SU1534038A1 - Initial charge for making high-temperature heat-insulating articles - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the manufacture of products for the heat insulation of furnace units and power equipment with an insulated surface temperature of up to 1150 ° C. In order to reduce shrinkage at high temperatures and increase heat resistance, the mixture for the manufacture of high-temperature thermal insulation products contains, in wt.%: Expanded perlite 26-42

refractory clay 24-44

production waste electrocorundum 9-34

coal preparation waste 8-14. The resulting products have a shrinkage at 1150 ° С 0.32-0.47% and a heat resistance of 52-68 cycles. 4 tab.

Description

The invention relates to the industry of building materials and can be used in the manufacture of products for the thermal insulation of furnaces and power equipment with an insulated surface temperature of up to 50 ° C.

The purpose of the invention is to reduce shrinkage at high temperatures and increase heat resistance.

In the charge, for the manufacture of high-temperature insulating products, the waste of the production of alumina, which is formed during the electric smelting of alumina and the further separation of alumina, is used. The refractoriness of these wastes is 1950-1980 ° C. Their particle size distribution is presented in Table 1.

The chemical composition of the used waste products of electrocorundum, wt.% SiOa 2.60; A1 “, 03 92.63; Geo 0.70; MgO 0.32; CaO 0.70; TiOz 1.80; Cr20s 1.00; ppt 0.25.

Coal preparation waste is a product formed during the flotation of coal with a softening temperature of 1360-1380 ° C. The granulometric composition of waste coal is presented in table 2.

The content of coal dust particles in the waste is in the range of 16.3-17.9%.

The chemical composition of waste coal, wt.%: 810 g 42.50-48.60; 17.60-29.65; MgO 0-0,85; CaO, 1.54-1.78; FeO 1.72-1.78; FetO, 2,36sd

:about

4t tt

eo

2.68; RtO 2.72-2.78; ppt 19.51-25.83.

In combination with the expanded vermiclite, during firing, a finely porous structure is formed, which allows it to withstand sharp fluctuations in temperature without cracking the products and to reduce the shrinkage of the products at service temperatures.

 Example. In shshkeromeshapka a slip with a density of 1.18-1.2 g / cm is prepared on the basis of refractory g. A metered amount of slurry is introduced into the mixer and mixed for 1-1.5 minutes with the waste of production of electrocorundum and waste coal, then load the metered amount of exfoliated medium density vermiculite 125. 130 kg / m1 fraction 0-10 mm and mix until a homogeneous, semi-dry granular mass is obtained. The compositions of the raw materials are given in table 3.

Products molded from raw materials are dried at 125 ± 5 ° C for 24-26 h and burned at a maximum temperature (1000CC) for 2 h.

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Physico-technical properties of the products are given in table 4.

The use of the proposed composition also makes it possible to obtain a certain technical, economic and ecological effect through the use of electrocorundum production wastes and coal enrichment wastes.

Claims (1)

Invention Formula The mixture for the manufacture of high-temperature insulating products, including expanded vermiculite, refractory clay and refractory filler, characterized in that, in order to reduce shrinkage at high temperatures and increase heat resistance, it additionally contains waste coal, as well as refractory filler, production waste, which also contains waste coal, and waste materials, which also contain waste coal, and waste materials, which also contain heat-resistant waste, as well as refractory aggregate. in the following ratio, wt.%: Expanded vermiculite 26-42 Refractory clay 24-44 Waste from the production of electrocorundum9-34 Coal Beneficiation Waste Table 1-, table 2 Table 3