Recovery of lanthanides from kola apatite in phosphoric acid manufacture

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Abstract
The paper presents the results of bench‐scale studies for the recovery of lanthanides from Kola apatite in the phosphoric acid production by a two‐stage hemihydrate‐dihydrate wet‐process. The second stage of the process (hydration of hemihydrate) provides the best conditions for the recovery of lanthanides. In the postulated recovery process use is made of solvent extraction for the removal of lanthanides during hydration of hemihydrate, and precipitation‐stripping for the removal of lanthanides from the solvent. Lanthanides are recovered in the form of Ln‐enriched concentrates with an efficiency of 80–85%. The process does not disturb the phosphoric acid production, and additionally purifies the by‐product gypsum, so that it can be utilized.

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