Abstract
The extraction of niobium and tantalum has been studied from oxalic, sulphuric, hydrochloric and hydrofluoric acid solutions, with di-octyl-methylene-bis-phosphonic acid (DOMPA). The results are shown on Figs. 1–5 and Table 1. The metal/ligand ratio was determined in the organic phase and the experiments show that the ratio is not the same for both metals, amounting to 1:2 and 1:1 for niobium and tantalum, respectively. The extraction dependence upon fluoride and oxalate ion concentration was also examined. The extraction mechanism is discussed and the presence of extractable, probably polymeric hydroxo-phosphonic species of niobium and tantalum is deduced from the solvent extraction results.
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