In the report “Studies of hanging of a blast furnace-I”, we reported the results of investigation into the cause of the phenomenon that the permeability of iron ore bed is reduced. In this report, in order to exploit this phenomenon in the tendency of hanging in a blast furnace, we investigated the effects of some factors on the time till the permeability of iron ore bed is reduced.
The results obtained were as follows:
(1) About such factors which affect chemically on CO-resolution reaction, as FeO content in ore, CO and CO₂ in reducing gas, a close relationship between acceleration of carbon deposition and the time till the permeability of iron ore bed is reduced was established.
(2) The catalytic action of H₂ in reducing gas was weak, and there was no effect of H₂ in reducing gas under 10% H₂.
(3) Ore size and ore/coke ratio affect physically the Tendency of hanging in a blast furnace.