Reducing NO_x emission of iron ore sintering process in a cost effective manner is a challenge for the iron and steel industry at present. Effects of the proportion of mill scale and coke breeze on the NO_x emission, strength of sinter, and sinter indexes were studied by combustion and sinter pot tests. Results showed that the peak value of NO concentration, total of NO emission, and fuel-N conversion rate gradually decreased as the proportions of the mill scale increased because NO was reduced to N₂ by Fe₃O₄, FeO, and Fe in the mill scale. The strength of sinter reached the highest value at 8.0wt% mill scale due to the formation of minerals with low melting point. The fuel-N conversion rate slightly fluctuated and total NO_x emission significantly decreased with the decreased proportions of coke breeze because CO formation and content of N element in the sintered mixture decreased. However, the sinter strength also decreased due to the decrease in the amount of the melting minerals. Furthermore, results of the sinter pot tests indicated that NO_x emission decreased. The sinter indexes performed well when the proportions of mill scale and coke breeze were 8.0wt% and 3.70wt% respectively in the sintered mixture.

以具有成本效益的方式减少铁矿石烧结过程中的NO _x排放是目前钢铁行业面临的挑战。工厂规模和焦粉对NO的比例的影响_X排放，烧结矿的强度，并通过燃烧和烧结杯试验研究烧结指标。结果表明，NO浓度、NO排放总量和燃料-N转化率的峰值随着氧化皮比例的增加而逐渐降低，这是因为NO被Fe ₃ O ₄还原为N ₂、FeO 和铁皮中的 Fe。由于形成了低熔点矿物，烧结矿的强度在 8.0wt% 的氧化皮下达到了最高值。随着焦粉比例的降低，燃料-N 转化率略有波动，NO _x排放总量显着降低，这是因为烧结混合物中的 CO 形成和 N 元素含量降低。然而，由于熔融矿物量的减少，烧结强度也降低。此外，烧结罐测试的结果表明NO _x排放减少。当烧结混合物中氧化皮和焦粉的比例分别为8.0wt%和3.70wt%时，烧结指标表现良好。