REDUCTION BEHAVIOR OF IRON IN THE RED MUD

Eray S., Keskinkilic E., Topkaya Y. A., Geveci A.

JOURNAL OF MINING AND METALLURGY SECTION B-METALLURGY, cilt.57, sa.3, ss.431-437, 2021 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 57 Sayı: 3
  • Basım Tarihi: 2021
  • Doi Numarası: 10.2298/jmmb210227039e
  • Dergi Adı: JOURNAL OF MINING AND METALLURGY SECTION B-METALLURGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Directory of Open Access Journals
  • Sayfa Sayıları: ss.431-437
  • Anahtar Kelimeler: Red mud, Iron, Solid-state reduction, RECOVERY, MICROWAVE, RESIDUE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Red mud or bauxite residue contains significant quantities of industrial metals such as Fe, Al, and Ti, as well as rare earth elements such as Sc, Ce, and La. The authors performed a laboratory-scale project dealing with stepwise recovery of valuable elements from two bauxite residues, namely Iranian red mud (IRM) and Turkish red mud (TRM). The first stage involved the recovery of iron which was present in large quantities in red mud. Two different methods were investigated for this purpose: 1) solid state reduction followed by wet magnetic separation and 2) smelting. In the scope of this paper, some results of pyrometallurgical part of this project are presented. According to solid-state reduction experiments, it was found that more excess coal was needed for IRM (35%) than for TRM (15%) to maximize iron reduction. Temperature had significant effect on the reduction process and metallization increased from about 70% to about 95% when the temperature was raised from 1000 to 1200 degrees C. Metallization degree was reported to be slightly higher for IRM (96.2%) than for TRM (94.1%). The results demonstrated that a high degree of iron metallization can be achieved regardless of the chemical and mineralogical composition of the bauxite residue sample.