Abstract
For on-line determination of Mn in molten steel at converter, analysis of fine dust generated from the molten steel by atomic absorption spectrometry was examined. According to the characterization of the dust in dust collecting water, Mn was selectively evaporated from the molten steel to yield Mn enriched dust, but the amount of Mn in the fine dust (<10 μm) reflected on Mn content in molten steel. Atomic absorption analytical system with flame atomizer was developed for direct analysis of the fine dust and this was coupled with 0 G dust of the converter. Only fine particles extracted from the dust with cyclone were directly and continuously introduced into the atomizer of the system. The good linear correlation was obtained between the Mn contents of fine particles and the molten steel at the blowing end. But, the data obtained at the 8595% completion of blowing end showed poorer correlation between the Mn contents of the particles and molten steel. The reason was considered for that the relative evaporation rate of Mn to Fe varied at the 8595% completion of blowing end.
