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Understanding Reactions in Iron Ore Pellets

机译：了解铁矿石丸中的反应

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The induration furnace for iron ore pellets was originally designed to process concentrates withrnhigh contents of magnetite. To support the use of haematite concentrates, internal fuel was addedrnto the pellets in the form of ground coke breeze or anthracite. To ensure that the addition of cokernbreeze was not excessive, the 'heat of magnetite equivalent' or heat of magnetite equivalent (HME)rnrelationship was developed, guaranteeing that the fi ring temperature requirements remained thernsame. However, this oversimplifi es the different reaction paths of magnetite and carbon in ironrnore pellets. At fi ring temperatures, gas diffusion controlled reactions such as the combustion ofrncoke, the calcination of carbonates and the reduction and oxidation of iron oxides can all occur inrndifferent parts of the pellet simultaneously. The interaction of these reactions produces a range ofrnatmospheres across the diameter of the pellet that vary from oxidising at the pellet shell to reducingrnat the pellet core. Mathematical modelling and pellet fi ring experiments to preheat temperaturesrnbefore quenching have shown that a higher proportion of coke relative to magnetite slows downrnthe oxidation process, irrespective of temperature. A higher temperature, however, results in anrnincrease in the rate of haematite reduction in the pellet core and a more reducing atmosphere,rnwhich could lead to different sintering rates in different parts of the pellet and shrinkage cracksrnforming. To observe these gas-solid reaction rates at a larger scale, the COREM pot grate hasrnbeen updated with an additional oxygen analyser. This, along with other improvements, will allowrnbetter optimisation of straight-grate fi ring cycles for different pellet compositions.
机译：铁矿石球团矿的加热炉最初设计用于处理磁铁矿含量高的精矿。为了支持赤铁矿精矿的使用，将内部燃料以焦炭微风或无烟煤的形式添加到颗粒中。为了确保不过度添加角风，开发了“磁铁矿当量热”或磁铁矿当量热（HME）关系，以确保燃料温度要求保持相同。但是，这过度简化了铁矿球中磁铁矿和碳的不同反应路径。在烧结温度下，气体扩散控制的反应（如焦炭的燃烧，碳酸盐的煅烧以及铁氧化物的还原和氧化）都可以同时发生在小球的不同部位。这些反应的相互作用在整个颗粒的直径范围内产生了一系列的气氛，从在颗粒壳处的氧化到在颗粒芯处的还原而变化。在淬火之前进行预热温度的数学模型和颗粒烧结实验表明，相对于磁铁矿，较高的焦炭比例会降低氧化过程，而与温度无关。但是，较高的温度会导致丸芯中赤铁矿的还原率增加，气氛的还原性也会增加，这可能导致丸粒不同部位的烧结速率不同，并形成收缩裂纹。为了更大规模地观察这些气固反应速率，已使用额外的氧气分析仪更新了COREM罐式炉排。这与其他改进措施一起，将可以更好地优化不同颗粒组成的直炉排燃料循环。

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  • 来源
    《Iron ore 2011》|2011年|p.413-423|共11页
  • 会议地点 Perth(AU)
  • 作者

    A R Firth; J D Douglas; D Roy;

  • 作者单位

    COREM, 1180 rue de la Minéralogie, Québec QC G1N 1X7, Canada. Email: andrew.fi rth@corem.qc.ca;

    CSIRO Process Engineering, 1 Technology Court, Pullenvale Qld 4069. Email: Jeff .Douglas@csiro.au;

    COREM, 1180 rue de la Minéralogie, Québec QC G1N 1X7, Canada. Email: daniel.roy@corem.qc.ca;

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