硫酸活化硫酸亚铁絮凝污泥对冶炼烟气中Hg<sup>0</sup>的脱除研究

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摘要以硫酸亚铁絮凝污泥为原料，硫酸为活化剂，制备了一种性能优异的吸附剂（简称SS_XT_Y），可有效捕获冶炼烟气中的Hg⁰.H₂SO₄活化可以改善絮凝污泥吸附剂的孔隙结构，提高吸附剂表面活性氧和活性硫物种的含量，从而增强了吸附剂的脱汞活性.经H₂SO₄活化后，吸附剂的SO₂抗性大幅提高，能有效克服实际工况中SO₂的抑制作用.热解温度和H₂SO₄添加比例对吸附剂脱汞活性存在显著影响.SS₂₅T₆₅₀（H₂SO₄添加比例为0.25，热解温度为650℃）的脱汞性能最为优异，脱汞效率可达95.4%.利用絮凝污泥生产汞吸附剂可以降低吸附剂生产成本，并为絮凝污泥资源化利用提供了一条潜在途径.SS_XT_Y的制备方法简单、成本低、SO₂抗性优异、脱汞性能优异，是一种具有应用前景的汞吸附剂.

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	李鸿鹄
	彭喜燕
	安淼
	李佳艺
	曹艳晓

关键词 ：硫酸活化, 硫酸亚铁絮凝污泥, 冶炼烟气, 元素汞, 机理

Abstract：A kind of adsorbent (SS_XT_Y) with excellent performance on efficiently capturing Hg⁰ in smelting flue gas was prepared from ferrous sulfate-flocculated sludge with sulfuric acid activation. H₂SO₄ activation could improve the adsorbent pore structure and increase the active surface oxygen/sulfur species, thus leading to the enhanced mercury removal activity of the adsorbent. Moreover, the SO₂ resistance of the adsorbent was greatly improved, which could effectively overcome the inhibition effect of SO₂ in actual working conditions. Pyrolysis temperature and H₂SO₄ addition ratio showed significant effects on the mercury removal activity of adsorbent. SS₂₅T₆₅₀(H₂SO₄ addition ratio of 0.25 and pyrolysis temperature of 650℃) exhibited the highest mercury removal efficiency (95.4%). Using flocculated sludge to produce mercury adsorbent not only reduces the adsorbent cost, but also provides a potential way for the resource utilization of flocculated sludge. SS_XT_Y has the advantages of simple preparation method, low cost, excellent SO₂ resistance and prominent mercury removal performance, thus showing promising application prospects.

Key words： sulfuric acid activation ferrous sulfate-flocculated sludge smelting flue gas elemental mercury mechanism

收稿日期: 2023-03-20

PACS:

X511

基金资助:国家自然科学基金资助项目（52100134）；中南财经政法大学中央高校基本科研业务费专项资金资助（2722023BY020）

通讯作者: 李鸿鹄,副教授,lhhsam@outlook.com E-mail: lhhsam@outlook.com

作者简介: 李鸿鹄(1991-),男,湖北京山人,中南财经政法大学副教授,博士,主要研究方向为烟气污染物治理.发表论文30余篇.lhhssm@outlook.com.

引用本文:

李鸿鹄, 彭喜燕, 安淼, 李佳艺, 曹艳晓. 硫酸活化硫酸亚铁絮凝污泥对冶炼烟气中Hg⁰的脱除研究[J]. 中国环境科学, 2023, 43(11): 5709-5718. LI Hong-hu, PENG Xi-yan, AN Miao, LI Jia-yi, CAO Yan-xiao. Removal of Hg⁰ from smelting flue gas by FeSO₄-flocculated sludge activated with sulfuric acid. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5709-5718.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I11/5709

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