed raw material mixture in technical essence and the achieved effect is a raw material mixture, including 24.4-32 wt.% Fly ash from burning brown coal, 48-56.9 wt.% Silica fume and 18.7-20% wt. % emulsion of tall pitch [RF Patent No. 2191168, C 04 B 35/16].

The disadvantage of this mixture is the increased average density and relatively low frost resistance of products.

The technical result is an increase in frost resistance and a decrease in the average density of the material while lowering the firing temperature.

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

silica fume 50.69-51.4 fly ash 41.17-42.06

dust of electrostatic precipitators

aluminum production 6.54-7.84

The advantages of the proposed mixture are achieved by the inclusion of dust from electrostatic precipitators, the main production of aluminum (PEF), which has an organomineral composition. The presence of an organic component in the PEF causes a relatively low average density of the calcined products, and the mineralizing part of the additive contributes to the formation of the strength of the frost-resistant shard. In total, the introduction of organomineral additives can increase the frost resistance and the coefficient of structural quality of the material while lowering the firing temperature.

The chemical composition of silica fume produced by crystalline silicon of the Bratsk Aluminum Plant and high-calcium fly ash from the burning of brown coals of the Kansk-Achinsk basin are presented in RF patent No. 2191168, С 04 В 35/16.

PEF is a large-capacity dispersed waste of the main aluminum production with an average particle size of 5-8 μm and a bulk density of 0.84-0.92 g / cm ³ . The chemical composition of PEF includes, wt.%: F 16; Al 12; Na 9.9; Ca 0.46; Mg 0.1; SiO ₂ 0.65; Fe ₂ O ₃ 2.87.

Loss on ignition waste - up to 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 composition of the additive. The latter provides a complex effect on the phase and structure formation of the material during heat treatment while reducing the final firing temperature.

Example.

To prepare the raw mix, silica fume is used to produce crystalline silicon, fly ash from burning brown coal and dust from electrostatic precipitators of the main aluminum production.

The components are mixed in a dry state, after which the mixture is moistened to a moisture content of 16 wt.%. Samples are molded from the resulting mixture at a specific pressing pressure of 20 MPa. The molded raw is dried at 100-110 ° C to constant weight and calcined at 925 ° C.

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

Table 1 Components The content of ingredients in the composition (wt.%) 1 2 3 Silica fume production of crystalline silicon 51.40 51.04 50.69 Fly ash from burning brown coal 42.06 41.76 41.47 Dust of electrostatic precipitators of the main production of aluminum 6.54 7.20 7.84

table 2 Indicator Compositions Famous Composition 1 2 3 Firing temperature, ° С 925 925 925 1000 The average density, g / cm ³ 1.35 1.35 1.37 1.5-1.55 Compressive strength, MPa 41.2 42.0 43.0 33-36 Water absorption by weight, wt.% 19.7 26 28.5 21.1-23.7 Frost resistance cycles fifty fifty fifty 35 The coefficient of structural quality × 10 ^-2 , MPa / (kg / m ³ ) 3.05 3.11 3.13 2.2-2.3

Claims (1)

The raw material mixture for the production of ceramic products, including fly ash from the burning of brown coal, silica fume production of crystalline silicon and an additive, characterized in that the dust is used as an electric filter dust from aluminum production in the following ratio of components, wt.%: fly ash 41.47-42.06 silica fume 50.69-51.40 aluminum electrostatic dust 6.54-7.84