Flotation of coarse coal particles in a three-phase gas-solid-liquid fluidised bed

Wang Dongdong; Wang Huaifa

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Flotation of coarse coal particles in a three-phase gas-solid-liquid fluidised bed

机译：三相气体 - 固液流化床中粗煤颗粒的浮选

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摘要

The role of bubble and flotation reagents in the recovery of coal particles in three-phase gas-solid-liquid fluidised beds is investigated in this study. The flow rate and flotation yield in the presence or absence of bubbles were determined. The effect of bubbles attached to lower density and larger coal particles experiencing fluidised bed flotation is also discussed and validated by captured images. It is found that upward bubbly flows can significantly decrease the superficial velocity of liquid required to keep particles suspended and facilitates the capture of particles by bubble. The presence of a flotation collector improves this process and a decreased superficial flow velocity creates a relative quiescent hydrodynamic condition that enhances coarse particle-bubble aggregation and weakens the detachment of coarse particles from bubbles. The results indicate that flotation in a three-phase fluidised bed is a promising method to improve coarse coal particle separation.

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来源
《International Journal of Oil, Gas and Coal Technology: IJOGCT》 |2018年第2期|共16页
作者
Wang Dongdong; Wang Huaifa;
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作者单位

Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

Taiyuan Univ Technol Coll Min Engn Taiyuan 030024 Shanxi Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类石油、天然气工业;
关键词
coarse coal particles; flotation; three-phase fluidised bed; upward bubbly flow; reagents;

机译：粗煤颗粒;浮选;三相流化床;向上气球;试剂;

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Flotation of coarse coal particles in a three-phase gas-solid-liquid fluidised bed

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