A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms
The decrease in the total iron grade of pellets due to bentonite has prompted the search for a non-polluting and alternative binder. While organic binders are considered potential substitutes for bentonite, they cannot fully replace it due to complete decomposition and failure during pellet hardenin...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-11-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423029071 |
| _version_ | 1797301474349285376 |
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| author | Yonghe Ma Qian Li Yan Zhang Yongbin Yang Yinhua Tang Tao Jiang |
| author_facet | Yonghe Ma Qian Li Yan Zhang Yongbin Yang Yinhua Tang Tao Jiang |
| author_sort | Yonghe Ma |
| collection | DOAJ |
| description | The decrease in the total iron grade of pellets due to bentonite has prompted the search for a non-polluting and alternative binder. While organic binders are considered potential substitutes for bentonite, they cannot fully replace it due to complete decomposition and failure during pellet hardening. Thus, the production of pellets utilizing a composite of organic binder and bentonite has gained significant attention in academia and industry. In this study, a novel polymer-type binder (PTB) was introduced to minimize bentonite consumption during green pellet preparation. By regulating the ratio, the addition of just 0.01% PTB can reduce bentonite usage by 1.0% under optimal conditions, all while maintaining excellent pellet quality. Further investigations revealed that PTB molecules adsorbed on the surfaces of iron concentrate (predominantly magnetite) and bentonite through hydrogen bonding, electrostatic repulsion, coordination, monodentate chelation and surface complexation, and dissolved into a fibrous structure to bridge the particles together. Moreover, the abundant hydrophilic groups (-OH, –COOH) in PTB substantially enhanced the water-holding capacity of green pellets, resulting in a reduced rate of drying dehydration and an elevated shock temperature. This comprehensive study provides valuable scientific insights into the development and application of composite binders. |
| first_indexed | 2024-03-07T23:23:06Z |
| format | Article |
| id | doaj.art-a2ad2c39b66c433b902d86f177eaad6a |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-07T23:23:06Z |
| publishDate | 2023-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-a2ad2c39b66c433b902d86f177eaad6a2024-02-21T05:28:05ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012769006911A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanismsYonghe Ma0Qian Li1Yan Zhang2Yongbin Yang3Yinhua Tang4Tao Jiang5School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China; Corresponding author.School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, ChinaXinyu Iron and Steel Co., Ltd., Xinyu, Jiangxi 338013, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, ChinaThe decrease in the total iron grade of pellets due to bentonite has prompted the search for a non-polluting and alternative binder. While organic binders are considered potential substitutes for bentonite, they cannot fully replace it due to complete decomposition and failure during pellet hardening. Thus, the production of pellets utilizing a composite of organic binder and bentonite has gained significant attention in academia and industry. In this study, a novel polymer-type binder (PTB) was introduced to minimize bentonite consumption during green pellet preparation. By regulating the ratio, the addition of just 0.01% PTB can reduce bentonite usage by 1.0% under optimal conditions, all while maintaining excellent pellet quality. Further investigations revealed that PTB molecules adsorbed on the surfaces of iron concentrate (predominantly magnetite) and bentonite through hydrogen bonding, electrostatic repulsion, coordination, monodentate chelation and surface complexation, and dissolved into a fibrous structure to bridge the particles together. Moreover, the abundant hydrophilic groups (-OH, –COOH) in PTB substantially enhanced the water-holding capacity of green pellets, resulting in a reduced rate of drying dehydration and an elevated shock temperature. This comprehensive study provides valuable scientific insights into the development and application of composite binders.http://www.sciencedirect.com/science/article/pii/S2238785423029071Polymer-type binderBentoniteIron ore pelletizingAdsorption |
| spellingShingle | Yonghe Ma Qian Li Yan Zhang Yongbin Yang Yinhua Tang Tao Jiang A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms Journal of Materials Research and Technology Polymer-type binder Bentonite Iron ore pelletizing Adsorption |
| title | A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms |
| title_full | A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms |
| title_fullStr | A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms |
| title_full_unstemmed | A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms |
| title_short | A novel polymer-type binder to decrease bentonite dosage during iron ore pelletizing: Performance and mechanisms |
| title_sort | novel polymer type binder to decrease bentonite dosage during iron ore pelletizing performance and mechanisms |
| topic | Polymer-type binder Bentonite Iron ore pelletizing Adsorption |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423029071 |
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