Clays and Clay Minerals, Vol. 54, No. 2, 165-175, 2006.
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Authors
Perrier, Nicolas
Gilkes, Robert J.
Colin, Fabrice
Issue Date
2006
Type
Article
Language
en_US
Keywords
Periodicals , Geology , Goethite , Maghemite , Hematite , Dehydroxylation Acid Dissolution , Lateritic Ore , New Caledonia
Alternative Title
Heating Fe Oxide-Rich Soils Increases the Dissolution Rate Of Metals
Abstract
Evidence for fire affecting the solubility of metals in Fe oxide-rich Oxisols of the Koniambo Massif of New Caledonia is presented. Acid-dissolution studies showed that Ni, Al and Cr are substituted for Fe in the structure of the Fe oxides. Thermal dehydroxylation of goethite under oxidizing conditions led to the formation of hematite and to the migration of some of these metals towards the surface of hematite crystals as indicated by their enhanced release during the early stage of dissolution. Dehydroxylation of goethite under reducing conditions led to the formation of hematite and maghemite. Nickel and Al were released preferentially during the early stages of dissolution whereas Cr was not released preferentially and may be uniformly incorporated within maghemite and hematite crystals. These results have significance to the mineral-processing industry, to geochemical exploration and to the availability of these metals to plants growing on burnt soils.
Description
gsccm-54-2-03-per.pdf 462KB PDF/A Document
Citation
Clays and Clay Minerals, Vol. 54, No. 2, 165-175, 2006.
Publisher
The Clay Minerals Society
License
Copyright © 2006-2018, The Clay Minerals Society