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比利时目前正开发一种称为Comet的工艺,该工艺是用粉矿和煤生产优质海绵铁。它采用转底炉,与其它转底炉直接还原工艺(如Inmetco和Fastmet)的区别在于不需将铁矿与煤粉混合造块,而是将煤层(混有少量的石灰)和铁矿粉交替布于炉床上。这样的混合物可使温度很快上升至1300℃以上,此温度比常用直接还原工艺高。Comet工艺通过煤气烧嘴加热。 通过安装在炉子出口处的筛分机,很容易将直接还原铁与富余的煤粉、石灰、煤的灰分和硫化
Belgium is currently developing a process called Comet, which produces high-quality sponge iron from fines and coal. It uses a rotary hearth furnace, and other rotary hearth direct reduction process (such as Inmetco and Fastmet) The difference is that the iron ore and coal do not need to mix block, but the seam (with a small amount of lime mixed with iron ore powder Alternate cloth on the hearth. Such a mixture allows the temperature to rise rapidly above 1300 ° C, which is higher than the usual direct reduction process. Comet process is heated by a gas burner. With the screening machine installed at the exit of the furnace, it is easy to combine direct reduced iron with surplus pulverized coal, lime, coal ash and sulphidation