Studies on kinetics and thermodynamics of biomachining pure copper

The kinetics and thermodynamics of biomachining pure copper by Thiobacillus ferrooxidans were quantitatively analyzed. The kinetic effect of bacteria on the ion-cycle between Fe(2+) and Fe(3+) and the thermodynamic effect of hydrolysis on the changes of pH in biomachining processes were expounded through six series of experiment. Finally a model of ion-cycle in the biomachining processes was proposed, and the measures for maintaining the stable equilibrium of the ion-cycle were also discussed.