Liquid–liquid extraction of aluminium(III) from mixed sulphate solutions using sodium salts of Cyanex 272 and D2EHPA

Towards the Utilization of Fly Ash as a Feedstock for Smelter Grade Alumina Production: A Review of the Developments

“…The direct extraction of aluminum by solvent extraction has been examined [41,42]. Preston [42], investigated the ability of carboxylic acids in a xylene diluent to recover aluminum and other metals from nitrate solutions.…”

“…Da Silva et al [43] showed that D2EPHA in n-dodecane was able to extract iron and titanium in sulfuric acid solution with the possibility of recycling the reagents used. However, the selective removal of iron and titanium from aluminumcontaining leach solutions was not possible with D2EHPA due to co-extraction of aluminum [14,41]. Organo-phosphate extractants are also difficult to strip, requiring expensive stripping agents such as fluorine and hydrogen peroxide to improve the stripping kinetics [43,44] hence, their use in the purification of CFA leach solutions is limited.…”

Chemical Kinetics and Reaction Mechanisms in Solvent Extraction: New Trends and Applications

“…64 Liquid-liquid extraction of aluminium(III) from sulphate medium using sodium salt of Cyanex 272 and D2EHPA in kerosene has been studied. 65 Maximum Al(III) extraction was achieved in the equilibrium pH range of 3.2-3.6 and 3.5-4.2 for Na-Cyanex 272 and Na-D2EHPA, respectively. Both extractants can quantitatively and selectively extract Al(III) from a mixed solution of aluminium, cobalt and nickel.…”

Heavy Metal Ion Extraction Using Organic Solvents: An Application of the Equilibrium Slope Method

“…Other applications of this popular extractant include the removal of Cd(II) (Kumar et al, 2009), Zn(II) (Vahidi et al, 2009), Fe(III) and Ti(IV) (Silva et al, 2008); b. Tributylphosphate (TBP), used to act as a phase modifier in Cu(II) extraction (Cheng, 2000). The extractant and phase modifier are diluted at certain ratios in the petroleumbased organic diluents such as kerosene and chloroform (Ak et al, 2008;Ren et al, 2008), cumene (Svendsen et al, 1990), dichloromethane (Memon et al, 2003), isododecane (Mortes and Bart, 2000), n-dodecane (Simonin et al, 2003), n-decanol (Lin et al, 2005), nheptane (Morais and Mansur, 2004), and n-hexane (Valenzuela et al, 2002); c. LIX 84 and Cyanex 272, applied to extract Cu(II), Ni(II), and Al(III) (Mohapatra et al, 2007;Agrawal et al, 2008); d. Cyanex 921, used to extract Cu(II) from HCl (Mishra and Devi, 2011); e. Miscellaneous organic solvents such as I) 1-phenyl-3-heptyl-1,3-propanedione, II) 1-phenyl-4-ethyl-1,3-octanedione, III) 1-(4'-dodecyl) phenyl-3-tert-butyl-1,3-propanedione in kerosene, used to extract Cu(II) (Fu et al, 2011).…”