title: Removal of chloride from electric arc furnace dust.
abstract: Electric arc furnace (EAF) dust with high chloride content increases the threat of dioxin emissions and the high chloride content reduces the value of recycled zinc oxide produced by EAF dust recycling plants. This study conducts a number of laboratory experiments to determine the technical feasibility of a new dechlorination method. These methods consist of a series of roasting processes and water washing processes. In the roasting process, EAF dust was heated in a tube furnace to evaluate the parameters of atmospheric conditions, roasting temperature, and roasting time. Results indicate that sulfation roasting is more efficient in reducing chloride content than other roasting processes. The water washing process can totally remove water-soluble chloride at a solid to liquid ratio of 1:10. However, the remaining water-insoluble substance is difficult to dechlorinate. For example, lead chloride forms a hydroxyl-halide (PbOHCl) and lead chloride carbonate (Pb(2)CO(3)Cl(2)) agglutinative matrix that is hard to wash away.
authors.affiliation: Sustainable Environment Research Center, National Cheng Kung University, No. 500, Sec. 3, An-Ming Rd., Tainan 709, Taiwan.
authors.forename: Wei-Sheng
authors.initials: WS
authors.lastname: Chen
authors.forename: Yun-Hwei
authors.initials: YH
authors.lastname: Shen
authors.forename: Min-Shing
authors.initials: MS
authors.lastname: Tsai
authors.forename: Fang-Chih
authors.initials: FC
authors.lastname: Chang
mesh_terms: D002712:Chlorides / Q000302:isolation & purification*; D004391:Dust / Q000032:analysis*; D004560:Electricity; D005240:Feasibility Studies; D017745:Incineration; D007220:Industrial Waste / Q000517:prevention & control*; D008669:Metallurgy; D012995:Solubility; D013431:Sulfates / Q000737:chemistry; D013696:Temperature
chemical_list: D002712:Chlorides; D004391:Dust; D007220:Industrial Waste; D013431:Sulfates