生物浸出
黄铜矿
酸性硫杆菌
铜提取技术
中层
氧化硫硫杆菌
铁质
冶金
化学
生物反应器
斑铜矿
柯石英
铜
微生物联合体
溶解
制浆造纸工业
微生物
材料科学
地质学
细菌
氧化亚铁硫杆菌
古生物学
有机化学
工程类
物理化学
作者
Abdellah Bakhti,Hamid Moghimi,Ali Bozorg,Srdjan Stankovic,Zahra Manafi,Axel Schippers
出处
期刊:Chemosphere
[Elsevier]
日期:2024-02-01
卷期号:349: 140945-140945
被引量:2
标识
DOI:10.1016/j.chemosphere.2023.140945
摘要
Chalcopyrite is the most abundant Cu-sulfide and economically the most important copper mineral in the world. It is known to be recalcitrant in hydrometallurgical processing and therefore chalcopyrite bioleaching has been thoroughly studied for improvement of processing. In this study, the microbial diversity in 22 samples from the Sarcheshmeh copper mine in Iran was investigated via 16S rRNA gene sequencing. In total, 1063 species were recognized after metagenomic analysis including the ferrous iron- and sulfur-oxidizing acidophilic genera Acidithiobacillus, Leptospirillum, Sulfobacillus and Ferroplasma. Mesophilic as well as moderately thermophilic acidophilic ferrous iron- and sulfur-oxidizing microorganisms were enriched from these samples and bioleaching was studied in shake flask experiments using a chalcopyrite-containing ore sample from the same mine. These enrichment cultures were further used as inoculum for bioleaching experiments in percolation columns for simulating heap bioleaching. Addition of 100 mM NaCl to the bioleaching medium was assessed to improve the dissolution rate of chalcopyrite. For comparison, bioleaching in stirred tank reactors with a defined microbial consortium was carried out as well. While just maximal 32% copper could be extracted in the flask bioleaching experiments, 73% and 76% of copper recovery was recorded after 30 and 10 days bioleaching in columns and bioreactors, respectively. Based on the results, both, the application of moderately thermophilic acidophilic bacteria in stirred tank bioreactors, and natural enrichment cultures of mesoacidophiles, with addition of 100 mM NaCl in column percolators with agglomerated ore allowed for a robust chalcopyrite dissolution and copper recovery from Sarcheshmeh copper ore via bioleaching.
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