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Separation of arsenopyrite/loellingite and pyrite through bio-flotation by selective attachment of Leptospirillum ferrooxidans
Minerals Engineering ( IF 4.9 ) Pub Date : 2025-05-20 , DOI: 10.1016/j.mineng.2025.109440
Samar S. Almojadah, Sarah L. Harmer

The use of bacteria and their metabolites in lieu of chemicals in sulfide ore beneficiation holds promise for lessening the environmental damage caused by the minerals processing. In this study, the attachment of Leptospirillum ferrooxidans (L. ferrooxidans) to arsenopyrite/loellingite and pyrite was investigated through scanning electron microscopy (SEM). The effects of selective attachment, bacterial growth conditions, and extracellular polymeric substances (EPS) were investigated through bio-flotation. X-ray photoelectron spectroscopy (XPS) was utilised to determine the existence of surface species aiding in the separation. The results show L. ferrooxidans exhibits selective attachment to pyrite between 2 h and 72 h exposure via an indirect contact mechanism. Separation of pyrite from arsenopyrite/loellingite was achieved by exposing the minerals for 8 h with an L. ferrooxidans culture grown on HH media in the absence of a PIPX collector, for 10 h with an L. ferrooxidans culture grown on arsenopyrite in the absence of a PIPX collector, and for 10 h with an L. ferrooxidans culture grown on HH media in the presence of a PIPX collector. The results produced 52.2, 74.1, and 66.4 % recovery of pyrite, respectively. However, EPS supernatant extracted from L. ferrooxidans grown on pyrite, conditioned for 10 h in the presence of a PIPX collector, provided the best separation efficiency through the selective depression of arsenopyrite, resulting in 92.9 % pyrite recovery. Hydrophilic complex carbon structures, along with more arsenic oxides and a large amount of attached water, selectively attach to arsenopyrite exposed to EPS within 10 h, thereby depressing its floatability and ensuring a successful separation with a PIPX collector.

中文翻译:

通过选择性附着 Leptospirillum ferrooxidans 通过生物浮选分离砷黄铁矿/Loellingite 和黄铁矿

在硫化物矿石选矿中使用细菌及其代谢物代替化学品有望减轻矿物加工对环境造成的破坏。在这项研究中,通过扫描电子显微镜 (SEM) 研究了 Leptospirillum ferrooxidans (L. ferrooxidans) 与砷黄铁矿/loellingite 和黄铁矿的附着。通过生物浮选研究选择性附着、细菌生长条件和细胞外聚合物物质 (EPS) 的影响。使用 X 射线光电子能谱 (XPS) 来确定是否存在有助于分离的表面物质。结果表明,L. ferrooxidans 在暴露 2 h 至 72 h 之间通过间接接触机制表现出对黄铁矿的选择性附着。通过将矿物暴露 8 小时,在没有 PIPX 收集器的情况下,用在 HH 培养基上生长的 L. ferrooxidans 培养物暴露 10 小时,在没有 PIPX 收集器的情况下,用在砷黄铁矿上生长的 L. ferrooxidans 培养物暴露 10 小时,以及在 PIPX 收集器存在下用在 HH 培养基上生长的 L. ferrooxidans 培养物暴露 10 小时。结果分别产生了 52.2% 、 74.1 % 和 66.4% 的黄铁矿回收率。然而,从黄铁矿上生长的 L. ferrooxidans 中提取的 EPS 上清液,在 PIPX 收集器存在下活化 10 小时,通过选择性抑制砷黄铁矿提供了最佳分离效率,导致 92.9% 的黄铁矿回收率。亲水性复杂碳结构,以及更多的砷氧化物和大量附着的水,在 10 小时内选择性地附着在暴露于 EPS 中的砷黄铁矿上,从而降低其可浮性并确保与 PIPX 捕收剂成功分离。
更新日期:2025-05-20
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