CuCl2改性磁性凹凸棒土的脱汞性能

doi:10.16085/j.issn.1000-6613.2019-1103

摘要/Abstract

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

中图分类号:

X511

丁守一,黄亚继,陈浩,董璐,樊聪慧,胡华军,戚二兵. CuCl₂改性磁性凹凸棒土的脱汞性能[J]. 化工进展, 2020, 39(3): 1187-1195.

Shouyi DING,Yaji HUANG,Hao CHEN,Lu DONG,Conghui FAN,Huajun HU,Erbing QI. Mercury removal performance of CuCl₂-modified magnetic attapulgite[J]. Chemical Industry and Engineering Progress, 2020, 39(3): 1187-1195.

图/表 11

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反应温度/℃	吸附剂	模拟烟气	烟气组分
150	5%CuMAtp	基本烟气	N₂+CO₂(12%)+O₂(5%)
150	5%CuMAtp	1	N₂+CO₂(12%)
150	5%CuMAtp	2	N₂+CO₂(12%)+O₂(5%)+NO(300×10^-6)
150	5%CuMAtp	3	N₂+CO₂(12%)+O₂(5%)+SO₂(0.1%)
150	5%CuMAtp	4	N₂+CO₂(12%)+SO₂(0.1%)
150	5%CuMAtp	5	N₂+CO₂(12%)+O₂(5%)+HCl(10×10^-6)

反应温度/℃	吸附剂	模拟烟气	烟气组分
150	5%CuMAtp	基本烟气	N₂+CO₂(12%)+O₂(5%)
150	5%CuMAtp	1	N₂+CO₂(12%)
150	5%CuMAtp	2	N₂+CO₂(12%)+O₂(5%)+NO(300×10^-6)
150	5%CuMAtp	3	N₂+CO₂(12%)+O₂(5%)+SO₂(0.1%)
150	5%CuMAtp	4	N₂+CO₂(12%)+SO₂(0.1%)
150	5%CuMAtp	5	N₂+CO₂(12%)+O₂(5%)+HCl(10×10^-6)

样品	比表面积A_BET/m²·g^-1	孔容v/cm³·g^-1	平均孔径d/nm
MAtp	136.39	0.454	13.22
1%CuMAtp	134.52	0.461	13.72
5%CuMAtp	123.54	0.466	15.10
10%CuMAtp 15%CuMAtp	104.62 89.55	0.438 0.402	16.73 17.96

样品	比表面积A_BET/m²·g^-1	孔容v/cm³·g^-1	平均孔径d/nm
MAtp	136.39	0.454	13.22
1%CuMAtp	134.52	0.461	13.72
5%CuMAtp	123.54	0.466	15.10
10%CuMAtp 15%CuMAtp	104.62 89.55	0.438 0.402	16.73 17.96

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CuCl₂改性磁性凹凸棒土的脱汞性能

Mercury removal performance of CuCl₂-modified magnetic attapulgite

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