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Open AccessArticle

Enhanced Bauxite Recovery Using a Flotation Column Packed with Multilayers of Medium

by Pengyu Zhang 1,2, Wencai Zhang 3,*, Leming Ou 1,2,*, Yuteng Zhu 1,2 and Zicheng Zhu 1,2
1
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
2
Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources, Central South University, Changsha 410083, China
3
Department of Mining and Minerals Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(7), 594; https://doi.org/10.3390/min10070594
Received: 18 June 2020 / Revised: 26 June 2020 / Accepted: 27 June 2020 / Published: 30 June 2020
An innovative self-designed medium was packed in a bench-scale flotation column to study its influence on the flotation recovery of bauxite. Computational fluid dynamics (CFD) simulation was conducted to reveal the impact of the packing medium on the turbulent characteristics of collection zone in the column. Simulation results show that multilayer packing of the medium divides the collection zone into small units having different turbulent intensities, which is more suitable for flotation separation. The packing medium decreases the turbulence kinetic energy (from 1.08 × 10−2 m2/s2 to 2.1 × 10−3 m2/s2), turbulence eddy dissipation (from 3.71 × 10−2 m2/s3 to 9.8 × 10−3 m2/s3) and axial fluid velocity of fluid in the column. With three layers of packing, the recovery of Al2O3 increased by 2.11% and the aluminum to silicon content ratio of the concentrate improved from 5.16 to 9.72.
Keywords: flotation column; multilayer packing; bauxite; CFD flotation column; multilayer packing; bauxite; CFD
MDPI and ACS Style

Zhang, P.; Zhang, W.; Ou, L.; Zhu, Y.; Zhu, Z. Enhanced Bauxite Recovery Using a Flotation Column Packed with Multilayers of Medium. Minerals 2020, 10, 594.

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