Hazardous waste disposal method and composition

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 18/00 (2006.01) B09B 3/00 (2006.01) C04B 18/04 (2006.01) C04B 28/00 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2081214

A method of immobilizing a hazardous waste is provided. The method comprises providing a dry cementitious composi- tion capable of hardening and in the form of finely divided particles of at least one cement binder, placing an amount of the dry cementitious composition into the hazardous waste with or without an additional added volume of water, without any type of physical mixing of the cementitious composition and water other than the mixing which occurs merely by applying the cementi- tious composition into the water. The major portion of the particles of the cementitious composition have approximately the same drop rate through the volume of water. The water contacts the dry cementitious composition when poured into the volume of wa- ter to hydrate the particles of the dry cementitious composition, the particles of cementitious composition dropping through the water to displace excess water and form the hydrated cementitious composition particles in a substantially non-segregated mass. The hydrated cementitious composition is then allowed to set and cure to a solid mass. The set time may vary from less than a few seconds to many hours and even days to immobilize the hazardous waste. The cementitious composition may have a neutralizer for the hazardous waste.

éthode d'immobilisation des déchets dangereux. Comprend, d'une part, la préparation d'une composition cimentaire sèche capable de durcir, formée de fines particules d'au moins un liant de ciment, et, d'autre part, l'utilisation d'une certaine quantité de cette composition dans les déchets dangereux avec ou sans l'ajout d'un volume d'eau, et sans avoir à intervenir en aucune façon pour mélanger la composition cimentaire et l'eau, le mélange se faisant par simple contact. La plus grande partie des particules de la composition cimentaire ont à peu près la même vitesse de chute dans l'eau. L'eau entre en contact avec la composition cimentaire sèche lorsque celle-ci est versée dans le volume d'eau et vient ainsi hydrater les particules de la composition cimentaire sèche qui s'enfoncent dans l'eau en chassant l'excès d'eau pour former une masse essentiellement homogène. On laisse ensuite la composition cimentaire hydratée figer et durcir en une masse solide. Le temps nécessaire à l'immobilisation complète des déchets dangereux peut varier d'à peine quelques secondes à plusieurs heures et même plusieurs jours. La composition cimentaire peut comporter un agent de neutralisation des déchets dangereux.

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