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首页> 外文期刊>ISIJ international >De novo Formation of PCDD/F during Sintering: Effect of Temperature, Granule Size and Oxygen Content
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De novo Formation of PCDD/F during Sintering: Effect of Temperature, Granule Size and Oxygen Content

机译：烧结过程中PCDD / F的从头形成：温度，颗粒尺寸和氧含量的影响

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摘要

Integrated iron and steel industry is the major industrial source of dioxins or, more precisely, of polychlorinated dibenzo-p-dioxins (PCDD) and dibenzofurans (PCDF). Their main source is the sintering plant (preparing iron ore fines as feed for the blast furnace) and EAF for steelmaking. The influence of temperature (300–600°C), feed granule size (4 fractions, from 0.5–1 to 4–8 mm) and oxygen content (5 to 15 vol.%) on PCDD/F-formation has been investigated during de novo tests, involving a feed composed from the various sintering raw materials in their typical proportions. These experiments were conducted using a lab-scale vertical tube reactor and PCDD/F in off-gas and residue were collected together for analysis. Some CuCl_(2) catalyst was wetly added, to ensure that PCDD/F-formation activity was well measurable. The experimental results show that dioxins peak at 350°C, a granule size of 2 to 4 mm and the highest O_(2) concentration tested (15 vol.%). Within each homologue group, the isomer signature has been further scrutinized, with special emphasis on the seventeen 2,3,7,8-substituted PCDD/F, as well as on the seven PCDD-congeners and two TCDF usually associated with chlorophenol precursor routes, with the purpose to throw more light on the mechanism of PCDD/F-formation. For the first time ever, a complete congener-specific analysis is presented for sintering effluent and discussed. From this study and a number of former and ongoing studies, it is clear that iron oxide is responsible for the high PCDF/PCDD-ratio and the relatively low level of chlorination of PCDF and PCDD.
机译：钢铁工业是二恶英的主要工业来源，或更准确地说，是多氯二苯并对二恶英（PCDD）和二苯并呋喃（PCDF）的主要工业来源。它们的主要来源是烧结厂（准备铁矿石粉作为高炉的原料）和炼钢的电弧炉。在此过程中，研究了温度（300–600°C），进料粒度（4个组分，从0.5–1至4–8 mm）和氧含量（5至15体积％）对PCDD / F形成的影响。从头测试，包括按各种比例由各种烧结原料制成的饲料。这些实验是使用实验室规模的垂直管反应器进行的，废气中的PCDD / F和残留物被收集在一起进行分析。湿添加一些CuCl_（2）催化剂，以确保可以很好地测量PCDD / F的形成活性。实验结果表明，二恶英在350°C达到峰值，颗粒大小为2至4 mm，测试的最高O_（2）浓度（15％（体积））。在每个同系物组中，已进一步研究了异构体的特征，特别强调了十七种2,3,7,8取代的PCDD / F，以及通常与氯酚前体途径相关的七个PCDD同源物和两个TCDF。 ，目的是进一步阐明PCDD / F形成的机理。有史以来第一次，针对烧结废水提出了完整的同类物特定分析并进行了讨论。从这项研究以及许多先前的和正在进行的研究中，很明显，氧化铁是造成PCDF / PCDD比率高和PCDF和PCDD氯化程度相对较低的原因。

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