Characterisation and treatment of spent deposited sludge of transformer oil (DSTO) by acid leaching and solvent extraction

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dc.contributor.authorBaba, Alafara A.
dc.contributor.authorAyodele, Joshua S.
dc.contributor.authorAmeen, Oloduowo M.
dc.contributor.authorJimoh, Abdulrasaq
dc.contributor.authorJohnson, Uduakobong
dc.contributor.authorJimoh, Bilikisu A.
dc.contributor.authorLawal, Amudat
dc.date.accessioned2021-05-27T12:35:06Z
dc.date.available2021-05-27T12:35:06Z
dc.date.issued2017-08-31
dc.description.abstractThe characterisation of spent transformer oil to determine its fitness for re-refining as well as the recovery of metals by hydrometallurgical treatment in chloride medium has been investigated. The leaching experiments on the spent material showed that its dissolution increases with leachant concentration performed at 75°C. Leaching studies showed that at optimal conditions, the dissolution reached 93% by 1.0 mol L−1 HCl solution within 120 min at 75°C. The solvent extraction of copper by bis(2,2,4-trimethylpentyl) phosphinic acid (CYANEX®272) in kerosene from a pregnant solution of aqueous spent deposited sludge of transformer oil containing 1243.4 mg L−1 Cu++, 389.2 mg L−1 Fe++/+++, 110.7 mg L−1 Ca++ and 235 mg L−1 Al+++ was studied. The results for the solvent extraction give an extraction efficiency of 91.77% total copper acquired via 0.2 mol L−1 CYANEX®272 in kerosene at 27 ± 2°C within 25 min at pH 4.0. A 0.1 mol L−1 HCl solution was found to be sufficient for the stripping of about 94.77% copper from the loaded organic phase. The Fourier transform–infrared spectroscopic analysis of the loaded organic phase supports the stripping experiment as there was no Cu metal ion present in the separated organic phase.en_US
dc.identifier.urihttps://uilspace.unilorin.edu.ng/handle/20.500.12484/5495
dc.language.isoenen_US
dc.publisherPublished by Taylor & Francis on behalf of the Institute and The AusIMMen_US
dc.subjectTransformer oilen_US
dc.subjectdeposited sludgeen_US
dc.subjectleachingen_US
dc.subjectsolvent extractionen_US
dc.subjectcopperen_US
dc.subjectCyanex®272en_US
dc.titleCharacterisation and treatment of spent deposited sludge of transformer oil (DSTO) by acid leaching and solvent extractionen_US
dc.title.alternativeMineral Processing and Extractive Metallurgy: Transactions of the Institutions of Mining and Metallurgy: Section Cen_US
dc.typeArticleen_US

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