36 documents found, page 1 of 4
Pre-treatment operations envisaging the processing of spent Li-ion batteries by...
Nogueira, Carlos; Margarido, F.ABSTRACT: In the recycling of spent batteries by hydrometallurgy, the pre-metallurgical processing is a crucial step to produce a concentrate (black-mass) rich in electrode materials, namely the cathode powders containing the metals Li, Ni, Co and Mn. In this paper, a series of operations including drying, thermal treatment, grinding and sieving were proposed and tested. Drying allowed to remove efficiently the...
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...
The role of automated sorting in the recovery of aluminium alloys waste
Nogueira, Carlos; Trancoso, Maria Ascensão; Pedrosa, Fátima; Crujeira, Teresa; Oliveira, Paula; Gonçalves, Ana Maria; Margarido, F.; Santos, R. NovaisA large number of aluminium alloys with varying alloying elements are present in vehicle structures and components, as well as in other household equipment. The recycling of these alloys is nowadays processed to low quality metal products due to high level of contamination, hindering the upgrading of recycling rates. The development and application of automated sorting technologies capable to detect, select and...
ELV recycling steps up a gear: development of improved sorting technologies for...
Nogueira, Carlos; Pedrosa, Fátima; Margarido, F.; Santos, R. Novais; Durão, F.; Guimarães, C.Although the number of end of life vehicles (ELVs) needing recycling is growing, due to processing limitations aluminium recycling rates are being hindered. A European-funded project - ShredderSort - aims to contribute to new solutions to the aluminium recycling industry. More than 10 million tons of automotive waste from end of life vehicles (ELV) are generated yearly in the EU and the values are continuously ...
Selective process of zinc extraction from spent Zn–MnO2 batteries by ammonium c...
Nogueira, Carlos; Margarido, F.Recycling of spent Zn-MnO2 batteries by hydrometallurgy is usually carried out by leaching in acid media, mainly with sulphuric acid solutions. Another type of leachant was used in this work, specifically solutions of concentrated ammonium chloride. The development of this study has relied on the prediction of the chemical behavior of the constituting phases based on data obtained from theoretical and experimen...
Collection of waste batteries in Portugal and Brazil
Vieceli, N.; Margarido, F.; Durão, F.; Guimarães, C.; Nogueira, CarlosThe legal aspects governing the disposal of used batteries were established in the nineties of the last century in Brazil and Portugal. In Brazil the law establishes the implementation of a reverse logistics system of this waste, similar to the system of Portugal, in which there is an extended producer responsibility. Portugal, subjected to the targets set by the European Union, has increased collection rates, ...