Method for producing magnesium silicate-belite-calcium aluminate cement

A method for producing a binder comprising the following steps:

• a) providing a starting material from one or more raw materials that contain CaO, MgO, SiO2, Al2O3 and Fe2O3 or other compounds of these elements, wherein the starting material has a molar (Ca+Mg)/(Si+Al+Fe) ratio from 1 to 3.5, a molar Ca/Mg ratio from 0.1 to 100, and a molar Al/Si ratio from 100 to 0.1, wherein constituents that are inert during a hydrothermal treatment in an autoclave are not taken into account for determination of the ratios,
• b) mixing the raw materials to form a starting material mixture,
• c) hydrothermal treating of the starting material mixture produced in step b) in an autoclave at a temperature from 100 to 300° C. and a residence time from 0.1 to 24 h, wherein the water/solids ratio is 0.1 to 100, to provide an intermediate product, and
• d) tempering the intermediate product obtained in step c) at 350 to 600° C., wherein the heating rate is 10-6000° C./min and the residence time is 0.01-600 min.