Parameters affecting the formation mechanisms of dioxins in the steel manufacture process
| Autor: | Xiaoqing Lin, Mingxiu Zhan, Peng-Tao Cai, Alfons Buekens, Shuaixi Xu, Tong Chen, Xiaodong Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Basic oxygen steelmaking
China Environmental Engineering Polychlorinated Dibenzodioxins Health Toxicology and Mutagenesis 0208 environmental biotechnology Sintering 02 engineering and technology Incineration 010501 environmental sciences Raw material Dioxins 01 natural sciences Coal Ash chemistry.chemical_compound Environmental Chemistry Industry Particle Size 0105 earth and related environmental sciences Electric arc furnace Chlorophenol business.industry Chemistry Metallurgy Public Health Environmental and Occupational Health Temperature General Medicine General Chemistry Dibenzofurans Polychlorinated Pollution Steelmaking 020801 environmental engineering Steel Fly ash Particle size business |
| Zdroj: | Chemosphere. 222 |
| ISSN: | 1879-1298 |
| Popis: | With the implementation of the new national standards in the steel industry, dioxins (polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs)) emission and control have attracted more and more attention in China. The PCDD/Fs levels and signatures of nine steelmaking materials and by-products were experimentally analysed and compared, including five kinds of steelmaking fly ash (sintering fly ash, basic oxygen furnace fly ash, electric arc furnace fly ash and two kinds of blast furnace fly), three kind of steel sludge (continuous casting sludge, hot rolling sludge and cold rolling sludge) and sintering raw material. Dioxin formation from the sintering fly ash was highest of all 9 materials. Furthermore, highly chlorinated PCDD/Fs homologues were abundant in that sample, while the profiles were contrary to those of other materials. More importantly, the entire isomer signatures of all 61 samples were analysed, involving various materials, temperatures, oxygen levels, particle size and inhibitors, with special emphasis on those congeners associated with chlorophenol precursor routes, as well as seventeen 2,3,7,8-substituted PCDD/Fs. Strong correlation was found among seven PCDD-congeners of CP-route. The analysis of the molecular structure of these congeners revealed that 2,4,6/2,3,5-trichlorophenol may act as a precursor to form all those PCDD-congeners by condensation. In addition, the influence of various factors (temperature, oxygen level, particle size, inhibitors addition etc.) on the relative importance of CP-route congeners and 2,3,7,8-substituted congeners was discussed, with the goal of shedding more light on the mechanism of PCDD/Fs-formation. |
| Databáze: | OpenAIRE |
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