Slurry

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A slurry composed of glass beads in silicone oil flowing down an inclined plane

A slurry is a thin sloppy mud or cement or, in extended use, any fluid mixture of a pulverized solid with a liquid (usually water), often used as a convenient way of handling solids in bulk.[1] Slurries behave in some ways like thick fluids, flowing under gravity but are also capable of being pumped if not too thick.

Examples

Examples of slurries include:

  • Cement slurry, a mixture of cement, water, and assorted dry and liquid additives used in the petroleum and other industries[2][3]
  • Soil/cement slurry, also called Controlled Low-Strength Material (CLSM), flowable fill, controlled density fill, flowable mortar, plastic soil-cement, K-Krete, and other names[4]
  • A mixture of thickening agent, oxidizers, and water used to form a gel explosive{{ safesubst:#invoke:Unsubst||date=__DATE__ |$B=

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Calculations

Determining solids fraction

To determine the percent solids (or solids fraction) of a slurry from the density of the slurry, solids and liquid[7]

where

is the solids fraction of the slurry (state by mass)
is the solids density
is the slurry density
is the liquid density

In aqueous slurries, as is common in mineral processing, the specific gravity of the species is typically used, and since is taken to be 1, this relation is typically written:

even though specific gravity with units tonnes/m^3 (t/m^3) is used instead of the SI density unit, kg/m^3.

Liquid mass from mass fraction of solids

To determine the mass of liquid in a sample given the mass of solids and the mass fraction: By definition

*100

therefore

and

then

and therefore

where

is the solids fraction of the slurry
is the mass or mass flow of solids in the sample or stream
is the mass or mass flow of slurry in the sample or stream
is the mass or mass flow of liquid in the sample or stream

Volumetric fraction from mass fraction

Equivalently

and in a minerals processing context where the specific gravity of the liquid (water) is taken to be one:

So

and

Then combining with the first equation:

So

Then since

we conclude that

where

is the solids fraction of the slurry on a volumetric basis
is the solids fraction of the slurry on a mass basis
is the mass or mass flow of solids in the sample or stream
is the mass or mass flow of slurry in the sample or stream
is the mass or mass flow of liquid in the sample or stream
is the bulk specific gravity of the solids

See also

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References

  1. Oxford English Dictionary 2nd ed.: Slurry
  2. Shlumberger: Oilfield glossary
  3. Rheonova : Measuring rheological propertis of settling slurries
  4. Portland Cement Association: Controlled Low-Strength Material
  5. Red Valve Company: Coal Slurry Pipeline
  6. Rheonova : Measuring food bolus properties
  7. Wills, B.A. and Napier-Munn, T.J, Wills' Mineral Processing Technology: an introduction to the practical aspects of ore treatment and mineral recovery, ISBN 978-0-7506-4450-1, Seventh Edition (2006), Elsevier, Great Britain

External links

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