Department of Chemistry, URI, Campus de Erechim, Erechim, RS 99700-000, Brazil.
J Hazard Mater. 2009 Dec 30;172(2-3):1677-80. doi: 10.1016/j.jhazmat.2009.07.026. Epub 2009 Jul 15.
The pyrometallurgic process that the exhausted batteries are submitted for the recovery of metallic lead generates great amount of a by-product called slag. The slag is composed mainly of iron ( approximately 60%) and lead ( approximately 6%), and this residue cannot be disposed in conventional landfill due to the high lead content. This work presents a new methodology for the extraction of lead from slag, based on the complexing effect of EDTA, a chelating ligand that has the ability to solubilize several heavy metals. As the iron (Fe(2+)/Fe(3+)) have a formation's constant with EDTA higher than the lead and is present in high concentrations in the samples, the fluoride ion (F(-)) was employed to mask the iron ions. The tests were carried out in a qualitative way, confirming the lead extraction by the formation of a yellow precipitate of lead iodide.
废电池进行火法冶金回收金属铅的过程会产生大量的一种称为炉渣的副产品。该炉渣主要由铁（约 60%）和铅（约 6%）组成，由于铅含量高，不能在常规垃圾填埋场处置。这项工作提出了一种从炉渣中提取铅的新方法，基于 EDTA 的络合效应，EDTA 是一种螯合剂，能够溶解多种重金属。由于铁（Fe(2+)/Fe(3+)）与 EDTA 的形成常数高于铅，并且在样品中浓度很高，因此使用氟离子（F(-)）来掩蔽铁离子。通过形成碘化铅的黄色沉淀，以定性方式进行了测试，确认了铅的提取。
