Abstract:The change raw of titanium-containing phases in blast furnace slag under reducing atmosphere is the key for high temperature carbonization of blast furnace slag. The change of phase morphology, the composition in micro area and the change law of the phase composition for blast furnace slag before and after reduction were investigated with polarizing microscope, scanning electron microscope (SEM), mineral liberation analyzer (MLA) and X-ray diffractometer (XRD). The results showed that the bead-like perovskite in blast furnace slag changed to scattered titanium carbide after reduction, and the dark green plate-shaped titanium-rich diopside disappeared. For the composition in micro area, the significant change was that titanium was also gradually transferred from perovskite, Panzhihua titanium diopside and titanium-rich diopside in blast furnace slag before reduction to titanium carbide phase and residual titanium-containing diopside phase, and its content was higher than 73.69% in total titanium after reduction. For the phase composition, the content of perovskite and titanium-rich dark green diopside decreased obviously, while the content of titanium carbide significantly increased after reduction.
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SHI Zhi-xin,LIU Jin-yan. Discussion on phase evolution law of high titanium blast furnace slag before and after selective reduction. , 2017, 37(6): 14-19.
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