Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 17, No. 2 (July 2004) 191-200   

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  THERMODYNAMICS OF EXTRACTION OF ZN2+ FROM SULFURIC ACID MEDIA WITH A MIXTURE OF DEHPA AND MEHPA
 
S. K. Sadrnezhaad

Department of Materials Science and Engineering
Center of Excellence in Production and Forming Processes of Materials
Sharif University of Technology, P.O. Box 11365-9466, Tehran, Iran
sadrnezh@ sharif.edu


E. Keshavarz Alamdari

Department of Mining and Metallurgical Engineering
Amirkabir University of Technology, Hafez Avenue, Tehran, Iran
alamdari@aut.ac.ir
 
 
( Received: April 10, 2003 – Accepted in Revised Form: May 10, 2004 )
 
 

Abstract    Thermodynamics of extraction of Zn2+ from sulfuric acid media contacting to a mixture of DEHPA and MEHPA diluted with 80 wt% aromatic-aliphatic kerosene with a constant DEHPA to MEHPA ratio is investigated at different acidities, concentrations and temperatures. As a result, the extraction reaction is found to be endothermic with a zinc distribution factor that increases with increasing of the temperature, acidity of the solution and the concentration of the extractant. The mechanism of the extraction reaction is shown to be different for pH > 1 with that at pH <1. The pH of the aqueous media has also an important influence on progressing of the extraction reaction.

 

Keywords    Solvent Extraction, Zinc, DEHPA, MEHPA, Thermodynamics, Extraction Mechanism

 

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