Quantification of moisture contents in iron and manganese ores.
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2013
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Resumo
The moisture contents of several synthetic and natural goethite-bearing samples were determined by
the loss-of-mass method and by the Karl-Fischer titration. It was found that drying at 105°C did not
remove all the water from these samples, and that temperatures above 200°C would be required to completely
remove the adsorbed water. The multiple peaks observed in the TGA and DSC measurements are
not due to the dehydroxylation of goethite, but are due to the release of adsorbed water. The decomposition
of goethite into hematite occurs with the release of adsorbed water from room temperature up to
the onset of the main dehydroxylation peak. The dehydroxylation occurs in a broad range of temperatures
due to the existence of a particle-size distribution, surface hydroxyls and formation of a hematite coating.
The determination of all adsorbed water is best performed by adding the powdered sample into the Karl-
Fischer reaction vessel.
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Moisture, Water content, Iron ore
Citação
COSTA, G. M. da et al. Quantification of moisture contents in iron and manganese ores. ISIJ International, v. 53, p. 1732-1738, 2013. Disponível em: <https://www.jstage.jst.go.jp/article/isijinternational/53/10/53_1732/_pdf>. Acesso em: 20 abr. 2017.