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本工作应用放射性同位素技术和无水电解液电解法测定铁液中溶解态稀土的含量,用直接比色法分析和计算铁液中溶解态的Al含量,在稀土作用过的Al_2O_3坩埚内,使用ZrO_2(MgO)固体电解质浓差电池直接测定铁液中溶解态的氧活度。用外推法求得铁液中RE-Al-O平衡常数K_(REAlO_3)和相互作用系数e_(RE)~(Al)与温度的关系式。对于CeAlO_(3(2))=[Ce]+[Al]+3[O]平衡反应 lgK_(CeAlO_3)=-37900/T+5.84 △G_(CeAlO_3)~0=173400-26.7T(cal/mol) e_(Ce)~(Al)=20500/T-13.53 对于NdAlO_(3(3))=[Nd]+[Al]+3[O]平衡反应 lgK_(NdAlO_3)=-24700/T+O.69 △G_(NdAlO_3)~0=113030-3.16T(cal/mol) e_(Nd)~(Al)=13500/T-9.33
In this work, the content of dissolved rare earths in molten iron was determined by radioisotope technique and nonaqueous electrolyte electrolysis method. The content of dissolved Al in molten iron was analyzed and calculated by direct colorimetric method. In the rare earth-doped Al 2 O 3 crucible, Direct Determination of Dissolved Oxygen Activity in Iron Solution Using ZrO_2 (MgO) Solid Electrolyte Concentration Cell. The relationship between RE-Al-O equilibrium constant K_ (REAlO_3) and interaction coefficient e_ (RE) ~ (Al) and temperature was obtained by extrapolation. For the equilibrium reaction of CeAlO 3 (2) = [Ce] + [Al] +3 [O] lgK CeAlO 3 = -37900 / T + 5.84 △ G CeAlO 3 ~ 0 = 173400-26.7T cal / mol ) e_ (Ce) ~ (Al) = 20500 / T-13.53 for NdAlO_3 (3) = [Nd] + [Al] +3 [O]. 69ΔG NdAlO_3 ~ 0 = 113030-3.16T (cal / mol) e_ (Nd) ~ (Al) = 13500 / T-9.33