焼結鉱の鉱物組織形成に及ぼすマグネタイトおよび雰囲気の影響

Translated title of the contribution: Effect of Magnetite on Mineral Phase Formation in Sintering Process

Ziming Wang, Takayuki Maeda, Ko Ichiro Ohno, Kazuya Kunitomo

Research output: Contribution to journalArticlepeer-review

Abstract

Mineral phase formation behavior in the sintering process is one of the most important factors for quality and productivity of iron ore sinter. As resource of high-grade hematite ore is exhausting, it is expected that hematite ore can replaced by magnetite in ironmaking. So that, the purpose of this study is to investigate the effect of magnetite on mineral phase formation. To clarify the effects of magnetite on mineral phases formation, sintering experiments using hematite and magnetite reagent were carried out. To research the effects of atmosphere and temperature, samples were sintered under oxidizing (air) and reducing (CO-CO2) atmosphere at 1250ºC and 1350ºC respectively. The results were analyzed by microscopic observation and image processing. Under both oxidizing and reducing atmosphere, the shapes of each phase after sintering of magnetite samples are likely to hematite samples. From the image processing results, the ratio of each phases formed after sintering of samples were at the same level. So, it is expected that magnetite can be used as raw material instead of hematite in sintering process. Under Air atmosphere, both hematite and magnetite samples formed more calcium ferrite phase when the sintering temperature was higher. Moreover, under Air atmosphere, the calcium ferrite formation ratio of both hematite and magnetite samples was larger than that of under CO-CO2 atmosphere. Therefore, it is very important to keep oxidation state in sintering process.

Translated title of the contributionEffect of Magnetite on Mineral Phase Formation in Sintering Process
Original languageJapanese
Pages (from-to)456-462
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume107
Issue number6
DOIs
Publication statusPublished - Jun 1 2021

All Science Journal Classification (ASJC) codes

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

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