A process for the production of reactive blast furnace slag

C - Chemistry – Metallurgy – 04 – B

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C04B 18/14 (2006.01) C04B 18/04 (2006.01)

Patent

CA 2645348

The invention particularly relates to a process for increasing the reactivity of ground granulated blast furnace slag using surface activation through short mechanical activation time (10-60 min) and it starts to hydrate in short time (48 h or less) when mixed with water without any chemical additive and completely hydrates in maximum 28 days forming cementitious product. The products produced by the process of present invention may be of different particle sizes and shapes, different specific surface areas, different surface charge (Zeta potential) and different reactivity. The reactive blast furnace slag shall be useful in Portland Slag Cement (PSC), Geopolymer, immobilisation and stabilisation of toxic wastes and newer nano-composite materials.

L'invention concerne en particulier un processus permettant d'augmenter la réactivité de laitier de haut fourneau granulé concassé par activation de surface avec un court temps d'activation mécanique (10-60 minutes). L'hydratation commence rapidement (48 heures voire moins) une fois qu'il est mélangé à de l'eau sans aucun additif chimique et se termine au maximum en 28 jours pour obtenir un produit de cimentation. Les produits obtenus grâce au processus de la présente invention peuvent être de tailles et de formes particulaires différentes, de superficies spécifiques différentes, de charges superficielles différentes (potentiel Zêta) et de réactivités différentes. Le laitier de haut fourneau réactif servira dans le ciment de laitier de Portland (PSC), le géopolymère, l'immobilisation et la stabilisation de déchets toxiques et des matériaux nano-composites récents.

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