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

在几乎熔化的反应中，气泡的形成是不可避免的，渣-金反应的界面区域偏离了两相的几何构型。为了更精确地研究渣-金反应机理，不能忽略气-金界面和气-渣界面的作用，而只考虑速度控制步骤，本工作中，含FeO或MnO的熔渣与含碳铁液在薄坩埚中反应，并利用四极质谱仪对反应过程进行气体分析。此外，还利用X射线透视法观察了渣-金属、气体-金属、气体-渣三个反应界面的变化。用计算机图像处理器对X线图像进行增强处理，并通过以下算法在短时间内定量确定相应的二维界面：（a）测量各相的边界长度L_S、L_M、L_G;（B）计算相应的界面A_<S/M>、A_ ...更多信息 <S/G>，A_<G/M>，根据方程_<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，计算了两种情况下的最大功率密度。其中，“t”表示坩埚的内部厚度。将计算机辅助图像处理技术应用于X射线透视中，可以清晰地观察到渣-金-气反应过程中各界面的微观结构。在渣-金界面处发现了胞状结构，气泡的生长与胞状结构的运动密切相关.研究发现，在FeO或MnO还原过程中产生的废气中含有二氧化碳，金属-气体界面的氧分压比渣-气体界面的氧分压高10倍左右.用各界面的有效面积分析MnO的还原速率时，认为气渣界面决定了反应的总速率。另一方面，在FeO的还原中，特别是在高浓度FeO的情况下，速率可能受气体-金属反应，即Boudouard反应控制。少

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