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| Synthesis of Mg-Fe-Al Composite Spinel by Carbon Thermal Reduction Method |
Yanhui WANG, Shujiang CHEN( ), Guohua LI, Lin TIAN, Lijie SUN |
| College of High Temperature Materials and Magnesium Resource Engineering, Liaoning University of Science and Technology, Anshan 114051, China |
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Cite this article:
Yanhui WANG, Shujiang CHEN, Guohua LI, Lin TIAN, Lijie SUN. Synthesis of Mg-Fe-Al Composite Spinel by Carbon Thermal Reduction Method. Chinese Journal of Materials Research, 2018, 32(5): 365-370.
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Abstract Mg-Fe-Al composite spinel was synthesized via carbon thermal reduction method at 1550℃ with a size of ?20 mm×10 mm. The phase composition and the microstructure of the prepared composite spinel was characterized by X ray diffractometer and scanning electron microscopy respectively. The lattice constant and the unit cell volume of the Mg-Fe-Al composite spinel were calculated by combining the interplanar spacing of the specific crystal plane. Potassium dichromate volumetric method was used to determine the content of ferrous oxide in the composite spinel. Results show that two kinds of Mg-Fe-Al composite spinel with different morphology were produced,of which the lattice constant and unit cell volume are larger than those presented in standard cards for MgO·Al2O3 and the main peaks of which shift to the lower angle side. A small amount of MgO and Al2O3 were reduced by C forming Mg- and Al-vapor, which then react with CO and O2 depositing as acicular MgO·Al2O3. The presence of liquid phase at high temperature promoted the formation of Al15.99Mg7.64Fe0.37O32 phase. A large amount of MgO and Al2O3 reacted directly to form granular MgO·Al2O3, Fe2+ and Fe3+ diffused into MgO·Al2O3 crystallites to form Mg8.13Al14.25Fe1.13O32 phase. The content of FeO in the composite spinel was 2.38% measured by potassium dichromate volumetric method.
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Received: 07 June 2017
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