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    STUDIA CHEMIA - Issue no. 1 / 2004  
         
  Article:   THE INFLUENCE OF THE OXIDIZING AGENTS ON THE KINETICS OF COPPER LEACHING FROM CHALCOPYRITE CONCENTRATE WITH SULPHURIC ACID.

Authors:  CAMELIA LUMINITA VARGA, IOAN BÂLDEA, ANCA MIHALY COZMUŢĂ. 		 
       
         
  Abstract:  The leaching rate constant and the apparent activation energy of chalcopyrite concentrate were investigated in sulphate media. The chemical composition (weight percent) of concentrate was: 30.38% Cu, 4.20% Zn, 1.92% Pb, 28.89% Fe and 34.49% S, respectively. The leaching time, the leaching temperature and the quantity of ferric sulphate and of oxygen as oxidizing agents were modified during the experiments. From the shape of the leaching curves, three stages of the process were observed. The apparent activation energy depends on the period of leaching as well as on the presence of ferric ion and oxygen as oxidizing agents in the leaching medium. The study intends to establish the rate controlling reaction step, according to both the activation energies, and the analytical expressions for each period.  
         
     
         
         
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