Caracteriza??o metal?rgica do Produto Granulado de Mangan?s de Urucum.

Este trabalho estudou importantes par?metros metal?rgicos do Produto Granulado de Urucum, que s?o: a degrada??o granulom?trica das part?culas a frio e a quente, a decomposi??o t?rmica e a efici?ncia de pr?-redu??o. Uma tonelada do material foi recebida e amostras representativas foram compostas para os procedimentos de caracteriza??o. Para os estudos de decomposi??o t?rmica um ?ndice foi proposto: Evolu??o de Decomposi??o T?rmica (EDT), por meio do qual mapeou-se as rea??es de decomposi??o t?rmica de seus minerais constituintes. Para estudar a redu??o no estado s?lido foram propostos dois par?metros quantitativos, que s?o: Efici?ncia de Pr?-redu??o (EP) e Velocidade Instant?nea de Pr?-redu??o (VIP). Por meio deles, observou-se que o min?rio tem boa redutibilidade no estado s?lido. Para a caracteriza??o da degrada??o granulom?trica foram propostos tr?s par?metros quantitativos: ?ndice de Desintegra??o Granulom?trica a Frio (DGF), ?ndice de Crepita??o (IC) e ?ndice de Desintegra??o Granulom?trica a Quente (DGQ). Por meio deles observou-se que este min?rio n?o apresenta significativa degrada??o granulom?trica a frio, entretanto ele ? suscept?vel ? desintegra??o a quente.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