Bio-dissolution and kinetics of pyrite-bearing waste ores in presence of Acidithiobacillus ferrooxidans

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI:10.1016/S1003-6326(24)66545-3

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

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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.

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含黄铁矿废矿在酸性硫杆菌铁氧体存在下的生物溶解和动力学研究

生物浸出处理用于净化含黄铁矿的废石，从源头上降低酸性矿井排水（AMD）产生的风险。生物浸出结果表明，在酸性铁氧体杆菌（A. ferrooxidans）的作用下，含黄铁矿废石中近 82% 的铁和 S 可在 40 d 内被去除。动力学研究表明，废矿中黄铁矿的去除主要受化学反应和内部扩散的控制。X 射线衍射（XRD）和 X 射线光电子能谱（XPS）的结果表明，在铁氧体杆菌的介导下，形成的生物黄铁矿可以钝化残留的黄铁矿。对残留样品进行二次生物浸出实验后发现，溶液 pH 值没有明显下降，两个残留矿渣样品的铁溶解度分别只有 8 毫克/升和 160 毫克/升，表明矿渣样品的酸和铁释放能力减弱。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.