Article ID Journal Published Year Pages File Type
235807 Powder Technology 2015 10 Pages PDF
Abstract

•Ball milling efficient to achieve amorphous kaolinite structure•Nanocrystalline quartz preserved during processing•XRD, DSC, infra-red spectroscopy and DTG quantifys major structural changes•Ball milling is an alternative to avoid calcination process

Planetary ball mill is used to process kaolinite clay powder under a commercial name of proclay kaolinite. Influence of milling time on structure and thermal behavior of proclay kaolinite are presented and discussed. X-ray powder diffraction shows that peak intensities, at kaolinite characteristic positions, decrease gradually and decay after 3 hours of milling. Amorphous structure of kaolinite forms with a nanocrystalline quartz. The mean crystallite size of nanocrystalline quartz is found to decrease from D = 30 ± 2 nm for unmilled powder to D = 7 ± 1.5 nm after 9 hours of processing. For the same time shift, thermal analysis shows that specific heat capacity of unmilled powder increases from 0.93 J/g.K to 1.65 J/g.K for milled powder.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
Authors
, , , , ,