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The solvent extraction performance of N,N’-dimethyl-N,N’-dibutylmalonamide towa...

The solvent extraction performance of N,N’-dimethyl-N,N’-dibutylmalonamide (DMDBMA) in 1,2-dichloroethane (1,2-DCE) towards platinum(IV) and palladium(II) in hydrochloric acid media was systematically evaluated. Pt(IV) extraction (%E) increases with the HCl concentration in the aqueous phases, being always higher than 72%, whereas Pd(II) extraction decreases from 65% at 1 M HCl to 22% at 8 M HCl. Several stripp...

Recovery of platinum and palladium from chloride solutions by a thiodiglycolami...

The liquid-liquid extraction of platinum(IV) and palladium(II) from hydrochloric acid media was carried out using N,N’-dimethyl-N,N’-dicyclohexylthiodiglycolamide (DMDCHTDGA) in 1,2-dichloroethane (1,2-DCE). Pt(IV) is efficiently extracted from 5 M HCl onwards (%E = 97%), whereas Pd(II) is quantitatively recovered from 1 to 8 M HCl solutions. Both Pt(IV) and Pd(II) can be successfully stripped from the loaded o...

Recomendações para o Diagnóstico e Tratamento do Adenocarcinoma Gástrico (Grupo...

Vertebral osteoporotic fractures with height loss secondary to Cushing’s disease

A Bacia Lusitaniana : estratigrafia, paleogeografia e tectónica

Recovery of precious metals from exhausted automotive catalysts by leaching and...

Platinum group metals (PGM’s) are precious and rare metals used in many existing and emerging technologies such as electronics, catalysts, energy and medical appliances, among others. PGM’s applications and demand are growing rapidly, and their supply is short and considered critical. Recycling of residues containing PGM’s is therefore mandatory, in order to allow the continuity of supplying. The main market sh...

Liquid crystal displays as secondary resources for Indium recovery: characteriz...

End-of-life liquid crystal display (LCD) monitors represent an important emerging flow in electric and electronics waste, which require urgently appropriate technologies for its management. These devices have environmental issues that discourage its treatment trough incineration or disposal. Moreover, the LCD-glass component has in its composition an important and strategic metal, indium, whose recycling is ess...

End-of-life Zn–MnO2 batteries: electrode materials characterization

Physical and chemical characterization of several sizes and shapes of alkaline and saline spent Zn–MnO2 batteries was carried out, aiming at contributing for a better definition of the applicable recycling processes. The characterization essays included the mass balance of the components, cathode and anode elemental analysis, the identification of zinc and manganese bearing phases and the morphology analysis of...

Characterization of Spent Ni-MH Batteries

Spent Ni-MH batteries are not considered too dangerous for the environment, but they have a considerable economical value due to the chemical composition of electrodes which are highly concentrated in metals. The present work aimed at the physical and chemical characterisation of spent cylindrical and thin prismatic Ni-MH batteries, contributing for a better definition of the recycling process of these spent pr...

Recycling of exhausted batteries and EAF dusts by leaching with several aqueous...

Zinc is a base metal present in several products of general use, and therefore found in numerous residues and end-of-life products. The two main sources of zinc containing wastes are spent Zn-MnO2 portable batteries and electric arc furnace (EAF) dusts from steelmaking plants. The recovery of metals from these residues by appropriate recycling processes is mandatory due to environmental, economic and resource c...