Nitrogen oxide (NO) and sulfur dioxide (SO₂) are the major environmental pollutants generated from the steel industry. The sintering process of iron ores accounts for more than 40 and 70 pct of the total emission of NO and SO₂ from the steel industry. The current study aims to clarify the effects of the hearth layer used in the sinter bed on the reduction of NO and SO₂. It was attempted to examine the potential of several materials in reducing NO and SO₂ such as the hearth layer commonly applied in the steel plants, reagent-grade FeO, mill-scale, reagent-grade CaO, and calcined dolomite. The fractional reduction of NO (\({\eta }_{\text{NO}}\)) was directly proportional to the FeO content in the materials. The effects of experimental variables such as temperature, specimen arrangement, and oxygen addition to inlet gas mixture on the fractional reduction of NO (\({\eta }_{\text{NO}}\)) were evaluated. In case the sample was placed perpendicular to the flow of gas at high temperatures, the reduction of NO (\({\eta }_{\text{NO}}\)) was improved. However, the increase of oxygen in the inlet gas decreased the reduction of NO. Reagent-grade FeO and mill-scale were effective at 423 K (150 °C) for reducing NO in coal combustion, while reagent-grade CaO and calcined dolomite facilitate the reduction of SO₂ at 773 K (500 °C). Based on the results, it was suggested to replace the hearth layer in the sinter bed with mill-scale in the low-temperature zone and calcined dolomite in the high-temperature zone, which would provide the best reduction ratio of NO and SO₂.

一氧化氮（NO）和二氧化硫（SO ₂）是钢铁工业产生的主要环境污染物。铁矿石的烧结过程占钢铁行业NO 和 SO _{2总排放量的 40% 和 70% 以上。}本研究旨在阐明烧结床中使用的炉床层对减少 NO 和 SO ₂的影响。尝试检查几种材料在减少 NO 和 SO ₂方面的潜力，例如钢厂常用的炉床层、试剂级 FeO、轧制氧化皮、试剂级 CaO 和煅烧白云石。NO ( \({\eta }_{\text{NO}}\)的分数减少) 与材料中的 FeO 含量成正比。评估了温度、试样排列和向入口气体混合物中添加氧气等实验变量对 NO ( \({\eta }_{\text{NO}}\) ) 分数还原的影响。如果样品在高温下垂直于气流放置，则 NO ( \({\eta }_{\text{NO}}\) ) 的还原得到改善。然而，入口气体中氧气的增加减少了 NO 的还原。试剂级 FeO 和轧制氧化皮在 423 K (150 °C) 下可有效减少燃煤中的 NO，而试剂级 CaO 和煅烧白云石促进 SO _2的还原在 773 K (500 °C)。根据研究结果，建议在低温区用氧化皮代替高温区用煅烧白云石代替烧结床炉床层，这样可以提供最佳的NO和SO ₂还原率。