ESTUDO DO REAPROVEITAMENTO DO GÁS DE TOPO DE ALTO-FORNO A CARVÃO VEGETAL PARA REDUÇÃO DO FENÔMENO DE CREPITAÇÃO EM GRANULADOS DE MINÉRIO DE FERRO

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