Process for the preparation, preferably from waste...

Details Process for the preparation, preferably from waste... Process for the preparation, preferably from waste...

C - Chemistry, Metallurgy

03

C

261/2

C03C 11/00 (2006.01) B09B 3/00 (2006.01) B32B 3/00 (2006.01) B32B 3/26 (2006.01) C03B 19/08 (2006.01) C04B 20/06 (2006.01) C04B 20/10 (2006.01) C04B 38/10 (2006.01)

Patent

CA 2318240

The process of the invention characterised in that to 100 parts by weight of a silicate powder having 2000-8000 m2/g specific surface; 1-10 parts by weight of gas-forming material with particle size of 10-100 pm and 0.5-15 parts by weight of montmorillonite, 0.5-2 parts by weight of alkali hydrogen phosphate or alkali dihydrogen phosphate or a mixture of alkali metal phosphate and sodium silicate in form of aqueous solution, 0.01-5 parts by weight of rare earth metal oxide or a mixture of such oxides were added, then the mixture obtained is homogenised, pro-dried, coated with 1-5 parts by weight of titanium oxide and/or titanium oxide hydroxide and/or aluminium oxide hydroxide, then subjected to heat treatment at .720-1000°C, and the mixture obtained is moulded. The subject of the invention: also the product of the above process.

Cette invention se caractérise en ce que, à 100 parties en poids d'une poudre de silicate ayant une surface spécifique de 2000 à 8000 m<2>/g, on ajoute 1 à 10 parties en poids d'un matériau gazogène ayant une granulométrie comprise entre 10 et 100 mu m et 0,5 à 15 parties en poids de montmorillonite, 0,5 à 2 parties en poids de phosphate d'hydrogène alcalin ou de phosphate de dihydrogène alcalin ou d'un mélange de phosphate de métal alcalin et de silicate de sodium sous forme de solution aqueuse, 0,01 à 5 parties en poids d'oxyde métallique de terres rares ou d'un mélange de ces oxydes, puis le mélange obtenu est homogénéisé, préséché, enrobé de 1 à 5 parties en poids d'oxyde de titane et/ou hydroxyde d'oxyde de titane et/ou hydroxyde d'oxyde d'aluminium, puis soumis à un traitement thermique à une température comprise entre 720 et 1000 DEG C, et le mélange ainsi obtenu est moulé. Cette invention concerne également le produit issu de ce procédé.

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