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Tailings and Mine Waste Conference
A two-layer approach for tailings in open channels Abulnaga, Baha E.
Abstract
In a number of locations around the world the tailings storage area is sufficiently lower than the mineral processing plant to allow disposal by gravity. Most past efforts to represent open channel flows have been empirical and have focused on representing the solid phase as a viscosity problem for which the Manning equation could be used. Empirical equations developed for stormwater flows are difficult to use for tailings as they were often developed for cases of solids that do not exceed few thousand parts per million. As large tailings systems develop to transport solids with volumetric concentration in the range of 20% to 30% different forces interact. The coarsest particles move as a bed load in the bottom layer, while the fines move in a suspended mode in the upper layer. Bed forms develop at the interface between the two layers that include ripples, dunes, anti-dunes and flat planes. With large volumes of solids, a Coulombic force develops that is independent of speed but must be accounted for in friction losses while collisions between particles give rise to the Bagnold stress. The proposed two-layer approach provides a tool to examine the combination of these forces for design of long distance tailings transport in open channels. [All papers were considered for technical and language appropriateness by the organizing committee.]
Item Metadata
Title |
A two-layer approach for tailings in open channels
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Creator | |
Contributor | |
Date Issued |
2011-11
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Description |
In a number of locations around the world the tailings storage area is sufficiently lower than the mineral
processing plant to allow disposal by gravity. Most past efforts to represent open channel flows have been
empirical and have focused on representing the solid phase as a viscosity problem for which the Manning
equation could be used. Empirical equations developed for stormwater flows are difficult to use for tailings as
they were often developed for cases of solids that do not exceed few thousand parts per million.
As large tailings systems develop to transport solids with volumetric concentration in the range of 20% to 30%
different forces interact. The coarsest particles move as a bed load in the bottom layer, while the fines move in a
suspended mode in the upper layer. Bed forms develop at the interface between the two layers that include
ripples, dunes, anti-dunes and flat planes. With large volumes of solids, a Coulombic force develops that is
independent of speed but must be accounted for in friction losses while collisions between particles give rise to
the Bagnold stress. The proposed two-layer approach provides a tool to examine the combination of these
forces for design of long distance tailings transport in open channels.
[All papers were considered for technical and language appropriateness by the organizing committee.]
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-10-07
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0107690
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Other
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International