Separation of Rare Earth Elements by Ion Exchange.

Separation of Rare Earth Elements by Ion ... the influent eluting solution ph must be such that la edta chelate does not precipitate in the column and low ...

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Patent US3167389 - Ion exchange process for separating the ...

The purpose of the rare earthlretainer, band in theV methodof the present inventionY isV solely to maintain the band vlengthof the rare earths being pur-ied by removing` the rare earths'.l absorbed in the eluting solutionrby -an exchange of the n eluting agent ions with those selected to constituteA thel retainer.

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US3455646A - Method of separating yttrium from rare earths ...

The eluting solution containing the HEDTA salt is then ... An yttrium-rare earth concentrate used to prepare the feed solution in this example was a concentrate ...

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Displacement Chromatography of the Rare-Earth Elements

eluting solution with 15 g/liter EDTA was due to precipitation of ... Amino Acids as Retaining Agents in Displacement Chromatography of the Rare-Earth Elements ...

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1.1. Chemistry of Rare Earths - Shodhganga

Chemistry of Rare Earths Rare earth metals comprise of elements that are part of the lanthanides in the periodic ... The eluting agent is a complexing agent.

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Displacement Chromatography of the Rare-Earth Elements

eluting solution with 15 g/liter EDTA was due to precipitation of ... Amino Acids as Retaining Agents in Displacement Chromatography of the Rare-Earth Elements ...

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The influence of a competing eluting ion ... - SpringerLink

The separation of rare-earth metals (REMs) by displacement complex forming chromatography was studied for S-shaped isotherms of the eluting ion with eluted elements. It was found that sodium competing ions, which entered the REM zone, decelerated ion exchange of REMs.

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Drug-Eluting Stent Update 2007 | Circulation

Drug-Eluting Stent Update 2007 ... (contains 2% aluminum and 1% rare earth metals) with an expected 50% loss of mass within 6 months in 11 domestic pigs ...

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Application of Mg-based alloys for cardiovascular stents ...

In vitro cell culture with rare earth chlorides showed that most rare earth elements have obvious effect on viability of human umbilical cord perivascular cell at concentrations over 1000 µg/mol (Feyerabend et al., 2010).

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Praseodymium - Wikipedia

It is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. Praseodymium is a soft ... eluting from heaviest ...

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The use of chelating agents in the separation of the rare ...

The use of chelating agents in the separation of the rare earth elements by ion-exchange methods ... eluting a band of mixed rare earths, ...

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Extraction of rare earths from the leach liquor of the ...

Extract rare earths from the leach liquor with ion exchange. The rare earth concentration in the leach liquor of the weathered crust elution-deposited rare earth ore is very low, about 0.5–1 g/L. Extraction of rare earths from the leach solution with ion exchange is available. 2.2.1.

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rare earths element - hospitalityworld

Talk:Rare-earth element - Wikipedia. ... rare earth eluting; rare earth fractionation; rare earth metals process equipment; rare rocks and minerals for sale;

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OSA | Determination of Traces of Certain Rare Earths in ...

The negatively charged uranium fluoride complex passed through the column while the rare earths were retained. After the residual uranium was completely removed by eluting with 2.5 M hydrofluoric acid, the resin bed was ignited, and the resulting ash analyzed spectrographically for the individual rare earth elements.

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The Influence of a Competing Eluting Ion Content on the ...

It is known that, in the separation of rare-earth met-als ... ents, the eluting (sodium) ion enters the zone of ele-ments to be separated because of the S-shaped ion

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WO/2008/108888 SEPARATION OF RADIUM AND RARE EARTH ...

separation of radium and rare earth elements from monazite Abstract: A method of chemically extracting radium-228, rare earth metals, thorium, the decay products of thorium, and phosphates from thorium-containing ores.

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The influence of a competing eluting ion content on the ...

The separation of rare-earth metals (REMs) by displacement complex forming chromatography was studied for S-shaped isotherms of the eluting ion with eluted elements. It was found that sodium competing ions, which entered the REM zone, decelerated ion exchange of REMs.

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ETHYLENE DIAMINE TETRAACETIC ACID AND CITRIC ACID AS ...

NH4+ ions) the following procedure was adopted. The rare earth was adsorbed onto a small columll of Zeokarb in the NH4+ form. After it had beell washed with water it was eluted from the column with stock EDTA at pH 5. This eluate was mixed with stock EDTA at pH 3.5 to yield a rare-earth concentra- tion of about lo-' to lop5 M.

