RU2378224C1 - Raw mixture for preparing light tone engobe for wall ceramics - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: raw mixture relates to compositions for making engobed ceramics. The said technical outcome is achieved due to that, the light tone engobe raw mixture contains (in wt %): microsilica 84.4-87.8; crushed spent carbon lining of electrolysis cells in aluminium production 11.3-12.7; Tayga detergent 0.9-2.9.

EFFECT: lower air and fire shrinkage with low burning temperature and wider raw material base.

3 tbl, 1 ex

Description

The present invention relates to the production of building materials and can be used for the manufacture of engobed ceramic wall products from natural and industrial raw materials.

Closest to the proposed invention in technical essence and the achieved effect is a raw material mixture, including in wt. %: clay (77.5), sand (10) and the fight of colorless container glass (12.5) [1].

A disadvantage of the known raw material mixture is high air and fire shrinkage, increased firing temperature and the need to use scarce natural raw materials - white clay.

The technical result is a decrease in shrinkage and a decrease in firing temperature with the expansion of the raw material base.

The specified technical result is achieved by the fact that the raw mix for producing engobe contains silica fume, raw spill from crushing spent coal lining of aluminum electrolysis and Taiga detergent in the following ratio of components (wt.%):

silica fume 84.4-87.8; spill from crushing of the spent coal lining of aluminum electrolysis cells 11.3-12.7; Taiga Detergent 0.9-2.9.

Silica fume is a waste product from the production of crystalline silicon and ferroalloys from the Bratsk Ferroalloy Plant. The chemical composition of silica fume includes, by weight. %: SiO ₂ 87.75; Fe ₂ O ₃ 0.55; MgO 1.22; Na ₂ O 0.43; K ₂ O 0.37; Al ₂ O ₃ 0.85; CaO 0.42; RFP 7.22. The particle size distribution of silica fume is presented in table 1.

Table 1 Granulometric composition of silica fume Particle size, microns Less than 0.1 0.1-0.2 0.2-0.4 0.4-1.0 1,0-10 10-50 50-100 More than 100 Content by weight,% 8.5 34.0 30,0 8.0 2.5 1,0 5,0 11.0

An spill from crushing of the spent coal lining is formed after dismantling during the repair of electrolyzers and subsequent crushing of the blocks of the spent coal lining. Spent coal lining larger than 5 mm is used as a flux in iron and steel enterprises, particles up to 5 mm in size are waste and sent to the dump. The chemical composition of the spill from crushing the spent coal lining, wt. %: CaF ₂ 3.2; Na ₃ AlF ₆ 33.3; Al ₂ O ₃ 3.0; C 55.1; SiO ₂ 2.0.

Detergent "Taiga" (TU 13 - 4302007 - 032 - 92) is a by-product of JSC "Bratskkompleksholding" and contains, by weight. %: tall oil saponified fatty acids 98.6; formalin (preservative) 0.2; sodium salt of carboxymethyl cellulose or methyl cellulose (antiresorbent) 0.5; fragrance for soap and detergents 0.7.

The advantage of the proposed mixture is achieved by combining in its composition an acidic (silica fume), as well as an organo-mineral component (spill from crushing of the spent coal lining of electrolyzers), the interaction of which ensures the formation of hydroaluminates and hydrosilicates in the anobic mass and drying, and reduces the cobble-shrink. In aggregate, this ensures the formation of a light-burning, defect-free coating at a lower firing temperature.

EXAMPLE

Silica fume, fly ash from burning brown coal from the Irsha-Borodinsky deposit and dust from aluminum electrostatic precipitators are used to prepare the raw material mixture. The dry components are mixed, the resulting mixture is moistened to a moisture content of 16%. The dried semi-finished product is fired at a temperature of 925 ° C.

Examples of compositions, physico-mechanical properties of calcined engobe masses are given in table. 2 and 3.

table 2 Components The content of ingredients in the composition (wt.%) one 2 3 four 5 Silica fume 51.6 55,2 59.8 76.0 81.8 Fly ash from burning brown coal 40.5 36.8 32.1 15.0 10.0 Dust of aluminum electrostatic precipitators 7.9 8.0 8.1 9.0 8.2 Table 3 Indicator Structure Famous Composition one 2 3 four 5 Firing temperature, C 925 925 925 925 925 1000 The average density, g / cm 1.35 1.30 1.26 1.23 1.13 - Compressive strength, MPa 41.2 43.6 42.5 33.8 31.9 45 Air shrinkage,% 0.46 0.5 0.49 0.49 0.4 0.5-0.6 Fire shrinkage,% 1,6 1.7 1.8 2.1 1.8 3.2 Color Light beige Light gray White [1. p.38, composition No. 5 table 6]

Information sources

1. Komleva G.P. Volumetric staining and engobing of ceramic bricks using industrial waste. // Construction Materials. - 2007. No. 2, p. 36.

Claims (1)

The raw material mixture for producing light-colored engobe for wall ceramics, including silicate and aluminosilicate components, melt and mixing fluid, characterized in that it contains silica fume as a silicate component and alumina - a spill from crushing of spent coal lining of aluminum electrolyzers, into the quality of the mixing liquid is an aqueous solution of Taiga detergent in the following ratio of components, wt.%:
silica fume 84.4-87.8 crushing spill spent coal cell linings aluminum production 11.3-12.7 Taiga Detergent 0.9-2.9