Influence of Alumina on Iron Ore Sinter Properties and Productivity in the Conventional and Selective Granulation Sintering Process
Influence of Alumina on Iron Ore Sinter Properties and Productivity in the Conventional and Selective Granulation Sintering Process
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DOI：
10.2374/sri08sp009
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发表时间：
2009-09
影响因子：
2.2
通讯作者：
T. Umadevi;A.V. Deodar;P. Mahapatra;M. Prabhu;M. Ranjan
中科院分区：
文献类型：
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作者：
T. Umadevi;A.V. Deodar;P. Mahapatra;M. Prabhu;M. Ranjan
铁矿石烧结矿是高炉炉料的主要组成部分。因此，其质量和一致性对高炉性能有重大影响。铁矿粉是烧结矿的主要来源，铁矿粉的化学组成以及混合料所经受的热条件在烧结过程中形成初级熔体方面起着重要作用，并因此决定了烧结矿的结构和质量。因此，铁矿粉的化学组成和稠度，特别是氧化铝含量，受到了相当大的重视。由于高品位铁矿石资源枯竭，预期铁矿粉中的氧化铝含量将逐步增加。由于含氧化铝矿物的低反应性和初级熔体的高粘度，如果单独烧结，通常预期具有较高氧化铝含量的矿石在形成烧结体基质时是有害的。选择性制粒工艺是一种新型的高铝铁矿粉烧结工艺，可以消除“难烧结”或“不适合炼铁”矿石的不利影响。在本工作中，采用不同氧化铝含量（2.00 ~ 5.46质量%）的铁矿粉进行了实验室烧结试验，以了解氧化铝对传统和选择性制粒工艺制备的烧结矿的矿物学、生产率、物理和冶金性能的影响。随着传统和选择性造粒工艺的烧结矿中氧化铝含量的增加，赤铁矿和钙铝硅铁氧体（SFCA）以及孔相的分数增加，而磁铁矿和硅酸盐相减少。随着氧化铝含量的增加，烧结矿生产率和转鼓指数（TI）烧结矿RDI、还原性等冶金性能得到改善。然而，与常规工艺相比，选择性造粒工艺的烧结显示出更好的结果。
Iron ore sinter constitutes a major proportion of blast furnace burden. Hence, its quality and consistency have a significant impact on blast furnace performance. Iron ore fines are the main source for sinter, and the chemical composition of the iron ore fines, together with the thermal conditions that blends are subjected to, plays an important role in forming the primary melt during the sintering process and accordingly determines the sinter structure and quality. Therefore, considerable importance has been placed on the chemical composition and consistency of iron ore fines, particularly in terms of alumina content. Due to depletion of high grade iron ore resources, alumina content in the iron ore fines is expected to increase gradually. Ore with higher alumina content is usually expected to be detrimental in forming the sinter matrix, if sintered alone, due to the low reactivity of alumina bearing minerals and the high viscosity of primary melts. The selective granulation process is a new sintering process for high alumina iron ore fines, and can eliminate the adverse effects of ‘hard to sinter’ or ‘unsuitable – for ironmaking’ ores. In the present work laboratory sintering experiments have been carried out with iron ore fines of different alumina level (2.00 to 5.46 mass‐%) to know the influence of alumina on mineralogy, productivity, physical and metallurgical properties of sinter prepared by the conventional and the selective granulation process. With increasing alumina content in sinter of both the conventional and selective granulation process, the fractions of hematite and of silico‐ferrites of calcium and alumina (SFCA) as well as the pore phase increased whereas the magnetite and silicate phases decreased. With increase in alumina content sinter productivity and tumbler index (T.I.) decreased, and metallurgical properties like sinter RDI and reducibility improved. However, sinter of the selective granulation process showed better results compared to the conventional process.