Method for producing dicalcium silicate

US9751771B2 · kind B2 · utility

Assignee

• KARLSRUHER INSTITUT FÜR TECHNOLOGIE · DE

Inventors

• Hans Hunsinger · Weingarten, DE
• Guenter Beuchle · Karlsruhe, DE
• Peter Stemmermann · Karlsruhe, DE
• Uwe Schweike · Karlsruhe, DE
• Karolina Giziewicz · Berlin, DE
• Krassimir Garbev · Blankenloch, DE

Key dates

• Filing date: Jul 24, 2013
• Grant date: Sep 5, 2017
• Expiry date: Nov 29, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/18
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for preparing dicalcium silicate includes providing a starting material comprising calcium carbonate (CaCO3) and silicon dioxide (SiO2), 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 CO2 partial 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.