Activity coefficient of antimony and arsenic in molten iron and carbon saturated iron

In connection with removal of tramp elements from molten iron and steel, activity coefficients of arsenic and antimony in carbon saturated iron and in pure iron were determined between 1473 to 1923 K and between 1823 to 1923 K, respectively, by measuring the distribution of those elements between the metals and silver. The following activity coefficients are observed: for carbon saturated iron: log γ_As = 3560/T + 1.14, log γ_Sb = 6890/T + 5.06; and for molten iron: log γ°_As = - 198/T - 1.41, log γ°_Sb = - 7030/T + 4.38, respectively. The possibility of the removal of arsenic and antimony from molten iron by using a BaO-BaF₂ flux is discussed.