Abstract
An on-line determination by an atomic absorption spectrometric method was developed to indirectly determine manganese in molten steel. Particles under 10 μm contained in the fine dust generated from molten steel were directly introduced into an air-acetylene flame, and the atomic absorption signal of manganese in the flame was determined. It was found that manganese was selectively evaporated from the molten steel to yield a manganese-enriched dust. However, the amount of manganese in the fine dust (<10 μm) reflected the manganese content in the molten steel. The evaporation ratio of manganese to iron was dependent on the evaporation temperature. The manganese contents in molten steel could be estimated using the manganese to iron evaporation mass ratio at a constant evaporation temperature. The concentration of manganese in the molten steel has a linear relationship with the atomic absorption signal-ratio of manganese to iron determined in the fine particle dust at the end of blowing.
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