Neodymium sorption by clay minerals and zeoliferous rocks

Uptake Ability of Zeolitic Rock From South Xerovouni, Avdella, Evros, Hellas

“…The major mineral phase present in the studied samples is found to be HEU-type zeolite, with percentages varying from 42 wt.% (sample X1) to 67 wt.% (sample X4), with an average amount of 57 wt.%. These results are in good agreement with previous studies on the zeolitic tuffs of Metaxades Area, which report an average amount of 58 wt.% in HEU-type zeolite (Marantos et al, 1989;Tsirambides et al, 1989Tsirambides et al, , 1993Tsirambides, 1991;Misaelides et al, 1994aMisaelides et al, ,b, 1995aKoutles et al, 1995;Symeopoulos et al, 1996;Haidouti, 1997;Tserveni-Gousi et al, 1997;Sikalidis, 1998;Yannakopoulos et al, 1998;Vlessidis et al, 2001;Filippidis and Kassoli-Fournaraki, 2002;Katranas et al, 2003;Papadopoulos et al, 2004;Filippidis and Kantiranis, 2005;Kantiranis et al, 2006;Filippidis et al, 2007). In minor amounts plagioclase (5-21 wt.%), K-feldspar (4-19 wt.%), cristobalite (3-17 wt.%), quartz (3-8 wt.%), micas (3-4 wt.%) and clay minerals (4-11 wt.%), were also determined.…”

Lanthanide selective sorbents: self-assembled monolayers on mesoporous supports (SAMMS)

“…Recent examples of how these concepts have been combined include impregnating an ion exchange resin with synergistic lanthanide ligands (e.g. CMPO), 35 carboxylate polymer modified silica for the enrichment and recovery of radioactive lanthanides, 36 pre-concentration of lanthanides from geological sources using silica modified with 1-(2pyridylazo)-2-naphthol derivatives, 37 ion-exchange studies using aminophosphonic acid modified silica, 38 lanthanide sorption onto fulvic acid modified alumina, 39 neodymium sorption by naturally occurring clays and minerals, 40 and sequestration of lanthanides by biopolymer beads composed of alginic acid. 41 These methods are generally based on supports of modest surface area, and hence limited loading capacity.…”

The State of Critical and Strategic Metals Recovery and the Role of Nuclear Techniques in the Separation Technologies Development: Review

“…The study concluded that EHP-OMC demonstrated its viability as a solid phase sorbent for chromatographic lanthanide and intragroup separations. The process/behavior of adsorption of Nd (REE) from aqueous systems can also be conducted using the clay minerals montmorillonite, zeoliferous rock, and kaolinite at 27.5 ± 0.5 • C, using 147 Nd-labeled solutions with concentration ranges of 10 to 450 mg L −1 [151]. The Nd adsorption analysis was conducted in a thermostated bath by agitating 100 mg of the particles with 10 mL of the respective 147 Nd-labeled treatments.…”

“…Following the treatment, the solutions were swirled at 3000 rpm for 30 min, and a particular amount of the clear resulting liquid was quantified in a well-type (3" × 3") NaI (TI) detector linked to a standard γ-ray spectrometry configuration. The uptake of 147 Nd was estimated by subtracting the initial and final count rates [151]. The sorption isotherms for 147 Nd produced for the three core samples revealed that montmorillonite has the greatest absorption ability, with a Cation Exchange Capacity (CEC) of 108 meq/100 g. Nevertheless, based on the materials' CEC, the theoretical yield of 147 Nd sorbed by the zeoliferous and montmorillonite rock samples in the examined concentration range was rather minimal.…”