Reduction kinetics of mechanically activated hematite concentrate with hydrogen gas using nonisothermal methods

Pourghahramani, Parviz; Forssberg, Eric

doi:10.1016/j.tca.2006.12.023

Cited by 72 publications

(46 citation statements)

References 43 publications

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“…[10][11][12] These expressions are generally applied for the kinetic analysis of gas-solid state reactions and encompass most common mechanism. However, eq.…”

Section: Resultsmentioning

confidence: 99%

Study on the Reduction of Molybdenum Dioxide by Hydrogen

Kim

Jeon

et al. 2008

Mater. Trans.

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The reduction of MoO 2 powder by hydrogen is one of the most important steps for manufacturing ferromolybdenum alloy and molybdenum powder. The results of experiments on the kinetics of this reaction are presented in this paper. The experiments were carried out under nonisothermal condition in hydrogen atmosphere using TGA equipment. The nonisothermal experiments were carried out at various linear heating rates up to 1273 K. It was found that the reduction reaction is very fast under the whole heating rate until the reduction ratio of MoO 2 approaches to about 0.92. The reduction ratio of MoO 2 was about 0.98 after finishing the reduction reaction at a heating rate of 4 K/min. Kinetics of the reaction was analyzed from the dynamic TGA data by means of Coats and Redfern equation. The nucleation and growth model yielded a satisfactory fit to these experimental data.

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“…[10][11][12] These expressions are generally applied for the kinetic analysis of gas-solid state reactions and encompass most common mechanism. However, eq.…”

Section: Resultsmentioning

confidence: 99%

Study on the Reduction of Molybdenum Dioxide by Hydrogen

Kim

Jeon

et al. 2008

Mater. Trans.

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show abstract

“…The conclusions can be drawn as follows: Table 1 List of the kinetic models [7][8][9][10][11][12][13].…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] to fit the experimental results, it is found that model 1 and 2 give the best fittings but none of them can describe the experimental results very well alone. Fitting results are shown in Fig.…”

Section: High Temperaturementioning

confidence: 99%

Study on hydrogen reduction of Mo4O11

Dang

Zhang

Wang

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…In other words, the internal diffusion resistance is negligible at initial stage and becomes more and more significant at later stage. 25,26) Simultaneously, the intercepts of the lines decrease with the reaction progress, which indicates that the k + increases while the η c (reaction resistance) decreases with the reaction progress for each reduction temperatures. Moreover, the intercepts at initial stages generally declined with the increase of temperature, so it provides evidence that the reaction resistance generally declined with the increase of temperature.…”

Section: Kinetics Analyzingmentioning

confidence: 91%