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Effect of Kaolinite and Sulfate on the Formation of Hydroxy-Aluminum Compounds

Published online by Cambridge University Press:  28 February 2024

M. Teresa Garcia-Gonzalez ,
Carmen Vizcayno  and
Javier Cortabitarte
M. Teresa Garcia-Gonzalez
Affiliation:
Departamento de Geoquímica y Mineralogía, Centro de Ciencias Medioambientales, CSIC, Serrano 115, 28006 Madrid, Spain
Carmen Vizcayno
Affiliation:
Departamento de Geoquímica y Mineralogía, Centro de Ciencias Medioambientales, CSIC, Serrano 115, 28006 Madrid, Spain
Javier Cortabitarte
Affiliation:
Departamento de Geoquímica y Mineralogía, Centro de Ciencias Medioambientales, CSIC, Serrano 115, 28006 Madrid, Spain
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Abstract

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OH-A1 solutions were prepared by adding appropriate amounts of NaOH to A1C13 to obtain OH/Al mole ratios of 2.0, 2.5, 2.7, 3.0, and 3.3 in the final suspension. Solid Na2SO4 and Georgia kaolinite (KGa-2) were added individually and jointly to the OH-Al solutions. All samples were aged for 30, 70, and 180 d. X-ray diffraction, infrared spectroscopy, scanning electron microscopy, and energy dispersive X-ray spectrometry were used to characterize precipitates. Bayerite, gibbsite, and nordstrandite crystallized at mole ratios of 3.0 and 3.3, with bayerite being the most abundant. A morphology of clusters of triangular pyramids is described for bayerite. Despite the aging duration, only noncrystalline Al compounds were obtained in mole ratios of 2.0, 2.5, or 2.7. The addition of sulfate to OH-A1 solutions in mole ratios of 2.0 and 2.5 produced crystalline basic aluminum sulfates of variable morphology, but with similar chemical compositions. These phases lost crystallinity with aging. The product from a 2.7 OH-Al solution was X-ray amorphous hydroxysulfate. In contrast, products obtained at mole ratios of 3.0 and 3.3 contained no sulfate ion, which restricted the formation of gibbsite, bayerite, and nordstrandite. The addition of kaolinite to the solutions in OH/A1 mole ratios of 3.0 and 3.3 favored the formation of nordstrandite. The simultaneous addition of sulfate and kaolinite to the OH-A1 solutions in mole ratios of 2.0 and 2.5 produced prevalent sulfate over kaolinite, whereas the opposite occurred at mole ratios 3.0 and 3.3.

Keywords

BayeriteCMS Clay KGa-2GibbsiteHydroxysulfateNoncrystalline CompoundsNordstrandite
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 85 - 94
Copyright
Copyright © 2000, The Clay Minerals Society

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