Abstract
This study was made to clarify the phenomena of the transfer of sulfur from coke to metal when the metal is molten down in cupola.
A sulfurous oxidized film is formed on the surface of the metal passing the preheating zone. This film is very thin and the diffusion of the sulfur in the film into the metal was not recognized. In the melting zone, the solid metal changes to a molten drop state, and sulfur absorption increases rapidly up to about 60-80% of total absorption. One of the source of supply of sulfur is the S2 gas near the surface of the coke and the other is the SO2 gas in the combustion atmosphere.
It was confirmed that there is less sulfur pick-up in pig iron than in steel. The reason for this phenomenon was considered to be that there are plenty of C and Si in pig iron which activates desulfurization.
