title: Studies on solvent extraction of iron(III) as a step for conversion of a waste effluent to a value added product.
abstract: Solvent extraction of iron(III) from actual sulphate waste pickle liquor was investigated using trialkylphosphine oxide diluted with kerosene. The waste pickle liquor was procured from a local company which deals with the manufacturing of pipes and tubes made of iron and steel. Various parameters were studied to optimise a suitable condition for the maximum extraction of iron. The composition of the aqueous feed used in the experiment was 60.88 g/L Fe(III), 53 g/L acid with traces of Cu, Ni and Co. An ambient extraction at 30 °C yielded acceptable kinetics and loading efficiency for 40% trialkylphosphine oxide with a saturated loading capacity of 51.85 g/L in four contacts at O/A ratio of 1/1 in a multiple contact mode. Iron from the loaded organic was stripped using various strippants such as distilled water, H(2)SO(4) and oxalic acid. Since only 32% of loaded Fe could be stripped with 2 M H(2)SO(4) in five contacts, further stripping was done with 5% oxalic acid which showed a very promising result. It was found that almost 100% of Fe(III) could be stripped out with 5% oxalic acid at O/A of 1/1 in five contacts.
authors.affiliation: Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur 831007, India. archana_nml03@yahoo.com
authors.forename: Archana
authors.initials: A
authors.lastname: Agrawal
authors.forename: S
authors.initials: S
authors.lastname: Kumari
authors.forename: K K
authors.initials: KK
authors.lastname: Sahu
mesh_terms: D007220:Industrial Waste; D007501:Iron / Q000032:analysis / Q000737:chemistry*; D007700:Kinetics; D012997:Solvents / Q000737:chemistry; D013232:Steel; D013431:Sulfates / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
chemical_list: D007220:Industrial Waste; D012997:Solvents; D013431:Sulfates; D013232:Steel; D007501:Iron