材料期刊网

还原气氛下高炉渣中含钛物相的变化规律是高炉渣高温碳化的关键.实验综合偏光显微镜、扫描电镜(SEM)、矿物自动解理系统(MLA)和X射线衍射仪(XRD)对比还原前后高炉渣物相形貌变化,微区成分变化及物相组成变化规律.结果表明,还原前后高炉渣中串珠状的钙钛矿转变为弥散状的碳化钛,深绿色板状的富钛透辉石消失不见;微区成分变化显著的是钛元素也从还原前高炉渣中的钙钛矿、攀钛透辉石和富钛透辉石中逐渐转移到碳化钛相和残留的含钛透辉石相中,其含量占还原后全钛的73.69%以上;还原后物相组成明显的变化是钙钛矿和富钛深绿透辉石的减少,碳化钛含量明显增多.

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.