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Effects of dry grinding on two kaolins of different degrees of crystallinity

Published online by Cambridge University Press:  09 July 2018

F. Gonzalez Garcia ,
M. T. Ruiz Abrio  and
M. Gonzalez Rodriguez
F. Gonzalez Garcia
Affiliation:
Departmento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Profesor García González s/n Apdo. 533, E-41071 Sevilla, Spain
M. T. Ruiz Abrio
Affiliation:
Departmento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Profesor García González s/n Apdo. 533, E-41071 Sevilla, Spain
M. Gonzalez Rodriguez
Affiliation:
Departmento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Profesor García González s/n Apdo. 533, E-41071 Sevilla, Spain
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Abstract

Grain-size distribution, specific surface, thermal analysis, electron microscopy and X-ray diffraction were used to study the effect of dry grinding on the structure and properties of two kaolins of different degree of crystallinity. Grinding caused particles to fragment and resulted in the formation of stable large spheroidal aggregates of fine particles. These two processes were not clearly separated by a specific grinding time, but occurred in parallel shortly after grinding was started, although aggregate formation persisted at longer grinding times. The variation in the specific surface area during grinding was found to be dependent on these two processes and on the particle size and crystallinity of the initial kaolin. DTA and XRD data and the amount of water released at different temperatures revealed grinding to gradually destroy the kaolinite structure and cause the loss of hydroxyl ions and the formation of others that were subsequently removed at low and medium temperatures. An explanation for the process whereby the new hydroxyl ions are formed is provided.

Type
Research Article
Information
Clay Minerals , Volume 26 , Issue 4 , December 1991 , pp. 549 - 565
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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