Table 1 Separation factors for DME-FC treatments of Sm-Co magnet leachate and Nd-Fe-B mixed magnet leachate for products depicted in Fig. 3.

From: Solvent-driven fractional crystallization for atom-efficient separation of metal salts from permanent magnet leachates

Leachate

Temperature

Product

Separation

\({{\upalpha }}\) (\({{{{{{\mathscr{l}}}}}}}_{0}\) → \({{{{{{\rm{s}}}}}}}_{1}\))

Sm-Co

20 °C

Co-rich

\({{{\upalpha }}}_{{{{{{\rm{Co}}}}}}/{{{{{\rm{Sm}}}}}}}\)

95.3

   

\({{{\upalpha }}}_{{{{{{\rm{Fe}}}}}}+{{{{{\rm{Co}}}}}}/{{{{{\rm{Sm}}}}}}}\)

86.9

   

\({{{\upalpha }}}_{{{{{{\rm{Fe}}}}}}/{{{{{\rm{Co}}}}}}}\)

1.19

Sm-Co

31 °C

Sm-rich

\({{{\upalpha }}}_{{{{{{\rm{Sm}}}}}}/{{{{{\rm{Fe}}}}}}+{{{{{\rm{Co}}}}}}}\)

379

   

\({{{\upalpha }}}_{{{{{{\rm{Sm}}}}}}/{{{{{\rm{Co}}}}}}}\)

704

   

\({{{\upalpha }}}_{{{{{{\rm{Fe}}}}}}/{{{{{\rm{Co}}}}}}}\)

13.2

Nd-Fe-B

31 °C

Ln-rich

\({{{\upalpha }}}_{{{{{{\rm{Ln}}}}}}/{{{{{\rm{Fe}}}}}}+{{{{{\rm{Co}}}}}}}\)

48.5

   

\({{{\upalpha }}}_{{{{{{\rm{Fe}}}}}}/{{{{{\rm{Co}}}}}}}\)

1.46

   

\({{{\upalpha }}}_{{{{{{\rm{Nd}}}}}}/\Sigma }\)

3.17

   

\({{{\upalpha }}}_{{{\Pr }}/\Sigma }\)

2.07

   

\({{{\upalpha }}}_{{{{{{\rm{Sm}}}}}}/\Sigma }\)

4.34

   

\({{{\upalpha }}}_{{{{{{\rm{Dy}}}}}}/\Sigma }\)

0.89

  1. Initial leachate compositions are found in Fig. 2b, c and Supplementary Table 1. Product compositions are found in Fig. 3a, b and Supplementary Table 1.
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