| The reduction rate of TiO₂ in the CaO-SiO₂-Al₂O-MgO-TiO₂ slags system by saturated carbon and silicon in iron melt was measured at 1350-1600℃. The mechanism of transport of titanium from slag to metal was dicussed. 1. The reduction rate of TiO₂ was strongly dependent on the temperature. It was concluded that the rate-determining step of the transport rate of titanium from slag to metal was chemical reaction at slag/metal interface. 2. The ratio of amount of TiO₂ reduced by silicon to overall TiO₂ reduced and the transport rate of titanium from slag to metal were increased greatly with increasing initial content of silicon in the metal. In this case, the transport rate of titanium from slag to metal was controlled by chemical reaction and mass transport rate. 3. The apparent activation energy of TiO₂-C, SiO₂-C, TiO₂-Si system were measured to be 2.2×10², 2.4×10², 2.5×10² (kJ.mol^(-1)). 4. The reduction rate of TiO₂ decreased with increasing ratio of CaO/SiO₂ in the acid slags(CaO/SiO₂< 1), whereas the reduction rate increased at the range of CaO/SiO₂> 1. |
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