Concentration of rhenium from dilute sodium chloride solutions

• Published in: Journal of the Serbian Chemical Society 2008, Vol.73 (3), p.333-339
• Main Authors: Lukic, Dragoljub, Vucina, Jurij, Milonjic, Slobodan
• Format: Article
• Language: English
• Subjects: concentration; elution efficiency; elution profile; ion exchange; rhenium
• ISSN: 0352-5139; 1820-7421
• DOI: 10.2298/JSC0803333L

The conditions for the desorption of rhenium from the anion exchange resin Dowex 1-x8 by HNO3, HCl, H2SO4 and NaOH were determined. The solution (5.0?10-3 mol dm-3 Re in 0.15 mol dm-3 NaCl) was passed through a column containing 0.10 g of the resin. The total sorbed amount of rhenium was 0.20 g/g of the resin. It was then eluted by the corresponding eluent in the concentration range up to about 3.0 mol dm-3. The highest elution efficiency and the most favourable elution profile were found with 3.0 mol dm-3 HNO3. Over 77 % of the sorbed rhenium was found in the first 5 ml of the eluate. Practically all the rhenium was recovered with 20 ml of the acid. Under the given experimental conditions, HCl and H2SO4 were less favourable while NaOH was not applicable, due to very low efficiency of rhenium elution. Odredjivani su uslovi desorpcije renijuma sa anjonske izmenjivacke smole Dowex 1-x8 sa HNO3, HCl, H2SO4 i NaOH. Rastvor renijuma (5,0?10-3 mol dm-3 Re u 0,15 mol dm-3 NaCl) je propustan kroz kolonu sa 0,10 g smole. Ukupna sorbovana kolicina renijuma bila je 0,20 g po gramu smole. Renijum je zatim eluiran odgovarajucim eluentom u opsegu koncentracija do 3,0 mol dm-3. Najveca efikasnost eluiranja i najpovoljniji profil eluiranja dobijeni su sa HNO3 koncentracije 3,0 mol dm-3. U prvih 5 ml eluata nalazi se preko 77% sorbovanog renijuma. Prakticno sva kolicina se eluira sa 20 ml kiseline. Pod datim eksperimentalnim uslovima, primena HCl i H2SO4 je manje povoljna dok NaOH nije primenjiv zbog vrlo niske efikasnosti eluiranja.