Composition and risk assessment of roasted pyrite ash from fertiliser production 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Chemosphere: Environmental toxicology and risk assessment
年/卷/期
2018 / 209 / Oct.
页码
277-285
ISSN号
0045-6535
作者单位
Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Technical University of Cartagena;Internationale Umwelttechnik, Hochschule Bremen;Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Technical University of Cartagena;Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Technical University of Cartagena;Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Technical University of Cartagena;
作者
M. Gabarrón;O. Babur;J.M. Soriano-Disla;A. Faz;J.A. Acosta;
摘要
Pyrite ash is a residue from the roasting of pyrite ores to obtain sulphuric acid used in the fertiliser industry and its production is widely extended worldwide. The mismanagement of this waste may result in environmental and health damages due to its physico-chemical characteristics. The main objective of this study was to examine the physico-chemical and mineralogical composition of roasted pyrite ash from an abandoned fertiliser company, and to evaluate the environmental risk caused by the wind and water dispersion of metals posed by this waste. In order to achieve these objectives, a sequential extraction procedure and a physical fractionation into six size fractions: >100, 100–50, 50–20, 20–10, 10–2.5 and?<?2.5?μm were applied. Results showed that pyrite ash is composed mainly of iron-oxides such as hematite (46%) and secondary minerals as anglesite and shows high concentrations of Pb (7464?mg?kg?1), Zn (2663?mg?kg?1) and Cu (585?mg?kg?1). The highest Risk Assessment Code (RAC) values were found for Cd, Pb and Zn, bound to the more labile fractions. Conversely, Pb showed the lowest water solubility due to the covering effect provided by a coating of anglesite in the pyrite ash surface. Most of the metals were associated to both the coarsest (>100?μm) and the finest (2.5–10?μm) fractions, although none represented an environmental risk according to the ecological risk index results. However, 30% of the metals were bound to the respirable fraction (≤100?μm) posing a potential risk for human health and a high potential dispersion by wind to the surrounding areas.
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关键词/主题词
Metal pollution;Particle size;Pyrite ash;Sequential extraction;Sulphuric acid production;
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