SU1636393A1 - Mix for refractory production - Google Patents

Abstract

This invention relates to the refractory materials industry. The aim of the invention is to increase the strength at a temperature of up to 1480 ° C, reducing the wettability of the refractory material with scrap metal and shpak. P1hichna for the manufacture of refractories contains, in wt.%: Waste heat insulating filling production of silicon carbide products of a fraction of 0.5-3 mm 30-60; the fused hapineleforming component of the fraction up to 1 mm in composition, m s.%: AlgO 35-85; 9- 35; CrH03 4-12; 2-18; magnesite powder fraction less than 0.066 mm 3-5. Durability at C up to 41 MPa, metal slag wettability from 0.7 mm is 2.5 times lower than that of analog. 3 tab. WITH S

Description

This invention relates to the refractory materials industry.

The aim of the invention is to increase the strength at a temperature of up to 1480 ° C, reducing the wettability of the refractory metal and putty.

Example. It is melted in a single-phase electric furnace with a current-carrying fused spinel-forming component. The composition for smelting includes alumina and zirconium-containing raw materials, such as kaolin, with the addition of a reducing agent and cast iron shavings, followed by the introduction of magnesite and chromite into the melt in quantities that provide complex spinel.

The compositions of the spinel-forming component are shown in table 1.

The melt is poured into a graphite mold with subsequent processing on standard equipment for the production of raw materials for refractories.

The waste heat insulating material used in the production of silicon carbide products consists of silicon carbide grains in an amount up to 95% of the 3-0.5 mm fraction, subjected to heat treatment of 10-10 times.

The fused spinel-forming component prepared in predetermined quantities, the waste products of the production of silicon carbide products and magnesite powder are mixed on runners with I5O5

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in the process of mixing a temporary bond in the form of technical lignosulphonate with a density of 1.23 g / cm3 or a solution of magnesium sulphate with a density of 1.17 g / cm3 to obtain a moisture content of the mixture up to 3.5%. as cylinders with a diameter of 36 mm and a height of 50 mm are pressed with a force of 130 MPa. After drying to a residual moisture content of 0.5%, the samples are subjected to heat treatment at 1040-1350 ° C for 15 cycles per day.

The composition of the charge is presented in table 2. Physico-mechanical properties of the samples in the table. 3

For comparison, use the known composition of the mixture, wt.%: Silicon carbide 39; electrocorundum, doped with zirconium dioxide in the amount of 5–30%, fraction 2–0 mm 45; refractory clay 12; time link 4.

Claims (1)

Invention Formula A mixture for the manufacture of refractories, including a carbide-silicate component, an alumina-based refractory component, alloyed with zirconia, and a temporary bond, characterized in that ten -, 2; t5 20 . 25 , 6363934 temperature to reduce the wettability of orof the metal and slag, it contains as a silicon carbide component waste heat insulating filling production of silicon carbide products of fraction 0.5-3 mm, as a refractory component based on alumina doped with zirconia, fused spinel forming fraction 0-1 mm composition, wt.%: Alj.0335-85 MgO9-35 CrgOe4-12 2yr032-18 and additionally magnesite powder fraction less than 0.066 mm in the following ratio, wt.%: Waste heat insulating filling of the production of silicon carbide products of the fraction 0.5-3 mm30-60 Fused spinel-forming component of the fraction of the specified composition 0-1 mm35-67 Magnesite powder fraction less than 0,066 mm3-5 thirty Components The content of components, wt.%, In the composition lIIIZ-ilLI --- 11-1 thirty 69 35 60 Table 1 Table 2 R 51 67 72 .45 thirty 20 thirty 69 thirty 69 35 60 35 60 Indicators Sample values for sample 1 2 11 t | famous Porosity is open, % for composition: A13,9 B13,7 B14,1 Mechanical strength compression at 1480 ° C MPa, for composition: A31 B30 B30 Metal slag wettability, detectable penetration depth molten metal, ptakoemulsii -v sample at 1610 ° С, mm: 51 67 72 45 thirty 20 51 67 72 45 thirty 20 Table3 14.1 13.9 14.1 14.5 32 31 31 21 Continued table 3