Blast Furnace Ironmaking Process with Super High TiO 2 in the Slag: High-Temperature Structure of the Slag
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THE V-Ti-Magnetite ore (VTM) is one of the special metallurgical resources and plays a vital role in the blast furnace (BF) ironmaking process in China because of its large reserves.[1–3] During the smelting process,[4–6] the proportion of VTM used in the BF is only about 65 pct; as a consequence, the TiO2 in the BF slag is about 22-23 mass pct, which is characterized as high ZHENGDE PANG, XUEWEI LV, JIAWEI LING, YUYANG JIANG, and JIE DANG are with the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044, P.R. China and also with the College of Materials Science and Engineering, Chongqing University, No. 174 Shazheng Street, Shapingba District, Chongqing 400044 P.R. China. Contact e-mail: [email protected] ZHIMING YAN is with the WMG, the University of Warwick, Coventry, CV4 7AL. Contact e-mail: [email protected] Manuscript submitted March 7, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS B
TiO2-bearing BF slag. The thermo-physical properties of TiO2-bearing slag influence the smooth operation of the BF, which affects both the quality and recovery rate of hot metal and influences some technical-economical indexes. Further raising the proportion of VTM in the BF burden improves the extraction efficiency of V and Ti elements in the follow-up process. Based on material balance calculations, increasing the proportion of VTM (i.e., from 65 to 100 pct) used in the BF process would further increase the TiO2 content in the slag to approximately 30 mass pct. This kind of slag was defined as super high TiO2-bearing BF slag in this study. This change in the BF slag composition has a drastic impact on its physicochemical properties. The structure of matter determines its properties; therefore, the physicochemical properties of the slag (e.g., viscosity) depend primarily on the structure of slag at high temperatures. Because the use of the high proportion V-Ti-magnetite ore results in the formation of super high TiO2 blast furnace slag, we conducted a series of investigations on the physicochemical properties of this kind of slag. We,
therefore, proposed the technology of ‘‘replacing CaO with MgO’’ to optimize the BF slag in the ironmaking process and solve the slag foaming problem and operation difficulties; details pertaining to this were given in the authors’ previous study.[7] Most studies that discuss the high-temperature structure of the BF slag are based on results from studies in the geological science field by Mysen et al.,[8–15] Virgo,[16] and McMillan et al.[17–20] Since the latter part of last century, the slag structure has mainly been studied by Bockris et al.[21,22] and the research output of the slag structure has increased, particularly in metallurgical and ceramics industries. In particular, Mysen et al.[8–15] systematically studied the structure of silicate melts and identified specific anionic units by determining the distinct vibrational modes related to the T-O bond (here ‘‘T’’ represents Si, Al
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