炭素飽和溶鉄によるスラグ中のTiO_2の還元速度

概要

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The reduction rate of TiO_2 in CaO-Al_2O_3-TiO_2 slag by Fe-C or Fe-Si-C melts in a graphite crucible was measured at 1420〜1600℃ under argon atmosphere. The mechanism of transport of titanium from slag to metal was discussed. The reduction rate of TiO_2 was strongly dependent upon temperature. It was concluded that the rate-determining step of the transport rate of titanium from slag to metal was chemical reaction at slagmetal interface. It has been turned out that, when Fe-Si-C melt was used, TiO_2 in the slag was reduced by carbon and silicon in the metal phase simultaneously. With increasing initial content of silicon in the metal, the transport rate of titanium from slag to metal, as well as the ratio of amount of TiO_2 reduced by silicon to overall TiO_2 reduced, was increased greatly. The transport rate of titanium in this case, however, was controlled by chemical reaction rate at interface and mass transport rate in the diffusion boundary layer in the slag. The contribution of the latter would become more important at higher silicon content in the metal.
社団法人日本鉄鋼協会の論文
1988-06-01