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:
Sep. 05, 2017
Filed:
Jul. 24, 2013
Karlsruher Institut Fuer Technologie, Karlsruhe, DE;
Hans Hunsinger, Weingarten, DE;
Guenter Beuchle, Karlsruhe, DE;
Peter Stemmermann, Karlsruhe, DE;
Uwe Schweike, Karlsruhe, DE;
Karolina Giziewicz, Berlin, DE;
Krassimir Garbev, Eggenstein-Leopoldshafen, DE;
KARLSRUHER INSTITUT FUER TECHNOLOGIE, Karlsruhe, DE;
Abstract
A process for preparing dicalcium silicate includes providing a starting material comprising calcium carbonate (CaCO) and silicon dioxide (SiO), wherein a molar ratio of calcium:silicon (C:S) is from 1.5:1 to 2.5:1. At least one of an inorganic alkali metal salt and an alkaline earth metal salt is added as a mineralizing agent to the starting material in an amount of from 0.5 wt.-% to 20 wt.-%, based on a total weight of the starting material. The starting material is reacted with the mineralizing agent in a gas atmosphere having a COpartial pressure of from 0.05 MPa to 0.2 MPa at a temperature of from 900° C. to 1100° C. so as to obtain a dicalcium silicate product. The dicalcium silicate product comprises a content of an unreacted starting material of <5 wt.-% and a total carbon content of <1.5 wt.-%, each based on a weight of the dicalcium silicate product.