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Properties and Acid Dissolution of Metal-Substituted Hematites

Published online by Cambridge University Press:  28 February 2024

M. A. Wells ,
R. J. Gilkes  and
R. W. Fitzpatrick
M. A. Wells*
Affiliation:
CSIRO Exploration and Mining, Wembley, Perth, Western Australia 6913, Australia
R. J. Gilkes
Affiliation:
Department of Soil Science and Plant Nutrition, University of Western Australia, Perth, Western Australia 6907, Australia
R. W. Fitzpatrick
Affiliation:
CSIRO, Land and Water, Glen Osmond, Adelaide, South Australia, 5064, Australia
*
E-mail of corresponding author: m.wells@per.dem.csiro.au
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Abstract

The dissolution in 1 M HC1 of Al-, Mn-, and Ni-substituted hematites and the influence of metal substitution on dissolution rate and kinetics of dissolution were investigated. The inhomogeneous dissolution of most of the hematites investigated was well described by the Avrami-Erofe'ev rate equation, kt = √[-ln(l − α)], where k is the dissolution rate in time, t, and α is the Fe dissolved. Dissolution of Al-substituted hematite occurred mostly by edge attack and hole formation normal to (001), with the rate of dissolution, k, directly related to surface area (SA). Dissolution of rhombohedral Mn- and Ni-bearing hematites occurred at domain boundaries, crystal edges, and corners with k unrelated to SA. The morphology of Mn- and Ni-substituted hematites changed during dissolution with clover-leaf-like forms developing as dissolution proceeded, whereas the original plate-like morphology of Al-bearing hematite was generally retained. Acid attack of platy and rhomboidal hematite is influenced by the direct (e.g., metaloxygen bond energy, hematite crystallinity) and indirect (e.g., crystal size and shape) affects associated with incorporation of foreign ions within hematite.

Keywords

Acid DissolutionActivation EnergyFrequency FactorHematiteIron OxideMetal Substitution
Type
Research Article
Information
Clays and Clay Minerals , Volume 49 , Issue 1 , February 2001 , pp. 60 - 72
Copyright
Copyright © 2001, The Clay Minerals Society

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