磁性凹凸棒土制备及其脱汞性能研究
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摘要
对自然界中广泛存在的凹凸棒土(Atp)进行磁改性,通过沉积-沉淀法制备出磁性氧化铁改性的磁性凹凸棒土(MAtp),采用BET、VSM、XRD以及SEM等手段对其理化性质加以分析,并在固定床实验台上进行模拟烟气脱汞性能测试,研究了铁氧化物含量、反应温度和烟气成分对其除汞能力的影响。结果表明,Atp与磁性物质的复合提高了其对Hg~0的脱除能力,并且随铁氧化物含量升高,MAtp脱汞能力逐渐增强;在实验温度区间内,脱汞能力随温度的升高逐渐增强,MAtp对Hg~0以化学吸附为主;O_2、NO的添加有利于Hg~0的脱除,但Hg~0穿透率随浓度变化不显著;SO_2抑制汞的脱除,并且随浓度的增加,其抑制效果更加明显,但是当NO和SO_2共同存在时,NO能明显削弱SO_2对脱汞的抑制作用。
The attapulgite(Atp)widely existed in nature could be modified by magnetism,and a magnetic attapulgite(MAtp)modified by magnetic iron oxide was prepared by deposition-precipitation method.The physical and chemical properties of the magnetic attapulgite were analyzed by BET,VSM,XRD and SEM,and the effects of iron oxide content,reaction temperature and flue gas composition on the mercury removal capacity were studied.The results showthat the removal ability for Hg~0 is enhanced by the combination of Atp and magnetic materials,and the removal ability of MAtp is gradually improved with the increase in iron oxide content.Moreover,the removal ability of Hg~0 is enhanced with the increase of temperature in the test temperature range,and the chemical adsorption of Hg~0 is a main factor for MAtp.T he addition of O_2 and NO is beneficial to the rem oval of Hg~0,but the Hg~0 penetration rate does not change significantly with the concentration;while SO_2 inhibits the rem oval of m ercury,and the inhibition effect is m ore obvious with the increase of concentration.However,when NO and SO_2 coexist,NO can greatly weaken the inhibition effect of SO_2 on m ercury rem o val.
The attapulgite(Atp)widely existed in nature could be modified by magnetism,and a magnetic attapulgite(MAtp)modified by magnetic iron oxide was prepared by deposition-precipitation method.The physical and chemical properties of the magnetic attapulgite were analyzed by BET,VSM,XRD and SEM,and the effects of iron oxide content,reaction temperature and flue gas composition on the mercury removal capacity were studied.The results showthat the removal ability for Hg~0 is enhanced by the combination of Atp and magnetic materials,and the removal ability of MAtp is gradually improved with the increase in iron oxide content.Moreover,the removal ability of Hg~0 is enhanced with the increase of temperature in the test temperature range,and the chemical adsorption of Hg~0 is a main factor for MAtp.T he addition of O_2 and NO is beneficial to the rem oval of Hg~0,but the Hg~0 penetration rate does not change significantly with the concentration;while SO_2 inhibits the rem oval of m ercury,and the inhibition effect is m ore obvious with the increase of concentration.However,when NO and SO_2 coexist,NO can greatly weaken the inhibition effect of SO_2 on m ercury rem o val.
引文
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[18]DUNHAM G E,DEWALL R A,SENIOR C L. Fixed-bed studies of the interactions between mercury and coal combustion fly ash[J]. Fuel Process Technol,2003,82(2/3):197-213.
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[20]YANG S,GUO Y,YAN N,WU D,HE H,QU Z,JIA J. Elemental mercury capture from flue gas by magnetic Mn-Fe spinel:Effect of chemical heterogeneity[J]. Ind Eng Chem Res,2011,50(16):9650-9656.
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[22]LIAO Y,XIONG S,DANG H,XIAO X,YANG S. The centralized control of elemental mercury emission from the flue gas by a magnetic rengenerable Fe-Ti-M n spinel[J]. J Hazard M ater,2015,299:740-746.
[23]孙青柯,黄亚继,王靓,关正文,李睦,周军,王烨.磁性Fe3O4-Ag复合纳米颗粒吸附剂脱汞性能实验研究[J].化工进展,2017,36(3):1101-1106.(SUN Qing-ke,HUANG Ya-ji,WANG Liang,GUAN Zheng-wen,LI Mu,ZHOU Jun,WANG Ye. Experimental study on mercury removal efficiencies of magnetic Fe304-Ag composite nanoparticles[J]. Chem Ind Eng Prog,2017,36(3):1101-1106.)
[24]DONG L,XIE J,FAN G,HUANG Y,ZHOU J,SUN Q,WANG L,GUAN Z,JIANG D,WANG Y. Experimental and theoretical analysis of element mercury adsorption on Fe3O4/Ag composites[J]. Korean J Chem Eng,2017,34(11):2861-2869.
[25]张安超,支光辉,张志会,孙路石,刘志超,向军.煅烧温度对MnOx-CoOy/TiO2吸附剂结构及脱汞活性的影响[J].中国电机工程学报,2015,35(15):3865-3871.(ZHANG An-chao,ZHI Guang-hui,ZHANG Zhi-hui,SUN Lu-shi,LIU Zhi-chao,XIANG Jun. Influence of calcination temperature on the structure and activity of M n Ox-CoOy/TiO2adsorbent for Hg0removal[J]. Proc CSEE,2015,35(15):3865-3871.)
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