Abstract:The char (semi coke), a product of low-temperature pyrolysis of low metamorphic coal, can be used for blast furnace injection, which can reduce the coke ratio and save the cost of ironmaking. However, most of char is hard to grind, which limits its use. Two kinds of char in Shenmu and two kinds of injected coal are taken as the research objects, and their crushing characteristics are analyzed and compared. The phase composition of char and injected coal ash is detected by XRF and XRD, and the crushing morphology and microstructure of char and injected coal are studied by SEM and nitrogen adsorption. The results show that the grindability of coal is better than that of char, and the grindability of bituminous coal is the best; there is a synergy and inhibition relation between Ca、Si content and grindability: that is the more Ca content, the better the grindability, the Ca elements mainly exist in the form of CaO, and the effect of Si is opposite; the surface of coal is dense and flat, and the pore structure of the surface of char is developed. In the ball milling process, the coal is mainly broken by volume, while the char is mainly broken by surface. The main reason for the big difference in grindability is the different ways of breaking.
施瑞盟, 张龙, 邹冲, 吴浩, 何江永, 高雅琪. 兰炭和喷吹煤组成与结构特征对可磨性的影响[J]. 钢铁, 2020, 55(8): 86-92.
SHI Rui-meng, ZHANG Long, ZOU Chong, WU Hao, HE Jiang-yong, GAO Ya-qi. Effect of composition and structural characteristics of char and injected coal on grindability[J]. Iron and Steel, 2020, 55(8): 86-92.
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