Centre National De La Recherche Scientifique

Luzenac Europe Sas

Imerys Talc Europe

Cedric Lebre

Francois Martin

Jean-Pierre Bonino

Jocelyne Ferret

Didier Arseguel

Eric Ferrage

Sabine Petit

Olivier Grauby

Alain Decarreau

Pierre Micoud

The invention relates to a method for preparing a composition, that is a talcose composition, comprising synthetic mineral particles which contain silicon, germanium and metal, have a crystalline and lamellar structure, and are of formula (SiGe)MO(OH), wherein M is at least one divalent metal and is of formula MgCOZnCuMnFeNiCr, and x is a real number of the interval [0; 1]. According to said method, a gel containing silicon, germanium and metal, of formula &#x2014;(SiGe)MO, n'HO&#x2014;, in the liquid state, is subjected to a hydrothermal treatment over a defined period of time and at a temperature of between 300&#xb0; C. and 600&#xb0; C., said time and temperature being selected according to the desired particle size and structural stability for the mineral particles containing silicon, germanium and metal, to be prepared.

Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal

The invention relates to a method for preparing a synthetic talc composition. According to said method, a kerolite composition is subjected to an anhydrous thermal treatment carried out at a pressure lower than 5 bar, from over a few hours up to over a few days, at a treatment temperature higher than 300&#xb0; C. The invention also relates to a synthetic talc composition prepared in this way, the synthetic talc particles of the composition being exclusively of chemical formula &#x2014;(Si)MgO(OH)&#x2014; and identifiable, during X-ray diffraction, by the presence of a characteristic diffraction peak located at a distance of between 9.40-9.68 and corresponding to a plane (001). Said synthetic talc particles also have a thermally stable crystalline structure of stacked laminae, which is very similar to that of a natural talc and has a particle size smaller than approximately ten micrometers.

Method for preparing a synthetic talc composition from a kerolite composition

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Toulouse, France

Cedric Lebre