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- Title
Caracterização de uma tipologia de minério de manganês do Brasil.
- Authors
Reis, Érica Linhares; Faria, Geraldo Lúcio; da Silva Araújo, Fernando Gabriel; Tenório, Jorge Alberto Soares; Vieira, Claúdio Batista; Júnior, Nelson Jannotti
- Abstract
In order to improve manganese-iron alloy production processes, an important Brazilian manganese ore typology, placed in Carajás, PA, was characterized. A representative sample was obtained from mine. The particle size determination was performed by screening, followed by chemical analysis using plasma spectrometry (ICP-AES). The physical properties studied included density, surface area and porosity measurements (BET). The mineral constituents was identified and quantified by X-ray diffraction. A termogravimetrical study was done in order to verify the thermal stability of major mineral constituents in the air. It was observed that 19.3% of studied typology was below 6.3mm. The manganese, silica and phosphorus contents were 52.63%, 1.92% and 0.17%, respectively. The oxides identified were cryptomelane, todorokite and pyrolusite. The other constituents were goethite, quartz, gibbsite, and kaolinite. According to the thermal study, the cryptomelane and pyrolusite start their decomposition in the air, at approximately 600°C. At around 950°C, Mn2O3 decomposition and Mn3O4 growth were observed.
- Subjects
CARAJAS (Brazil); BRAZIL; MANGANESE ores; DECOMPOSITION method; ALLOYS; ORE deposits; ANALYTICAL chemistry; PARTICLE size determination; SPECTROMETRY; X-ray diffraction; POROSITY
- Publication
Rem: Revista Escola de Minas, 2010, Vol 63, Issue 3, p517
- ISSN
0370-4467
- Publication type
Article
- DOI
10.1590/S0370-44672010000300014