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首页> 外文期刊>Journal of Environmental Management >Magnetite recovery from copper tailings increases arsenic distribution in solution phase and uptake in native grass
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Magnetite recovery from copper tailings increases arsenic distribution in solution phase and uptake in native grass

机译：从铜尾矿中回收磁铁矿会增加溶液相中的砷分布并增加原生草中的吸收

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Reprocessing magnetite-rich copper (Cu) tailings prompted a concern about arsenic (As) risks in seepage water and revegetated plants at Ernest Henry Cu Mine (EHM) in North Queensland, Australia, due to the closely coupled relationship between iron (Fe) minerals and As mobility. The magnetite removal alone significantly decreased the content of crystalline Fe minerals and the maximum arsenate (As(Ⅴ)) sorption capacity of the resultant tailings. A glasshouse experiment with native grass Red Flinders (Iseilema Vaginiflorum) was conducted with the reprocessed (low magnetite (LM)) and original (high magnetite (HM)) tailings, which were amended with 5% sugarcane residue (SR) as a basal treatment in combination with 0, 1 and 5% pine-biochar (BC). The organic matter treatments and plant growth stimulated the formation of secondary Fe minerals. The amount of extractable amorphous Fe in the amended and revegetated HM tailings was significantly higher than those in the LM. Arsenic forms in the specifically sorbed and the sorbed by amorphous Fe oxides were significantly increased by the SR amendment in the LM tailings, but which were decreased in the HM, compared to the unamended tailings. Soluble As levels in the porewater of the LM under revegetation were significantly higher (300-1150 μg As L~(-1)) than those (up to 45-90 μg As L~(-1)) in HM tailings in the same treatment, which led to the higher As concentrations in the plants grown in the LM tailings. In particular, root As concentration (62-146 mg kg~(-1)) in the LM tailings was almost a magnitude higher than those (8-17 mg kg~(-1)) in the HM. The present results confirmed the initial expectation that the recovery of magnetite from the Cu tailings significantly elevated the risk of As solubility in the tailings by decreasing As sorption capacity and increasing soluble As levels. Thus, it would be beneficial to retain high contents of magnetite in the top layer (e.g., root zone) of the Cu tailings for managing As risk and revegetation in the future.
机译：由于澳大利亚北部昆士兰州的欧内斯特·亨利·铜矿（EHM）对富磁铁矿的铜尾矿进行再处理，引发了人们对渗水和植被恢复植物中砷（As）风险的担忧，这是由于铁（Fe）矿物之间的紧密联系和作为流动性。单独除去磁铁矿可显着降低结晶铁矿物质的含量和所得尾矿的最大砷酸盐（As（Ⅴ））吸附能力。对经过处理的（低磁铁矿（LM））和原始（高磁铁矿（HM））尾矿进行了温室本地草红色碎片（Iseilema Vaginiflorum）的温室试验，并用5％的甘蔗渣（SR）进行了基础处理与0、1和5％的松木生物炭（BC）结合使用。有机物处理和植物生长刺激了次生铁矿物质的形成。经过修正和重新植被的HM尾矿中可提取的无定形Fe量显着高于LM。与未修正的尾矿相比，LM尾矿中的SR修正显着增加了专门吸附和被非晶态Fe氧化物吸附的砷形式，但在HM尾矿中的砷减少了。在相同的HM尾矿中，植被恢复后LM的孔隙水中的可溶性As水平（300-1150μgAs L〜（-1））显着高于（高达45-90μgAs L〜（-1））。处理，导致在LM尾矿中生长的植物中较高的As浓度。特别是，LM尾矿中的根砷浓度（62-146 mg kg〜（-1））几乎比HM中的根砷浓度（8-17 mg kg〜（-1））高。本结果证实了最初的期望，即通过降低砷的吸附能力和增加可溶性砷的含量，从铜尾矿中回收磁铁矿显着提高了砷在尾矿中溶解的风险。因此，有益的是在Cu尾矿的顶层（例如，根区）中保留高含量的磁铁矿，以用于将来管理As风险和植被恢复。

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