The FASTMET process is clearly different fromthe gas-based reduction process using reforming gasderived from natural gas, in that it heats and reducescomposite agglomerates, each consisting of iron ore,or steel mill waste, and coal. This simple and uniqueprocess involving rapid heating accomplishes arapid reduction reaction. The agglomerates areplaced in one or two even layers over the hearth andare heated using radiation heat. This prevents theoxidation of agglomerates, despite the in-furnacecondition of combustion exhaust gas, which has asignificant oxidation potential 1). It is important tomention that the process can achieve the heatingand reducing of the agglomerates simultaneouslyand effectively at an ideal air-gas ratio in a furnace. Inaddition, the combustible gas generated from thecarbon in the agglomerates burns in secondarycombustion above them. This significantly suppressesthe emission of NOx, despite the fact that this is afurnace that burns at high temperatures, anotherfeature of the FASTMET process.
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