Carbothermal reduction and nitridation of ilmenite concentrates of different grades and synthetic rutile
were studied in isothermal experiments in hydrogen – nitrogen gas atmosphere and pure nitrogen in a
tube reactor. Concentrations of CO and CO2 in the off gas were measured online using infrared gas analyser.
The reaction products were analysed by X-ray diffraction. Iron oxides in ilmenite concentrates were
reduced to metallic iron, and titanium oxides were converted to titanium oxycarbonitride. Reduction of
ilmenite concentrates and synthetic rutile in hydrogen containing gas was significantly faster than in pure
nitrogen. The rate of conversion of titania to titanium oxycarbonitride in the 50 vol% H2-50 vol% N2 gas
mixture decreased with increasing grade of ilmenite concentrate. In nitrogen, reduction of synthetic rutile
was faster than reduction of ilmenite concentrates.