粒铁是由碎铁矿、焦屑（或硬煤粉）和熔剂，在回转炉内较高温度下还原成半熔状产物，经冷却、破碎、磁选、去渣而获得的产品。含硫量较低的可直接用于炼钢，较高的一般用作高炉炉料。优点是可利用含二氧化硅高的贫铁矿和劣质燃料进行大规模生产。
在场的球粒铁在多尘样本显示出铁水广泛分散。
The presence of spherules of iron in multiple dust samples is indicative of molten iron widely dispersed.
在一定的铁液深度和铁液硫含量时，金属镁粒铁水脱硫时镁的利用率随镁粒的粒径增加而减小；
More bigger of the radius of solid magnesiums are, more longer of the residence time and the rate of the magnesium bubble become, and little of the mass transfer coefficient are in the hot metal.
另外大量之高温塑性变形可以产生较小之肥粒铁晶粒这样可以抵消高温热浸温度所造成之晶粒粗大效应。
Large amounts of deformation can lead to smaller ferrite grains which can balance the high temperature soaking effect.
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