Ciments Francais

Bruno Classen

Pierre Colombet

Bruno Le Rolland

The lightly colored sulfoaluminous clinker contains: more than 55% by weight of calcium sulfoaluminate phase (C A S), more than 10% by weight of belite phase (C S), less than 10% by weight of anhydrite (C{overscore (S)}), and contains practically no ferrite phase, nor a gehlenite phase (C AS), nor free lime. It is prepared by a process of roasting carried out at temperatures comprised between about 1250&deg; C. and 1350&deg; C. It can be used for a wide range of applications by combining it with a source of calcium sulfate and/or Portland cement, to obtain binders having specific properties (color, setup time, mechanical strength, expansion or contraction . . . ).

Sulfoaluminous clinker without iron and without free lime, its process of preparation and its use in white binders

Waste is rendered inert, by cladding the waste in a cement base hydraulic binder including sulfoaluminate cement comprised by at least 30% by weight of the phase 3CaO.3Al O .CaSO (C A S). The hydraulic binder can be either essentially constituted by sulfoaluminate cement, or instead comprise one or several zeolites. A pre-mix is provided for practicing the process, containing at least one zeolite and at least 15% of sulfoaluminate cement, comprised of at least 30% of the phase 3CaO.3Al O .CaSO (C A {overscore (S)}). This pre-mix is preferably used for cladding residues of the incineration of household waste.

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Neauphle le Chateau, France

Bruno Classen