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Acta Metall Sin  1986, Vol. 22 Issue (2): 68-74    DOI:
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EQUILIBRIUM OF Fe-La-O-S SYSTEM
CHEN Dong; HAN Qiyong; WANG Tao; XIANG Changxiang (Beijing University of Iron and Steel Technology)
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CHEN Dong; HAN Qiyong; WANG Tao; XIANG Changxiang (Beijing University of Iron and Steel Technology). EQUILIBRIUM OF Fe-La-O-S SYSTEM. Acta Metall Sin, 1986, 22(2): 68-74.

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Abstract  A study was made of the equilibrium of Fe-La-O-S system. The oxygen activity was directly measured by the solid electrolyte sensors made of ZrO_2(MgO) tube. The stability of La_2O_2S in the electrolytic separation and the content of La as dissolved state in liquid iron were examined by means of radioassay and electrolytic isolation of inclusion in organic electrolyte under low temperature. By extrapolation of data obtained, the equilibrium constant of La_2O_2S may be described as: 1550℃ K_(La_2O_2S)=3.81×10~(-19) e_s~(La)=-4.1 1600℃ K_(La_2O_2S)=6.45×10~(-19) e_s~(La)=-4.8 1650℃ K_(La_2O_2S)=7.41×10~(-19) e_s~(La)=-4.2 La(1)=[La] △G_(sol)~0=-136700+59.82T, γ_(La)~0=0.33 (1873 K) It seems that the deoxysulphurizing effect of La is more intense than that of Co, Nd and Y.
Received:  18 February 1986     
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