China's Refractories

《中国耐火材料》英文版

China's Refractories ›› 2023, Vol. 32 ›› Issue (4): 1-7.DOI: 10.19691/j.cnki.1004-4493.2023.04.001

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Preparation and Properties of SiC Assembled Large Block for Blast Furnace Tuyeres

LYU Chunjiang*, CHANG Cheng, HUANG Yifei, CAO Huiyan, LI Jie, ZHU Chong   

  1. State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China
  • Online:2023-12-15 Published:2023-12-21
  • Contact: *e-mail: lylvcj@126.com
  • About author:Lyu Chunjiang, born in 1979, gained his master’s degree from Sinosteel Luoyang Institute of Refractories Research Co., Ltd. in 2007. He has been working there since 2007. He is mainly focused on the improvement and application of silicon carbide refractories.

Abstract: A SiC assembled large block for blast furnace tuyeres was prepared using silicon carbide particles (3-1 and 1-0.088 mm) and fine powder (<0.088 mm), silicon powder (<0.088 mm), industrial carbon black (N990), microsilica,ρ-Al2O3 powder, etc. as raw materials. The developed block was compared with a silicon nitride bonded silicon carbide brick, a self-bonded silicon carbide brick and an imported self-bonded silicon carbide block to analyze and evaluate their service performance. The results show that: (1) in the 0-100 mm zone, the SiC large block mainly consists of β-SiC and nitrides such as O’-SiAlON, β-SiAlON, α-Si3N4, and Si2N2O, the bulk density is 2.68-2.70 g·cm-3, the apparent porosity is 14%-15%, and the material structure is uniform; (2) in the 0-100 mm zone, β-SiC nano-whiskers intercalate with nitrides; with the depth increasing, the number of flocculent β-SiC nano-whiskers increases, while the number of nitrides decreases; when the depth reaches 150 mm or more, the main bonding phases are β-SiC and mullite; (3) compared with the reference products, the developed SiC large block has a good basic performance, and after alkali corrosion, the mass change rate is -0.1%, which is obviously superior to the imported self-bonded silicon carbide and the homemade silicon nitride bonded silicon carbide materials.

Key words: blast furnace for iron-making, tuyere, silicon carbide, alkali corrosion resistance