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Formation of dioxin in industrial combustors and pyrometallurgical plants

机译：工业燃烧器和火法冶金工厂中二恶英的形成

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摘要

The formation and destruction of PCDD/F in industrial and pyrometallurgical processes are inves- tigated on the basis of a case study in a secondary copper smelting plant. PCDD/F data have been gathered at different positions of the smelting plant. Under the reducing conditions of the vertical shaft furnace mainly PCDD are formed and largely destroyed by thermal postcombustion. How- ever, while the flue gases are cooled from 1100 deg. C to 350 deg. C the concentrations of PCDD and PCDF in flue gases are increased by a factor of 10 and 80, respectively. laboratory testing of de novo syn- thesis on the fly ashes collected at several positions in the smelting shows that when the boiler ash is subjected to thermal treatment at 300 deg. C for 2 h in air, the amount of PCDD is in- creased by a factor of 1.85 and 2.5, respectively.
机译：根据二级铜冶炼厂的案例研究，对工业和火法冶金过程中PCDD / F的形成和破坏进行了研究。 PCDD / F数据已在冶炼厂的不同位置收集。在立式竖炉的还原条件下，主要形成PCDD，并因热后燃烧而大大破坏。但是，当烟气从1100度冷却时。 C至350度C烟气中PCDD和PCDF的浓度分别增加了10倍和80倍。在冶炼过程中多个位置收集的粉煤灰上从头合成的实验室测试表明，当锅炉灰分在300度进行热处理时。在空气中保持2小时，PCDD的量分别增加了1.85和2.5倍。

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