|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alumina & Bauxite
||Specific Features of Scandium Behavior during Sodium Bicarbonate Leaching of Red Mud
||Andrey V. Panov, Aleksandr G. Suss, Aleksandr B. Kozyrev, Nataliya V. Kuznetsova, Sergey N. Gorbachev
|On-Site Speaker (Planned)
||Aleksandr G. Suss
Bauxite ore contains ~ 65 % of world Scandium recoverable reserves. Above 96 % of Scandium associated with Bayer extractable alumina passes into red mud. In smelter grade alumina produced from the bauxites Sc2O3 content ranges from 1.2 to 2.3 ppm.
Scandium that is present in red mud after processing of Middle Timan bauxite and Nothern-Ural bauxite has two forms: chemically bound and adsorbed. Sodium bicarbonate digestion tests of scandium from RM showed significant range of values of Sc extraction into the solution (from 10 to 65 %). Beside the form of scandium that is influenced at Bayer process itself, an important factor affecting Sc extraction at red mud processing is secondary losses due to formation of new phases (incl. aragonite, dawsonite, etc.).
The mechanism of Sc secondary losses during sodium bicarbonate digestion of red mud was analyzed, and practices to increase of extraction values were offered.
||Planned: Light Metals