Search results for " Rare Earths"

showing 3 items of 3 documents

Surfactant-based enrichment of rare earth elements from NdFeB magnet e-waste: Optimisation of cloud formation and rare earths extraction

2023

Appropriate waste and resource management are essential for a sustainable circular economy with reduced environmental impact. With critical resources, e-waste may serve as indirect raw material. For example, with NdFeB permanent magnets, Neodymium (Nd) and the co-present Dysprosium (Dy) are critical rare earth elements (REEs). However, there exists no economically viable technology for recycling them from electronic waste (e-waste). Here, a method is presented based on cloud point extraction (CPE). The work involves basic complexation chemistry in a cloud medium with pure REE salts, as well as, with real NdFeB-magnets (nearly 28% REE content by weight) from an old hard disk drive (5.2 g mag…

Critical raw materialsCircular economymagneetitgreen processrecyclingE-wasteCloud point extractionRare earthsMaterials ChemistryRecyclingresource managementPhysical and Theoretical Chemistrypinta-aktiiviset aineetSpectroscopyrare earthsResource managemente-wastecircular economycritical raw materialsharvinaiset maametallitsustainabilityCondensed Matter PhysicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsSustainabilitytalteenottouuttoGreen processkiertotaloussähkö- ja elektroniikkaromucloud point extractionkierrätysCircular economy; Sustainability; Rare earths; Recycling; E-waste; Cloud point extraction; Resource management; Critical raw materials; Green processJournal of Molecular Liquids
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Zirconium, Hafnium and Rare Earths behaviour during the transport in volcanic fluids. Geochemical effects throughout the sublimation and after intera…

This research indicates the fate of Zr, Hf and Rare Earths during their sublimation from the high-temperature gas phase (100° - 420 °C), in volcanic systems associated with different geodynamic regimes, and processes associated with volcanic sublimation representing the last natural “inorganic” interface where a detailed investigation into the behaviour of Rare Earths had never been conducted. The research was carried out in active volcanic systems at Vulcano (Aeolian Islands, Italy), Santorini (Cyclades Islands, Greece), Phlegrean Fields (Italy), Tenerife (Canary Islands, Spain) and Fogo Island (Cape Verde) where both fumaroles and thermal waters from submarine springs and inland wells wer…

Geochemistry Rare Earths Zirconium and Hafnium sublimates and condensatesSettore GEO/08 - Geochimica E Vulcanologia
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THE FATE OF ZR AND HF IN AQUATIC SYSTEMS UNDER THE EFFECTS OF SOLID-LIQUID INTERFACE PROCESSES, INTERPRETED IN THE LIGHT OF BEHAVIOUR OF RARE EARTHS …

2012

LIGHT OF BEHAVIOUR OF RARE EARTHS ELEMENTS AND YTTRIUM.THE EFFECTS OF SOLID-LIQUID INTERFACE PROCESSESTHE FATE OF ZR AND HF IN AQUATIC SYSTEMSSettore GEO/08 - Geochimica E Vulcanologia
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