Phase Composition of the Vanadium-Containing Titanium Slags Forming upon the Reduction Smelting of the Titanomagnetite Concentrate from the Kuranakhsk Deposit

摘要

The phase composition of the vanadium-containing titanium slags that form upon the reduction smelting of the titanomagnetite concentrate from the Kuranakhsk deposit with an added CaCO_3 flux is studied by optical microscopy, X-ray diffraction, and scanning electron icroscopy. The laws of formation of the phase composition and the interphase distribution of vanadium and other elements are revealed as a function the CaO and FeO contents in the slags. It is shown that, at low CaO contents (up to 5%), the phase composition of the slags containing 15–30% FeO is mainly represented by spinelides (Al–V–Cr and Al–Ti–V spinels and (Fe,Mg)_2TiO_4 ulvospinel), anosovite, and glass. When the CaO content in slag increases, titanium is fixed into perovskite. At 17–20% CaO and ≤8.3% FeO in slag, a new crystalline phase, i.e., Ca–Al–V titanate of a com-plex composition, forms along with perovskite, the Al–V–Cr spinel, anosovite, and glass. Vanadium in the slags is mainly distributed between anosovite, the spinelides, and the Ca–Al–V titanate, and vanadium is absent in the glassy phase.