Acta Metallurgica Sinica (English Letters) ›› 2009, Vol. 22 ›› Issue (6): 454-460.DOI: 10.1016/S1006-7191(08)60123-4

• 研究论文 • 上一篇    下一篇

THE MECHANISM OF ZINC DAMAGING ON BLAST FURNACE TUYERE REFRACTORY

杨雪峰   

  1. 云南省昆明钢铁公司
  • 收稿日期:2009-02-23 修回日期:2009-04-14 出版日期:2009-12-25 发布日期:2009-12-16
  • 通讯作者: 杨雪峰

Mechanism of zinc damaging to blast furnace tuyere refractory

Xuefeng YANG1,2, Mansheng CHU3, Fengman SHEN3, Zhuming ZHANG2   

  1. 1) School of Minerals Processing and Bio-engineering, Central South University, Changsha 410083, China
    2) Technology Center, Kunming Iron and Steel Limited Company, Kunming 650302, China
    3) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2009-02-23 Revised:2009-04-14 Online:2009-12-25 Published:2009-12-16
  • Contact: Xuefeng YANG

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摘要：

The phenomena of tuyere upward-warp have been found at No. 6 blast furnace in Kunming Steel Company China after its blow-in, which has made a great impact on the practical production of the furnace. Thus, a number of efforts have been made to elucidate the mechanism of this phenomenon. At first, the results of investigation and tests revealed that the enrichment and expansion of zinc in tuyere bricks is main factor to lead to the tuyere upward-warp. The eroding behavior of zinc is that the inner structure of tuyere bricks turns from dense to loose with entering, enriching and expanding of zinc, which forms spot-like → stripe-like → ditch-like → vein-like→ tumor-like eroding passage. Additionally, it is found that the sequence of deleterious elements entering the tuyere refractory is K, Na, Zn and Pb, respectively. Finally, the phenomena and process of zinc crystallization and growth in the refractory have been clearly observed and recorded during this investigation.

关键词: blast furnace, tuyere, refractory, zinc, erosion, deleterious elements

Abstract:

The phenomena of tuyere upward-warp have been found at No.6 blast furnace in Kunming Steel Company China after its blow-in, which has made a great impact on the practical production of the furnace. Thus, a number of efforts have been made to elucidate the mechanism of this phenomenon. The results of investigation and tests revealed that the enrichment and expansion of zinc in the tuyere bricks is the main factor leading to the tuyere upward-warp. The eroding behavior of zinc is that the inner structure of the tuyere bricks turns from dense to loose with entering, enriching and expanding of zinc, which forms spot-like→stripe-like→ditch-like→vein-like→tumor-like eroding passage. Additionally, it is found that the sequence of deleterious elements entering the tuyere refractory is K, Na, Zn and Pb, respectively. Finally, the phenomena and process of zinc crystallization and growth in the refractory have been clearly observed and recorded during this investigation.

Key words: Blast furnace, Tuyere, Refractory, Zinc, Erosion, Deleterious elements