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In Situ Diff raction Studies of Phase Formation During Iron Ore Sintering

机译：铁矿石烧结过程中相形成的原位衍射研究

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摘要

The reaction sequences involved in the formation of iron ore sinter phases were determined usingrnin situ synchrotron-based X-ray diffraction. Experiments were carried out using a synthetic sinterrnmixture containing 77.36 per cent Fe_2O_3, 14.08 per cent CaO, 3.56 per cent SiO_2 and 5.00 perrncent Al_2O_3 corresponding to a basicity of ～4. The alumina content represents the upper level ofrnalumina concentrations measured in phases formed in industrially produced plant sinter. Datarnwere collected during heating of the sample to 1350℃ under an atmosphere of 0.5 per centrnO_2 in N_2, equivalent to an oxygen partial pressure of 5×10~(-3) atm. This temperature was suffi cientrnto ensure melting. Data were also collected on cooling of the sample back to room temperature tornexamine recrystallisation of phases from the melt.rnResults showed the sequence of reactions initially involved the formation of calcium ferriternphases C℃2F and CF. These subsequently reacted with the silica and haematite leading to the solidrnstate formation of SFCA and SFCA-1. SFCA and SFCA-1 were the last phases to form in the systemrnand were both stable up to ～1260℃. Above ～1260℃, melting of the SFCA phases and reduction ofrnthe remaining haematite occurred producing the assemblage magnetite + melt.rnDuring cooling, both SFCA phase types recrystallised from the melt initially coexisting withrnmagnetite until secondary haematite formed. This is the fi rst study to demonstrate that both SFCArnand SFCA-1 are precipitated from the melt during cooling of iron ore sinter. Future work will extendrnthe range of compositions studied to examine the effect of basicity and alumina concentration onrnthe phase assemblages as a function of temperature and oxygen partial pressure.
机译：使用基于原位同步加速器的X射线衍射确定了铁矿烧结相形成过程中涉及的反应顺序。实验是使用一种合成的烧结混合物进行的，该混合物中含有77.36％的Fe_2O_3、14.08％的CaO，3.56％的SiO_2和5.00％的Al_2O_3，对应的碱度约为4。氧化铝含量代表在工业生产的工厂烧结矿中形成的各相中测得的最高氧化铝浓度。在N_2中的氧气浓度为0.5％rnO_2的条件下，将样品加热至1350℃时收集的数据相当于5×10〜（-3）atm的氧分压。该温度足以确保熔化。还收集了关于将样品冷却至室温的托勒密胺从熔体中重结晶的数据。结果表明，反应的顺序最初涉及钙铁离子相C℃2F和CF的形成。这些随后与二氧化硅和赤铁矿反应，导致SFCA和SFCA-1的固态形成。 SFCA和SFCA-1是体系中最后形成的相，在〜1260℃都稳定。在〜1260℃以上，SFCA相发生熔融，残留的赤铁矿发生还原，形成聚集磁铁矿+熔体。在冷却过程中，两种SFCA相类型均从熔体中重结晶，最初与磁铁矿共存，直至形成第二赤铁矿。这是首次研究，表明在铁矿石烧结矿冷却期间，SFCArn和SFCA-1均从熔体中沉淀出来。未来的工作将扩展所研究的组成范围，以检查碱度和氧化铝浓度对相组合随温度和氧分压的影响。

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  • 来源
    《Iron ore 2011》|2011年|p.537-543|共7页
  • 会议地点 Perth(AU)
  • 作者

    N A S Webster; M I Pownceby; I C Madsen; N V Y Scarlett; L Lu; J R Manuel;

  • 作者单位

    CSIRO Process Science and Engineering, Box 312, Clayton South Vic 3169. Bragg Institute, ANSTO, Locked Bag 2001, Kirrawee DC NSW 2234.Email: nathan.webster@csiro.au;

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

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

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

    CSIRO Process Science and Engineering, PO Box 883, Kenmore Qld 4069. Email: liming.lu@csiro.au;

    CSIRO Process Science and Engineering, PO Box 883, Kenmore Qld 4069. Email: james.manuel@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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