Selective recovery of palladium from waste printed circuit boards by a novel non-acid process

Palladium Isolation and Purification from Nitrate Media: Efficient Process Based on Malonamides

“…Palladium (Pd) is a precious metal which has been the focus of extensive efforts for an efficient recovery from various wastes [1][2][3][4]. Generally, leaching of precious metals from wastes such as end of use automotive catalysts or shredded electronic scraps is performed in aqua regia, a mixture of nitric and chlorhydric acid, but there is also a peculiar interest on leaching with sole nitric acid (HNO 3 ) as Pd is highly soluble in this medium, along with silver (Ag), on the contrary to gold (Au) and platinum (Pt) [5,6].…”

Thermoregulated Coacervation, Metal-Encapsulation and Nanoparticle Synthesis in Novel Triazine Dendrimers

“…In contrast, titrated additions of K 2 PtCl 4 , IrCl 3 ∙xH 2 O, or CuSO 4 ∙5H 2 O did not promote precipitation. The selectivity observed could be useful, as the separation of gold or palladium from copper is of some interest in the recycling of microelectronic waste streams [33,34,35,36]. Simple sequestration strategies are also attracting attention [37,38].…”

Direct extraction of palladium and silver from waste printed circuit boards powder by supercritical fluids oxidation-extraction process

“…Pd 2+ dissolved in solution could be separated with base metals by solvent extraction method with S201 as extractant [28]. The total recovery rates of Pd and Ag in the waste PCBs were 84.56% and 96.19%, respectively.…”

“…Very few researches have been carried out on the enrichment characteristics of precious metals under supercritical conditions. Our previous studies revealed that dispersal precious metals in electronic waste could be enriched by a non-acid process and extracted by solvent methods [28,29]. However, the treatment of waste liquors after the solvent extraction process is inevitable.…”