期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 31, 期 6, 页码 1796-1805出版社
ELSEVIER
DOI: 10.1016/S1003-6326(21)65617-0
关键词
larger copper tailings; fine-grained tailings; column bioleaching; heap construction method; free and attached bacteria; microbial diversity
资金
- National Key R&D Program of China [2018YFC1801804]
- Shandong Provincial Natural Science Foundation, China [ZR2020QD120, ZR2018LD001]
- Project of Introducing and Cultivating Young Talent in the Universities of Shandong Province, China [QC2019YY144]
The study compared the bioleaching of copper flotation tailings using different heap construction methods, finding that the addition of lump sulphide ore in the agglomerate heap construction method group resulted in the highest copper extraction rate. The relative abundance of different microbial communities underwent changes in different heap construction methods.
The column bioleaching of copper flotation tailings was comparatively investigated using layered heap construction method (LM), agglomerate heap construction method (AM), and pellets-sintering heap construction method (PM). The bacterial communities of free, attached, weakly-attached, and strongly-attached microbes in the later bioleaching stage were investigated. In AM group, the addition of lump sulphide ore resulted in the low leachate pH, high ferric iron concentration, and rapid microbial adsorption, which obtained the maximum copper extraction (60.1%) compared with LM (54.6%) and PM (43.9%) groups. The relative abundance of dominant genera and microbial communities of different microbiota underwent changes in three heap construction methods. The alpha-diversity indexes of attached, weakly-attached, and strongly-attached microbes were different, while no significant change was observed in free bacteria. The variation of whole bacterial community was significantly associated with solution pH, total iron, and ferric iron concentrations. Pearson correlation analysis and partial least square path model both indicated that attached bacteria made larger contribution to the extraction of tailings.
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