Purification of Roasted Iron Oxide Product from Waste Pickling Liquor by Glass-ceramic Method

Ryo Inoue, Hideaki Suito

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The experiment has been carried out for the purification of α-Fe2O3by the glass-ceramic method. After melting the roasted product of the waste pickling liquor with Na2O-B2O3fluxes having the Na2O/B2O3(mole ratio) = 1/2-1/5, the glass samples obtained by rapid quenching crystallized at temperatures ranging from 550 to 1 000°C for 55 s to 24 h. The separation of the precipitated α-Fe2O3from the flux was made by wet chemical treatment with water and dilute HCI solution, after which high purity and fine α-Fe2O3crystals were obtained. The impurity contents, Fe yield, and crystal shape and size have been investigated as functions of crystallization time, temperature and flux compositions. In the experiment that the crystallized fine α-Fe2O3particles were dissolved by dilute HCI solution in stepwise manner, the analysis of impurities in each stage shows that the contents of Si, Na, B, Ca and Al were enriched on the crystal surface.

Original languageEnglish
Pages (from-to)704-713
Number of pages10
JournalIsij International
Issue number9
Publication statusPublished - 1990 Feb 1
Externally publishedYes


  • glass-ceramic method
  • iron oxide
  • purification
  • roasted product of waste pickling liquor
  • sodium borate

ASJC Scopus subject areas

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


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