Liquid–liquid extraction of uranium from Egyptian phosphoric acid using a synergistic D2EHPA–DBBP mixture

Supercritical fluid extraction and purification of uranium from crude sodium diuranate

“…During fertilizer production, phosphoric acid is produced as an intermediate product which contains ppm level of uranium. Several solvent extraction processes have been developed to recover this uranium (Hurst et al, 1972;Bunus, 2000;IAEA Techdoc, 1989;Rawajfeh and Al-Matar, 2000;Singh et al, 2009;Nazari et al, 2004;Singh et al, 2004;Krea and Khalaf, 2000;Abdel-Khalik et al, 2011). Among these processes, solvent extraction using D2EHPA/TBP or D2EHPA/TOPO as extractant is most successful for sustained industrial scale operation (Singh et al, 2007;Singh et al, 2003).…”

The potential for mining trace elements from phosphate rock

“…Many studies have discussed the feasibility of recovery of trace elements, including uranium (Abdel-Khalek et al, 2011;AblowSlama et al, 2014), rare earth elements (Habashi, 1985;Bunuş and Dumitrescu, 1992;Bunuş et al, 1994;Wang et al, 2010;Lokshin et al, 2011), vanadium (Crouse and Brown, 1958;Weterings and Janssen, 1985), magnesium (Liu et al, 2008;Huang et al, 2010), rubidium (Jandov a et al, 2012), and iodine (Yang and Luo, 2013), from PR, phosphoric acids, or other P-related products. Ulrich et al (2014) reviewed past uranium recovery experiences from PR and found that long-term contracts at guaranteed prices are necessary to promote investment and production of uranium from PR.…”

Synergistic extraction of uranium from Korean black shale ore leach liquors using amine with phosphorous based extractant systems

“…A mixture of di-2-ethylhexylphosphoric acid (D2EHPA) and di-butyl butyl phosphonate (DBBP) was used for the synergistic extraction of uranium from an Egyptian phosphoric acid solution. Three extraction stages are required for uranium extraction at A:O 2 with 1.0 mol dm -3 of D2EHPA and 0.5 mol dm -3 of DBBP in a mixture [19]. At a 2.0 mol dm -3 HNO 3 concentration, 0.003 mol dm -3 of PC 88A ?…”