Kinetics and Mechanism on Removal of Aluminum from Phosphoric Medium by Solvent Extraction using Lewis Cells

Abstract

The kinetics of the forward extraction of aluminum ion had been investigated using Lewis cells. The influences of the aluminum concentration, temperature, and interfacial area were studied. The extracted species was demonstrated to be AlL 3 •(HL) 3 by stoichiometry studies and the mechanism of the extraction was explained. The results indicated that the extraction process was under mixed-control by the extraction reaction at the interface and the diffusion of the resultant in the organic phase. The activation energy was calculated to be 23.26 kJ/mol and was concordant with the mixed-control regime. Further analysis suggested that the reaction orders with respect to aluminum and extractant were 1 and 2, respectively, and the extraction rate constant was 10 −4.526 L 2 •g −2 •s −1 . The total rate of the extraction reaction for AlL 3 •(HL) 3 was given based on kinetic steps.

Recovery of Iron Resources from Wet-Process Phosphoric Acid and the Preparation of High Purity Ferrous Oxalate: Solvent Extraction and Photochemical Reaction

“…The recovery of metal resources in phosphate rock conforms to green chemistry . The solvent extraction method is commonly applied to hydrometallurgy, because of the advantages of low energy consumption, low pollution, and high separation efficiency, such as removing Fe from WPA. − However, due to the strong bonding ability of the extractant for Fe­(III), it is difficult to strip Fe­(III) from the extractant even with a highly concentrated inorganic strong acid solution. , Under these circumstances, oxalic acid was used to strip Fe­(III) because of its strong complexing ability . Oxalic acid showed an excellent stripping effect, but it is expensive .…”