1. College of Materials Science and Engineering，Chongqing University，Chongqing 400044，China 2. Manufacturing Department，Wuhan Iron and Steel Group，Wuhan 430081，Hubei，China
Abstract：The effect of calcium aluminate refining ladle casting residue instead of fluorite used as converter fluxing agent on dephosphorization efficiency was investigated in the current study. Firstly， the effect of Al2O3 and CaF2 used as converter fluxing agent on the activity of dephosphorization products and phosphorus capacity were studied through Factsage software， respectively. Then， for futher studies on the substitute proportion and the application effect of refining ladle casting residue instead of fluorite used as converter fluxing agent， hot experiments were performed by the MoSi2 furnace under laboratory conditions. Finally， industrial tests were conducted in Wuhan Steel. The results show that using Al2O3 or CaF2 used as converter fluxing agent， to achieve high dephosphorization rate， the requirement for final slag basicity of both two fluxes was almost the same. Although the fluxing ability of CaF2 was obviously better than that of Al2O3， Al2O3 had a thermodynamic advantage on dephosphrization reaction compared with CaF2. Because Al2O3 in flux could decrease the activity of dephosphorization products and increase the phosphorus capacity of slag. As[w((Al2O3))]was from 5.0% to 9.0%， the dephosphorization rate was equal to that of the flux when[w((CaF2))]was from 3.0% to 6.0%. When the Wuhan Steel ladle refining casting residue was used as converter fluxing agent， the proportion of substituting casting residue for fluorite was 2.5：1. Meanwhile the industrial tests show that， by comparison to the slag using fluorite as fluxing agent， the dephosphorization rate of molten steel in converter endpoint was improved by 3.0 %.
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2016, Vol. 51 
