In the present study

three Zhundong coals with different contents of chlorine and AAEMs (alkali and alkali earth metals) were burned in a high temperature drop tube furnace. The derived particulate matter (PM) was collected with DLPI (Dekati Low Pressure Impactor) sampling system and discussions were performed based on the PM yield and composition. The coal with high contents of chlorine and AAEMs produced ultrafine PM with high contents of Na and Cl

which was of both higher mass yields and larger peak sizes than that of the other coal. The partitioning of Ca into PM was related to its mode of occurrence in coal. Ca in the two untreated coal was mainly migrated into coarse PM and contributed little to the formation of ultrafine PM as it was mostly in inorganic minerals in coal. The extra added HCl had no significant effects on the yield of ultrafine PM while resulted in much higher contents of Na and Cl. The results showed that increasing HCl would not significantly promote the mineral vaporization while it accelerated the formation of chlorides

which nucleated more easily and formed ultrafine PM.