Polychlorinated dibenzo-p-dioxins and dibenzofurans in off-gas and residue during desulphurisation of iron ore sintering off-gas Online publication date: Wed, 20-Feb-2019
by Yibo Zhang; Rong Zhu; Jingling Yang; Alfons Buekens; Hui Wang; Yun Wang; Pu Zhang
International Journal of Environment and Pollution (IJEP), Vol. 63, No. 4, 2018
Abstract: In this study, the concentrations of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), in brief dioxins (PCDD/Fs), were measured in the off-gas and solid by-products from two selected and distinct desulphurisation processes, one operating wet and one dry on sintering off-gas. All samples analysed showed a PCDFs to PCDDs ratio larger than unity. The removal efficiencies obtained in the two facilities were almost identical, about 40%, when based on the toxic equivalent quantity (TEQ), and the removal efficiency of PCDD/Fs was higher. Unexpectedly, the removal efficiency was strongly dependent on chlorination level and far higher for low chlorinated PCDD/Fs than for high chlorinated PCDD/Fs, showing even negative removal efficiency. Moreover, the Hagenmaier profile was markedly different for the gas phase samples than for residue. These findings suggest that during desulphurisation both physical effects, such as adsorption, chemical reactions, as well as memory effects may have occurred.
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