用直接法研究1600℃时溶铁中Ce-S-O平衡关系,测定了Ce的脱氧、脱硫、脱硫氧常数,并进行了有关的热力学探讨.由测得数据算出Ce的溶解自由能(△G_溶~0);活度系数(γ_(Ce)~0);克原子分数和百分浓度的交互作用系数ε_(Ce)~(Ce),e_(Ce)~(Ce);生成Ce_2O_2S的自由能△G_(Ce_2O_2S)~0.
Deoxidation and desulphurization equilibra between cerium, sulphur and oxygenin molten iron at 1600℃ have been determined and studied thermodynamically.The apparent solubility products of these reactions are:Ce_2O_(3(s))=2[Ce]+3[O] K_(Ce_2O_3)=[%Ce]~2[%O]~3=(1.0-3.2)×10~(-14)Ce_2O_2S_(s)=2[Ce]+2[O]+[S] K_(Ce_2O_2S)=[%Ce]~2[%O]~2[%S]=(1.6-3.5)×10~(-13)CeS_(s)=[Ce]+[S] K_(CeS)=[%Ce][%S]=(1.5-5.7)×10~(-4)The interaction coefficients are concerned:K_(Ce_2O_2S)=α_(Ce)~2 α_O~2 α_S=3.9×10~(-14)K_(CeS)=α_(Ce)α_S=1.9×10~(-5)The standard free energy change for reaction Ce_(1)=[%Ce] has been found to beΔG_(S,Ce)~0=-24000cal(100.4kJ) from which γ_(Ce)~0=0.39_7 is obtained. The self-interac-tion coefficient of Ce is calculated to be ε_(Ce)~(Ce)=1.9 and e_(Ce)~(Ce)=0.0032. Combining theseresults with those from literatures, the change of standard free energy for reaction2Ce_(1)+1/2S_2+O_2=Ce_2O_2S_(S) is ΔG_(Ce_2O_2S)~0=-241000 cal (1008.3kJ).
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