Kinetic Study on Decarburization of Molten Iron and Iron-Chromium Alloy in Ultra Low Carbon Concentration Range

1.一种argon-oxygen混合物被吹到了溶解物的表面上。即使氧化物的部分压力也很低，在熔融表面上形成了一种氧化物薄膜，并降低了降解率。实验结果是由氧化物薄膜中的速率过程中的反应模型解释的。在镁、氧化物中溶解铁在镁、氧化铝和钙中的分解实验中，用燃烧的argon气体、用熔融氧化物反应形成CO的碳。A反应模型被提议在氧化物的分离反应中，在氧化物界面形成CO反应，等等。这个模型可以解释实验结果.....。在订购时，以固体氧化物的摩尔铁和铁铬合金的降解率增强，真空吸光度测量方法已被采用在一个非常低的碳集中范围内进行降解。该方法的原理是，在反应界面中形成二氧化碳气体的过程通过污染氧化物被吸干，而另一面则保持在真空中。“去烧实验是由沉浸在熔融中的多孔管制成的。”管子的内部已经蒸发了。该管的组成部分包括Al_2O_3、SiO_2、MnO、Fe_2O_3、Cr_2O_3等。由于氧化物的高分离压力和大污染的管，十溴化速率较高。一个Al_2O_3-SiO_3管可以比一个Al_2O_3管更快地分解熔体。Moreover，由于管中含有石英石（SiO_2）形式的SiO_2高于多层（3Al_2O_3·2SiO_2）形式的SiO_2。熔融倾向于渗透到Al_2O_3-Fe_2O_3管的极点。

1. An argon-oxygen mixture was blown onto the surface of molten iton for decarburization. Even though the oxygen partial pressure was quite low, an oxide film formed on the melt surface and reduced the rate of decarburization. The experimental result is explained by a reaction model in which the rate process at the oxide film is considered.2. In experiments of decarburization of molten iron in magnesia, alumina and calcia crucibles with blowing argon gas, carbon in the melt reacted with crucible oxides to form CO. A reaction model is proposed in which the dissociation reaction of the oxide, CO formation reaction at the crucibleoxide interface, etc. are taken into account. The model can explain the experimental results.3. In order to enhance the decarburization rate of molten iron and ironchromium alloy with solid oxides, the vacuum suction degassing method was adopted for decarburization in a very low carbon concentration range. The principle of the method'is that the CO gas formed at the reaction interface is sucked through the porous oxide, the other side of which is kept at a vacuum. The decarburization experiments were made by immersing a porous tube into the melt. The inside of the tube was evacuated. The components of the tube were Al_2O_3, SiO_2, MnO, Fe_2O_3, Cr_2O_3, etc. The decarburiza-tion rate was higher for the oxide of higher dissociation pressure and the tube of larger porosity. An Al_2O_3-SiO_<> tube could decarburize the melt much faster than an Al_2O_3 tube. Moreover, the decarburization rate was higher for the tube containing SiO_2 in the form of cristbalite (SiO_2) than in the form of mullite (3Al_2O_3・2SiO_2). The melt tended to penetrate into the pore of Al_2O_3-Fe_2O_3 tube.