ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Dissolution Behavior of Al2O3 in Refining Slags Containing Ce2O3
Yan Qiang LiuLi Jun WangKuo Chih Chou
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2014 Volume 54 Issue 4 Pages 728-733

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Abstract

The effects of rotating speed, temperature and slag composition on the dissolution rate of alumina rod in molten CaO–SiO2–Al2O3–MgO and CaO–SiO2–Al2O3–MgO–Ce2O3 slag were investigated by the rotating cylinder method in the temperature range of 1793 K to 1853 K. It was indicated that faster rotating speed and higher temperature would result in an increasing of dissolution rate of alumina. The concentration profiles of Al, Ca, Ce etc. in the boundary layer as well as slag were determined by EDS analysis. Based on these results, the mechanism of dissolution of Al2O3 rod in Ce2O3 containing slag was discussed, and the apparent activation energy in the dissolving process were obtained in the range of 233–418 kJ/mol. The addition of Ce2O3 initially increased the dissolution rate of Al2O3, while hindered afterwards, which is explained from the view point of mass transfer coefficient.

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© 2014 by The Iron and Steel Institute of Japan
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