Reaction Anlysis Based on the Measurement of Areas of Respective Interface in slag-metal-gas reaction.

基于渣-金属-气反应各自界面面积测量的反应分析。

• 批准号: 61550486
• 负责人: ISHI Kuniyoshi
• 金额: $ 1.34万
• 依托单位: Hokkaido 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: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550486/
• 关键词: Reduction of Liquid Iron Oxide; Slag-Metal Reaction; Reaction Kinetics; Area of Reaction Interface; X-ray Fluoroscopy; 画像処理; 鉄鋼製錬工学; スラグ-メタル反応

In the almost smelting reaction, gas bubbles are inevitably formed and interfacial area of slag-metal reaction deviates from geometrical configuration of both phase. In order to precisely investigate the mechanism of slag-metal reaction, therefore, the roles of gas-metal and gas-slag interface can not be neglected for thinking of what is the rate controlling step.In the present work, molten slag containing FeO or MnO was reacted with carbon bearing liquid iron in the thin crucible and the processes were followed by gas analysis using a quadrupole mass spectrometer. In addition, the change of three reaction interfaces of slag-metal, gas-metal, and gas-slag was observed by X-ray fluoroscopy. The X-ray image was enhanced by computer-aided image processor and respective two-dimentional interface was quantitavely determined in short time interval by means of following algorism: (a) Measurement of boundary length of each phase, L_S,L_M,L_G, (b) Calculation of respective interface, A_<S/M>,A_ … More <S/G>,A_<G/M>, according to the equations of _<S/M>=t (L_S+L_M-L_G)/2, A_<S/G>=t (L_S-L_M+L_G)/2, A_<G/M>=t (-L_S+L_M+L_G)/2. Where, "t" denotes a inner thickness of crucible.1. The microstructure of respective interface during slag-metal-gas reaction could be sharply observed by applying computer-aided image processing technique to the X-ray fluoroscopy. The cellular structure was found at slag-metal interface and bubble growth was seen to closely relate with the motion of cells.2. It was found that carbon dioxide was included in the exhaust gas generated during the reduction of FeO or MnO reduction and Oxygen pressure of metal-gas interface was about ten times higher than that of slag-gas interface.3. When the reduction rate of MnO was analysed by using the effective area of respective interface, it was suggested that gas-slag interface was determining the overall rate of reaction. On the other hand, in the reduction of FeO, especially in case of high FeO concentration, the rates might be governed by gas-metal reaction, namely Boudouard reaction. Less

在几乎熔炼反应中，不可避免地会形成气泡，使渣-金属反应界面面积偏离两相的几何构型。因此，为了准确地研究渣-金属反应机理，气-金属和气-渣界面的作用不可忽视，必须考虑什么是速度控制步骤。在本研究中，将含FeO或MnO的熔渣与含碳的液态铁在薄坩埚中反应，然后用四极杆质谱仪进行气体分析。通过x射线透视观察了渣-金属、气-金属、气-渣三个反应界面的变化。通过计算机辅助图像处理器增强x射线图像，在短时间间隔内定量确定各自的二维界面，方法如下：(a)测量各相边界长度L_S，L_M,L_G; (b)计算各自的界面，A_< S/M>,A_…More <S/G>,A_<G/ G>，根据方程_<S/M b> =t (L_S-L_M+L_G)/2, A_<S/G>=t (L_S-L_M+L_G)/2, A_<G/M>=t (-L_S+L_M+L_G)/2。式中，“t”表示坩埚的内部厚度。在x射线透视中应用计算机辅助图像处理技术，可以清晰地观察到渣-金属-气体反应过程中各界面的微观结构。在渣-金属界面处发现了微泡结构，微泡的生长与微泡的运动密切相关。研究发现，FeO或MnO还原过程中产生的废气中含有二氧化碳，金属-气体界面的氧压比渣-气体界面的氧压高约10倍。利用各界面的有效面积分析MnO的还原速率，表明气渣界面决定了反应的总速率。另一方面，在FeO的还原过程中，特别是在FeO浓度较高的情况下，其还原速率可能受气-金属反应，即Boudouard反应控制。少

项目成果

K. Ishii: "A Study of Reduction of Iron Oxides with H_2-CO-CO_2 Mixtures by Means of Gas Analysis" Proceedings of 5th International Iron and Steel Congress. Book3. 9-17 (1986)

K. Ishii：“A Study of Reduction of Iron Oxides with H_2-CO-CO_2 Mixtures by Means of Gas Analysis”第五届国际钢铁大会论文集。

石井邦宜: 鉄鋼基礎共同研究会界面移動部会討論資料集. 1. 1-16 (1986)

Kuniyoshi Ishii：钢铁基础联合研究组界面迁移小组委员会讨论材料集。1. 1-16 (1986)。

石井邦宜: 鉄鋼基礎共同研究会界面移動部会討論資料集. 界面1. 1-16 (1986)

Kuniyoshi Ishii：钢铁基础联合研究组界面迁移小组委员会讨论材料集 1. 1-16 (1986)。

石井邦宜: 北海道大学工学部研究報告. 132. 21-30 (1986)

石井国芳：北海道大学工学部研究报告。132. 21-30 (1986)

K. Ishii: "Morphology of Carbon Deposited on Pure Iron from Carbon Monoxide" Journal of the Japan Institute of Metals. 50. 767-770 (1986)

K. Ishii：“一氧化碳在纯铁上沉积的碳的形态”日本金属学会杂志。