Erosion of refractory material by ring-forming product in grate-rotary kiln pelletizing process
YAO Fei1, ZHANG Xingkai1, YIN Xiao2,3, WANG Zhe1, ZHENG Bing3,4, XU Dong2,3
1. Whole Processes of High Quality Fastener Application Technology Research Center of Universities in Hebei Province, Hebei Taihang Iron and Steel Group Co., Ltd., Handan 056305, Hebei, China; 2. Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province, Hebei University of Engineering, Handan 056038, Hebei, China; 3. Meson Technology Hebei Co., Ltd., Handan 056000, Hebei, China; 4. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China
Abstract：In the grate-rotary kiln pelletizing process, the problem of ring-forming product erosion of refractory material is potential hazard in production. Based on the actual problems that occurred in the grate-rotary kiln process with an annual output of 1.2 million tons pellets, the path and mechanism of ring-forming product erosion of refractory material were analyzed. The results show that solid solution mineralization of refractory by Fe2O3 component in the ring-forming product is the main driving force for its erosion. Moreover, the migration and infiltration of free Fe2O3 microcrystals leads to the gradual deepening of refractory erosion. In the mode of pulverized coal injection in rotary kiln, the formation of abnormal pellets with outer shell after reparation and restart of the rotary kiln is attributed to the low melting point fly ash produced by pulverized coal combustion. Combined with the analysis of mineralogical composition and the cause of abnormal pellets with outer shell, it is known that fly ash is potential participant in the erosion behavior of ring-forming product on refractory material. The research results can provide guidance for control and prevention of ring-forming product erosion in rotary kiln.
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2023, Vol. 33 
