Applying Low Titanium Blast Furnace Slag to Semi-steel Steelmaking: Dephosphorization Thermodynamics and Industrial Experiment
WANG Baohua1, 2, ZHU Rong1, HUANG Shiping3, GONG Yongyu2, WANG Shizhao2, ZHANG Mingbo1, 2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083; 2 HBIS Company Limited Chengde Branch, Chengde 067102; 3 Hesteel Group Central Iron and Steel Research Institute, Shijiazhuang 050023
Abstract: In order to comprehensively utilize low-titanium slag and improve the dephosphorization rate of semi-steel steelma-king, the semi-steel slag ball made of low-titanium slag with injecting CO2 desulfurization treatment and 25%—30% of the oxide scale was used for semi-steel melting. The dephosphorization thermodynamic model of semi-steel slag system and the method of industrial test were established and conducted to study the dephosphorization and metallurgical impact of semi-steel slag ball. The results indicated that the dephosphorizing capacity would be reduced with increasing w(TiO2) and w(Al2O3), especially under the low temperature and low alkalinity conditions. Compared with Al2O3, the TiO2 can reduce the dephosphorization of slag more. The lgLp and lgCp increased first and then almost invariant with increasing alkalinity, increased first and then decreased as w(FeO) increase, and decreased with the w(MgO) increase. When the semi-tempered slag ball was used in semi-steel steelmaking, the w(TiO2+Al2O3) and w(FeO) of slag increased and the basicity and MgO decreased. The optimum condition for semi-steel smelting is that the basicity of slag is about 4.0 and the proportion of semi-tempered slag ball is 15.0%—20.0 % of total slag, and this will result in relatively high lgLp and lgCp of slag, as well as relatively low adverse influence of w(TiO2+Al2O3) on lgLp and lgCp. The early stage dephosphorization rate can be increased to 58.59%, which is 1.57 times of that of the original smelting process. Besides, the per ton lime consumption and the [O] in final steel decrease by 3.48 kg·t -1and 112×10-6, respectively.
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2018, Vol. 32 
