| 利用改性钒钛钢渣和飞灰吸附模拟烟气中的Hg0 |
| |
| 引用本文： | 石应杰,邓双,杨丽,张辰,曹晴,张凡,王红梅.利用改性钒钛钢渣和飞灰吸附模拟烟气中的Hg0[J].环境科学研究,2015,28(12):1895-1901. |
| |
| 作者姓名： | 石应杰 邓双 杨丽 张辰 曹晴 张凡 王红梅 |
| |
| 作者单位： | 1.中国矿业大学北京化学环境工程学院, 北京 100083 ;中国环境科学研究院, 北京 100012 |
| |
| 基金项目： | 国家高技术研究发展计划(863)项目(2013AA065001)；国家环境保护公益性行业科研专项(201509012,8) |
| |
| 摘 要： | 固体废弃物钒钛钢渣(VTS)、飞灰(FA)含有Fe、V、Ti等可促进Hg0氧化吸附的过渡金属氧化物,为提高VTS吸附Hg0性能、改性FA的抗硫特性,利用蒸汽活化、浸渍FeCl3方法改性FA/VTS、FA/CaO,在固定吸附床上研究了不同改性方法、反应温度(T)、烟气ρ(SO2)和ρ(HCl)对η(吸Hg0效率)的影响. 结果表明:蒸汽活化对提高η的作用有限. 经浸渍FeCl3方法改性的FA/VTS,其η显著提高,在200 ℃下,吸附20 min时可达93%,吸附10 h后的Q(吸附容量)为0.42 mg/g；而浸渍FeCl3方法改性的FA/CaO,其η随温度呈先升后降趋势,在120 ℃、吸附20 min时达到最高(74%). SO2抑制Hg0的吸附,但FA/VTS的抗硫性能较FA/CaO有显著提高,具有低温抗硫吸附Hg0的潜势,可能与VTS中Ti的质量分数高有关. HCl可促进Hg0的吸附,在ρ(HCl)为30 mg/m3条件下,浸渍FeCl3方法改性的FA/VTS吸附2 h的η在90%以上. 研究表明,经FeCl3浸渍改性的FA/VTS是较好的Hg0吸附剂,具有实际应用的潜势.
|
| 关 键 词： | 钒钛钢渣 飞灰 元素汞 氧化钙 吸附 |
| 收稿时间： | 2015/5/25 0:00:00 |
| 修稿时间： | 2015/8/27 0:00:00 |
Hg0 Removal from Simulated Flue Gas with Modified VTS and Fly Ash as Adsorbents |
| |
| SHI Yingjie,DENG Shuang,YANG Li,ZHANG Chen,CAO Qing,ZHANG Fan and WANG Hongmei.Hg0 Removal from Simulated Flue Gas with Modified VTS and Fly Ash as Adsorbents[J].Research of Environmental Sciences,2015,28(12):1895-1901. |
| |
| Authors: | SHI Yingjie DENG Shuang YANG Li ZHANG Chen CAO Qing ZHANG Fan and WANG Hongmei |
| |
| Affiliation: | 1.School of Chemical Engineering & Technology, China University of Mining & Technology, Beijing 100083, China ;Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China3.School of Chemical Engineering & Technology, China University of Mining & Technology, Beijing 100083, China |
| |
| Abstract: | As solid wastes, vanadium titanium steel slag (VTS) and fly ash (FA) contain transition metal oxides, such as Fe, V and Ti, which can promote the adsorption of Hg0. To improve the ability of VTS to adsorb Hg0 and modify FA to resist sulfur, the methods of steam activation and FeCl3 impregnation were applied to modify FA/VTS and FA/CaO. A fixed bed was used to analyze the impacts by different modification methods under different conditions, such as reaction temperature, SO2 and HCl concentrations, on Hg0 adsorption. The results showed that the adsorption efficiency of FA/VTS modified by steam activation on Hg0 showed limited improvement. The adsorption efficiency of FA/VTS modified by FeCl3 impregnation improved significantly. When the temperature was lower than 200 ℃, the adsorption efficiency reached 93% after 20 min adsorption. The adsorption capability was 0.42 mg/g after 10 h adsorption. For FA/CaO adsorbent by FeCl3 impregnation, the adsorption efficiency increased first, then decreased, reaching 74% after 20 min adsorption at 120 ℃. SO2 inhibited the adsorption of Hg0. Comparing the two modified adsorbents, the sulfur resistant properties of FA/VTS were improved greater than those of FA/CaO. FA/VTS had a sulfur resistant potential to absorb Hg0 at low temperatures; it might be associated with the high content of Ti in VTS. HCl in flue gas could promote the absorbtion of Hg0. The Hg0 absorbtion efficiency of FA/VTS modified by FeCl3 impregnation was higher than 90% after 2 h adsorption, when 30 mg/m3 HCl was added to the flue. FA/VTS modified by FeCl3 impregnation has the potential in practice to achieve sulfur resistance and Hg0 adsorption at a low temperature. |
| |
| Keywords: | vanadium titanium steel slag fly ash elemental mercury CaO adsorption |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《环境科学研究》浏览原始摘要信息 |
|
点击此处可从《环境科学研究》下载全文 |
|
