|About this Abstract
||Part C-3: Processing of Critical Metals
||Innovative and Sustainable Valorization Process to Recover Scandium from Canadian Bauxite Residue
||Gisele Azimi, John Anawati, Sable Reid
|On-Site Speaker (Planned)
Bauxite residue is an environmentally hazardous waste product of alumina manufacturing, produced worldwide in large quantities. This material contains 50-100 ppm of scandium, a critical material for the production of stronger, weldable, corrosion resistant, and heat tolerant aluminum products. Aircraft manufacturers are particularly interested in Al-Sc alloys because the ability to employ weldable structures could reduce aircraft weights by 15–20%. Because of its abundance and low cost, bauxite residue has the potential to be used as an efficient feedstock for valorisation processes to recover its scandium content, while in turn degrading this hazardous waste. Here, we developed an efficient process to recover scandium from Canadian bauxite residue with high extraction yields (above 90%), using industrially scalable and economical techniques. This process employs a modified version of sulfuric acid leaching and subsequent impurity removal by selective precipitation. Kinetic reaction and materials characterisation studies were conducted to describe the leaching mechanism.
||Planned: At-meeting proceedings