8 documents found, page 1 of 1
Development of MWCNT/Magnetite flexible triboelectric sensors by magnetic patte...
Esteves, David Seixas; Pereira, Manuel F. C.; Ribeiro, Ana; Durães, Nelson; Paiva, Maria C.; Sequeiros, Elsa W.The fabrication of low-electrical-percolation-threshold polymer composites aims to reduce the weight fraction of the conductive nanomaterial necessary to achieve a given level of electrical resistivity of the composite. The present work aimed at preparing composites based on multiwalled carbon nanotubes (MWCNTs) and magnetite particles in a polyurethane (PU) matrix to study the effect on the electrical resistan...
XRD Identification of Ore Minerals during Cruises: Refinement of Extraction Pro...
Milinovic, Jelena; Dias, Ágata Alveirinho; Janeiro, Ana I.; Pereira, Manuel F. C.; Martins, Sofia; Petersen, Sven; Barriga, Fernando J A SThe on-board identification of ore minerals during a cruise is often postponed until long after the cruise is over. During the M127 cruise, 21 cores with deep-seafloor sediments were recovered in the Trans-Atlantic Geotraverse (TAG) field along the Mid Atlantic Ridge (MAR). Sediments were analyzed on-board for physicochemical properties such as lightness (L*), pH and Eh. Selected samples were studied for minera...
Hydrometallurgical recycling of lithium-ion batteries by reductive leaching wit...
Vieceli, N.; Nogueira, Carlos; Guimarães, C.; Pereira, Manuel F. C.; Durão, F.; Margarido, F.ABSTRACT: The hydrometallurgical extraction of metals from spent lithium-ion batteries (LIBs) was investigated. LIBs were first dismantled and a fraction rich in the active material was obtained by physical separation, containing 95% of the initial electrode, 2% of the initial steel and 22% of plastic materials. Several reducers were tested to improve metals dissolution in the leaching step using sulphuric acid...
Recovery of lithium carbonate by acid digestion and hydrometallurgical processi...
Vieceli, N.; Nogueira, Carlos; Pereira, Manuel F. C.; Durão, F.; Guimarães, C.; Margarido, F.ABSTRACT: Lithium extraction from hard-rock ores has regained importance due to the increased demand for this metal to supply the growing battery market. Therefore, several studies have been focused on the lithium extraction from ores, however, leaching and purification steps are sparsely studied. Thus, the objective of this study was to evaluate the main factors affecting the water leaching step and the subseq...
Optimization of an innovative approach involving mechanical activation and acid...
Vieceli, N.; Nogueira, Carlos; Pereira, Manuel F. C.; Durão, F.; Guimarães, C.; Margarido, F.ABSTRACT: The recovery of lithium from hard rock minerals has received increased attention given the high demand for this element. Therefore, this study optimized an innovative process, which does not require a high-temperature calcination step, for lithium extraction from lepidolite. Mechanical activation and acid digestion were suggested as crucial process parameters, and experimental design and response-surf...
Hydrometallurgical recycling of lithium-ion batteries by reductive leaching wit...
Vieceli, N.; Nogueira, Carlos; Guimarães, C.; Pereira, Manuel F. C.; Durão, F.; Margarido, F.ABSTRACT: The hydrometallurgical extraction of metals from spent lithium-ion batteries (LIBs) was investigated. LIBs were first dismantled and a fraction rich in the active material was obtained by physical separation, containing 95% of the initial electrode, 2% of the initial steel and 22% of plastic materials. Several reducers were tested to improve metals dissolution in the leaching step using sulphuric acid...
Optimization of metals extraction from spent lithium-ion batteries by sulphuric...
Vieceli, N.; Nogueira, Carlos; Pereira, Manuel F. C.; Durão, F.; Guimarães, C.; Margarido, F.ABSTRACT: The main factors that affect the extraction of metals from spent lithium-ion batteries by acid leaching using H2SO4, and sodium metabisulphite, were evaluated and optimized through a set of experiments, framed by a techno-economic approach. The maximum value of the profit response was obtained with the highest possible values of acid concentration (2.5 M) and time (2 h), a liquid/solid ratio of 5 L/kg...
Tailoring of structures and permeation properties of asymmetric nanocomposite c...
Figueiredo, Ana Sofia; Sánchez-Loredo, María Guadalupe; Maurício, António; Pereira, Manuel F. C.; Minhalma, Miguel; Pinho, Maria Norberta deCellulose acetate (CA)-silver (Ag) nanocomposite asymmetric membranes were prepared via the wet-phase inversion method by dispersing polyvinylpirrolydone-protected Ag nanoparticles in the membrane casting solutions of different compositions. Silver nanoparticles were synthesized ex situ and added to the casting solution as a concentrated aqueous colloidal dispersion. The effects of the dispersion addition on th...