Iron and steelmaking process, especially the iron ore sintering process is regarded as a major fixed generation source of PM2.5. This study aims to obtain fundamental knowledge on the grain size and chemical composition of PM2.5 formed during sintering process. A laboratory-scale sintering simulator was used to simulate the iron ore sintering process, and a part of the outlet gas was introduced to a cascade impactor to collect the PM2.5 in particle size stepwise. Concentration of PM in the outlet gas became highest when the admixing ratio of CaO was set at 20 mass%, and it appears that there are two different formation patterns of PM in different size. Obtained PM with the particles size from 0.25 to 2.5 µm were composed of hematite, calciumferrite and some gangue materials. The liquidus temperature of CaO (20%) - Fe₂O₃ is lower than the maximum sintering bed temperature and therefore iron oxides in the melt tend to be reduced at coke surface promote to form CO bubbles. Then the bubbles move to the melt surface and burst forming many fine droplets. PM with the particles size less than 0.25 µm contains sulfates of Na, K and Ca in addition to hematite and calciumferrite. When coke containing a certain sulfur was replaced by graphite, the major components of the formed PM (−0.25 µm) was chlorides of Na and K.

钢铁制造过程，尤其是铁矿石烧结过程被认为是PM2.5的主要固定来源。这项研究旨在获得有关烧结过程中形成的PM2.5的粒度和化学成分的基础知识。使用实验室规模的烧结模拟器来模拟铁矿石的烧结过程，并将一部分出口气体引入级联撞击器中，以逐步收集颗粒大小的PM2.5。当CaO的混合比设定为20质量％时，出口气体中PM的浓度最高，并且似乎存在两种不同尺寸的PM的形成模式。获得粒径为0.25至2.5 µm的PMm由赤铁矿，铁酸钙和一些脉石材料组成。CaO（20％）-Fe ₂ O ₃的液相线温度低于最高烧结床温度，因此熔体中的铁氧化物倾向于在焦炭表面还原，从而促进形成CO气泡。然后气泡移动到熔体表面并破裂形成许多细小液滴。粒径小于0.25 µm的PM除含有赤铁矿和亚铁酸钙外，还含有Na，K和Ca的硫酸盐。当含有一定硫焦炭是由石墨代替，所形成的PM（-0.25的主要部件μ m）代替Na和K的氯化物