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Sustainable Value Recovery of NdFeB Magnets: A Multi-Objective Network Design and Genetic Algorithm

By Hongyue Jin (3334947), Byung Duk Song (4914994), Yuehwern Yih (4914997) and John W. Sutherland (4532092)


Neodymium–iron–boron (NdFeB) magnets are widely used in clean energy applications such as wind turbines and electric vehicles whose demand is escalating. However, rare earth elements (REEs) for manufacturing NdFeB magnets are subject to significant supply uncertainty due to Chinese near-monopolistic supply. To mitigate the risk, companies are actively pursuing value recovery from end-of-life magnets. However, the questions of how to collect used magnets and smoothly transfer them through the reverse supply chain require further investigation. To address this challenge, this paper designs an efficient NdFeB magnet recovery infrastructure by identifying the optimal processing facility locations and defining the capacities and transportation flows that maximize the economic and environmental benefits and social support for the new business. Mathematical model and a <u>m</u>ulti-<u>o</u>bjective <u>n</u>etwork <u>d</u>esign <u>g</u>enetic <u>a</u>lgorithm (MONDGA) were designed to calculate solutions. When compared with the exact solutions implemented by CPLEX (an optimization package), MONDGA provided (near) optimal solutions with significantly improved computation efficiencies. As the real world model application required a large-scale optimization, MONDGA was superior to CPLEX, which failed to provide any solution. The results confirmed that our proposed model and algorithm offer a promising strategy for the NdFeB magnet recycling industry to enhance the economic and environmental sustainability and maximize social support

Topics: Biophysics, Medicine, Biotechnology, Ecology, Cancer, Space Science, Biological Sciences not elsewhere classified, Mathematical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Information Systems not elsewhere classified, supply chain, NdFeB magnet recycling industry, value recovery, MONDGA, bjective n etwork, solution, world model application, Sustainable Value Recovery, supply uncertainty, Mathematical model, transportation flows, earth elements, Multi-Objective Network Design, wind turbines, CPLEX, REE, m ulti, Chinese near-monopolistic supply, NdFeB magnet recovery infrastructure, algorithm offer, manufacturing NdFeB magnets, energy applications, NdFeB Magnets, computation efficiencies, esign g enetic, processing facility locations, paper designs, end-of-life magnets
Year: 2018
DOI identifier: 10.1021/acssuschemeng.7b03933.s001
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Provided by: FigShare
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