[Characterization of Particle Size Distributions of the No-organized Lead Emission for a Lead and Zinc Smelter]

Using TH 880-F type dust tester and low pressure impactor (LPI), the size-segregated atmospheric particulates were collected, the particle size distribution characteristics and the content of lead were analyzed in the unorganized emission area (1 and 2) from the Blast and ISA furnaces within a lead-zinc smelter in Yunnan province. The results showed that lead in PM_2.5(fine particulate matter, particle size <2.5 μm) accounted for 66.6% and 43.1% of PM₁₀(particulate matter, particle size <10 μm) and TSP(total suspended particle, particle size<100 μm) in unorganized emission area 1, and the corresponding proportions in the unorganized emission area 2 were 54.1% and 38.7%, all these showed that the lead pollution mainly existed in small size particles. There was a close correlation between the lead content in the unorganized emission particulate matter and the wind direction and wind speed in the surface meteorological data, followed by the wind energy density. In lead smelting area, the correlation of lead content in the unorganized emission particulate matter with the wind direction and wind speed was the highest, followed by the wind energy density w. In the slag field, the correlation between lead content in the unorganized emission particulate matter and the vertical distribution of the temperature (γ) of the boundary layer was the highest, followed by the component u and v, and then the wind energy density w.