Aula Matti, Mäkinen Ari, Fabritius Timo
Laboratory of Process Metallurgy, Box 4300, 90014 University of Oulu, Finland.
Appl Spectrosc. 2014;68(1):26-32. doi: 10.1366/13-07079.
Control of chromium oxidation in the electric arc furnace (EAF) is a significant problem in stainless steel production due to variations of the chemical compositions in the EAF charge. One potential method to control chromium oxidation is to analyze the emission spectrum of the electric arc in order to find indicators of rising chromium content in slag. The purpose of this study was to determine if slag composition can be gained by utilizing electric arc emission spectra in the laboratory environment, despite electric arc voltage fluctuations and varying slag composition. The purpose of inducing voltage fluctuation was to simulate changes in the industrial EAF process. The slag samples were obtained from Outokumpu Stainless Oy Tornio Works, and three different arc currents were used. The correlation analysis showed that the emission spectra offer numerous peak ratios with high correlations to the X-ray fluorescence-measured slag CrO(x)/FeO(x) and MnO/SiO2 ratios. These ratios are useful in determining if the reduction agents have been depleted in the EAF. The results suggest that analysis of laboratory-scale electric arc emission spectra is suitable for indicating the high CrO(x) or MnO content of the slag despite the arc fluctuations. Reliable analysis of other slag components was not successful.
由于电弧炉（EAF）炉料化学成分的变化，控制电弧炉中的铬氧化是不锈钢生产中的一个重大问题。一种控制铬氧化的潜在方法是分析电弧的发射光谱，以便找到炉渣中铬含量上升的指标。本研究的目的是确定在实验室环境中，尽管存在电弧电压波动和炉渣成分变化，是否可以通过利用电弧发射光谱来获得炉渣成分。引入电压波动的目的是模拟工业电弧炉过程中的变化。炉渣样品取自奥托昆普不锈钢公司托尔尼奥工厂，并使用了三种不同的电弧电流。相关性分析表明，发射光谱提供了许多与X射线荧光测量的炉渣CrO(x)/FeO(x)和MnO/SiO2比率具有高度相关性的峰值比率。这些比率有助于确定电弧炉中的还原剂是否已耗尽。结果表明，尽管存在电弧波动，但对实验室规模的电弧发射光谱进行分析仍适用于指示炉渣中高CrO(x)或MnO含量。对其他炉渣成分的可靠分析未获成功。
