|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Solvo-chemical Recovery of Cerium from Sulfate Solution using Cyanex 923 and Oxalate Precipitation
||Sadia Ilyas, Hyunjung Kim, Rajiv Ranjan Srivastava
|On-Site Speaker (Planned)
The solvo-chemical recovery of Ce(IV) from sulfate leach liquor was investigated using Cyanex 923 in kerosene. The quantitative solvation of Ce(IV) could be achieved by performing three-stages of counter-current extraction at an organic-to-aqueous phase ratio of 2:3, while using 0.15 mol/L Cyanex 923 into the organic phase. The spectroscopy analysis of the organic phase revealed the formation of solvated species ¯([〖〖Ce(SO〗_4)〗_2 ].2[Cyanex 923].[HSO_4^-]) into the organic phase. Stripping of Ce(IV) in its reduced form as Ce(III) was conducted in H2SO4+H2O2 solution that yielding 1.3 g/L Ce(III) back into the aqueous phase. Finally, the recovery of rare metal was conducted via Ce(III)-precipitation with oxalic acid, which exhibited different characteristics with changing temperatures. Precipitation kinetics showed good fits to the Avrami equation, while the determined activation energy (Ea, 8.6 kJ/mol) indicated to follow a diffusion-controlled mechanism.