STUDY TO REUSE OF THE EXHAUST GASES OF THE BLAST FURNACE TO REDUCE THE DECREPITATION IN IRON ORE GRANULES

The phenomenon of particle size degradation of minerals due to decreptation is presented as source of fines. In the present work, a study of iron ores decrepitation by employing a system of thermal pretreatment of iron ore was carried out reusing exhaust gases from a mini charcoal blast furnace located in the state of Minas Gerais. The experiments were carried out in two periods of seven days each one, where in the first period the pretreatment system was deactivated and in the second period was activated. The results showed an improvement in the burden permeability by the reduction of the granules decreptation when it was used the thermal pretreatment, reflecting in a increasing of production