Denitrification performance of rare earth tailings-based catalysts
Rare earth tailings from the Bayan Obo mine are rich in rare earth, iron, and other catalytically active substances. In this study, Na2CO3 and Ca(OH)2 were mixed with rare earth tailings, roasted, and the tailings modified by HCl-citric acid leaching and pickling to prepare high-performance rare ear...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2019-01-01
|
| Series: | Green Processing and Synthesis |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/gps-2019-0057 |
| _version_ | 1819290804353499136 |
|---|---|
| author | Wang Zhenfeng Huang Yanan Luo Huijuan Gong Zhijun Zhang Kai Li Na Wu Wenfei |
| author_facet | Wang Zhenfeng Huang Yanan Luo Huijuan Gong Zhijun Zhang Kai Li Na Wu Wenfei |
| author_sort | Wang Zhenfeng |
| collection | DOAJ |
| description | Rare earth tailings from the Bayan Obo mine are rich in rare earth, iron, and other catalytically active substances. In this study, Na2CO3 and Ca(OH)2 were mixed with rare earth tailings, roasted, and the tailings modified by HCl-citric acid leaching and pickling to prepare high-performance rare earth tailings-based denitrification catalysts. Denitrification performance tests show that, in the temperature range 700°C~900°C, the alkali and acid co-processed modified tailings sample gave the best catalytic denitrification performance. XRD, SEM, and H2-TPR analyses show that, compared with raw ore samples, Fe activity sites increased after alkali and acid co-treatment. Cracks and holes appeared on the surface of the sample, and the reduction temperature range was broadened. XPS analysis showed that Fe coexisted in the forms Fe2+ and Fe3+, and Ce in the forms Ce3+ and Ce4+. At a rare earth tailings microwave roasting temperature of 500°C, NO concentration of 500 ppm, CO/NO ratio 4:1, and reaction temperature of 900°C, the denitrification efficiency of the catalyst was optimal, at up to 96.2%. In this study, a relatively green and pollution-free method was used to prepare catalysts, which can provide reference for solving the problem of rare earth tailings accumulation. |
| first_indexed | 2024-12-24T03:28:34Z |
| format | Article |
| id | doaj.art-70b74846416c4f3483ad6572e617362e |
| institution | Directory Open Access Journal |
| issn | 2191-9550 |
| language | English |
| last_indexed | 2024-12-24T03:28:34Z |
| publishDate | 2019-01-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Green Processing and Synthesis |
| spelling | doaj.art-70b74846416c4f3483ad6572e617362e2022-12-21T17:17:17ZengDe GruyterGreen Processing and Synthesis2191-95502019-01-018186587210.1515/gps-2019-0057gps-2019-0057Denitrification performance of rare earth tailings-based catalystsWang Zhenfeng0Huang Yanan1Luo Huijuan2Gong Zhijun3Zhang Kai4Li Na5Wu Wenfei6State Key Laboratory of Multi-metal Resources Comprehensive Utilization, Baiyun Obo Mine, Inner Mongolia Autonomous Region, Baotou, Inner Mongolia 014010ChinaSchool of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaSchool of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaSchool of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaSchool of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaSchool of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaSchool of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaRare earth tailings from the Bayan Obo mine are rich in rare earth, iron, and other catalytically active substances. In this study, Na2CO3 and Ca(OH)2 were mixed with rare earth tailings, roasted, and the tailings modified by HCl-citric acid leaching and pickling to prepare high-performance rare earth tailings-based denitrification catalysts. Denitrification performance tests show that, in the temperature range 700°C~900°C, the alkali and acid co-processed modified tailings sample gave the best catalytic denitrification performance. XRD, SEM, and H2-TPR analyses show that, compared with raw ore samples, Fe activity sites increased after alkali and acid co-treatment. Cracks and holes appeared on the surface of the sample, and the reduction temperature range was broadened. XPS analysis showed that Fe coexisted in the forms Fe2+ and Fe3+, and Ce in the forms Ce3+ and Ce4+. At a rare earth tailings microwave roasting temperature of 500°C, NO concentration of 500 ppm, CO/NO ratio 4:1, and reaction temperature of 900°C, the denitrification efficiency of the catalyst was optimal, at up to 96.2%. In this study, a relatively green and pollution-free method was used to prepare catalysts, which can provide reference for solving the problem of rare earth tailings accumulation.https://doi.org/10.1515/gps-2019-0057rare earth tailingsmineral modificationcatalytic denitrification |
| spellingShingle | Wang Zhenfeng Huang Yanan Luo Huijuan Gong Zhijun Zhang Kai Li Na Wu Wenfei Denitrification performance of rare earth tailings-based catalysts Green Processing and Synthesis rare earth tailings mineral modification catalytic denitrification |
| title | Denitrification performance of rare earth tailings-based catalysts |
| title_full | Denitrification performance of rare earth tailings-based catalysts |
| title_fullStr | Denitrification performance of rare earth tailings-based catalysts |
| title_full_unstemmed | Denitrification performance of rare earth tailings-based catalysts |
| title_short | Denitrification performance of rare earth tailings-based catalysts |
| title_sort | denitrification performance of rare earth tailings based catalysts |
| topic | rare earth tailings mineral modification catalytic denitrification |
| url | https://doi.org/10.1515/gps-2019-0057 |
| work_keys_str_mv | AT wangzhenfeng denitrificationperformanceofrareearthtailingsbasedcatalysts AT huangyanan denitrificationperformanceofrareearthtailingsbasedcatalysts AT luohuijuan denitrificationperformanceofrareearthtailingsbasedcatalysts AT gongzhijun denitrificationperformanceofrareearthtailingsbasedcatalysts AT zhangkai denitrificationperformanceofrareearthtailingsbasedcatalysts AT lina denitrificationperformanceofrareearthtailingsbasedcatalysts AT wuwenfei denitrificationperformanceofrareearthtailingsbasedcatalysts |