Asbestos waste destruction and valorization method
AssigneesUniversite De Montpellier, Centre National De La Recherche Scientifique, Enscm - Ecole Nationale Superieure De Chimie
InventorsGaël Talbi, Olivier Cambon, Martine Cambon
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Abstract
A method for destructing and valorizing an asbestos waste including the steps of: determining the asbestos mineralogical group contained in the waste, performing a treatment on the waste which includes of: an acid treatment when the waste comprises only a chrysotile, a base treatment when the waste comprises only an amphibole, the acid treatment followed by the base treatment when the asbestos waste includes a mixture of a chrysotile and an amphibole, and valorizing at least one of the products obtained on completion of the performing of the treatment. An embodiment also concerns a treatment of a chrysotile waste through an acid treatment followed by a thermal treatment.
Claims9
A method for destructing and valorizing an asbestos waste, comprising:
- a) determining asbestos mineralogical group(s) contained in said waste, said group comprising a chrysotile and an amphibole,
- b) performing at least one treatment on said asbestos waste, said treatment being:
- an acid treatment when the asbestos waste comprises only a chrysotile, said acid treatment comprising in the immersion of the asbestos waste in a strong acid solution, at a temperature of at most 100° C., so as to obtain an acid solution and a solid comprising a mesoporous silica,
- a base treatment when the asbestos waste comprises only an amphibole, said base treatment consisting in the immersion of the asbestos waste in a solution of a strong base in a hermetically sealed medium so as to obtain a base solution containing dissolved silica,
- said acid treatment followed by said base treatment when the asbestos waste comprises a mixture of a chrysotile and an amphibole, so as to obtain after said acid treatment an acid solution and a solid mixture containing a mesoporous silica and the unaltered amphibole, said solid mixture being separated from the acid solution to be subjected to said base treatment so as to obtain a base solution containing dissolved silica, and
- c) valorizing at least one of the products obtained on completion of step b) of the treatment.
Dependencies are inferred from the claim text.