【摘 要】
：
The fate of zinc,lead,and iron present in electric arc furnace dusts is investigated during thermal treatment of the dust with flame-retarded polycarbonate(PC-Br)resin containing tetrabromobisphenol A
【机 构】
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Institute of Multidisciplinary Research for Advanced Materials,Tohoku University,Sendai,Japan;Instit
【出 处】
：
第十届中国钢铁年会暨第六届宝钢学术年会
论文部分内容阅读
The fate of zinc,lead,and iron present in electric arc furnace dusts is investigated during thermal treatment of the dust with flame-retarded polycarbonate(PC-Br)resin containing tetrabromobisphenol A(TBBPA).Mixtures of these materials were heated under either oxidizing or inert conditions in a laboratory-scale furnace at 550 °C for 80 min.The resulting products were then characterized using X-ray diffraction,inductively coupled plasma,and ion chromatography.The results obtained indicate that inorganic bromine evolved from decomposing flame-retarded resin almost completely reacts with metal(zinc and lead)oxides present in the dust.The highest bromination rates of zinc(78%and 81%)and lead(90%and 93%)were obtained under oxidizing conditions during thermal treatment of mixture comprising PC-Br and EAF dust at ratios of 6:1 and 9:1 w/w,respectively.The metallic bromides formed were almost entirely vaporized from the solid residues.Iron remained in an iron-enriched solid residue.The results indicated that heating such mixtures under specific conditions enables a high separation of zinc and lead from iron-rich residues within an attractive temperature range.Heating under inert conditions had little effect on the effectiveness of the bromination-evaporation of zinc,but caused more abundant formation of char,decresed bromination of lead,and resulted in sporadic bromination of iron present in the dust.
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