Journal de Physique IV

J. Phys. IV France 123 (2005) 131-135
DOI: 10.1051/jp4:2005123022

Sintering of kaolin in presence of ferric compound: Study by ultrasonic echography

N.S. Soro¹, P. Blanchart¹, J.P. Bonnet¹, J.M. Gaillard¹, M. Huger¹ and A. Touré²

¹ G.E.M.H. - ENSCI, 47 avenue Albert-Thomas, 87065 Limoges Cedex, France
² Laboratoire de Chimie Minérale, Univ. de Cocody 22, BP. 582, Abidjan 22, Côte d'Ivoire

Abstract
Fine particle of iron compound has been obtain by precipitation of ferric ions in a kaolin suspension. Theses particules located on the kaolinite platelets surface, were transformed into hematite near 300 $^{\circ}$ C during a thermal treatment in air. This hematite located on platelets surface, influences the thermal evolution of kaolinite only after the formation of metakaolin: it did not affect dehydroxylation process, but the structural reorganisation peak were strongly modified.

A study of the densification behaviour of this material by ultrasonic echography had shown that the cristallisation and densification were favours by iron: they began at lower temperature.