Effect of cooling methods on the strength of silico-ferrite of calcium and aluminum of iron ore sinter during the cooling process

Xu Zhang, Hao Bai, Xin Lu, Tian He, Jian Zhang, Huanmei Yuan, Zefei Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

In the iron making process, a high mechanical strength is favorable for iron ore sinters in the blast furnace, and the bonding phase is regarded as one of the key components that determines the quality of the iron ore sinter, in which the silico-ferrite of calcium and aluminum (SFCA) is one of the typical phases. In this study, synthesized samples with different SFCA mass fractions were prepared to study the effect of different cooling methods on the strengths of the SFCA samples. The results showed that the strength of a sample could be improved by increasing the SFCA content during a temperature change. Further, the test results for the compressive strength suggested that the SFCA had a positive effect on the strength of the iron ore sinter during cooling, with slow cooling being significantly effective at preventing the generation of thermal stress. Moreover, the Biot number was introduced to normalize all of the cooling methods. The results showed that higher mechanical strengths for iron ore sinters will be obtained with higher SFCA content and lower Biot numbers, which will guide the evaluation of mechanical strength of iron ore sinter after the cooling process in industry.

Original languageEnglish
Article number402
JournalMetals
Volume9
Issue number4
DOIs
Publication statusPublished - 2019 Apr

Keywords

  • Biot number
  • Bonding phase
  • Compressive strength
  • Cooling method
  • Iron ore sinter
  • Silico-ferrite of calcium and aluminium

ASJC Scopus subject areas

  • Materials Science(all)

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