Authors: Yingyi Zhang Jinichiro Nakano Lili Liu Xidong Wang Zuotai Zhang
Publish Date: 2015/05/27
Volume: 22, Issue: 20, Pages: 15469-15478
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 ganguefired 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 nonvolatile and were enriched in the bottom ash Pb Co Zn Cu and Ni were semivolatile 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 elementsThis study was sponsored by The Common Development Fund of Beijing and the National Natural Science Foundation of China 51472007 51172003 and 51074009 the National High Technology Research and Development Program of China 863 Program 2012AA06A114 the China National Key Technology RD Program 2013BAC14B07 and the Ministry of land and resources nonprofit industry research specific 20151106202
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