Purification of Dunino halloysite by H2SO4 leaching and magnetic separation
1 Division of Nanocrystalline and Functional Materials and Sustainable Proecological Technologies Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Konarskiego 18a, C44-100 Gliwice, Poland
2 Institute of Mining, Faculty of Mining and Geology, Silesian University of Technology, Akademicka 2, C44-100 Gliwice, Poland
a Corresponding author: Marcin.Lutynski@polsl.pl
The article presents results of purification and comminution of raw halloysite from the Dunino deposit. The aim of the study was to clean halloysite from Dunino deposit with acid (H2SO4) leaching and to remove iron impurities in order to obtain fine grained fractions smaller than 20 μm, which can be used in future for manufacturing polymer-aluminosilicate composites. The proposed method, where nanotubes (HNT) and nanoplates (HNP) were separated, consisted of several simple stages including crushing, milling magnetic separation and sedimentation. A multi-stage process resulted in three products: heavy iron oxide fraction, HNP and HNT mixture (<20 um) and remaining intermediate product (mostly iron, titanium oxides and aluminosilicates >20μm).
© Owned by the authors, published by EDP Sciences, 2016
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