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Minerals 2018, 8(1), 15; https://doi.org/10.3390/min8010015

Multi-Stage Flotation for the Removal of Ash from Fine Graphite Using Mechanical and Centrifugal Forces

1
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
2
Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China
3
Bakuang Coal Preparation Plant, Pingdingshan Shenma Group Coal Industry Co., Ltd., Pingdingshan 467000, China
*
Authors to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 7 January 2018 / Accepted: 10 January 2018 / Published: 11 January 2018
(This article belongs to the Special Issue Flotation Chemistry)
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Abstract

Graphite ore collected from Hunan province, south China was characterized by chemical analysis, X-ray diffraction, and optical microscopy. Rougher and multi-stage flotation tests using a mechanical flotation cell and a flotation column containing an additional centrifugal force field were carried out to promote its grade and economic value. In rougher flotation, both the mechanical flotation cell and flotation column reduced the ash content of the graphite ore from 15.43% to 10.8%, while the yield of the flotation column (91.41%) was much higher than that of the mechanical flotation cell (50%). In the presence of hydrophobic graphite, the seriously entrained gangue restricted further improvement in the quality and economic value of the graphite ore. Therefore, multi-stage flotation circuits were employed to diminish this entrainment. Multi-stage flotation circuits using the two flotation devices further decreased the ash content of the graphite ore to ~8%, while the yield when using the flotation column was much higher than that obtained from the mechanical flotation cell employed. On the other hand, the ash removal efficiency of the flotation column was 3.82-fold higher than that observed for the mechanical flotation cell. The Cleaner 3 flotation circuit using the flotation column decreased the ash content in graphite from 15.43% to 7.97% with a yield of 77.53%. View Full-Text
Keywords: mechanical flotation; column flotation; centrifugal force; multi-stage circuit mechanical flotation; column flotation; centrifugal force; multi-stage circuit
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bu, X.; Zhang, T.; Peng, Y.; Xie, G.; Wu, E. Multi-Stage Flotation for the Removal of Ash from Fine Graphite Using Mechanical and Centrifugal Forces. Minerals 2018, 8, 15.

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