Effects of Iron Ore Type and Gangue Mineral Components on Strength of Sintered Fine Powder Granule

Research output: Contribution to journalArticlepeer-review

Abstract

Depletion of high-grade iron ore resources leads to increasing use of ore concentrates as raw materials for sinter. One of the methods to effectively utilize such concentrates is Mosaic EmBedding Iron Ore Sintering (MEBIOS), which pre-granulated green pellets are charged into sintering bed with the mixture of other raw materials. In this study, effects of the ore type and gangue mineral components on the strength of sintered pellet prepared of fine concentrates were examined. Green pellets were prepared using hematite and magnetite ores, burnt lime and alumina and mullite reagents, and then sintered at 1300°C. The strength of sintered pellet increases with increasing basicity (CaO/SiO2, C/ S) at lower basicity region. The pellet using hematite ore with C/S above 1.5 showed higher strength than 980 N. It can be attributed to the melt formation during sintering. On the other hand, when using magnetite ore, higher strength than 980 N was obtained above C/S = 1.0. The reason is an acceleration of solid-state sintering by the volume expansion due to oxidation of magnetite to hematite. Increasing Al2O3 content leads to decreasing the strength of pellet because oxidation of magnetite is prevented by the increasing amount of formed melt.

Original languageEnglish
Pages (from-to)463-470
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume107
Issue number6
DOIs
Publication statusPublished - 2021 Jun 1

Keywords

  • Alumina
  • Basicity
  • Dense pellet
  • Fine ore
  • Iron ore sintering
  • Strength

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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