Abstract
This work was designed to better understand the softening and melting phenomena of ferrous feed materials in the blast furnace. In this article, the evolution of the microstructure above the softening temperature and the interaction between different types of pellets were analyzed. Experiments were performed with individual pellets as well as with mixed basic and acid pellets pre-reduced to 60 or 80 pct reduction. The samples showed the exudation of liquid from the acid, but not from the basic pellets. The interrupted experiments with mixed burden showed that above 1150 °C, there is an interaction between the acid and the basic pellets along their interface, whereas the cores of the pellets in these experiments were similar to those in the single burden experiments. The width of this interaction varies between 0.5 and 1.3 mm, depending on the temperature and pre-reduction degree. These results show that the slag from the acid pellet exuded and reacted with the surface of the basic pellet.
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