中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 34 No. 7 July 2024 |
（1. School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Biohydrometallurgy, Ministry of Education, Central South University, Changsha 410083, China;
3. South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, China）
Abstract:Bioleaching treatment was used to decontaminate pyrite-bearing waste rocks, mitigating the risk of acid mine drainage (AMD) generation at source. The bioleaching results showed that nearly 82% of Fe and S could be removed from pyrite-bearing waste within 40 d in the presence of Acidithiobacillus ferrooxidans (A. ferrooxidans). Kinetics study showed that the removal of pyrite from waste ore was mainly in the control of the chemical reaction and internal diffusion. The results of X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicated that the formed biogenic jarosite could passivate the residual pyrite under the mediation of A. ferrooxidans. Secondary bioleaching experiments on the residual samples revealed no noticeable decrease in solution pH and only 8 and 160 mg/L of iron dissolved from the two residual mine waste samples, respectively, indicating that the acid and iron release capacity of the mine waste samples was weakened.
Key words: acid mine drainage; pyrite; bioleaching; mine waste; jarosite; bio-passivation
