Abstract: The invention concerns a process for the treatment of incineration residues of urban or industrial wastes comprising the following steps;a first step of chemical analysis of the incineration residues of urban or industrial wastes in order to determine:their water-soluble sulfate content,the overall retarding or accelerating action of the water-soluble ions which are liable to hinder the setting or hardening of a Portland cement,a second step in which the urban or industrial waste incineration residues are mixed or crushed, with a hydraulic binder and additives, followed by granulation with water of the mixture obtained with the granules then left to harden, the nature and proportion of said hydraulic binder and said additives having been selected in order to allow both the physical and/or chemical neutralization of the harmful elements for setting or hardening of a Portland cement present in the wastes, as well as the production of granules with low porosity and low permeability.