Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6658853 | Hydrometallurgy | 2018 | 38 Pages |
Abstract
This paper presents the results of laboratory studies for the recovery of rare earth elements from an apatite ore sample by using sulphuric acid leaching, solvent extraction, and precipitation processes. Results showed that the most effective dissolutions of light REEs (>85%) and heavy REEs (>89%) from the apatite ore sample were achieved with a dilute sulphuric acid solution (1â¯M H2SO4) at a temperature of 20â¯Â°C in an hour. The heavy REEs present in the pregnant leach solution were almost entirely extracted using 1.2â¯M di-(2-ethylhexyl) phosphoric acid (D2EHPA) as a cation exchanger, while the most light REEs remained in the raffinate. The heavy REEs loaded into the organic phase were stripped completely by 3â¯M H2SO4 solution. REEs remained in raffinate and stripped into the aqueous solution were precipitated as RE oxalates by the addition of 0.08â¯M oxalic acid.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Ariuntuya Battsengel, Altansukh Batnasan, Ariunbolor Narankhuu, Kazutoshi Haga, Yasushi Watanabe, Atsushi Shibayama,