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Original Articles

Surface Potential of Coal Particles in Coal-Oil Mixture and Control of Settling Stability Under Gravity

, , , &
Pages 989-994 | Received 31 Mar 2010, Accepted 26 Apr 2010, Published online: 27 Jun 2011
 

Abstract

This work deals with the problem of settling under gravity for coal-oil mixtures when the concentration of particles is large. The repulsive force necessary to ensure stability of coal particle is vital. The net forces acting on the particle include gravity, buoyancy, viscous drag force, and electrostatic repulsive force. Accordingly, the equation at the terminal velocity at settling is obtained along with a critical surface potential to prevent settling under gravity.

Acknowledgements

The financial support received from SINOPEC (No. 108106) is greatly appreciated.

Notes

a Average value of 5 samples approximately equals to 39 mv.

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