Equilibrium and kinetic data of adsorption and separation for zirconium and hafnium onto MIBK extraction resin
来源期刊：中国有色金属学报(英文版)2010年第8期
论文作者：徐志高 吴延科 张建东 张力 王力军
文章页码：1527 - 1533
Key words：equilibrium; kinetics; adsorption; methyl isobutyl ketone; extraction resin; zirconium; hafnium; separation
Abstract: The equilibrium and kinetics of methyl isobutyl ketone (MIBK) extraction resin for adsorption and separation of zirconium and hafnium were studied under the different conditions of acidity, initial total concentrations of zirconium and hafnium and temperature. The equilibrium data of both zirconium and hafnium are found to follow the Freundlich adsorption isotherm, and the Freundlich isotherm constants (KF) are 3.53 and 0.64 mg/g, respectively. The equilibrium data of zirconium also fit the Langmuir adsorption isotherm, and the saturation adsorption capacity (Qmax) and the Langmuir isotherm constant (KL) are 75.93 mg/g and -0.012 7 L/g, respectively. The obtained kinetic data of both zirconium and hafnium are found to fit the HO pseudo-second-order kinetic model, and the rate constants of pseudo-second-order equation (k2) are -0.019 and 0.41 g/(mg·min), respectively. Column tests show that the MIBK extraction resin could be used as efficient adsorbent material for separating hafnium from zirconium.
