Effect of CaCO3 decomposition on fluxed pellets strength
LIU Wen-qiang1, HAN Chuang-chuang2, LI Jie1, YANG Ai-min1, LI Fei3, LI Da-liang3
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Technology Center, HBIS Group Hansteel Company, Handan 056000, Hebei, China; 3. Ironmaking Department, Shanxi Jianlong Industry Co., Ltd., Yuncheng 043801, Shanxi, China
Abstract：During the preheating and roasting process of iron concentrate powder, the heat will change and it will affect the compressive strength of pellets. To explore the mechanism of the decomposition of CaCO3 in flux on the strength of flux pellets Through TG-DSC analysis technology, the law of heat change under the interaction of iron powder, different iron powder mixed, iron powder mixed with flux, and the effect of heat change on the compressive strength of pellets were studied. By adjusting the calcination temperature and time, the flux pellets could reach the strength of ordinary acid pellets. The results showed that the interaction between iron powder was not obvious. From 700 to 850 ℃, the iron concentrate powder interacts with limestone powder, and the oxidation reaction of magnet fine powder can promote the decomposition of limestone. The experimental value of the TG curve appeared earlier than the theoretical value. Limestone decomposition behavior had an obvious inhibitory effect on the oxidation and consolidation of magnetite pellets. The flux pellets could reach the strength of ordinary acid pellets by prolonging the calcination time. After increasing the calcination temperature, the strength of flux pellets was obviously enhanced, which was increased by about 50 N/ball compared to ordinary acid pellets.
刘文强, 韩闯闯, 李杰, 杨爱民, 李飞, 李大亮. CaCO3分解对熔剂性球团强度的影响[J]. 钢铁, 2020, 55(12): 18-23.
LIU Wen-qiang, HAN Chuang-chuang, LI Jie, YANG Ai-min, LI Fei, LI Da-liang. Effect of CaCO3 decomposition on fluxed pellets strength[J]. Iron and Steel, 2020, 55(12): 18-23.
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2020, Vol. 55 
