1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China 2. Iron Plant, Shanghai Meishan Iron and Steel Co., Ltd.,Nanjing 210039, Jiangsu, China
Abstract��The main consolidation style of pellets is solid phase consolidation of hematite particles that are consolidated by recrystallization which results in certain strengthening of pellets. In order to study the influence of hematite morphologies on the strength of pellets, the hematite was divided into three types according to morphologies: large particle hematite, interconnected hematite with small particle and magnetite- hematite interwoven structure. The microscopic mechanical properties of the three different forms of hematite in two kinds of pellets were investigated to analyze the influence mechanism of hematite morphology on the strength of pellets. The results show that big particle hematite and magnetite- hematite interwoven structure have good comprehensive microscopic mechanical properties. In order to increase the content of magnetite- hematite interwoven structure in the pellets, proportion of the unoxidized magnetite should be appropriately increased during oxidizing roasting process; in addition, recrystallization time should be increased as much as possible for improving the interconnection condition of hematite, promoting the formation of larger particles hematite and improving the compressive strength of pellets.
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2017, Vol. 29 
