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Extraction of niobium and tantalum isotopes using organophosphorus compounds -- Part II -- Extraction of 'carrier-free' concentrations from HCl/LiCl solutions

Journal Article · · Radiochimica Acta
OSTI ID:1000350
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We have studied the extraction of niobium and tantalum from mixed hydrochloric acid/lithium chloride media by bis(2-ethylhexyl) hydrogen phosphate (HDEHP) and bis(2-ethylhexyl) hydrogen phosphite (BEHP) as a function of hydrogen ion (H+) concentration. The amount of niobium extracted by both HDEHP and BEHP decreased with increasing hydrogen ion concentration. Equilibrium with niobium occurred within 10 s at all hydrogen ion concentrations for both systems. For tantalum, the amount extracted increased until 6 - 9 M H+, before decreasing at higher H+ concentrations when extracted by both HDEHP and BEHP. Equilibrium occurred within 10 s at two H+ concentrations when extracted by HDEHP. The data obtained are used as the basis to discuss the speciation of Nb and Ta under the conditions studied and to evaluate possible extraction mechanisms.
Research Organization:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Organization:
Nuclear Science Division
DOE Contract Number:
AC02-05CH11231
OSTI ID:
1000350
Report Number(s):
LBNL-4056E
Journal Information:
Radiochimica Acta, Journal Name: Radiochimica Acta Journal Issue: 3 Vol. 97; ISSN RAACAP; ISSN 0033-8230
Country of Publication:
United States
Language:
English

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Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
CHLORIDES
HYDROGEN
HYDROGEN IONS
NIOBIUM
Niobium/Tantalum/Liquid-Liquid Extraction/HDEHP/BEHP/Kinetics
PHOSPHORIC ACID
PHOSPHOROUS ACID
TANTALUM
TANTALUM ISOTOPES