Multi-phase calcium silicate hydrates, methods for their...

C - Chemistry – Metallurgy – 04 – B

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C04B 7/34 (2006.01) C04B 33/24 (2006.01) D21H 21/28 (2006.01) D21H 17/68 (2006.01) D21H 19/40 (2006.01) D21H 19/54 (2006.01)

Patent

CA 2382869

A method for the hydrothermal preparation of calcium silicate hydrates. Multi- phase calcium silicate hydrates, having unique physical and chemical properties, are prepared by hydrothermal reaction of specified ratios of CaO and SiO2, normally starting from slurries of slaked lime and from fluxed calcined diatomaceous earth, each of which is at about the atmospheric boiling point before being mixed and charged to a reactor, and pressurized. The hydrothermal reaction is carried out while maintaining the initial dilution for a preselected reaction time at a preselected reaction temperature. The calcium silicate hydrates produced have high water absorption and light scattering power, and have optical and physical properties making them highly desirable as a filler substitute in papermaking.

L'invention concerne un procédé de préparation d'hydrates de silicate de calcium. Les hydrates de silicate de calcium à phases multiples, qui présentent des propriétés physiques et chimiques uniques, sont préparés par réaction hydrothermique de rapports spécifiques de CaO et SiO2, normalement à partir de boues de chaux éteinte et de terre à diatomées calcinée et fluidifiée, chacune environ au point d'ébullition atmosphérique avant d'être mélangée et chargée dans un réacteur, puis mis sous pression. La réaction hydrothermique est effectuée, la dilution initiale étant maintenue pour un temps et à une température de réaction présélectionnées. Les hydrates de silicate de calcium produits ont un pouvoir élevé d'absorption et de diffusion de la lumière. Leurs propriétés optiques et physiques sont très recherchées comme charge de remplacement dans la fabrication de papier.

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