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Effect of Time and Temperature on the Chemical Composition and Crystallization of Mixed Iron and Aluminum Species

Published online by Cambridge University Press:  28 February 2024

C. Colombo  and
A. Violante
C. Colombo
Affiliation:
Dipartimento di Scienze Chimico-Agrarie, Università di Napoli “Federico II,” 80055 Portici, Napoli, Italy
A. Violante
Affiliation:
Dipartimento di Scienze Chimico-Agrarie, Università di Napoli “Federico II,” 80055 Portici, Napoli, Italy
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Abstract

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We studied the influence of time ageing (up to 120 d at 50°C or 30d at 95°C) on the mineralogical and chemical composition of hydrolytic species of mixed aluminum and iron samples formed at pH 5.0 and initial Fe/Al molar ratio (Ri) ranging from 0.1 to 10. The partitioning distribution of Fe and Al in soluble or solid phases of different sizes (<0.01, 0.2–0.01, >0.2 μm) depended on Ri and time. The ratio of Fe to Al of the <0.2 μm Fe-Al species of the samples at Ri ≤ 4 slowly increased with time. Usually the higher Ri the higher the amount of Fe + Al present in soluble or very fine solids (<0.2 μm). With time, high percentages of Fe were found mainly in the <0.01 μm while the Al increase in the >0.2 μm sizes. Gibbsite, without the presence of well-crystallized Fe-oxides was formed in the samples at Ri ≤ 0.5 after 7–120 d at 50°C. In the samples at Ri ≥ 1 low-crystalline ferrihydrite was observed after ≥60 d. Only after 120 d did gibbsite or hematite start to form in the samples at Ri = 1–10. However, even after prolonged ageing at 95°C, low-crystalline ferrihydrite was still present at Ri ≤ 4.

The Fe-Al samples at Ri ≥ 1 aged 32 d at 50°C dissolved almost completely by acid ammonium-oxalate (82–93%), but the samples at Ri ≤ 0.5 were only partially solubilized (13–60%). After further 30 d at 95°C, the percentages of Fe + Al solubilized by oxalate from the samples at R ≥ 0.5 was still relatively high (22–39%).

Keywords

AluminumCrystallizationGibbsiteIron
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 1 , February 1996 , pp. 113 - 120
Copyright
Copyright © 1996, The Clay Minerals Society

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