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| A STUDY OF THE EQUILIBRIUM OF Ce-S-O IN MOLTEN IRON |
| Wang Changzhen;Wang Fuzhen;Du Yingmin;Zhang Xiaoping North-Eastern Institute of Technology |
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Cite this article:
Wang Changzhen;Wang Fuzhen;Du Yingmin;Zhang Xiaoping North-Eastern Institute of Technology. A STUDY OF THE EQUILIBRIUM OF Ce-S-O IN MOLTEN IRON. Acta Metall Sin, 1980, 16(1): 83-90.
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Abstract 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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Received: 18 January 1980
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