Coating of iron oxide pellets for direct reduction

Basdag A., Arol A.

SCANDINAVIAN JOURNAL OF METALLURGY, cilt.31, sa.3, ss.229-233, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 3
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1034/j.1600-0692.2002.310310.x
  • Dergi Adı: SCANDINAVIAN JOURNAL OF METALLURGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.229-233
  • Anahtar Kelimeler: direct reduction, iron ores, pellet coating, pelletizing, sticking, FLUIDIZED-BED REDUCTION, STICKING, ORES
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Depending upon their chemical composition and, to a lesser extent, on their physical properties, iron oxide pellets exhibit varying degrees of sticking tendency during direct reduction at elevated temperatures. For an efficient shaft furnace operation in direct reduction (DR), it is imperative to prevent pellets from sticking to each other and, hence, forming clusters. Coating of pellets with a suitable inorganic material has increasingly been gaining recognition amongst the pellet producers and DR plant operators as an effective method of preventing sticking. In this study, the effect of coating on the sticking of DR-grade pellets with low and high basicity (Midrex and HyL quality pellets, respectively) was investigated. The results show that bauxite and serpentine alone, and limestone and bentonite in combination are suitable materials for the prevention of sticking of both types of pellets.