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Effect of Pre-Sintering on the Diffusion Treatment of HRE for Coercivity Enhancement of a NDFEB Sintered Magnet

100%

Lee M. W. , Lee J. K. , Jang T. S.

Development of a prototype shredder for WEEE equipped with NdFeB magnets

86%

Friebe P.

tom vol. 41, iss. 2

143--157

Waste Electrical and Electronic Equipment (WEEE) that contains neodymium magnets (NdFeB) has the potential to serve as a valuable source of elements, including critical ones. These magnets contain Rare Earth Elements (REEs) like Neodymium, Dysprosium, and Praseodymium. A noteworthy method of recycling REEs involves the magnet-to-magnet process, wherein the NdFeB alloy is separated from WEEE and directly reused in the production of new products, specifically new NdFeB magnets. The initial step in this recycling process involves disintegration, a procedure aimed at reducing and segregating the materials within the WEEE. The conventional process of disintegrating WEEE for recycling faces challenges due to the presence of magnetic materials, making it ineffective with existing equipment. To address this, a specialized device called a disintegrator, using counter-rotating cutting shafts, has been developed for efficient shredding of WEEE containing NdFeB. The goal of the research is to develop a prototype shredder to effectively recover valuable metals, including REEs, from WEEE. Specific sub-objectives include motor and gearbox selection, shaft bearings selection, gear design, and cutting blades design. The work involved calculations and 3D modelling of the disintegrator components using Autodesk Inventor 2020 software.

Novel Extraction Process Of Rare Earth Elements From NdFeB Powders Via Alkaline Treatment

72%

Chung K. W. , Kim C.-J. , Yoon H.-S.

tom Vol. 60, iss. 2B

1301--1305

The alkaline treatment of NdFeB powders in NaOH solution at various equivalent amounts of NaOH at 100°C was performed. The resultant powders were then leached in 0.5M H2SO4 solution at 25°C for 2 minutes. At 5 equivalents of NaOH, neodymium in NdFeB powders was partially transformed to neodymium hydroxide. The transformation of neodymium to neodymium hydroxide actually occurred at 10 equivalents of NaOH and was facilitated by increasing the equivalent of NaOH from 10 to 30. In addition, iron was partially transformed to magnetite during the alkaline treatment, which was also promoted at a higher equivalent of NaOH. The leaching yield of neodymium from alkaline-treated powders was increased with an increasing equivalent of NaOH up to 10; however, it slightly decreased with the equivalent NaOH of over 10. The leaching yield of iron was inversely proportional to that of rare earth elements. NdFeB powders treated at 10 equivalents of NaOH showed a maximum leaching yield of neodymium and dysprosium of 91.6% and 94.6%, respectively, and the lowest leaching yield of iron of 24.2%, resulting in the highest selective leaching efficiency of 69.4%.

Kradzież energii za pomocą magnesu neodymowego i jej wykrywanie

72%

Billewicz K.

Przegląd Elektrotechniczny

2006

tom R. 82, nr 6

82-85

Od pewnego czasu można zaobserwować coraz większą ilość kradzieży energii polegającej na zbliżaniu do licznika silnego magnesu neodymowego. Problem ten dotyczy wszystkich spółek dystrybucyjnych, W niniejszej pracy została przedstawiona dotychczasowa wiedza na ten temat.

The quantity of illegal energy consumption in Poland enlarges. Recently recipients inserts the NdFeB Magnets - Neodymium Iron Boron magnets near the energy meter. The meter runs more slowly than it should. The author collected of the learning of illegal consumption of electric energy with NdFeB magnets.