煤中砷的地球化学研究

Study on the Geochemistry of Arsenic in Coal

燃煤是大气中As的主要来源之一,不同地区、不同成煤期、不同成煤环境煤中As的含量差异较大.中国煤中As的平均含量高于世界煤中As的平均值,而低于美国煤.中国燃煤As污染比较严重.本文系统分析了煤中As的含量、分布特征、赋存形态、迁移转化规律、燃煤As排放的控制技术及其有关研究进展.

Coal is an important resource for arsenic in environment.Many trace elements enriched in coal for its coal-forming geochemical condition is unusual.Arsenic as one main trace element of coal will affect environment when coal being exploited and utilized.This paper systematically discussed the geochemistry of arsenic in coal to analyze the content,the distribution,chemical speciation,the source,and the migration and evolution of arsenic during the exploitation and using process.Arsenic contents of coal from different regions and coal-forming periods are obviously different because the coal rank and coal-forming period and environment are very different.Recent studies indicate that the average value of arsenic content in Chinese coals is higher than that in coals of most countries and less than that in American coals.The pollution of burning coal in China is comparatively severe.CaO can effectively control arsenic discharge in coal combustion under certain temperature.