Solid-liquid extraction of Gd(Ⅲ) and separphosphoric acid solutions using Tulsion C |
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作者姓名: | S.Radhika V.Nagaraju B.Nagaphani Kumar M.Lakshmi Kantam B.Ramachandra Reddy |
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作者单位: | Inorganic Chemistry Division,Indian Institute of Chemical Technology(IICT);Rubamin Limited,Halol-389 350,India |
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摘 要: | Solid-liquid extraction of gadolinium was investigated from phosphoric acid medium using commercial amino phosphonic acid resin, Tulsion CH-93. The experimental conditions studied included equilibration time, acid concentration, mass of the resin, metal concentra-tion, loading and elution. The percent extraction of Gd(Ⅲ) was studied as a function of phosphoric acid (0.05-3 mol/L) using Tulsion CH-93 resin. The corresponding lgD vs. equilibrium pH plot gave straight line with a slope of 1.8. The percent extraction decreased with acid con-centration increasing, conforming ion exchange mechanism. Under observed experimental conditions the loading capacity of Tulsion CH-93 for gadolinium was 10.6 mg/g. Among several eluants screened, the quantitative elution of Gd(Ⅲ) from loaded Tulsion CH-93 was obtained with ammonium oxalate (0.15 mol/L). The extraction behavior of commonly associated metals with gadolinium was studied as a function of phosphoric acid concentration. Tulsion CH-93 resin showed selective extraction towards heavy rare earths (Lu and Yb) which could be sepa-rated from other rare earths at 3 mol/L H3PO4, similar to wet phosphoric acid (3-5 mol/L). On the other hand Gd(Ⅲ) and other rare earths were studied with chelating resin Tulsion CH-90. Light rare earths were highly extracted and these could be separated from heavy rare earths and Gd.)
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关 键 词: | gadolinium phosphoric acid Tulsion CH-93 Tulsion CH-90 separation factors rare earths |
收稿时间: | 2012-08-21 |
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