3. Different rare earth chemistries
Rare earths can be used in the form of salts, solids, metals and organic complexes.
3.1 Salts
The salts used industrially are nitrates and chlorides of trivalent rare earths, which can be derived directly from separation processes. They come in the form of dried crystals or aqueous solutions at a few moles per liter. In the latter case, the solutions exhibit a slight free acidity (HCl or HNO 3 ). The color of trivalent rare earth salts is related to their 4f-4f transitions: Nd(NO 3 ) 3 mauve, Pr(NO 3 ) 3 green, Dy(NO ...
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Different rare earth chemistries
Industrial processes: from ores to purified raw materials
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