Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Thermal reaction characteristics of dioxins on cement kiln dust
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra09220b Ming-Xiu Zhan 1 , Shuping Pan 2 , Ivan Deviatkin 3 , Tong Chen 4 , Xiao-Dong Li 4
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra09220b Ming-Xiu Zhan 1 , Shuping Pan 2 , Ivan Deviatkin 3 , Tong Chen 4 , Xiao-Dong Li 4
Affiliation
|
Cement kiln dust is commonly recycled back into the production process. This results in elevated concentrations of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the flue gases of cement plants. The present study investigated the effects the reaction temperature, oxygen content, and origin of kiln dust had on the thermal reaction characteristics of PCDD/Fs. The concentration of 2,3,7,8-PCDD/Fs that were desorbed from the kiln dust decreased as the reaction temperature was increased and the higher temperature facilitated the degradation of PCDD/Fs. However, the oxygen content, which ranged from 6–21%, had only a minor impact on the thermal reaction characteristics of PCDD/Fs. Finally, the thermal reaction characteristics of PCDD/Fs were largely affected by the origin of the kiln dust; 1.2 pg I-TEQ g−1 was desorbed from kiln dust originating from a cement plant that co-processed refuse-derived fuel (RDF) and 47.5 pg I-TEQ g−1 was desorbed from kiln dust originating from a cement plant that co-processed hazardous waste. The study also found that PCDD/F formation pathways were dependent on the origin of the kiln dust; precursor synthesis dominated PCDD/F formation on the kiln dust collected from a cement plant that co-processed RDF, while de novo synthesis dominated the formation of PCDD/Fs on the remaining samples of kiln dust.
中文翻译：
二恶英对水泥窑粉尘的热反应特性
水泥窑粉尘通常被回收到生产过程中。这会导致多氯二苯并二苯的浓度升高- 水泥厂烟气中的二恶英和二苯并呋喃 (PCDD/Fs)。本研究调查了反应温度、氧含量和窑灰来源对 PCDD/Fs 热反应特性的影响。2,3,7,8-PCDD/Fs从窑灰中解吸出来的浓度随着反应温度的升高而降低，较高的温度有利于PCDD/Fs的降解。然而，6-21% 的氧含量对 PCDD/Fs 的热反应特性只有很小的影响。最后，PCDD/Fs 的热反应特性很大程度上受窑尘来源的影响；1.2 pg I-TEQ g -1从协同处理垃圾衍生燃料 (RDF) 和 47.5 pg I-TEQ g 的水泥厂的窑灰中解吸出来-1是从协同处理危险废物的水泥厂产生的窑灰中解吸出来的。研究还发现 PCDD/F 的形成途径取决于窑灰的来源；前体合成主导了从协同处理 RDF 的水泥厂收集的窑灰上 PCDD/F 的形成，而从头合成主导了剩余窑灰样品上 PCDD/F 的形成。
更新日期：2018-01-17
中文翻译：
二恶英对水泥窑粉尘的热反应特性
水泥窑粉尘通常被回收到生产过程中。这会导致多氯二苯并二苯的浓度升高- 水泥厂烟气中的二恶英和二苯并呋喃 (PCDD/Fs)。本研究调查了反应温度、氧含量和窑灰来源对 PCDD/Fs 热反应特性的影响。2,3,7,8-PCDD/Fs从窑灰中解吸出来的浓度随着反应温度的升高而降低，较高的温度有利于PCDD/Fs的降解。然而，6-21% 的氧含量对 PCDD/Fs 的热反应特性只有很小的影响。最后，PCDD/Fs 的热反应特性很大程度上受窑尘来源的影响；1.2 pg I-TEQ g -1从协同处理垃圾衍生燃料 (RDF) 和 47.5 pg I-TEQ g 的水泥厂的窑灰中解吸出来-1是从协同处理危险废物的水泥厂产生的窑灰中解吸出来的。研究还发现 PCDD/F 的形成途径取决于窑灰的来源；前体合成主导了从协同处理 RDF 的水泥厂收集的窑灰上 PCDD/F 的形成，而从头合成主导了剩余窑灰样品上 PCDD/F 的形成。
京公网安备 11010802027423号