Process Flowsheet Development for Separation of Sm, Co, Cu, and Fe from Magnet Scrap.

ABSTRACT: A complete process flowsheet to recover metal values from Sm₂Co₁₇-type magnet scrap was investigated. The magnet scrap was leached in chloride medium at pulp density of 2% (w/v) under the optimum conditions of 15% (v/v) HCl and 5% (v/v) H₂O₂ at 70 °C for 3 h, which yielded 98.5% Sm and 99% Co extractions. The full factorial Design of Experiment technique was adopted for the optimization of leaching conditions. Sm was selectively separated from the leach liquor as precipitated double salt using Na₂SO₄. The precipitated double sulfate was later converted to Sm-oxalate, which was subsequently calcined to produce pure Sm₂O₃. Following Sm separation, Fe was removed through precipitation by raising the pH to

SUBMITTER: Nayak AK 

PROVIDER: S-EPMC7807480 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature