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Performance Studies on In Situ Spinel Solid Solution Bonded Periclase Refractories

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Abstract:

Specimens were prepared using iron-rich magnesia (3~1 mm、≤1 mm) and high purity magnesia (≤0.088 mm) as the main starting materials, adding tabular alumina at different size (3~2、2~1、≤1 mm) and content:3%、6%、9%、12%、15% to discover the influence of tabular alumina on sample performance. Phase composition and microstructure were also analyzed. The results show that specimen with content of 6% of corundum possessed the best comprehensive performance:apparent porosity 17%, bulk density 2.95 g·cm-3, cold crushing strength 74 MPa, refractoriness under load 1700 °C, heat shock resistance of up to 18 times. The formations of magnesium aluminate spinel and hercynite solid solution were enhanced by Fe ion at high temperatures in the iron-rich magnesia-corundum system at the presence of iron oxides, which are able to largely dissolved in periclase.

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Periodical:

Key Engineering Materials (Volume 633)

Pages:

245-248

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.633.245

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Online since:

November 2014

Authors:

Xin Lin, Yong Li, Yan Jing Li, Jun Jie Zhang, Chang He Gao, Ji Li Zhang

Keywords:

Cement Kilns, Iron-Rich Magnesia, MgFe2O4, MgFeAlO4, Sintered Corundum

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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