Flotation of coarse coal particles in a three-phase gas-solid-liquid fluidised bed
by Dongdong Wang; Huaifa Wang
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 17, No. 2, 2018

Abstract: 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. [Received: May 23, 2016; Accepted: February 13, 2017]

Online publication date: Fri, 26-Jan-2018

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Oil, Gas and Coal Technology (IJOGCT):
Login with your Inderscience username and password:

    Username:        Password:         

Forgotten your password?


Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com