Title: Influence of Alumina on Iron Ore Sinter Quality and Productivity
Abstract: Iron ore sinter is the major source of iron in the burden to the modern blast furnace. Hence the appropriate chemical, physical and metallurgical properties of sinter in the blast furnace are essential to its efficient and stable operation. Iron ore fines are the main source for sinter and the chemical composition of the iron ore fines and thermal conditions within the sinter bed plays an important role in sintering. Sintering parameters as well as sinter chemistry govern the sinter structure and quality. Ore with higher alumina content are usually expected not to be good in forming sinter matrix, due to the low reactivity of alumina bearing minerals and the high viscosity of primary melts. Alumina in sinter mix requires higher heat for its assimilation and delays the sintering process. Alumina demands higher heat for blast furnace slag fluidity. The alumina has deleterious effect both on the performance of sinter plant as well as blast furnace. Indian iron ores, otherwise quite high in iron content and low on gangue in general, are characterized by high alumina content. Due to depletion of high grade iron ore fines it is necessary to utilize available material for sintering. It is therefore necessary to understand the role of alumina and its effects on sinter quality and sin1eiiii process. In the present work laboratory sintering experiments has been carried out with different alumina level of iron ore fines (2.00% to 5.46%) to know the influence of alumina on mineralogy, productivity, physical, and metallurgical properties of sinter. With increase of alumina content in sinter hematite, silico ferrites of calcium and alumina (SFCA) and pore phase increase I whereas magnetite and silicate phase decreased. With increase in alumina content sinter productivity & tumbler index (TI) decreased, and metallurgical properties like sinter RDI and reducibity increased.
Publication Year: 2010
Publication Date: 2010-01-30
Language: en
Type: article
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Cited By Count: 1
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