Effects of Additives in BaO-BaF_2-MnO Slag on Phosphate and Manganese Capacities
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The effects of various additives (CaO, MgO, SiO<sub>2</sub>, CaF<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub>) in BaO-BaF<sub>2</sub>-MnO slags on the distribution ratios of phosphorus and manganese between the slags and ferro manganese have been studied at 1300°C. The dephosphorization ability of BaO-BaCl<sub>2</sub>-MnO slag is also investigated. It is found that replacement of BaO with CaO or MgO causes a decrease in the phosphate capacity and an increase in the manganese capacity, and that substitution of BaF<sub>2</sub> with CaF<sub>2</sub> or SiO<sub>2</sub> results in a poor dephosphorizing ability and more losses of manganese from metal to slags. CaF<sub>2</sub> in BaO-BaF<sub>2</sub>-MnO slags strongly reduces the BaO activity, which diminishes the beneficial action of BaO in the slags on dephosphorization. Comparing with BaO-BaCl<sub>2</sub>-MnO slags, BaO-BaF<sub>2</sub>-MnO slags give a higher dephosphorizing capacity. Critical contents of different additives in BaO-BaF<sub>2</sub>-MnO slags to achieve an effective dephosphorization have been given. <br>Based on the fact that the relationships between optical basicity and the phosphate and manganese capacities are only valid in a restricted range of slag compositions, the relationships between the capacities and optical basicity and slag composition have been derived by considering the interaction of slag components and analyzing a host of experimental data from different authors. These relationships are expected to be useable in a wider range of slag compositions and temperatures and to predict the phosphorus and manganese contents in metal without serious error.
- Transactions of the Iron and Steel Institute of Japan
Transactions of the Iron and Steel Institute of Japan 38(1), 36-45, 1998-01-15
The Iron and Steel Institute of Japan