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Influence of grinding on the structure and colour properties of talc, bentonite and calcite white fillers

Published online by Cambridge University Press:  09 July 2018

G. E. Christidis ,
P. Makri  and
V. Perdikatsis
G. E. Christidis*
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73100 Chania, Greece
P. Makri
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73100 Chania, Greece
V. Perdikatsis
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73100 Chania, Greece
*
*E-mail: christid@mred.tuc.gr
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Abstract

The influence of grinding on colour and particle-size properties of talc and smectite from a white bentonite were studied and compared with a fine-grained calcite from a chalk. Grinding decreased the grain size of all three minerals. The crystallite size and structure of smectite was not affected but the crystallite size of talc decreased. The Si–O–Mg and Mg–O bonds of talc were disrupted and cation exchange capacity increased with increasing grinding. Delamination of talc crystallites was observed in the initial stages of grinding, whereas with more intense treatment, amorphous material was formed. Comminution improved the colour properties of all three minerals, namely brightness, L* (lightness) and ΔE*ab (deviation from perfect white diffuser). Grinding time exerts greater influence on the reflectance from calcite surfaces than from clay minerals. This difference is attributed to continuous formation of progressively smaller diffuse reflection units forming a smoother calcite surface. Decrease of grain size does not form considerably smaller diffuse reflection units in clay minerals unless delamination takes place. With prolonged grinding, amorphization forms additional diffuse reflection units and a smoother surface due to comminution.

Keywords

talcbentonitecalcitegrindingcrystallite sizediffuse reflection unit
Type
Research Article
Information
Clay Minerals , Volume 39 , Issue 2 , June 2004 , pp. 163 - 175
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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