嗜酸氧化亚铁硫杆菌作用下含黄铁矿废石的生物溶解和动力学
Bio-dissolution and kinetics of pyrite-bearing waste ores in presence of Acidithiobacillus ferrooxidans
洪茂鑫 1王军 1杨宝军 1刘洋 1廖甤 1于世超 1刘仕统 1汤安妮 1王炜 2邱冠周1
作者信息
- 1. 中南大学资源加工与生物工程学院,长沙 410083;中南大学生物冶金教育部重点实验室,长沙 410083
- 2. 中南大学资源加工与生物工程学院,长沙 410083;生态环境部华南环境科学研究所,广州 510655
- 折叠
摘要
使用生物淋洗处理黄铁矿废石,从源头上缓解其产生酸性矿山废水(AMD)的风险.生物淋洗结果显示,在嗜酸氧化亚铁硫杆菌(A.ferrooxidans)的作用下,40天内可以从黄铁矿废石中去除近82％的铁和硫.动力学研究结果表明,废石中黄铁矿的去除主要受化学反应和内扩散控制.X射线衍射(XRD)和X射线光电子能谱(XPS)的结果表明,在A.ferrooxidans细菌介导下,生物源黄钾铁矾能够钝化废石中残余的黄铁矿.对渣样进行二次生物浸出,试验发现溶液pH没有明显下降,且仅有8mg/L和160mg/L的铁从两个黄铁矿废石渣样中溶出,表明渣样的酸和铁释放能力得到削弱.
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.
关键词
酸性矿山废水/黄铁矿/生物浸出/矿山废弃物/黄钾铁矾/生物钝化Key words
acid mine drainage/pyrite/bioleaching/mine waste/jarosite/bio-passivation引用本文复制引用
基金项目
National Key Research and Development Program of China(2022YFC2105300)
National Key Research and Development Program of China(2022YFC2105304)
National Key Research and Development Program of China(2022YFC2105305)
Innovation-Driven Project of Central South University,China(1053320220066)
出版年
2024
NETL
NSTL
万方数据