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On the Possibility of Removal of Non-Structural Iron from Kaolinite-Group Minerals

Published online by Cambridge University Press:  09 July 2018

K. Bahranowski ,
E. M. Serwlcka ,
L. Stoch  and
P. Strycharski
K. Bahranowski
Affiliation:
Institute of Geology and Mineral Deposits, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Krakow
E. M. Serwlcka
Affiliation:
Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek, 30-239 Krakow
L. Stoch
Affiliation:
Interbranch Institute of Building and Refractory Materials, Academy of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Krakow, and
P. Strycharski
Affiliation:
Faculty of Chemistry, Jagiellonian University, ul. Krupnicza 3, 30-063 Krakow, Poland
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Abstract

The efficiency of removal of the free iron from kaolinite-group minerals by means of acid leaching was followed by chemical, AES, XRD and ESR analyses. Structural Fe responsible for the g = 4 ESR signal represented only a small fraction of Fe impurity in the natural samples. The remaining non-structural Fe was found to exist both as forms easily extractable with acid, as well as deposits that were moderately resistant to the acid treatment. At least part of the latter could be associated with the broad g ~- 2 ESR signal typical of clustered Fe 3+ ions, which in most samples persisted even after prolonged acid leaching. The data demonstrate that procedures commonly used to clean kaolinite of free iron are by no means 100% efficient. In particular, frequently encountered quantitative association of the Fe remaining in the deferrated solids with purely structural Fe, homogeneously distributed in the kaolinite matrix, is probably significantly overestimated and should be treated with great caution.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 3 , September 1993 , pp. 379 - 391
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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