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ANALYSIS OF RARE EARTH ELEMENTS IN PERIDOTITIC ROCKS

small amounts of the rare earths and hygromagmaphile elements. ... used as the eluting agent and the effluent is collected in 100 cm 3 PTFE beakers.

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Selective separation of rare earth elements by ion ...

A process as set forth in claim 1, wherein an EDTA containing one rare earth element is mixed with a mineral acid to reduce its pH to between 1.5-0; precipitating the EDTA for recycling; adding oxalic acid to the precipitate to precipitatethe rare earth; and washing the rare earth precipitate with NaOH solution to recover the oxalic acid.

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The use of chelating agents in the separation of the rare ...

The use of chelating agents in the separation of the rare earth elements by ion-exchange methods ... eluting a band of mixed rare earths, ...

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rare earth western - hospitalityworld

China Said to Expand Rare Earths Embargo to West - Oct 19, 2010· China mines 95 percent of the worlds rare earth elements, which have broad commercial and military ...

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Observations on the rare earths. I. Ion exchange studies ...

Book: Observations on the rare earths. I. Ion exchange studies on thorium-rare earth mixtures. II. ... The following eluting agents were investigated: ...

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Mutual Separation of Rare Earths in Monazite with Cation ...

By gradiently increase of the pH values from 3 to 5 in 0.3 M α-HIBA eluting solution, complete mutual separation of individual rare earth elements, exception of Dy and Y, were obtained.

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ANALYSIS OF RARE EARTHS IN EUDIALYTE - McMaster University

Elution rates of the Rare Earths were determined by eluting through the column a sample of eudialyte of approximately 0.3 grams spiked with tracers of radio-active . La. 140 : and Yb . 175 • Since Yb is the first Rare Earth to come off the column and La is the last, it was possible to draw up elution curves for the Rare Earth elements.

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EFFECT OF RESIN ON ABSORBING RARE EARTH ELEMENTS FROM ...

result of the eluting process unless rare earth elements are absorbed correctly by resin. Table 1: ...

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Patent US3228750 - Process for separating rare-earth ...

The rare earths are eluted from the first resin bed in the form of rare earth-EDTA complexes and these complexes then exchange with the hydrogen ions on the second resin column resulting in separation of the rare earths into individual bands on the second column.

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Elution of copper and neodymium from a cation-exchange ...

exchange resin with ammonia-ethylenediaminetetraacetic acid solutions ... Resin with Ammonia-Ethylenediaminetetraacetic Acid ... eluting the rare earths down ...

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Selective separation of rare earth elements by ion ...

I claim: 1. An ion exchange process for selectively eluting rare earth elements comprising, the steps of: preparing an ion exchange separation column ...

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Selective separation of rare earth elements by ion ...

I claim: 1. An ion exchange process for selectively eluting rare earth elements comprising, the steps of: preparing an ion exchange separation column ...

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The influence of a competing eluting ion ... - SpringerLink

The separation of rare-earth metals (REMs) by displacement complex forming chromatography was studied for S-shaped isotherms of the eluting ion with eluted elements. It was found that sodium competing ions, which entered the REM zone, decelerated ion exchange of REMs.

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rare earths in rats - Journal of Lipid Research

rare earths in rats FRED SNYDER, ... nificantly altered by the rare-earth treatment. ... and methanol were used as eluting solvents, ...

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Selective separation of rare earth elements by ion ...

Selective separation of rare earth elements by ion exchange in an iminodiacetic resin Inventor: Moore Date ... eluting rare earth elements ...

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Process for the separation and purification of rare-earth ...

The present invention relates to a process for the separation and purification of rare-earth metals according to which a dilute solution of rare-earth metals (16 ...

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In vitro and in vivo degradation of rapamycin-eluting Mg ...

The 3-month in vivo study on the RAPA-eluting JDBM stent implanted into porcine coronary arteries confirmed its ... Oxides Rare Earths Semiconductors Solutions ...

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Bioresorbable stent - Wikipedia

The use of metal drug-eluting stents presents some ... Like metal stents, placement of a bioresorbable stent will restore blood flow ... of magnesium–rare-earth ...

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ETHYLENE DIAMINE TETRAACETIC ACID AND CITRIC ACID AS ...

ETHYLENE DIAMINE TETRAACETIC ACID AND CITRIC ACID AS ELUANTS IN ION EXCHANGE SEPARATION OF RARE EARTHS' ... rare earths by eluting with solutions of progressively ...

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