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Removal of Phosphorous from Australian Iron Ores

机译：从澳大利亚铁矿石中去除磷

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摘要

Phosphorous is typically present in iron ore either in the mineral apatite, Ca_5(PO_4)_3OH, or associatedrnwith the goethitic fraction of the ore. In this paper, we present results that show that phosphorousrnassociated with the goethitic fraction can be removed with a heating pretreatment around 300℃rnfor 1 h, followed by a caustic leach with 1 - 5 M NaOH, or a leach with sulfuric acid at pH 0.5. Thernheating pretreatment is considered to dehydroxylate the goethite to form a haematite intermediaternphase, 'protohaematite', that reacts during the leach making the phosphorous accessible to thernleachant. In the acid leach, ten to 15 per cent of the sample was dissolved to obtain a leach productrnwith 0.08 per cent P. In the caustic leach, as no weight loss occurs, it is proposed that iron speciesrnassociated with the protohaematite have either not dissolved or have reprecipitated at the high pHrnvalues of the leach.rnFor an ore containing apatite as the source of phosphorous, a leach with sulfuric acid dissolvedrnthe apatite, lowering the phosphorous levels in the sample. The sample treated containedrncarbonate minerals (including siderite) that also reacted with the acid, and in practice a balancernbetween the dissolution of the apatite and the carbonate minerals may be needed to minimise acidrnconsumption.
机译：磷通常存在于铁磷灰石Ca_5（PO_4）_3OH中或与矿石的针铁矿级分相关的铁矿石中。在本文中，我们的结果表明，可以通过在300℃rn左右的加热预处理1 h除去与针铁矿级分相关的磷，然后用1-5 M NaOH进行苛性浸出，或用pH 0.5的硫酸进行浸出。 。认为加热预处理可使针铁矿脱羟基，形成赤铁矿中间相“原赤铁矿”，在浸出过程中发生反应，使磷易于浸出剂接触。在酸性浸出中，将10％到15％的样品溶解，得到P值为0.08％的浸出产物。在苛性浸出中，由于未发生重量损失，因此建议与原赤铁矿关联的铁物种既不溶解也不溶解。在浸出液的高pH值下会沉淀。对于含磷灰石作为磷源的矿石，将硫酸溶解在磷灰石中的浸出液会降低样品中的磷含量。处理过的样品含有碳酸盐矿物（包括菱铁矿），它们也与酸反应，实际上，可能需要在磷灰石和碳酸盐矿物的溶解之间取得平衡，以最大程度地减少酸的消耗。

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  • 来源
    《Iron ore 2011》|2011年|p.403-412|共10页
  • 会议地点 Perth(AU)
  • 作者

    C I Edwards; M J Fisher-White; R R Lovel; G J Sparrow;

  • 作者单位

    CSIRO Process Science and Engineering, Box 312, Clayton South Vic 3169. Email: Cathy.Edwards@csiro.au;

    CSIRO Process Science and Engineering, Box 312, Clayton South Vic 3169. Email: Michael.Fisher-White @csiro.au;

    CSIRO Process Science and Engineering, Box 312, Clayton South Vic 3169. Email: Roy.Lovel@csiro.au;

    CSIRO Process Science and Engineering, Box 312, Clayton South Vic 3169. Email: Graham.Sparrow@csiro.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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