VERFAHREN ZUR HERSTELLUNG VON HYDRAULISCHEN BINDEMITTELN UNTER VERWENDUNG VON ANFALLSTOFFEN DER MECHANISCHEN UND ELEKTRISCHEN GASREINIGUNG

摘要

The invention relates to a process for producing hydraulic binders, in particular Portland cement and blast furnace cement, using materials arising in the mechanical and electrical purification of gases from coal-fired heating installations and power stations, preferably waste products from dry flue gas desulphurisation by the limestone additive process. This is preferentially oriented towards a utilisation, which is as complete as possible, of the energy content of the waste product. According to the invention, the quality-reducing or quality-damaging constituents of the material arising are converted by controlled physical, chemical and/or physical-chemical treatments, carried out during or/and before the production of binder from material arising, Portland cement clinker and, if appropriate, setting regulator, into compounds which promote the hydration reaction or at least do not adversely affect it. At the same time, the glassy aluminosilicate and silicate constituents of the converted material arising are utilised for alkali-buffering during the hydration of the binder.