赤泥制备脱硫剂及其脱硫机理

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (3): 1001-1010.

赤泥制备脱硫剂及其脱硫机理

张旭明^1,2, 王伟强³, 张风頔³, 邹欣伟³

1.百色学院材料科学与工程学院生态铝产业学院,百色 533000;
2.广西生态铝绿色制造重点实验室,百色 533000;
3.太原科技大学材料科学与工程学院,太原 030024

收稿日期:2024-09-18 修订日期:2024-11-08 出版日期:2025-03-15 发布日期:2025-04-01
通信作者: 邹欣伟,博士,副教授。E-mail:xwzou@tyust.edu.cn
作者简介:张旭明(1978—),男,博士,工程师。主要从事固废综合利用及环境材料方面的研究。E-mail:zhangxuming3000@bsuc.edu.cn
基金资助:
百色市科学研究与技术开发计划项目(20230553);山西省基础研究计划项目(202203021211197)

Preparation of Desulfurizer from Red Mud and Its Desulfurization Mechanism

ZHANG Xuming^1,2, WANG Weiqiang³, ZHANG Fengdi³, ZOU Xinwei³

1. School of Materials Science and Engineering College of Ecological Aluminum Industry, Baise University, Baise 533000, China;
2. Guangxi Key Laboratory of Ecological Aluminum Green Manufacturing, Baise 533000, China;
3. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Received:2024-09-18 Revised:2024-11-08 Published:2025-03-15 Online:2025-04-01

摘要/Abstract

摘要： 为实现利用赤泥去脱除烟气中SO₂的目标,以赤泥和粉煤灰为原料,活性炭为造孔剂,硅酸钠为粘结剂,采用挤压成型然后煅烧制备干法脱硫剂并对其脱硫机理进行探究。研究了造孔剂、粘结剂的添加量和脱硫温度对脱硫剂脱硫性能的影响,最终确定脱硫剂的配合比(质量比)为m(赤泥)∶m(硅酸钠)∶m(粉煤灰)∶m(活性炭)=70∶20∶15∶10,当脱硫温度为250 ℃时,脱硫性能达到最佳,穿透时间为163 min,穿透硫容达10.484%。结果表明,赤泥制备脱硫剂脱除SO₂主要靠表面吸附机制和金属氧化物与SO₂的反应机制。表面吸附主要依赖脱硫剂的孔径分布、比表面积、丰富的孔结构和表面活性中心。金属氧化物能对SO₂起到吸附作用并发生化学反应,金属氧化物含有的大量晶格氧和吸附氧可以催化化学反应进行,提高脱硫效率。

关键词: 赤泥, 脱硫剂, 脱硫机理, 表面吸附机制, 金属氧化物反应机制

Abstract: In order to achieve the goal of using red mud to remove SO₂ from flue gas, red mud and fly ash were used as raw materials, activated carbon as pore-forming agent, and sodium silicate as binder, and the dry desulfurization agent was prepared by extrusion and then calcination, and the desulfurization mechanism was explored. The effects of different pore-forming agent, binder addition and desulfurization temperature on the desulfurization performance of the desulfurizer were studied, the best mass ratio was determined to be m(red mud)∶m(sodium silicate)∶m(fly ash)∶m(activated carbon)=70∶20∶15∶10, and the desulfurization temperature was 250 ℃ to obtain the best desulfurization performance, with a penetration time of 163 min and a penetrating sulfur capacity of 10.484%. The results show that the removal of SO₂ by red mud desulfurizer mainly depends on the surface adsorption mechanism and the reaction mechanism between metal oxide and SO₂. The surface adsorption mainly depends on the pore size distribution, specific surface area, rich pore structure and surface active centers of desulfurizers. The metal oxides can play adsorption role and chemical reaction with SO₂, and the large amount of lattice oxygen and adsorbed oxygen contained in it can catalyze the chemical reaction and improve the efficiency of desulfurization.

Key words: red mud, desulfurizer, desulfurization mechanism, surface adsorption mechanism, metal oxide reaction mechanism

中图分类号:

X701.3

张旭明, 王伟强, 张风頔, 邹欣伟. 赤泥制备脱硫剂及其脱硫机理[J]. 硅酸盐通报, 2025, 44(3): 1001-1010.

ZHANG Xuming, WANG Weiqiang, ZHANG Fengdi, ZOU Xinwei. Preparation of Desulfurizer from Red Mud and Its Desulfurization Mechanism[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1001-1010.

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