大气铊污染现状及治理技术研究进展
Status of atmospheric thallium pollution and research progress of treatment technology
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摘要: 铊及其化合物是一类毒性强,传播广泛的大气污染物.铊的气态污染主要来源是矿物冶炼、火力发电、水泥等行业.铊及其化合物毒性高而排放量较低,已经在国内外富铊地区引起中毒事件.目前,由于冶炼,火电等行业在国内的飞速发展,其排放造成的大气铊污染又给人群健康和生态安全造成了严重的威胁.铊进入大气后,能够伴随大气活动,食物链和沉降等与人体接触.现有的尾气治理措施如除尘和酸洗对废气中的铊具有一定程度的去除效果但不能彻底解决废气中的铊污染问题.通过对铊不同价态化合物的物理化学特征分析,将高毒性,易迁移的一价化合物转化为难迁移,低毒性的三价铊氧化物的新思路是可行的.Abstract: Thallium and its compounds are widespread air pollutants with extremely toxicity. The primary sources of gaseous pollution of thallium are mineral smelting, thermal power generation and cement. Thallium and its compounds have high toxicity and low emission, which have caused poisoning events in thallium affluent areas. Due to the rapid development of smelting, thermal power, and other industries in China, the atmospheric thallium pollution caused by its emissions poses a severe threat to people's health and ecological security. When thallium enters the atmosphere, it can contact the human body with atmospheric activities, food chains, and sedimentation. The existing tail gas treatment such as dust removal and acid washing can remove thallium in flue gas to a certain extent, but it can not completely solve the problem of thallium pollution in flue gas. It is feasible to transform the highly toxic and quickly migrating univalent compounds into the trivalent thallium oxides with low toxicity by analyzing the physicochemical characteristics of different valence state compounds of thallium.
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