Abhilash, K.D.Mehta
Bio-leaching of copper (0.3%) from a low grade Indian chalcopyrite ore of Malanjkhand copper mines, using a native mesophilic isolates predominantly Acidithiobacillus ferrooxidans (A.ferrooxidans), is reported. A bio-recovery of 72% Cu was recorded in the presence of this culture (not adapted), which increased to 75% with an ore adapted culture after 35 days at 35°C and pH 2.0 with <50μm particles. The kinetic data showed best fit for the diffusion-controlled shrinking core model, exhibiting linear plots for [1 - 2/3- (1-X)²] vs time (X-fraction leached). Apparently, the role of the bacteria is to convert the ferrous into the ferric state, which oxidizes the chalcopyrite in order to dissolve copper, maintaining a high redox potential. The kinetic data for various particle sizes also fitted well to the diffusion control model. The plots of rate-constant values (k<sub>t</sub>) with the reciprocal of r<sup>2</sup> (r being the size of the particles used) at 35°C for un-adapted and the adapted bacteria, showed straight lines (not given here) which further confirmed that the copper bio-leaching followed the diffusion controlled model. The activation energy values (E<sub>a</sub>) were calculated from the Arrhenius plots and were found to be 96 and 108 kJ/mol respectively for the leaching with the un-adapted and adapted isolates under the temperature range 298-308K at 2.0pH.
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title={abhilash 13 pdf},
author={Abhilash and K.D.Mehta},
year={2026},
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