Process for the production of porous, permeable mineral...

Details Process for the production of porous, permeable mineral... Process for the production of porous, permeable mineral...

C - Chemistry, Metallurgy

04

B

117/88.5

C04B 41/87 (2006.01) B01D 71/02 (2006.01) C04B 38/00 (2006.01) C04B 41/50 (2006.01)

Patent

CA 1264994

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the production of porous, permeable, mineral membranes. According to this process, on a porous, permeable substrate is formed a thin layer of at least one mineral compound chosen from among the simple or mixed metal oxides, except aluminium oxide and mixed aluminium oxides, simple or mixed metal hydroxides, except aluminium hydroxide and mixed aluminium hydroxides and mixtures thereof on the basis of a suspension in a liquid of colloidal or non-colloidal particles, said compound or a precursor thereof having particle sized below 10 µm, the thus obtained membrane being dried and then annealed at between 400 and 1100°C. The use of a suspension of ultrafine colloidal or non-colloidal particles makes it possible to obviate the compression stage and obtain microporous layers with very small pore radii.

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