ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effect of MnO on High-Alumina Slag Viscosity and Corrosion Behavior of Refractory in Slags
Renze XuJianliang ZhangXiaoyue FanWeiwei ZhengYongan Zhao
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2017 Volume 57 Issue 11 Pages 1887-1894

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Abstract

The influence of MnO on viscosities of CaO–SiO2–MgO–Al2O3–Cr2O3-based slags and the corrosion mechanism of carbon composite brick used in blast furnace hearth by slags was investigated in this work. From the viscosity experimental results, it was indicated that the viscosity decreased with the addition of MnO. The break point temperature decreases from 1655 to 1632 K and the apparent activation energy decreases from 217.54 to 185.90 kJ mol−1 with the increasing MnO content from 0 to 3 wt.%. The FTIR spectra analyses revealed that MnO exists as a network modifier and the polymerization degree of the slag decreases with the rising content of MnO. The corrosion of carbon composite brick by molten slag could be a consequence of dissolution, slag penetration and slag-refractory reaction, and the degradation of the brick becomes intenser with the addition of MnO.

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© 2017 by The Iron and Steel Institute of Japan
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