Study of an Impact Mill-Based Mechanical Method for NdFeB Magnet Recycling

Nowadays, the circular economy is gaining more and more attention in sectors where the raw material supply is critical for both cost and geo-political reasons. Moreover, the environmental impact issue calls for recycling. From this perspective, the recovery of rare earth elements represents a strategic point. On the other hand, the high cost and the dangerous standard recovery methods that apply to NdFeB magnets limits options for traditional recycling. A new mechanical method is proposed, not requiring hydrogen, high temperature, or chemical processes, but instead using an impact mill designed to operate in vacuum. A traditional impact mill operating in a glove box filled with Ar atmosphere has also been used for comparison. The obtained NdFeB powders were analyzed in terms of magnetic properties and chemical composition, particularly in terms of the oxygen content.

Automated summary

Nowadays, the circular economy is gaining attention in sectors where raw material supply is critical. Recycling of rare earth elements, particularly NdFeB magnets, is important due to cost and environmental concerns. A new mechanical method for recycling without hydrogen, high temperature, or chemical processes has been proposed and compared with a traditional method. Analysis of the obtained NdFeB powders includes magnetic properties and chemical composition, specifically oxygen content.