Resumo

FARIA, G.L.; REIS, E. L.; JANNOTTI, N.  e  ARAUJO, F.G.S.. Chemical, physical and typological characterization of main brazilian manganese lump ores. Lat. Am. appl. res. [online]. 2013, vol.43, n.1, pp. 17-22. ISSN 1851-8796.

The physical, chemical and typological characteristics of manganese lump ores from three Brazilian mines, Azul, Morro da Mina and Urucum are presented herein. The chemical analysis was done by AES-ICP and titration. The typological characterization was obtained by optical microscopy and X-ray diffraction. The physical properties studied included density, surface area and porosity. The Azul, Urucum and Morro da Mina Mn contents are, respectively, 47.68, 42.69 and 28.44%. The Urucum lump ore presents the highest structural density (4.29g/cm³), followed by Azul (3.98g/cm³) and by Morro da Mina (3.56g/cm³). The Urucum, Morro da Mina and Azul bulk porosities are 22.68, 10.79 and 29.40cm³/kg, respectively. The oretypological classifications are: anhydrous-oxide for Urucum, hydrated-oxide for Azul and silicate-carbonate for Morro da Mina. The thermogravimetric analysis showed that the ore weight losses could be associated to different phenomena, depending on the ore typology.

Palavras-chave : Manganese; Lump Ores; Brazilian Deposits; Characterization; Typological Classification.