China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2023, Vol. 32 ›› Issue (2): 24-30.DOI: 10.19691/j.cnki.1004-4493.2023.02.005

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Alkali Vapor Corrosion of Different Refractories at High Temperatures

FAN Muxu*, HOU Xiaojing, FENG Zhiyuan, WANG Han, LIU Pengcheng, SHI Gan   

  1. Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China
  • Online:2023-06-15 Published:2023-06-19
  • Contact: *e-mail: 404913797@qq.com
  • About author:Fan Muxu, born in 1990, received his master's degree in 2015. He has been working in Sinosteel Luoyang Institute of Refractories Research Co., Ltd., since 2015. He has committed himself for the research and development of oxide series refractories for more than 7 years. He is skilled in technical support and engineering guidance for Al2O3-SiO2, Al2O3-Cr2O3 and Al2O3-CaO refractories. He has more than 10 authorized patents.

Abstract: Commercial high purity corundum brick, corundum-mullite brick, mullite brick, calcium hexaaluminate brick and calcium hexaaluminate-corundum brick were studied to investigate their reaction state and alkali vapor corrosion mechanism at 1 370 and 1 500 ℃. The results show that: (1) served in hot alkali vapor, the high-purity corundum brick has no obvious slag layer but expands dramatically; (2) the corundum-mullite brick shows obvious reactive expansion at 1 370 ℃ and melting corrosion happens at 1 500 ℃; (3) at 1 370 ℃, alkali vapor and mullite brick react and form a slag layer without volume effect; when the temperature increases to 1 500 ℃, the reaction melting corrosion intensifies; (4) the calcium hexaaluminate brick and the calcium hexaaluminate-corundum brick form a thin slag layer in alkali vapor, and the sample surface absorbs Na+ to form a dense layer with small volume effect.

Key words: alkali vapor corrosion, sodium carbonate, calcium hexaaluminate, corundum, mullite