Improved method and products for treating asbestos

Details Improved method and products for treating asbestos Improved method and products for treating asbestos

A - Human Necessities

62

D

A62D 3/36 (2007.01) C01B 33/26 (2006.01) C04B 14/40 (2006.01) C04B 41/46 (2006.01)

Patent

CA 2060500

A method for rendering harmless chrysotile asbestos comprises wetting the asbestos fibers with an aqueous solution containing about 1 to 25 % by weight of a weak organic acid, such as trifluoroacetic acid. Optionally, the aqueous solution further comprises about 1 to 10 % by weight of a source of fluoride ions, such as ammonium fluoride. The weak acid solution hydrolyzes the magnesium oxide units in asbestos while the fluoride ions attack the interleaved silica layers in the crystal structure of asbestos, thereby destroying the fibrous nature of the asbestos.

Selon un procédé utile pour rendre inoffensive la serpentine fibreuse, on humidifie les fibres d'amiante avec une solution aqueuse contenant entre 1 et 25 % en poids d'un faible acide organique, tel que l'acide trifluoroacétique. Facultativement, la solution aqueuse contient en outre entre 1 et 10 % en poids d'une source d'ions fluorure, telle que le fluorure d'ammonium. La faible solution acide hydrolyse les unités d'oxyde de magnésium dans l'amiante alors que les ions de fluorure attaquent les couches intercalées de silice dans la structure cristalline de l'amiante, détruisant la nature fibreuse de l'amiante.

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