Quantification of Moisture Contents in Iron and Manganese Ores

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 comp...

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Bibliographic Details
Published in:ISIJ International 2013/10/15, Vol.53(10), pp.1732-1738
Main Authors: costa, Geraldo Magela da, Novack, Kátia Monteiro, Elias, Megg Madonyk Cota, Camila Cristina Rodrigues Ferreira da cunha
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
iron ore
Karl-Fischer titration
manganese ore
Metals. Metallurgy
moisture
thermogravimetric analysis
water content
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Summary: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.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.53.1732