Extraction Rate of Nickel with 5-Dodecylsalicylaldoxime in a Vibro-Mixer
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In order to construct a recovery process of nickel from the wastewater of electroless nickel-plating, the extraction of nickel in aqueous ammonium sulfate solution with 5-dodecylsalicylaldoxime in kerosene was carried out using a vibro-mixer type continuous extractor, which has multiple vibration disks in a cylindrical tube. The effects of the initial concentrations of extractant, nickel, and proton, and the mean residence time of both solutions in the extractor on the extraction rate of nickel, were measured. The experimental results correlated to the complete mixing flow of both fluids in the extractor were analyzed based on the interfacial reaction rate. The calculated results for each frequency number of the vibration plates was well explained by the experimental results. The average extraction rate in the vibro-mixer type extractor was interpreted based on a similar interfacial reaction equation derived in a Lewis type transfer cell. The average extraction rate constants obtained in the vibro-mixer type extractor were 102- to 103-fold larger than that in the Lewis type transfer cell. The mixing using the vibro-mixer type extractor generates and regenerates small droplets at high speed, causing enhancement of the interfacial area and the surface renewal rate.
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