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首页> 外文期刊>Chemosphere >Towards 'Precision Mining' of wastewater: Selective recovery of Cu from acid mine drainage onto diatomite supported nanoscale zerovalent iron particles
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Towards 'Precision Mining' of wastewater: Selective recovery of Cu from acid mine drainage onto diatomite supported nanoscale zerovalent iron particles

机译：迈向废水的“精确开采”：从酸性矿山排水中有选择地回收铜到硅藻土负载的纳米零价铁颗粒上

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摘要

This paper introduces the concept of 'Precision Mining' of metals which can be defined as a process for the selective in situ uptake of a metal from a material or media, with subsequent retrieval and recovery of the target metal. In order to demonstrate this concept nanoscale zerovalent iron (nZVI) was loaded onto diatomaceous earth (DE) and tested for the selective uptake of Cu from acid mine drainage (AMD) and subsequent release. Batch experiments were conducted using the AMD and nZVI-DE at 4.0-16.0 g/L. Results demonstrate nZVI-DE as highly selective for Cu removal with 99% uptake recorded after 0.25 h when using nZVI-DE concentrations = 12.0 g/L, despite appreciable concentrations of numerous other metals in the AMD, namely: Co, Ni, Mn and Zn. Cu uptake was maintained in excess of 4 and 24 h when using nZVI-DE concentrations of 12.0 and 16.0 g/L respectively. Near-total Cu release from the nZVI-DE was then recorded and attributed to the depletion of the nZVI component and the subsequent Eh, DO and pH recovery. This novel Cu uptake and release mechanism, once appropriately engineered, holds great promise as a novel 'Precision Mining' process for the rapid and selective Cu recovery from acidic wastewater, process effluents and leach liquors. (C) 2018 The Authors. Published by Elsevier Ltd.
机译：本文介绍了“精确开采”金属的概念，可以将其定义为从材料或介质中选择性地原位吸收金属，随后回收和回收目标金属的过程。为了证明这一概念，将纳米级零价铁（nZVI）加载到硅藻土（DE）上，并测试了酸性矿山排水（AMD）对铜的选择性吸收和后续释放。使用AMD和nZVI-DE以4.0-16.0 g / L进行批量实验。结果表明，使用nZVI-DE浓度> = 12.0 g / L时，0.25 h后nZVI-DE对铜的去除具有很高的选择性，尽管AMD中许多其他金属（例如Co，Ni，锰和锌。当分别使用nZVI-DE浓度为12.0和16.0 g / L时，Cu吸收保持超过4小时和24小时。然后记录了从nZVI-DE释放出的近乎全部的Cu，这归因于nZVI组分的消耗以及随后的Eh，DO和pH的恢复。这种经过适当设计的新颖的铜吸收和释放机制，有望作为一种新颖的“精确采矿”工艺，用于从酸性废水，工艺废水和浸出液中快速，选择性地回收铜。 （C）2018作者。由Elsevier Ltd.发布

著录项

  • 来源
    《Chemosphere》 |2018年第7期|339-348|共10页
  • 作者

    Crane R. A.; Sapsford D. J.;

  • 作者单位

    Univ Exeter, Camborne Sch Mines, Penryn Campus, Penryn TR10 9FE, Cornwall, England;

    Cardiff Univ, Sch Engn, Queens Bldg, Cardiff CF24 3AA, S Glam, Wales;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Future mining; Diatoms; Nanoparticles; Nanocomposite; Cementation; Remediation;

    机译：未来采矿;硅藻;纳米颗粒;纳米复合材料;胶结;修复;

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