Viscosity and free running temperature of ultra-high TiO2 bearing blast furnace slag
PANG Zheng-de1,2, LÜ Xue-wei1,2, YAN Zhi-ming3, BAI Chen-guang1,2, XIE Hong-en4,5, PAN Cheng4,5
1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; 2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials, Chongqing University,Chongqing 400044, China; 3. WMG, University of Warwick, Coventry CV4 7AL, The United Kingdom; 4. Pangang Group Research Institute Co. , Ltd. , Panzhihua 617000, Sichuan, China; 5. State Key Laboratoryof Vanadium and Titanium Comprehensive Utilization, Panzhihua 617000, Sichuan, China
Abstract：Increasing the proportion of V-Ti-magnetite ore in the burden of blast furnace (over 80% even 100%) is of a great significance to the deep development and comprehensive utilization of V-Ti-magnetite resources ore in Panxi area. In view of the situation that the high proportion of V-Ti-magnetite ore brings ultra-high TiO2 blast furnace slag, the technology of "replacing CaO with MgO" for the slag optimization was proposed. The effect of the w(TiO2) and w(MgO)/ w(CaO) on the viscosity and free running temperature of CaO-SiO2-TiO2-MgO-Al2O3slag were investigated. The results indicated that the viscosity evidently decreases with increasing w(TiO2) at a range of 20% to 34%. Conversely, increasing w(MgO)/ w(CaO) from 0.32 to 0.65 causes a slight increase of viscosity of the slag. The free running temperature firstly increases, then slightly decreased with w(TiO2). However, the free running temperature firstly decreases, then increases with w(MgO)/ w(CaO). When w(MgO)/ w(CaO) is near 0.57 (w(MgO) is 12%), the slag free running temperature reaches the lowest point, and the range is about 50 ℃. "Replacing CaO with MgO" leads to the slag liquid phase area move from the vicinity of perovskite precipitated phase to a wide area between perovskite phase and spinel phase. It is feasible to reduce the free running temperature of slag by using "replacing CaO with MgO" w(MgO)/ w(CaO) slag-making, which has important theoretical significance for high-efficiency blast furnace ironmaking process with V-Ti-magnetite ore.
庞正德, 吕学伟, 严志明, 白晨光, 谢洪恩, 潘成. 超高TiO2高炉渣黏度及熔化性温度[J]. 钢铁, 2020, 55(8): 181-186.
PANG Zheng-de, LÜ Xue-wei, YAN Zhi-ming, BAI Chen-guang, XIE Hong-en, PAN Cheng. Viscosity and free running temperature of ultra-high TiO2 bearing blast furnace slag[J]. Iron and Steel, 2020, 55(8): 181-186.
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2020, Vol. 55 
