Co2 Solution Inc.

Anne Tremblay

Jean-Marie Lalande

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 CO; 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 or said metal. Preferably, the metal ions are Caobtained from the dissolution of a material selected from the group consisting of CaCl, cement kiln dust and sea salts and the carbonate is CaCOwhich is advantageously recycled into the process by adding the CaCOto the mixture of step a). A cement plant for performing this process is also disclosed.

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Beauport, Canada

Anne Tremblay