title: Leaching properties of electric arc furnace dust prior/following alkaline extraction.
abstract: This study was carried out to determine the appropriate treatment of electric arc furnace (EAF) dust prior to permanent disposal. The total heavy metal content as well as heavy metal leaching from EAF dust was investigated in five composite samples obtained from three Croatian and Slovenian steelworks. In order to recover zinc and reduce its leaching from the dust, all five samples were submitted to alkaline extraction with 10 M NaOH. Reduction of Cr (VI) to Cr(III) was conducted using FeSO4 x 7H2O solution. The elements Mn, Fe, Cu, Ni, and notably Zn and Pb, exhibited highest mobility during toxicity characteristic leaching procedure (TCLP). Comparing to TCLP extracts of initial EAF dust, zinc was found to be over 15 times lower and lead over 200 times lower in TCLP extracts of EAF dust processed by the alkaline leaching method. Since Cr (VI) exceeded its permissible level in the DIN 38414-S4 extracts of both initial and alkaline digested dust, its reduction to Cr (III) prior to permanent disposal is necessary. The recovery of zinc from EAF dust treated with alkaline agent ranged from 50.3% to 73.2%. According to phase analysis, recovery yield showed dependence on zincite/franklinite ratio. The results of the study indicate that permanent disposal of EAF dust require the following procedure: alkaline digestion (followed by leachate purification and alkaline zinc electrolyses), chromate reduction (if necessary), solidification of leaching residue and its testing using the leaching analyses.
authors: Ruder Bosković Institute, Laboratory for Radioecology, Zagreb, Croatia. vobescan@rudjer.irb.hr
authors: Visnja
authors: V
authors: Orescanin
authors: Luka
authors: L
authors: Mikelić
authors: Tahir
authors: T
authors: Sofilić
authors: Alenka
authors: A
authors: Rastovcan-Mioc
authors: Krunoslav
authors: K
authors: Uzarević
authors: Gordana
authors: G
authors: Medunić
authors: Loris
authors: L
authors: Elez
authors: Stipe
authors: S
authors: Lulić
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D004391:Dust / Q000032:analysis*; D005296:Ferrous Compounds / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis*; D008669:Metallurgy; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D017942:Nitric Acid / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013232:Steel; D013464:Sulfuric Acids / Q000737:chemistry; D018505:Waste Management; D014867:Water / Q000737:chemistry
chemical_list: D004391:Dust; D005296:Ferrous Compounds; D007220:Industrial Waste; D019216:Metals, Heavy; D013464:Sulfuric Acids; D014867:Water; D013232:Steel; C020748:ferrous sulfate; D017942:Nitric Acid; D012972:Sodium Hydroxide; C033158:sulfuric acid; D019342:Acetic Acid