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首页> 外文期刊>Metallurgical and Materials Transactions >Determination of the Chemical Diffusion of Oxygen in Liquid Iron Oxide at 1615 ℃
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Determination of the Chemical Diffusion of Oxygen in Liquid Iron Oxide at 1615 ℃

机译：1615℃下液态氧化铁中氧气化学扩散的测定

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The chemical diffusion of oxygen in liquid iron oxide has been studied by the oxidation of a melt in a long capillary at 1615 ℃. When pure oxygen was used as the oxidizing agent, the surface composition of the slag was found to be in close agreement with the expected gas-slag equilibrium, suggesting that diffusion is the controlling step. This was not the case when air, 5 pct oxygen in argon or pure CO_2 was used to oxidize the slag. The deviation of the surface composition from the expected equilibrium was in accordance with a mechanism of mixed control by both the gas-slag reaction and diffusion in the bulk. The average value of the chemical diffusivity of oxygen (or iron) in liquid iron oxide with Fe~(2+)/Fe_T between 0.25 and 0.77 was established to be 3(± 1) x 10~(-7) m~2/s. This value is one to two orders of magnitude higher than those from earlier studies. There seems to be a reasonable correlation between the chemical and the ionic self-diffusivities through the Darken equation. A quantitative analysis in this respect and on the role of electron hole migration depends on the availability of data on the ionic-conductivity and the tracer diffusivities.
机译：通过在1615℃下在长毛细管中将熔体氧化，研究了氧在液态氧化铁中的化学扩散。当使用纯氧作为氧化剂时，发现炉渣的表面组成与预期的炉渣平衡非常吻合，表明扩散是控制步骤。当使用空气，5％的氩气中的氧气或纯CO_2氧化炉渣时，情况并非如此。表面组成与预期平衡的偏离是根据通过气体-炉渣反应和在本体中扩散两者的混合控制的机理进行的。 Fe〜（2 +）/ Fe_T在0.25至0.77之间的液态氧化铁中氧（或铁）的化学扩散系数的平均值为3（±1）x 10〜（-7）m〜2 / s。该值比早期研究的值高一到两个数量级。通过Darken方程，化学和离子自扩散率之间似乎存在合理的相关性。在这方面以及对电子空穴迁移作用的定量分析取决于离子电导率和示踪剂扩散率数据的可用性。

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