발간논문

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Vol.27, No.8, 706 ~ 714, 1989
Title
Simultaneous Dephosphorization and Desulfurization in Carbon Saturated pig Iron by CaO based Fluxes Containing Fe2O3 and CaF2
이상호Sang Ho Yi, 김경식Kyung Sik Kim, 심재동Jae Dong Shim, 백영현Young Hyun Paik
Abstract
An experimental investigation was carried out to clarify the behaviors of dephosphorization and desulfurization of carbon-saturated liquid iron by using the powdered flux of CaO-CaF₂-Fe₂O₃at 1350℃. Optimum compositions of flux were deduced from the series of investigations with variation if parameters such as the contents of Fe₂O₃ and CaF₂ and basicity index in the slag phase, and also initial silicon content in the liquid iron. It was found that the slag compositions of 40 to 50 wt% Fe₂O₃ higher basicity and lower CaF₂content were recommendable for the simultaneous removal of sulfur and phosphor from the melt. The beneficial effect of lower initial silicon content in the melt that observed in the dephosphorization was not similar1y applied to the desulfurization. It was also noticed that the presence of CaF₂ in the slag enhanced considerably both dephosphorization and also desulfurization evidently in comparison with that of CaCl₂, or Na₂CO₃. From the results of the present experiment, it is concluded that the high dephosphorization as well as desulfurization(70 % and 80 %, respectively) can be achieved by using CaO-CaF₂-Fe₂O₃ powdered flux under an Ar gas bubbling condition.
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