Effect of Temperature on Morphology of Metallic Iron and Formation of Clusters of Iron Ore Pellets

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• 作者：Jean Philippe Santos Gherardi de Alencar…
• 刊名：Metallurgical and Materials Transactions B
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：47
• 期：1
• 页码：85-88
• 全文大小：1,404 KB
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• 作者单位：Jean Philippe Santos Gherardi de Alencar (1)
  Valdirene Gonzaga de Resende (1)
  Luiz Fernando Andrade de Castro (2)
  
  1. Ferrous Technology Center, Vale S.A., Nova Lima, MG, 34000-000, Brazil
  2. Metallurgical Department, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Manufacturing, Machines and Tools
  Metallic Materials
  Operating Procedures and Materials Treatment
  Characterization and Evaluation Materials
  Numerical and Computational Methods in Engineering
  
• 出版者：Springer Boston
• ISSN：1543-1916

文摘

The increase of the reduction temperature in direct reduction furnaces has been a recurring tool due to the benefits that it provides to the process. However, its increase cannot be performed without taking into account some considerations, since the sticking phenomenon is directly correlated with it and could lead to permeability problems and reactor performance. An analysis of the formation of pellets clusters at different temperatures was carried out with focus on morphological characterization of reduced materials to better understand the causes and effects of these actions. The results showed a correlation between the morphology of the metallic iron present in the samples and the clustering index. At low reduction temperatures, 1123 K (850 °C), the iron formed is eroded and deformed and the cluster hardly remains after tumbling. When forming iron with fibrous structure, 1223 K (950 °C), the clustering index increases because of anchor points which make the material to stick together. Finally, under the effect of high temperature and long time, it generates fresh precipitated iron, enhancing the resistance of the clusters so that they cannot be separated. Manuscript submitted on July 15, 2015.