Structural alteration of sepiolite by dry grinding

作者：J. Cornejo, M.C. Hermosı́n · 发表于：Clay Minerals · 年份：1988 · DOI：10.1180/claymin.1988.023.4.06 · 被引用次数：81 · 研究领域：Clay minerals and soil interactions、Mineralogy and Gemology Studies、Glass properties and applications

Abstract The effects of dry grinding on the structure of sepiolite were studied by XRD, surface area measurement, TG-DTA and IR spectroscopy techniques. The results show that the sepiolite framework is rather resistant to mechanical stress and its alteration by dry grinding occurs through three successive, overlapping processes: (i) thinning of the fibrous particles without structural alteration; (ii) distortion of the parallel units of sepiolite fibres, affecting essentially the particle surface which transforms into an amorphous protective coating; (iii) disruption of the inner structure and a prototropy effect, producing an amorphous phase with some residual order.