title: Trace element partitioning behavior of coal gangue-fired CFB plant: experimental and equilibrium calculation.
abstract: Energy recovery is a promising method for coal gangue utilization, during which the prevention of secondary pollution, especially toxic metal emission, is a significant issue in the development of coal gangue utilization. In the present study, investigation into trace element partitioning behavior from a coal gangue-fired power plant in Shanxi province, China, has been conducted. Besides the experimental analysis, thermodynamic equilibrium calculation was also conducted to help the further understanding on the effect of different parameters. Results showed that Hg, As, Be, and Cd were highly volatile elements in the combustion of coal gangue, which were notably enriched in fly ash and may be emitted into the environment via the gas phase. Cr and Mn were mostly non-volatile and were enriched in the bottom ash. Pb, Co, Zn, Cu, and Ni were semi-volatile elements and were enriched in the fly ash to varying degrees. Equilibrium calculations show that the air/fuel ratio and the presence of Cl highly affect the element volatility. The presence of mineral phases, such as aluminosilicates, depresses the volatility of elements by chemical immobilization and competition in Cl. The coal gangue, fly ash, and bottom ash all passed the toxicity characteristic leaching procedure (TCLP), and their alkalinity buffers the acidity of the solution and contributes to the low solubility of the trace elements.
authors.affiliation: Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, 100871, People's Republic of China.
authors.forename: Yingyi
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: URS Corp., PO BOX 1959, Albany, OR, 97321, USA.
authors.forename: Jinichiro
authors.initials: J
authors.lastname: Nakano
authors.affiliation: Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, 100871, People's Republic of China.
authors.forename: Lili
authors.initials: L
authors.lastname: Liu
authors.affiliation: Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, 100871, People's Republic of China.
authors.forename: Xidong
authors.initials: X
authors.lastname: Wang
authors.affiliation: Beijing Key Laboratory for Solid Waste Utilization and Management and Department of Energy and Resource Engineering, College of Engineering, Peking University, Beijing, 100871, People's Republic of China. zuotaizhang@pku.edu.cn.
authors.forename: Zuotai
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002681:China; D003031:Coal / Q000032:analysis*; D060729:Coal Ash / Q000032:analysis*; D017745:Incineration; D052638:Particulate Matter / Q000032:analysis; D011210:Power Plants; D013816:Thermodynamics; D014131:Trace Elements / Q000032:analysis
chemical_list: D000393:Air Pollutants; D003031:Coal; D060729:Coal Ash; D052638:Particulate Matter; D014131:Trace Elements
keywords: CFB plant; Coal gangue; Equilibrium calculation; Trace element