Removal of Copper and Tin in Molten Iron with Decarburization under Reduced Pressure

摘要

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 experimeqt. 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. SiO_2 powder blowing was the most appropriate to eliminate copper and tin among SiO_2, MgO, iron ore and oxygen gas. In case of SiO_2 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 x 10~3 sec treatment. About 80% of the tin was removed from the melt containing 0.1 mass% sulfur as a volatile substance like SnS.