1996 Volume 36 Issue Suppl Pages S62-S65
The weak oxidizing powder blowing method (VOD-PB) was applied to remove copper and tin from molten iron with decarburization in a 1.0-1.5 ton scale experiment. The results demonstrated that the technique was applicable to removal of these metals from iron melted from scrap under practical reduced pressure of about 130 Pa. SiO2 powder blowing was the most appropriate to eliminate copper and tin among SiO2, MgO, iron ore and oxygen gas. In case of SiO2 powder blowing, removal percentages of copper and tin from molten iron containing less than 0.01 mass% sulfur were 30-40 and 20-30%, respectively, in 7.2×103 sec treatment. About 80% of the tin was removed from the melt containing 0.1 mass% sulfur as a volatile substance like SnS.