Quantification of moisture contents in iron and manganese ores.

Costa, Geraldo Magela da; Novack, Kátia Monteiro; Elias, Megg Madonyk Cota; Cunha, Camila Cristina Rodrigues Ferreira da

Quantification of moisture contents in iron and manganese ores.

Date

2013

Authors

Costa, Geraldo Magela da

Novack, Kátia Monteiro

Elias, Megg Madonyk Cota

Cunha, Camila Cristina Rodrigues Ferreira da

Abstract

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.

Keywords

Moisture, Water content, Iron ore

Citation

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.