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Carbothermic Reduction of Mullite at Elevated Temperature

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Abstract

A systematic investigation was conducted on the reduction of mullite by graphite at high temperatures ranging from 1773 K to 1873 K (1500 °C to 1600 °C) in an Ar atmosphere. The reaction products were identified as Al2O3, SiC, SiO, CO, and CO2. The overall reaction rate was accelerated by increasing the temperature, whereas the atmosphere gas flow rate had no significant influence on the reaction process. The reaction mechanism deducted from the experimental results indicated that the Boudouard reaction was a significant rate-controlling step.

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Abbreviations

T :

Temperature, K

ΔW :

Weight loss of the sample, g

\( M_{\text{CO}} \), \( M_{{{\text{CO}}_{2} }} \), \( M_{\text{SiO}} \) :

Molecular masses of CO, CO2, and SiO, respectively, g/mol

\( n_{\text{CO}} \), \( n_{{{\text{CO}}_{ 2} }} \),\( n_{\text{SiO}} \), \( n_{\text{SiC}} \) :

Mole numbers of generated CO, CO2, SiO, and SiC, respectively, mol

\( n_{\text{m}} \), \( n_{C} \) :

Mole numbers of reacted mullite and graphite, respectively, mol

\( n_{\text{m}}^{0} \), \( n_{\text{C}}^{0} \) :

Initial mole numbers of mullite and graphite in the sample, respectively, mol

\( n_{\text{Si}} \), \( n_{\text{O}} \) :

Mole numbers of Si and O involved in the reaction, respectively, mol

\( k^{\prime} \) :

Apparent reaction rate constant, 1/s

k :

Intrinsic reaction rate constant, cm/s

t :

Reaction time, s

r 0 :

Initial radius of spherical reactant powders, cm

E :

Activation energy of the reaction, kJ/mol

x :

Fractional conversions of reactants, subscript m represents mullite, and c represents graphite

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Authors and Affiliations

  1. School of Iron and Steel, Soochow University, Suzhou, 215021, Jiangsu, P.R. China

    Lan Hong (Professor)

  2. Sustainable Materials Research & Technology Centre, School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia

    Veena Sahajwalla (Professor)

Authors
  1. Lan Hong
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  2. Veena Sahajwalla
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Correspondence to Lan Hong.

Additional information

Manuscript submitted August 30, 2005.

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Hong, L., Sahajwalla, V. Carbothermic Reduction of Mullite at Elevated Temperature. Metall Mater Trans B 44, 1541–1545 (2013). https://doi.org/10.1007/s11663-013-9920-y

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  • DOI: https://doi.org/10.1007/s11663-013-9920-y

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