不同钒钛磁铁矿炉料冶金性能的对比研究
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摘要
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Ti C.
The phase composition and microstructure of sinter and pellet of two typical vanadiumtitanium 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.
The phase composition and microstructure of sinter and pellet of two typical vanadiumtitanium 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.
引文
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