| The thermodynamic behaviors of antimony in molten iron-carbon alloys at high temperature was investigated in connection with the possibility of removal of tramp elements by chemical equlibrating technique. The effects of antimony, carbon content and temperature on the activity coefficient of antimony in molten iron was determined by measuring distribution ratio of antimony between Fe-C alloy and silver. Though the effect of Sb content on activity coefficient, ε^(Sb)_(Sb) , was null at the lower than 0.1wt% Sb, the effect of carbon on Sb activity coefficient, ε^(Sb)_(Sb) was estimated as 10.32 at 1673K. The dependence of the acvtivity coefficient of antimony on temperature was determined as follows ; For carbon saturated iron : ln γ ^(Fe-C○)_(Sb)=-14280/T+10.20 For molten iron : ln γ^O_(Sb)=-23000/T+13.19 Combining the effects of temperature and carbon, the activity coefficient in Fe-C alloy could be expressed as follows; ln γ ^(Fe-C_(Sat.)_(Sb)=(-23000/T+13.19)+ε^O_(Sb)·X_o where, ε^O_(Sb)= 64260/T-28.09 and [%C]^(sat)_(Fe)=0.647+2.54X 10^(-3)·T(K) The possibility of the removal of antimony from molten iron by evaporation was discussed. |
|
