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8 mg/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。
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.
作者
洪茂鑫
王军
杨宝军
刘洋
廖甤
于世超
刘仕统
汤安妮
王炜
邱冠周
Mao-xin HONG;Jun WANG;Bao-jun YANG;Yang LIU;Rui LIAO;Shi-chao YU;Shi-tong LIU;An-ni TANG;Wei WANG;Guan-zhou QIU(School of Minerals Processing&Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Biohydrometallurgy,Ministry of Education,Central South University,Changsha 410083,China;South China Institute of Environmental Sciences,Ministry of Ecology and Environment,Guangzhou 510655,China)
基金
financially supported by the National Key Research and Development Program of China(Nos.2022YFC2105300,2022YFC2105304,2022YFC2105305)
the Innovation-Driven Project of Central South University,China(No.1053320220066)。
