Method for treating asbestos

Details Method for treating asbestos Method for treating asbestos

1993-11-22

1996-05-14

Straub, Gary P.

Hazardous or toxic waste destruction or containment

Containment

588254, 588901, 4231671, 423335, 423659, A62D 300, A61L 1100, B09B 300

Patent

active

055169732

ABSTRACT:
A method for rendering asbestos in an asbestos-containing material harmless comprises wetting the material with an aqueous solution containing about 1 to 25% by weight of an organic acid, such as trifluoroacetic acid and at least 1% by weight of a source of fluoride ions, such as ammonium fluoride. The acid hydrolyses 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. Wetting with the solutions also facilitates the removal of asbestos-containing material from the substrate on which it is installed.

REFERENCES:
patent: 2403370 (1946-06-01), Chalmers
patent: 3708014 (1973-01-01), Wally
patent: 4058587 (1977-11-01), Nelson
patent: 5041277 (1991-08-01), Mirick
patent: 5258131 (1993-11-01), Mirick et al.
patent: 5258562 (1993-11-01), Mirick et al.
patent: 5264655 (1993-11-01), Mirick et al.
"Asbestos", vol. 1, John Wiley & Sons, Edited by J. Michaels, pp. 82-86 (1979).
Abstract of Japanese Patent No. 70 020170 assigned to Japan Asbestos Co. Ltd.

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