Abstract
Titanium slag is a basic raw material for production of titanium dioxide, widely used in various branches of national economy. Titanium slag is produced out of ilmenite concentrate. In Russian Federation there are several ilmenite deposits of ledge and placer type under various stages of development. Laboratory studies of ilmenite concentrates of Malyshevskoye, Irshanskoye and Medvedevskoye deposits processing technologies carried out. Two-phase technological scheme proposed, including ilmenite-coal briquettes reducing in an annular furnace and smelting of hot metallized briquettes in an ore-smelting furnace resulting in titanium slag and pig iron obtaining. Ilmenite concentrates were mixed with anthracite, bonding agent, briquetted and reduced in an annular furnace. After reducing the hot metallized briquettes were smelted in an electric furnace at 1650 ° С and the smelting products were casted into molds. The chemical and size composition of ilmenite concentrates and chemical composition of metallized briquettes presented. Technical indices of the annular furnace operation at metallized briquettes production and chemical composition of titanium slag and pig iron obtained out of the mentioned deposits ilmenite concentrates cited. It was determined, that the production of briquettes with high degree of metallization in the annular furnace is possible at heat treatment mode, providing a quick heating until the temperature of 1400-1500 °С. The cycle of the briquettes heat treatment in the annular furnace can be 15-30 min, including the phases of charging, heating, roasting, cooling and discharging. To study the heat treatment parameters effect on the process of coal-thermal reducing of ilmenite concentrates briquettes, a heat-physical model was elaborated. The model was based on studies of coal-thermal reducing kinetics of briquettes comprising ilmenite and anthracite, as well as zonal heat and material balances of oxidizing-reducing processes in the annular furnace. A technological scheme of titanium slag from ilmenite concentrates of Malyshevskoye, Irshanskoye and Medvedevskoye deposits proposed.
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