Conversion of different Brazilian manganese ores and residues into birnessite-like phyllomanganate
Source abstract
Abstract
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 (Amapa State, northern Brazil) and Carajas mine (Para 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Geochemistry and Elemental Analysis · Radioactive element chemistry and processing · Clay minerals and soil interactions
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