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The Occurrence of Phosphorus and Other Impurities in Australian Iron Ores

机译：澳大利亚铁矿石中磷和其他杂质的发生

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摘要

The characterisation of high-P iron ores by fi eld emission gun electron probe microanalyser (FEGEPMA)rnwas carried out to determine elemental associations in iron oxides sensus lato and, usingrnthis knowledge, to speculate on possible P incorporation mechanisms in goethite. Quantitative datarnwas collected from two goethite-rich bulk ores and results showed that in both samples goethiternwas the main repository for phosphorus. The P-rich goethite also contained elevated levels of bothrnaluminium and silicon.rnTo understand the mechanism of P incorporation in goethite, high-P grains were located byrncoarse mapping of polished blocks with the FEG-EPMA. Analysis of element distribution mapsrncollected on the P-rich grains showed that low-P regions within grains were typically associatedrnwith low-Al and high-Si, whereas high-P regions were associated with high-Al and low-Si. Based onrnfollow-up quantitative analyses, a coupled substitution mechanism for phosphorus incorporationrnwithin goethite was proposed: 2Si~(4+) = 1P~(5+) + 1Al~(3+). Additional quantitative analyses on furtherrnexamples indicated the mechanism was only valid for Si contents in goethite of <1 wt per cent.rnPreliminary transmission electron microscope (TEM) studies confi rmed the presence of P, Al andrnSi in goethite.
机译：通过场发射枪电子探针显微分析仪（FEGEPMA）对高磷铁矿石进行了表征，以确定铁氧化物氧化铅中的元素缔合，并利用该知识推测针铁矿中可能的磷掺入机理。从两个富含针铁矿的块状矿石中收集了定量数据，结果表明，在两个样品中，针铁矿都是磷的主要储存库。富含P的针铁矿还含有较高含量的铝和硅。为了了解P掺入针铁矿的机理，通过用FEG-EPMA对抛光块的粗测来确定高P晶粒。对富P晶粒上收集的元素分布图的分析表明，晶粒内的低P区通常与低Al和高Si相关，而高P区则与高Al和低Si相关。在后续的定量分析基础上，提出了针铁矿中磷结合的耦合取代机理：2Si〜（4+）= 1P〜（5+）+ 1Al〜（3+）。对其他实例的其他定量分析表明，该机理仅对小于1 wt％的针铁矿中的硅含量有效。初步透射电子显微镜（TEM）研究证实，针铁矿中存在P，Al和rnSi。

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  • 来源
    《Iron ore 2011》|2011年|p.281-289|共9页
  • 会议地点 Perth(AU)
  • 作者

    C M MacRae; N C Wilson; M I Pownceby; P R Miller;

  • 作者单位

    CSIRO Process Science and Engineering, Bayview Avenue, Clayton Vic 3168. Email: Colin.macrae@csiro.au;

    CSIRO Process Science and Engineering, Bayview Avenue, Clayton Vic 3168. Email: Nick.wilson@csiro.au;

    CSIRO Process Science and Engineering, Bayview Avenue, Clayton Vic 3168. Email: Mark.pownceby@csiro.au;

    Monash Centre for Electron Microscopy, Monash University, Clayton Campus, Vic 3800. Email:Peter.miller@mcem.monash.edu.au;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 铁矿石;
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