The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou,China |
| |
| Institution: | 1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China;3. Department of Chemical Engineering, Monash University, Wellington Road, Clayton, Victoria 3800, Australia;1. Chinese Research Academy of Environmental Science, Beijing 100020, China;2. Beijing University of Chemical Technology, Beijing 100029, China;3. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;4. Department of Environmental Science & Technology, North China Electric Power University, Baoding 071003, China;1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China;2. Exploration and Research Institute, Anhui Provincial Bureau of Coal Geology, Hefei 230088, China;3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi’an, Shanxi 710075, China |
| |
| Abstract: | Household coal combustion has caused endemic poisoning in southwest Guizhou Province of China. The mineralogy, geochemistry and mode of occurrence of trace elements (TEs) of coal from this area were examined, and oxidative pyrolysis experiments of the coal were conducted in a box resistance reactor at 300–1200 °C to evaluate the volatilization of trace elements. In coal, As, Sb, Pb, Zn, W, Mo, and Cr are highly enriched when compared to both the world coal and Chinese coal. Cadmium, Sr, and Ba are all slightly higher than the average value for Chinese coal. The volatility of trace elements exhibits a close correlation with the mode of element occurrence. The considerable volatilization of As, Sb, Pb, Zn, Cd and Cr below 450 °C is thought to be related to the organic form of these elements. In the temperature range of 450–1200 °C, the volatility of all trace elements except As increases slowly with temperature because these elements are highly associated with silicates. Among the hazardous trace elements, As is the most volatile, and Sb, Pb, Zn, Cd and Cr are moderately volatile. Arsenic exhibits a uniquely high release at 900–1000 °C, which could be attributed to the high proportion of As association with sulfide. Because TEs are primarily inorganically-associated, the volatilization of TEs is not comparable to the loss of coal weight during pyrolysis. At high temperatures, a significantly low coal weight loss can result in a significant volatility of TEs. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
