Keywords: نفت شیل خاکستر را از بین می برد; Glass ceramic composite; Heavy metals; MSWI bottom ash; Oil shale fly ash; Sintering; VitrificationMSWI, municipal solid waste incineration; OSFA, oil shale fly ash; BA, bottom ash; VS, vitrified slag; RAM, raw ash mixture of 80 wt.% oil shale fly ash and