不同钒钛磁铁矿炉料冶金性能的对比研究

取两种典型的钒钛磁铁矿对应的烧结矿和球团矿，研究其物相组成和微观结构并进行比较分析.模拟现场高炉条件，在实验室测定炉料软熔滴落性能，并对未滴落渣进行物相分析和微观结构分析.结果表明:高铬钒钛磁铁矿烧结矿以磁铁矿、赤铁矿为主，有少量的铁酸钙和硅酸盐，而高钛钒钛磁铁矿烧结矿铁酸钙和硅酸盐较多，还出现明显的钙钛矿;两种钒钛磁铁矿球团矿没有明显差异.相比高钛钒钛磁铁矿炉料，高铬钒钛磁铁矿炉料有高的熔化温度，较窄的熔化区间，其更有利于高炉的顺行.高铬钒钛磁铁矿未滴落渣以黄长石为基质相，而高钛钒钛磁铁矿未滴落渣以辉石为基质相，在金属铁周围遍布较多粒状TiC.

Comparative Study on Metallurgical Performance of Different Vanadium-Titanium Magnetite Burdens

The phase composition and microstructure of sinter and pellet of two typical vanadium-titanium magnetites were studied. The softening-smelting-dripping properties of burden(sinter+pellet)were measured through simulation in laboratory. The results show that high chromium vanadium-titanium magnetite sinter is mainly composed of magnetite， hematite and a small amount of calcium ferrite and silicate， while high titanium vanadium-titanium magnetite sinter contains more calcium ferrite， silicate and perovskite. However， there are no significant differences in phase composition and microstructure between the two pellets. Compared with high titanium vanadium-titanium magnetite burden， high chromium vanadium-titanium magnetite burden has higher melting temperature and narrower melting range， which are beneficial to blast furnace. The matrix phase of non-dripped slag of high chromium vanadium-titanium magnetite is melilite， but the non-dripped slag of high titanium vanadium-titanium magnetite contains pyroxene as matrix phase and TiC around metallic iron.