化工环保2024，Vol.44Issue(3)：392-397,6.DOI:10.3969/j.issn.1006-1878.2024.03.012
改性飞灰吸附燃煤烟气中的砷
Arsenic adsorption by modified fly ash from coal-fired flue gas
摘要
Abstract
Coal-fired fly ash was studied and modified by heavy fluid separation and acid/alkali ultrasonic treatment.The changes in the composition characteristics,structure,and morphology of the fly ash before and after modification were investigated,and the adsorption effects of different fly ash adsorbents on As2O3(g)were compared.The experimental results show that after heavy fluid separation of the fly ash,the content(w)of active components,namely Fe2O3 and CaO increase from 7.63%and 8.06%to 12.80%and 24.02%,respectively.Then,after HCl/HF/NaOH-ultrasonic modification,the total contents of Fe2O3 and CaO are 36.38%,52.94%,and 44.88%,respectively.At the temperature of 700℃and the adsorption time of 60 min,the adsorption capacity of As by the original fly ash is 466 μg/g.After heavy fluid separation,the adsorption capacity of As is increased to 702 μg/g.After HF-ultrasonic modification,the adsorption capacity of As reaches the maximum value of 1 655 μg/g.The characterization results demonstrate that after HF-ultrasonic modification,the specific surface area and the pore volume of fly ash increase significantly to 15.006 m2/g and 0.047 cm3/g.Especially,mesopores are also observed.关键词
飞灰/燃煤烟气/重选/改性/砷/吸附Key words
fly ash/coal-fired flue gas/gravity concentration/modification/arsenic/adsorption分类
资源环境引用本文复制引用
张浩浩,胡晓炜,梁洋硕,韩军..改性飞灰吸附燃煤烟气中的砷[J].化工环保,2024,44(3):392-397,6.基金项目
湖北省重点研发计划项目(2023AFA004,2023BCB106,2022BEC004,2022BCA085,2021BCA151,2021BCA131). （2023AFA004,2023BCB106,2022BEC004,2022BCA085,2021BCA151,2021BCA131）
