NS  Vol.4 No.12 , December 2012
Heavy metal extraction by a counter-flow moving bed reactor
Abstract: In the current study, the extraction of heavy metal ions (Zn2+, Cu2+ and Cd2+) is suggested to be achieved by a counter-flow moving bed reactor. The studies are made at high (1 × 10-2 M) and low (1 × 10-4 M) initial concentrations of the heavy metal ions. Theoretical and experimental studies are made on the extraction of the metal ions with impregnated Amberlite resins, prepared by sorption of an organic extractant into the resin. The study suggests structural, kinetic and hydrodynamic parameters that shall be investigated prior to the design of a moving bed reactor. The effect of these parameters on the adsorption extent is theoretically investigated through the proposed model. Analyses of the experimentally estimated external, internal and chemical rate parameters show that the process is controlled by chemical reaction in both concentrations as the chemical reaction rate parameter is significantly smaller than both the internal and the external diffusion rate parameters.
Cite this paper: Ali, A. , Abdelaziz, M. , Elbakhshawangy, H. and Othman, S. (2012) Heavy metal extraction by a counter-flow moving bed reactor. Natural Science, 4, 992-1001. doi: 10.4236/ns.2012.412128.

[1]   Othman, S.H., Shabaan, M., Demerdash, M. and Saleh, M.M. (2009) Experimental and theoretical investigation of sorption kinetics of beryllium on Amberlite-IR-120 sorbent. Journal of Nuclear Materials. 392, 427-433. doi:10.1016/j.jnucmat.2009.04.001

[2]   Othman, S.H., Sohsah, M.A., Ghoneim, M.M., Sokkar, H.H., Badawey, S.M. and El Anadouli, B.E. (2006) Mathematical Simulation of Hazardous Ion Retention from Radioactive Waste in a Fixed Bed Reactor. Industrial & Engineering Chemistry Research, 45, 2808-2817. doi:10.1021/ie0507676

[3]   Othman, S.H., Ali, A.H., Mansour, N.A. and El Anadouli, B.E. (2012) The effect of external and internal diffusion on the sorption of radioactive ions by reactive cloth filter, part I. Journal of Radioanalytical and Nuclear Chemistry, 291, 685-698. doi:10.1007/s10967-011-1421-3

[4]   Othman, S.H., Saleh, M.M., Demerdash, M., El Anadouli, B.E. (2010) Mathematical model: Retention of beryllium on flow-through fixed bed reactor of Amb-IR-120. Chemical Engineering Journal, 156, 157-164. doi:10.1016/j.cej.2009.09.018

[5]   Ali, A.H. and Othman, S.H. (2011) A physico-chemical parametric study on the retention of radioactive ions in a fixed bed reactor. Chemical Engineering Journal, 178, 375-383. doi:10.1016/j.cej.2011.10.030

[6]   Flett, D.S. (1977) Resin impregnates: the current position. Chemical Industries, 641-646.

[7]   Tavlaride, L.L., Bae, J.H. and Lee C.K. (1987) Solvent extraction, membranes, and ion exchange in hydrometallurgical dilute metals separation. Separation Science and Technology, 22, 581-617. doi:10.1080/01496398708068970

[8]   Warshawsky, A. (1981) Extraction with solvent-impregnated resins. Ion Exchange and Solvent Extraction, 8, 229-310.

[9]   Cortina, J.L., Miralles, N., Sastre, A., Aguilar, M., Profumo, A. and M. Pesavento (1993) Solvent impregnated resins containing di(2,4,4-trimethylpentyl)phosphinic acid. I. Comparative study of di(2,4,4-trimethylpentyl)phosphinic acid adsorbed on Amberlite XAD-2 and dissolved in toluene. Reactive Polymers, 21, 89-101.

[10]   Cortina, J.L., Miralles, N., Aguilar, M. and Sastre, A.M. (1994) Solvent impregnated resins containing di(2-ethylhexyl)phosphoric acid. I. Preparation and study of the retention and distribution of the extractant on the resin. Solvent Extraction and Ion Exchange, 12, 349-369. doi:10.1080/07366299408918214

[11]   Cortina, J.L., Miralles, N., Sastre, A., Aguilar, M., Profumo, A. and Pesavento M. (1993) Solvent impregnated resins containing di(2,4,4 trimethylpentyl)phosphinic acid. II. Study of the distribution equilibria of Zn, Cu and Cd. React. Polymer, 21, 103-116. doi:10.1016/0923-1137(93)90057-M

[12]   Cortina, J.L., Miralles, N., Aguilar, M. and Warshawsky, A. (1995) Solid-liquid distribution studies of divalent metals from nitrate media using impregnated resins containing a bifunctional organophosphorous extractant (o-methyldihexylphosphine oxide o’-hexyl-2-ethylphosphoric acid). Reactive and Functional Polymers, 27, 61-73. doi:10.1016/1381-5148(95)00035-E

[13]   Helfferich, F. (1962) Ion exchange. MaGraw-Hill, New York, 250-266.

[14]   Liberti, L. and Passino, R. (1977) Ion-exchange and solvent extraction. Marcel Dekker, Inc., New York, 3.

[15]   Juang, R.S. and Lin H.C. (1995) Metal sorption with extractant-impregnated macro-porous resins. 2. Chemical reaction and particle diffusion kinetics. Journal of Chemical Technology & Biotechnology, 62, 141-147. doi:10.1002/jctb.280620205