The catalytic activities of iron concentrate, rare earth concentrate, and rare earth tailings for semi-coke denitration were studied using thermogravimetric analysis combined with Fourier transform infrared spectroscopy. The results revealed that less NO was produced from semi-coke combustion with the addition of iron and rare earth minerals, and meanwhile CO production was reduced as well. It is likely that the addition of iron and rare earth minerals enhances the homogeneous reduction of NO by CO thus improving the removal efficiency of nitrogen oxides. The catalytic activity of rare earth tailings was higher than those of rare earth concentrate and iron concentrate. It is evidenced that ferric oxide and rare earth oxides in the tailings are associated, synergically catalyzing the homogeneous reduction of NO by CO.

利用热重分析结合傅里叶变换红外光谱技术研究了铁精矿，稀土精矿和稀土尾矿对半焦脱硝的催化活性。结果表明，通过添加铁和稀土矿物质，半焦燃烧产生的NO更少，同时CO的产生也减少了。铁和稀土矿物的添加可能会增强CO对NO的均匀还原作用，从而提高氮氧化物的去除效率。稀土尾矿的催化活性高于稀土精矿和铁精矿。有证据表明，尾矿中的三氧化二铁和稀土氧化物结合在一起，协同催化一氧化碳对一氧化氮的均匀还原。