A process for treatment of hazardous waste, comprising stages of a) preparing a mixture of at least three different hazardous waste for the preparation of cladding or flooring glass-ceramic materials selected from a group constituted by: A) ACMs - asbestos-containing materials B) Spent calcium and other substances originating from purification plants C) Sludges produced by purification of industrial effluents D) Heavy waste and light ash coming from incinerators and combustion plants E) Drainage slurry from wet-ground contaminants, or from storage plants F) Sludge from restored contaminated terrain G) Hydro-metallurgical sludge H) Metallurgic-process waste I) Glass and television screens, computers, electronic apparatus, glass fibre and glass waste an overall quantity of hazardous waste contained in the mixture being at least 50% in weight of the mixture; b) grinding and/or mixing and melting said mixture up to formation of a molten glass; c) heating a vitrified material obtained in the preceding stage b) up to ceramicisation of the vitrified material, characterised in that said ceramicisation stage c) is preceded by the stages of b2) solidifying and grinding said vitrified material obtained in stage b) such as to obtain a glass powder; b3) mixing said glass powder with a bond for improving the cohesion capacities of the mixture after pressing. b4) pressing said powder mixture such as to obtain a manufacture of compacted powders; the stage of ceramicisation (c) being obtained by firing the compacted powder product such as to ceramicise the glass powders. a) preparing a mixture of at least three different hazardous waste for the preparation of cladding or flooring glass-ceramic materials selected from a group constituted by: A) ACMs - asbestos-containing materials B) Spent calcium and other substances originating from purification plants C) Sludges produced by purification of industrial effluents D) Heavy waste and light ash coming from incinerators and combustion plants E) Drainage slurry from wet-ground contaminants, or from storage plants F) Sludge from restored contaminated terrain G) Hydro-metallurgical sludge H) Metallurgic-process waste I) Glass and television screens, computers, electronic apparatus, glass fibre and glass waste an overall quantity of hazardous waste contained in the mixture being at least 50% in weight of the mixture; A) ACMs - asbestos-containing materials B) Spent calcium and other substances originating from purification plants C) Sludges produced by purification of industrial effluents D) Heavy waste and light ash coming from incinerators and combustion plants E) Drainage slurry from wet-ground contaminants, or from storage plants F) Sludge from restored contaminated terrain G) Hydro-metallurgical sludge H) Metallurgic-process waste I) Glass and television screens, computers, electronic apparatus, glass fibre and glass waste b) grinding and/or mixing and melting said mixture up to formation of a molten glass; c) heating a vitrified material obtained in the preceding stage b) up to ceramicisation of the vitrified material, b2) solidifying and grinding said vitrified material obtained in stage b) such as to obtain a glass powder; b3) mixing said glass powder with a bond for improving the cohesion capacities of the mixture after pressing. b4) pressing said powder mixture such as to obtain a manufacture of compacted powders;