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本文研究了某高铁赤泥煤基直接还原过程中金属铁晶粒长大特性，并着重讨论了煤种及添加剂种类对金属铁晶粒长大特性的影响，得出了一些有意义的结论。
In this paper, the growth characteristics of metallic iron grains during the direct reduction of a high-speed railway red-mud coal-based coal were studied. The effects of coal species and additives on the growth characteristics of metallic iron grains were also discussed. Some meaningful conclusions were obtained.