Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (4): 2190-2200.DOI: 10.16085/j.issn.1000-6613.2022-1188

• Resources and environmental engineering • Previous Articles    

Effect of O2/H2O/SO2 on the adsorption of PbCl2 by modified iron-rich attapulgite at high temperature

ZHAO Chongyang1(), ZHAO Lei2, SHI Xiangwen1, HUANG Jun1, LI Zhiyao2, SHEN Kai2, ZHANG Yaping2()   

  1. 1.National Energy Group Jianbi Power Plant, Zhenjiang 212006, Jiangsu, China
    2.Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2022-06-27 Revised:2022-09-09 Online:2023-05-08 Published:2023-04-25
  • Contact: ZHANG Yaping

O2/H2O/SO2 对改性富铁凹凸棒石高温吸附PbCl2 的影响

赵重阳1(), 赵磊2, 石详文1, 黄俊1, 李治尧2, 沈凯2, 张亚平2()   

  1. 1.国家能源集团谏壁发电厂,江苏 镇江 212006
    2.东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,江苏 南京 210096
  • 通讯作者: 张亚平
  • 作者简介:赵重阳(1972—),男,高级工程师,研究方向为电力环保。E-mail:15952886853@163.com
  • 基金资助:
    国家重点研发计划(2020YFC1908704)

Abstract:

Modified iron-rich attapulgite was obtained by hydrochloric acid activation and Fe3O4 composite modification. The effect of O2/H2O/SO2 on the adsorption of typical semi-volatile heavy metal PbCl2 vapor was investigated in a high-temperature furnace. Meanwhile, the distribution and morphology of lead species in the adsorption products were analyzed. FTIR, BET, XRD and XPS were used to investigate the adsorption mechanism. The results showed that acid activation increased the proportion of surface-active sites by decomposing the impurities in raw ore. The dual active adsorption sites formed from the composite modification by iron-based oxides and attapulgite surface lattice oxygen significantly increased the adsorption capacity of PbCl2. When the flue gas contained 20% O2, 5% H2O and 400mL/m3 SO2, the PbCl2 adsorption capacity of the modified attapulgite was significantly higher than that of the original attapulgite. The highest adsorption capacities of 70.42mg/g, 76.63mg/g and 86.21mg/g were achieved in Fe/HFP2 sample with a loading mass ratio of 1∶2, respectively, better than kaolinite. Furthermore, the content of stable distributed Pb in the adsorption products using modified attapulgite under these atmospheres was higher than that of kaolinite, indicating the adsorption products were more stable.

Key words: lead chloride, adsorption, adsorbents, modification, iron-rich attapulgite, high temperature

摘要:

通过盐酸活化和负载Fe3O4复合改性方式获得改性富铁凹凸棒石,探究O2/H2O/SO2对其吸附高温炉内典型半挥发性重金属PbCl2蒸气的影响,同时分析了吸附产物中铅物种的分布形态,并结合FTIR、BET、XRD和XPS等表征手段深入探究其对PbCl2蒸气的吸附机制。结果表明,酸活化通过分解原矿中杂质提高表面活性位点占比,复合改性后铁基氧化物与凹凸棒石表面晶格氧形成的双活性吸附位点显著增加其PbCl2吸附容量。当高温烟气中含有体积分数20%O2、5%H2O和400mL/m3 SO2时,复合改性凹凸棒石的PbCl2吸附容量较原凹凸棒石有显著提升,在负载质量比为1∶2的Fe/HFP2样品中吸附容量最高可分别达到70.42mg/g、76.63mg/g和86.21mg/g,吸附效果优于高岭土。此外,在这些氛围下改性凹凸棒石吸附产物中铅的稳定分布形态含量高于高岭土,吸附产物更为稳定。

关键词: 氯化铅, 吸附, 吸附剂, 改性, 富铁凹凸棒石, 高温

CLC Number: 

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