Abstract
The niobium-tantalum ore material obtained from Ras Baroud locality in the central Eastern Desert of Egypt, consists mainly of two minerals namely: columbite and alvarolite. The extractive separation of niobium(V) and tantalum(V) from the acid media HF-HNO3or HF-H2SO4 have been worked out using methyl isobutyl ketone (MIBK) as an extractant. The extraction system HF-H2SO4-MIBK proved to have the most promising separation effect with the highest purity of each niobium and tantalum oxides. The optimum loading conditions in HF-H2SO4-MIBK system were: O/A = 10/1.15 minutes contact time, 100% MIBK. while the feed solution assayed 4.3 N HF and 5.7 N H2SO4. Moreover, the stripping process was performed with 1.0 N HF and distilled water in subsequent steps.
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