讨论了高铁赤泥煤基直接还原特性及还原过程中金属铁晶粒成核及晶核长大特征。研究结果表明，由于还原过程中生成了铁橄榄石和铁尖晶石，使得金属铁晶核更加难成；新相一旦形成后，铁橄榄石和铁尖晶石充当了成核剂，使得金属铁晶粒成核位垒降低，成核进度加快，其过程系“吸附－固相反应－自动催化”。 The direct reduction of high-speed railway red-mud coal-based coal and the nucleation and nucleation of metallic iron during the reduction process were discussed. The results show that due to the formation of feldspar and iron spinel reduction process, making the metal iron nuclei more difficult; once the new phase is formed, fayalite and iron spinel act as a nucleating agent, making the metal iron Barrier to reduce nucleation nucleation, nuclear progress accelerated, the process of “adsorption - solid-phase reaction - automatic catalysis.”