%0 Journal Article
%T Separation of tungsten and rhenium on alumina
%A JURIJ L. VUCINA
%A DRAGOLJUB M. LUKIC
%A MILOVAN SM. STOILJKOVIC
%J Journal of the Serbian Chemical Society
%D 2004
%I Serbian Chemical Society
%X The conditions for the efficient separation of tungsten(VI) and rhenium (VII) on alumina were established. The distribution coefficients Kd for tungstate and perrhenate anions, as well as the separation factors a (a = KdWO42-/Kd ReO4-) were determined using hydrochloric or nitric acid as the aqueous media. A solution of sodium chloride in the pH range 2 6 was also examined. Under all the tested experimental conditions, alumina is a much better adsorbent for tungsten than for rhenium. The obtained results indicated that the best separation of these two elements is achieved when 0.01  0.1 mol dm-3 HCl or 1.0 mol dm-3 HNO3 are used as the aqueous media. If NaCl is used as the aqueous phase, the best separation is achieved with 0.20 mol dm-3 NaCl, pH 4 6. Under these experimental conditions, the breakthrough and saturation capacities of alumina for tungsten at pH 4 are 17 and 26 mg W/g Al2O3, respectively. With increasing pH, these values decrease. Thus, at pH 6 they are only 4 and 13 mg W/g Al2O3, respectively.
%K tungsten
%K rhenium
%K separation factor
%K distribution coefficient
%U http://www.shd.org.yu/HtDocs/SHD/Vol69/No8-9/V69-No8_9-10.pdf