Abstract
Customarily the phenomenon of iron escaping is explained as the result of build-up of viscous slag bearing reduced titanium compound and Salamander in the hearth.
However, it seems that the quantity of iron escaping from cinder notch in case of a certain blast furnace is rather related to the low permeability of furnace column rather than to titanium content in burden.Thereupon, we examined the cause of the phenomenon by measuring slag viscosity and analyzing permeability of column.
As the result, the phenomenon is found to result not from the elevation of slag viscosity by titanium compound, but from the reduction of raceway by low permeability of column.
This is thought due to the irregularity of slag temperature around the core and a narrowing of space between the inner wall and the core by reduction of raceway.
