Modeling Adsorption Kinetics of Platinum in a Fixed-bed Column Containing Amine-immobilized Activated Carbons
The concept of adsorption or separation of platinum anions from base metal cations in chloride media using native or chemically modified activated carbons has been discussed in various journals within the context of batchwise systems.In our research work, a fixed-bed column, loaded with native and amine-immobilized activated carbon pellets (Norit RO 0.8), was used to study selective adsorption of platinum ions from chloride media at different flow rates, bed depth and initial metal concentrations.The kinetics, mass transfer characteristics, breakthrough data and separation factors (β(Pt/Fe) and β(Pt/Cr) were quantitatively analysed and modeled. The bed-depth service time (BDST) model was used to model the breakthrough curves successfully in fixed-bed columns and also the dispersive diffusion in the radial and axial directions of the bed were evaluated. The inner diameter of the column was 3 cm and the bed depth was between 1.0 cm and 2.5 cm. Concentrated 4 M HCl acid solution was used to elute the fixed-bed column.It was demonstrated that amine-treated activated carbons provides superior separation factors between platinum and base metals (Fe, Cr). Results showed also, that 95% saturation was reached within 10～26 hours depending on the nature of ACs at a flow rate of 11 mL/min and initial concentration of 5 ppm.
R. K. K. Mbaya H. Kasaini F. Mahange
Department of Chemical & Metallurgical Engineering, Tshwane University of Technology,Arcadia Campus, Pretoria, South Africa
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3085-3096
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）