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Study on separation technology of Pr and Nd in D_2EHPA-HCl-LA coordination extraction system

Journal of Rare Earths 2010年第S1期28卷 111-115页

作者：尹少华吴文远张博张丰云罗瑶李世伟边雪 School of Materials & Metallurgy Northeastern University

The separation coefficient of Nd/Pr was lower in D2EHPA-HCl system. Pointing to this problem,the effect of the acidity of feed and the concentration of lactic acid on the distribution ratio,separation coefficient and extraction capacity was investigated in unsaponified D2EHPA-HCl-LA system,and the regression equations were calculated in this paper. The results showed that the distribution ratio and separation coefficient both increased with decreasing of feed acidity and increasing of the lactic acid concentration,and the extraction capacity increased with increasing of lactic acid concentration in D2EHPA-HCl-LA system. When the pH value of the feed was 3.5 and lactic acid concentration was 0.6 mol/L,the max separation coefficient was 1.57,and the extraction capacity was 27.87 g/L.

关键词： extraction of rare earths coordination extraction distribution ratio separation factors

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Solid-liquid extraction of Gd(Ⅲ) and separphosphoric acid solutions using Tulsion C

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Journal of Rare Earths 2012年第12期30卷 1270-1275页

作者： S.Radhika V.Nagaraju B.Nagaphani Kumar M.Lakshmi Kantam B.Ramachandra Reddy Inorganic Chemistry Division Indian Institute of Chemical Technology(IICT) Rubamin Limited Halol-389 350India

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 concentration, 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 co 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 separated 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.

关键词： gadolinium phosphoric acid Tulsion CH-93 Tulsion CH-90 separation factors rare earths

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