Liquid-Liquid Extraction of Iron (III) from Hydrochloric Acid Solutions by .ALPHA.-Hydroxyoxime.

Abstract

The extraction of iron (III) from hydrochloric acid solutions has been investigated using LIX 63 (5, 8 -diethyl -7 -hydroxy -6 -dodecanone oxime, HR) in kerosene under different conditions. The organic extracts were examined by infrared and ultraviolet spectroscopies. As the results, the following equilibrium equations are proposed: at 2 > pH > 1, Fe The development of commercial and chelating extractants has stemmed from the need to provide alternative process options for the treatment of dilute copper bearing acidic leach liquors. Especially the hydroxyoximes extract copper selectively from dilute acid leach liquors.The extraction of metal ions from aqueous solutions by a -hydroxyoximes, such as 5, 8 -diethyl -7 -hydroxy -6 -dodecanone oxime (HR, the active component of LIX 63) and its analogues, has been reported previously 1)2) . Our studies have also been conducted on the complexes formed in the extraction of copper from hyorochloric acid solutions by an a -hydroxyoxime, and in addition the extraction of divalent cobalt, nickel and copper and trivalent gallium, indium and thallium 3)-5) . In the present paper, therefore, the work is extended to the extraction of iron (III) from hydrochloric acid solutions by a -hydroxyoxime. Despite the fact that the discrimination of LIX 63 for copper over ferric ion is not so good as required 1 ), the information on the extraction of iron (III) by LIX 63 is little submitted until now. Thus the study on such extraction system is necessary to inquire into its cause and accordingly to elucidate the elevation of the discrimination. LIX 63 (Henkel Corp.) used as an a -hydroxyoxime was purified by the method according to earlier paper 6) , and diluted with purified kerosene. Aqueous solutions of iron were prepared by dissolving ferric chloride (FeCl 3 ・6H 2 O) in hydrochloric acid of the required concentration. In general the aqueous metal concentration was 1 g dm -3 ferric chloride except for the loading test. Other chemicals were of analytical reagent grade. 2・2 Extraction and analytical proceduresEqual volumes (15 cm 3 each) of the aqueous and organic phases were shaken for 20 min in 50 cm 3 stoppered conical flask at 293 K. Preliminary experiments showed that equilibration was complete in 20 min. The mixture was centrifuged and separated, and then the aliquots of both phases were pipetted out to determine the distribution coefficient (E o a the ratio of the equilibrated concentration of metal in organic phase to that in aqueous phase). Iron was stripped from the organic phase with 1 mol dm -3 hydrochloric acid solution. The concentration of iron in aqueous solution was determined by EDTA titration using xylenol orange (XO) as indicator. The chloride concentration and the water content of the organic phase were determined by the use of Volhard's method and Karl Fischertitration, respectively. 2・3 IR and UV spectral measurementsThe infrared (IR) spectra of the organic extracts were determined on JASCO models IRA -1 (4000 -650 cm -1 ) and IR -F (700 -200 cm -1 ) using a capi...

Liquid-liquid Extraction of Iron (III) from Hydrochloric Acid Solutions by Tributyl Phosphate.

“…In contrast, as shown in Fig.7, the spectra of the organic extracts show the absorption bands at 316 and 364 nm similar to the pattern of the aqueous ferric chloride solutions in 5 -9 mol dm -3 HCl. The author has also observed the analogous absorptions to the organic extracts from hydrochloric acid solutions at higher acitities by -hydroxyoxime 1) and , respectively).…”

“…Therefore numerous reseachers have studied on solvent extraction of iron (III) from acid solutions. However, since there are few investigations to clarify the extraction mechanism of iron (III), the present author has engaged systematically in the fundamental study on solvent extraction of iron (III).The extraction of iron (III) from hydrochloric acid solutions by -hydroxyoxime, such as 5, 8-diethyl-7-hydroxy-6-dodecanone oxime (HR, the active component of LIX 63), has been reported previously 1) , because the information on the extraction of iron (III) by LIX 63 was little submitted, despite the fact that the discrimination of LIX 63 for copper over ferric iron was not so good as required. Furthermore, when dihexyl sulphoxide (DHSO) is used as an effective extractant for precious metal such as mercury, the problem to separate precious metal from iron (III) has been investigated in the extraction system from chloride media 2) .…”

“…by Taichi SATO 1 The extraction of iron (III) from hydrochloric acid solutions has been investigated using tributyl phosphate (TBP) in benzene under different conditions. The organic extracts were examined by infrared and ultraviolet absorption spectroscopies.…”