Sticking Behavior of Burdens During Reduction Process in Gas‐Based Shaft Furnaces

Author:

Zhao Zichuan1ORCID,Tang Jue12ORCID,Wang Xiaoai3,Chu Mansheng24,Feng Jinge1,Liu Zhenggen25,Li Lanjie3

Affiliation:

1. School of Metallurgy Northeastern University Shenyang 110819 P. R. China

2. Liaoning Low‐Carbon Steelmaking Technology Engineering Research Center Northeastern University Shenyang 110819 P. R. China

3. Iron and Steel Research Institute HBIS Group Co., Ltd. Shijiazhuang 050000 P. R. China

4. Engineering Research Center of Frontier Technologies for Low‐carbon Steelmaking (Ministry of Education) Northeastern University Shenyang 110819 P. R. China

5. Institute for Frontier Technologies of Low‐Carbon Steelmaking Northeastern University Shenyang 110819 P. R. China

Abstract

Gas‐based shaft furnaces (SFs) have garnered considerable attention because of their low CO2 emissions. The sticking behavior of their burden material influences the smooth operation of SFs. In this study, the effects of the reduction degree, temperature, and atmosphere on the sticking behavior of pellets are studied thoroughly under typical reduction conditions. The results demonstrate that the pellets will stick with each other as the reduction degree increases, the main phase of pellets at the maximum sticking index (SI) is iron, and the interconnection between iron whiskers results in the bonding phenomenon of pellets. The pellets exhibit a low SI at a relatively low reduction temperature. As the reduction temperature increases, the pellets stick, which is caused by thermal expansion and the large number of iron whiskers. With an increase in the proportion of H2 in the reducing gas, the iron particles become smaller, and the contact area between the particles decreases, effectively reducing the SI of the pellets. In general, choosing a reasonable reduction temperature and increasing the proportion of H2 in the reducing gas are helpful in controlling pellet sticking.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

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