The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2005
Filed:
Apr. 12, 2002
Jean-marie Lalande, Lévis, CA;
Anne Tremblay, Beauport, CA;
Jean-Marie Lalande, Lévis, CA;
Anne Tremblay, Beauport, CA;
CO2 Solution Inc., Quebec, CA;
Abstract
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.