Effect of mechanical force and microwave on the NH3-SCR denitration of rare earth tailings

被引：0
|
作者：
Hou L. [1 ]
Yan X. [2 ]
Qiao C. [2 ]
Fu S. [2 ]
Wu W. [1 ,2 ]
机构：
[1] Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Institute of Industrial Technology Research, Inner Mongolia University of Science & Technology, Baotou
[2] Key Laboratory of Efficient and Clean Combustion, School of Energy and Environment, Inner Mongolia University of Science & Technology, Baotou
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 10期
关键词：
Activation; Catalyst; Mechanical force-microwave; NH[!sub]3[!/sub]-SCR; Rare earth tailings;
D O I：
10.16085/j.issn.1000-6613.2020-2175
中图分类号：
学科分类号：
摘要：
Due to the complex association of minerals in rare earth tailings, some minerals cannot be fully exposed to show their activity. In the paper, rare earth tailings were activated by the combination of mechanical force and microwave. Orthogonal test was used to study the effects of operation parameters of mechanical force and microwave activation on the NH3-SCR denitration performance, with the aid of characterization methods of XRD, SEM-EDS, H2-TPR, NH3-TPD, and BET. The results showed that the significance of the parameters was in the order: ball to powder weight ratio > rotor speed > ball milling time = ball diameter ratio > calcination temperature = calcination time = calcination power. The optimum activation parameters were determined as powder weight ratio was 1:1, rotor speed was 300r/min, ball milling time was 2h, ball diameter ratio was 1:1:1, calcination temperature was 250℃, calcination time was 20min, and calcination power was 1100W, under which the denitration activity of rare earth tailings increased by 40%. The specific surface area, mineral dispersion, amount of surface acid active site and redox performance of rare earth tailings can be improved. The uniform distribution of weak, medium to strong and strong acid active sites is beneficial to the denitration activity. The high degree of hematite exposure is conducive to the denitration of rare earth tailings. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：5818 / 5828
页数：10
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