scrapis generated while manufacturing alloy magnets for
VCMs, which is the primary application of Nd. This scrap
contains not only sludge powder that is produced when
machining the magnet, but also ‘‘off-spec’’ products in which
the impurity of oxygen content exceeds the required
specification. Even though approximately 50% of Nd
charged as feed material is disposed of as scrap during the
manufacturing process, Nd is currently not being recycled.
This is because Nd forms an extremely stable compound with
many elements including oxygen, which makes it very
difficult to reuse or recycle the scrap. Most developed
countries import almost 100% of their Nd requirement, and a
high percentage of the valuable material is simply disposed
of without being utilized as a product. Considering the fact
that a large proportion of the total Nd produced worldwide
comes from a few particular countries,2) the establishment of
an efficient process for the recovery of Nd from alloy scrap is
a major concern from the point of view of better industrial
policy as well as secure resource procurement.
scrapis generated while manufacturing alloy magnets forVCMs, which is the primary application of Nd. This scrapcontains not only sludge powder that is produced whenmachining the magnet, but also ‘‘off-spec’’ products in whichthe impurity of oxygen content exceeds the requiredspecification. Even though approximately 50% of Ndcharged as feed material is disposed of as scrap during themanufacturing process, Nd is currently not being recycled.This is because Nd forms an extremely stable compound withmany elements including oxygen, which makes it verydifficult to reuse or recycle the scrap. Most developedcountries import almost 100% of their Nd requirement, and ahigh percentage of the valuable material is simply disposedof without being utilized as a product. Considering the factthat a large proportion of the total Nd produced worldwidecomes from a few particular countries,2) the establishment ofan efficient process for the recovery of Nd from alloy scrap isa major concern from the point of view of better industrialpolicy as well as secure resource procurement.
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