Field Sampling for Establishing the Fingerprints of Fugitive Dusts Emitted from Raw Material Piles in Steel Plants

• Main Authors: Han-Chieh Jen, 任漢傑
• Other Authors: Chang-Gai Lee
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/99153622732990208425

碩士 === 大仁科技大學 === 環境管理研究所 === 96 === ABSTRACT This study adopted the Modified Box Model (MBM) in coordination with removable vertical sampling devices (including filter samplers), which conducted the sampling and analysis of fugitive dusts emitted from raw material piles in steel plants. Major raw materials including coal, limestone and iron ores for steel production were selected and analyzed for the physicochemical characteristics of fugitive dusts (including water-soluble ions, metals, carbons and silt). The fingerprint database of fugitive dusts emitted from raw material piles in steel plants was then established, which can be used as an important reference for the judgment upon pollution disputes. For coal piles, results from this study suggested that the dust concentration emitted from wind erosion ranged from 15 to 1,135 μg/m3; the dust concentration emitted from material acquisition ranged from 24 to 1,500 μg/m3 and the dust concentration emitted from material release ranged from 52 to 891 μg/m3. For limestone piles, the dust concentration emitted from wind erosion ranged from 43 to 1,190 μg/m3; the dust concentration emitted from material acquisition ranged from 24 to 1,220 μg/m3 and the dust concentration emitted from material release ranged from 31 to 1,035 μg/m3. For iron ore piles, the dust concentration emitted from wind erosion ranged from 75 to 1,196 μg/m3; the dust concentration emitted from material acquisition ranged from 71 to 1,000 μg/m3 and the dust concentration emitted from material release ranged from 80 to 1,447 μg/m3. Results from the physical characteristics of raw materials indicated that silt and water content of coal under wind erosion was generally higher than iron and limestone. Similarly, coal has the highest silt and water content for material acquisition. For material release before and after water spray control, limestone had the highest silt content, while coal had the lowest water content before water spray control. Among the raw materials, iron ore had higher silt content than coal. Results from the chemical composition of raw materials indicated that coal had the highest concentration of NO3－ for anions and the highest concentration of Na＋ for cations. Limestone had the highest concentration of NO3－ for anions and the highest concentration of Ca2＋ for cations. Iron ore had similar tends as coal for anions and highest concentration of Na＋ for cations. Results from metallic content indicated that coal and iron ore had the highest Fe and limestone has the highest K. Regardless of raw materials, carbon content contained the highest concentration of organic carbon (OC), accounting for 58.75％ of total carbon (TC). Key words: Fugitive Dusts, Modified Box Model, Raw Material Piles, Fingerprints