吸附剂烟气脱砷的研究现状

Review on Sorbents for Arsenic Removal from Flue Gas

大气砷污染问题日益引起人们的重视,吸附剂能够在去除烟气中砷的同时去除其他有害气体,是控制烟气砷含量、防止砷污染的有效途径。文章分析了砷在废气中的形态及分布,总结了近年来氧化钙、活性炭、飞灰和金属氧化物作为吸附剂用于烟气脱砷的最新研究进展,重点分析了各自的吸附机理及不同因素对脱砷过程的影响。指出吸附过程通常以化学吸附为主,吸附能力主要由吸附剂化学成分决定。此外,温度、吸附剂表面结构特性及杂质气体等因素也会对吸附过程造成影响。建议应加强不同吸附剂砷吸附机理研究,固体吸附剂及吸附条件的选择应综合考虑功能、效率及成本等因素,同时着眼于传统吸附剂的改性研究。

Atmosphere arsenic contamination has drawn increasingly attentions.Removal of arsenic and other harmful gas in flue gas by sorbents is becoming an attractive means to control arsenic content in flue gas and prevent arsenic contamination.Morphology and distribution of arsenic in flue gas were analyzed.New research progress of calcium oxide,activated carbon,fly ash and metal oxide as sorbents for arsenic removal from flue gas was summarized,with emphasis on analysis of arsenic capture mechanism and influence factors of arsenic removal process.It showed that chemistry adsorption is main adsorption reaction,and capture ability mainly depends on chemical composition of sorbents.Besides,temperature,sorbents＇ surface texture and other impurity gas also affect the adsorption process.The study on arsenic capture mechanism of different sorbents should be enhanced.Factors such as function,efficiency and cost should be considered,and modified study of the traditional sorbents should be emphasized as well.