Abstract
ABSTRACTIn this study, the mechanism of Fe3+ ion extraction was investigated in the tri-n-butyl phosphate (TBP)/triethyl-pentyl-phosphonium (P2225) bis(trifluoromethyl-sulfonyl)amide (TFSA) system. According to the performed analysis, the Fe3+ extraction is based on cation exchange with ionic liquids:Moreover, the removal of Fe and B by continuous extraction was investigated. It was determined that nine extraction cycles led to the removal of all B and most of the Fe and increased the concentration of rare earth ions in the organic phase by a factor of 2.2.The electrochemical behavior of the extracted [Fe(III)(TBP)3(TFSA)3] complex was investigated at 373 K, and two reduction steps were detected:Based on these results, potentiostatic electrodeposition from an electrolytic bath was carried out at −1.75 V at 373 K after the ninth cycle of continuous extraction. Electrodeposits with 0.8–0.9 μm diameter were recovered on the Cu substrate, and metallic Fe in these deposits was identified by their energy dispersive X-ray spectrometry (EDX) spectra. Finally, the effectiveness of solvent extraction and direct electrodeposition in the recovery process was demonstrated in this study.
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