起電力測定による転炉炉中溶鋼酸素の迅速分析

抄録

In order to utilize EMF method as a rapid determination of oxygen content of molten steel in commercial LD converter, a preliminary study was first carried out by using a furnace with graphite heating element. Then, a device to use in practical LD converters was developed successfully. The device was like a temperature measuring device of molten steel, and composed of a holder and a consumable part covered with a paper sleeve. Air was used as the reference and a piece of small rod of ZrO₂ stabilized by CaO was fused at the end of quartz tube as an electrolyte sensor in the consumable part. In a commercial 80 t LD converter, the influence of slag and the temperature difference between the inside and the outside of the electrolyte were also clarified. After correcting the thermal EMF caused by the temperature difference, the relation between EMF and the analysed oxygen values was nearly in agreement with the theoretical one obtained in Fe-C-O melts in the small scale furnace. Reproducibility of this method was fairly good and within 5% in the coefficient of variation.