Recovery of neodymium/didymium values from bastnaesite ores

Details Recovery of neodymium/didymium values from bastnaesite ores Recovery of neodymium/didymium values from bastnaesite ores

1987-03-19

1994-08-16

Lewis, Michael

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Rare earth metal

423 215, 423263, C01F 1700

Patent

active

053385209

ABSTRACT:
Neodymium or didymium values are selectively recovered from bastnaesite ores, essentially to the exclusion of cerium and trace amounts of thorium, by (i) calcining the bastnaesite ore, (ii) selectively leaching the calcined bastnaesite with an aqueous solution of nitric acid to solubilize therein neodymium and trivalent rare earth values, and thereby producing an insoluble residue which comprises cerium and thorium values, (iii) separating the insoluble residue, and (iv) liquid/liquid extracting desired neodymium or didymium values from the nitric acid solution.

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