Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-28T14:51:33.087Z Has data issue: false hasContentIssue false
  • English
  • Français

Acid dissolution of synthetic aluminous goethite before and after transformation to hematite by heating

Published online by Cambridge University Press:  09 July 2018

H. D. Ruan  and
R. J. Gilkes
H. D. Ruan
Affiliation:
Soil Science and Plant Nutrition, Faculty of Agriculture, The University of Western Australia, Nedlands, WA 6009, Australia
R. J. Gilkes
Affiliation:
Soil Science and Plant Nutrition, Faculty of Agriculture, The University of Western Australia, Nedlands, WA 6009, Australia
Get access Rights & Permissions [Opens in a new window]

Abstract

Measurements of the kinetics of acid dissolution of synthetic aluminous goethites and corresponding hematites produced by heating of parent Al-goethites at various temperatures were carried out in 1 M HC1 at 30, 40 and 50°C. Dissolution-time curves show sigmoidal shapes for the goethites (110°C), whereas deceleratory shapes were obtained for most of the partly and fully dehydroxylated samples. The dissolution rate for all materials decreased with increasing Al substitution and increased with increasing dissolution temperature, specific surface area and heating temperature. On a unit surface area basis, hematite dissolved ∼ 2–8 times faster than goethite. Dissolution kinetics of most heated goethite samples (200–260°C) were quite well described (R2 > 0.96) by the modified first-order Kabai equation. The activation energy and frequency factor for dissolution increased with increasing Al substitution.

Type
Research Article
Information
Clay Minerals , Volume 30 , Issue 1 , March 1995 , pp. 55 - 65
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Cornell, R.M. & Giovanoli, R. (1993) Acid dissolution of hematites of different morphologies. Clay Miner. 28, 223–232.Google Scholar
Cornell, R.M., Posner, A.M. & Quirk, J.P. (1974) Crystal morphology and the dissolution of goethite. J. Inorg. Nucl. Chem. 36, 1937–1946.Google Scholar
Cornell, R.M., Posner, A.M. & Quirk, J.P. (1975) Complete dissolution of goethite. J. Appl. Chem. Biotech. 25, 701–706.Google Scholar
Cornell, R.M., Posner, A.M. & Quirk, J.P. (1976) Kinetics and mechanisms of the acid dissolution of goethite (et-FeOOH). J. Inorg. Nucl. Chem. 38, 563–567.Google Scholar
Fev, M.B. & Dixon, J.B. (1981) Synthesis and properties of poorly crystalline hydrated aluminous goethites. Clays Clay Miner. 29, 91–100.Google Scholar
Gastuche, M.C., Delman, B. & Vielvoye, L. (1960) La cinétique des réactions hétérrogénes, ataque duréseau silico-aluminique des kaolinites par l'acide chlorohydrique. Bull. Soc. Chem. France. 60–70.Google Scholar
Goodman, B.A. & Lewis, D.G. (1981) Mössbauer spectra of aluminous goethite (α-FeOOH), J. Soil Sci. 32, 351–363.Google Scholar
Goss, C.J. (1987) The kinetics and reaction mechanism of the goethite to hematite transformation. Mineral. Mag. 51, 437–451.CrossRefGoogle Scholar
Greenberg, A.S. (1961) Reaction between silica and calcium hydroxide solutions. I. Kinetics in the temperature range 30 to 85° . J. Phys. Chem. 65, 12–16.Google Scholar
Kabai, J. (1973) Determination of specific activation energies of metal oxides and metal oxide hydrates by measurement of the rate of dissolution. Acta Chem. Acad. Sci. Hung. 78, 57–73.Google Scholar
Lewis, D.G. & Schwertmann, U. (1979) The influence of A1 on iron oxides. III. Preparation of Al-goethite in N KOH. Clay Miner. 14, 115–126.Google Scholar
Lim-Nunez, R.S.L (1985) Synthesis and acid dissolution of metal-substituted goethites and hematites. MSc thesis, Univ. Western Australia.Google Scholar
Lim-Nunez, R.S.L & Gilkes, R.J. (1987) Acid dissolution of synthetic metal-containing goethites and hematite. Proc. Int. Clay Conf. Denver, 197–204.Google Scholar
Mckeague, J.A. & Day, J.H. (1966) Dithionite- and oxalate-extractable Fe and A1 as aids in differentiat-ing various classes of soils. Can. J. Soil Sci. 46, 13–22.CrossRefGoogle Scholar
Naono, H. & Fujiwara, R. (1980) Micropore formation due to decomposition of acicular microcrystals of t∼-FeOOH. J. Colloid Interface Sci. 73, 404–415.CrossRefGoogle Scholar
Novak, G.A. & Colville, A.A. (1989) A practical interactive least-squares cell-parameter program using an electronic spreadsheet and a personal computer. Am. Miner. 74, 488—490.Google Scholar
Ruan, H.D. & Gilkes, R.J. (1995) Dehydroxylation of aluminous goethite: unit cell dimensions, crystal size and surface area. Clays Clay Miner. 43 (in press).Google Scholar
Schulze, D.G. (1984) The influence of aluminum on iron oxides. VIII. Unit-cell dimensions of Al-substituted goethites and estimation of A1 from them. Clays Clay Miner. 32, 36–44.Google Scholar
Schwertmann, U. (1984) The influence of aluminium on iron oxides: IX. Dissolution of Al-goethites in 6 M HC1. Clay Miner. 19, 9–19.Google Scholar
Schwertmann, U. (1991) Solubility and dissolution of iron oxides. Plant Soil 130, 1–25.Google Scholar
Schwertmann, U. & Latham, M. (1986) Properties of iron oxides in some New Caledonian oxisols. Geoderma39, 105–123.Google Scholar
Schwertmann, U., Cambier, P. & Murad, E. (1985) Properties of goethites of varying crystallinity. Clays Clay Miner. 33, 369–378 Google Scholar
Sidhu, P.S., Gilkes, R.J., Cornell, R.M., Posner, A.M & Quirk, J.P. (1981) Dissolution of iron oxides and oxyhydroxides in hydrochloric and perchloric acids. Clays Clay Miner. 29, 269–276.Google Scholar
Singh, B. & Gilkes, R.J (1991) Properties and distribution of iron oxides and their association with minor elements in the soils of south-western Australia. J. Soil Sci. 43, 77–98.Google Scholar
Singh, B. & Gilkes, R.J. (1992) XPAS: An interactive computer program for analysis of X-ray powder diffraction patterns. Powder Diffraction 7, 6—10.Google Scholar
Stanjek, H. & Schwertmann, U. (1992) The influence of aluminum on iron oxides. Part XVI: Hydroxyl and aluminium substitution in synthetic hematites. Clays Clay Miner. 40, 347–357.Google Scholar
Watari, F., Delavignette, P., Van Landuyt, J. & Amelinckx, S. (1983) Electron microscopic study of dehydration transformations III. High resolution observation of the reaction process FeOOH → Fe203 . J. Solid State Chem. 48, 49–64.Google Scholar
Watari, E., Van Landuyt, J., Delavignette, P. & Amelinckx, S. (1979) Electron microscopic study of dehydration transformations I. Twin formation and mosaic structure in hematite derived from goethite. J. Solid State Chem. 29, 137–150.Google Scholar