Investigation of the thermal properties of carbon-containing refractory materials obtained from metallurgical waste in the SHS method

Abstract

This work is devoted to the technology of obtaining carbon-containing refractories by the SHS method with maximum transformation of low-melting phases into refractory ones using waste metallurgy of ferroalloy production, as well as to the study of thermophysical properties, composition and the effect of specific heat fluxes on temperature stresses in conditional hypothetical layers of obtained carbon-containing SHS-refractory products. Slags from ore-thermal furnaces and cakes obtained by wet trapping and filtering of dust sediment were used as raw materials. The technology of self-propagating high-temperature synthesis (SHS) was proposed and tested, according to which, in the process of the redox reaction of aluminothermal combustion, reduced metals, interacting with carbon, form refractory carbides, and low-melting silicates (fayalite, olivine, monticellite, etc.) decompose and silicon oxides of various modifications react with magnesium oxide to form refractory forsterite and with iron oxides to form magnesiouustite (MgOFeO) and magnesioferrite (MgOFe₂O₃), etc., thereby minimizing the amount of fluxes in the material. It has been established that in the process of SH-synthesis, the amount of silicates (monticellite, fayalite) decreases to 0.8-1.5% and the amount of refractory components, including silicon carbide, increases. Temperature stresses and specific heat fluxes are calculated at the heating rate of the working surface from 4.3 ^оC/min to 55^оC/min with isothermal exposure of products at 1300 ^оC. thermal resistance is established.