溶銑への Al 添加による石灰吹き込み脱硫反応の促進

概要

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Improvement was obtained for the reaction efficiency of hot metal desulfurization by lime powder injection with N_2 gas by prior addition of aluminum. That is, the desulfurization rate was markedly faster for Fe-C_<sat>-Si-Al-S melt than for Fe-C_<sat>-Si-S melt. Reaction layers on a lime lump immersed in the melts were examined by use of electron probe microanalysis and X-ray diffraction. The improvement of reaction efficiency of lime by aluminum addition was interpreted by the following results of the investigation. In Fe-C_<sat>-Si-S melt, solid 2CaO・SiO_2 and 3CaO・SiO_2 layer were formed on the lime surface, which retarded sulfur transfer to its interior. On the contrary, for Fe-C_<sat>-Si-Al-S melt, molten CaO-Al_2O_3-FeO layer was formed on the lime surface, which enhanced sulfur transfer, and moreover the layer disolved sulfur up to appoximately 50%. Aluminum concentration to get the improvement of reaction efficiency of lime for plant scale operation in 250^t torpedo ladle was determined to be 0.005+⊿Al%, where ⊿Al is the amount of aluminum loss during the desulfurization.
社団法人日本鉄鋼協会の論文
1982-04-01