Mundlapudi Lakshmipathi Reddy

Liquid–liquid extraction separation of iron(III) from titania wastes using TBP–MIBK mixed solvent system

The extraction of iron(III) from hydrochloric acid solutions has been investigated using a mixed solvent system consisting of tributyl phosphate (TBP) and methyl isobutyl ketone (MIBK). The results demonstrate that iron(III) is extracted as HFeCl4 with 2 mol of the solvent. Extraction and stripping isotherms were obtained using the solvent mixture consisting of 70 vol.% TBP and 30 vol.% MIBK with a typical solution containing 1 M of iron(III) and 2 M of hydrochloric acid. The potential of the mixed solvent system for the recovery of high purity iron(III) chloride from waste chloride liquors of titanium minerals processing industry has been assessed.

Studies on the liquid–liquid extraction of mercury(II) from acidic chloride solutions using Cyanex 923

Abstract The extraction of mercury(II) from dilute hydrochloric acid solutions has been investigated using Cyanex 923 (=TRPO) as an extractant. The extraction data have been analysed by both graphical and theoretical methods taking into account aqueous phase speciation and all plausible complexes extracted into the organic phase. The results demonstrate that mercury(II) is extracted into xylene as HgCl2·3TRPO. IR spectral studies of the extracted complex were used to further clarify the nature of the extracted complex. The loading capacity of the solvent was determined. The effect of the diluent on the extraction process of mercury has been studied and correlated with dielectric constants. The developed extraction procedure has been explored for the recovery of mercury from the brine–sludge of Chlor-Alkali industry.

Cyanex 471X as extractant for the recovery of Hg(II) from industrial wastes

Abstract The extraction of Hg(II) from hydrochloric acid solutions has been investigated using Cyanex 471X in xylene as an extractant. The results demonstrate that Hg(II) is extracted into xylene as HgCl2·4L (L represents the extractant). The effect of the nature of the diluent on the extraction of Hg(II) with Cyanex 471X has been studied and correlated with the dielectric constant. The loading capacity of the extractant was also determined. IR spectral studies of the extracted complex were used to further clarify the nature of the extracted complex. The potential of the extractant for decontaminating mercury from the brine sludge of a Chlor-Alkali plant has been assessed.