Chemical Engineering Department, Jordan University of Science and Technology, Irbid 22110, Jordan.
Faculty of Engineering, University of Nottingham, Nottingham NG7-2RD, UK.
J Hazard Mater. 2014 Jun 15;274:87-97. doi: 10.1016/j.jhazmat.2014.03.019. Epub 2014 Mar 24.
Microwave treatment of electric arc furnace dust (EAFD) with poly(vinyl chloride) (PVC) was studied in this work. A comprehensive characterization of the dust as well as assessing the suitability of using the thermal de-chlorination of the common plastic (PVC) under inert atmosphere was carried out to assess the possibility of Zn and other heavy metals extraction (Pb and Cd) from EAFD. The dielectric and thermal properties of EAFD, PVC and their mixtures were measured. Once combined and heated the metal oxides present in the dust reacted with HCl released from PVC during thermal de-chlorination, forming metal chlorides which were subsequently recovered by leaching with water. It was found that zinc chloride could be almost completely recovered in the leaching stage, with the overall recovery of Zn reaching 97% when the EAFD:PVC ratio was 1:2. The investigation highlighted that franklinite, the most refractory mineral to leaching, was completely destroyed. The leaching residue was found to compose mainly of magnetite and hematite.
本工作研究了聚氯乙烯（PVC）对电弧炉粉尘（EAFD）的微波处理。对粉尘进行了全面的特性分析，并评估了在惰性气氛下使用常见塑料（PVC）热脱氯的适宜性，以评估从 EAFD 中提取锌和其他重金属（铅和镉）的可能性。测量了 EAFD、PVC 及其混合物的介电和热性能。一旦混合并加热，粉尘中存在的金属氧化物与 PVC 在热脱氯过程中释放的 HCl 反应，形成金属氯化物，随后用热水浸出回收。发现锌氯化物几乎可以完全在浸出阶段回收，当 EAFD:PVC 比为 1:2 时，锌的总回收率达到 97%。研究表明，最难浸出的尖晶石矿物被完全破坏。浸出残渣主要由磁铁矿和赤铁矿组成。
