Molchanov L. Resource- and energy-saving technology of hot metal desulphurization by using magnesium that recovered from exothermic charges in the depth of melt

The thesis aims to develop the theoretical foundations of recovery process of metal oxides directly in the melt, the rational development of resource-saving and energy-efficient technologies of hot metal desulphurization by using magnesium oxide recovered directly in the melt due to heat of joint exothermic reactions. The results of theoretical and experimental studies of hot metal desulphurization processes by using magnesium, recovered in the melt due to heat of joint chemical reactions were generalized. By using the modern techniques of high temperature studies the reliable information on the physicochemical characteristics of hot metal desulphurization process by the magnesium, recovered in the melt due to heat of joint chemical conversions was obtained. The most efficient way to input exothermic charges containing magnesium oxide in the melt is in the form of briquettes made on a ligament of sodium (potassium) water glass and wrapped with a paper husk. The presence of the water glass components in the composition of the briquette allows decreasing the temperature of aluminothermic reduction start of metal oxides and improves the efficiency of the process due to gel formation.Experimentally determined that the application of developed exothermic charges for reduction of magnesium oxide, a degree of hot metal desulphurization reaches 69.4% and chromium one reaches 40%.