Enhancement of cement clinker yield

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 7/48 (2006.01)

Patent

CA 2430594

The yield of cement clinker recovered from a kiln assembly is enhanced by feeding a particulate material comprising silica and an oxide of at least one of calcium and aluminum, for example, fly ash into contact with hot cement clinker; the fly ash melts to a partially fused material which chemically reacts with the hot clinker to produce a pyroprocessed cement clinker of crystalline hydraulic silicates; the extruder is added to the hot cement clinker downstream of the formation of the cement clinker, and suitably is added to the hot cement clinker at the upstream end of the cooler of the kiln assembly, or within the kiln, downstream of the burning zone, and more especially in the initial cooling zone at the discharge end of the kiln.

La production de ciment clinker récupérée à partir d'un ensemble four est améliorée par l'alimentation d'un matériau particulaire comprenant du silice et un oxyde d'aluminium et/ou de calcium, par exemple, des cendres légères en contact avec du ciment clinker chaud. Ces cendres légères fondent en un matériaux partiellement fondu qui réagit chimiquement avec le clinker chaud de façon à produire un ciment clinker pyrotraité de silicates hydrauliques cristallines. Les matières de charge sont ajoutée en aval du ciment clinker chaud de la formation de ce ciment clinker, et elles sont judicieusement ajoutées au ciment clinker chaud au niveau de l'extrémité amont du refroidisseur de l'ensemble four, ou dans le four, en aval de la zone de fusion et plus spécifiquement dans la zone de refroidissement initiale au niveau de l'extrémité d'évacuation du four.

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