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本文应用冶金反应动力学模型讨论了在Ar气流下脉冲加热石墨坩埚中的熔融钢试样时提取氧的机理,这比仅用热力学原理讨论反应进行的可能性要有实际意义。确定了试样析出氧的限制环节是熔池中氧的传质,并证实该反应为一级反应。得出析出氧的动力学方程式[％O]=[％O]_0eXP(-0.1735τ)。计算k_0=0.03cm/sec,与真空条件下所得结果一致。由实验制定的析出氧的工作曲线可以确定试样熔融时间,大约20秒以上氧可基本全部析出,并且氧的残留率为ψ=0.03～0.05较合适。试验结果表明,利用动力学原理进行理论探讨所得结论与实际分析过程相符合。
In this paper, the mechanism of oxygen extraction in the pulsed heating of molten steel samples in a graphite crucible under Ar gas flow is discussed in this paper, which is of more practical significance than discussing the possibility of the reaction using only the thermodynamic principle. It is confirmed that the limiting part of the oxygen precipitation of the sample is the mass transfer of oxygen in the molten pool and the reaction is confirmed as a first-order reaction. The kinetic equation for the oxygen evolution was found [% O] = [% O] _0eXP (-0.1735τ). Calculate k_0 = 0.03 cm / sec, consistent with the results obtained under vacuum conditions. The experimentally developed working curve of oxygen evolution can determine the melting time of the sample, and almost all of the oxygen can be precipitated in about 20 seconds or more, and the oxygen residual rate of ψ = 0.03-0.05 is more suitable. The experimental results show that the conclusions drawn from theoretical discussions using the principles of dynamics are consistent with the actual analysis.