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9.
Studies on the Adsorption and Desorption of Sodium-Palmitate and
Sodium-Laurate on the Surface of some Ores in Aqueous Media
Millicent U. Ibezim-Ezeani and Alphonso C. I. Anusiem
Department of Pure and Industrial Chemistry, University of Port
Harcourt, P.M.B. 5323, Choba, Port Harcourt, Nigeria, Tel:
07039450740, E-mail:
millibejmj@yahoo.com
Abstract:
Adsorption and desorption studies on sodium-palmitate and
sodium-laurate on the surface of galena, hematite and
cassiterite in aqueous media at various temperatures were
carried out to determine the optimal temperature condition for
the processes. The adsorption capacity of sodium-palmitate and
sodium-laurate showed gradual decrease with increase in
temperature from 29oC to 70oC. The results
show that the optimal temperature for adsorption process is 29oC.
Most of the adsorbed species were desorbed at about 70oC
suggesting a reversible – physical adsorption process. The
adsorption and desorption capacities for sodium-laurate were
higher than those of sodium-palmitate and on the adsorbent
surfaces were in the order: galena > hematite > cassiterite. The
adsorption at 29oC / desorption at 70oC
versus equilibrium concentration curve could be described based
on the V-shaped type adsorption / desorption hysteresis theory.
KEY WORDS: Adsorption, Desorption, Soap, Collector
reagent, Metal ore.
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