Emission Behavior and Physicochemical Properties of Aerosol Particulate Matter (PM_10/2.5) from Iron Ore Sintering Process

摘要

Iron ore sintering process is the major emission source of PM_(10/2.5) (aerosol particulate matters less than 10 μ m/2.5 μ m in aerodynamic diameter) in integrated steelworks. The aim of this investigation is to obtain the emission behavior and major inorganic characteristics of PM_(10/2.5) from typical sintering stages. Particulate matters were collected and classified into different size fractions with a cascade impactor, and the properties of PM_(10/2.5) were analyzed by XRF, SEM-EDS techniques. The results show that sintering stages initiated from the gradual disappearing process of over-wetted layer to the burning through point are the main emitting area of PM_(10), and sintering bed has potential ability to scrub PM_(10) from flue gas. The main chemical composition of PM_(2.5) emitted from the beginning of an integrated sintering process to the point where flue gas temperature began to rise characterizes high contents of Fe and low contents of volatile trace elements; PM_(2.5) emitted from the flue gas temperature rising process characterizes high contents of K, Pb, Cl and S, and low content of Fe for the first half, while characterizes high contents of Al, Si, and low content of Fe for the second half. Such information can be helpful in exploiting controllable technologies on disposing PM-related pollutants in practice.