Mineral structure and crystal morphologies of high-iron hydrargillite

Hui-bin Yang; Feng-qin Liu; Xiao-lin Pan

doi:10.1007/s12613-018-1597-4

Volume 25 Issue 5

May 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(5): 505-514

Hui-bin Yang, Feng-qin Liu, and Xiao-lin Pan, Mineral structure and crystal morphologies of high-iron hydrargillite, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 505-514. https://doi.org/10.1007/s12613-018-1597-4

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Hui-bin Yang, Feng-qin Liu, and Xiao-lin Pan, Mineral structure and crystal morphologies of high-iron hydrargillite, Int. J. Miner. Metall. Mater., 25(2018), No. 5, pp. 505-514. https://doi.org/10.1007/s12613-018-1597-4

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Research Article

Mineral structure and crystal morphologies of high-iron hydrargillite

+ Author Affiliations

Corresponding author:
Feng-qin Liu E-mail: liufq@ustb.edu.cn
Received: 24 October 2017; Revised: 27 December 2017; Accepted: 10 January 2018

Abstract

Abstract

Various characterization methods, including scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer–Emmett–Teller surface-area measurements, thermogravimetry–differential scanning calorimetry, X-ray diffraction, and infrared spectroscopy, were used to study the mineral structure and surface characteristics of high-iron hydrargillite. Gibbsite, goethite, and hematite were found to be the main mineral components of hydrargillite, whereas the goethite and hematite were closely clad to the surface of the multilayer gibbsite crystals. Compared with the synthetic gibbsite, the hydrargillite contained more structural micropores generated by the mineral evolution during the mineralization process. The gibbsite in hydrargillite contained less crystal water compared with the synthetic gibbsite, and it was a typical polymorphic structure. The isomorphous substitution of Al and Fe was observed in goethite. The dissolution-controlling step of hydrargillite was the ionic diffusion speed because of the goethite and hematite that closely covered and encapsulated the gibbsite crystals.
- hydrargillite;
- goethite;
- gibbsite;
- mineral structure;
- crystal morphologies

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