The development of online analysis methods for industrial electric arc furnaces (EAFs) has been a major research topic in recent years. Process control becomes even more important in the future due to the increase in both the usage of recycled metal as charge material and the metal recycling rate. For the industry to keep up with the pace, reliable chemical analysis of the slag together with online information about the furnace operation status is essential. Herein, optical emission spectroscopy is used to obtain the information about the electric arc together with radiative properties and surface temperature of the molten bath in an industrial EAF. The arc is visible for high alloyed steel grades within 5–30 min before tapping and the arc spectra are dominated by the optical emissions from the slag components. The plasma properties of the electric arc are determined with emission lines from atomic chromium, iron, and calcium. The time evolution of the spectra for high alloyed and carbon steel grades are compared with each other to provide a better understanding of the differences in the spectra between these two steel grades.

中文翻译：

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发射光谱作为工业电弧炉在线分析方法

近年来，用于工业电弧炉（EAF）的在线分析方法的开发已成为主要研究课题。由于回收金属作为装料的使用量和金属回收率的增加，将来过程控制变得更加重要。为了使行业跟上步伐，对炉渣进行可靠的化学分析以及有关炉子运行状态的在线信息至关重要。在本文中，使用发射光谱法来获得关于电弧的信息以及工业EAF中熔池的辐射特性和表面温度。在出钢前的5-30分钟内，高合金钢的电弧可见，电弧光谱受炉渣成分的光发射支配。电弧的等离子体特性由原子铬，铁和钙的发射线确定。将高合金钢和碳钢等级的光谱随时间变化进行比较，以更好地了解这两种钢等级之间的光谱差异。