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采用铁液与稀土脱硫产物直接平衡法,用化学分析与低温无水电解分离脱硫产物相结合方法测定了溶解状态的稀土元素和硫含量,研究得到五个轻重稀土元素Ce、La、Sm、Nd、Y在1600℃铁液中的脱硫常数和稀土元素与硫的相互作用系数: K_(LaS)=1.2×10~(-6);e_S~(La)=-2.8; K_(SmS)=1.9×10~(-6);e_S~(Sm)=-2.5; K_(CeS)=1.8×10~(-5);e_S~(Ce)=-0.87; K_(NdS)=4.6×10~(-5);e_S~(Nd)=-0.69; K_(YS)=6.3×10~(-5);e_S~Y=-0.51。 引用溶质元素相互作用系数对纯铁液中的稀土脱硫常数进行修正后得到16Mn,10MnNb,40MnNb三个低合金高强度钢中的稀土脱硫常数,结果表明其差值很小,说明上述铁液中热力学参数能适用于钢水。同时表明五个元素脱硫能力大小顺序为:La>Sm>Ce>Nd>Y。
The rare earth element and sulfur content in dissolved state were determined by the direct equilibrium method between molten iron and rare earth desulfurization products. The chemical composition of rare earth elements and sulfur in dissolved state were determined by the combination of chemical analysis and low temperature non-aqueous electrolytic desulfurization. Five rare and light rare earth elements Ce, La, Sm, Nd , The desulfurization constant and the interaction coefficient of rare earth element and sulfur in the molten iron at 1600 ℃ are as follows: K LaS = 1.2 × 10 -6 eS La ~ 2.8 and Sm Sm 1.9 × 10-6; e_S ~ (Sm) = -2.5; K_ (CeS) = 1.8 × 10 -5; e_S ~ (Ce) = -0.87; K_ (NdS) = 4.6 × 10 ~ -5); e_S ~ (Nd) = - 0.69; K_ (YS) = 6.3 × 10 ~ (-5); e_S ~ Y = -0.51. Referencing the solute element interaction coefficient, the rare earth desulfurization constants in the pure iron liquid were corrected to obtain the rare earth desulfurization constants in the three low alloy high strength steels 16Mn, 10MnNb and 40MnNb. The results show that the difference is very small, Thermodynamic parameters can be applied to molten steel. At the same time, the order of desulfurization capacity of the five elements is: La> Sm> Ce> Nd> Y.