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In this paper a simple method for all waste recovery through municipal solid waste incineration (MSWI) is presented. For the first time, MSWI fly ash (FA) is treated using MSWI bottom ash (BA), which is considered as a new urban mining source due to its pozzolanic characteristics. The proposed technology involves mixing these ashes with two other components: flue gas desulphurization residue and coal fly ash. Thermal annealing at a low temperature (120 °C for 4 h) can also be performed, to accelerate some reactions, but it is not necessary for stabilization. The efficacy of the process is demonstrated by the comparison of elemental concentrations in leaching solutions that are detected in the untreated ashes and the obtained stabilized materials, which show the reduced solubility of leachable Zn and Pb (with respect to the starting MSWI FA). The chemical, morphological, and structural characterization of the …