Anion Exchange of Zirconium, Hafnium, Niobium and Tantalum in Hydrochloric Acid Solutions

Huffman, E. H.; Iddings, G.M.; Lilly, Robert

doi:10.1021/ja01153a522

Cited by 71 publications

(12 citation statements)

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“…[36,[38][39][40][41][42][43][44][45][46][47] According to Figure 7, La was not absorbed in the range from 0 to 12 mol L À1 HCl. However, Bi absorption reached extremely high values of about 1 mol L À1 HCl.…”

Section: Elimination Of Bi By Anion Exchange Separationmentioning

confidence: 99%

Preparation and Evaluation of High-Purity La2O3

Lee

Uchikoshi

Mimura

et al. 2010

Metall Mater Trans B

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A separation procedure based on extraction chromatography using the di(2-ethylhexyl) phosphoric acid (D2EHPA) impregnated resin, anion exchange with DIAION SA 10 resin, and oxalate precipitation has been developed for the preparation of high-purity La 2 O 3 in hydrochloric acid media at a high La concentration. The metallic impurities Ce, Pr, Nd, Sm, K, Mg, Ca, Zn, Cu, Co, Mn, Pb, Al, In, and Fe, but not Bi, were removed efficiently from La by extraction chromatography using a D2EHPA impregnated resin. The Bi was separated from the La by anion exchange (DIAION SA 10) separation. Thus, a high-purity LaCl 3 solution was obtained by anion exchange separation and extraction chromatography. La 2 O 3 was prepared from the purified LaCl 3 solution by oxalate precipitation. Glow discharge mass spectrometry was applied for purity evaluation of the prepared La 2 O 3 . The purity of the prepared La 2 O 3 was more than 99.9998 pct total rare earth oxide.

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Section: Elimination Of Bi By Anion Exchange Separationmentioning

confidence: 99%

Preparation and Evaluation of High-Purity La2O3

Lee

Uchikoshi

Mimura

et al. 2010

Metall Mater Trans B

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“…2 The sorption of elements from hydrochloric acid solutions on strong base anion-exchange resins. 8,[28][29][30][31][32][33][34][35][36][37] The separation procedure was devised based on Fig. 2.…”

Section: Experimental Methodsmentioning

confidence: 99%

Modeling of Elution Curves in Preparative Chromatography Using Anion-Exchange Resin for Cobalt Purification

2009

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There have been many studies on the modeling of elution and breakthrough curves of ion-exchange chromatography. A precise representation of elution curves using an appropriate mathematical model is significant for the application and expansion of ion-exchange chromatography. The significance of precise modeling particularly increases when the yield and purity of the product are important. However, no previous studies have proposed a model that can perfectly represent experimental elution curves. We investigated the purification of various metals by anion-exchange separation and determined an optimum condition for purification of an element through trial and error. An appropriate model replicating the elution curves accurately is greatly needed to reduce the testing phase. Consequently, this paper proposes a novel model called the plate theory in multi-path mode, in which three virtual paths are assumed. The results show that this model well represents the experimental elution curves. In addition, the model was validated by comparing the distribution coefficients obtained from the fitting results with those determined by previously reported batch experiments.

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“…The separation procedure was devised according to the distribution functions of chemical species on the anion-exchange resin, as determined earlier [15][16][17][18][19][20][21][22][23][24][25] or were obtained from previous reports. [5,6,13] The raw solution for the second step of anionexchange separation in the laboratory-scale experiment contained 20 gAEdm À3 Co(II) (= 0.34 molAEdm À3 ), and the HCl concentration was set at 9 molAEdm À3 .…”

Section: Laboratory-scale Columnmentioning

confidence: 99%

Preparation of High-Purity Cobalt by Anion-Exchange Separation and Plasma Arc Melting

Uchikoshi

Shibuya

Imaizumi

et al. 2009

Metall Mater Trans B

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MASAHITO UCHIKOSHI, HIDEKA SHIBUYA, JUNICHI IMAIZUMI, TAMÁ S KÉ KESI, KOUJI MIMURA, and MINORU ISSHIKI High-purity Co was prepared with valence-controlled anion-exchange separation, oxidation refining using plasma arc melting, and H 2 -Ar plasma arc melting on a pilot scale. The result of a laboratory-scale experiment indicated that the slower flow rate is more effective to remove the impurities by anion-exchange separation. However, the separation efficiency is reduced by scaling up the column from the laboratory to pilot scale. The discussion of the decrease in the separation efficiency implies that the distribution coefficient increases as the concentration of the adsorbate is lowered, but a reduced slower flow rate might increase the final purity of Co. In addition to anion-exchange separation, Co oxidation refining using plasma arc melting was useful. Consequently, a high-purity Co of 99.9998 pct by mass excluding gaseous elements was prepared, which represents the highest purity reported.

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Anion Exchange of Zirconium, Hafnium, Niobium and Tantalum in Hydrochloric Acid Solutions

Cited by 71 publications

References 0 publications

Preparation and Evaluation of High-Purity La2O3

Preparation and Evaluation of High-Purity La2O3

Modeling of Elution Curves in Preparative Chromatography Using Anion-Exchange Resin for Cobalt Purification

Preparation of High-Purity Cobalt by Anion-Exchange Separation and Plasma Arc Melting

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