title: Mechanism of unintentionally produced persistent organic pollutant formation in iron ore sintering.
abstract: Effects of temperature, carbon content and copper additive on formation of chlorobenzenes (CBzs) and polychlorinated biphenyls (PCBs) in iron ore sintering were investigated. By heating simulated fly ash (SFA) at a temperature range of 250-500°C, the yield of both CBzs and PCBs presented two peaks of 637ng/g-fly ash at 350°C and 1.5×10(5)ng/g-fly ash at 450°C for CBzs, and 74ng/g-fly ash at 300°C and 53ng/g-fly ash at 500°C. Additionally, in the thermal treatment of real fly ash (RFA), yield of PCBs displayed two peak values at 350°C and 500°C, however, yield of CBzs showed only one peak at 400°C. In the thermal treatment of SFA with a carbon content range of 0-20wt% at 300°C, both CBzs and PCBs obtained the maximum productions of 883ng/g-fly ash for CBzs and 127ng/g-fly ash for PCBs at a 5wt% carbon content. Copper additives also affected chlorinated aromatic formation. The catalytic activity of different copper additives followed the orders: CuCl2∙2H2O>>Cu2O>Cu>CuSO4>CuO for CBzs, and CuCl2∙2H2O>>Cu2O>CuO>Cu>CuSO4 for PCBs.
authors.affiliation: School of Chemistry and Environment, Beihang University, 37 Xueyuan Road, Beijing, China. Electronic address: sunif@buaa.edu.cn.
authors.forename: Yifei
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Energy and Power Engineering, Beihang University, 37 Xueyuan Road, Beijing, China.
authors.forename: Lina
authors.initials: L
authors.lastname: Liu
authors.affiliation: School of Chemistry and Environment, Beihang University, 37 Xueyuan Road, Beijing, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Fu
authors.affiliation: School of Chemistry and Environment, Beihang University, 37 Xueyuan Road, Beijing, China.
authors.forename: Tianle
authors.initials: T
authors.lastname: Zhu
authors.affiliation: Department of Chemical Engineering, Free University of Brussels, Pleinlaan 2, 1050 Brussel, Belgium.
authors.forename: Alfons
authors.initials: A
authors.lastname: Buekens
authors.affiliation: School of Energy and Power Engineering, Beihang University, 37 Xueyuan Road, Beijing, China.
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Yang
authors.affiliation: School of Energy and Power Engineering, Beihang University, 37 Xueyuan Road, Beijing, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
keywords: Carbon content; Chlorinated aromatics; Copper additive; Iron ore sintering; Temperature