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- Title
Extraction of aluminum and iron from bauxite: A unique closed‐loop ore refining process utilizing oxalate chemistry.
- Authors
Verma, Ankit; Corbin, David R.; Shiflett, Mark B.
- Abstract
The Bayer process holds an exclusive status for alumina extraction, but a massive amount of caustic "red mud" waste is generated. In this work, three oxalate reagents: potassium hydrogen oxalate (KHC2O4), potassium tetraoxalate (KHC2O4·H2C2O4), and oxalic acid (H2C2O4) were investigated for the Al and Fe extraction process from NIST SRM 600 Australian‐Darling range bauxite ore. More than 90% of Al and Fe was extracted into the aqueous phase in less than 2 h with 0.50 M C2O42− for all three reagents. The Fe and Al can be selectively precipitated by hydrolyzing the aqueous phase. By acidifying the Al and Fe free filtrate, 80% of the C2O42− can be precipitated as KHC2O4·H2C2O4. Greater than 90% of the aqueous acid can also be recycled using a cation‐exchange resin. The proposed closed‐loop process is an energy‐efficient, cost‐effective, environmentally–friendly route for extracting Al and Fe from bauxite ore.
- Subjects
NATIONAL Institute of Standards &; Technology (U.S.); BAUXITE; OXALIC acid; BAYER process; ORES; ALUMINUM
- Publication
AIChE Journal, 2022, Vol 68, Issue 2, p1
- ISSN
0001-1541
- Publication type
Article
- DOI
10.1002/aic.17477