CONTROL OF THE FORMING BEHAVIOR OF ANOSOVITE IN THE REDUCTION OF ILMENITE BY HYDROGEN

摘要

Low content of TiO_2 and high impurities content of Ca and Mg are the shortcomings of domestic ilmenite. To meet the requirements of the material in the titania produced by chlorination process and titanium sponge industry, enrichment of ilmenite is necessary. In the process of enriching ilmenite, high temperature and reductive condition were beneficial to the formation of anosovite, but the high content of magnesium oxide which was solid soluble in anosovite baffled the following separation. So the effects of pre-oxidation and reductive conditions including reduction temperature, reduction time and hydrogen concentration on the phase composition and metallization rate were studied. The characteristics of reduction samples were analyzed by X-ray diffraction and optical microscope. Results have shown that the reduction product is mainly composed of Fe, Fe(Mg)TiO_3 and TiO_2 at 1123K, its metallization rate is about 65%, magnesium exists in Fe(Mg)TiO_3.