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| Flotation process optimization and separation mechanism of refractory "nodular" graphite ore |
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Received:August 09, 2025
Revised:September 08, 2025
Accepted:October 21, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2025.05.006 |
| KeyWord:refractory graphite ore;nodular structure;flotation;regrinding process;flake protection |
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| 1.Suzhou SINOMA Design & Research Institute of Non-metallic Minerals Industry Co. Ltd., Suzhou 215000, Jiangsu, China;2.National Engineering Research Center for Further Processing of Non-metallic Minerals, Suzhou 215000, Jiangsu, China |
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| Abstract: |
| Graphite, as a strategic resource, requires highly efficient separation to meet industrial application demands. Focusing on the characteristics of a refractory graphite ore from a specific region, where graphite occurs in "nodular" aggregates with complex gangue mineral dissemination, this study conducted systematic flotation process optimization to enhance the fixed carbon content and recovery rate of the concentrate. The experimental process consisted of rough grinding and roughing, followed by multiple stages of regrinding and cleaning of the rough concentrate. Key parameters, including grinding method, regrinding duration, and middlings treatment, were investigated for their effects on fixed carbon content and recovery. The results indicate that the optimal rougher conditions are a grinding fineness of 47.12% passing ?150 μm, a diesel collector dosage of 125 g·t?1, and a pine oil frother dosage of 100 g·t?1. After three stages of ball mill regrinding, two stages of sand mill regrinding, and seven cleaning stages of the rough concentrate, the final concentrate achieved a fixed carbon content of 94.14%, a recovery rate of 94.15%, and a yield of 6.69%. This process flow not only delivers stable technical indicators but also provides crucial technical support for the efficient exploitation of similar refractory graphite ores. |
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