Acid treatment, at low temperature and pressure, of a waste...

B - Operations – Transporting – 09 – B

Patent

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Details

B09B 3/00 (2006.01) C04B 18/04 (2006.01)

Patent

CA 2722779

The present invention relates to a process for treating a waste containing asbestos, comprising a step (E) in which the asbestos contained in said waste is dissolved by reacting this waste with an acid other than hydrofluoric acid, preferably with hydrochloric acid, at a temperature of at least 125°C and at a pressure greater than 0.2 MPa (2 bar), and in which: the asbestos included in the treated waste is an asbestos of amphibole type; and/or the solution obtained at the end of the acid dissolution of the asbestos is reused, for example for the synthesis of apatites.

La présente invention concerne un procédé de traitement d'un déchet contenant de l'amiante, comprenant une étape (E) dans laquelle on dissout l'amiante contenue dans ledit déchet en faisant réagir ce déchet avec un acide autre que l'acide fluorhydrique, préférentiellement avec de l'acide chlorhydrique, à une température d'au moins 125 °C et à une pression supérieure à 0,2 MPa (2 bars), et dans lequel : l'amiante comprise dans le déchet traité est une amiante de type amphibole; et/ou la solution obtenue à l'issue de la dissolution acide de l'amiante est valorisée, par exemple pour la synthèse d'apatites.

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