Optimization of Bioleaching Conditions of Pyritum Using Acidithiobacillus ferrooxidans

Objective:To optimize bioleaching parameters of pyritum using Acidithiobacillus ferrooxidans(A.f).Method:With leaching rate of pyritum as index,three variables including concentration,pH and temperature of pulp were investigated by response surface methodology.Result:A quadratic polynomial regression model was developed and optimized bioleaching conditions were as follows:pulp concentration 0.97%,pH 1.82,temperature 34.75 ℃.Bioleaching rate of pyritum was up to 82.04%,it was close to the predicted value.Conclusion:This optimized technology was simple with high bioleaching ratio and good reproducibility.