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Kinetics and reaction mechanism of isothermal oxidation of Iranian ilmenite concentrate powder

Mozammel, M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s10973-012-2639-1
  3. Publisher: 2013
  4. Abstract:
  5. Thermal oxidation of commercial ilmenite concentrate from Kahnouj titanium mines, Iran, at 500-950 C was investigated for the first time. Fractional conversion was calculated from mass change of the samples during oxidation. Maximum FeO to Fe2O3 conversion of 98.63 % occurred at 900 C after 120 min. Curve fit trials together with SEM line scan results indicated constant-size shrinking core model as the closest kinetic mechanism of the oxidation process. Below 750 C, chemical reaction with activation energy of 80.65 kJ mol-1 and between 775 and 950 C, ash diffusion with activation energy of 53.50 kJ mol-1 were the prevailing mechanisms. X-ray diffraction patterns approved presence of pseudobrookite, rutile, hematite, and Fe2O3·2TiO2 phases after oxidation of ilmenite concentrate at 950 C
  6. Keywords:
  7. Isothermal oxidation ; Shrinking core model ; Kinetics ; Phase transformation ; Thermal mass change ; FeO ; Fractional conversion ; Ilmenite concentrate ; Isothermal oxidations ; Kinetic mechanism ; Reaction mechanism ; Ilmenite ; Thermal mass ; Activation energy ; Enzyme kinetics ; Iron oxides ; Isotherms ; Oxide minerals ; Phase transitions ; Reaction kinetics ; Titanium mines ; X ray diffraction ; Oxidation
  8. Source: Journal of Thermal Analysis and Calorimetry ; Volume 112, Issue 2 , 2013 , Pages 781-789 ; 13886150 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10973-012-2639-1