Ion exchange recovery of rhenium from industrially relevant sulfate solutions: single column separations and modeling
Virolainen, Sami; Laatikainen, Markku; Sainio, Tuomo (2015)
Post-print / Final draft
School of Engineering Science
The ability of the anion exchangers to adsorb Re from concentrated sulfate solutions is related to the size and degree of hydration of perrhenate anion, ReO4−. Especially high Re equilibrium capacities of the Purolite A170 and gel-type A172 resins are related to their complex amine functional group, which favors less charged and more hydrophobic anions. However, the functionality did not explain the superior Re/Mo selectivity of the A172 resin detected especially in dynamic column experiments. Diffusion coefficients of all components were remarkably low in A172, and the measured moisture content of the resin was also low. These observations lead to a conclusion that the physical structure of the A172 is so dense that Mo species can only enter near the surface of the resin particle, which is the cause to a low uptake. Both of the Purolite resins also had a good Re/As selectivity, and are well suited for recovering Re from acidic sulfate solutions not containing Mo that are common in industrial applications.
Virolainen, S., Laatikainen, M., Sainio, T., 2015. Ion exchange recovery of rhenium from industrially relevant sulfate solutions: single column separations and modeling. Hydrometallurgy 158, 74–82. doi:10.1016/j.hydromet.2015.09.026
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