Analysis on permeability of blast furnace block zone

The changes of permeability index of blast furnace block zone under the condition of different pellet ratio, sinter grain sizes and sinter bed depths were studied by experiments. The sinter with particle size less than 10 mm would make the permeability of blast furnace block zone sharply worse. As to the constant value of furnace charge grain size of blast furnace burden, once the layer thickness increased, the permeability of blast furnace block zone reduced. With the increase of pellet ratio, the pressure difference of blast furnace burden showed a state of rising first and then stabilization, and the permeability of blast furnace block zone increased.