Process for rendering waste inert by cladding in a hydraulic binder and pre-mix for practicing this process

The present invention has for its object a process to stabilize and solidify wastes such as for example cinders, residues from incineration of household garbage and industrial wastes. The invention also relates to the pre-mix used to practice this process. 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.3AlO.CaSO(CAS). 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.3AlO.CaSO(CA{overscore (S)}). This pre-mix is preferably used for cladding residues of the incineration of household waste.