Details

Autor(en) / Beteiligte

• Das, S.
• Behera, S.S.
• Murmu, B.M.
• Mohapatra, R.K.
• Mandal, D.
• Samantray, R.
• Parhi, P.K.
• Senanayake, G.

Titel

Extraction of scandium(III) from acidic solutions using organo-phosphoric acid reagents: A comparative study

Ist Teil von

• Separation and purification technology, 2018-08, Vol.202, p.248-258

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Extraction of Sc(III) has been highly effective with D2EHPA than Cyanex 272.•Slope analysis method suggests cation exchange mechanism of Sc(III) with either of extractants.•Sc(III) enrichment was 12 fold in SX with both D2EHPA and Cyanex 272.•FTIR of the organic phase before and after Sc(III) extraction ensuring about complexation.•Selective separation of Sc(III) from Sc-Mg-Scrap leach solution was resulted. Comparative study for solvent extraction of Sc(III) using two phosphoric acidic reagents such as di-(2-ethyhexyl) phosphoric acid and 2,4,4,tri-methyl,pentyl-phosphinic acid was investigated. Slope analysis method suggests a cation exchange reaction of Sc(III) with both extractants at a molar ratio of extractant: Sc(III) = 2.5:1 at equilibrium pH < 1.5. The plot of log D vs. log [Extractant] yield the slope (n) value as low as n = 1.2–1.3 and as high as n = 7 at low and high extrcatant concentration level, respectively. Extraction isotherm study predicted the need of 2 stages at A: O = 1:4 and A: O = 1:3 using 0.1 M D2EHPA and 0.1 M Cyanex 272, respectively. Stripping of Sc(III) was carried out at varied NaOH concentration to ascertain the optimum stripping condition for effective enrichment of metal. The predicted stripping condition (2)-stages with A: O = 1:3 and 1:4 for D2EHPA and Cyanex 272, respectively) obtained from Mc-Cabe Thiele plot was further validated by 6-cycles CCS study. An actual leach solution of Mg-Sc alloy bearing 1.0 g/L of Sc(III), 2.5 g/L of Mg and 0.2 M HCl was subjected for selective separation of Sc at the optimum condition. The counter current simulation (CCS) study for both extraction and stripping of actual solution resulted quantitative separation of Sc with ∼12 fold enrichment. The organic phase before and after loading of Sc(III) along with the diluents was characterized by FTIR to ascertain the phase transportation of Sc(III).