Occurrence and release of cadmium, chromium, and lead from stone coal combustion
Wei Cui
Qingjun Meng
Qiyan Feng
Lai Zhou
Yahong Cui
Wenbo Li
1.Shaanxi Huacheng Industrial Joint Stock Company, Xi'an, Shaanxi, China2.School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China
摘要：Stone coal,which has high ash yield,low carbon content,and low calorific value,releases toxic elements during the combustion process.In this study,samples were collected from an open-pit stone coal mine in the southern Shaanxi province,China.A simulated combustion experiment and sequential chemical extraction were applied to investigate the enrichment,occurrence,and release of Cr,Cd,and Pb in raw stone coal and ash.The contents of Cr,Cd,and Pb in raw stone coal were larger than those reported for other coals in China and worldwide.The enrichment factors of Cr,Cd,and Pb in ash at different temperatures exceeded 0.7,with the exception of Cd at 1000 ℃.This indicates that Cr,Cd,and Pb were first enriched at low temperature (below 600 ℃) and then volatilized at high temperature due to the decomposition of clay minerals.The dominant forms of toxic elements in raw stone coal were Fe-Mn-bound Cr and Cd and carbonates of Pb.As the temperature increased,the organic forms decreased obviously,and the residual forms increased;however,the Fe-Mn-bound forms remained the dominant forms of Cr,Cd,and Pb.
机标关键词：sequential chemical extractionShaanxi provincehigh temperaturelow temperaturecalorific valuecarbon contentclay mineralscoal mine
资助基金：This research was supported by the National Natural Science Foundation of China (41572218)
论文发表日期：2019-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：9( 586-594 )
英文信息