An XAFS Study of Tantalum Chloride in the Ionic Liquid 1-Ethyl-3-Methyl Imidazolium Chloride/Aluminum Chloride

Donald Roeper, Kumi Pandya, Graham T. Cheek, William O'Grady
2010 unpublished
The decomposition of the Ethiopian Kenticha tantalite ore was studied using the KOH fusion and H 2 O leaching system at 400 0 C for a 1 h reaction time. The experimental results obtained showed that 27 wt% of Ta 2 O 5 was mainly transformed into insoluble KTaO 3 , not to be KNbO 3 , and as well, into the dissolved liquor containing 94.73 vol% of Nb 2 O 5 and 75.80 vol% of Ta 2 O 5 . The observations, supported by the EDXRF, XRD, and ICP-OES techniques, showed that the ratio of the dissolved
more » ... f the dissolved mixture of Nb and Ta metal ions was beneficial to the solvent extraction from both Ta 2 O 5 and Nb 2 O 5 . Niobium and tantalum were extracted from their neutralized alkaline dissolved and hydrolyzed solution by a new process using the EMIC/AlCl 3 ionic liquid as the extractant using selective stripping, precipitation, and calcination of a highly crystalline pure 99.84 wt% of Nb 2 O 5 and amophours 90.81 wt% of Ta 2 O 5 . The compositions of the dissolved metal ions and solids were analyzed by the ICP-OES, EDXRF, XRD, and FT-IR techniques.
doi:10.1149/1.3491279 fatcat:mnr3x5ukije5zgxjychf2xki7a