Finding nanotubular halloysite at Lang Dong kaolin deposit, Phu Tho province

Abstract

Halloysite obtained from Lang Dong kaolin deposit, Phu Tho province was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). XRD analysis showed that halloysite (10 Ǻ and 7Ǻ basal spacing) and kaolinite coexist in sample of size fractions <2 mm. SEM and TEM analyses showed that the halloysite has hollow nanotube structures with typical outer diameter of 0.08÷0.30 mm and length of 0.60÷6.00 mm. The mean outer diameter and length are 0.17 and 2.48 mm, respectively. Semi-quantitative analysis using scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS) showed that the sample consists mainly of Al₂O₃ and SiO₂. Result of formamide (FA) treatment showed that under size fraction <2 mm 50 wt% of the sample was taken by halloysite. The study elucidates the characteristics of mineral components, allowing for more efficient use of this resource.

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