Effect of aspect ration on compressive force distribution in the iron ore briquette

초록

In ironmaking, sizes of iron ore and coal should be adjusted or agglomerated for later process blast furnace. The particle size of the iron ore is preferably 10-30 mm in diameter. Fine ore less than 10 mm in diameter is agglomerated by the sintering process and ultra-fine ore less than 44 mm in diameter is agglomerated by the pelletizing process. The depletion of high grade iron ore in recent years necessitates a technology that can utilize low grade ultra-fine ores. To achieve this, steelmakers have been studying the sinter?briquette complex firing process that is a method of charging the sinter feed together with briquettes made of ultra-fine ore. In this process, Larger briquettes increase productivity per unit time but decrease green strength and can break during transportation and charging. So, the shape design of the briquettes is very important. Therefore, in this study simulated twin roll briquetting process by numerical method using discrete element method(DEM) and compared compressive force distribution in briquette according to aspect ratio. Based on this analysis result, the proper shape of the briquette for the complex firing process was considered.