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Chemistry for Sustainable Development

2012 year, number 5

Studies on a Three-Phase Extraction Nickel in the Systems with Cyanex 301

Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, Ul. K. Marksa 42, Krasnoyarsk 660049 (Russia),
Keywords: Cyanex 301, nickel, three-phase extraction, binary extraction, concentrating the extraction agent
Pages: 515521


Phase formation was studied for the systems of Cyanex 301 (bis(2,4,4-trimethylpentyl)dithiophosphinic acid)organic solvent (toluene, heptane, octane)sodium hydroxidewatertrioctylamine. It is demonstrated that the Cyanex 301 transition into a salt form (three-phase extraction) results in achieving the separation of the organic extraction agent solution into the solvent phase and a cation-exchange extraction agent. The sodium salt of Cyanex 301 is almost completely transformed into a new aqueous micellar solution. Conditions have been determined for the efficient separation of the organic phase components and for the isolation concentrated Cyanex 301. An effect of trioctylamine additives exerted on nickel extraction in the systems with Cyanex 301 was studied. A scheme has been proposed for the extraction of nickel using a three-phase extraction, wherein nickel is extracted by means of the concentrated solution of Cyanex 301 from acidic solutions resulted from leaching the ore, the extract is mixed with an organic amine solution to be re-extracted with sulphuric acid, whereas the organic phase is separated into initial components via treatment by sodium hydroxide solutions.