Salihoglu Guray, Pinarli Vedat
Uludag University, Faculty of Engineering & Architecture, Environmental Engineering Department, 16059 Bursa, Turkey.
J Hazard Mater. 2008 May 30;153(3):1110-6. doi: 10.1016/j.jhazmat.2007.09.066. Epub 2007 Sep 25.
The purpose of this study was to determine an appropriate treatment for steel foundry electric arc furnace dust (EAFD) prior to permanent disposal. Lime and Portland cement (PC)-based stabilization was applied to treat the EAFD that contains lead and zinc above the landfilling limits, and is listed by USEPA as hazardous waste designation K061 and by EU as 10 02 07. Three types of paste samples were prepared with EAFD content varying between 0 and 90%. The first type contained the EAFD and Portland cement, the second contained the EAFD, Portland cement, and lime, and the third contained the EAFD and lime. All the samples were subjected to toxicity characteristics leaching procedure (TCLP) after an air-curing period of 28 days. pH changes were monitored and acid neutralization capacity of the samples were examined. Treatment effectiveness was evaluated in terms of reducing the heavy metal leachability to the levels below the USEPA landfilling criteria. An optimum composition for the EAFD stabilization was formulated as 30% EAFD +35% lime +35% Portland cement to achieve the landfilling criteria. The pH interval, where the solubility of the heavy metals in the EAFD was minimized, was found to be between 8.2 and 9.4.
本研究的目的是确定在永久处置之前对钢铁铸造电弧炉粉尘（EAFD）进行适当处理的方法。采用基于石灰和波特兰水泥（PC）的稳定化方法来处理铅和锌含量超过填埋限值、被美国环境保护局（USEPA）列为危险废物编号K061且被欧盟列为10 02 07的电弧炉粉尘。制备了三种类型的浆体样品，电弧炉粉尘含量在0%至90%之间变化。第一种类型包含电弧炉粉尘和波特兰水泥，第二种包含电弧炉粉尘、波特兰水泥和石灰，第三种包含电弧炉粉尘和石灰。所有样品在空气养护28天后进行毒性特性浸出程序（TCLP）。监测pH值变化并检查样品的酸中和能力。根据将重金属浸出率降低到低于美国环境保护局填埋标准的水平来评估处理效果。确定电弧炉粉尘稳定化的最佳配方为30%电弧炉粉尘+35%石灰+35%波特兰水泥，以达到填埋标准。发现电弧炉粉尘中重金属溶解度最小的pH区间为8.2至9.4。
