CARACTERIZAÇÃO METALÚRGICA DO PRODUTO GRANULADO DE MANGANÊS DE URUCUM

Abstract

This work proposes a study about important metallurgic parameters of Urucum manganese lump ore, which are: cold and hot particle disintegration mechanisms, heat decompositions and the pre-reduction behavior. A tone of the studied ore was received and representative samples were collected for characterization procedures. Aiming to study ore heat decompositions, it was proposed a quantitative index named Evolution of Heat Decomposition (EHD). Using this index, the chemical and mineralogical characterization data, it was possible to determine the main reactions of mineral decomposition. Two quantitative parameters were proposed to describe the ore solid state reduction; these indexes were named Pre-reduction Efficiency (PE) and Pre-reduction Instantaneous Rate (PIR). Applying these parameters it was possible to conclude that Urucum lump ore has a great pre-reduction behavior. The characterization of particle disintegration was performed using three new indexes for manganese ores, which were: Cold Disintegration Index (CDI), Decrepitation Index (DI) and Hot Disintegration Index (HDI). These indexes showed that the studied ore did not presents significant cold particle disintegration, but it is susceptive to decrepitation and hot particle disintegration