铁矿石烧结中焦粉的燃烧过程取决于焦粉的粒度。通过烧结试验，研究了焦粉粒度对烧结性能和质量的影响（针对含10% MAC粉的配矿）。通过降低细焦粉粒级（<0.25 mm和<1 mm）的百分比来增加焦粉平均粒度，从而可以明显提高烧结速度、成品率和生产率，而需要的焦粉量会更少。这是因为制粒后的烧结混合料里的较大焦粉颗粒燃烧效率更高，制粒效果更好，因而原始料层透气性和烧结透气性更好。能源利用率得到改进后，也会使烧结矿的RDI （还原粉化指数）改善。烧结矿矿相分析发现，即使用较粗焦粉的试验需要的燃料消耗率更低，但烧结成品包含的磁铁矿相更多，再生赤铁矿的含量更少。
The coke combustion process in iron ore sintering is dependent on the coke size. Therefore pilotscale sintering tests with blends containing different coke size distributions were carried out to investigate the effect of coke size (the ore blend contained 10% MAC marra mamba fines). It was found that increasing the coke mean size by reducing the percentage of the finer coke fractions (0.25 mm and -1 mm) led to a significant improvement in flame front speed, yield and productivity and a lower coke rate. This was due to more efficient combustion of larger coke particles in a granulated mix and also to better granulation and therefore higher green feed permeability and sintering permeability. The improved energy utilisation also produced sinter with a lower RDI (reduction degradation index). Sinter mineralogical analysis found that even though tests with coarser coke required lower fuel rates, the product sinters contained more magnetite phase and less secondary hematite.
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