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Mechanism of micro/nano-bubble formation and cavitation effect on bubbles size distribution in flotation

Deng Xiaowei, Lv Bo, Cheng Gan, Lu Yang

Physicochemical Problems of Mineral Processing

2020

Vol. 56, iss. 3

504--512

In this study, micro/nano-bubble generated by cavitation effect as a promoting factor for flotation was investigated using the atomic force microscope (AFM). Hydrodynamic cavitation tests were performed with a venturi bubble generator. Additionally, bubble size distribution (BSD) under the hydrodynamic cavitation effect was also studied at different water flow speed conditions. Dozens of nanometers height bubbles attached to the hydrophobic substrates were detected. Besides, the cavitation cloud grew thicker with the flow velocity increasing from 26.52 m/sec to 53.04 m/sec, near the venturi tube nozzle. All results showed the importance of the cavitation effect on the micro/nano-bubbles formation and the BSD in flotation.

Fluidization characteristics and separation performance of mild-hot gas-solid fluidized bed

Lv Bo, Luo Zhenfu, Zhang Bo, Zhao Yuemin, Qin Yunfei

Physicochemical Problems of Mineral Processing

2019

Vol. 55, iss. 1

184--195

In recent years, the mild-hot gas-solid fluidized bed had a crucial influence on wet-in-feed sorting when it comes to moist feed (e.g., lignite) because of its expanding sorting range. To explain the favorable sorting effect of the mild-hot gas-solid fluidized bed, the fluidization characteristics (e.g., the pressure drop, density, etc.) was studied under different work conditions. In addition, a high-speed dynamic camera was used in this study to compare the slumping behavior of the magnetite slag at different temperatures. The optimum conditions for coal separation was also studied by Design-Expert software. It was shown that the bed temperature of the fluidized bed has a particular effect on its stability when the bed temperature was below 120 °C, which had a great influence on the separation. Finally, the probable deviation E of the mild-hot gas-solid fluidized bed under optimum operation conditions could be as low as 0.09 g/cm3 which showed the good separation ability.