Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching
This study examines the acid-leaching and purification process of waste graphite in the production of Czochralski monocrystalline silicon. The optimal leaching conditions are identified as a liquid-to-solid ratio of 6, a leaching temperature of 70 °C, an acid concentration of 8 mol, and a leaching t...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Arabian Journal of Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1878535224004532 |
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| author | Yonghang Zhang Zhengjie Chen Keqiang Xie Xiuhua Chen Xiaowei Chen Yiyou Hu Wenhui Ma |
| author_facet | Yonghang Zhang Zhengjie Chen Keqiang Xie Xiuhua Chen Xiaowei Chen Yiyou Hu Wenhui Ma |
| author_sort | Yonghang Zhang |
| collection | DOAJ |
| description | This study examines the acid-leaching and purification process of waste graphite in the production of Czochralski monocrystalline silicon. The optimal leaching conditions are identified as a liquid-to-solid ratio of 6, a leaching temperature of 70 °C, an acid concentration of 8 mol, and a leaching time of 60 min. The use of hydrofluoric acid, sulfuric acid, and nitric acid in the acid-leaching process increases the fixed carbon content of waste graphite from ∼94 % to ∼98.5 %. To address the low fixed carbon content that cannot be achieved through conventional acid-leaching, a method combining ultrasonic intensification with hydrofluoric and hydrochloric acid leaching is proposed and successfully implemented. Under ultrasonic enhancement conditions, the leaching effect is optimal at a temperature of 60 °C, acidity of 4 mol, and leaching time of 60 min. These results demonstrate that the introduction of ultrasound significantly strengthens the acid-leaching process. The method proposed in this study not only purifies waste graphite through acid-leaching but also elucidates the reaction behavior of various impurity elements during the leaching process. Overall, these findings provide a foundational basis for the recovery of waste graphite in the thermal field. |
| format | Article |
| id | doaj-art-d5e8f3a1e1074661a61bbfc00c02024d |
| institution | Kabale University |
| issn | 1878-5352 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Arabian Journal of Chemistry |
| spelling | doaj-art-d5e8f3a1e1074661a61bbfc00c02024d2024-11-18T04:32:47ZengElsevierArabian Journal of Chemistry1878-53522024-12-011712106051Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leachingYonghang Zhang0Zhengjie Chen1Keqiang Xie2Xiuhua Chen3Xiaowei Chen4Yiyou Hu5Wenhui Ma6Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China; National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China; Corresponding author at: Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China; National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, ChinaSchool of Materials and Energy, Yunnan University, Kunming 650091, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China; National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, ChinaThis study examines the acid-leaching and purification process of waste graphite in the production of Czochralski monocrystalline silicon. The optimal leaching conditions are identified as a liquid-to-solid ratio of 6, a leaching temperature of 70 °C, an acid concentration of 8 mol, and a leaching time of 60 min. The use of hydrofluoric acid, sulfuric acid, and nitric acid in the acid-leaching process increases the fixed carbon content of waste graphite from ∼94 % to ∼98.5 %. To address the low fixed carbon content that cannot be achieved through conventional acid-leaching, a method combining ultrasonic intensification with hydrofluoric and hydrochloric acid leaching is proposed and successfully implemented. Under ultrasonic enhancement conditions, the leaching effect is optimal at a temperature of 60 °C, acidity of 4 mol, and leaching time of 60 min. These results demonstrate that the introduction of ultrasound significantly strengthens the acid-leaching process. The method proposed in this study not only purifies waste graphite through acid-leaching but also elucidates the reaction behavior of various impurity elements during the leaching process. Overall, these findings provide a foundational basis for the recovery of waste graphite in the thermal field.http://www.sciencedirect.com/science/article/pii/S1878535224004532Acid leachingGraphitePurificationUltrasonic strengthening |
| spellingShingle | Yonghang Zhang Zhengjie Chen Keqiang Xie Xiuhua Chen Xiaowei Chen Yiyou Hu Wenhui Ma Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching Arabian Journal of Chemistry Acid leaching Graphite Purification Ultrasonic strengthening |
| title | Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching |
| title_full | Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching |
| title_fullStr | Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching |
| title_full_unstemmed | Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching |
| title_short | Study on the thermal field material of FZ-Si crystal waste graphite purified by ultrasonic enhanced acid leaching |
| title_sort | study on the thermal field material of fz si crystal waste graphite purified by ultrasonic enhanced acid leaching |
| topic | Acid leaching Graphite Purification Ultrasonic strengthening |
| url | http://www.sciencedirect.com/science/article/pii/S1878535224004532 |
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