RU2520321C1 - Raw mixture for production of wall ceramic items - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: raw mixture contains the following, wt %: ferroalloy production gas cleaning dust 68.0-66.7; carbonated clay loam 29.1-28.6; carbon lining crushing spill 2.9-4.7. Cold resistance comprises 75 cycles.

EFFECT: increasing cold resistance at reduction of average density and thermal conductivity.

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Description

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

Closest to the proposed invention in technical essence and the achieved effect is a raw material mixture, including in wt.%: Fly ash 56.52-59.09; silica fume 30.43-31.82; the spill from crushing the spent coal lining of electrolysers 9.09-13.04 [RF Patent No. 2268866 С04В 35/16, С04В 35/14].

A disadvantage of the known composition is that wall materials made on its basis have relatively low indicators of frost resistance and high values of average density and thermal conductivity.

The technical result is an increase in frost resistance with a decrease in average density and thermal conductivity.

The specified technical result is achieved by the fact that the raw material mixture contains gas purification dust from the production of ferroalloys as a silica component, carbonized loam and a spill from crushing spent coal lining of electrolyzers as an aluminosilicate component in the following ratio of components, wt.%:

ferroalloy gas treatment dust 68.0-66.7 carbonized loam 29.1-28.6 Coal lining spillage 2.9-4.7

Gas cleaning dust from the production of ferroalloys is a dispersed waste with a specific surface area of 25 ... 34 m ² / g and an amorphous silicon oxide content of up to 75.14 wt. % The chemical composition of the gas treatment dust of the production of ferroalloys (wt.%): SiO ₂ 70.63-75.14; Fe ₂ O ₃ 1.76-1.78; MgO 1.77-2.44; Na ₂ O 0.94-1.15; K ₂ O 1.33-3.25; Al ₂ O ₃ 1.09-1.43; CaO 0.54-062; RFP 9.82-11.39.

1,45. Суглинок относится к умеренно пластичному сырью с низкой чувствительностью к сушке.The carbonized loam of the Anzebinsk deposit contains (wt.%): NaCl - 95.2; Ca ²⁺ - 0.58, Mg ²⁺ - 0.044, K ⁺ - 0.084 and $$S{O}_{\mathrm{four}}^{2-}$$

1.45. Loam is a moderately ductile raw material with low sensitivity to drying.

The spill from the crushing of the spent coal lining of electrolysis cells is a large-tonnage waste from the production of aluminum generated during the overhaul of electrolytic cells. The bulk density of the waste is 750 kg / m ³ , the predominant particle size is up to 1 mm.

The chemical composition of the spill from crushing spent coal lining of electrolyzers (wt.%): C - 53.31; Na - 11.76; K - 2.52; Al - 5.93; Ca - 0.15; F 11.97; Mg 0.18; Fe ₂ O ₃ 0.36; SiO ₂ - 1.07; Al ₂ O ₃ - 17.04; CaF ₂ - 0.05.

The combination of gas purification dust from the production of ferroalloys, carbonized loam and spillage from crushing spent coal lining of electrolyzers contributes to the formation of durable crystalline phases and a rational porous structure of the material.

Example. To prepare the raw material mixture, gas cleaning dust from the production of ferroalloys, carbonized loam, spill from crushing of the coal lining are used.

The process of preparing the mixture includes the following operations.

Loam is pre-crushed to a particle size of 1 mm or less.

The dry components are thoroughly mixed, then moistened to 19 wt.%, While granulating the mixture on a plate granulator.

From the obtained granular raw material mixture, the products are molded by semi-dry pressing at a specific 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 one 2 3 Ferroalloy gas treatment dust 68.0 67.3 66.7 Carbonized Loam 29.1 28.8 28.6 Spill from crushing of spent coal lining of electrolyzers 2.9 3.9 4.7

table 2 Indicator Structure Prototype one 2 3 Firing temperature 900 900 900 900 Compressive strength, MPa 17.5 14.2 12.5 22.6-28.7 The average density, kg / m ³ 1350 1340 1330 1550-1560 Estimated thermal conductivity, W / m ° С 0.589 0.585 0.579 0.696-0.702 Water absorption, wt. % 27 26.0 24.7 22.4-24.3 Softening coefficient 1.3 1.25 1,2 0.86-0.91 Frost resistance cycle 75 75 75 fifty

Claims (1)

The raw material mixture for the manufacture of wall ceramic products, including a silica component, an aluminosilicate component and a spill from crushing the spent coal lining, characterized in that the gas cleaning dust is used to produce ferroalloys, and the aluminosilicate component is carbonized clay loam in the following ratio .%:
ferroalloy gas treatment dust 68.0-66.7 carbonized loam 29.1-28.6 Coal lining spillage 2.9-4.7