Active Facilitated Transport and Separation of Co in Co–Ni Sulfate Solution by Hollow Fiber Supported Liquid Membrane Containing HEH(EHP)

Abstract

The active facilitated transport and separation of cobalt in mixed solution of cobalt and nickel sulfate were studied using hollow-fiber supported liquid membrane (HF-SLM). The HF-SLM contained 2-ethylhexylphosphonic acid mono-2 ethylhexyl ester [HEH(EHP)], which was diluted in kerosene as a carrier. The permeation rates and separation factors were found to be dependent on the operational variables such as the 1519 ORDER REPRINTS concentrations of metal and hydrogen ions in the feed solution, the carrier concentration in the liquid membrane, and the flow rate of feed solution. The permeation rate of cobalt was 10 26 -10 27 mol/m 2 s and the separation factor of Co/Ni was 10 -220 under the experimental conditions. By recirculating the strip solution, a tenfold enrichment of cobalt was possible and cobalt with 95% purity was recovered from the low concentration solution in which the concentrations of both cobalt and nickel were 17 mol/m 3 .

Inorganic Membranes: Preparation and Application for Water Treatment and Desalination

“…The applications of these liquid membranes and their family in the literature are limited to the extraction of some heavy and precious metals from water. Extraction of copper [ 382 ], zinc [ 383 ], nickel [ 384 ], alkali metals [ 385 ], precious metals [ 386 ], and rare earth metals [ 387 ] are a few examples of the usage of liquid membranes in water treatment.…”

Recent advances in supported liquid membrane technology

“…Separation and recovery of copper [14][15][16][17][18], zinc [19][20][21], nickel [22][23][24], alkali metals [25], precious metals [26][27][28][29], rare earth metals [30][31][32][33][34], etc., from aqueous technological solutions and wastewater purification based on supported liquid membranes has intensively been studied. One of the problems is that when H + concentration difference is used as a driving factor to transfer metal ions, with time this difference decreases and the process stops.…”

Archives of Metallurgy and Materials

“…The metal extraction chemistry is identical to that found in SX but the overall process is governed by kinetic rather than equilibrium. The HFSLM technique has been used for extraction/separation of cobalt using different extractant such as HEP(EHP) [22], D2EPHA [23], Cyanex 272 with Ionquest ® [24], dialkyl phosphinic acid [25]. A systematic study for extraction of cobalt using Cyanex 272 has never been reported yet.…”