Method for producing ternesite-belite calcium sulfoaluminate clinker

A method for producing a hydraulically reactive clinker by sintering a raw meal mixture, which contains sources for CaO, Al2O3(Fe2O3), SiO2 and SO3, wherein

• the raw meal mixture is sintered in a temperature range of >1200° C. to 1350° C. over a period of time sufficient to convert the raw meal mixture into a clinker intermediate product,
• the clinker intermediate product is tempered in a temperature range of 1200° C. to a lower limit of 750° C. over a period of time sufficient to obtain 5 to 75 wt % of C5S2$ and to convert an amount of aluminate and ferrate phases and residues of crystalline high-temperature phases of the raw meal mixture with remaining C$ into additional C4(AxF1-x)3$ and C5S2$, and
• the clinker comprising main components C4(AxF1-x)3$, (α;
• β) C2S, and C5S2$ in the following proportions
• C5S2$
• 5 to 75 wt %
• C2S
• 1 to 80 wt %
• C4(AxF1−x)3$
• 5 to 70 wt %
• one or more
• 0 to 30 wt %,
• secondary phases
• wherein x is a number from 0.1 to 1, is cooled.