Hematite to magnetite reduction monitored by Mössbauer spectroscopy and X-ray diffraction

Gaviría, Juan P.; Bohé, Ana E.; Pasquevich, A. F.; Pasquevich, D. M.

doi:10.1016/j.physb.2006.07.056

Cited by 61 publications

(31 citation statements)

References 8 publications

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“…The isomer shift of Fe 3+ extracted from the doublet is a bit high compared to the value of Fe 3+ extracted from the sextet pattern of a-Fe 2 O 3 and this may be attributed to the change of neighbours in these two cases. The isomer shift value of Fe 3+ in a-Fe 2 O 3 obtained from the fitting of the sextet pattern is in good agreement with that reported in Gaviria et al [26]. The absolute values of the quadrupole shift, |2e|, and quadrupole splitting, Q.S., extracted from the sextet and doublet patterns, respectively, are 0.48 and 0.81 mm/s (shown in the inset of Fig.…”

Section: Article In Presssupporting

confidence: 90%

“…The sextet patterns are observed in the Mö ssbauer spectra recorded at room temperature of the samples annealed at and above 740 1C and these sextet spectra clearly indicate the onset of ordering caused by exchange interaction of Fe 3+ ions in these samples. The exchange interaction may favour the ferro-or antiferromagnetism but the extracted parameters from the sextet patterns particularly the hyperfine magnetic field and isomer shift values are in agreement with the respective reported values of a-Fe 2 O 3 [25,26]. Thus, the Mö ssbauer sextet pattern may be attributed to the presence of a small fraction of the a-Fe 2 O 3 in these samples.…”

Section: Article In Presssupporting

confidence: 86%

See 1 more Smart Citation

XRD, HRTEM, magnetic and Mössbauer studies on chemically prepared Fe3+-doped nanoparticles of cerium oxide

Acharya

Bandyopadhyay

Modak

et al. 2009

Journal of Magnetism and Magnetic Materials

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Section: Article In Presssupporting

confidence: 90%

Section: Article In Presssupporting

confidence: 86%

XRD, HRTEM, magnetic and Mössbauer studies on chemically prepared Fe3+-doped nanoparticles of cerium oxide

Acharya

Bandyopadhyay

Modak

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The tin removed can be recycled through smoke dust collection. Different with the earlier research, a special reductant, such as C, CO or H 2 , [5][6][7][8][9][10][11][14][15][16][17] was not added to the reaction system. The treatment conditions, such as roasting temperature and time, pyrite addition amounts and particle size of the tin-bearing iron concentrates have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Reduction Roasting of Tin-Bearing Iron Concentrates Using Pyrite

Zhang

2016

ISIJ Int.

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A novel method of reduction roasting of tin-bearing iron concentrates using pyrite (FeS 2 ) is proposed, in which hematite in tin-bearing iron concentrates is reduced to magnetite (Fe 3 O 4 ) and cassiterite (SnO 2 ) is transformed to volatile tin sulphide (SnS). In a certain range, tin removal and iron reduction rates both increase with roasting temperature, pyrite amounts and residence time. When pyrite amounts exceed 5.00 mass%, some of the produced magnetite will be sulfurated to FeS and the evaporation of SnS (g) will also be obstructed. Tin content of the concentrate is decreased to 0.07 mass% and hematite is reduced to magnetite completely under the conditions of N 2 flow rate of 5.00 × 10 − 6 m 3 /s, roasting temperature of 1 473.0 K, residence time of 60 min, pyrite addition amounts of 5.00 mass% and concentrates particle size of 0.075 mm. The roasting products can meet the standard of BF ironmaking, which requires tin content in iron ores less than 0.08 mass%, and the tin removed can be recycled through smoke dust collection.

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“…As the selected composites differ in the iron oxide content, the results of heating experiments will be affected by their phase transformation. The samples were heated in two atmospheres, in reductive [17] to the temperature 300 °C and in inert up to 650 °C with the aim to investigate the changes in their surface and structural properties.…”

Section: Introductionmentioning

confidence: 99%

Surface and Structure Study of Clay-Based Composites After Thermal Treatment

Mockovčiaková

Danková

Briančin

2013

AFST

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The composite materials prepared from clay and iron oxides in different weight ratios and temperatures denoted as A85 and E20 were heated at 300 °C in reductive atmosphere and up to 650 °C in inert atmosphere. The changes in the structure, surface and pore properties were examined by XRD, N 2 adsorption method and TG, DTA method. The morphology was studied using scanning electron microscope. The heating of composites up to temperature 300 °C in the reductive atmosphere caused the transformation of the present oxide phases. The distribution curve of the heated composites is narrower and is shifted to the lower pores. The composites heated up to 650 °C in the N 2 atmosphere showed to the transformation of iron oxide phases to hematite; the composites contained less pores, became denser and due to sintering of iron oxides particles a decrease in specific surface area was observed.

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Hematite to magnetite reduction monitored by Mössbauer spectroscopy and X-ray diffraction

Cited by 61 publications

References 8 publications

XRD, HRTEM, magnetic and Mössbauer studies on chemically prepared Fe3+-doped nanoparticles of cerium oxide

XRD, HRTEM, magnetic and Mössbauer studies on chemically prepared Fe3+-doped nanoparticles of cerium oxide

Reduction Roasting of Tin-Bearing Iron Concentrates Using Pyrite

Surface and Structure Study of Clay-Based Composites After Thermal Treatment

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