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The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou, China
Xiaofei Wei; Guoping Zhang; Yongbing Cai; Ling Li; Haixia Li
2012
Source PublicationJournal of Analytical and Applied Pyrolysis
Volume98Issue:1Pages:184-193
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 degrees 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 degrees C is thought to be related to the organic form of these elements. In the temperature range of 450-1200 degrees 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 degrees 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.

KeywordCoal Pyrolysis Trace Elements Arsenic Volatilization
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/5135
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Xiaofei Wei,Guoping Zhang,Yongbing Cai,et al. The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou, China[J]. Journal of Analytical and Applied Pyrolysis,2012,98(1):184-193.
APA Xiaofei Wei,Guoping Zhang,Yongbing Cai,Ling Li,&Haixia Li.(2012).The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou, China.Journal of Analytical and Applied Pyrolysis,98(1),184-193.
MLA Xiaofei Wei,et al."The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou, China".Journal of Analytical and Applied Pyrolysis 98.1(2012):184-193.
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