Slag evolution of Ti-bearing high basicity sinter during softening-melting process
LAN Dong1,2，LI Ting-le1,2，SUN Chang-yu1,2，WANG Qi1,2
（1. School of Materials and Metallurgy， University of Science and Technology Liaoning， Anshan 114051， Liaoning， China 2. Key Laboratory of Chemical Metallurgy of Liaoning Province， Anshan 114051， Liaoning， China）
Abstract：It is generally accepted that Ti-bearing sinter is more difficult to smelting in blast furnace process than common sinter because of its low content of Fe， complex compositions and mineral phase. However， the blast furnace coefficient in smelting Ti-bearing sinter is not inferior to that of some common sinter in practical production which may result from the difference of the slag evolution between Ti-bearing sinter and common sinter. In order to clarify the reasons for the difference and analyze the performance of Ti-bearing sinter in BF， the softening-melting property of Ti-bearing sinter was test firstly. Then samples interrupted at the softening-melting characteristic temperature were analyzed by scanning electron microscopy and X-ray diffraction in order to clarify the slag evolution of Ti-bearing high basicity sinter during softening-melting process. The results show that softening-melting temperature of Ti-bearing sinter was lower， the max pressure drop was 547 kPa which was lower than common sinter with the same basicity. In softening-melting process， the mineral phase of slag contained FeO， melitite and proviskite and the kinds of mineral phase of slag were unchanged. The main reason for low softening and melting temperature of Ti-bearing sinter was low eutectic temperature of the slag. The pressure drop curverised twice in softening-melting process which may resulted from the large difference of melting temperature between slag and metal.
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2018, Vol. 53 
