Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics
The aluminum electrolysis industry continually and unavoidably produces hazardous solid waste in the form of carbon anode slag. Carbon anode slag poses a serious environmental pollution risk, and it must be disposed of in a harmless manner. On the other hand, it contains a few valuable resources, as...
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/2297-8739/10/3/193 |
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| author | Jiawei Zheng Song Wang Xuexia Wang Muhammad Bilal Zhiming Zhang Sijie Yang Changkai Jing Guangqian Xu Chao Ni |
| author_facet | Jiawei Zheng Song Wang Xuexia Wang Muhammad Bilal Zhiming Zhang Sijie Yang Changkai Jing Guangqian Xu Chao Ni |
| author_sort | Jiawei Zheng |
| collection | DOAJ |
| description | The aluminum electrolysis industry continually and unavoidably produces hazardous solid waste in the form of carbon anode slag. Carbon anode slag poses a serious environmental pollution risk, and it must be disposed of in a harmless manner. On the other hand, it contains a few valuable resources, as well. In order for the aluminum electrolysis industry to develop in an environmentally friendly and high-quality manner, the harmless disposal of carbon anode slag and its resourceful utilization are of considerable importance. The selective comminution of carbon and cryolite particles in carbon anode slag can be effectively achieved with grinding pretreatment. However, the optimization study of grinding process parameters has yet to be investigated. Therefore, firstly, the mineralogical characteristics and existing mode of carbon anode slag from the perspective of mineralogical properties are analyzed in this study. Then, the effects of grinding time, grinding concentration, and steel ball diameter on the particle size of the ground product (γ<sub>−0.074 mm</sub>) are investigated using response surface analysis. The results showed that the effect of grinding time was the most significant, followed by grinding concentration and steel ball diameter. In addition, the performance of the multi-stage flotation process for separating the −0.074 mm ground product was analyzed. Cryolite with a purity of 93.12% and a carbon product with an ash content of 10.67% could be simultaneously obtained through multi-stage flotation. It should be pointed out that the deep dissociation and efficient recovery of fine undissociated particles still need to be further explored. |
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| institution | Directory Open Access Journal |
| issn | 2297-8739 |
| language | English |
| last_indexed | 2024-03-11T05:55:53Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
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| series | Separations |
| spelling | doaj.art-fd2e47391d8c453292fdb7d5de8dbf6b2023-11-17T13:50:20ZengMDPI AGSeparations2297-87392023-03-0110319310.3390/separations10030193Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical CharacteristicsJiawei Zheng0Song Wang1Xuexia Wang2Muhammad Bilal3Zhiming Zhang4Sijie Yang5Changkai Jing6Guangqian Xu7Chao Ni8School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaDepartment of Mining Engineering, Shanxi Institute of Technology, Yangquan 045000, ChinaDepartment of Mining Engineering, Balochistan University of Information Technology, Engineering and Management Sciences (BUITEMS), Quetta 87300, PakistanSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaThe aluminum electrolysis industry continually and unavoidably produces hazardous solid waste in the form of carbon anode slag. Carbon anode slag poses a serious environmental pollution risk, and it must be disposed of in a harmless manner. On the other hand, it contains a few valuable resources, as well. In order for the aluminum electrolysis industry to develop in an environmentally friendly and high-quality manner, the harmless disposal of carbon anode slag and its resourceful utilization are of considerable importance. The selective comminution of carbon and cryolite particles in carbon anode slag can be effectively achieved with grinding pretreatment. However, the optimization study of grinding process parameters has yet to be investigated. Therefore, firstly, the mineralogical characteristics and existing mode of carbon anode slag from the perspective of mineralogical properties are analyzed in this study. Then, the effects of grinding time, grinding concentration, and steel ball diameter on the particle size of the ground product (γ<sub>−0.074 mm</sub>) are investigated using response surface analysis. The results showed that the effect of grinding time was the most significant, followed by grinding concentration and steel ball diameter. In addition, the performance of the multi-stage flotation process for separating the −0.074 mm ground product was analyzed. Cryolite with a purity of 93.12% and a carbon product with an ash content of 10.67% could be simultaneously obtained through multi-stage flotation. It should be pointed out that the deep dissociation and efficient recovery of fine undissociated particles still need to be further explored.https://www.mdpi.com/2297-8739/10/3/193carbon anode slagmineralogical characteristicsresponse surface designgrindingflotation |
| spellingShingle | Jiawei Zheng Song Wang Xuexia Wang Muhammad Bilal Zhiming Zhang Sijie Yang Changkai Jing Guangqian Xu Chao Ni Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics Separations carbon anode slag mineralogical characteristics response surface design grinding flotation |
| title | Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics |
| title_full | Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics |
| title_fullStr | Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics |
| title_full_unstemmed | Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics |
| title_short | Recovery of Carbon and Cryolite from Spent Carbon Anode Slag Using a Grinding Flotation Process Based on Mineralogical Characteristics |
| title_sort | recovery of carbon and cryolite from spent carbon anode slag using a grinding flotation process based on mineralogical characteristics |
| topic | carbon anode slag mineralogical characteristics response surface design grinding flotation |
| url | https://www.mdpi.com/2297-8739/10/3/193 |
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