Purification of niobium using liquid - liquid extraction
DOI:
https://doi.org/10.33448/rsd-v11i9.31880Keywords:
Extraction technology; Niobium; Tantalum; Purification.Abstract
In the present work, we sought to approach the solvent extraction technology for the separation and purification of niobium and tantalum, promoting a reflection in order to expand the chosen theme. Even in the face of a variety of solvents that have been investigated for the extraction and separation of niobium and tantalum, it was possible to find in the literature that only four were used commercially in the production of niobium and tantalum from their raw materials. Solvents commercially used in the extraction were: methyl iso-butyl ketone (MIBK), tri-butyl phosphate (TBP), cyclohexanone (CHN) and 2-octanol (2-OCL). Another verified aspect is that the extraction, separation and purification by solvents of niobium and tantalum used in the industry always occur in the presence of fluoride ions. This study presents the selective removal of niobium (Nb) and tantalum (Ta) by liquid-liquid extraction using an aqueous acid digestion solution composed of commercial grade niobic acid, hydrofluoric acid and sulfuric acid. Solvent extraction assays were tested for three types of extractants, 2-Octanol, TBP and Cyanex 923. A delineated review of the variables of the methodology involved in the separation and purification of niobium and tantalum, as well as the techniques involved, were discussed.
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