C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 18/06 (2006.01) B02C 19/06 (2006.01) B02C 23/16 (2006.01) B07B 7/083 (2006.01) C04B 7/02 (2006.01) C04B 18/08 (2006.01) F23J 1/00 (2006.01)
Patent
CA 2358494
A method for reducing the carbon content of a combustion ash containing siliceous ash particles and carbon particles includes subjecting the combustion ash to comminution to reduce the particle size of the siliceous ash particles and the carbon particles followed by separating a portion of the carbon particles from the siliceous ash particles by subjecting the comminuted ash to a flow of gas which separates the carbon particles from the siliceous ash particles. The method preferably is performed in a unitary housing by employing autogenous grinding to effect the comminution of the particles and employing a classifying rotor to separate the comminuted portion of the carbon particles based on the density differential between the siliceous ash particles and the carbon particles. A method of making a concrete mixture employing the obtained combustion ash with reduced carbon content is also provided. An apparatus for reducing the carbon content of the combustion ash is also provided.
L'invention concerne un procédé permettant de réduire la teneur en carbone de cendres de combustion contenant des particules de cendre siliceuse et des particules de carbone, consistant à soumettre les cendres de combustion à une comminution en vue de réduire la taille des particules de cendre siliceuse et de carbone, puis à séparer une partie des particules de carbone des particules de cendre siliceuse en exposant les cendres fragmentées à un flux gazeux. Ce procédé est réalisé de préférence dans un logement unitaire, mettant en oeuvre un broyage autogène pour la comminution des particules ainsi qu'un rotor de sélection permettant de séparer la partie fragmentée des particules de carbone en fonction du différentiel de densité entre les particules de cendre siliceuse et les particules de carbone. L'invention concerne également un procédé permettant de réaliser un mélange de ciment à partir des cendres de combustion à basse teneur en carbone. L'invention concerne enfin un dispositif permettant de réduire la teneur en carbone des cendres de combustion.
Pittsburgh Mineral And Environmental Technology Inc.
Smart & Biggar
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