Mn活化铁盐絮凝污泥制备磁性吸附剂脱除烟气中Hg<sup>0</sup>

汪远; 郭华军; 邵雁; 刘子豪; 向浩; 胡国峰; 李鸿鹄; 胡将军

doi:10.13205/j.hjgc.202303010

Mn活化铁盐絮凝污泥制备磁性吸附剂脱除烟气中Hg⁰

doi: 10.13205/j.hjgc.202303010

1. 中冶南方都市环保工程技术股份有限公司, 武汉 430200;
2. 中南财经政法大学信息与安全工程学院, 武汉 430073;
3. 武汉大学资源与环境科学学院, 武汉 430079

基金项目:

国家自然科学基金青年基金(52100134)

详细信息

作者简介:
汪远(1990-),男,博士,主要研究方向为大气污染控制。Wangyuanwhuu163.com

通讯作者:
李鸿鹄(1991-),男,博士,副教授,主要研究方向为大气污染控制。448657141@qq.com

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出版历程
- 收稿日期: 2022-04-21
- 网络出版日期: 2023-05-26
- 刊出日期: 2023-03-01

REMOVAL OF ELEMENTAL MERCURY USING MAGNETIC ADSORBENT PREPARED FROM SLUDGE FLOCCULATED WITH FERROUS SULFATE BY Mn ACTIVATION

1. WISDRI City Environment Protection Engineering Co., Ltd, Wuhan 430200, China;
2. School of Information and Safety Engineering, Zhongnan University of Economics and Law, Wuhan 430073, China;
3. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China

摘要

摘要: 采用Mn(NO₃)₂活化铁盐絮凝污泥制备磁性吸附剂用于烟气中Hg⁰的脱除。结果表明:1)Mn(NO₃)₂热分解产生的O₂促进了污泥一次热解过程中产生的FeC_<em>x分解,并有利于Mn⁴⁺与Fe³⁺等高价态金属氧化物的生成;Mn(NO₃)₂分解产生的气体有扩孔作用,在其掺杂量为10%时,吸附剂比表面积达到最大(88.5 m²/g),但Mn(NO₃)₂的掺杂量过高时会产生较多的晶相物质,并导致吸附剂的比表面积降低。2)当Mn掺杂量为10%(记为Mn₁₀-SFS),反应温度为150℃时,吸附剂脱汞效率最高(92.7%)。3)烟气中的O₂可对吸附剂中的活性氧进行有效补充,促进Hg⁰的脱除;NO以及低浓度的SO₂对Hg⁰脱除有一定的促进作用,而H₂O与高浓度的SO₂则由于竞争吸附对Hg⁰脱除抑制作用明显。吸附再生试验表明:Mn₁₀-SFS吸附剂具有良好的可再生循环利用性能及稳定性,5次Hg⁰的吸附脱附循环试验后,其脱汞性能无明显降低。
- 污泥 /
- 吸附剂 /
- 燃煤烟气 /
- 汞的脱除REMOVAL
Abstract: In this work, ferrous sulfate-flocculated sewage sludge (SFS) was activated by Mn(NO₃)₂ and then pyrolyzed to obtain magnetic adsorbent, which was adopted to remove elemental mercury (Hg⁰) from flue gas. Results showed that 1) O₂ produced by the thermal decomposition of Mn(NO₃)₂ promoted the decomposition of FeC_<em>x during primary pyrolysis of sludge, and that was conducive to the formation of high-valent metal oxides such as Mn⁴⁺and Fe³⁺. The gas produced by the decomposition of Mn(NO₃)₂ also showed the effect of pore expansion. With the addition of 10% Mn(NO₃)₂, the specific surface area of the adsorbent reached the maximum (88.5 m²/g), but when the Mn(NO₃)₂ amount continued to rise, it would produce many crystalline substances and then decreased the specific surface area of the adsorbent. 2) Mn₁₀-SFS showed a maximum mercury removal efficiency of 92.7% at the reaction temperature of 150 ℃. 3) O₂ could effectively supplement the active oxygen in the adsorbent, promoting the removal of Hg⁰, and presence of NO and a low SO₂ concentration enhanced Hg⁰ removal, while H₂O vapor and a high concentration of SO₂ inhibited it. The Hg⁰ adsorption and desorption experiment showed that the adsorbent of Mn₁₀-SFS exhibited good renewable recycling performance and stability. After Hg⁰ capture and regeneration for 5 cycles, the removal efficiency of the adsorbent was not notably degraded.
- sludge /
- adsorbent /
- coal-fired flue gas /
- mercury removal

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