& Leaching – leaching of rare earth ores generally take ammonium sulfate as the leaching solution,
and finally produce a leaching solution containing rare earth mineral ions.Leaching solution
containing rare earth ions
& Extraction – rare earth leaching solution for extraction and separation of metal ions; can be through
the P507 – N235 (trioctyl tertiary amine) rare earth extraction and separation system;
1. Extraction: 507+N235+sulfonated kerosene is used as a complex extractant (organic phase) and
the mixed rare-earth leachate obtained in the first step (aqueous phase) is fully integrated, resulting
in a loaded organic phase (organic phase containing rare-earth ions).
2. Wash: The loaded organic phase is washed by water or acidic solution, mainly to clean the non-rare
earth ions in the organic phase.
3. Re-extraction: The washed loaded organic phase is re-extracted by hydrochloric acid as a re-extractant
to obtain the aqueous phase containing rare earth ions.
& Precipitation: oxalic acid is usually used as a precipitant to precipitate rare earth chlorides
(i.e., the second step extracted solid containing rare earth ions)
& Roasting: Generation of single rare earth oxide products
