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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   LEACHING OF CHALCOPYRITE CONCENTRATE WITH SULPHURIC ACID IN ABSENCE AND PRESENCE OF OXIDIZING AGENTS.

Authors:  CAMELIA LUMINITA VARGA, LIVIU ONICIU.
 
       
         
  Abstract:  The kinetic leaching characteristics of chalcopyrite concentrate were investigated in sulphate media. The experiments were carried out on chalcopyrite concentrate obtained by flotation of the ores from mines around Baia Mare. The concentrate has the following chemical composition: 30.38% Cu, 4.2% Zn, 1.93% Pb, 28.89% Fe and 34.49% S. Three stages of the leaching process were established. The apparent activation energy suggests a dependence on the period of leaching and on the presence of ferric ion and oxygen as oxidizing agents in the leaching solution. Also, an attempt was made to determine the rate controlling reaction step, according to both the activation energies, and the analytical expressions for each period. The parameters that were modified during experiments were: the leaching time, the leaching temperature and the quantity of ferric sulphate and of oxygen as oxidizing agents.  
         
     
         
         
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