I know magnetic separation can separate Fe, γ-Fe2O3, Fe3O4. But I don't know how to get Fe powders from residues. Someone say sodium pyrophosphate could remove γ-Fe2O3, Fe3O4, is it a feasible method ? Or other better method?
Thanks very much for your answers!
You can try it with a chemical extraction or density fractionation.
With the chemical extraction you would try to dissolve your target iron oxides, though the possibility exists that your elemental iron could also be attacked.
(Na pyrophosphate is used in this context to dissolve organic Fe complexes.)
For this, I recommend the review of Voelz, et al. (2019)
10.1021/acsearthspacechem.9b00012
Otherwise you could try to seperation via density with Na polytungstate or NaI. Though if your Fe oxides are encrusted on the iron powder, seperation would be difficult since these would coprecipitate.
Hi you should dissolve your target iron oxides, though the possibility exists that your elemental iron could also be attacked.
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