Influence of the chemical composition and textural characteristics of palygorskite on the acid leaching of octahedral cations
- 1 June 1987
- journal article
- Published by Mineralogical Society in Clay Minerals
- Vol. 22 (2) , 225-232
- https://doi.org/10.1180/claymin.1987.022.2.10
Abstract
Leaching of two palygorskites with different octahedral aluminium contents has been carried out in HCl at 20°–70°C. The acid concentration was varied in the range 0·05–6 mol. 1−1, using 4–500 g.g−1 liquid to solid ratios. Acid leaching of up to 60% of the octahedral cations did not provoke structural changes or amorphization of the samples. On the bases of the selectivity of extraction of Mg2+, Fe3+ and Al3+, it appeared that most of the octahedral edge positions are occupied by Mg2+, some by Fe3+, and practically none by Al3+. Differences in acid-leaching behaviour between the two palygorskites was better related to accessible surface than chemical composition.Keywords
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