Effect of addition of surface active element on supersaturation in iron melt

表面活性元素的添加对铁液过饱和度的影响

• 批准号: 06650827
• 负责人: INOUE Ryo
• 金额: $ 1.28万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650827/
• 关键词: Surface active element; Supersaturation; Liquid iron; Alumina; Precipitation; Interfacial energy; Hercynite; Al_2O_3生成; 界面反応; 一方向凝固; テルル; 介在物

The supersaturation and equilibrium experiments were carried out at 1873K by using Fe-Al alloys and CaO-Al_2O_3 slags in an Al_2O_3 crucible, and the effects of Te addition and cooling rate on supersaturation were studied. The conclusions were summarized as follows.1. Total oxygen content for a given total aluminum content obtained in equilibrium and supersaturation experiments without Te was not influenced by the cooling rate.2. In supersaturation experiments with Te addition, total oxygen contents decreased to a constant value as a result of the removal of precipitated Al_2O_3 in the range of [% Te]>0.005 and the degree of lowering increased with a decrease in cooling rate.3. The critical supersaturation ratio was estimated to be about 10^2 by considering the effect of Te on the interfacial energy between liquid iron and alumina.4. Tellurium distribution ratio between an Fe-Al alloy and CaO-Al_2O_3 slag was found to be linearly related to the aluminum content in logarithmic form with a slope of 2/3, suggesting that Te in slag is present as divalent anion.An Fe-0.03-0.44mass% Al alloy or an Fe-0.07-0.58mass% Al-0.2-0.6mass% Te alloy was reoxidized with the Fe_tO(<3mass%)-containing CaO-Al_2O_3 slags at 1873 K for 5 and 60 min. The effects of slag compositions, Te addition and initial Fe_tO contents on the reoxidation of aluminum were studied. The following conclusions were obtained .1. Acid-insoluble Al as primary inclusions containing alumina, hercynite and Fe_tO-Al_2O_3 mixture was observed in the experiments of using CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 5 min.2. The oxygen in liquid iron was supersaturated in the rapid cooling experments except those of the CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 60 min with Te addition.3. The relations between Fe_tO and Al contents were observed to be in equilibrium in the experiments except those of the CaO-Al_2O_3-Fe_tO slags saturated with an Al_2O_3 crucible at 5 min.

通过在Al_2O_3坩埚中使用Fe-Al Alloys和CAO-AL_2O_3渣在1873K进行过饱和和平衡实验，并研究了TE添加和冷却速率对超饱和的影响。结论总结如下1。在没有TE的情况下以平衡和过饱和实验获得的给定总铝含量的总氧含量不受冷却速率的影响。2。在添加TE的过饱和实验中，由于[％TE]> 0.005的降水AL_2O_3的去除，总氧含量下降到恒定值，并且降低程度随冷却速率降低而增加。3。通过考虑TE对液态铁和氧化铝之间的界面能量的影响，临界过饱和率估计约为10^2。4。发现Fe-Al合金和CAO-AL_2O_3炉炉之间的矫治分布比与对数形式的铝含量线性相关，斜率为2/3，这表明炉渣中的TE是二价阴离子中的TE。 -0.44MASS％Al合金或Fe-0.07-0.58mass％al-0.2-0.6mass％TE合金用Fe_TO（<3MASS％）重新氧化 - 含有CAO-AL_2O_3插槽，在1873 K，持续5和60分钟。研究了炉渣组成，Te添加和初始Fe_TO含量对铝再氧化的影响。得出以下结论.1。在使用CAO-AL_2O_3-FE__3将Al_2o_3 crucible饱满的cao-al_2o_3-fe_3中观察到含有氧化铝，赫西米和fe_to-al_2o_3混合物的酸 - 不溶性Al作为原发性夹杂物，hercynite和fe_to-to_to-al_2o_3混合物。液态铁中的氧气在快速冷却的实验中过饱和，除了cao-al_2o_3-fe_to的含量在60分钟时含有Al_2o_3坩埚饱和的cao-al_2o_3-fe_to。在实验中，观察到Fe_TO和Al含量之间的关系在实验中处于平衡状态，除了Cao-Al_2o_3-Fe_to在5分钟时用Al_2o_3 crucible饱和的CAO-AL_2O_3-FE_TO。