High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage
The natural flake graphite (GO) with an initial fixed carbon content of 6.23% is purified using flotation combined with alkali-melting acid leaching to obtain the high purity graphite (PG3) for energy storage. The graphite concentrate (PG1) with fixed carbon content of 85.62% is obtained by the sele...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422017069 |
| _version_ | 1811293197700169728 |
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| author | Saidan Zhao Song Cheng Baolin Xing Mingjie Ma Changliang Shi Gan Cheng Weibo Meng Chuanxiang Zhang |
| author_facet | Saidan Zhao Song Cheng Baolin Xing Mingjie Ma Changliang Shi Gan Cheng Weibo Meng Chuanxiang Zhang |
| author_sort | Saidan Zhao |
| collection | DOAJ |
| description | The natural flake graphite (GO) with an initial fixed carbon content of 6.23% is purified using flotation combined with alkali-melting acid leaching to obtain the high purity graphite (PG3) for energy storage. The graphite concentrate (PG1) with fixed carbon content of 85.62% is obtained by the selective enrichment of GO particles based on the multi-stage flotation. The alkali-melting acid leaching purification method is used to further purify the PG1 to obtain the PG3 with the fixed carbon content of 99.93%. The fixed carbon content is increased by 93.7% through flotation combined with alkali solution and acid leaching. The purification process of GO is systematically evaluated and analyzed by the several characterization techniques. The impurities removal mechanisms are also analyzed, which indicates that silicate and quartz in GO react with sodium hydroxide to form soluble substances, resulted in impurities removal. Oxide in GO and hydroxide formed in the alkali-melting process are subsequently removed in acid leaching process. The obtained PG3 could be used in lithium ion battery with a higher reversible capacity of 387 mAh g−1 compared to the 345 mAh g−1 of commercial layered graphite, which has promising potential application in energy storage. The above analysis indicates that the low purity GO is converted into high purify PG3 for energy storage, realizing high quality utilization of GO. |
| first_indexed | 2024-04-13T04:57:59Z |
| format | Article |
| id | doaj.art-49972b505418487bb0cd2b5ad49b0041 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-13T04:57:59Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-49972b505418487bb0cd2b5ad49b00412022-12-22T03:01:25ZengElsevierJournal of Materials Research and Technology2238-78542022-11-012142124223High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storageSaidan Zhao0Song Cheng1Baolin Xing2Mingjie Ma3Changliang Shi4Gan Cheng5Weibo Meng6Chuanxiang Zhang7Henan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China; Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, 454003, China; Corresponding author.Henan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China; Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, 454003, China; Corresponding author.Henan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China; Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, 454003, ChinaThe natural flake graphite (GO) with an initial fixed carbon content of 6.23% is purified using flotation combined with alkali-melting acid leaching to obtain the high purity graphite (PG3) for energy storage. The graphite concentrate (PG1) with fixed carbon content of 85.62% is obtained by the selective enrichment of GO particles based on the multi-stage flotation. The alkali-melting acid leaching purification method is used to further purify the PG1 to obtain the PG3 with the fixed carbon content of 99.93%. The fixed carbon content is increased by 93.7% through flotation combined with alkali solution and acid leaching. The purification process of GO is systematically evaluated and analyzed by the several characterization techniques. The impurities removal mechanisms are also analyzed, which indicates that silicate and quartz in GO react with sodium hydroxide to form soluble substances, resulted in impurities removal. Oxide in GO and hydroxide formed in the alkali-melting process are subsequently removed in acid leaching process. The obtained PG3 could be used in lithium ion battery with a higher reversible capacity of 387 mAh g−1 compared to the 345 mAh g−1 of commercial layered graphite, which has promising potential application in energy storage. The above analysis indicates that the low purity GO is converted into high purify PG3 for energy storage, realizing high quality utilization of GO.http://www.sciencedirect.com/science/article/pii/S2238785422017069Natural flake graphiteFlotationAlkali-meltingAcid leachingEnergy storage |
| spellingShingle | Saidan Zhao Song Cheng Baolin Xing Mingjie Ma Changliang Shi Gan Cheng Weibo Meng Chuanxiang Zhang High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage Journal of Materials Research and Technology Natural flake graphite Flotation Alkali-melting Acid leaching Energy storage |
| title | High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage |
| title_full | High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage |
| title_fullStr | High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage |
| title_full_unstemmed | High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage |
| title_short | High efficiency purification of natural flake graphite by flotation combined with alkali-melting acid leaching: application in energy storage |
| title_sort | high efficiency purification of natural flake graphite by flotation combined with alkali melting acid leaching application in energy storage |
| topic | Natural flake graphite Flotation Alkali-melting Acid leaching Energy storage |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422017069 |
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