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Conversion of different Brazilian manganese ores and residues into birnessite-like phyllomanganate
Abstract This work describes the first synthesis of birnessite-type manganese oxides, using manganese ores and residues at the old mining site from Serra do Navio (Amapá State, northern Brazil) and Carajás mine (Pará State, northern Brazil). The preparation method involved dissolution of Mn2O3 followed by reprecipitation of the layer phase. The product prepared was confirmed to be a single phase, birnessite, that is thermally stable up to 500°C. At 600°C, the layer structure synthesized from ores transforms to cryptomelane, a tunnel-type structure. The samples were investigated by using the following techniques: X-ray Powder Diffraction (XRD), Thermal Analysis (DTA-TG), NIR FT-Raman Spectroscopy (NIR FT-Raman), Scanning Electron Microscopy (SEM) and elemental analysis.
Highlights Manganese ores and residues Synthesis of K-birnessite Thermal stability up to 500°C Transformation to cryptomelane Raman spectroscopy
Conversion of different Brazilian manganese ores and residues into birnessite-like phyllomanganate
Abstract This work describes the first synthesis of birnessite-type manganese oxides, using manganese ores and residues at the old mining site from Serra do Navio (Amapá State, northern Brazil) and Carajás mine (Pará State, northern Brazil). The preparation method involved dissolution of Mn2O3 followed by reprecipitation of the layer phase. The product prepared was confirmed to be a single phase, birnessite, that is thermally stable up to 500°C. At 600°C, the layer structure synthesized from ores transforms to cryptomelane, a tunnel-type structure. The samples were investigated by using the following techniques: X-ray Powder Diffraction (XRD), Thermal Analysis (DTA-TG), NIR FT-Raman Spectroscopy (NIR FT-Raman), Scanning Electron Microscopy (SEM) and elemental analysis.
Highlights Manganese ores and residues Synthesis of K-birnessite Thermal stability up to 500°C Transformation to cryptomelane Raman spectroscopy
Conversion of different Brazilian manganese ores and residues into birnessite-like phyllomanganate
Figueira, B.A.M. (Autor:in) / Angélica, R.S. (Autor:in) / da Costa, M.L. (Autor:in) / Pöllmann, H. (Autor:in) / Schenzel, K. (Autor:in)
Applied Clay Science ; 86 ; 54-58
13.10.2013
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Conversion of different Brazilian manganese ores and residues into birnessite-like phyllomanganate
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