Composition and Properties of Titanium-Containing Blast Furnace Slags.

Samples of titanium-containing slag of AO EVRAZ NTMK from blast furnace processing of Ural titanomagnetite ore concentrate of the Kachkanar deposit were investigated to study the possibility of titanium extraction. The initial samples differed in the crystallization method. One sample was obtained by layer-by-layer pouring of slag into the trench and cooling it with water (hereinafter referred to as fast crystallization slags). The other sample was made of slag crusts that remained in a slab after draining its liquid part (hereinafter referred to as slow crystallization slags). The chemical and phase compositions of all studied samples were similar; the content of TiO₂ was about 10.5%. The main phase (matrix) was akermanite-gehlenite, which was approximately 65%. The titanium-containing phase was perovskite of about 26%. The fast crystallization slags were characterized by a fine structure of the titanium-containing phase with an average particle size of about 13 μm. The titanium-containing phase consisted of 88% of particles with an area of more than 100 μm² with an average particle size of 17 μm. The slow crystallization slags were characterized by a larger structure of the titanium-containing phase, the size of such particles was ~30 μm. The titanium-containing phase consisted of 92% of large particles with an area of more than 500 μm² with an average particle size of about 40 μm. For mechanical enrichment, it is preferable to use slags with slow crystallization characterized by large inclusions of the titanium-containing phase — perovskite. The size of the titanium-containing phase and the density ratio of perovskite and akermanite-gehlenite (matrix) at the level of 1.35 make it possible to investigate the mechanical separation possibility of titanium-containing concentrate by density on a concentration table. [ABSTRACT FROM AUTHOR]