化工进展 ›› 2020, Vol. 39 ›› Issue (3): 1187-1195.DOI: 10.16085/j.issn.1000-6613.2019-1103

• 资源与环境化工 • 上一篇    下一篇

CuCl2改性磁性凹凸棒土的脱汞性能

丁守一(),黄亚继(),陈浩,董璐,樊聪慧,胡华军,戚二兵   

  1. 东南大学能源热转换及其过程测控教育部重点实验室,江苏 南京 210096
  • 收稿日期:2019-07-11 出版日期:2020-03-05 发布日期:2020-04-03
  • 通讯作者: 黄亚继
  • 作者简介:丁守一(1996—),男,硕士研究生。E-mail:2106705414@qq.com
  • 基金资助:
    国家重点研发计划(2018YFC1901200);国家自然科学基金(51676040);江苏省自然科学基金(BK20181281)

Mercury removal performance of CuCl2-modified magnetic attapulgite

Shouyi DING(),Yaji HUANG(),Hao CHEN,Lu DONG,Conghui FAN,Huajun HU,Erbing QI   

  1. Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2019-07-11 Online:2020-03-05 Published:2020-04-03
  • Contact: Yaji HUANG

摘要:

通过在凹凸棒土(Atp)表面负载铁氧化物进行磁改性而生成的磁性凹凸棒土(MAtp),相对于一般脱汞吸附剂而言,更易分离回收,具有实际应用的前景,但脱汞效率较低。本文选取磁质量分数为50%的MAtp,采用浸渍法对其进行CuCl2改性,在利用固定床实验系统上探究了CuCl2负载量、反应温度和烟气组分(O2、SO2、NO、HCl)对其脱汞性能的影响,结合多种表征结果分析其脱汞机理。结果表明:CuCl2负载量的最佳值为5%;一定范围内反应温度与脱汞效率呈正相关,超过250℃时吸附剂的孔隙结构会遭到破坏,发生脱附现象;O2和HCl对吸附剂脱汞性能有明显提升,NO影响较小,SO2会与Hg0竞争吸附,抑制效果显著;CuCl2改性后的MAtp脱汞性能优良,同时延续了较好的磁分离特性,为选择高效实用的脱汞吸附剂提供了研究方向。

关键词: 凹凸棒土, 氯化铜, 脱汞, 改性, 磁性

Abstract:

Compared with the general mercury removal adsorbent, magnetic attapulgite (MAtp) modified by magnetic iron oxide is easier to separate and recover and has potential for practical application, but the efficiency is to be improved. In this paper, MAtp with magnetic content of 50% was selected and modified by impregnation method. The fixed bed experimental system was used to investigate the effect of CuCl2 content, reaction temperature and flue gas components (O2, SO2, NO, HCl). Meanwhile, combined with a variety of characterization results, the adsorbent’s mercury removal mechanism was analyzed. The result showed that the optimum CuCl2 content was 5%. The reaction temperature in a certain range was positively correlated with the mercury removal efficiency. When the temperature exceeded 250℃, the pore structure of the adsorbent was destroyed and desorption occured. O2 and HCl promoted the adsorption of Hg0 obviously, while the influence of NO was small. SO2 could compete with Hg0 for adsorption, and the inhibition effect was remarkable. The mercury removal of CuCl2-modified MAtp was excellent, and the magnetic separation characteristics were continued, providing research directions in finding highly efficient and practical mercury removal sorbents.

Key words: attapulgite, cupric chloride(CuCl2), mercury removal, modification, magnetism

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