本实验采用ZrO_2(MgO)固体电解质氧浓差电池直接测定氧的活度,用放射性测量技术及低温无水电解分离夹杂的方法,考察了电解分离过程中La_2O_2S的稳定性并测定了铁液中溶解态的La含量,对实验数据用平衡值外推法处理得到: 1550℃ K_(La_2O_2S)=3.81×10~(-19) e_S~(La)=-4.1 1600℃ K_(Li_2O_2S)=6.45×10~(-19) e_S~(La)=-4.8 1650℃ K_(Li_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(1873K) 实验结果表明La具有比Ce,Nd,Y更强的脱硫氧能力。
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.
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