Method for producing ternesite-belite calcium sulfoaluminate clinker

摘要

The present invention relates to the production of a ternesite-belite-calcium sulfoaluminate (ferrite) clinker. The invention also relates to the use of alternative raw materials for clinker production, for example raw materials based on industrial byproducts, including those of low quality, such as lump slag and ash having a low glass content and/or a high free lime content and/or a high content of crystalline high-temperature phases, as well as naturally occurring rocks and rock glasses of comparative chemical composition.

主权项

1. 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 proportionsC5S2$5 to 75 wt %C2S1 to 80 wt %C4(AxF1−x)3$5 to 70 wt %one or more 0 to 30 wt %,secondary phaseswherein x is a number from 0.1 to 1, is cooled.