Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 92, Issue 12, Pages 3105-3111Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2011.07.026
Keywords
Waste pickle liquor; Trialkylphosphine oxide; Solvent extraction; Iron extraction
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Funding
- Department of Science and Technology (DST), New Delhi, India
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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 degrees 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, H2SO4 and oxalic acid. Since only 32% of loaded Fe could be stripped with 2 M H2SO4 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. (C) 2011 Elsevier Ltd. All rights reserved.
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