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高炉和COREX工艺对铁矿球团的质量提出了要求。铁矿球团的质量由生球质量和焙烧参数决定。生球特性由矿石的成球行为和矿石特性决定,矿石特性包括矿石的化学成分、矿石本质(硬度)、比表面积和粒度分布。金达尔钢公司的铁矿石来自Bellary-Hospet地区的不同矿点。用于实验室研究的3种铁矿粉(矿1、矿2和矿3)来自3个不同的矿点。用矿1、矿2、矿3和矿4(混矿)制成不同的生球。矿石的邦德功指数的变化范围为6～11kWh/t。从矿石的本质来说,矿1较软,而矿3较硬,其硬度范围为:1～3。矿石的粒度范围为:-45μm占56%～68%。为理解矿石粒度对生球特性的影响,研究了生球的落下次数、压溃强度,干燥后压溃强度,孔隙度和堆密度。随着矿石粒度的降低,平均落下次数增加。平均落下次数的变化范围为6.5～14.7,不同矿石的生球落下次数的排序为矿1>矿2>矿4>矿3。矿1、矿2和矿4的生球GCS和DCS随着-45μm部分比例的增加而提高,在64%时达到最大值,而后随着-45μm部分比例的继续提高而降低。生球的GCS和DCS变化范围分别为1.35～2.77kg/p和2.3～5.4kg/p。生球的孔隙度随着矿石粒度的降低而下降,矿3的孔隙度较高,矿1的孔隙度较低,这和矿石的硬度相关。生球的堆密度随矿石粒度的降低而增大。生球的堆密度范围为2.0～2.3kg/m3,生球堆密度顺序为矿1>矿4>矿2>矿3。
Blast furnaces and COREX processes set the requirements for the quality of iron ore pellets. The quality of iron ore pellets is determined by green ball quality and roasting parameters. The green ball properties are determined by the ball formation behavior and ore properties of the ore. The ore properties include the chemical composition of the ore, the nature of the ore (hardness), the specific surface area and the particle size distribution. Jindal Steel’s iron ore comes from different sites in the Bellary-Hospet area. The three iron ore fines (Mine 1, Mine 2 and Mine 3) used for laboratory studies come from 3 different mine sites. Mine 1, mine 2, mine 3 and mine 4 (mixed mine) made of different balls. The ore Bond power index range of 6 ~ 11kWh / t. From the nature of ore, ore 1 is softer, while ore 3 is harder with a hardness range of 1 to 3. Ore size range: -45μm accounted for 56% to 68%. In order to understand the effect of ore size on the properties of green pellets, the dropping times, crushing strength, crushing strength, porosity and bulk density of green pellets were studied. As the ore size decreases, the average number of drops increases. The average falling times varied from 6.5 to 14.7. The order of the dropping times of green balls for different ores was mine1> mine2> mine4> mine3. The GCS and DCS of raw spheres of ore mines 1, 2 and 4 increased with the increase of the -45μm fraction, reaching the maximum at 64% and then decreasing with the -45μm fraction increasing. The range of GCS and DCS of green pellet were 1.35 ~ 2.77kg / p and 2.3 ~ 5.4kg / p, respectively. The porosity of green pellets decreases with the decrease of ore size. The higher the porosity of ore 3, the lower the porosity of ore 1, which is related to the hardness of ore. The density of green pellets increases with decreasing grain size. The density of green pellets ranged from 2.0 to 2.3 kg / m3, and the order of density of green pellets was mine1> mine4> mine2> mine3.