title: [Characteristic of Mercury Emissions and Mass Balance of the Typical Iron and Steel Industry].
abstract: To preliminarily discuss the mercury emission characteristics and its mass balance in each process of the iron and steel production, a typical iron and steel enterprise was chosen to study the total mercury in all employed materials and estimate the input and output of mercury during the steel production process. The results showed that the mercury concentrations of input materials in each technology ranged 2.93-159.11 µg · kg⁻¹ with the highest level observed in ore used in blast furnace, followed by coal of sintering and blast furnace. The mercury concentrations of output materials ranged 3.09-18.13 µg · kg⁻¹ and the mercury concentration of dust was the highest, followed by converter slag. The mercury input and the output in the coking plant were 1346.74 g · d⁻¹ ± 36.95 g · d⁻¹ and 177.42 g · d⁻¹ ± 13.73 g · d⁻¹, respectively. In coking process, mercury mainly came from the burning of coking coal. The sintering process was the biggest contributor for mercury input during the iron and steel production with the mercury input of 1075. 27 g · d⁻¹ ± 60.89 g · d⁻¹ accounting for 68.06% of the total mercury input during this production process, and the ore powder was considered as the main mercury source. For the solid output material, the output in the sintering process was 14.15 g · d⁻¹ ± 0.38 g · d⁻¹, accounting for 22.61% of the total solid output. The mercury emission amount from this studied iron and steel enterprise was estimated to be 553.83 kg in 2013 with the emission factor of 0.092 g · t⁻¹ steel production. Thus, to control the mercury emissions, iron and steel enterprises should combine with production practice, further reduce energy consumption of coking and sintering, or improve the quality of raw materials and reduce the input of mercury.
authors.forename: Ya-hui
authors.initials: YH
authors.lastname: Zhang
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhang
authors.forename: Ding-yong
authors.initials: DY
authors.lastname: Wang
authors.forename: Cheng-zhong
authors.initials: CZ
authors.lastname: Luo
authors.forename: Xi
authors.initials: X
authors.lastname: Yang
authors.forename: Feng
authors.initials: F
authors.lastname: Xu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D003031:Coal; D003077:Coke; D004391:Dust; D007501:Iron; D008628:Mercury / Q000032:analysis*; D008669:Metallurgy; D013232:Steel
chemical_list: D000393:Air Pollutants; D003031:Coal; D003077:Coke; D004391:Dust; D013232:Steel; D007501:Iron; D008628:Mercury