Fluorine-containing mineral phases in ironmaking and steelmaking slags and their solubilities in aqueous solution

Ryo Inoue, Hideaki Suito

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The minerals containing fluorine in hot metal pretreatment, BOF and secondary refining slags are identified by using X-ray diffraction method and electron microprobe analysis. From the area fractions of these minerals on a polished cross-section estimated by using an image processor, it was found that a main mineral in hot metal pretreatment and BOF slags is 2CaO·SiO2 containing fluorine and that in secondary refining slag is 11CaO·7Al2O3·CaF2 or 12CaO · 7Al2O3 containing fluorine. The CaF2 phase is observed in hot metal pretreatment and BOF slags with the fluorine content above 2.3 mass%. The dissolution behavior of synthetic F-containing minerals such as CaF2, Ca5F(PO4)3, 3CaO·2SiO2·CaF2, 11CaO · 7Al2O3·CaF2 and 2CaO·SiO2 - 1 (or 2) mass%CaF2 solid solution, has been investigated in shaking test and the solubilities of these minerals are studied as a function of pH value of aqueous solution.

Original languageEnglish
Pages (from-to)785-793
Number of pages9
JournalIsij International
Volume42
Issue number7
DOIs
Publication statusPublished - 2002

Keywords

  • Fluorine
  • Fluorine dissolution
  • Hot metal pretreatment slag
  • Mineral
  • Secondary refining slag

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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