Open AccessDiffusion coefficients of trivalent rare earth/actinide ions in acid and alkaline aqueous solutions
Author(s) -
M. S. Liyananadirah,
Mohd Rizauddin Deraman,
W. H. W. Ibrahim,
N. Harun
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/702/1/012045
Subject(s) - reagent , aqueous solution , alkali metal , chemistry , inorganic chemistry , ion , leaching (pedology) , diffusion , thermal diffusivity , actinide , alkaline earth metal , ionic bonding , conductivity , analytical chemistry (journal) , thermodynamics , physics , organic chemistry , geology , soil science , soil water
Leaching is one of the key process of rare earth (RE) element recovery. This paper was set out to validate the effectiveness of acid/alkali in RE leaching by measuring the limiting ionic conductivity (λ o ), self-diffusion coefficient (D i ) and overall diffusion coefficient (D AB ) to obtain a clear insight on the transport properties of ions and salts in aqueous solution. The calculation diffusivity of D i which is diffuse individual ions in pure water and D AB diffuse in chemical reagents were determined using Nernst-Haskell equation, applicable for 25°C. The results of D i were found to be consistent with experimental data from the literature where most of calculation and experiment data are less than 5% error. The final outcome had managed to confirm that NaOH is best reagent for most RE element leaching, which suits the common practice of the industry.