Recently with the aim of increasing the stability of converter linings there has been extensive use of a new class of synthetic magnesia modifiers that are added directly to the converter melt during steel melting. The chemical composition of modifiers and method for their preparation are provided. The basis of the magnesia modifiers is MgO oxide and its compounds. Modifier properties (density, open porosity) are studied in relation to a change in specimen heating and the mineral composition of modifiers of different chemical composition, and the change in the structure of modifier specimens during heating is examined. The mechanism of modifier dissolution in molten slag is suggested.Processing iron in an oxygen converter is accompanied by formation of slag saturated with a considerable amount of iron oxides that have a negative effect on the converter lining. The corrosive nature of slag with respect to the converter lining, and in fact the amount of MgO passing from the lining into the molten slag in a unit of time is considerable at the start of blowing, it decreases during the decarburizing period and increases towards the end of blowing as a result of an increase in the solubility of refractory MgO in the iron slag [1].The wear mechanism of periclase-carbon refractories is accompanied by the following processes:liquid-phase decarburization of the lining surface layer by iron oxides and free oxygen;infiltration of slag into the decarburized layer; reaction between the refractory and slag that leads to transfer of MgO into the slag.Thus wear of periclase-carbon refractories of the converter lining is explained by the fact that iron oxide reacting with the refractory at high temperature during blowing of the metal (above 1600°C) by the reaction C + 2(FeO) = CO 2 + [Fe] forms pores through which there is penetration of slag into the decarburized layer.Wear rate v, kg/sec, of the lining is generally described by the equation [2]:where F is lining contact area with the slag, m 2 ; C 1 and C 2 are the concentration of the diffusing component into the refractory and slag respectively, kg/m 3 ; d is diffusion boundary layer effective thickness, m; D 1 and D 2 are the diffusion coefficients in the refractory and slag respectively, m 2 /sec.It follows from Eq. (1) that the lining wear rate is directly proportional to the concentration of the diffusing component into the solid and liquid phases, i.e. it depends on the concentration of iron and magnesium oxides in the slag. Therefore a reduction in the corrosive action of high iron slag on the lining may be provided by introducing magnesium-containing materials into the melt.As applied to the solubility of periclase refractory in converter slag Eq. (1) may be replaced by the expression [3]:where dn/dt is magnesium oxide dissolution rate; t is time; D is MgO diffusion coefficient in the slag; F is slag' refractory reaction surface; d is diffusion layer thickness at the inCompany (OAO), Magnezit Plant OAO, Tormag Limited Liability Company (OOO), Russia. terface; n s is ...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.