A process and a plant for the production of portland cement...

C - Chemistry – Metallurgy – 04 – B

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C04B 7/36 (2006.01) B01D 53/62 (2006.01)

Patent

CA 2443222

A process is disclosed for producing cement clinker, comprising the steps of: a) providing a mixture of ground calcareous materials and ground argillaceous materials; b) heating the mixture of step a) to a temperature sufficient to calcine and fuse the ground materials to form the cement clinker, and thereby producing an exhaust gas containing CO2; c) catalysing the hydration of at least a portion of the CO2 contained in the exhaust gas and producing a solution containing bicarbonate ions and hydrogen ions; and d) adding to the solution obtained in step c) metal ions, and adjusting the pH of the solution to precipitate a carbonate of said metal. Preferably, the metal ions are Ca++ obtained from the dissolution of a material selected from the group consisting of CaCl2, cement kiln dust and sea salts and the carbonate is CaCO3 which is advantageously recycled into the process by adding the CaCO3 to the mixture of step a). A cement plant for performing this process is also disclosed.

L'invention concerne un procédé de production de clinker de ciment consistant (a) à préparer un mélange de matières calcaires terreuses et de matières argileuses terreuses, (b) à chauffer le mélange de l'étape (a) à une température suffisamment élevée pour calciner et fondre les matières terreuses de manière à former le clinker de ciment, d'où la production d'un gaz d'échappement contenant du CO¿2?, (c) à catalyser l'hydratation d'une partie au moins du CO¿2? contenu dans le gaz d'échappement et à produire une solution contenant des ions bicarbonate et des ions hydrogène, puis (d) à ajouter à la solution obtenue dans l'étape (c) des ions métalliques et à ajuster le pH de la solution en vue de précipiter un carbonate de ce métal. De préférence, les ions métalliques sont des ions Ca++ obtenus par dissolution d'une matière choisie dans le groupe constitué par CaCl¿2?, de la poussière de four à ciment et des sels marins. Le carbonate se présente sous forme de CaCO¿3? et peut être avantageusement recyclé dans le procédé par ajout du CaCO¿3? au mélange de l'étape (a). L'invention concerne également une usine de ciment permettant de mettre en oeuvre ce procédé.

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